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index 63de68a..88fde82 100644
--- "a/54.\346\267\261\345\272\246\350\247\243\345\257\206\350\231\232\346\213\237\346\234\272\347\232\204\346\211\247\350\241\214\347\216\257\345\242\203\357\274\232\346\240\210\345\270\247\345\257\271\350\261\241.html"
+++ "b/54.\346\267\261\345\272\246\350\247\243\345\257\206\350\231\232\346\213\237\346\234\272\347\232\204\346\211\247\350\241\214\347\216\257\345\242\203\357\274\232\346\240\210\345\270\247\345\257\271\350\261\241.html"
@@ -387,25 +387,12 @@ <h2 id="栈帧的底层结构"><a class="header" href="#栈帧的底层结构">
 </code></pre>
 <p>我们是在第 4 行获取的栈帧，所以打印结果是 4。</p>
 <p><font color="darkblue"><strong>int f_iblock</strong></font></p>
-<p>用于跟踪 try / except / finally 代码块的层级深度，它记录了当前栈帧中活跃的 try 语句块的数量，每进入一个新的 try 语句块时加 1，离开 try 语句块时减 1。</p>
-<pre><code class="language-Python">try:           # f_iblock = 1
-    try:       # f_iblock = 2
-        pass
-    except:
-        pass   
-except:        # f_iblock = 1
-    pass
-finally:       # f_iblock = 0
-    pass
-</code></pre>
-<p>f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。</p>
+<p>用于跟踪 try / except / finally 代码块的层级深度。具体等介绍异常捕获的时候再说，总之 f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。</p>
 <p><font color="darkblue"><strong>char f_executing</strong></font></p>
 <p>当前栈帧是否仍在执行。</p>
 <p><font color="darkblue"><strong>PyTryBlock f_blockstack[CO_MAXBLOCKS]</strong></font></p>
 <p>一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？</p>
 <ul>
-<li>SETUP_LOOP：循环块（for / while）</li>
-<li>SETUP_EXCEPT：try / except 块</li>
 <li>SETUP_FINALLY：try / finally 块</li>
 <li>SETUP_WITH：with 语句块</li>
 <li>SETUP_ASYNC_WITH：async with 语句块</li>
diff --git a/images/205.png b/images/205.png
new file mode 100644
index 0000000..7394a1a
Binary files /dev/null and b/images/205.png differ
diff --git a/images/206.png b/images/206.png
new file mode 100644
index 0000000..0443696
Binary files /dev/null and b/images/206.png differ
diff --git a/images/207.png b/images/207.png
new file mode 100644
index 0000000..b8e6fac
Binary files /dev/null and b/images/207.png differ
diff --git a/print.html b/print.html
index b215782..0006942 100644
--- a/print.html
+++ b/print.html
@@ -14345,25 +14345,12 @@ <h2 id="栈帧的底层结构"><a class="header" href="#栈帧的底层结构">
 </code></pre>
 <p>我们是在第 4 行获取的栈帧，所以打印结果是 4。</p>
 <p><font color="darkblue"><strong>int f_iblock</strong></font></p>
-<p>用于跟踪 try / except / finally 代码块的层级深度，它记录了当前栈帧中活跃的 try 语句块的数量，每进入一个新的 try 语句块时加 1，离开 try 语句块时减 1。</p>
-<pre><code class="language-Python">try:           # f_iblock = 1
-    try:       # f_iblock = 2
-        pass
-    except:
-        pass   
-except:        # f_iblock = 1
-    pass
-finally:       # f_iblock = 0
-    pass
-</code></pre>
-<p>f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。</p>
+<p>用于跟踪 try / except / finally 代码块的层级深度。具体等介绍异常捕获的时候再说，总之 f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。</p>
 <p><font color="darkblue"><strong>char f_executing</strong></font></p>
 <p>当前栈帧是否仍在执行。</p>
 <p><font color="darkblue"><strong>PyTryBlock f_blockstack[CO_MAXBLOCKS]</strong></font></p>
 <p>一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？</p>
 <ul>
-<li>SETUP_LOOP：循环块（for / while）</li>
-<li>SETUP_EXCEPT：try / except 块</li>
 <li>SETUP_FINALLY：try / finally 块</li>
 <li>SETUP_WITH：with 语句块</li>
 <li>SETUP_ASYNC_WITH：async with 语句块</li>
diff --git a/searchindex.js b/searchindex.js
index 1132f57..3108bd8 100644
--- a/searchindex.js
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@@ -1 +1 @@
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Python 编写，然后放在 Lib 目录下面。 Modules 目录 Python 的内置库，这些库都是用 C 编写的，编译之后会内嵌在解释器里面。我们举个例子： import random, _random\nimport re, _sre\nimport io, _io\nimport ast, _ast 以 random 为例，它是用来生成随机数的，和性能密切相关。所以它的核心功能由 C 编写，编译之后内嵌在解释器里，模块名为 _random。只不过 Python 又封装了一个 random，在内部会导入 _random，像 re 和 _sre、asyncio 和 _asyncio 都是类似的关系。 Modules 目录里面实现了大量和性能相关的模块，比如 sys、time、gc 等等，我们后续再聊。 Objects 目录 包含 Python 内置数据结构的底层实现，像字典、列表、元组、函数等，底层实现都定义在 Objects 目录中。 Parser 目录 负责 Python 代码的编译，虽然 Python 是解释型语言，但也是要经过编译的。编译的结果为 PyCodeObject 对象，它里面包含了要执行的字节码，编译完之后会交给虚拟机执行。 所以 Python 解释器 = Python 编译器 + Python 虚拟机。 Python 目录 Python 虚拟机的具体实现，字节码的执行、执行环境的管理等都在里面。 Mac 目录 用于 Mac OS X 平台的特定工具和脚本。 Misc 目录 包含各种杂项文件，如配置脚本、工具等。 PC 目录 专为 Windows 平台编写的配置文件和特定扩展。 PCbuild 目录 用于在 Windows 上编译 Python 的项目文件。 Programs 目录 包含 Python 其它可执行文件（如 IDLE）的源代码。 Tools 目录 包含用 Python 编写的各种脚本和工具，帮助开发和维护 Python。 以上就是 CPython 的源码结构，对它有一个基本的认识有助于我们后续的源码学习。","breadcrumbs":"1. CPython 源码长什么样子？ » CPython 源码结构","id":"1","title":"CPython 源码结构"},"10":{"body":"不可变对象一旦创建，其内存中存储的值就不可以再修改了。如果想修改，只能创建一个新的对象，然后让变量指向新的对象，所以前后的地址会发生改变。而可变对象在创建之后，其存储的值可以动态修改。 像整数就是一个不可变对象。 >>> a = 666\n>>> id(a)\n140176818069136\n>>> a += 1\n>>> id(a)\n140176818068368 我们看到执行 a += 1 操作之后，前后地址发生了变化，所以整数不支持本地修改，因此是一个不可变对象； 原来 a = 666，而我们说操作一个变量等于操作这个变量指向的内存，所以 a += 1 会将 a 指向的整数对象 666 和 1 进行加法运算，得到 667。因此会开辟新的空间来存储 667，然后让 a 指向这片新的空间。至于原来的 666 所占的空间怎么办，解释器会看它的引用计数，如果不为 0 代表还有变量引用（指向）它，如果为 0 则证明没有变量引用了，所以会被回收。 关于引用计数，我们后面会详细说，目前只需要知道，如果对象被变量引用了，那么该对象的引用计数就会加 1。有几个变量引用，那么它的引用计数就是几。 除了整数之外，浮点数、字符串、布尔值等等，都是不可变对象，它们的值不能本地修改。 然后是可变对象，像列表、字典、集合等都是可变对象，它们支持动态修改。 这里先多提一句，Python 对象本质上就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。Python 的任何对象在 C 中都会对应一个结构体，这个结构体除了存放具体的值之外，还存放了一些额外信息，具体细节在后续剖析内置对象的时候会细说。 在上一篇文章中我们说到，列表、元组、集合这些容器的内部存储的不是具体的对象，而是对象的指针。比如：lst = [1, 2, 3]，你以为列表存储的是三个整数对象吗？其实不是的，它存储的是三个整数对象的指针，当我们获取 lst[0] 的时候，拿到的是一个指针，但是操作（比如 print）的时候会自动操作指针指向的内存。 因为 Python 底层是用 C 实现的，所以列表的实现必然要借助 C 的数组。可 C 数组里面的元素的类型是一致的，但列表却可以存放任意的元素，因此从这个角度上讲，列表里面的元素就不可能是对象，因为不同的对象在底层对应的结构体是不同的，所以元素只能是指针。 可能有人又好奇了，不同对象的指针也是不同的啊，是的，但 C 指针是可以转化的。Python 底层将所有对象的指针，都转成了 PyObject 类型的指针，这样不就是同一种类型的指针了吗？关于这个 PyObject，它是我们后面要剖析的重中之重，贯穿了整个系列。不过目前只需要知道列表（还有其它容器）存储的元素、以及 Python 的变量，它们都是一个泛型指针 PyObject *。 >>> lst = [1, 2, 3]\n>>> id(lst)\n140176818170432\n>>> lst.append(4)\n>>> lst.append(5)\n>>> lst\n[1, 2, 3, 4, 5]\n>>> id(lst)\n140176818170432 我们看到列表在添加元素的时候，前后地址并没有改变。列表在 C 中是通过 PyListObject 结构体实现的，我们在介绍列表的时候会细说。这个 PyListObject 内部除了一些基本信息之外，还维护了一个 PyObject 的二级指针，指向了 PyObject * 类型的数组的首元素。 显然图中的指针数组用来存储具体的对象的指针，每一个指针都指向了相应的对象（这里是整数对象）。 然后我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了一个二级指针。显然添加、删除、修改元素等操作，都是通过这个二级指针来间接操作指针数组。 因为一个对象一旦被创建（任何语言都是如此），那么它在内存中的大小就不可以变了。所以这就意味着那些可以容纳可变长度数据的可变对象，要在内部维护一个指针，指针指向一片内存区域，该区域存放具体的数据。如果空间不够了，那就申请一片更大的内存区域，然后将元素依次拷贝过去，再让指针指向新的内存区域。而列表的底层也是这么做的，其内部并没有直接存储具体的指针数组，而是存储了指向指针数组首元素的二级指针。 那么问题来了，为什么要这么做？ 其实很好理解，遵循这样的规则可以使通过指针维护对象的工作变得非常简单。一旦允许对象的大小可在运行期改变，那么我们就要考虑如下场景。 在内存中有对象 A，并且其后面紧跟着对象 B。如果在运行的某个时候，A 的大小增大了，这就意味着必须将 A 整个移动到内存中的其他位置，否则 A 增大的部分会覆盖掉原本属于 B 的数据。但要将 A 移动到内存的其他位置，那么所有指向 A 的指针就必须立即得到更新。可想而知这样的工作是多么的繁琐，因此通过在可变对象的内部维护一个指针就变得简单多了。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 可变对象和不可变对象","id":"10","title":"可变对象和不可变对象"},"100":{"body":"根据解释器 API 的命名规则，bytes 类型在底层应该对应 PyBytes_Type。 // Objects/bytesobject.c\nPyTypeObject PyBytes_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bytes\", PyBytesObject_SIZE, sizeof(char), // ... &bytes_as_number, /* tp_as_number */ &bytes_as_sequence, /* tp_as_sequence */ &bytes_as_mapping, /* tp_as_mapping */ // ...\n}; 实例对象的大小信息保存在类型对象中，由 tp_basicsize 和 tp_itemsize 负责维护。 tp_basicsize：实例对象的基本大小，对于 bytes 对象来说就是 PyBytesObject_SIZE。 tp_itemsize：如果实例对象是变长对象，并且结构体本身还保存了具体的元素，那么该字段则表示每个元素的大小，否则为 0。对于 bytes 对象来说就是 sizeof(char)，即 1 字节。 其中 PyBytesObject_SIZE 是一个宏，等于 offsetof(PyBytesObject, ob_sval) + 1，也就是结构体的起始位置到 ob_sval 字段的偏移量再加 1。显然这个大小是固定不变的基础大小，那么它等于多少呢？ typedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 很明显，大小是 32 + 1 = 33 字节，然后再加上 sizeof(char) * ob_size 就是整个 bytes 对象的大小。由于 sizeof(char) 等于 1，所以 bytes 对象的大小等于 PyBytesObject_SIZE 加上 ob_size，我们后面介绍 bytes 对象的创建时会看到。 然后看一下方法簇，我们发现这三个方法簇 bytes 对象居然都支持。 // Objects/bytesobject.c static PyNumberMethods bytes_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ bytes_mod, /*nb_remainder*/\n}; static PySequenceMethods bytes_as_sequence = { // 计算长度，如 len(b\"abc\") (lenfunc)bytes_length, /*sq_length*/ // 将两个 bytes 对象相加 // 比如 b\"abc\" + b\"def\" (binaryfunc)bytes_concat, /*sq_concat*/ // 将 bytes 对象重复 N 次 // 比如 \"abc\" * 3 (ssizeargfunc)bytes_repeat, /*sq_repeat*/ // 基于索引获取 bytes 对象的指定元素 // 比如 b\"abc\"[1] (ssizeargfunc)bytes_item, /*sq_item*/ 0, /*sq_slice*/ 0, /*sq_ass_item*/ 0, /*sq_ass_slice*/ // 判断 bytes 对象是否包含某个元素 (objobjproc)bytes_contains /*sq_contains*/\n}; static PyMappingMethods bytes_as_mapping = { // 获取 bytes 对象的长度 (lenfunc)bytes_length, // 基于切片截取 bytes 对象 (binaryfunc)bytes_subscript, 0,\n}; 对于数值型操作，bytes 对象实现了 nb_remainder，它居然支持求余数，这是怎么回事？好吧，我表现的有些刻意了，其实就是一个字节串的格式化操作。 对于序列型操作，bytes 对象支持五个，从名字上看也知道是做什么的，不过这些我们一会儿都会说。 对于映射型操作，bytes 对象支持两个。虽然 bytes 对象不是字典，但解释器允许它做一些类似于映射的操作，这种设计使得 bytes 对象具有更加丰富和灵活的操作接口。 下面我们就来详细介绍这些操作的底层实现，它们都位于 Objects/bytesobject.c 中。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 类型","id":"100","title":"bytes 类型"},"101":{"body":"bytes 对象借用取模运算符 % 实现格式化，它对应 bytes_as_number->nb_remainder 字段，该字段被赋值为 bytes_mod。 static PyObject *\nbytes_mod(PyObject *self, PyObject *arg)\n{ if (!PyBytes_Check(self)) { Py_RETURN_NOTIMPLEMENTED; } // PyBytes_AS_STRING 会返回 PyBytesObject 的 ob_sval 字段 // PyBytes_GET_SIZE 会返回 PyBytesObject 的 ob_size 字段，即长度 // arg 是传递的参数，它是一个元组 return _PyBytes_FormatEx(PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self), arg, 0);\n} 最终会调用 _PyBytes_FormatEx 进行格式化，我们再以 Python 为例。 info = b\"name: %s, age: %d\"\nprint(info % (b\"satori\", 17)) # b'name: satori, age: 17' bytes 对象的格式化，在工作中其实用的不多。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 对象的格式化","id":"101","title":"bytes 对象的格式化"},"102":{"body":"计算字节串的长度会执行 bytes_as_sequence->sq_length，该字段被赋值为 bytes_length。 static Py_ssize_t\nbytes_length(PyBytesObject *a)\n{ return Py_SIZE(a);\n} Py_SIZE 是一个宏，我们之前说过，它会返回对象的 ob_size。 name = b\"satori\"\n# 直接返回 ob_size\nprint(len(name)) # 6 ob_size 维护了 bytes 对象的有效字节个数，计算长度的时候直接返回。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 计算 bytes 对象的长度","id":"102","title":"计算 bytes 对象的长度"},"103":{"body":"bytes 对象支持乘法操作，可以重复指定次数，举个例子。 word = b\"abc\"\n# 重复 3 次\nprint(word * 3) # b'abcabcabc' 我们看到这里使用了乘法运算符，所以很容易联想到 PyNumberMethods 的 nb_mul，但对于 bytes 对象而言却不是这样，它对应的是 PySequenceMethods 的 sq_repeat。所以 Python 的同一个操作符，在底层会对应不同的函数，比如 long_mul 和 float_mul、以及这里的 bytes_repeat，在 Python 的层面都是 * 这个操作符。 下面我们看一下具体逻辑，它由 bytes_repeat 函数实现。 static PyObject *\nbytes_repeat(PyBytesObject *a, Py_ssize_t n)\n{ Py_ssize_t i; Py_ssize_t j; Py_ssize_t size; // 新创建的 bytes 对象的 ob_size PyBytesObject *op; // 指向新创建的 bytes 对象 size_t nbytes; // 应该为 bytes 对象内部的 char 数组（ob_sval）申请多大内存 // 如果 bytes 对象乘上一个小于 0 的数，那么等价于乘以 0 if (n < 0) n = 0; // Py_SIZE(a) * n 就是新创建的 bytes 对象的长度 // 如果这个长度超过了 PY_SSIZE_T_MAX，那么报错，字节串过长 // 另外注意这里的条件，正常思路是 Py_SIZE(a) * n > PY_SSIZE_T_MAX // 但为了避免 Py_SIZE(a) * n 发生溢出，所以改成了除法 // 这个和我们写二分查找求平均值是一个道理 if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) { PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 将 Py_SIZE(a) * n 赋值给 size size = Py_SIZE(a) * n; // 如果 size 和 Py_SIZE(a) 相等，说明 n 为 1，或者 Py_SIZE(a) 为 0 // 但不管哪一种，都意味着新创建的 bytes 对象和原始的 bytes 对象是相同的 // 既然这样的话，就没必要创建了，直接给原始的 bytes 对象的引用计数加一，然后返回即可 if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) { Py_INCREF(a); return (PyObject *)a; } // 需要为内部的 char 数组申请的内存大小，一个元素一个字节 // 注：严格意义上说，nbytes 应该等于 char 数组的内存大小减 1 // 因为额外存储 '\\0' 所需的一字节被算在了 PyBytesObject_SIZE 里面 // 所以这个 nbytes 的含义其实和 bytes 对象的长度是等价的 nbytes = (size_t)size; // PyBytesObject_SIZE + nbytes 便是 bytes 对象的内存大小了 // 但如果两者相加的结果反而小于等于 nbytes，说明产生溢出了（发生了环绕） if (nbytes + PyBytesObject_SIZE <= nbytes) { // 那么报错，字节串太长了 PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 为新创建的 bytes 对象申请 PyBytesObject_SIZE + nbytes 大小的内存 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + nbytes); // 如果 op 为 NULL，说明内存不足 if (op == NULL) return PyErr_NoMemory(); // 初始化，将 op->ob_type 设置为 &PyBytes_Type，将 op->ob_size 设置为 size (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); // 将 ob_shash 初始化为 -1，等到需要计算的时候，再更新 ob_shash // 一旦更新，后续就不用再计算了，会直接返回 ob_shash op->ob_shash = -1; // ob_sval 要额外存储一个 '\\0'，显然它位于索引为 size 的位置 // 因此有效字符的数量为 size，但 ob_sval 的大小为 size + 1 // 那么问题来了，既然这样的话，nbytes 应该等于 size + 1 才对，为啥等于 size 呢 // 很简单，原因已经说过了，因为 PyBytesObject_SIZE 为 offsetof(PyBytesObject, ob_sval) + 1 // offsetof(PyBytesObject, ob_sval) 表示从结构体起始位置到 ob_sval 的偏移量 // 或者你也可以理解为 ob_sval 之前的所有字段的大小 // 但它又额外加上了 1，所以 '\\0' 需要的空间已经被申请了，因此没有问题 op->ob_sval[size] = '\\0'; // 此时对象的内存就已经申请好了，类型、长度等元数据也设置好了，接下来就是拷贝元素了 // 首先做一个快分支判断，如果原始的 bytes 对象的长度为 1，证明新的 bytes 对象的所有字节都是一样的 // 直接将 op->ob_sval 里面的 n 个元素设置为 a->ob_sval[0] 即可 if (Py_SIZE(a) == 1 && n > 0) { memset(op->ob_sval, a->ob_sval[0] , n); return (PyObject *) op; } // 否则将 a->ob_sval 里面除了 '\\0' 之外的有效字符拷贝到 op->ob_sval 里面 // 每次拷贝 Py_SIZE(a) 个字符，直到拷贝的字符个数达到 size i = 0; if (i < size) { memcpy(op->ob_sval, a->ob_sval, Py_SIZE(a)); i = Py_SIZE(a); } while (i < size) { j = (i <= size-i) ? i : size-i; memcpy(op->ob_sval+i, op->ob_sval, j); i += j; } // 将 PyBytesObject * 类型的 op 转成 PyObject *，然后返回，交给变量保存 return (PyObject *) op;\n} 所以通过观察源码，你会发现 Python 里面的操作并没有什么神奇的，简单思考一下就知道它的底层逻辑。再比如后续介绍的切片截取，即使现在还没看具体源码，但也能猜到底层就是单纯的 for 循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 将 bytes 对象重复 N 次","id":"103","title":"将 bytes 对象重复 N 次"},"104":{"body":"bytes 对象也支持通过索引和切片截取指定部分的元素。 buf = b\"abcde\"\n# 基于索引获取元素，拿到的是整数\nprint(buf[0]) # 97\n# 基于切片获取元素，拿到的依旧是字节串\nprint(buf[0: 1]) # b'a' 那么底层是怎么做的呢？ static PyObject*\nbytes_subscript(PyBytesObject* self, PyObject* item)\n{ // 如果是 buf[0] 这种，那么 self 就是 buf，item 就是 0 // 如果是 buf[0: 3] 这种，那么 self 就是 buf，item 就是 slice(0, 3) // 所以要对 item 进行检测，判断它到底是索引还是切片 if (PyIndex_Check(item)) { // 如果 item 是整数或者实现了 tp_as_number->nb_index // 那么表示索引，会转成 Py_ssize_t，如果转换失败，那么会设置异常回溯栈 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError); // 如果 PyErr_Occurred() 为真，那么表示有异常发生 // 但问题是这里为什么要多一个 i == -1 呢？我们稍后再说 if (i == -1 && PyErr_Occurred()) return NULL; // 如果转换之后发现 i 小于 0，表示使用的是负数索引 // 那么要加上长度，变成正数索引，因此负数索引本质上也是 Python 的一个语法糖 if (i < 0) i += PyBytes_GET_SIZE(self); // 到这里发现 i 如果还小于 0，或者本身大于等于长度，那么索引越界 if (i < 0 || i >= PyBytes_GET_SIZE(self)) { PyErr_SetString(PyExc_IndexError, \"index out of range\"); return NULL; } // 否则说明索引 i 是合法的，那么获取数组 ob_sval 中索引为 i 的元素 // 但拿到的是 C 的整数，所以还要基于 C 整数创建 Python 整数，然后返回 return PyLong_FromLong((unsigned char)self->ob_sval[i]); } // 如果 item 是切片 else if (PySlice_Check(item)) { // 我们知道切片有三个属性，分别是起始位置、终止位置、步长 Py_ssize_t start, stop, step, slicelength, i; size_t cur; char* source_buf; char* result_buf; PyObject* result; // 解析切片，将内部属性赋值给 start、stop、step // 关于 PySlice_Unpack 我们在介绍切片的时候说过 if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 这个函数在介绍切片的时候也说过 // 它会调整 start 和 stop 的值，比如将负数转成正数，然后返回应该遍历的元素个数 slicelength = PySlice_AdjustIndices(PyBytes_GET_SIZE(self), &start, &stop, step); // 如果小于等于 0，说明截取不到任何元素，因此直接返回空字节串 if (slicelength <= 0) { // 基于 C 的字符数组和拷贝的字节数，创建 Python 的字节串 return PyBytes_FromStringAndSize(\"\", 0); } // 如果 start 为 0，step 为 1，并且截取的元素个数和原始字节串的长度相等 // 比如 buf[::] 这种，说明截取之后的字节串和原始字节串相同 // 那么直接给原始字节串增加一个引用计数，然后返回即可 else if (start == 0 && step == 1 && slicelength == PyBytes_GET_SIZE(self) && PyBytes_CheckExact(self)) { Py_INCREF(self); return (PyObject *)self; } // 如果步长为 1，那么从索引为 start 的位置截取 slicelength 个字节即可 // PyBytes_AS_STRING(self) 会返回字节串的 ob_sval，即 C 字符数组 // ob_sval + start 会将指针偏移到索引为 start 的位置 // 然后通过 C 的 memcpy 函数从 start 开始拷贝 slicelength 个字节 else if (step == 1) { return PyBytes_FromStringAndSize( PyBytes_AS_STRING(self) + start, slicelength); } // 否则说明步长不为 1，此时只能使用循环了 else { // 拿到原始字节串的 ob_sval source_buf = PyBytes_AS_STRING(self); // 创建长度为 slicelength 的字节串 // 注意：此时内部字符数组的容量已经有了，但还没有元素 result = PyBytes_FromStringAndSize(NULL, slicelength); if (result == NULL) return NULL; // 拿到新创建的字节串的 ob_sval result_buf = PyBytes_AS_STRING(result); // 从 start 开始遍历，遍历 slicelength 次，指针每次跳 step 个元素 for (cur = start, i = 0; i < slicelength; cur += step, i++) { // 将元素设置进去 result_buf[i] = source_buf[cur]; } // 返回 return result; } } // 如果 item 既不是整数也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"byte indices must be integers or slices, not %.200s\", Py_TYPE(item)->tp_name); return NULL; }\n} 虽然代码有点长，但逻辑一点都不难。还是那句话，对于 C 这样朴素的语言来说，就是 if 判断加循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 基于索引和切片获取元素","id":"104","title":"基于索引和切片获取元素"},"105":{"body":"在看 bytes_subscript 源码时，我们提出了一个问题。 上面代码中为什么要有一个 i == -1 判断呢？要解释这一点，首先必须要理解 Python 的异常是怎么抛出来的。 所谓的抛异常，本质上就是底层的某个 C 函数的代码逻辑出现了问题，不能继续执行了，于是将异常信息设置到回溯栈中，并给出一个表示错误的返回值。当解释器发现返回值不对时，就知道程序出错了，于是将回溯栈的异常写入到 stderr（标准错误输出）中。 比如这里，当检测到索引小于 0 或大于等于长度时，就知道索引越界了，不能再执行了。于是会通过 PyErr_SetString 将异常设置到回溯栈中，并返回了 NULL，表示错误的返回值。 因为对于当前函数来说，它的返回值类型是 PyObject *，如果正常执行，那么返回值应该指向一个合法的 PyObject。但当逻辑出现错误时，就意味着函数不能再执行了，于是设置异常并返回 NULL。而解释器在看到返回值为 NULL 时，就知道该函数执行出现错误了，那么会将回溯栈里的异常信息输出到 stderr 中， data = []\n# data[1] 在底层会执行 bytes_subscript(data, 1)\n# 但是发现索引 1 大于等于长度，于是会将异常信息写入到 stderr，并返回 NULL\n# 解释器发现返回的是 NULL，就知道执行出错了，否则返回值一定会指向一个合法的 PyObject\n# 于是解释器会将回溯栈里的异常写入到 stderr，并终止运行（暂时不考虑异常捕获）\nprint(data[1]) 在 Python 中看到的就是下面这个样子。 所以这就是抛异常的本质，如果 C 函数执行逻辑有问题，那么会以异常的形式将信息写入到回溯栈，并给出一个表示错误的返回值。外界发现返回值有问题时，就知道执行出错了，最终会由解释器将回溯栈里的异常写入到 stderr 当中。 既然 C 函数执行出现问题会设置异常，那么判断函数执行是否有问题，除了看它的返回值是否正常之外，还可以通过检测异常回溯栈。如果回溯栈里面有异常，调用 PyErr_Occurred 会返回真，否则返回假。 但 PyErr_Occurred 的效率稍微低一些，而直接判断返回值会更快，因为只是一个比较操作。比如这里的 bytes_subscript 函数，只需要检测它的返回值是否等于 NULL 即可判断函数执行是否出现异常。因为返回值类型是 PyObject *，如果正常执行，返回值一定不是 NULL，否则说明程序出问题了。 但 PyNumber_AsSsize_t 函数则不同，该函数的返回值类型是整型。 索引要么是整数，要么是实现了 __index__ 的类的实例对象，内部调用的 _PyNumber_Index 会统一将 item 转成 Python 整数并返回，如果转换失败则设置异常并返回 NULL。 而 PyNumber_AsSsize_t 函数则负责将 Python 整数转成 C 的 ssize_t 整数，但当它发现返回的 value 没有指向一个合法的 PyObject，而是 NULL，就知道 _PyNumber_Index 执行失败了。那么对于 PyNumber_AsSsize_t 而言，它也不能再执行了，应该返回一个表示错误的返回值。但 PyNumber_AsSsize_t 的返回值类型不是 PyObject *，而是整型，所以它不能返回 NULL。那么返回多少呢？解释器使用 -1 来充当表示错误的哨兵返回值。 但 -1 除了可以表示出现错误，也可能是函数正常执行，而返回值本身就是 -1。所以和指针类型不同，对于指针类型，通过返回值是否为 NULL 即可判断函数是否执行正常，而返回整型则需要借助 PyErr_Occurred。 比如发现 i 不等于 -1，说明 PyNumber_AsSsize_t 执行正常，不用再判断了。如果 i 等于 -1，那么则需要进一步检查异常回溯栈，如果栈不为空，证明确实发生错误了。如果栈为空，证明此时返回的 -1 不是因出现错误而返回的哨兵值，而是函数正常执行、但返回值本身就是 -1。 假设 PyNumber_AsSsize_t 因为索引类型不合法而返回了 -1，那么 bytes_subscript 就知道调用出现了错误，于是也不能再执行了，于是立即返回。由于它的返回值类型是 PyObject *，所以会返回 NULL。而最后当解释器看到 bytes_subscript 返回的是 NULL 时，就知道程序应该报错，于是会将回溯栈里的异常抛出来，并结束进程。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 聊一聊异常","id":"105","title":"聊一聊异常"},"106":{"body":"以上我们就介绍了 bytes 对象（字节串）的一些操作的底层实现，不过还没结束，下一篇文章我们来聊一聊 bytes 对象的加法运算。 当然加法运算本身很简单，之所以单独摘出来是因为背后涉及一个非常重要的概念：缓冲区，它也是 Numpy 得以实现的关键，下一篇文章细聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 小结","id":"106","title":"小结"},"107":{"body":"bytes 对象支持加法运算，将两个 bytes 对象合并为一个，举个例子。 b1 = b\"abc\"\nb2 = b\"def\"\nprint(b1 + b2) # b'abcdef' 这背后是怎么实现的呢？我们通过源码分析一下，并通过 bytes 对象的相加，介绍一下缓冲区的知识。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 楔子","id":"107","title":"楔子"},"108":{"body":"提到加法，很容易联想到 PyNumberMethods 的 nb_add，比如：PyLongObject 的 long_add 和 PyFloatObject 的 float_add。 但对于 bytes 对象而言却不是这样，加法操作对应的是 PySequenceMethods 的 sq_concat。所以我们将加法运算改成合并，会更合适一些，只是它在 Python 层面对应的也是 + 操作符。对于 bytes 对象而言，sq_concat 字段会被赋值为 bytes_concat。 static PyObject *\nbytes_concat(PyObject *a, PyObject *b)\n{ // 两个 Py_buffer 结构体类型的变量，用于维护缓冲区 // 关于缓冲区，我们一会儿说 Py_buffer va, vb; // 相加结果 PyObject *result = NULL; // 此时缓冲区啥也没有，默认将缓冲区的长度初始化为 -1 va.len = -1; vb.len = -1; // 每个 bytes 对象底层都对应一个缓冲区，可以通过 PyObject_GetBuffer 获取 // 这里获取两个 bytes 对象的缓冲区，然后交给变量 va 和 vb // 获取成功返回 0，获取失败返回非 0 // 如果下面的条件不成功，就意味着获取失败了，说明至少有一个老铁不是 bytes 类型 if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 || PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) { // 然后设置异常，PyExc_TypeError 表示 TypeError（类型错误） // 专门用来表示对一个对象执行了它所不支持的操作 PyErr_Format(PyExc_TypeError, \"can't concat %.100s to %.100s\", Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name); // 比如 b\"123\" + 123 就会得到 TypeError: can't concat int to bytes // 和这里设置的异常信息是一样的，然后当出现异常之后，直接跳转到 done 标签 goto done; } // 这里判断是否有一方长度为 0 // 如果 a 的长度为 0，那么相加之后的结果就是 b if (va.len == 0 && PyBytes_CheckExact(b)) { result = b; Py_INCREF(result); goto done; } // 逻辑和上面类似，如果 b 的长度为 0，那么相加之后的结果就是 a if (vb.len == 0 && PyBytes_CheckExact(a)) { result = a; Py_INCREF(result); goto done; } // 判断两个 bytes 对象合并之后，长度是否超过 PY_SSIZE_T_MAX // 所以 bytes 对象是有长度限制的，因为维护长度的 ob_size 有最大范围 // 但还是之前说的，这个条件基本不可能满足，除非你写恶意代码 // 补充一句，这个 if 条件看起来会有些别扭，更直观的写法应该像下面这样 // if (va.len + vb.len > PY_SSIZE_T_MAX)，但 va.len + vb.len 可能会溢出 if (va.len > PY_SSIZE_T_MAX - vb.len) { PyErr_NoMemory(); goto done; } // 否则的话，创建指定容量的 PyBytesObject result = PyBytes_FromStringAndSize(NULL, va.len + vb.len); if (result != NULL) { // PyBytes_AS_STRING 会获取 PyBytesObject 的 ob_sval 字段 // 将缓冲区 va 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 va.len memcpy(PyBytes_AS_STRING(result), va.buf, va.len); // 将缓冲区 vb 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 vb.len // 但是要从 va.len 的位置开始拷贝，不然会把之前的内容覆盖掉 memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len); } done: // 拷贝完之后，将 va 和 vb 里的内容释放掉，否则可能会导致内存泄漏 if (va.len != -1) PyBuffer_Release(&va); if (vb.len != -1) PyBuffer_Release(&vb); return result;\n} 代码虽然有点长，但是不难理解，重点是里面的 Py_buffer。我们以 a = b\"ab\"，b = b\"cde\" 为例，看一下 a + b 是怎么做的？ 说白了整个过程就是将 a->ob_sval 和 b->ob_sval 拷贝到 result->ob_sval 中。但问题是为啥不直接拷贝，而是要搞出来一个 Py_buffer 呢？这就要说一说 Python 的缓冲区了。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » bytes 对象的加法运算","id":"108","title":"bytes 对象的加法运算"},"109":{"body":"为了更好地理解缓冲区，我们需要解释一下什么是缓冲区协议。缓冲区协议是一个 C 级协议，它定义了一个具有数据缓冲区和元数据的 C 级结构体，这个结构体就是上面的 Py_buffer。通过 Py_buffer 来描述缓冲区的布局、数据类型和读写权限，并且还定义了支持协议的对象所必须实现的 API。 实现缓冲区协议的对象有 bytes对象、array.array 对象、以及最知名的 numpy.ndarray 对象。 至于缓冲区本身，它就是一个单纯的一维数组，负责存储具体的数据。我们以 numpy 数组为例，不管数组是多少维的，底层的缓冲区永远是一个一维数组。那么问题来了，我们在定义数组时设置的维度信息要如何体现呢？答案是通过 Py_buffer，来看一下它的底层结构。 // Include/cpython/object.h typedef struct bufferinfo { // 指针，指向具体的缓冲区，注意：缓冲区就是个一维数组 void *buf; // 指向实现缓冲区协议的对象本身 PyObject *obj; // 缓冲区的长度 Py_ssize_t len; // 缓冲区中每个元素的大小 Py_ssize_t itemsize; // 缓冲区是否只读，0 表示可读写、1 表示只读 int readonly; // 维度，比如数组的 shape 为 (3, 4, 5)，那么它的 ndim 就是 3 int ndim; // 格式化字符串，用于描述缓冲区的元素类型 char *format; // 等价于 numpy 数组的 shape // 因此缓冲区永远是个一维数组，由 buf 字段指向 // 而其它字段则负责描述这个一维数组应该怎么使用 Py_ssize_t *shape; // 在某个维度下，从一个元素到下一个元素所需要跳跃的字节数 Py_ssize_t *strides; Py_ssize_t *suboffsets; void *internal;\n} Py_buffer; 以上就是 Py_buffer，它的 buf 字段指向了具体的缓冲区，对于 bytes 对象而言就是内部的 ob_sval 字段。再比如 numpy 数组的拷贝，默认情况下在拷贝数组时只会将 Py_buffer 拷贝一份，而 Py_buffer 内部的 buf 字段指向的缓冲区则不会拷贝。 import numpy as np # Py_buffer.buf 指向了缓冲区\n# Py_buffer.shape 为 (6,)\narr1 = np.array([3, 9, 5, 7, 6, 8])\n# 将 Py_buffer 拷贝一份，并且 Py_buffer.shape 变成了 (2, 3)\n# 但 Py_buffer.buf 指向的缓冲区没有拷贝\narr2 = arr1.reshape((2, 3)) # 然后在通过索引访问的时候，可以认为 numpy 为其创建了虚拟的索引轴\n# 由于 arr1 只有一个维度，那么 numpy 会为其创建一个虚拟的索引轴\n\"\"\"\narr1 = [3 9 5 7 6 8] index1: 0 1 2 3 4 5 buf: 3 9 5 7 6 8 \"\"\"\n# arr2 有两个维度，shape 是 (2, 3)\n# 那么 numpy 会为其创建两个虚拟的索引轴\n\"\"\"\narr2 = [[3, 9, 5] [7, 6, 8]] index1: 0 0 0 1 1 1 index2: 0 1 2 0 1 2 buf: 3 9 5 7 6 8 \"\"\"\n# 缓冲区中索引为 4 的元素被修改\narr2[1, 1] = 666\n# 由于 arr1 和 arr2 共享一个缓冲区\n# 所以 print(arr1[4]) 也会打印 666\nprint(arr1[4]) # 666 以上就是缓冲区的内容，关于缓冲区在后续还会详细介绍，到时候我们也会让自定义的实例对象支持缓冲区。 回到 bytes 对象，它也实现了缓冲区协议，内部的 ob_sval（一个一维数组）就是对应的缓冲区，Py_buffer 里面的 buf 字段同样指向了这个缓冲区，而其它的字段则负责描述该如何使用这个缓冲区，可以理解为元信息。正如 numpy 的数组，虽然多个数组底层共用一个缓冲区，数据也只有一份，但在 numpy 的层面却可以表现出不同的维度，究其原因就是元信息不同。 相信你现在肯定明白 Py_buffer 存在的意义了，就是共享内存。不管什么对象，只要实现了缓冲区协议，那么就可以直接向彼此暴露自身的缓冲区。并且在操作的时候，统一使用 Py_buffer，保证不同类型的对象的操作是一致的。 import numpy as np # bytes 对象实现了缓冲区协议，后续操作时会创建 Py_buffer 实例\n# Py_buffer.buf 指向的缓冲区便是 bytes 对象的 ob_sval\n# 对于当前来说就是 {'a', 'b', 'c', 'd', '\\0'}\nb = b\"abcd\" # np.frombuffer 表示基于已有的缓冲区创建数组，因此会共享 bytes 对象的缓冲区\n# 但问题是缓冲区只是一个普通的一维数组，numpy 该怎么解析这个缓冲区呢\n# 所以我们必须显式地指定 dtype，而 \"S1\" 表示按照单个字节来进行解析\narr1 = np.frombuffer(b, dtype=\"S1\")\nprint(arr1) # [b'a' b'b' b'c' b'd'] # \"S2\" 表示按照两个字节来进行解析\narr2 = np.frombuffer(b, dtype=\"S2\")\nprint(arr2) # [b'ab' b'cd'] # 那么问题来了，按照三个字节解析是否可行呢？\n# 答案是不可行，因为缓冲区的大小不是 3 的整数倍\n# 而 \"S4\" 显然是可以的\narr3 = np.frombuffer(b, dtype=\"S4\")\nprint(arr3) # [b'abcd'] # 按照 int8 进行解析\narr4 = np.frombuffer(b, dtype=\"int8\")\nprint(arr4) # [ 97 98 99 100] # 按照 int16 进行解析\n# 显然 97 98 整体会被解析成一个整数，99 100 整体会被解析成一个整数\n# 你想到了什么，这不就类似于 Python 整数的底层实现嘛\n\"\"\"\n97 -> 01100001\n98 -> 01100010\n那么 97 98 组合起来就是 01100010_01100001 99 -> 01100011\n100 -> 01100100\n那么 99 100 组合起来就是 01100100_01100011\n\"\"\"\nprint(0b01100010_01100001) # 25185\nprint(0b01100100_01100011) # 25699\nprint(np.frombuffer(b, dtype=\"int16\")) # [25185 25699] # 按照 int32 来解析，显然这 4 个字节整体表示一个 int32\nprint(0b01100100_01100011_01100010_01100001) # 1684234849\nprint(np.frombuffer(b, dtype=\"int32\")) # [1684234849] 怎么样，是不是有点神奇呢？相信你在使用 numpy 的时候应该会有更加深刻的认识了，这就是缓冲区协议的威力。哪怕是不同的对象，只要都实现了缓冲区协议，那么彼此之间就可以暴露底层的缓冲区，从而实现共享内存。 所以 np.frombuffer 就是直接根据对象的缓冲区来创建数组，然后它底层的 buf 字段也指向这个缓冲区。但它不知道该如何解析这个缓冲区，所以我们需要显式地指定 dtype 来告诉它，相当于告诉它一些元信息。 那么问题来了，我们能不能修改缓冲区呢？ import numpy as np b = b\"abcd\"\narr = np.frombuffer(b, dtype=\"S1\") try: arr[0] = b\"A\"\nexcept ValueError as e: print(e) # assignment destination is read-only # 答案是不可以的，因为原始的 bytes 对象不可修改，所以缓冲区只读\n# 但我们真的就没办法了吗？还记得之前介绍的骚操作吗？\nfrom ctypes import * class PyBytesObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_shash\", c_ssize_t), (\"ob_sval\", 5 * c_byte), ]\nobj = PyBytesObject.from_address(id(b))\n# 修改缓冲区之前，打印 arr\nprint(arr) # [b'a' b'b' b'c' b'd']\n# 修改缓冲区之后，打印 arr\nobj.ob_sval[0] = ord(\"A\")\nprint(arr) # [b'A' b'b' b'c' b'd'] 我们看到由于共享缓冲区，所以修改 bytes 对象也会影响数组 arr，只是由于 bytes 对象不可变，我们只能出此下策。但其实还有一个办法，就是使用 bytearray 对象。 import numpy as np # 可以理解为可变的 bytes 对象\nb = bytearray(b\"abcd\")\narr = np.frombuffer(b, dtype=\"S1\") print(b) # bytearray(b'abcd')\n# 此时缓冲区是可修改的，并且修改任何一个对象都会影响另一个，因为它们共享同一个缓冲区\narr[0] = b\"A\"\n# 再次打印\nprint(b) # bytearray(b'Abcd') Py_buffer 的实现，也是 numpy 诞生的一个重要原因。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 详解缓冲区","id":"109","title":"详解缓冲区"},"11":{"body":"所谓定长和变长，取决于对象所占的内存大小是否固定，举个例子。 >>> import sys\n>>> sys.getsizeof(\"\")\n49\n>>> sys.getsizeof(\"hello\")\n54\n>>> sys.getsizeof(\"hello world\")\n60 >>> sys.getsizeof(1.0)\n24\n>>> sys.getsizeof(3.14)\n24\n>>> sys.getsizeof((2 << 30) + 3.14)\n24\n>>> 我们看到字符串的长度不同，所占的内存也不同，像这种内存大小不固定的对象，我们称之为变长对象；而浮点数所占的内存都是一样的，像这种内存大小固定的对象，我们称之为定长对象。 至于 Python 如何计算对象所占的内存，我们在剖析具体对象的时候会说，因为这涉及到底层对应的结构体。 所以变长对象的特点是：同一个类型的实例对象，如果值不同，那么占用的内存大小不同。像字符串、列表、元组、字典等，它们毫无疑问都是变长对象。值得一提的是，整数也是变长对象，因为 Python 整数的值在底层是通过数组维护的，后续介绍整数实现的时候再聊。 而定长对象的特点是：同一个类型的实例对象，不管值是多少，占用的内存大小始终是固定的，比如浮点数。因为 Python 的浮点数的值在 C 中是通过一个 double 来维护的。而 C 里面值的类型一旦确定，那么内存大小就不变了，所以 Python 浮点数的内存大小也是不变的。 但既然类型固定，内存大小固定，那么范围肯定是有限的。所以当浮点数不断增大，会牺牲精度来进行存储。 如果实在过大，则抛出 OverFlowError。 当然除了浮点数之外，布尔值、复数等也属于定长对象，它们占用的内存大小是固定的。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 定长对象和变长对象","id":"11","title":"定长对象和变长对象"},"110":{"body":"通过两个 bytes 对象相加，我们了解了什么是缓冲区、缓冲区协议，以及存在的作用，并且通过 numpy 进行了解释。了解缓冲区，可以让你更加深刻地理解 numpy。 下面再来总结一下： 如果一个类型对象实现了 tp_as_buffer，那么它的实例对象便支持缓冲区协议； tp_as_buffer 是一个函数指针，指向的函数负责初始化 Py_buffer； 在共享缓冲区的时候，比如 np.frombuffer(obj)，会直接调用 obj 的类型对象的 tp_as_buffer 字段指向的函数，拿到 Py_buffer 实例的 buf 字段指向的缓冲区。但 numpy 不知道该怎么解析这个缓冲区，所以还需要我们指定 dtype 参数。 缓冲区存在的最大意义就是共享内存，numpy 的数组在拷贝的时候，默认只拷贝 Py_buffer 实例，至于 Py_buffer 的 buf 字段指向的缓冲区默认是不会拷贝的。比如数组有 100 万个元素，这些元素都存储在缓冲区中，被 Py_buffer 的 buf 字段指向，拷贝的时候这 100 万个元素是不会拷贝的。 numpy 数组的维度、shape，是借助于 Py_buffer 中的元信息体现的，维度和 shape 不同，访问缓冲区元素的方式也不同。但存储元素的缓冲区，永远是一个一维数组，由 buf 字段指向。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 小结","id":"110","title":"小结"},"111":{"body":"bytes 对象是不可变对象，那么根据我们对浮点数的了解，可以大胆猜测 bytes 对象也有自己的缓存池。事实上确实如此，为了优化单字节 bytes 对象的创建效率，Python 底层维护了一个缓存池，该缓存池是一个 PyBytesObject * 类型的数组。 // Objects/bytesobject.c // 保存了 256 个单字节 bytes 对象，对应的 ASCII 码为 0 ~ 255\nstatic PyBytesObject *characters[UCHAR_MAX + 1];\n// 保存空 bytes 对象\nstatic PyBytesObject *nullstring; Python 内部创建单字节 bytes 对象时，会先检查目标对象是否已在缓存池中。PyBytes_FromString 函数是负责创建 bytes 对象的一个常用的 Python/C API，我们看一下它的逻辑。 // Objects/bytesobject.c // 基于 C 字符串创建 bytes 对象\nPyObject *\nPyBytes_FromString(const char *str)\n{ size_t size; // bytes 对象的长度 PyBytesObject *op; // 指向创建的 bytes 对象 assert(str != NULL); // 计算 C 字符串的长度，它和对应的 bytes 对象的长度是相等的 size = strlen(str); if (size > PY_SSIZE_T_MAX - PyBytesObject_SIZE) { PyErr_SetString(PyExc_OverflowError, \"byte string is too long\"); return NULL; } // 如果 size 等于 0，并且 nullstring 保存了空 bytes 对象，那么直接返回 if (size == 0 && (op = nullstring) != NULL) {\n#ifdef COUNT_ALLOCS _Py_null_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 如果 size 等于 1，比如 char *str = \"a\"，证明创建的是单字节对象 // 而 str 是字符串首元素的地址，所以 *str 会得到 'a'，即 97 // 假设 *str 是 97，那么 op 就是 bytes_characters[97] if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {\n#ifdef COUNT_ALLOCS _Py_one_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 否则创建新的 PyBytesObject 对象，此时是个空 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size); if (op == NULL) return PyErr_NoMemory(); // 初始化内部字段 (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); op->ob_shash = -1; // 将 C 字符串拷贝到 ob_sval 中 memcpy(op->ob_sval, str, size+1); // 如果 size == 0，说明创建的是空 bytes 对象，那么赋值给 nullstring if (size == 0) { nullstring = op; Py_INCREF(op); } else if (size == 1) { // 如果 size == 1，说明创建的是单字节 bytes 对象，那么放入到缓存池中 // 并且在缓存池中的索引，就是该字节对应的 ASCII 码 characters[*str & UCHAR_MAX] = op; Py_INCREF(op); } // 转成泛型指针之后返回 return (PyObject *) op;\n} 整体来说并不难，该 API 会将 C 字符串全部拷贝到 ob_sval 中。但如果 C 字符串长度为 10，而我们只希望基于前 n 个字符创建 bytes 对象，这时候可以使用 PyBytes_FromStringAndSize 函数。 PyBytes_FromString(\"Hello World\") 会返回 b\"Hello World\"。 PyBytes_FromStringAndSize(\"Hello World\", 5) 会返回 b\"Hello\"，如果传递的第二个参数 size 和 C 字符串长度相同，那么效果和 PyBytes_FromString 是等价的。 至于 PyBytes_FromStringAndSize 的逻辑和 PyBytes_FromString 类似，缓存池部分也是一样的，可以自己看一下。 当 Python 程序开始运行时，字节序列缓存池是空的。但随着单字节 bytes 对象的创建，缓存池中的对象慢慢多了起来。这样一来，单字节序列首次创建后便在缓存池中缓存起来，后续再使用时会直接从缓存池中获取，避免重复创建和销毁。与前面章节介绍的小整数对象池一样，字节序列缓存池也只能容纳为数不多的 256 个单字节序列，但使用频率非常高。 缓存池技术作为一种以空间换时间的优化手段，只需较小的内存为代价，便可明显提升执行效率。 >>> a1 = b\"a\"\n>>> a2 = b\"a\"\n>>> a1 is a2\nTrue\n>>>\n>>> a1 = b\"ab\"\n>>> a2 = b\"ab\"\n>>> a1 is a2\nFalse\n>>> 显然此时不需要解释了，单字节 bytes 对象会缓存起来，放到缓存池中。至于空字节 bytes 对象，则是由专门的 nullstring 变量保存，它们都是单例的。 到目前为止，关于 bytes 对象的内容就说完了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"26. 解密 bytes 对象的缓存池","id":"111","title":"26. 解密 bytes 对象的缓存池"},"112":{"body":"前面我们介绍了 bytes 对象，本篇文章来聊一聊 bytearray 对象，这两者都表示字节串或者字节序列，它们的创建方式和支持的操作也是类似的。 # 基于列表创建，里面的元素为 0 ~ 255 的整数\nb1 = bytes([97, 98, 99])\nb2 = bytearray([97, 98, 99])\nprint(b1)\nprint(b2)\n\"\"\"\nb'abc'\nbytearray(b'abc')\n\"\"\" # 基于字符串创建\nb1 = bytes(\"hello\", encoding='utf-8')\nb2 = bytearray(\"hello\", encoding='utf-8')\nprint(b1)\nprint(b2)\n\"\"\"\nb'hello'\nbytearray(b'hello')\n\"\"\" b1 = bytes.fromhex(\"61626364\")\nb2 = bytearray.fromhex(\"61626364\")\nprint(b1)\nprint(b2)\n\"\"\"\nb'abcd'\nbytearray(b'abcd')\n\"\"\" 但区别在于 bytes 对象是不可变对象，bytearray 对象是可变对象。 # 也可以直接基于 bytes 对象创建 bytearray 对象\n# 反过来也是如此\nb = bytearray(b\"satori\")\nprint(b) # bytearray(b'satori') # 既然是可变对象，那么就意味着可以本地修改内部元素\n# 由于字节序列内部的每个元素都是 0 ~ 255 的整数\n# 因此这里修改时，也必须赋值整数\nb[0] = ord(\"S\")\nprint(b) # bytearray(b'Satori') # 当然，如果基于切片修改，那么需要赋值一个 bytes 对象\nb[0: 2] = b\"SA\"\nprint(b) # bytearray(b'SAtori')\n# 当然也可以赋值一个 bytearray 对象\n# 它和 bytes 对象本质一样，无非是 bytes 对象不能本地修改\nb[0: 3] = bytearray(b\"saT\")\nprint(b) # bytearray(b'saTori') # 在尾部追加字节\nb.append(ord(\" \"))\nb.append(ord(\"h\"))\nb.append(ord(\"e\"))\nb.append(ord(\"l\"))\nb.append(ord(\"l\"))\nb.append(ord(\"o\"))\nprint(b) # bytearray(b'saTori hello') 还是那句话，如果不需要对字节序列做修改的话，那么 bytes 对象和 bytearray 对象是等价的，我们使用 bytes 对象即可。但若是希望字节序列可变，那么只能使用 bytearray 对象。 下面我们来分析一下 bytearray 对象的底层实现。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 楔子","id":"112","title":"楔子"},"113":{"body":"bytearray 对象在底层由 PyByteArrayObject 结构体表示，定义如下。 // Include/bytearrayobject.h typedef struct { PyObject_VAR_HEAD Py_ssize_t ob_alloc; char *ob_bytes; char *ob_start; int ob_exports;\n} PyByteArrayObject; 解释一下每个字段的含义： PyObject_VAR_HEAD：变长对象的公共头部，包含引用计数、类型和长度。 ob_alloc：底层缓冲区的长度，即最多能容纳多少个字节。注意它和 ob_size 的区别，ob_size 表示 bytearray 对象的长度，也就是缓冲区当前已经容纳了多少个字节。如果 append 的时候发现 ob_size 达到了 ob_alloc，那么要对缓冲区进行扩容。 ob_bytes：指向缓冲区的指针，缓冲区是一个连续的内存块，用于存储字节序列的所有数据。 ob_start：ob_bytes 指向缓冲区的物理起始位置，而 ob_start 指向缓冲区的逻辑起始位置。说白了 ob_start 可以指向缓冲区的任意位置，允许字节序列使用部分缓冲区，比如通过切片 [1:] 进行截取，那么 ob_start 便指向缓冲区的第二个元素（逻辑起始位置），而无需重新分配内存。 ob_exports：缓冲区被外部对象引用的次数。 下面我们来创建几个 bytearray 对象，并通过画图来描述对应的底层结构。 b = bytearray(b\"\") 每个结构体字段都是 8 字节，所以一个空 bytearray 对象的大小是 56 字节。 >>> b = bytearray()\n>>> b\nbytearray(b'')\n>>> b.__sizeof__()\n56 结果和我们分析的一样。 b = bytearray(b\"abc\") 由于缓冲区长度为 4，因此大小为 56 + 4 = 60 字节。 >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60 所以我们可以得出结论，bytearray 对象的大小等于 56 + 缓冲区的长度，在不发生扩容的情况下，缓冲区的长度等于 ob_size + 1。 >>> name = \"古明地觉\"\n>>> b = bytearray(name, encoding=\"utf-8\")\n>>> >>> 56 + len(name) * 3 + 1\n69\n>>> b.__sizeof__()\n69 但如果发生扩容会怎么样呢？ >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60\n# 添加一个元素\n>>> b.append(100)\n>>> b\nbytearray(b'abcd')\n>>> b.__sizeof__()\n63 添加一个元素之后，大小从 60 变成了 63，难道不应该是 61 吗？之所以出现这个现象，就是因为扩容的时候多申请了两个字节，我们画张图来展示一下这个过程。 以上就是 bytearray 对象的底层结构。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的底层实现","id":"113","title":"bytearray 对象的底层实现"},"114":{"body":"说完了 bytearray 对象的底层结构之后，再来看看它是怎么创建的？ // Objects/bytearrayobject.c PyObject *\nPyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)\n{ // 基于 C 的字符数组创建 bytearray 对象 // 参数 size 表示 bytearray 对象的长度 PyByteArrayObject *new; Py_ssize_t alloc; // size 必须大于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyByteArray_FromStringAndSize\"); return NULL; } // size 必须小于 PY_SSIZE_T_MAX if (size == PY_SSIZE_T_MAX) { return PyErr_NoMemory(); } // 为 PybyteArrayObject 申请内存，此处调用的是泛型 API new = PyObject_New(PyByteArrayObject, &PyByteArray_Type); // 申请失败返回 NULL if (new == NULL) return NULL; // 如果 size == 0，表示 bytearray 对象的长度为 0 // 那么将 ob_bytes 设置为 NULL，将 alloc 设置为 0 if (size == 0) { new->ob_bytes = NULL; alloc = 0; } else { // 否则将 alloc 设置为 size + 1，因为要多一个 '\\0' alloc = size + 1; // 申请 alloc 个字节的内存，赋值给 ob_bytes new->ob_bytes = PyObject_Malloc(alloc); // 为 NULL 表示申请失败，内存不足 if (new->ob_bytes == NULL) { Py_DECREF(new); return PyErr_NoMemory(); } // 将参数 bytes（这里是 C 字符串）拷贝到 ob_bytes 指向的缓冲区 // 在拷贝的时候，可以指定拷贝的长度，通过 size 参数指定 // 如果希望整个字符串全部拷贝，那么将 size 指定为 strlen(bytes) 即可 if (bytes != NULL && size > 0) memcpy(new->ob_bytes, bytes, size); // 将最后一个元素（索引为 size）设置为 '\\0' new->ob_bytes[size] = '\\0'; /* Trailing null byte */ } // 将 ob_size 字段初始化为 size Py_SIZE(new) = size; // 将 ob_alloc 字段初始化为 alloc new->ob_alloc = alloc; // ob_start 默认等于 ob_bytes new->ob_start = new->ob_bytes; // 缓冲区被引用的次数为 0，因为刚创建 new->ob_exports = 0; // 转成泛型指针之后返回 return (PyObject *)new;\n} 之前在创建 bytes 对象的时候介绍过 PyBytes_FromStringAndSize 这个函数，创建 bytearray 对象和它是类似的。但需要注意的是，bytes 对象和 bytearray 对象都实现了缓冲区，但这两者有一个区别。 bytes 对象的缓冲区存储在 PyBytesObject 结构体内部； bytearray 对象则不是这样，PyByteArrayObject 内部存储的是指针，指针指向了缓冲区； 我们回顾一下这两个结构体的定义。 PyBytesObject 里面的 ob_sval 是一个数组，而 PyByteArrayObject 的 ob_bytes 是一个指针。那为什么会出现这种情况呢？原因在这个系列的最开始就说过了，bytes 对象是不可变的，元素会直接存储在对应的结构体内部。 而 bytearray 对象是可变的，那么它内部只能存储指针，指针指向的内存区域负责存储元素。如果发生扩容，只需申请一片更大的内存区域并将元素拷贝过去，然后改变指针（ob_bytes）指向即可。至于 bytearray 对象本身的地址是不会发生任何变化的，它的扩容对引用它的变量来说是无感知的。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的创建","id":"114","title":"bytearray 对象的创建"},"115":{"body":"以上就是 bytearray 对象，关于它的具体操作就不赘述了，和 bytes 对象是类似的，可以自己尝试读一读。 总之在工作中，如果你不明确需要字节序列可变，那么使用 bytes 对象即可，否则使用 bytearray 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 小结","id":"115","title":"小结"},"116":{"body":"接下来我们将分析 Python 的字符串，这应该是使用频率最高的数据结构了，我们会通过多篇文章来详细阐述字符串的实现原理。 首先字符串是一个变长对象，因为不同长度的字符串所占的内存是不一样的。但同时字符串又是一个不可变对象，因为一旦创建就不可以再修改了。","breadcrumbs":"28. 字符集和字符编码 » 楔子","id":"116","title":"楔子"},"117":{"body":"我们知道计算机的存储单位是字节，一个字节可以表示 256 种字符，对于发明计算机的美国人来说足够了。因为英文字母算上大小写只有 52 个，即便再加上一些特殊字符，数量也不会超过 256 个，因此一个字节完全可以表示。 但随着计算机的普及，越来越多的非英文字符出现，导致一个字节已经无法表示了。所以只能曲线救国，对于一个字节无法表示的字符，使用多个字节表示，这便是多字节编码。而多字节编码也存在相应的问题，就是容易出现乱码。 到这里先不继续往下深入，我们先来理清楚一些概念。","breadcrumbs":"28. 字符集和字符编码 » 多字节编码","id":"117","title":"多字节编码"},"118":{"body":"估计有很多小伙伴搞不清这两者的区别，我们先来解释一下所谓的字符集和字符编码是怎么一回事？ 字符集：系统支持的所有字符组成的集合，像 ASCII、GB2312、Big5、unicode 都属于字符集。只不过不同的字符集所能容纳的字符个数不同，比如 ASCII 字符集不包含中文，unicode 则可以容纳世界上的所有字符； 多字节编码：负责将每个字符转成一个或多个计算机可以接受的具体数字，该数字可以理解为编号，因此字符编码维护了字符和编号之间的对应关系。而编码也分为多种，比如 ASCII、GBK、UTF-8 等等，字符编码不同，那么字符转换之后的编号也不同，当然能转化的字符种类也不同。比如 ASCII 这种字符编码，它就只能转换 ASCII 字符。 当然，ASCII 比较特殊，它既是字符集、也是字符编码。并且不管采用什么编码，ASCII 字符对应的编号永远是相同的。 将字符串中的每一个字符转成对应的编号，那么得到的就是字节序列（bytes 对象），因为计算机存储和网络通讯的基本单位都是字节，所以字符串必须以字节序列的形式进行存储或传输。 因此字符串和字节序列在某种程度上是很相似的，字符串按照指定的编码进行 encode 即可得到字节序列，也就是将每个字符都转成对应的编号；字节序列按照相同的编码 decode 即可得到字符串，也就是根据编号找到对应的字符。 比如我们写了一段文本，然后在存储的时候必须先进行 encode，也就是将每一个字符都转成一个或多个系统可以接受的数字、即对应的编号之后，才可以进行存储。 name = \"古明地觉\" print(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\"\nprint(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 采用不同的编码，得到的字节序列是不同的，比如使用 gbk 编码 encode，那么也必须使用 gbk 编码 decode。否则会因为无法解析而报错，因为字符编码不同，字符对应的编号也不同。 再比如每个国家都有自己的字符编码，你在日本的一台计算机上写好的文件拿到中国的计算机上打开，很有可能出现乱码。因为字符编码不同，字符和编号之间的对应关系也不同，采用不同的字符编码进行解析肯定会出问题。 但我们说，对于 ASCII 字符来说，由于不管采用哪一种编码，它们得到的编号都是固定的。所以编码对于 ASCII 字符来说，没有任何影响。 name = \"satori\" print(name.encode(\"gbk\"))\n\"\"\"\nb'satori'\n\"\"\"\nprint(name.encode(\"gbk\").decode(\"utf-8\"))\n\"\"\"\nsatori\n\"\"\" # 但如果是非 ASCII 字符，就不行了\ntry: \"你好\".encode(\"gbk\").decode(\"utf-8\")\nexcept UnicodeDecodeError as e: print(e) \"\"\" 'utf-8' codec can't decode byte 0xc4 in position 0: invalid continuation byte \"\"\" 这里再回忆一下 bytes 对象，创建的时候可以采用字面量的方式，比如 b\"abc\"，但是 b\"憨\" 却不可以。原因就是憨这个字符不是 ASCII 字符，那么采用不同的字符编码，其对应的编号是不同的。而解释器又不知道我们使用的是哪一种编码，所以不允许这么做，而是需要通过 \"憨\".encode() 的方式手动指定字符编码。 但对于 ASCII 字符而言，不管采用哪一种字符编码，得到的编号都是一样的， 所以 Python 针对 ASCII 字符则允许这种做法，比如 b\"abc\"。并且我们看到，对于汉字来说，在编码之后会对应多个编号，而每个编号占 1 字节，因此不同的字符所占的大小可能不同。","breadcrumbs":"28. 字符集和字符编码 » 字符集和字符编码","id":"118","title":"字符集和字符编码"},"119":{"body":"以上就是字符集和字符编码，字符集就是字符组成的集合，不同字符集所能容纳的字符数量是有限的。字符编码是将字符转成对应的编号，比如将一个字符串中的所有字符都转成对应的编号之后，就得到了字节序列。当然和字符集一样，字符编码能转换的字符种类也是有限的，像汉字我们可以使用 GBK 编码、UTF-8 编码，但是不能使用 ASCII 编码。 以上算是理清楚了一些概念，显然过于简单了，主要是为后面的内容做铺垫。那么下一篇文章，我们就从 Python 的角度来分析字符串的存储方式。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"28. 字符集和字符编码 » 小结","id":"119","title":"小结"},"12":{"body":"以上我们就分析了对象的种类，对象可以被分为可变对象和不可变对象，以及变长对象和定长对象。 不可变对象：对象不支持本地修改； 可变对象：对象支持本地修改； 变长对象：对象维护的值不同，占用的内存大小也不同； 定长对象：占用的内存大小始终固定； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 小结","id":"12","title":"小结"},"120":{"body":"上一篇文章我们介绍了字符集，它是一系列字符组成的集合，但不同的字符集所能容纳的字符是有限的。于是为了能将全世界的字符统一起来，便诞生了 unicode。 unicode 字符集对世界上出现的所有字符都进行了系统的整理，包括各种 emoji，不管是哪个国家的语言，都可以使用 unicode 字符集。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"て\")) # 12390 不管什么文字，都可以用一个 unicode 来表示，它们在字符集中对应一个唯一的码点。所谓码点，就是字符在字符集中的索引，或者说唯一编号。 但是问题来了，unicode 能表示这么多的字符，占用的内存一定不低吧。的确，根据当时的编码，一个 unicode 字符最高会占用到 4 字节，因此对西方人来说就有点苦不堪言了，明明一个字节就够用了，为啥需要那么多。于是又出现了 utf-8，它是为 unicode 提供的一个新的编码规则，具有可变长的功能。不同种类的字符占用的大小不同，比如英文字符使用一个字节存储，汉字使用 3 个字节存储，emoji 使用 4 个字节存储。 但 Python 在表示 unicode 字符串时，使用的却不是 utf-8 编码，至于原因我们下面来分析一下。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 楔子","id":"120","title":"楔子"},"121":{"body":"从 Python3 开始，字符串使用的是 unicode。而根据编码的不同，unicode 的每个字符最大可以占用 4 字节，从内存的角度来说，这种编码有时会比较昂贵。为了减少内存消耗并且提高性能，Python 的内部使用了三种编码方式来表示 unicode。 Latin-1 编码：每个字符占 1 字节; UCS2 编码：每个字符占 2 字节； UCS4 编码：每个字符占 4 字节； 在 Python 编程中，所有字符串的行为都是一致的，而且大多数时候我们都没有注意到差异。然而在处理大文本的时候，这种差异就会变得异常显著，甚至有些让人出乎意料。为了看到内部表示的差异，我们看一下字符串所占的内存大小。 >>> sys.getsizeof(\"a\")\n50\n>>> sys.getsizeof(\"憨\")\n76\n>>> sys.getsizeof(\"😂\")\n80 我们看到都是一个字符，但它们占用的内存却是不一样的。因为 Python 面对不同的字符会采用不同的编码，进而导致大小不同。但需要注意的是，Python 的每一个字符串都需要额外占用至少 49 个字节，因为要存储一些元数据，比如：公共的头部、哈希、长度、字节长度、编码类型等等。 import sys # 对于 ASCII 字符，一个占 1 字节，此时是 Latin-1 编码\nprint(sys.getsizeof(\"ab\") - sys.getsizeof(\"a\")) # 1 # 对于汉字，日文等等，一个占 2 字节，此时是 UCS2 编码\nprint(sys.getsizeof(\"憨憨\") - sys.getsizeof(\"憨\")) # 2\nprint(sys.getsizeof(\"です\") - sys.getsizeof(\"で\")) # 2 # 像 Emoji，则是一个占 4 字节 ，此时是 UCS4 编码\nprint(sys.getsizeof(\"😂😂\") - sys.getsizeof(\"😂\")) # 4 而采用不同的编码，底层结构体实例的元数据也会占用不同大小的内存。 # 所以一个空字符串占用 49 个字节\n# 此时会采用占用内存最小的 Latin-1 编码\nprint(sys.getsizeof(\"\")) # 49\n# 此时使用 UCS2\nprint(sys.getsizeof(\"憨\") - 2) # 74\n# UCS4\nprint(sys.getsizeof(\"🍌\") - 4) # 76 如果编码是 Latin-1，那么结构体实例的元数据会占 49 个字节；编码是 UCS2，占 74 个字节；编码是 UCS4，占 76 个字节。然后字符串所占的字节数就等于：元数据 + 字符个数 * 单个字符所占的字节。","breadcrumbs":"29. Python 是怎么存储字符串的？ » unicode 的三种编码","id":"121","title":"unicode 的三种编码"},"122":{"body":"上面提到的三种编码是 Python 在底层所使用的，但我们知道 unicode 还有一个 utf-8 编码，那 Python 为啥不用呢？ 先来抛出一个问题，我们知道 Python 支持通过索引查找一个字符串指定位置的字符（注意不是字节），比如 s[2] 查找的就是字符串 s 中的第 3 个字符。 s = \"古明地觉\"\nprint(s[2]) # 地 那么问题来了，通过索引查找字符串的某个字符，时间复杂度为 O(1)，那么 Python 是怎么通过索引瞬间定位到指定字符的呢？显然是通过指针的偏移，用索引乘上每个字符占的字节数，得到偏移量，然后从头部向后偏移指定数量的字节即可，这样就能在定位到指定字符的同时还保证时间复杂度为 O(1)。 但是这需要一个前提：字符串中每个字符所占的大小必须是相同的，如果字符占的大小不同，比如有的占 1 字节、有的占 3 字节，显然就无法通过指针偏移的方式了。这个时候若还想准确定位的话，只能按顺序对所有字符都逐个扫描，但这样的话时间复杂度肯定不是 O(1)，而是 O(n)。 我们以 Go 为例，Go 字符串默认就是使用的 utf-8 编码。 package main import \"fmt\" func main() { s := \"古明地觉\" fmt.Println(s[2]) // 164 fmt.Println(string(s[2])) // ¤\n} 惊了，我们看到打印的并不是我们希望的结果。因为 Go 底层使用的是 utf-8 编码，不同的字符可能会占用不同的字节。但 Go 通过索引定位的时间复杂度也是 O(1)，所以定位的时候是以字节为单位、而不是字符。在获取的时候也只会获取一个字节，而不是一个字符。 所以 s[2] 在 Go 里面指的是第 3 个字节，而不是第 3 个字符，而汉字在 utf-8 编码下占 3 个字节，所以 s[2] 指的就是汉字古的第三个字节。我们看到打印的时候，该字节的值为 164。 s = \"古明地觉\"\nprint(s.encode(\"utf-8\")[2]) # 164 这就是采用 utf-8 编码带来的弊端，它无法让我们以 O(1) 的时间复杂度去准确地定位字符，尽管它在存储的时候更省内存。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 为什么不使用 utf-8 编码","id":"122","title":"为什么不使用 utf-8 编码"},"123":{"body":"Python 会使用 3 种编码来表示 unicode，所占字节大小分别是 1、2、4 字节。 因此 Python 在创建字符串的时候会先扫描，尝试使用占字节数最少的 Latin-1 编码存储，但是范围肯定有限。如果发现存储不下的字符，只能改变编码，使用 UCS2，然后继续扫描。但如果又发现 UCS2 也无法存储的字符，因为两个字节最多表示 65535 个不同的字符，那么会再次改变编码，使用 UCS4。UCS4 占四个字节，肯定能存下了。 一旦改变编码，字符串中的所有字符都会使用同样的编码，因为它们不具备可变长功能。比如字符串 \"hello 古明地觉\"，肯定都会使用 UCS2，不存在 \"hello \" 使用 Latin-1，\"古明地觉\" 使用 UCS2，因为一个字符串只能有一个编码。 当通过索引获取的时候，会将索引乘上每个字符占的字节数，这样就能跳到准确位置上，因为字符串的所有字符占的字节都是一样的，然后获取的时候也会获取指定的字节数。比如使用 UCS2 编码，那么定位到某个字符的时候，会取两个字节，这样才能表示一个完整的字符。 import sys # 此时全部是 ascii 字符，那么 Latin-1 编码可以存储\n# 所以结构体实例的元数据占 49 个字节\ns1 = \"hello\"\n# 有 5 个字符，一个字符一个字节，所以加一起是 54 个字节\nprint(sys.getsizeof(s1)) # 54 # 出现了汉字，那么 Latin-1 肯定存不下，于是使用 UCS2\n# 所以结构体实例的元数据占 74 个字节\n# 但是别忘了此时的英文字符也是 UCS2，所以也是一个字符两字节\ns2 = \"hello憨\"\n# 6 个字符，74 + 6 * 2 = 86\nprint(sys.getsizeof(s2)) # 86 # 这个牛逼了，UCS2 也存不下，只能 UCS4 存储了\n# 所以结构体实例的元数据占 76 个字节\ns3 = \"hello憨🍌\"\n# 此时所有字符一个占 4 字节，总共 7 个字符\n# 76 + 7 * 4 = 104\nprint(sys.getsizeof(s3)) # 104 除此之外，我们再举一个例子更形象地证明这个现象。 import sys s1 = \"a\" * 1000\ns2 = \"a\" * 1000 + \"🍑\" # 我们看到 s2 只比 s1 多了一个字符\n# 但是两者占的内存，s2 却将近是 s1 的 4 倍。\nprint(sys.getsizeof(s1)) # 1049\nprint(sys.getsizeof(s2)) # 4080 s2 和 s1 的差别只是 s2 比 s1 多了一个字符，但就是这么一个字符导致 s2 比 s1 多占了 3031 个字节。然而这 3031 个字节不可能是多出来的字符所占的大小，什么字符一个会占到三千多个字节，这是不可能的。 尽管如此，它也是罪魁祸首，但前面的 1000 个字符也是共犯。我们说 Python 会根据字符串选择不同的编码，s1 全部是 ASCII 字符，所以 Latin1 能存下，因此一个字符只占一个字节，所以大小就是 49 + 1000 = 1049。 对于 s2，Python 发现前 1000 个字符 Latin1 能存下，但不幸的是最后一个字符存不下，于是只能使用 UCS4。而字符串的所有字符只能有一个编码，为了保证索引查找的时间复杂度为 O(1)，前面一个字节就能存下的字符，也需要用 4 字节来存储，这是 Python 的设计策略。 而使用 UCS4，结构体的元数据会占 76 个字节，因此 s2 的大小就是 76 + 1001 * 4 = 4080。 # 74 + 7 * 2 = 88\n>>> sys.getsizeof(\"爷的青春回来了\") 88 # 76 + 7 * 4 = 104\n>>> sys.getsizeof(\"👴的青春回来了\")\n104 字符数量相同但是占用内存大小不同，相信原因你肯定能分析出来。 所以如果字符串中的所有字符都是 ASCII 字符，则使用 1 字节 Latin1 编码。Latin1 能表示前 256 个 unicode 字符，它支持多种拉丁语，如英语、瑞典语、意大利语、挪威语。但是它们不能存储非拉丁语言，比如汉语、日语、希伯来语、西里尔语。这是因为它们的码点（数字索引）定义在 1 字节（0 ~ 255）范围之外。 大多数自然语言的文字都采用 2 字节（UCS2）编码，但当字符串包含特殊符号、Emoji 或稀有语言时，则使用 4 字节（UCS4）编码。unicode 标准有将近 300 个块（范围），你可以在 0XFFFF 块之后找到 4 字节块。 假设我们有一个 10G 的 ASCII 文本，想把它加载到内存中，但如果在文本中插入一个表情符号，那么字符串的大小将增加 4 倍。这是一个巨大的差异，你可能会在实践当中遇到，比如处理 NLP 问题。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"😁\")) # 128513 所以最著名和最流行的 unicode 编码都是 utf-8，但 Python 不在内部使用它，而是使用 Latin1、UCS2、UCS4。至于原因我们上面已经解释的很清楚了，主要是字符串的索引是基于字符，而不是字节。 当一个字符串使用 utf-8 编码存储时，每个字符会根据自身选择一个合适的大小，这是一种存储效率很高的编码，但它有一个明显的缺点。由于每个字符的字节长度可能不同，就导致无法按照索引瞬间定位到单个字符，即便能定位，也无法定位准确。如果想准，那么只能逐个扫描所有字符。 假设要对使用 utf-8 编码的字符串执行一个简单的操作，比如 s[5]，就意味着解释器需要扫描每一个字符，直到找到需要的字符，这样效率是很低的。但如果是固定长度的编码就没有这样的问题，所以当 Latin1 存储的 \"hello\"，在和 UCS2 存储的 \"古明地觉\" 组合之后，整体每一个字符都会向大的方向扩展，变成 2 字节。 这样定位字符的时候，只需要将 索引 * 2 便可计算出偏移的字节数，然后跳转该字节数即可。但如果原来的 \"hello\" 还是 1字节，而汉字是 2 字节，那么只通过索引是不可能定位到准确字符的，因为不同类型的字符的大小不同，必须要扫描整个字符串才可以。但是扫描字符串，效率又比较低，所以 Python 内部才会使用这个方法，而不是使用 utf-8。 因此对于 Go 来讲，如果想像 Python 一样，那么需要这么做： package main import \"fmt\" func main() { s := \"hello古明地觉\" // 我们看到长度为 17，因为使用 utf-8 编码，并且 len 函数统计的是字节的数量 fmt.Println(s, len(s)) // hello古明地觉 17 // 如果想像 Python 一样，那么可以使用 Go 提供的 rune，相当于 int32 // 此时每个字符均使用 4 个字节，所以长度变成了 9 r := []rune(s) fmt.Println(string(r), len(r)) // hello古明地觉 9 // 虽然打印的内容是一样的，但此时每个字符都使用 4 字节存储 // 此时跳转会偏移 5 * 4 个字节，然后获取也会获取 4 个字节，因为一个字符占 4 个字节 fmt.Println(string(r[5])) // 古\n} 由于 utf-8 编码的 unicode 字符串里面的字符可能占用不同的字节，显然没办法实现 Python 字符串的索引查找效果，因此 Python 没有使用 utf-8 编码。 Python 的做法是让字符串的所有字符都占用相同的字节，先使用占用内存最少的 Latin1，不行的话再使用 UCS2，还不行则使用 UCS4。但不管使用哪种编码，都会确保每个字符占用的字节是一样的。至于原因上面分析的很透彻了，因为无论是索引还是切片，还是计算长度等等，都是基于字符来的，显然这也符合人类的思维习惯。","breadcrumbs":"29. Python 是怎么存储字符串的？ » Latin-1、UCS2、UCS4 该使用哪一种","id":"123","title":"Latin-1、UCS2、UCS4 该使用哪一种"},"124":{"body":"以上就是 Python 字符串的存储策略，它并没有使用最为流行的 utf-8，归根结底就在于这种编码不适合 Python 字符串。当然，我们在将字符串转成字节序列的时候，一般使用的都是 utf-8 编码。 下一篇文章来介绍字符串的底层实现，看看字符串在底层是如何设计的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 小结","id":"124","title":"小结"},"125":{"body":"我们之前提到，字符串采用不同的编码，底层的结构体实例的元数据所占用的内存是不一样的。其实本质上是，字符串会根据编码的不同，而选择不同的存储结构。 PyASCIIObject：字符串仅包含 ASCII 字符； PyCompactUnicodeObject：字符串包含非 ASCII 字符，但可以紧凑表示； PyUnicodeObject：通用结构，可以表达所有类型的字符串（该结构不做讨论）； 需要强调的是，虽然 ASCII 字符占一字节，但只有码点小于 128 的字符才叫 ASCII 字符。 下面我们来分析一下。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 楔子","id":"125","title":"楔子"},"126":{"body":"unicode 会根据编码的不同而分为以下几类。 // Include/cpython/unicodeobject.h\nenum PyUnicode_Kind { // 所有字符的码点均位于 U+0000 ~ U+00FF PyUnicode_1BYTE_KIND = 1, // 所有字符的码点均位于 U+0000 ~ U+FFFF // 且至少有一个大于 U+00FF PyUnicode_2BYTE_KIND = 2, // 所有字符的码点均位于 U+0000 ~ U+10FFFF // 且至少有一个大于 U+FFFF PyUnicode_4BYTE_KIND = 4\n}; 而采用不同的编码，每个字符的大小也是不同的。 // Include/unicodeobject.h\ntypedef uint32_t Py_UCS4;\ntypedef uint16_t Py_UCS2;\ntypedef uint8_t Py_UCS1; Python 有一个内置函数 ord，可以查看字符的码点。 如果码点位于 0 ~ 255，那么使用 Py_UCS1，占 1 字节； 如果码点位于 256 ~ 65535，那么使用 Py_UCS2，占 2 字节； 如果码点大于 65535，那么使用 Py_UCS4，占 4 字节； 通过字符的范围，选择一个最合适的存储单元，从而节省内存。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » unicode 分类","id":"126","title":"unicode 分类"},"127":{"body":"如果字符串只包含 ASCII 字符，即字符的码点均小于 128，那么底层使用 PyASCIIObject 进行存储。 // Include/cpython/unicodeobject.h\ntypedef struct { // 对象的公共头部 PyObject_HEAD // 字符串的长度，充当了 ob_size Py_ssize_t length; // 哈希值，初始为 -1 Py_hash_t hash; struct { // 字符串是否开启 intern 机制，后续介绍 unsigned int interned:2; // 类型，标识每个存储单元的大小，可以有以下几种 // PyUnicode_1BYTE_KIND // PyUnicode_2BYTE_KIND // PyUnicode_4BYTE_KIND unsigned int kind:3; // 字符串是否紧凑表示，它是针对内存分配方案而言的 /* 紧凑的字符串由 PyASCIIObject 和 PyCompactUnicodeObject 表示 它的特点是对象和文本缓冲区是结合的，只需要一个内存块 */ /* 非紧凑的字符串由 PyUnicodeObject 表示（不是本文的重点） 它的特点是对象和文本缓冲区是分离的，需要两个内存块 一个负责存储 PyUnicodeObject 对象，另一个负责存储文本缓冲区 */ unsigned int compact:1; // 字符串是否只包含 ASCII 字符，如果是则为 1, 否则为 0 // 虽然一个字节可表示的范围是 0 ~ 255，但只有 0 ~ 127 之间的才是 ASCII 字符 unsigned int ascii:1; // 对象布局是否已完全初始化，不用关注 unsigned int ready:1; // 注意上面的字段名后面跟着 :数字，这是 C 语言的位域 // 比如 interned:2 表示使用 unsigned int 的前 2 个位 // 所以 struct state 结构体总共占 4 字节，因为所有字段共用 4 字节内存 // 上面总共使用了 8 个位，显然这里的 :24 负责占满 32 个位 unsigned int :24; } state; // 缓存宽字符格式（wide character）的字符串，无需关注，在之后的版本会被移除 wchar_t *wstr;\n} PyASCIIObject; 那么问题来了，实际的字符串文本数据存在了什么地方，我们没看到结构体里面有哪个字段负责存储文本啊。答案很简单，字符串文本会直接跟在 PyASCIIObject 结构体实例的后面，也就是紧凑表示。 我们以字符串 \"miu\" 为例，看一下它的底层结构。 注：为优化内存访问效率，结构体字段会进行内存对齐，所以 state 后面会多出一个 4 字节的空洞。 再来分析一下为什么一个空字符串会占 49 个字节，因为 ob_refcnt、ob_type、length、hash、wstr 都是 8 字节，加起来 40 字节。而 state 是 4 字节，但又留下了 4 字节的空洞，加起来也是 8 字节，所以总共占 40 + 8 = 48 个字节。然后还有一个 '\\0'，所以还要加上一个 1，总共 49 字节。 而对于 \"miu\" 这个 unicode 字符串来说，占的总字节数就是 49 + 3 = 52。 >>> import sys\n>>> sys.getsizeof(\"abc\")\n52 当字符串只包含 ASCII 字符时，由 PyASCIIObject 结构体表示，大小等于 49 + 字符串长度。当然啦，我们也可以认为大小等于 48 + (字符串长度 + 1)，这样理解起来更直观一些。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyASCIIObject","id":"127","title":"PyASCIIObject"},"128":{"body":"如果字符串包含了非 ASCII 字符，那么由 PyCompactUnicodeObject 结构体表示，假设字符串中码点最大的字符的码点为 maxchar。 if maxchar < 128: struct = PyASCIIObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 1\nelif maxchar < 256: struct = PyCompactUnicodeObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 0\nelif maxchar < 65536: struct = PyCompactUnicodeObject kind = PyUnicode_2BYTE_KIND # 2 ascii = 0\nelse: struct = PyCompactUnicodeObject kind = PyUnicode_4BYTE_KIND # 4 ascii = 0 看一下 PyCompactUnicodeObject 的底层结构。 // Include/cpython/unicodeobject.h\ntypedef struct { PyASCIIObject _base; // 字符串的 utf-8 编码长度 Py_ssize_t utf8_length; // 字符串使用 utf-8 编码的结果，这里是缓存起来从而避免重复的编码运算 char *utf8; // 宽字符的数量 Py_ssize_t wstr_length;\n} PyCompactUnicodeObject; PyCompactUnicodeObject 相当于在 PyASCIIObject 的基础上增加了 3 个字段，那么它实例的大小是多少呢？由于新增的三个字段，每个都是 8 字节，并且字符串文本会紧跟在 PyCompactUnicodeObject 的后面，所以大小一目了然。 PyCompactUnicodeObject 实例的大小等于 48 + 24 + (字符串长度 + 1) * 每个字符的大小，即 72 + (字符串长度 + 1) * 每个字符的大小 因此以后在看到一个字符串时，我们可以很轻松地计算出它的大小。 import sys\n# 只包含 ASCII 字符，那么结构体使用 PyASCIIObject\n# 这样的字符串所占的内存大小为 48 + (字符串长度 + 1)\nonly_ascii = \"satori\"\n# 所以结果是 48 + (6 + 1) = 55 字节\nprint(sys.getsizeof(only_ascii))\n\"\"\"\n55\n\"\"\" # 包含非 ASCII 字符，结构体使用 PyCompactUnicodeObject\n# 但所有字符的码点均小于 256，因此编码仍使用 Py_UCS1\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1)\nnon_ascii_with_ucs1 = \"sator¡\"\n# 所以结果是 72 + (6 + 1) = 79 字节\nprint(sys.getsizeof(non_ascii_with_ucs1))\n\"\"\"\n79\n\"\"\" # 字符的码点达到了 256，但小于 65536，因此编码使用 Py_UCS2\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 2\n# 注意：因为编码使用 Py_UCS2，那么 \\0 也要占两个字节\nnon_ascii_with_ucs2 = \"憨pi\"\n# 所以结果是 72 + (3 + 1) * 2 = 80\nprint(sys.getsizeof(non_ascii_with_ucs2))\n\"\"\"\n80\n\"\"\" # 字符的码点达到了 65536，因此编码使用 Py_UCS4\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 4\n# 因为编码使用 Py_UCS4，那么 \\0 也要占 4 个字节\nnon_ascii_with_ucs4 = \"🍌君\"\n# 所以结果是 72 + (2 + 1) * 4 = 84\nprint(sys.getsizeof(non_ascii_with_ucs4))\n\"\"\"\n84\n\"\"\" 所以随着编码的不同，一个 Python 字符串的元数据（包含 '\\0'）会占据不同的大小，假设字符串中码点最大的字符的码点为 maxchar。 如果 maxchar < 128，那么采用 Latin-1 编码，结构体为 PyASCIIObject，元数据的大小为 48 + 1 = 49。 如果 128 <= maxchar < 256，那么采用 Latin-1 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 1 = 73。 如果 256 <= maxchar < 65536，那么采用 USC2 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 2 = 74。 如果 maxchar >= 65536，那么采用 USC4 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 4 = 76。 所以我们之前说根据编码的不同，字符串的额外部分可能占据 49、74、76字节，这个结论其实不够准确，还漏掉了一个 73。因为 128 <= maxchar < 256 的字符串虽然不是 ASCII 字符串，但它仍然使用 Latin-1 编码，所以 '\\0' 占的是 1 字节，而不是 2 字节和 4 字节。 下面通过画图来描述一下这几个字符串的底层结构，由于 ASCII 字符串已经说过了，这里就不再赘述了。 non_ascii_with_ucs1 = \"sator¡\" 注意结尾的是字符 ¡，不是 i。 每个字符占一字节，所以大小是 72 + 7= 79 字节，然后 kind 为 PyUnicode_1BYTE_KIND。 import sys print(sys.getsizeof(\"sator¡\")) # 79 只有所有的字符的码点都小于 128，才叫 ASCII 字符串。而 ¡ 的码点是 161，所以 \"sator¡\" 不是 ASCII 字符串，但它的每个字符仍然只需一个字节存储。 non_ascii_with_ucs2 = \"憨pi\" 每个字符占两字节，所以大小是 72 + 4 * 2 = 80 字节，然后 kind 为 PyUnicode_2BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"憨pi\"))\n80 non_ascii_with_ucs4 = \"🍌君\" 每个字符占四字节，所以大小是 72 + 3 * 4 = 84 字节，然后 kind 为 PyUnicode_4BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"🍌君\"))\n84 以上我们就讨论了不同编码的字符串的底层结构，以及内存计算方式。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyCompactUnicodeObject","id":"128","title":"PyCompactUnicodeObject"},"129":{"body":"我们再来看一下解释器是怎么为字符串申请内存的，这个过程会调用 PyUnicode_New 函数。 该函数接收一个 size 参数和 maxchar 参数，负责申请容纳 size 个字符的 unicode 对象。而 maxchar 表示所有字符的码点中最大的那一个，对象的每个字符占多大空间，则基于 maxchar 进行判断。 // Objects/unicodeobject.c PyObject *\nPyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)\n{ // 声明相关变量 PyObject *obj; PyCompactUnicodeObject *unicode; void *data; enum PyUnicode_Kind kind; int is_sharing, is_ascii; Py_ssize_t char_size; Py_ssize_t struct_size; // 如果 size 为 0，返回空字符串，注：空字符串是单例的 if (size == 0 && unicode_empty != NULL) { Py_INCREF(unicode_empty); return unicode_empty; } is_ascii = 0; is_sharing = 0; struct_size = sizeof(PyCompactUnicodeObject); // 如果 maxchar 小于 128，说明全部是 ASCII 字符 // 此时结构体使用 PyASCIIObject if (maxchar < 128) { kind = PyUnicode_1BYTE_KIND; // kind 为 1 char_size = 1; // 字符大小为 1 is_ascii = 1; // 是 ASCII 字符串 struct_size = sizeof(PyASCIIObject); // 结构体大小 } // 否则说明字符串包含非 ASCII 字符，那么 is_ascii 为 0 // 此时结构体一律使用 PyCompactUnicodeObject else if (maxchar < 256) { // 如果 maxchar 小于 256，那么 kind 依旧为 1，字符大小为 1 kind = PyUnicode_1BYTE_KIND; char_size = 1; } else if (maxchar < 65536) { // 如果 maxchar 小于 65536，那么 kind 为 2，字符大小为 2 kind = PyUnicode_2BYTE_KIND; char_size = 2; if (sizeof(wchar_t) == 2) is_sharing = 1; } else { // 否则说明要采用 4 字节存储，此时 kind 为 4，字符大小为 4 // 注意：maxchar 也是有范围的，不能超过 0x10ffff // 不过目前也没有哪个字符的码点能超过这个值 if (maxchar > MAX_UNICODE) { PyErr_SetString(PyExc_SystemError, \"invalid maximum character passed to PyUnicode_New\"); return NULL; } kind = PyUnicode_4BYTE_KIND; char_size = 4; if (sizeof(wchar_t) == 4) is_sharing = 1; } // size 不能小于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyUnicode_New\"); return NULL; } // (size + 1) * char_size + struct_size 不能超过 PY_SSIZE_T_MAX if (size > ((PY_SSIZE_T_MAX - struct_size) / char_size - 1)) return PyErr_NoMemory(); // 为 Unicode 对象申请内存，如果返回 NULL 则说明申请失败 // 申请的内存不仅包含结构体本身，还有 size + 1 个字符，每个字符大小为 char_size // 从这里就体现出 \"紧凑\" 的含义了，因为结构体和字符串文本是结合的 obj = (PyObject *) PyObject_MALLOC(struct_size + (size + 1) * char_size); if (obj == NULL) return PyErr_NoMemory(); // 初始化引用计数和类型 obj = PyObject_INIT(obj, &PyUnicode_Type); if (obj == NULL) return NULL; // 将 obj 转成 PyCompactUnicodeObject * unicode = (PyCompactUnicodeObject *)obj; // 注：存储字符串文本的内存（可以理解为一个数组）紧跟在结构体后面 // 而下面的变量 data 会指向数组的首元素 // 那么问题来了，这是怎么做到的呢？我们解释一下，顺便回顾一下 C 的指针 // 假设有一个 int * 类型的指针 a，即 a 指向一个 int // 而 C 指针是可以运算的，a + 1 会指向下一个 int // 当然更准确的说，a + 1 会向后偏移 sizeof(int) 个字节 // 同理，如果 a 的类型是 ssize_t *，那么 a + 1 会向后偏移 sizeof(ssize_t) 个字节 if (is_ascii) // 此时我们就知道这里的代码是做什么的了，如果 is_ascii 等于 1 // 说明结构体是 PyASCIIObject，将泛型指针 obj 转成 PyASCIIObject * // 加 1 之后会向后偏移 sizeof(PyASCIIObject) 个字节 // 正好指向跟在 PyASCIIObject 结构体实例尾部的首个字符 data = ((PyASCIIObject*)obj) + 1; else // 否则说明结构体是 PyCompactUnicodeObject // 那么 unicode + 1 之后会向后偏移 sizeof(PyCompactUnicodeObject) 个字节 // 同样指向跟在 PyCompactUnicodeObject 结构体实例尾部的首个字符 data = unicode + 1; // 将 length 字段设置为 size _PyUnicode_LENGTH(unicode) = size; // 将 hash 字段初始化为 -1 _PyUnicode_HASH(unicode) = -1; // 将 state.interned 字段设置为 0 _PyUnicode_STATE(unicode).interned = 0; // 将 state.kind 字段设置为 kind _PyUnicode_STATE(unicode).kind = kind; // 将 state.compact 字段设置为 1 _PyUnicode_STATE(unicode).compact = 1; // 将 state.ready 字段设置为 1 _PyUnicode_STATE(unicode).ready = 1; // 将 state.ascii 字段设置为 is_ascii _PyUnicode_STATE(unicode).ascii = is_ascii; // 如果 is_ascii 等于 1，即字符串为 ASCII 字符串 // 将字符数组索引为 size 的元素设置为 '\\0' if (is_ascii) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; } // 否则说明结构体是 PyCompactUnicodeObject，还要多初始化两个字段 // 将 utf8 设置为 NULL，将 utf8_length 设置为 0 else if (kind == PyUnicode_1BYTE_KIND) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; _PyUnicode_WSTR_LENGTH(unicode) = 0; unicode->utf8 = NULL; unicode->utf8_length = 0; } // 结构体是 PyCompactUnicodeObject，并且 kind 不等于 PyUnicode_1BYTE_KIND else { unicode->utf8 = NULL; unicode->utf8_length = 0; // 如果 kind 等于 PyUnicode_2BYTE_KIND，说明每个字符要占 2 字节 // 将 data 转成 Py_UCS2 *，此时会用两个字节存储 '\\0' if (kind == PyUnicode_2BYTE_KIND) ((Py_UCS2*)data)[size] = 0; // 否则说明 kind 等于 PyUnicode_4BYTE_KIND，每个字符要占 4 字节 // 将 data 转成 Py_UCS4 *，此时会用四个字节存储 '\\0' else ((Py_UCS4*)data)[size] = 0; if (is_sharing) { _PyUnicode_WSTR_LENGTH(unicode) = size; _PyUnicode_WSTR(unicode) = (wchar_t *)data; } else { _PyUnicode_WSTR_LENGTH(unicode) = 0; _PyUnicode_WSTR(unicode) = NULL; } }\n#ifdef Py_DEBUG unicode_fill_invalid((PyObject*)unicode, 0);\n#endif assert(_PyUnicode_CheckConsistency((PyObject*)unicode, 0)); // 最后返回泛型指针 PyObject * return obj;\n} 通过字符串的内存申请，我们应该对底层结构有了更深刻的认识，说白了就是采用不同的编码，每个字符占用不同数量的字节。 另外 PyUnicode_New 主要负责申请内存，包括结构体本身以及指定数量的字符，至于具体的字符是什么则不得而知。因此 PyUnicode_New 一般会被其它 API 调用，当调用 PyUnicode_New 申请完内存之后，再对字符数组初始化。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 字符串的内存申请","id":"129","title":"字符串的内存申请"},"13":{"body":"在前面的文章中我们说到，面向对象理论中的类和对象这两个概念在 Python 内部都是通过对象实现的。类是一种对象，称为类型对象，类实例化得到的也是对象，称为实例对象。但是对象在 Python 的底层是如何实现的呢？Python 解释器是基于 C 语言编写的 ，但 C 并不是一个面向对象的语言，那么它是如何实现 Python 的面向对象的呢？ 首先对于人的思维来说，对象是一个比较形象的概念，但对于计算机来说，对象却是一个抽象的概念。它并不能理解这是一个整数，那是一个字符串，计算机所知道的一切都是字节。通常的说法是：对象是数据以及基于这些数据所能进行的操作的集合。在计算机中，一个对象实际上就是一片被分配的内存空间，这些内存可能是连续的，也可能是离散的。 而 Python 的任何对象在 C 中都对应一个结构体实例，在 Python 中创建一个对象，等价于在 C 中创建一个结构体实例。所以 Python 的对象，其本质就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。 下面我们就来分析一下对象在 C 中是如何实现的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 楔子","id":"13","title":"楔子"},"130":{"body":"以上就是字符串的底层结构，虽然字符串作为最基础的数据结构被大量使用，但它的底层实现却并不简单。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 小结","id":"130","title":"小结"},"131":{"body":"上一篇文章我们介绍了字符串的底层结构，看到里面有一个 state 字段，该字段也是一个结构体，内部定义了很多的标志位。 如果字符串的 interned 标志位大于 0，那么虚拟机将为其开启 intern 机制。那什么是 intern 机制呢？在 Python 中，某些字符串也可以像小整数对象池里的整数一样，共享给所有变量使用，从而通过避免重复创建来降低内存使用、减少性能开销，这便是 intern 机制。 Python 的做法是在虚拟机内部维护一个全局字典，所有开启 intern 机制的字符串均会保存在这里，后续如果需要使用的话，会尝试在全局字典中获取，从而实现避免重复创建的功能。 另外 intern 机制也分为多种。 // Include/cpython/unicode.h\n#define SSTATE_NOT_INTERNED 0\n#define SSTATE_INTERNED_MORTAL 1\n#define SSTATE_INTERNED_IMMORTAL 2 解释一下这几个字段： SSTATE_NOT_INTERNED：字符串未开启 intern 机制； SSTATE_INTERNED_MORTAL：字符串开启了 intern 机制，但它不是永久驻留的，在某些情况下可能会被回收； SSTATE_INTERNED_IMMORTAL：字符串开启了 intern 机制，会永远存活于内存中； 这些字段定义了字符串在内存管理中的不同驻留状态，从未驻留、短暂驻留到永久驻留，帮助优化字符串的内存使用和管理。 而当一个字符串要开启 intern 机制时，会调用 PyUnicode_InternInPlace 函数，看一下它的逻辑。 // Objects/unicodeobject.c void\nPyUnicode_InternInPlace(PyObject **p)\n{ PyObject *s = *p; PyObject *t; // 类型检查，因为 intern 共享机制只能用在字符串对象上 // PyUnicode_Check(s) -> isinstance(s, str) // PyUnicode_CheckExact(s) -> type(s) is str if (s == NULL || !PyUnicode_Check(s)) return; if (!PyUnicode_CheckExact(s)) return; // 执行到这儿，说明 s 一定指向字符串，那么检测它是否已经开启了 intern 机制 // 这个函数的逻辑很简单，内部会获取 state.interned，看它是否大于 0 // 如果已经被 intern 机制处理了，那么直接返回 if (PyUnicode_CHECK_INTERNED(s)) return; // 所有开启 intern 机制的字符串，都会保存在 interned 字典中 // 如果 interned 字典为空，那么创建 if (interned == NULL) { interned = PyDict_New(); if (interned == NULL) { PyErr_Clear(); /* Don't leave an exception */ return; } } // 将字符串同时作为 key 和 value 保存在 interned 字典中，即开启 intern 机制 // PyDict_SetDefault 对应字典的 setdefault 方法 t = PyDict_SetDefault(interned, s, s); if (t == NULL) { PyErr_Clear(); return; } // 注意这里有一个让人混淆的地方，首先 t 和 s 都是 C 指针 // 如果 t != s，说明它们指向了不同的字符串，如果 t == s，说明它们指向的是同一个字符串 // 由于 s 同时作为 key 和 value，那么不管 s 指向的字符串是否在字典中已存在 // PyObject_RichCompare(t, s, Py_EQ) 永远为真，也就是 t 和 s 指向的字符串的值是相等的 // 只是当 t != s 时，说明它们指向的不是同一个字符串，但值相等 // 这也意味着字典中已经存在某个 key，它指向的字符串维护了相同的文本数据 // 那么增加 t 指向的字符串的引用计数，减少 s 指向的字符串的引用计数 if (t != s) { Py_INCREF(t); Py_SETREF(*p, t); return; } // 否则说明 t == s，即 s 在字典中不存在，那么开启 interned 机制 Py_REFCNT(s) -= 2; _PyUnicode_STATE(s).interned = SSTATE_INTERNED_MORTAL;\n} 估计很多人都以为 Python 在创建字符串时，会先检测该字符串是否已经存在，如果有，就不用创建新的，这样可以节省空间。但其实不是这样的，事实上节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。 对于任何一个字符串，Python 总是会为它申请内存，尽管创建出来的字符串在 interned 字典中已经存在了（有另外的字符串对象维护了相同的文本）。而这正是关键所在，通常 Python 在运行时创建了一个字符串对象（假设叫 temp）之后，基本上都会调用 PyUnicode_InternInPlace 对 temp 进行处理。 如果维护的值已经存在于 interned 字典中，那么 temp 指向的对象的引用计数就会减 1，然后会因引用计数为 0 而被销毁，只是昙花一现，然后归于湮灭。 所以现在我们就明白了 intern 机制，并不是说先判断是否存在，如果存在，就不创建。而是先创建，然后发现已经有其它的字符串维护了一个与之相同的文本数据，于是 intern 机制再将引用计数减一，导致引用计数为 0，最终被回收。 然后关于字符串对象的 intern 机制，还有一点需要注意。实际上，被 intern 机制处理过后的字符串分为两类，一类处于 SSTATE_INTERNED_IMMORTAL 状态，另一类处于 SSTATE_INTERNED_MORTAL 状态，这两种状态的区别在 unicode_dealloc 中可以清晰的看到。SSTATE_INTERNED_IMMORTAL 状态的字符串是永远不会被销毁的，它与解释器共存亡。 而 PyUnicode_InternInPlace 只能创建 SSTATE_INTERNED_MORTAL 的字符串对象，如果想创建 SSTATE_INTERNED_IMMORTAL 对象，必须通过另外的接口来强制改变 intern 状态。 void\nPyUnicode_InternImmortal(PyObject **p)\n{ PyUnicode_InternInPlace(p); if (PyUnicode_CHECK_INTERNED(*p) != SSTATE_INTERNED_IMMORTAL) { _PyUnicode_STATE(*p).interned = SSTATE_INTERNED_IMMORTAL; Py_INCREF(*p); }\n} 但是问题来了，什么样的字符串才会开启 intern 机制呢？ 1）如果字符串为 ASCII 字符串，并且长度不超过 4096，那么会开启 intern 机制。 >>> s1 = \"a\" * 4096\n>>> s2 = \"a\" * 4096\n# 会开启 intern 机制，s1 和 s2 指向同一个字符串\n>>> s1 is s2\nTrue # 长度超过了 4096，所以不会开启 intern 机制\n>>> s1 = \"a\" * 4097\n>>> s2 = \"a\" * 4097\n>>> s1 is s2\nFalse 2）如果一个字符串只有一个字符，并且码点小于 256（一个字节可以表示），那么也会开启 intern 机制。 >>> hex(128)\n'0x80'\n# s1 和 s2 指向同一个字符串，因为开启了 intern 机制\n>>> s1 = chr(128)\n>>> s2 = \"\\x80\"\n>>> s1 is s2\nTrue # ASCII 字符指的是码点小于 128 的字符，显然 s1 和 s2 不是 ASCII 字符串\n# 虽然码点小于 256，但长度不等于 1，所以不会开启 intern 机制\n>>> s1 = chr(128) + \"x\"\n>>> s2 = chr(128) + \"x\"\n>>> s1 is s2\nFalse 实际上，存储单个字符这种方式有点类似于 bytes 对象的缓存池。是的，正如整数有小整数对象池、bytes 对象有字符缓存池一样，字符串也有其对应的缓存池。 总之 intern 机制并不是大家想的那样：先检测字符串是否已经存在，如果有，就不用创建新的，从而节省内存。但其实不是这样的，节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。对于任何一个字符串，解释器总是会为它创建对应的结构体实例，但如果发现创建出来的实例在 intern 字典中已经存在了，那么再将它销毁。 最后关于 intern 机制，在 Python 里面可以通过 sys.intern 函数强制开启。 >>> s1 = \"憨pi-_-||\"\n>>> s2 = \"憨pi-_-||\"\n>>> s1 is s2\nFalse\n>>> >>> s1 = sys.intern(\"憨pi-_-||\")\n>>> s2 = sys.intern(\"憨pi-_-||\")\n>>> s1 is s2\nTrue 以上就是字符串的 intern 机制，下一篇文章来介绍字符串的相关操作是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"31. 字符串的 intern 机制是怎么一回事？","id":"131","title":"31. 字符串的 intern 机制是怎么一回事？"},"132":{"body":"本文来说一说字符串的操作，字符串支持哪些操作，取决于类型对象 str，所以我们来看看 str 在底层的定义。 // Objects/unicodeobject.c\nPyTypeObject PyUnicode_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"str\", /* tp_name */ sizeof(PyUnicodeObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* Slots */ (destructor)unicode_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ unicode_repr, /* tp_repr */ &unicode_as_number, /* tp_as_number */ &unicode_as_sequence, /* tp_as_sequence */ &unicode_as_mapping, /* tp_as_mapping */ // ...\n} bytes 对象和 str 对象的很多行为都是相似的，str 对象可以 encode 成 bytes 对象，bytes 对象可以 decode 成 str 对象。 看一下三个操作簇，字符串都支持，但根据 bytes 对象的经验，我们猜测 tp_as_number 里面实现的函数只有取模，也就是格式化。 // Objects/unicodeobject.c // 不出所料，只实现了一个取模\nstatic PyNumberMethods unicode_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ unicode_mod, /*nb_remainder*/\n}; // 我们看到和 bytes 对象是几乎一样的\n// 因为 str 对象和 bytes 都是不可变的变长对象，并且可以相互转化\n// 因此它们的行为是高度相似的\nstatic PySequenceMethods unicode_as_sequence = { (lenfunc) unicode_length, /* sq_length */ PyUnicode_Concat, /* sq_concat */ (ssizeargfunc) unicode_repeat, /* sq_repeat */ (ssizeargfunc) unicode_getitem, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyUnicode_Contains, /* sq_contains */\n}; //也和 bytes 对象一样\nstatic PyMappingMethods unicode_as_mapping = { (lenfunc)unicode_length, /* mp_length */ (binaryfunc)unicode_subscript, /* mp_subscript */ (objobjargproc)0, /* mp_ass_subscript */\n}; 下面我们就通过源码来考察一下。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 楔子","id":"132","title":"楔子"},"133":{"body":"获取字符串的长度会执行 unicode_length 函数。 // Objects/unicodeobject.c\nstatic Py_ssize_t\nunicode_length(PyObject *self)\n{ if (PyUnicode_READY(self) == -1) return -1; return PyUnicode_GET_LENGTH(self);\n} // Include/cpython/unicodeobject.h\n#define PyUnicode_GET_LENGTH(op) \\ (assert(PyUnicode_Check(op)), \\ assert(PyUnicode_IS_READY(op)), \\ ((PyASCIIObject *)(op))->length) 比较简单，没什么可说的，length 字段维护的是字符串的长度。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 获取字符串的长度","id":"133","title":"获取字符串的长度"},"134":{"body":"字符串相加会执行 PyUnicode_Concat 函数，将两个字符串组合成一个新的字符串。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Concat(PyObject *left, PyObject *right)\n{ // 参数 left 和 right 指向两个要相加的字符串 // result 则指向相加之后的字符串 PyObject *result; // 还记得这个 Py_UCS4 吗，它是一个无符号 32 位整型 Py_UCS4 maxchar, maxchar2; // left 的长度、right 的长度、相加之后的长度 Py_ssize_t left_len, right_len, new_len; // 必须是两个字符串相加 if (ensure_unicode(left) < 0) return NULL; if (!PyUnicode_Check(right)) { PyErr_Format(PyExc_TypeError, \"can only concatenate str (not \\\"%.200s\\\") to str\", right->ob_type->tp_name); return NULL; } if (PyUnicode_READY(right) < 0) return NULL; // 如果 left 指向空字符串，直接返回 right if (left == unicode_empty) return PyUnicode_FromObject(right); // 如果 right 指向空字符串，直接返回 left if (right == unicode_empty) return PyUnicode_FromObject(left); // 获取两个字符串的长度 left_len = PyUnicode_GET_LENGTH(left); right_len = PyUnicode_GET_LENGTH(right); // 如果相加的之后的长度超过了 PY_SSIZE_T_MAX，那么报错 if (left_len > PY_SSIZE_T_MAX - right_len) { PyErr_SetString(PyExc_OverflowError, \"strings are too large to concat\"); return NULL; } // 计算相加之后的字符串的长度 new_len = left_len + right_len; // 解释一下 PyUnicode_MAX_CHAR_VALUE，它的逻辑很简单 /* 如果是 ASCII 字符串，返回 0x7f * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0xff * 如果 kind 等于 PyUnicode_2BYTE_KIND，返回 0xffff * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0x10ffff */ // 所以该函数计算的就是字符串使用的编码所能表示的最大范围 maxchar = PyUnicode_MAX_CHAR_VALUE(left); maxchar2 = PyUnicode_MAX_CHAR_VALUE(right); // 显然要取 maxchar 和 maxchar2 之间两者较大的那一个 maxchar = Py_MAX(maxchar, maxchar2); // PyUnicode_New 我们之前介绍过，它负责为字符串申请内存 // new_len 表示要容纳多少个字符 // maxchar 表示字符的最大码点，内部会基于 maxchar 选择一个合适的编码 result = PyUnicode_New(new_len, maxchar); if (result == NULL) return NULL; // _PyUnicode_FastCopyCharacters 负责字符串之间的拷贝，它的原型如下： /* void _PyUnicode_FastCopyCharacters(PyObject *to, Py_ssize_t to_start, PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many) 如果用 Python 代码举例的话，那么该函数所做的事情就等价于如下： for i in range(how_many): to[to_start + i] = from[from_start + i] */ // 相当于 result[0: left_len] = left[0: left_len] _PyUnicode_FastCopyCharacters(result, 0, left, 0, left_len); // 相当于 result[left_len: left_len + right_len] = right[0: right_len] _PyUnicode_FastCopyCharacters(result, left_len, right, 0, right_len); assert(_PyUnicode_CheckConsistency(result, 1)); return result;\n} 可以看到逻辑还是很清晰的，不过和 bytes 对象不同，字符串没有实现缓冲区。但是在操作上，和 bytes 对象是类似的，如果有大量的字符串相加，那么效率会非常低下，官方建议是通过 join 的方式。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的相加","id":"134","title":"字符串的相加"},"135":{"body":"序列型对象除了拥有 tp_as_sequence 里面的方法之外，还可以有很多自定义方法，比如字符串可以转大小写，列表可以追加元素等等。下面来聊一聊字符串的自定义方法，在介绍类型对象的时候说过，实例对象的自定义方法都会放在类型对象的 tp_methods 字段里面。 tp_methods 字段的类型是 PyMethodDef 结构体数组，一个 PyMethodDef 结构体实例对应一个可调用方法。那么 PyMethodDef 长什么样子呢？ // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 包含具体实现的 C 函数 PyCFunction ml_meth; // 函数的参数类型 // 比如函数接收多少参数，是否支持关键字参数， // 是不是静态方法、类方法等等，这些都需要通过 ml_flags 指定 int ml_flags; // 函数的 docstring const char *ml_doc; }; 字符串的自定义方法非常多，我们先从 Python 的角度罗列一下，然后再挑几个看一下源码实现。 # 字符串转小写\nprint(\"ABC\".lower()) # abc # 字符串转大写\nprint(\"abc\".upper()) # ABC # 每个单词首字母大写，其它字母小写\nprint(\"my GRIL\".title()) # My Gril # 第一个单词首字母大写，其它字母小写\nprint(\"MY GIRL\".capitalize()) # My girl # 从字符两端开始去除指定的字符，比如位于 \"001\" 的字符会被去除\nprint(\"001古明地觉 1 号001\".strip(\"001\")) # 古明地觉 1 号\n# 也可以只从一端去除\nprint(\"001古明地觉 1 号001\".lstrip(\"001\")) # 古明地觉 1 号001\nprint(\"001古明地觉 1 号001\".rstrip(\"001\")) # 001古明地觉 1 号 # 查找指定的子串，返回子串第一次出现的位置\nprint(\"abcabcabc\".index(\"bca\")) # 1\n# 查找时也支持指定范围，比如从索引为 2 的位置开始查找\nprint(\"abcabcabc\".index(\"bca\", 2)) # 4 # index 方法如果在没有找到指定的子串时，会抛出 ValueError:\n# 如果不希望报错，那么可以使用 find，当字符串不存在时会返回 -1\nprint(\"hello\".find(\"ll\")) # 2\nprint(\"hello\".find(\"lll\")) # -1\n# find 也支持指定查找范围，并且是从左往右查找\n# 如果使用 rfind，则可以实现从右往左查找，同理还有 rindex\nprint(\"abc abc\".find(\"abc\")) # 0\nprint(\"abc abc\".rfind(\"abc\")) # 4 # 统计指定子串的数量\nprint(\"abc abc abc\".count(\"abc\")) # 3 # 是否以某个字符串开头\nprint(\"Hello\".startswith(\"Hel\")) # True\nprint(\"Hello\".startswith(\"hel\")) # False # 是否以某个字符串结尾\nprint(\"world\".endswith(\"rld\")) # True\nprint(\"world\".endswith(\"rlD\")) # False # 按照指定字符串进行分割，并支持传入 maxsplit 参数指定最大分割次数\nprint(\"a-b-c-d-e\".split(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".split(\"-\", 2)) # ['a', 'b', 'c-d-e']\n# 如果不传递参数，那么会默认按照空白符（包含空格、Tab、换行等等）分隔\nprint(\"a \\n b \\tc\".split()) # ['a', 'b', 'c']\n# 还可以从右向左分割，当然在不指定 maxsplit 参数时，效果和 split 一样\nprint(\"a-b-c-d-e\".rsplit(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".rsplit(\"-\", 2)) # ['a-b-c', 'd', 'e'] # 等价于 .split(\"\\n\")\nprint(\"a b\\nc\".splitlines()) # ['a b', 'c'] # 按照指定子串进行分割，返回一个三元组：(子串之前的部分, 子串, 子串之后的部分)\nprint(\"abcxxdef\".partition(\"xx\")) # ('abc', 'xx', 'def')\n# 当子串不存在时，会返回 (字符串本身, \"\"， \"\")\nprint(\"abc\".partition(\"xx\")) # ('abc', '', '') # 大小写交换\nprint(\"Hello World\".swapcase()) # hELLO wORLD # 对指定子串进行替换\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\")) # ABC ABC ABC\n# 也可以指定最大替换次数\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\", 2)) # ABC ABC abc # 和 replace 作用相似，也是用来替换字符串指定部分\n# 将 a 替换成 abc，将 x 替换成 xyz\ntrans = str.maketrans({\"a\": \"abc\", \"x\": \"xyz\"})\nprint(\"aaxx\".translate(trans)) # abcabcxyzxyz\n# 如果给 str.maketrans 只传一个参数，那么要传字典，并且 key 必须是单字符\n# 如果给 str.maketrans 传递两个参数，那么两个参数必须是等长的字符串\ntrans = str.maketrans(\"abc\", \"ABC\")\n# a -> A，b -> B，c -> C\nprint(\"abccc\".translate(trans)) # ABCCC\n# 如果传三个参数，那么第三个参数也要是字符串\n# 此时在替换的时候，还会去除掉位于 \"def\" 中的字符\ntrans = str.maketrans(\"abc\", \"ABC\", \"def\")\nprint(\"abcdefabc\".translate(trans)) # ABCABC 这些都属于基础内容了，我们挑几个看一下源码实现。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的自定义方法","id":"135","title":"字符串的自定义方法"},"136":{"body":"字符串在相加时会创建一个新的字符串，所以如果有大量的字符串相加，那么效率会很低下。面对这种情况，官方的建议是通过 join 方法。 字符串的 join 方法在底层对应 PyUnicode_Join 函数。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Join(PyObject *separator, PyObject *seq)\n{ PyObject *res; // 拼接结果 PyObject *fseq; // 拼接的字符串的数量 Py_ssize_t seqlen; // 总长度 PyObject **items; // PyObject * 数组首元素的地址 // 遍历参数 seq，将里面的每个字符串拿出来放在列表中 // 如果 seq 本身就是列表或元组，那么直接返回 seq fseq = PySequence_Fast(seq, \"can only join an iterable\"); if (fseq == NULL) { return NULL; } // 列表或元组对应的结构体内部都有一个 ob_item 字段 // 该字段是一个 PyObject * 类型的数组，负责保存具体的元素 // 该函数会拿到 ob_item 数组，并赋值给 items items = PySequence_Fast_ITEMS(fseq); // 获取要拼接的字符串的数量 seqlen = PySequence_Fast_GET_SIZE(fseq); // 调用 _PyUnicode_JoinArray 进行拼接 res = _PyUnicode_JoinArray(separator, items, seqlen); Py_DECREF(fseq); return res;\n} 核心在 _PyUnicode_JoinArray 函数里面，该函数的逻辑很长，但很简单。就是获取要拼接的每一个字符串的长度，然后加在一起，并取最大的存储单元，然后一次性申请对应的内存空间，再逐一进行拷贝。所以拷贝是避免不了的，+ 这种方式导致低效率的主要原因就在于大量临时字符串的创建和销毁。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 join","id":"136","title":"字符串的 join"},"137":{"body":"在 Python 里面可以调用字符串的 encode 方法，得到 bytes 对象。那么它在底层是如何实现的呢？ // Objects/unicodeobject.c\nPyObject *\nPyUnicode_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors)\n{ PyObject *v; char buflower[11]; // unicode 参数要指向一个字符串 if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } // 如果不指定编码，那么使用 UTF-8 if (encoding == NULL) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果指定了编码，那么进行判断 if (_Py_normalize_encoding(encoding, buflower, sizeof(buflower))) { char *lower = buflower; /* Fast paths */ // 快分支，判断是否是 UTF-* 系列 if (lower[0] == 'u' && lower[1] == 't' && lower[2] == 'f') { lower += 3; if (*lower == '_') { /* Match \"utf8\" and \"utf_8\" */ lower++; } // 如果是 UTF-8 if (lower[0] == '8' && lower[1] == 0) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果是 UTF-16 else if (lower[0] == '1' && lower[1] == '6' && lower[2] == 0) { return _PyUnicode_EncodeUTF16(unicode, errors, 0); } // 如果是 UTF-32 else if (lower[0] == '3' && lower[1] == '2' && lower[2] == 0) { return _PyUnicode_EncodeUTF32(unicode, errors, 0); } } // 否则判断是否是 ascii、latin1、iso8859-1 等编码 else { if (strcmp(lower, \"ascii\") == 0 || strcmp(lower, \"us_ascii\") == 0) { return _PyUnicode_AsASCIIString(unicode, errors); }\n#ifdef MS_WINDOWS else if (strcmp(lower, \"mbcs\") == 0) { return PyUnicode_EncodeCodePage(CP_ACP, unicode, errors); }\n#endif else if (strcmp(lower, \"latin1\") == 0 || strcmp(lower, \"latin_1\") == 0 || strcmp(lower, \"iso_8859_1\") == 0 || strcmp(lower, \"iso8859_1\") == 0) { return _PyUnicode_AsLatin1String(unicode, errors); } } } // 如果以上编码都不是，那么执行通用逻辑 _PyCodec_EncodeText v = _PyCodec_EncodeText(unicode, encoding, errors); if (v == NULL) return NULL; /* The normal path */ if (PyBytes_Check(v)) return v; /* If the codec returns a buffer, raise a warning and convert to bytes */ if (PyByteArray_Check(v)) { int error; PyObject *b; error = PyErr_WarnFormat(PyExc_RuntimeWarning, 1, \"encoder %s returned bytearray instead of bytes; \" \"use codecs.encode() to encode to arbitrary types\", encoding); if (error) { Py_DECREF(v); return NULL; } b = PyBytes_FromStringAndSize(PyByteArray_AS_STRING(v), PyByteArray_GET_SIZE(v)); Py_DECREF(v); return b; } PyErr_Format(PyExc_TypeError, \"'%.400s' encoder returned '%.400s' instead of 'bytes'; \" \"use codecs.encode() to encode to arbitrary types\", encoding, Py_TYPE(v)->tp_name); Py_DECREF(v); return NULL;\n} 由于现在的主流编码是 utf-8，所以绝大部分情况都会执行 _PyUnicode_AsUTF8String 函数，我们看一下它的逻辑。 // Objects/unicodeobject.c\nPyObject *\n_PyUnicode_AsUTF8String(PyObject *unicode, const char *errors)\n{ return unicode_encode_utf8(unicode, _Py_ERROR_UNKNOWN, errors);\n} static PyObject *\nunicode_encode_utf8(PyObject *unicode, _Py_error_handler error_handler, const char *errors)\n{ enum PyUnicode_Kind kind; void *data; Py_ssize_t size; if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } if (PyUnicode_READY(unicode) == -1) return NULL; // 如果是 ASCII 字符串，那么直接获取每个字符的码点，创建 bytes 对象 if (PyUnicode_UTF8(unicode)) return PyBytes_FromStringAndSize(PyUnicode_UTF8(unicode), PyUnicode_UTF8_LENGTH(unicode)); // 获取字符串的 kind kind = PyUnicode_KIND(unicode); // 获取首字符的地址，首字符紧跟在结构体后面 data = PyUnicode_DATA(unicode); // 获取字符串的长度 size = PyUnicode_GET_LENGTH(unicode); // 判断 kind 种类 switch (kind) { default: Py_UNREACHABLE(); case PyUnicode_1BYTE_KIND: // 基于不同 kind 调用不同的函数 assert(!PyUnicode_IS_ASCII(unicode)); return ucs1lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_2BYTE_KIND: return ucs2lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_4BYTE_KIND: return ucs4lib_utf8_encoder(unicode, data, size, error_handler, errors); }\n} 整个过程还是我们之前说的，通过 utf-8 编码将每个字符转成对应的编号，组合起来得到的就是 bytes 对象。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 encode","id":"137","title":"字符串的 encode"},"138":{"body":"到目前为止，我们就说完了字符串相关的内容。必须要强调的是，字符串没有想象中的那么简单，而在 CPython 里面，字符串的源码将近两万行。 如果你还对字符串的其它操作感兴趣，想看看它的具体实现，可以自己深入源码探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 小结","id":"138","title":"小结"},"139":{"body":"本篇文章来分析一下列表，在初学列表的时候，可能书上会告诉你列表就是一个大仓库，什么都可以存放。但在最开始的几个章节中，我们花了很大的笔墨介绍了 Python 的对象，并明白了变量的本质。所以到现在列表已经没有什么好神秘的了，它里面存放的元素其实都是泛型指针 PyObject *。 并且根据我们使用列表的经验，可以得出以下两个结论： 每个列表的元素个数可以不一样，所以它是一个变长对象 可以对列表进行添加、删除、修改等操作，所以它是一个可变对象","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 楔子","id":"139","title":"楔子"},"14":{"body":"Python 一切皆对象，而所有的对象都拥有一些共同的信息（也叫头部信息），这些信息位于 PyObject 中，它是 Python 对象机制的核心，下面来看看它的定义。 // Include/object.h typedef struct _object { _PyObject_HEAD_EXTRA Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 首先解释一下结构体里面的 _PyObject_HEAD_EXTRA，这是一个宏，定义如下。 // Include/object.h // 如果定义了宏 Py_TRACE_REFS\n#ifdef Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 会展开成如下两个字段\n// 显然程序中创建的对象会组成一个双向链表\n#define _PyObject_HEAD_EXTRA \\ struct _object *_ob_next; \\ struct _object *_ob_prev;\n// 用于将 _ob_next 和 _ob_prev 初始化为空\n#define _PyObject_EXTRA_INIT 0, 0,\n// 否则说明没有定义宏 Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 和 _PyObject_EXTRA_INIT 不会有任何作用\n#else\n#define _PyObject_HEAD_EXTRA\n#define _PyObject_EXTRA_INIT\n#endif 所以如果定义了宏 Py_TRACE_REFS，那么展开之后 PyObject 就是下面这样。 typedef struct _object { PyObject *_ob_next; PyObject *_ob_prev; Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 但 Py_TRACE_REFS 一般只在编译调试的时候会开启，我们从官网下载的都是 Release 版本，不包含这个宏，因此这里我们也不考虑它。所以 PyObject 最终就等价于下面这个样子： typedef struct _object { Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 所以 PyObject 里面包含了两个字段，分别是 ob_refcnt 和 ob_type。 ob_refcnt 表示对象的引用计数，当对象被引用时，ob_refcnt 会自增 1；引用解除时，ob_refcnt 会自减 1。而当对象的引用计数为 0 时，则会被回收。 那么在哪些情况下，引用计数会加 1 呢？哪些情况下，引用计数会减 1 呢？ 引用计数加 1 的情况： 对象被创建：比如 name = \"古明地觉\"，此时对象就是 \"古明地觉\" 这个字符串，创建成功时它的引用计数为 1； 变量传递使得对象被新的变量引用：比如 name2 = name； 引用该对象的某个变量作为参数传递到一个函数或者类中：比如 func(name)； 引用该对象的某个变量作为元组、列表、集合等容器的元素：比如 lst = [name]； 引用计数减 1 的情况： 引用该对象的变量被显式地销毁：del name； 引用该对象的变量指向了别的对象：name = \"\"； 引用该对象的变量离开了它的作用域，比如函数的局部变量在函数执行完毕时会被删除； 引用该对象的变量所在的容器被销毁，或者变量从容器里面被删除； 因为变量只是一个和对象绑定的符号，更接地气一点的说法就是，变量是个便利贴，贴在指定的对象上面。所以 del 变量 并不是删除变量指向的对象，而是删除变量本身，可以理解为将对象身上的便利贴给撕掉了，其结果就是对象的引用计数减一。至于对象是否被删除（回收）则是解释器判断其引用计数是否为 0 决定的，为 0 就删，不为 0 就不删，就这么简单。 然后看一下字段 ob_refcnt 的类型，该类型为 Py_ssize_t，它是 ssize_t 的别名，在 64 位机器上等价于 int64。因此一个对象的引用计数不能超过 int64 所能表示的最大范围。但很明显，如果不费九牛二虎之力去写恶意代码，是不可能超过这个范围的。 说完了 ob_refcnt，再来看看 PyObject 的另一个字段 ob_type，相信你能猜到它的含义。对象是有类型的，类型对象描述实例对象的行为，而 ob_type 存储的便是对应的类型对象的指针，所以类型对象在底层是一个 struct _typeobject 结构体实例。另外 struct _typeobject 还有一个类型别名叫 PyTypeObject，关于类型对象，我们后续再聊。 以上就是 PyObject，它的定义非常简单，就一个引用计数和一个类型对象的指针。这两个字段的大小都是 8 字节，所以一个 PyObject 结构体实例的大小是 16 字节。由于 PyObject 是所有对象都具有的，换句话说就是所有对象对应的结构体都内嵌了 PyObject，因此你在 Python 里面看到的任何一个对象都有引用计数和类型这两个属性。 >>> num = 666 >>> sys.getrefcount(num)\n2\n>>> num.__class__\n<class 'int'> >>> sys.getrefcount(sys)\n56\n>>> sys.__class__\n<class 'module'> >>> sys.getrefcount(sys.path)\n2\n>>> sys.path.__class__\n<class 'list'> >>> def foo(): pass\n... >>> sys.getrefcount(foo)\n2\n>>> foo.__class__\n<class 'function'> 引用计数可以通过 sys.getrefcount 函数查看，类型可以通过 type(obj) 或者 obj.__class__ 查看。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 对象的地基：PyObject","id":"14","title":"对象的地基：PyObject"},"140":{"body":"列表在底层由 PyListObject 结构体表示，看一下它长什么样子。 // Include/listobject.h\ntypedef struct { PyObject_VAR_HEAD /* Vector of pointers to list elements. list[0] is ob_item[0], etc. */ PyObject **ob_item; /* ob_item contains space for 'allocated' elements. The number * currently in use is ob_size. * Invariants: * 0 <= ob_size <= allocated * len(list) == ob_size * ob_item == NULL implies ob_size == allocated == 0 * list.sort() temporarily sets allocated to -1 to detect mutations. * * Items must normally not be NULL, except during construction when * the list is not yet visible outside the function that builds it. */ Py_ssize_t allocated;\n} PyListObject; 我们看到里面有如下字段： PyObject_VAR_HEAD：变长对象的公共头部信息； ob_item：一个二级指针，指向 PyObject * 数组的首元素，这个指针数组保存的便是对象的指针，而操作数组都是通过 ob_item 来进行操作的； allocated：容量，我们知道列表底层使用了 C 的数组，而底层数组的长度就是列表的容量； 列表之所以要有容量的概念，是因为列表可以动态添加元素，但底层的数组在创建完毕之后，其长度却是固定的。所以当添加新元素时，发现数组已经满了，这个时候只能申请一个更长的数组，同时把原来数组中的元素依次拷贝到新数组里面（这一过程就是列表的扩容），然后再将新元素添加进去。 但是问题来了，总不可能每添加一个元素，就申请一次数组、将所有元素都拷贝一次吧。所以列表在扩容的时候，会将数组申请的长一些，从而在添加元素的时候不用每次都申请新的数组。 这便是列表的结构示意图，我们看到底层数组的长度为 4，说明此时列表的容量为 4。但是里面有 3 个 PyObject * 指针，说明列表的 ob_size 是 3，或者说列表里面有 3 个元素。 如果这个时候我们往列表中 append 一个元素，那么会将这个新元素设置在数组索引为 ob_size 的位置、或者说第四个位置。一旦设置完，ob_size 会自动加 1，因为 ob_size 要和列表的长度保持一致。 列表的容量是 4，但此时长度也达到了 4，所以列表的长度、或者说元素个数已经达到了容量。这说明当下一次 append 的时候，已经没有办法再容纳新的元素了。当然最直观的还是这里的底层数组，很明显全都占满了。那这个时候如果想再接收新的元素的话，要怎么办呢？显然只能扩容了。 原来的容量是 4，长度也是 4，当再来一个新元素的时候由于没有位置了，所以要扩容。但扩容的时候肯定会将容量申请的大一些、即底层数组申请的长一些，具体申请多长，Python 内部有一个公式，我们后面会说。总之申请的新的底层数组长度是 8，那么说明列表的容量就变成了 8。 新数组申请之后，将原来旧数组中的 PyObject * 按照顺序依次拷贝过去，再让 ob_item 指向新数组。然后把要添加的元素设置在新数组中索引为 ob_size 的位置、即第 5 个位置，并将 ob_size 加 1。最后将旧数组释放掉。 以上便是列表底层在扩容的时候所经历的过程。 由于扩容会申请新数组，然后将旧数组的元素拷贝到新数组中，所以这是一个时间复杂度为 O(n) 的操作。而 append 可能会导致列表扩容，因此 append 最坏情况下也是一个 O(n) 的操作，只不过扩容不会频繁发生，所以 append 方法的平均时间复杂度还是 O(1)。 另外我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了指向这个指针数组首元素的二级指针。显然我们添加、删除、修改元素等操作，都是通过 ob_item 二级指针来间接操作指针数组。 至于这么做的原因，我们在介绍 Python 对象的时候就说过了，不记得了的话，可以回去翻一翻。 所以底层对应的 PyListObject 实例的大小其实是不变的，因为指针数组没有存在 PyListObject 里面。但 Python 在计算内存大小的时候是会将这个指针数组也算进去的，所以列表的大小是可变的。 而且我们知道，列表在 append 之后地址是不变的，至于原因上面的几张图已经解释得很清楚了。 如果长度没有达到容量，那么 append 其实就是往底层数组中设置了一个新元素。如果达到容量了，那么会扩容，但扩容只是申请一个新的指针数组，然后让 ob_item 重新指向罢了。所以底层的指针数组会变，但是 PyListObject 结构体实例本身是没有变化的，因此列表在执行 append、extend、pop、insert 等操作时，地址不会发生变化。 下面再来看看列表所占的内存大小是怎么算的，首先 PyListObject 里面的 PyObject_VAR_HEAD 占 24 字节，ob_item 占 8 字节，allocated 占 8 字节，总共 40 字节。但是不要忘记，在计算列表大小的时候，ob_item 指向的指针数组也要算在内。所以：列表的大小 = 40 + 8 * 指针数组长度（或者说列表容量）。注意是指针数组长度，可不是列表长度，因为数组一旦申请了，不管你用没用，大小就摆在那里了。就好比你租了间房子，就算不住，房租该交还是得交。 # 显然一个空数组占 40 个字节\nprint([].__sizeof__()) # 40 # 40 + 3 * 8 = 64\nprint([1, 2, \"x\" * 1000].__sizeof__()) # 64\n# 虽然里面有一个长度为 1000 的字符串\n# 但我们说列表存放的都是指针，所以大小都是 8 字节 # 注意：我们通过 lst = [1, 2, 3] 这种方式创建列表的话\n# 不管内部元素有多少个, 其 ob_size 和 allocated 都是一样的\n# 只有当列表在添加元素的时候发现容量不够了才会扩容\nlst = list(range(10))\n# 40 + 10 * 8 = 120\nprint(lst.__sizeof__()) # 120 # 长度为 4，此时容量也是 4\nlst = [\"巭\", \"孬\", \"嫑\", \"睡觉\"]\n# 大小为 40 + 4 * 8 = 72\nprint(lst.__sizeof__()) # 72\n# 添加一个元素\nlst.append(\"觉得睡啊\")\n# 大小变成了 40 + 8 * 8 = 104\n# 说明当发生扩容时，底层数据可以容纳 8 个元素\nprint(lst.__sizeof__()) # 104 关于列表的长度和容量的关系，以及扩容的规则，我们后续再聊。总之目前我们知道列表的大小是怎么计算的，以及为什么列表在通过索引定位元素的时候，时间复杂度是 O(1)。因为列表存储的都是对象的指针，不管对象有多大，其指针大小是固定的，都是 8 字节，通过索引可以瞬间计算出偏移量。 print([1, 2, 3].__sizeof__()) # 64\nprint([[1, 2, 3]].__sizeof__()) # 48 相信上面这个结果，你肯定能分析出原因。因为第一个列表中有 3 个指针，所以大小是 40 + 24 = 64。而第二个列表中有一个指针，所以是 40 + 8 = 48。用一张图来展示一下 [1, 2, 3] 和 [[1, 2, 3]] 的底层结构，看看它们之间的区别： 到此相信你已经彻底掌握列表的结构了，那么下一篇文章我们来介绍一下列表的长度和容量之间的关系，以及扩容是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 列表的底层结构","id":"140","title":"列表的底层结构"},"141":{"body":"本篇文章来说一说列表的扩容，我们知道列表在添加元素时，如果发现底层的指针数组已经满了，那么会进行扩容，申请一个更大的数组。 下面就来看看底层是怎么实现的，相关操作都位于 Objects/listobject.c 中。 static int\nlist_resize(PyListObject *self, Py_ssize_t newsize)\n{ // 参数 self 就是列表，newsize 指的是元素在添加之后的 ob_size // 比如列表的 ob_size 和容量都是 4，append 的时候发现容量不够 // 所以会扩容，那么这里的 newsize 就是 5 // 如果是 extend 添加 3 个元素，那么这里的 newsize 就是 7 // 当然 list_resize 这个函数不仅可以扩容，也可以缩容 // 假设列表原来有 1000 个元素，这个时候将列表清空了，那么容量肯定缩小，不然会浪费内存 // 如果清空了列表，那么这里的 newsize 显然就是 0 // 二级指针，指向指针数组的首元素 PyObject **items; // 新的容量，以及新的指针数组的内存大小 size_t new_allocated, num_allocated_bytes; // 获取原来的容量 Py_ssize_t allocated = self->allocated; // 如果 newsize 达到了容量的一半，但还没有超过容量 // 那么意味着 newsize、或者新的 ob_size 和容量是匹配的 // 所以容量不会变化，直接将列表的 ob_size 设置为 newsize 即可 if (allocated >= newsize && newsize >= (allocated >> 1)) { assert(self->ob_item != NULL || newsize == 0); Py_SIZE(self) = newsize; return 0; } // 走到这里说明容量和 newsize 不匹配了，所以要进行扩容或者缩容 // 因此要申请新的底层数组，那么长度是多少呢？ // 这里给出了公式，一会儿我们可以通过 Python 进行测试 new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6); // 容量也是有范围的，乘上 8 字节不能超过 PY_SSIZE_T_MAX if (new_allocated > (size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)) { PyErr_NoMemory(); return -1; } // 如果 newsize 为 0，那么容量也为 0 if (newsize == 0) new_allocated = 0; // 分配内存 num_allocated_bytes = new_allocated * sizeof(PyObject *); items = (PyObject **)PyMem_Realloc(self->ob_item, num_allocated_bytes); if (items == NULL) { PyErr_NoMemory(); return -1; } // 将 ob_items 字段设置为 items self->ob_item = items; // 将 ob_size 字段设置为 newsize Py_SIZE(self) = newsize; // 将 allocated 字段设置为 new_allocated self->allocated = new_allocated; return 0;\n} 我们看到还是很简单的，没有什么黑科技。然后是列表扩容的时候，容量和元素个数之间的规律。其实在 list_resize 函数中是有注释的，其中有这么一行。 说明我们往一个空列表中不断 append 元素的时候，容量会按照上面的规律进行变化，我们来试一下。 lst = []\nallocated = 0\nprint(\"此时容量是: 0\") for item in range(100): lst.append(item) # 添加元素 # 计算 ob_size ob_size = len(lst) # 判断 ob_size 和当前的容量 if ob_size > allocated: # 列表的大小减去空列表的大小，再除以 8 显然就是容量 allocated = (lst.__sizeof__() - [].__sizeof__()) // 8 print(f\"列表扩容啦, 新的容量是: {allocated}\")\n\"\"\"\n此时容量是: 0\n列表扩容啦, 新的容量是: 4\n列表扩容啦, 新的容量是: 8\n列表扩容啦, 新的容量是: 16\n列表扩容啦, 新的容量是: 25\n列表扩容啦, 新的容量是: 35\n列表扩容啦, 新的容量是: 46\n列表扩容啦, 新的容量是: 58\n列表扩容啦, 新的容量是: 72\n列表扩容啦, 新的容量是: 88\n列表扩容啦, 新的容量是: 106\n\"\"\" 我们看到和官方给的结果是一样的，显然这是毫无疑问的，根据底层的公式也能算出来。 ob_size = 0\nallocated = 0 print(allocated, end=\" \")\nfor item in range(100): newsize = ob_size + 1 if newsize > allocated: allocated = (newsize + (newsize >> 3) + 6) & ~3 print(allocated, end=\" \") ob_size = newsize\n\"\"\"\n0 4 8 16 24 32 40 52 64 76 92 108 \"\"\" 注：扩容是在添加元素的时候发现容量不够发生的，也就是底层数组存储的实际元素的个数（列表长度）等于数组长度，没办法再容纳新的元素了，所以要扩容。 如果我们直接通过 lst = [] 这种形式创建列表的话，那么其长度和容量是一样的。 lst = [0] * 1000\n# 长度和容量一致\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 但再添加一个元素的话, 那么 ob_size 会变成 1001，大于容量 1000\n# 所以此时列表就要扩容了, 执行 list_resize，里面的 new_size 就是 1001\n# 然后是怎么分配容量来着，new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6)\nprint( \"新容量:\", 1001 + (1001 >> 3) + (3 if 1001 < 9 else 6)\n) # 新容量: 1132 # append 一个元素，列表扩容\nlst.append(123)\n# 计算容量\nprint((lst.__sizeof__() - [].__sizeof__()) // 8) # 1132 结果是一样的，因为底层就是这么实现的，所以结果必须一样。只不过我们通过这种测试的方式证明了这一点，也加深了对列表的认识。 需要注意的是，会影响列表元素个数的操作（append、extend、insert、pop 等等），在执行前都会先执行一下 list_resize 进行容量检测。如果计算之后的 newsize 和 allocated 之间的关系是匹配的，即 allocated//2 <= newsize <= allocated，那么只需要将 ob_size 的大小更新为 newsize 即可。如果不匹配，那么还要进行扩容，此时是一个 O(n) 的操作。 介绍完扩容，再来介绍缩容，因为列表元素个数要是减少到和容量不匹配的话，也要进行缩容。 举个生活中的例子，假设你租了 10 间屋子用于办公，显然你要付 10 间屋子的房租，不管你有没有用，一旦租了肯定是要付钱的。同理底层数组也是一样，只要你申请了，不管有没有元素，内存已经占用了。但有一天你用不到 10 间屋子了，假设要用 8 间或者 9 间，那么会让剩余的屋子闲下来。但由于退租比较麻烦，并且只闲下来一两间屋子，所以干脆就不退了，还是会付 10 间屋子的钱，这样没准哪天又要用的时候就不用重新租了。 对于列表也是如此，在删除元素（相当于屋子不用了）的时候，如果发现长度还没有低于容量的一半，那么也不会缩容。但反之就要缩容了，比如屋子闲了 8 间，也就是只需要两间屋子就足够了，那么此时肯定要退租了，闲了 8 间，可能会退掉 6 间。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 删除 500 个元素, 此时长度或者说 ob_size 就为 500\nlst[500:] = []\n# 但 ob_size 还是达到了容量的一半, 所以不会缩容\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 500 1000 # 如果再删除一个元素的话, 那么不好意思, 显然就要进行缩容了\n# 因为 ob_size 变成了 499, 小于 1000 // 2\n# 缩容之后容量怎么算呢? 还是之前那个公式\nprint(499 + (499 >> 3) + (3 if 499 < 9 else 6)) # 567 # 测试一下, 删除一个元素, 看看会不会按照我们期待的规则进行缩容\nlst.pop()\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 499 567 一切都和我们想的是一样的，另外在代码中我们还看到一个 if 语句，就是如果 newsize 是 0，那么容量也是 0，来测试一下。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 lst[:] = []\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 0 0 # 如果按照之前的容量变化公式的话, 会发现结果应该是 3\n# 但实际结果是 0, 就是因为多了 if 判断\n# 如果 newsize 是 0, 就把容量也设置为 0\nprint(0 + (0 >> 3) + (3 if 0 < 9 else 6)) # 3 为什么要这么做呢？因为 Python 认为，列表长度为 0 的话，说明你不想用这个列表了，所以多余的 3 个也没有必要申请了。 还以租房为栗，如果你一间屋子都不用了，说明你可能不用这里的屋子办公了，因此直接全部退掉。 以上就是列表在改变容量时所采用的策略，我们从头到尾全部分析了一遍。下一篇文章来看一下列表的创建，以及缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"34. 列表是怎么扩容的？","id":"141","title":"34. 列表是怎么扩容的？"},"142":{"body":"前面我们分析了列表的底层结构和扩容机制，本篇文章来聊一聊列表的创建和销毁，以及缓存池。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 楔子","id":"142","title":"楔子"},"143":{"body":"创建列表，解释器只提供了唯一的一个 Python/C API，也就是 PyList_New。这个函数接收一个 size 参数，允许我们在创建 PyListObject 对象时指定底层的 PyObject * 数组的长度。 //Objects/listobject.c\nPyObject *\nPyList_New(Py_ssize_t size)\n{ // 声明一个 PyListObject * 变量 // 指向即将创建的 PyListObject 对象 PyListObject *op; // 底层数组的长度必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // numfree 表示缓存池中已缓存的元素个数 // 如果大于 0，证明有可用元素，那么会从缓存池中获取 if (numfree) { // 可用元素的数量减一 numfree--; // 获取缓存的列表指针，并将指向的列表的引用计数设置为 1 op = free_list[numfree]; _Py_NewReference((PyObject *)op); } else { // 如果缓存池中没有可用元素，那么通过 PyObject_GC_New 申请内存 // 问题来了，之前申请内存不是用的 PyObject_New 吗 // 这里为啥换成 PyObject_GC_New 呢？我们稍后再说 op = PyObject_GC_New(PyListObject, &PyList_Type); if (op == NULL) return NULL; } // 如果 size <= 0，那么一定等于 0，此时列表不包含任何元素 if (size <= 0) // 那么 ob_item 直接设置为 NULL op->ob_item = NULL; else { // 否则为底层数组申请内存，因为存储的都是指针 // 所以大小为 size * sizeof(PyObject *) op->ob_item = (PyObject **) PyMem_Calloc(size, sizeof(PyObject *)); if (op->ob_item == NULL) { Py_DECREF(op); return PyErr_NoMemory(); } } // 将 ob_size 和 allocated 均设置为 size Py_SIZE(op) = size; op->allocated = size; // 让列表被 GC 跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 整个过程非常好理解，就是先创建一个 PyListObject 对象，然后再为底层数组申请内存，最后通过 ob_item 字段将两者关联起来。当然这个过程中会使用缓存池，关于缓存池一会儿再聊。 然后还要说一下内存申请函数，在这之前我们看到申请内存用的是 PyObject_New 函数，它和这里的 PyObject_GC_New 有什么区别呢？由于涉及到 Python 的内存管理，我们暂时先不聊那么深，大家先有个基本了解即可，等到介绍内存管理和垃圾回收的时候会详细剖析。 我们知道 Python 对象在底层都是一个结构体，并且结构体内部嵌套了 PyObject。但对于那些能够产生循环引用的可变对象来说，它们除了 PyObject 之外，还包含了一个 PyGC_Head，用于垃圾回收。 所以 PyObject_New 和 PyObject_GC_New 接收的参数是一样的，但后者会多申请 16 字节的内存，这 16 字节是为 PyGC_Head 准备的。那么问题来了，PyGC_Head 在什么地方呢？ PyGC_Head 就在 PyObject 的前面，但是注意：虽然为 PyGC_Head 申请了内存，但返回的是 PyObject 的地址。至于这里面的更多细节，后续在剖析内存管理和垃圾回收的时候细说，目前先简单了解一下即可。 然后再说一下计算内存的两种方式： import sys lst = []\n# 可以调用 __sizeof__ 方法计算对象的内存\nprint(lst.__sizeof__()) # 40\n# 也可以通过 sys.getsizeof 函数\nprint(sys.getsizeof(lst)) # 56 我们看到 sys.getsizeof 算出的结果会多出 16 字节，相信你能猜到原因，因为它将 PyGC_Head 也算进去了，而对象的 __sizeof__ 方法则不会算在内。 不过对于字符串、整数、浮点数这种不会产生循环引用的对象来说，由于没有 PyGC_Head，所以两种方式计算的结果是一样的。 import sys print(\"\".__sizeof__()) # 49\nprint(sys.getsizeof(\"\")) # 49 print((123).__sizeof__()) # 28\nprint(sys.getsizeof(123)) # 28 以上就是列表的创建，整个过程不难理解。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的创建","id":"143","title":"列表的创建"},"144":{"body":"创建 PyListObject 对象时，会先检测缓存池 free_list 里面是否有可用的对象，有的话直接拿来用，否则通过 malloc 在系统堆上申请。列表的缓存池是使用数组实现的，里面最多维护 80 个 PyListObject 对象。 // Objects/listobject.c\n#ifndef PyList_MAXFREELIST\n#define PyList_MAXFREELIST 80\n#endif\n// free_list 是一个 PyListObject * 数组，容量为 80\n// 添加元素时会从数组的尾部添加，获取元素时也会从数组的尾部获取\nstatic PyListObject *free_list[PyList_MAXFREELIST];\n// 缓存池中可用元素数量\nstatic int numfree = 0; 根据之前的经验我们知道，既然创建的时候能从缓存池中获取，那么在执行析构函数的时候也要把列表放到缓存池里面。看一下列表的析构函数，它由 PyList_Type 的 tp_dealloc 字段负责，而该字段被设置为 list_dealloc。 // Objects/listobject.c\nstatic void\nlist_dealloc(PyListObject *op)\n{ Py_ssize_t i; // 列表可能会产生循环引用，因此创建之后要被 GC 跟踪 // 而现在要被回收了，所以也要取消 GC 跟踪 PyObject_GC_UnTrack(op); // 这一步的作用，稍后再说 Py_TRASHCAN_BEGIN(op, list_dealloc) // 先释放底层数组 if (op->ob_item != NULL) { // 但是释放之前，还有一件重要的事情 // 要将底层数组中每个指针指向的对象的引用计数都减去 1 // 因为它们不再持有对\"对象\"的引用 i = Py_SIZE(op); while (--i >= 0) { Py_XDECREF(op->ob_item[i]); } // 然后释放底层数组所占的内存 PyMem_FREE(op->ob_item); } // 如果已缓存的元素个数小于 80 个，并且 op 指向的是列表 // 那么将 op 追加到数组中，并将 numfree 自增 1 if (numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) free_list[numfree++] = op; else // 否则将列表的内存释放掉 Py_TYPE(op)->tp_free((PyObject *)op); Py_TRASHCAN_END\n} 我们知道创建一个 PyListObject 对象会分为两步，先创建 PyListObject 对象，然后创建底层数组，最后让 PyListObject 对象的 ob_item 字段指向底层数组的首元素。同理，在销毁一个 PyListObject 对象时，会先释放 ob_item 维护的底层数组，然后在缓存池已满的情况下再释放 PyListObject 对象自身。 现在我们算是明白了缓存池的机制，本来在销毁列表时，要将它的内存释放。但因为缓存池机制，解释器并没有这么做，而是将它的指针放在了缓存池里，至于列表对象则依旧驻留在堆上，只是我们已经无法再访问了。 当以后创建新的 PyListObject 对象时，解释器会首先唤醒这些已经死去的 PyListObject 对象，给它们一个洗心革面、重新做人的机会。但需要注意的是，这里缓存的仅仅是 PyListObject 对象，至于底层数组，其 ob_item 已经不再指向了。 从 list_dealloc 中我们可以看到，PyListObject 对象的指针在放进缓存池之前，ob_item 指向的数组就已经被释放掉了，同时数组中指针指向的对象的引用计数会减 1。所以最终数组中这些指针指向的对象也大难临头各自飞了，或生存、或毁灭，总之此时和 PyListObject 之间已经没有任何联系了。 但是为什么要这么做呢？为什么不连底层数组也一起维护呢？可以想一下，如果继续维护的话，数组中指针指向的对象永远不会被释放，那么很可能会产生悬空指针的问题。 但实际上是可以将底层数组进行保留的，做法是只将数组中指针指向的对象的引用计数减 1，然后将数组中的指针都设置为 NULL，不再指向之前的对象，但并不释放底层数组本身所占用的内存空间。这样一来释放的内存不会交给系统堆，那么再次分配的时候，速度会快很多。但这样会带来两个问题。 1）这些内存没人用也会一直占着，并且只能供 PyListObject 对象的 ob_item 指向的底层数组使用。 2）基于缓存池获取的列表的容量，和新创建的列表的容量不一定匹配。比如底层数组长度为 6 的 PyListObject * 被放入了缓存池，那么表示列表最多容纳 6 个元素，但如果我们要创建一个长度为 8 的列表怎么办？此时依旧要重新为底层数组申请内存。 因此基于以上两个原因，Python 选择将底层数组所占的内存交还给了系统堆，当然也节省了内存。 lst1 = [1, 2, 3]\nprint(id(lst1)) # 139672412671360\n# 扔到缓存池中，放在数组的尾部\ndel lst1 # 从缓存池中获取，也会从数组的尾部开始拿\nlst2 = [1, 2, 3]\nprint(id(lst2)) # 139672412671360 # 因此打印的地址是一样的 以上就是列表的创建和销毁，以及它的缓存池原理。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的销毁","id":"144","title":"列表的销毁"},"145":{"body":"在看列表的销毁过程时，我们注意到里面有这么一行代码。 Py_TRASHCAN_BEGIN(op, list_dealloc) 这是做什么的呢，首先在 Python 中，我们可以创建具有深度递归的对象，比如： L = None for i in range(2 ** 20): L = [L] del L 此时的 L 就是一个嵌套了 2 ** 20 层的列表，当我们删除 L 的时候，会先销毁 L[0]、然后销毁 L[0][0]，以此类推，直到递归深度为 2 ** 20。而这样的深度毫无疑问会溢出 C 的调用栈，导致解释器崩溃。但事实上我们在 del L 的时候解释器并没有崩溃，原因就是 CPython 发明了一种名为 trashcan 的机制，它通过延迟销毁的方式来限制销毁的递归深度。关于这一特性，我们知道就好了，不用太关注。 下一篇文章来聊一聊列表的操作在底层是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » trashcan 机制","id":"145","title":"trashcan 机制"},"146":{"body":"列表拥有非常多的方法，比如添加元素、查询元素等，这些都属于列表的自定义方法。当然不光是列表，任何对象都可以有自己的自定义方法，而这些方法会保存在类型对象的 tp_methods 里面。 当然列表除了拥有自定义的方法之外，还拥有作为序列型对象所共有的方法，比如合并、基于索引和切片获取元素、基于索引和切片设置元素等等。这些方法会基于种类被抽象成三个方法簇，分别是： tp_as_number：数值型对象拥有的方法； tp_as_sequence：序列型对象拥有的方法； tp_as_mapping：映射型对象拥有的方法； 每个方法簇都包含了大量的 C 函数，每个 C 函数一般会对应 Python 里的一个魔法方法和操作符。比如 tp_as_sequence 的 sq_concat 对应序列型对象的 __add__ 方法，tp_as_number 的 nb_subtract 对应数值型对象的 __sub__ 方法。 那么接下来我们就详细剖析一下这些方法的具体实现过程。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 楔子","id":"146","title":"楔子"},"147":{"body":"序列型对象都实现了加法运算，比如列表，两个列表相加可以合并为一个新的列表。 print([1, 2, 3] + [4, 5]) \"\"\"\n[1, 2, 3, 4, 5]\n\"\"\" 虽然使用了 + 操作符，但它在底层是由 tp_as_sequence 的 sq_concat 负责实现的，该字段被赋值为 list_concat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_concat(PyListObject *a, PyObject *bb)\n{ // 两个列表相加之后的新列表的长度 Py_ssize_t size; Py_ssize_t i; PyObject **src, **dest; PyListObject *np; // 如果 bb 不是列表，抛出 TypeError if (!PyList_Check(bb)) { PyErr_Format(PyExc_TypeError, \"can only concatenate list (not \\\"%.200s\\\") to list\", bb->ob_type->tp_name); return NULL; }\n#define b ((PyListObject *)bb) // 两个列表的长度相加一定小于 PY_SSIZE_T_MAX if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) return PyErr_NoMemory(); // 新列表的长度，等于相加的两个列表的长度之和 size = Py_SIZE(a) + Py_SIZE(b); // 为 PyListObject 和底层数组申请空间（空间大小为 8 * size） np = (PyListObject *) list_new_prealloc(size); if (np == NULL) { return NULL; } // 将第一个列表的元素增加引用计数之后，拷贝到新列表中 src = a->ob_item; dest = np->ob_item; for (i = 0; i < Py_SIZE(a); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将第二个列表的元素增加引用计数之后，拷贝到新列表中 src = b->ob_item; dest = np->ob_item + Py_SIZE(a); for (i = 0; i < Py_SIZE(b); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; // 转成泛型指针之后返回 return (PyObject *)np;\n#undef b\n} 逻辑非常简单，假设两个列表 a 和 b 相加，过程如下。 先申请一个新列表，长度为 len(a) + len(b)； 将列表 a 的元素拷贝到新列表中； 将列表 b 的元素拷贝到新列表中； 说白了就是两个 for 循环。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的相加","id":"147","title":"列表的相加"},"148":{"body":"列表可以乘上一个整数，将自身重复指定次数，该过程会返回一个新列表。 print([1, 2, 3] * 3)\n\"\"\"\n[1, 2, 3, 1, 2, 3, 1, 2, 3]\n\"\"\" 虽然使用了 * 操作符，但它在底层是由 tp_as_sequence 的 sq_repeat 负责实现的，该字段被赋值为 list_repeat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_repeat(PyListObject *a, Py_ssize_t n)\n{ Py_ssize_t i, j; Py_ssize_t size; PyListObject *np; PyObject **p, **items; PyObject *elem; // 如果 n 小于 0，那么将 n 设置为 0 if (n < 0) n = 0; // 长度有限制，不能超过 PY_SSIZE_T_MAX if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) return PyErr_NoMemory(); // 新列表的长度 size = Py_SIZE(a) * n; // 如果列表长度为 0，那么直接返回空列表即可 if (size == 0) return PyList_New(0); // 为新列表和底层数组申请空间，底层数组的长度为 size np = (PyListObject *) list_new_prealloc(size); if (np == NULL) return NULL; // 如果原始列表的长度为 1，比如 a = [1]，n = 3 // 那么新列表就是 [1, 1, 1] if (Py_SIZE(a) == 1) { // 指向新列表的底层数组的首元素 items = np->ob_item; // 拿到原始列表的第一个元素 elem = a->ob_item[0]; // 将新列表的底层数组的元素全部设置为 elem for (i = 0; i < n; i++) { items[i] = elem; Py_INCREF(elem); } } // 如果原始列表的长度不为 1 else { // 指向新列表的底层数组的首元素 p = np->ob_item; // 指向原始列表的底层数组的首元素 items = a->ob_item; // 两层 for 循环 // 内层循环遍历原始数组，将元素拷贝到新数组，外层循环则是循环 n 次 for (i = 0; i < n; i++) { for (j = 0; j < Py_SIZE(a); j++) { *p = items[j]; Py_INCREF(*p); p++; } } } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; return (PyObject *) np;\n} 整个过程非常朴实无华。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的重复","id":"148","title":"列表的重复"},"149":{"body":"列表可以基于索引和切片截取元素。 data = [1, 2, 3, 4, 5]\nprint(data[1]) # 2\nprint(data[1: 4]) # [2, 3, 4] 在底层它由 tp_as_mapping 的 mp_subscript 实现，该字段被赋值为 list_subscript 函数，看一下它的内部逻辑。 // Objects/listobject.c static PyObject *\nlist_subscript(PyListObject* self, PyObject* item)\n{ // 在基于索引和切片截取时，所有序列型对象的逻辑都差不多 if (PyIndex_Check(item)) { Py_ssize_t i; // 如果 item 是索引，那么转成 Py_ssize_t 整数 i = PyNumber_AsSsize_t(item, PyExc_IndexError); if (i == -1 && PyErr_Occurred()) return NULL; // 如果 i 小于 0，那么加上列表长度，转成正数索引 if (i < 0) i += PyList_GET_SIZE(self); // 调用 list_item 获取 ob_item 中索引为 i 的元素 return list_item(self, i); } // 如果 item 是切片 else if (PySlice_Check(item)) { // start, stop, step 分别表示起始位置、终止位置、步长 // slicelength 表示切片截取的长度，也就是要截取多少个元素 Py_ssize_t start, stop, step, slicelength, cur, i; PyObject* result; PyObject* it; PyObject **src, **dest; // 获取切片的 start、stop、step if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 传入原始列表的长度，对 start 和 stop 进行调整，并返回 slicelength slicelength = PySlice_AdjustIndices(Py_SIZE(self), &start, &stop, step); // 如果 slicelength <= 0，说明截取不到任何元素 // 比如 data[5: 1] 或者 data[1: 5: -1]，那么直接返回空列表 if (slicelength <= 0) { return PyList_New(0); } // 如果步长为 1，那么直接将列表中 start 到 stop 之间的元素拷过去即可 else if (step == 1) { return list_slice(self, start, stop); } // 否则说明步长不为 1 else { // 为创建的新列表和底层数组申请空间 result = list_new_prealloc(slicelength); if (!result) return NULL; src = self->ob_item; // 从 start 处开始遍历，将元素拷贝过去 // 然后 cur 每次增加 step，遍历次数为 slicelength dest = ((PyListObject *)result)->ob_item; for (cur = start, i = 0; i < slicelength; cur += (size_t)step, i++) { it = src[cur]; Py_INCREF(it); dest[i] = it; } // 将新列表的 ob_size 设置为 slicelength Py_SIZE(result) = slicelength; return result; } } // 否则说明 item 既不是索引也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"list indices must be integers or slices, not %.200s\", item->ob_type->tp_name); return NULL; }\n} 这个和之前介绍的 bytes 对象有点像，因为它们都是序列型对象，在基于索引和切片截取元素时的逻辑也是类似的。但 bytes 对象只能截取元素，却不能设置元素，而列表是可以的，因为列表是可变对象。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片获取元素","id":"149","title":"基于索引和切片获取元素"},"15":{"body":"PyObject 是所有对象的核心，它包含了所有对象都共有的信息，但是还有那么一个属性虽然不是每个对象都有，但至少有一大半的对象会有，能猜到是什么吗？ 之前说过，对象根据所占的内存是否固定，可以分为定长对象和变长对象，而变长对象显然有一个长度的概念，比如字符串、列表、元组等等。即便是相同类型的实例对象，但是长度不同，所占的内存也是不同的。比如字符串内部有多少个字符，元组、列表内部有多少个元素，显然这里的多少也是 Python 中很多对象的共有特征。虽然不像引用计数和类型那样是每个对象都必有的，但也是绝大部分对象所具有的。 所以针对变长对象，Python 底层也提供了一个结构体，因为 Python 里面很多都是变长对象。 // Include/object.h typedef struct { PyObject ob_base; Py_ssize_t ob_size;\n} PyVarObject; 我们看到 PyVarObject 实际上是 PyObject 的一个扩展，它在 PyObject 的基础上添加了一个 ob_size 字段，用于记录内部的元素个数。比如列表，列表的 ob_size 维护的就是列表的元素个数，插入一个元素，ob_size 会加 1，删除一个元素，ob_size 会减 1。 因此使用 len 函数获取列表的元素个数是一个时间复杂度为 O(1) 的操作，因为 ob_size 始终和内部的元素个数保持一致，所以会直接返回 ob_size。 所有的变长对象都拥有 PyVarObject，而所有的对象都拥有 PyObject，这就使得在 Python 中，对对象的引用变得非常统一。我们只需要一个 PyObject * 就可以引用任意一个对象，而不需要管这个对象实际是一个什么样的对象。 所以 Python 变量、以及容器内部的元素，本质上都是一个 PyObject *。而在操作变量的时候，也要先根据 ob_type 字段判断指向的对象的类型，然后再寻找该对象具有的方法，这也是 Python 效率慢的原因之一。 由于 PyObject 和 PyVarObject 要经常使用，所以底层提供了两个宏，方便定义。 // Include/object.h #define PyObject_HEAD PyObject ob_base;\n#define PyObject_VAR_HEAD PyVarObject ob_base; 比如定长对象浮点数，在底层对应的结构体为 PyFloatObject，它只需在 PyObject 的基础上再加一个 double 即可。 typedef struct { // 等价于 PyObject ob_base; PyObject_HEAD double ob_fval;\n} PyFloatObject; 再比如变长对象列表，在底层对应的结构体是 PyListObject，所以它需要在 PyVarObject 的基础上再加一个指向指针数组首元素的二级指针和一个容量。 typedef struct { // 等价于 PyVarObject ob_base; PyObject_VAR_HEAD PyObject **ob_item; Py_ssize_t allocated;\n} PyListObject; 这上面的每一个字段都代表什么，我们之前提到过，当然这些内置的数据结构后续还会单独剖析。 对于 PyListObject，里面的 ob_item 就是指向指针数组首元素的二级指针，而 allocated 表示已经分配的容量，一旦添加元素的时候发现 ob_size 自增 1 之后会大于 allocated，那么解释器就知道数组已经满了（容量不够了）。于是会申请一个长度更大的指针数组，然后将旧数组内部的元素按照顺序逐个拷贝到新数组里面，并让 ob_item 指向新数组的首元素，这个过程就是列表的扩容，后续在剖析列表的时候还会细说。 所以我们看到列表在添加元素的时候，地址是不会改变的，即使容量不够了也没关系，直接让 ob_item 指向新的数组就好了，至于 PyListObject 对象（列表）本身的地址是不会变化的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 可变对象的地基：PyVarObject","id":"15","title":"可变对象的地基：PyVarObject"},"150":{"body":"列表是可变对象，因为它支持设置元素，即对内部元素进行修改。基于索引设置元素就不说了，我们主要看切片，它背后还是有一些复杂的。 data = [1, 2, 3, 4, 5, 6, 7, 8] # 通过切片设置元素，右值一定是一个可迭代对象\ndata[0: 3] = [11, 22, 33]\n# 会将 data[0] 设置为 11，将 data[1] 设置为 22，将 data[2] 设置为 33\nprint(data)\n\"\"\"\n[11, 22, 33, 4, 5, 6, 7, 8]\n\"\"\" # 而且它们的长度是可以不相等的，这里表示将 [0: 3] 的元素设置为 [1, 2]\n# 即 data[0] 设置成 1，data[1] 设置成 2，那么问题来了，data[2] 咋办？\n# 由于右值中已经没有元素与之匹配了，那么 data[2] 就会被删掉\ndata[0: 3] = [1, 2]\nprint(data)\n\"\"\"\n[1, 2, 4, 5, 6, 7, 8]\n\"\"\" # 所以如果想删除 [0: 3] 的元素，那么只需要执行 data[0: 3] = [] 即可\n# 因为 [] 里面没有元素能与之匹配，所以 data 中 [0: 3] 的位置由于匹配不到\n# 那么相当于执行了删除操作，当然由于 Python 的动态特性，还可以像下面这么做\n# data[0: 3] = []、data[0: 3] = ()、data[0: 3] = \"\" 等等也是没问题的\ndata[0: 3] = \"\"\nprint(data)\n\"\"\"\n[5, 6, 7, 8]\n\"\"\"\n# 实际上执行 del data[0] 的时候，就是执行了 data[0: 1] = []\n# 当然，如果右值元素多的话也是可以的，相当于插入\n# 比如这里的 data[0] 匹配 1，然后左边就结束了\n# 于是右侧剩余的元素会依次插在后面\ndata[0: 1] = [1, 2, 3, 4]\nprint(data)\n\"\"\"\n[1, 2, 3, 4, 6, 7, 8]\n\"\"\"\n# 重点来了，如果切片的步长不等于 1 的话，那么两边一定要匹配\n# 由于 data[:: 2] 会得到 4 个元素，那么右边的可迭代对象的长度就必须也是 4\ndata[:: 2] = ['a', 'b', 'c', 'd']\nprint(data)\n\"\"\"\n['a', 2, 'b', 4, 'c', 7, 'd']\n\"\"\" # 但如果长度不一致，那么会报错\ntry: data[:: 2] = ['a', 'b', 'c']\nexcept Exception as e: # 显然会报错 print(e) \"\"\"\nattempt to assign sequence of size 3 to extended slice of size 4\n\"\"\" 至于它的源码有兴趣可以自己看一下，在底层它由 tp_as_mapping 的 mp_ass_subscript 负责实现，该字段被赋值为 list_ass_subscript 函数。逻辑比较长，但不难理解，我们总结一下。 list_subscript 用于获取元素，list_ass_subscript 用于设置元素。调用这两个函数，我们即可以传入索引，也可以传入切片。 获取元素时传入的是索引，那么 list_subscript 内部会调用 list_item，传入的是切片，那么会调用 list_slice。 设置元素时传入的是索引，那么 list_ass_subscript 内部会调用 list_ass_item，传入的是切片，那么会调用 list_ass_slice。并且 list_ass_slice 虽然是设置元素，但删除元素也是调用的它，比如通过 data[n: n+1]=[] 便可删除索引为 n 的元素。事实上 remove 和 pop 方法都只是计算出待删除元素的索引，真正的删除操作还是通过 list_ass_slice 来执行的。 另外，当传入切片时，只有步长为 1，才会调用 list_slice 和 list_ass_slice。如果步长不为 1，那么就采用循环的方式逐个遍历。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片设置元素","id":"150","title":"基于索引和切片设置元素"},"151":{"body":"以上我们就介绍了列表作为序列型对象拥有的方法，但除了这些它还有很多自定义的方法。由于列表用得非常广泛，关于它的方法我们都来详细地说上一说，下一篇文章介绍列表的自定义方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 小结","id":"151","title":"小结"},"152":{"body":"上一篇文章我们介绍了列表作为序列型对象支持的方法，但列表还有很多的自定义方法。作为一名优秀的 Python 工程师，我们必须要知道这些方法的实现过程，以及相应的时间复杂度。 实例对象能够调用的方法都定义在类型对象中，类型对象无一例外都是 PyTypeObject 结构体实例，该结构体有一个 tp_methods 字段，负责维护实例对象能够调用的方法。由于 tp_methods 指向 PyMethodDef 结构体类型的数组，所以一个 PyMethodDef 结构体实例，就是 Python 实例对象能够调用的一个方法。 // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 承载了具体逻辑的 C 函数 PyCFunction ml_meth; // 指示函数的调用方式和传递参数的方式，比如 /* METH_NOARGS: 表示函数不接收任何参数 * METH_O: 函数只接收一个参数 * METH_VARARGS: 函数支持以元组的形式接收多个位置参数 * METH_KEYWORDS: 函数支持关键字参数 * METH_CLASS: 函数是一个类方法，等价于 Python 里的 @classmethod * METH_STATIC: 函数是一个静态方法，即 @staticmethod * METH_FASTCALL: 函数使用优化的快速调用协议，Python 3.7 及以上版本可用 传递参数时使用 C 数组，而不是 Python 元组 * METH_COEXIST: 如果希望存在两个同名函数，但类和实例分别调用不同的函数 那么便可以指定 METH_COEXIST */ int ml_flags; // 函数的 docstring const char *ml_doc; }; 而 list 在底层对应 PyList_Type，它的 tp_methods 字段被赋值为 list_methods。 里面定义了列表可以调用的方法，相信当你以后想查看某个对象的方法的底层实现时，已经知道该怎么定位了，下面我们就来看看这些方法的实现过程。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 楔子","id":"152","title":"楔子"},"153":{"body":"append 方法可以往列表尾部追加元素。 // Objects/clinic/listobject.c.h\n#define LIST_APPEND_METHODDEF \\ {\"append\", (PyCFunction)list_append, METH_O, list_append__doc__}, 它由 list_append 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_append(PyListObject *self, PyObject *object)\n{ // 调用 app1 添加元素，并返回 None if (app1(self, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\napp1(PyListObject *self, PyObject *v)\n{ // 获取当前列表的长度 Py_ssize_t n = PyList_GET_SIZE(self); assert (v != NULL); if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 追加元素之后 ob_size 会变成 n + 1 // 调用 list_resize 函数，判断 n + 1 和容量之间的关系 // 只要涉及到列表元素个数的改变，都要调用 list_resize 函数 if (list_resize(self, n+1) < 0) return -1; // 增加引用计数 Py_INCREF(v); // 将元素设置在索引为 n 的位置 PyList_SET_ITEM(self, n, v); return 0;\n} 所谓往尾部追加元素，本质上就是将元素设置在索引为 len 的位置。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » append：在尾部追加元素","id":"153","title":"append：在尾部追加元素"},"154":{"body":"接下来是列表的 insert 方法。 // Objects/clinic/listobject.c.h\n#define LIST_INSERT_METHODDEF \\ {\"insert\", (PyCFunction)(void(*)(void))list_insert, METH_FASTCALL, list_insert__doc__}, 它由 list_insert 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_insert(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 函数的返回值，但只会返回 None PyObject *return_value = NULL; // 插入的位置 Py_ssize_t index; // 插入的元素 PyObject *object; // insert 方法精确接收两个参数 if (!_PyArg_CheckPositional(\"insert\", nargs, 2, 2)) { goto exit; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 参数 args 是一个元组，里面包含了插入位置和元素 Py_ssize_t ival = -1; // 插入位置，对象必须实现 __index__ PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { // 转成 Py_ssize_t ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } // 赋值给 index index = ival; } // 拿到待插入的元素 object = args[1]; // 调用 list_insert_impl 执行元素插入逻辑 return_value = list_insert_impl(self, index, object); exit: // 虽然这里返回了 return_value，但我们知道 insert 方法是没有返回值的 // 或者说返回值为 None，所以上面的 list_insert_impl 一定返回了 None return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_insert_impl(PyListObject *self, Py_ssize_t index, PyObject *object)\n{ // 调用 ins1 插入元素，插入成功之后返回 None if (ins1(self, index, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\nins1(PyListObject *self, Py_ssize_t where, PyObject *v)\n{ // 初始化循环变量 i，n 为列表长度 Py_ssize_t i, n = Py_SIZE(self); // 指向 ob_item 数组的首元素 PyObject **items; if (v == NULL) { PyErr_BadInternalCall(); return -1; } if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 只要涉及到元素个数的改变，比如添加和删除元素 // 都会先调用 list_resize，在里面检测一下容量 // 比如这里，如果发现 (容量 >= n + 1) && (容量 / 2 <= n + 1) // 那么说明容量目前是合理的，不需要做任何的扩容或缩容操作（如果条件不满足则需要） // 然后将列表的 ob_size 修改为 n + 1，直接返回 if (list_resize(self, n+1) < 0) return -1; // 判断插入位置，如果 where 小于 0，那么加上列表长度 if (where < 0) { where += n; // 加上列表长度之后如果还小于 0，那么让其等于 0 if (where < 0) where = 0; } // 如果插入位置大于列表长度 n，那么让其等于 n，此时相当于 append if (where > n) where = n; items = self->ob_item; // 将 where 以及之后的元素依次向右移动一个位置 for (i = n; --i >= where; ) items[i+1] = items[i]; // 将待插入元素 v 的引用计数加 1，并设置在底层数组中索引为 where 的位置 Py_INCREF(v); items[where] = v; return 0;\n} 以上就是 insert 函数的底层逻辑，列表在插入数据的时候是非常灵活的，不管你在什么位置插入，都是合法的。它会自己调整，在确定待插入位置 where 之后，会将 where 以及之后的所有元素都向后挪动一个位置，空出来的地方设置为待插入的值。 另外我们看到 append 和 insert 其实非常像，都是基于索引设置元素。只不过对于 append 来说，索引就是列表长度，而对于 insert 来说，索引是由外界指定的，但函数内部会进行边界调整。 并且由于 insert 会涉及元素的移动，所以它的时间复杂度是 O(n)，而 append 则不会，它的时间复杂度是 O(1)。当然在极端情况下（发生扩容），append 也会退化成 O(n)，只不过这个过程不会频繁发生，所以 append 的复杂度仍然是 O(1) 的。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » insert：在任意位置插入元素","id":"154","title":"insert：在任意位置插入元素"},"155":{"body":"pop 默认会从尾部弹出一个元素，当然我们也可以指定索引，弹出指定索引对应的元素。如果不指定索引，那么默认是 -1。 // Objects/clinic/listobject.c.h\n#define LIST_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))list_pop, METH_FASTCALL, list_pop__doc__}, 它由 list_pop 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_pop(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 返回值 PyObject *return_value = NULL; Py_ssize_t index = -1; // pop 接收 0 ~ 1 个参数 if (!_PyArg_CheckPositional(\"pop\", nargs, 0, 1)) { goto exit; } // 如果参数个数小于 1，说白了就是没有传参，直接跳转到 skip_optional 标签 if (nargs < 1) { goto skip_optional; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 如果传参了，那么拿到指定的索引 Py_ssize_t ival = -1; PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } index = ival; }\nskip_optional: // 将列表和 index 作为参数传进去，如果不指定索引，那么 index 默认为 -1 return_value = list_pop_impl(self, index); exit: // 返回弹出的元素 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_pop_impl(PyListObject *self, Py_ssize_t index)\n{ PyObject *v; int status; // 如果列表为空，那么抛出 IndexError: pop from empty list if (Py_SIZE(self) == 0) { PyErr_SetString(PyExc_IndexError, \"pop from empty list\"); return NULL; } // 如果 index 小于 0，那么加上列表长度 if (index < 0) index += Py_SIZE(self); // 检测索引是否合法，如果索引小于 0 或大于等于列表长度 // 那么抛出 IndexError: pop index out of range if (!valid_index(index, Py_SIZE(self))) { PyErr_SetString(PyExc_IndexError, \"pop index out of range\"); return NULL; } // 拿到索引为 index 的元素，这也是一会儿要返回的元素 v = self->ob_item[index]; // 快分支，如果 index == Py_SIZE(self) - 1，证明弹出的是列表的最后一个元素 // 那么说明不涉及元素的移动，直接更新 ob_size 即可 if (index == Py_SIZE(self) - 1) { status = list_resize(self, Py_SIZE(self) - 1); if (status >= 0) return v; else return NULL; } Py_INCREF(v); // 删除的不是最后一个元素，那么需要调用 list_ass_slice 进行删除 // 等价于 self[index: index + 1] = []，即删除索引为 index 的元素 status = list_ass_slice(self, index, index+1, (PyObject *)NULL); if (status < 0) { Py_DECREF(v); return NULL; } return v;\n} 以上就是 pop 方法。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » pop：从尾部弹出一个元素","id":"155","title":"pop：从尾部弹出一个元素"},"156":{"body":"index 方法可以接收一个元素，然后返回该元素首次出现的位置。当然还可以额外指定一个 start 和 end，表示查询的范围。 // Objects/clinic/listobject.c.h\n#define LIST_INDEX_METHODDEF \\ {\"index\", (PyCFunction)(void(*)(void))list_index, METH_FASTCALL, list_index__doc__}, 它由 list_index 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_index(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; PyObject *value; Py_ssize_t start = 0; Py_ssize_t stop = PY_SSIZE_T_MAX; // index 方法接收 1 ~ 3 个参数 if (!_PyArg_CheckPositional(\"index\", nargs, 1, 3)) { goto exit; } // args[0] 表示查找的元素 value = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示查找的起始位置 if (!_PyEval_SliceIndexNotNone(args[1], &start)) { goto exit; } if (nargs < 3) { goto skip_optional; } // args[2] 表示查找的结束位置 if (!_PyEval_SliceIndexNotNone(args[2], &stop)) { goto exit; }\nskip_optional: // 调用 list_index_impl 查找元素 return_value = list_index_impl(self, value, start, stop); exit: // 返回 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_index_impl(PyListObject *self, PyObject *value, Py_ssize_t start, Py_ssize_t stop)\n{ Py_ssize_t i; // 如果 start 小于 0，那么加上列表长度 if (start < 0) { start += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (start < 0) start = 0; } // 如果结束位置小于 0，那么加上列表长度，所以它们都支持负数索引 if (stop < 0) { stop += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (stop < 0) stop = 0; } // 从 start 开始遍历 for (i = start; i < stop && i < Py_SIZE(self); i++) { // 获取对应元素 PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 然后进行比较，这个函数我们之前说过 // 它会先比较地址是否相同，如果地址相同，那么直接判定为相等 // 如果地址不同，那么比较值是否相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 相等返回 1，不相等返回 0，比较失败返回 -1 // 如果 cmp 大于 0，表示两者相等，返回索引 if (cmp > 0) return PyLong_FromSsize_t(i); else if (cmp < 0) return NULL; } // 到这里说明元素不存在，那么抛出 ValueError: x is not in list PyErr_Format(PyExc_ValueError, \"%R is not in list\", value); return NULL;\n} 所以列表 index 方法的时间复杂度为 O(n)，因为它在底层要循环整个列表，如果运气好，可能第一个元素就是；运气不好，就只能循环整个列表了。 然后需要注意的是，在比较的时候，会先判断地址是否相同，然后再比较值是否相等。 class A: def __eq__(self, other): return False a = A()\ndata = [a] print(a == data[0]) # False\nprint(data.index(a)) # 0 a 和 data[0] 指向的对象不相等，但 data.index(a) 却返回了相应的索引，因为两者保存的地址是相同的。 同理 if v in data 这种也是类似的，先比较地址，地址不同再比较维护的值。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » index：查询元素首次出现的位置","id":"156","title":"index：查询元素首次出现的位置"},"157":{"body":"列表有一个 count 方法，可以计算出某个元素出现的次数。 // Objects/clinic/listobject.c.h\n#define LIST_COUNT_METHODDEF \\ {\"count\", (PyCFunction)list_count, METH_O, list_count__doc__}, 它由 list_count 函数负责实现。 // Objects/listobject.c\nstatic PyObject *\nlist_count(PyListObject *self, PyObject *value)\n{ Py_ssize_t count = 0; Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { // 如果地址相同，直接判定为相等，count 自增 1 PyObject *obj = self->ob_item[i]; if (obj == value) { count++; continue; } Py_INCREF(obj); // 地址不同（a is b 不成立），则比较维护的值是否相等（看 a == b 是否成立） int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); if (cmp > 0) count++; else if (cmp < 0) return NULL; } // 返回元素出现的次数 return PyLong_FromSsize_t(count);\n} 毫无疑问，count 方法无论在什么情况下，它都是一个时间复杂度为 O(n) 的操作，因为列表必须要从头遍历到尾。 但还是要注意里面判断相等的方式，因为变量只是一个指针，所以 C 的 == 相当于 Python 的 is，但 Python 的 == 则对应 PyObject_RichCompare 函数。而源码里面在比较的时候先执行 ==，所以会先判断两者是不是指向同一个对象。 class A: def __eq__(self, other): return False a = A()\ndata = [a, a, a]\nprint(data[0] == a) # False\nprint(data[1] == a) # False\nprint(data[2] == a) # False print(data.count(a)) # 3 我们看到列表里的三个元素和 a 都不相等，但计算数量的时候，结果是 3。原因就是比较的时候是先比较地址，如果地址一样，那么认为元素相同。 当然 PyObject_RichCompareBool 函数里面已经包含了比较地址的逻辑，该函数会先比较地址是否一样，如果一样则认为相等，不一样再比较对象维护的值是否相等。但在 count 方法里面，将比较地址的逻辑又单独拿了出来，可以理解为快分支。当然即遍没有也无所谓，因为在函数 PyObject_RichCompareBool 里面还是会先对地址进行比较。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » count：查询元素出现的次数","id":"157","title":"count：查询元素出现的次数"},"158":{"body":"除了根据索引删除元素之外，也可以根据值来删除元素，会删除第一个出现的元素。 // Objects/clinic/listobject.c.h\n#define LIST_REMOVE_METHODDEF \\ {\"remove\", (PyCFunction)list_remove, METH_O, list_remove__doc__}, 它由 list_remove 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_remove(PyListObject *self, PyObject *value)\n{ Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 比较是否相等，如果地址相同，那么认为相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 如果相等，那么进行删除 if (cmp > 0) { // 可以看到在删除元素的时候，调用了 list_ass_slice // 等价于 self[i: i + 1] = [] if (list_ass_slice(self, i, i+1, (PyObject *)NULL) == 0) Py_RETURN_NONE; return NULL; } else if (cmp < 0) return NULL; } // 否则说明元素不在列表中，抛出 ValueError: list.remove(x): x not in list PyErr_SetString(PyExc_ValueError, \"list.remove(x): x not in list\"); return NULL;\n} 以上就是 remove 函数的底层实现，说白了就是一层 for 循环，依次比较列表的每个元素和待删除元素是否相等。如果出现了相等的元素，则删除，然后直接返回，因为只删除一个；但如果整个循环遍历结束也没有发现满足条件的元素，那么报错，待删除元素不存在。 所以背后的逻辑并没有我们想象中的那么神秘。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » remove：删除指定元素","id":"158","title":"remove：删除指定元素"},"159":{"body":"如果是你的话，你会怎么对列表进行翻转呢？显然是采用双指针，头指针指向列表的第一个元素，尾指针指向列表的最后一个元素，然后两两交换。交换完毕之后，头指针后移一位、尾指针前移一位，继续交换。当两个指针相遇时，停止交换，而 Python 底层也是这么做的。 // Objects/clinic/listobject.c.h\n#define LIST_REVERSE_METHODDEF \\ {\"reverse\", (PyCFunction)list_reverse, METH_NOARGS, list_reverse__doc__}, 它由 list_reverse 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_reverse(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_reverse_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_reverse_impl(PyListObject *self)\n{ // 如果列表长度不大于 1，那么什么也不做，直接返回 None 即可 if (Py_SIZE(self) > 1) // 大于 1 的话，执行 reverse_slice，传递了两个参数 // 第一个参数是底层数组首元素的地址 // 而第二个参数则是底层数组中索引为 ob_size 的元素的地址 // 但很明显能访问的最大索引应该是 ob_size - 1 才对啊 // 别急，我们继续往下看，看一下 reverse_slice 函数的实现 reverse_slice(self->ob_item, self->ob_item + Py_SIZE(self)); Py_RETURN_NONE;\n} static void\nreverse_slice(PyObject **lo, PyObject **hi)\n{ assert(lo && hi); // 我们看到又执行了一次 --hi // 让二级指针 hi 指向了索引为 ob_size - 1 的元素 --hi; // 数组元素的地址，从左往右是依次增大的 // 如果 lo < hi，证明 lo 依旧在 hi 的左边，那么交换指向的元素 // 如果 lo > hi，证明两者相遇了，交换结束 while (lo < hi) { // 交换指向的元素，下面三步等价于 *lo, *hi = *hi, *lo // 但 C 不支持这么写，它需要借助一个中间变量 PyObject *t = *lo; *lo = *hi; *hi = t; // 两个指针继续靠近，指向的元素继续交换，直到两个指针相遇 ++lo; --hi; }\n} 所以到现在，你还认为 Python 的列表神秘吗？虽然我们很难自己写出一个 Python 解释器，但是底层的一些思想其实并没有那么难，作为一名程序猿很容易想的到。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » reverse：翻转列表","id":"159","title":"reverse：翻转列表"},"16":{"body":"PyObject 是 Python 对象的核心，因为 Python 对象在 C 的层面就是一个结构体，并且所有的结构体都嵌套了 PyObject 结构体。而 PyObject 内部有引用计数和类型这两个字段，因此我们可以肯定的说 Python 的任何一个对象都有引用计数和类型这两个属性。 另外大部分对象都有长度的概念，所以又引入了 PyVarObject，它在 PyObject 的基础上添加了一个 ob_size 字段，用于描述对象的长度。比如字符串内部的 ob_size 维护的是字符串的字符个数，元组、列表、集合等等，其内部的 ob_size 维护的是存储的元素个数，所以使用 len 函数获取对象长度是一个 O(1) 的操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 小结","id":"16","title":"小结"},"160":{"body":"将列表中的元素全部清空，让列表回到初始状态。 // Objects/clinic/listobject.c.h\n#define LIST_CLEAR_METHODDEF \\ {\"clear\", (PyCFunction)list_clear, METH_NOARGS, list_clear__doc__}, 它由 list_clear 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_clear(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_clear_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_clear_impl(PyListObject *self)\n{ _list_clear(self); Py_RETURN_NONE;\n} static int\n_list_clear(PyListObject *a)\n{ Py_ssize_t i; PyObject **item = a->ob_item; if (item != NULL) { // 获取列表的长度 i = Py_SIZE(a); // 将 ob_size 设置为 0 Py_SIZE(a) = 0; // ob_item 设置为 NULL a->ob_item = NULL; // 将容量设置为 0 a->allocated = 0; // 将列表中每个元素指向的对象的引用计数减 1 while (--i >= 0) { Py_XDECREF(item[i]); } // 释放底层数组所占的内存 PyMem_FREE(item); } return 0;\n} 过程非常简单，当列表为空时，除了将 ob_size 和 allocated 设置为 0 之外，还会将底层数组释放掉，减少内存占用。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » clear：清空列表","id":"160","title":"clear：清空列表"},"161":{"body":"调用列表的 copy 方法，可以将列表拷贝一份。 // Objects/clinic/listobject.c.h\n#define LIST_COPY_METHODDEF \\ {\"copy\", (PyCFunction)list_copy, METH_NOARGS, list_copy__doc__}, 它由 list_copy 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_copy(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_copy_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_copy_impl(PyListObject *self)\n{ // 调用 list_slice，也就是基于切片获取元素 // 所以 data.copy() 等价于 data[:] return list_slice(self, 0, Py_SIZE(self));\n} static PyObject *\nlist_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)\n{ // 指向创建的新列表 PyListObject *np; // 指向列表的底层数组的首元素 PyObject **src, **dest; Py_ssize_t i, len; // 创建的新列表的长度 len = ihigh - ilow; // 创建底层数组长度为 len 的列表 np = (PyListObject *) list_new_prealloc(len); if (np == NULL) return NULL; src = a->ob_item + ilow; dest = np->ob_item; // 将原始列表中的元素依次拷贝到新列表中 for (i = 0; i < len; i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 len Py_SIZE(np) = len; // 转成泛型指针之后返回 return (PyObject *)np;\n} 过程非常简单，但列表的 copy 方法或者说 data[:] 这种叫做列表的浅拷贝。关于列表的深浅拷贝也是初学者容易犯的错误之一，我们看一个 Python 的例子。 data = [[]] # 默认是浅拷贝，这个过程会创建一个新列表\n# 但我们说列表里面的元素都是指针，因此只会将里面的指针拷贝一份\n# 而指针指向的内存并没有拷贝\ndata_cp = data.copy() # 两个对象的地址是一样的\nprint(id(data[0]), id(data[0])) \"\"\"\n1338344668224 1338344668224\n\"\"\" # 操作 data[0], 会改变 data_cp[0]\ndata[0].append(123)\nprint(data, data_cp)\n\"\"\"\n[[123]] [[123]]\n\"\"\" # 操作 data_cp[0]，会改变 data[0]\ndata_cp[0].append(456)\nprint(data, data_cp)\n\"\"\"\n[[123, 456]] [[123, 456]]\n\"\"\" 之所以会有这样的现象，是因为 Python 的变量、容器里面的元素都是泛型指针 PyObject *，在传递的时候会传递指针， 但是在操作的时候会操作指针指向的内存。所以 data.copy() 就是创建了一个新列表，然后把元素拷贝了过去，只不过元素都是指针。因为只是拷贝指针，没有拷贝指针指向的对象（内存），因此它们指向的是同一个对象。 但如果我们就想在拷贝指针的同时也拷贝指针指向的对象呢？答案是使用一个叫 copy 的模块。 import copy data = [[]]\n# 此时拷贝的时候，会把指针指向的对象也给拷贝一份\ndata_cp1 = copy.deepcopy(data)\ndata_cp2 = data[:] data[0].append(123)\nprint(data_cp1) # [[]]\nprint(data_cp2) # [[123]] # data[:] 这种方式也是浅拷贝，所以修改 data[0]，会影响 data_cp2[0]\n# 但是没有影响 data_cp1[0]，证明它们是相互独立的，因为指向的是不同的对象 浅拷贝示意图如下： 里面的两个指针数组存储的元素是一样的，都是同一个对象的地址。 深拷贝示意图如下： 里面的两个指针数组存储的元素是不一样的，因为是不同对象的地址。 注意：copy.deepcopy 虽然在拷贝指针的同时会将指针指向的对象也拷贝一份，但这仅仅是针对可变对象，而不可变对象是不会拷贝的。 import copy data = [[], \"古明地觉\"]\ndata_cp = copy.deepcopy(data) print(data[0] is data_cp[0]) # False\nprint(data[1] is data_cp[1]) # True 为什么会这样，其实原因很简单。因为不可变对象是不支持本地修改的，你若想修改只能创建新的对象并指向它。但这对其它的变量而言则没有影响，其它变量该指向谁就还指向谁。 因为 b = a 只是将 a 存储的对象的指针拷贝一份给 b，然后 a 和 b 都指向了同一个对象，至于 a 和 b 本身则是没有任何关系的。如果此时 a 指向了新的对象，是完全不会影响 b 的，b 还是指向原来的对象。 因此，如果一个指针指向的对象不支持本地修改，那么深拷贝不会拷贝对象本身，因为指向的是不可变对象，所以不会有修改一个影响另一个的情况出现。 关于列表还有一些陷阱： data = [[]] * 5\ndata[0].append(1)\nprint(data) # [[1], [1], [1], [1], [1]]\n# 列表乘上一个 n，等于把列表里面的元素重复 n 次\n# 但列表里面存储的是指针，也就是将指针重复 n 次\n# 所以上面的列表里面的 5 个指针存储的地址是相同的\n# 也就是说，它们都指向了同一个列表 # 这种方式创建的话，里面的指针都指向了不同的列表\ndata = [[], [], [], [], []]\ndata[0].append(1)\nprint(data) # [[1], [], [], [], []] # 再比如字典，在后续系列中会说\nd = dict.fromkeys([1, 2, 3, 4], [])\nprint(d) # {1: [], 2: [], 3: [], 4: []}\nd[1].append(123)\nprint(d) # {1: [123], 2: [123], 3: [123], 4: [123]}\n# 它们都指向了同一个列表 类似的陷阱还有很多，因此在工作中要注意，否则一不小心就会出现大问题。 总之记住三句话： 虽然 Python 一切皆对象，但我们拿到的其实是指向对象的指针； 变量在传递的时候本质上是将对象的指针拷贝一份，所以 Python 是变量的赋值传递、对象的引用传递； 操作变量（指针）的时候，会自动操作变量（指针）指向的内存。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » copy：列表的拷贝","id":"161","title":"copy：列表的拷贝"},"162":{"body":"到此关于列表的内容就介绍完了，作为 Python 中的万能容器，我们可以自由地添加、修改和删除元素。但在使用的时候要了解它的底层结构以及元素是如何存储的，应该在什么场景下使用列表，它的每个方法的时间复杂度是多少。 下一篇文章来介绍元组，或许你觉得自己在代码中很少创建元组，但其实它无处不在。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 小结","id":"162","title":"小结"},"163":{"body":"本篇文章来聊一聊元组，元组可以简单理解为不支持元素添加、修改、删除等操作的列表，也就是在列表的基础上移除了增删改操作。 所以从功能上来讲，元组只是列表的子集，那元组存在的意义是什么呢？首先元组可以作为字典的 key 以及集合的元素，因为字典和集合使用的数据结构是哈希表，它存储的元素一定是可哈希的，关于字典和集合我们后续章节会说。 而列表可以动态改变，所以列表不支持哈希。因此当我们希望字典的 key 是一个序列时，显然元组再适合不过了。比如要根据年龄和身高统计人数，那么就可以将年龄和身高组成元组作为字典的 key，人数作为字典的 value。所以元组可哈希，能够作为哈希表的 key，是元组存在的意义之一。当然元组还有其它作用，我们稍后再说。 元组如果可哈希，那么元组存储的元素必须都是可哈希的。只要有一个元素不可哈希，那么元组就会不可哈希。比如元组里面存储了一个列表，由于列表不可哈希，导致存储了列表的元组也会变得不可哈希。","breadcrumbs":"38. 解密元组的实现原理 » 楔子","id":"163","title":"楔子"},"164":{"body":"根据我们使用元组的经验，可以得出元组是一个变长对象，但同时又是一个不可变对象。 // Include/cpython/tupleobject.h\ntypedef struct { PyObject_VAR_HEAD PyObject *ob_item[1];\n} PyTupleObject; 以上是元组在底层对应的结构体，包含引用计数、类型、ob_size、指针数组。然后数组声明的长度虽然是 1，但我们可以当成 n 来用。然后我们再通过结构体的定义，来对比一下它和列表的区别。 元组没有 allocated、也就是容量的概念，这是因为它是不可变的，不支持 resize 操作。 元组对应的指针数组是定义在结构体里面的，可以直接对数组进行操作。而列表对应的指针数组是定义在结构体外面的，两者通过二级指针进行关联，也就是通过二级指针来间接操作指针数组。 至于为什么要这么定义，我们在最开始介绍对象模型的时候也说得很详细了。可变对象的具体元素不会保存在结构体内部，而是会维护一个指针，指针指向的内存区域负责存储元素。当发生扩容时，只需改变指针指向即可，从而方便内存管理。 基于结构体的定义，我们也能分析出元组所占的内存大小，显然它等于 24 + 8 * 元组长度。 >>> ().__sizeof__()\n24\n>>> (1,).__sizeof__()\n32\n>>> (1, 2).__sizeof__()\n40 结果没有问题。","breadcrumbs":"38. 解密元组的实现原理 » 元组的底层结构","id":"164","title":"元组的底层结构"},"165":{"body":"元组支持的操作我们就不看了，因为它只支持查询操作，并且和列表是高度相似的。这里我们直接来看元组的创建过程。正如列表一样，解释器为创建 PyTupleObject 也提供了类似的初始化方法，即 PyTuple_New。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // 参数 size 表示元组的长度 // op 指向创建的元组 PyTupleObject *op; // 循环变量 Py_ssize_t i; // size 必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // PyTuple_MAXSAVESIZE 是一个宏，显然和缓存池相关 // 关于缓存池我们一会儿再说\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { free_list[size] = (PyTupleObject *) op->ob_item[0]; numfree[size]--; _Py_NewReference((PyObject *)op); } else\n#endif // 当不使用缓存池时，要在系统堆上申请内存 { // size * sizeof(PyObject *) + sizeof(PyTupleObject) 便是元组大小 // 该值不能超过 PY_SSIZE_T_MAX，否则报错 if ((size_t)size > ((size_t)PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)) / sizeof(PyObject *)) { return PyErr_NoMemory(); } // 为 PyTupleObject 和长度为 size 的指针数组申请内存 // 然后将它的类型设置为 &PyTuple_Type，将 ob_size 设置为 size op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size); if (op == NULL) return NULL; } // 将指针数组中所有元素设置为 NULL for (i=0; i < size; i++) op->ob_item[i] = NULL;\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); /* extra INCREF so that this is never freed */ }\n#endif // 让 GC 进行跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 相信这种代码逻辑现在对你来说已经没有任何难度了，另外源码中还有几个宏，不过不重要，因此这里直接去掉了。 以上就是元组创建的过程，但里面隐藏了很多的细节没有说，下面我们来介绍元组的缓存池，然后将细节一一揭开。","breadcrumbs":"38. 解密元组的实现原理 » 元组是怎么创建的？","id":"165","title":"元组是怎么创建的？"},"166":{"body":"元组的缓存池也是通过数组来实现的。 // Objects/tupleobject.c #define PyTuple_MAXSAVESIZE 20\n#define PyTuple_MAXFREELIST 2000 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];\nstatic int numfree[PyTuple_MAXSAVESIZE]; 里面出现了两个宏： PyTuple_MAXSAVESIZE：缓存池的大小，默认为 20； PyTuple_MAXFREELIST：缓存池的每个元素都对应一条链表，该宏表示每条链表最多容纳多少个节点（稍后解释）； 从定义中可以看到，元组的缓存池大小是 20，而我们之前介绍的列表的缓存池大小是 80。但这里的 20 和 80 还稍微有些不同，80 指的是列表缓存池的大小，除此之外没有别的含义。而 20 除了表示元组缓存池的大小之外，它还表示只有当元组的长度小于 20，回收时才会被放入缓存池。 当元组的长度为 n 时（其中 n < 20)，那么在回收的时候该元组就会放在缓存池中索引为 n 的位置。假设回收的元组长度为 6，那么就会放在缓存池索引为 6 的位置。 但是问题来了，如果要回收两个长度为 6 的元组该怎么办？很简单，像链表一样串起来就好了。所以 free_list 里面虽然存储的是 PyTupleObject *，但每个 (PyTupleObject *)->ob_item[0]都存储了下一个 PyTupleObject *。 因此你可以认为 free_list 存储了 20 条链表的头结点的指针，每条链表上面挂着具有相同 ob_size 的 PyTupleObject。比如 free_list[n] 便指向了长度为 n 的 PyTupleObject 组成的链表的头结点，至于每条链表的节点个数由 numfree 维护，并且最大不能超过 PyTuple_MAXFREELIST，默认是 2000。 这里再来重新捋一下，元组的缓存池是一个数组，并且索引为 n 的位置回收的是元素个数（ob_size）为 n 的元组，并且 n 不超过 20。但这样的话，具有相同长度的元组不就只能缓存一个了吗？比如我们有很多个长度为 2 的元组都要缓存怎么办呢？显然将它们以链表的形式串起来即可，正如图中显示的那样。至于长度为 n 的元组究竟缓存了多少个，则由 numfree[n] 负责维护。假设 free_list[2] 这条链表上挂了 1000 个 PyTupleObject，那么 numfree[2] 就等于 1000，即长度为 2 的元组被缓存了 1000 个。 当再回收一个长度为 2 的元组时，那么会让该元组的 ob_item[0] 等于 free_list[2]，然后 free_list[2] 等于该元组、numfree[2]++。所以这里的每一条链表和浮点数缓存池是类似的，也是采用的头插法。 我们看一下放入缓存池的具体过程，显然这一步发生在元组销毁的时候。 // Objects/tupleobject.c\nstatic void\ntupledealloc(PyTupleObject *op)\n{ // 循环变量 Py_ssize_t i; // 回收的元组的长度 Py_ssize_t len = Py_SIZE(op); // 让 GC 不再跟踪 PyObject_GC_UnTrack(op); // 延迟释放，和列表是类似的 Py_TRASHCAN_BEGIN(op, tupledealloc) if (len > 0) { i = len; // 减少内部元素指向对象的引用计数，因为元组不再持有对它们的引用 while (--i >= 0) Py_XDECREF(op->ob_item[i]);\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度必须小于 20，即元组长度不超过 20 // 并且 numfree[index] 必须小于 2000，即每条链表最多缓存 2000 个元组 if (len < PyTuple_MAXSAVESIZE && numfree[len] < PyTuple_MAXFREELIST && Py_TYPE(op) == &PyTuple_Type) { // ob_item[0] 充当了链表的 next 指针 // 这里让 op->ob_item[0] 等于 free_list[index] // 然后让 free_list[index] 等于 op // 这样元组就缓存起来了，并成为链表新的头结点，即 free_list[index] op->ob_item[0] = (PyObject *) free_list[len]; // 然后维护一下链表的节点个数 numfree[len]++; free_list[len] = op; goto done; /* return */ }\n#endif } // 如果元组长度大于等于 20，或者缓存池已满，那么释放内存 Py_TYPE(op)->tp_free((PyObject *)op);\ndone: Py_TRASHCAN_END\n} tupledealloc 函数在销毁元组时，会尝试放入缓存池中。那么同理，在创建元组时，也会尝试从缓存池中获取。我们再回过头看一下 PyTuple_New 这个函数，重新解释一下里面的细节。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // ...\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度为 0 时比较特殊，一会单独说 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } // 当 0 < size < 20 时，直接通过 op = free_list[size] 从缓存池获取 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { // 元组取走后，别忘记让 free_list[size] 指向下一个元素 // 也就是 (PyTupleObject *) op->ob_item[0] free_list[size] = (PyTupleObject *) op->ob_item[0]; // 维护对应的链表长度 numfree[size]--; // 引用计数初始化为 1 _Py_NewReference((PyObject *)op); } else\n#endif // ...\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); }\n#endif _PyObject_GC_TRACK(op); return (PyObject *) op;\n} 到此，相信你已经明白元组的缓存池到底是怎么一回事了，说白了就是有 20 条链表，索引为 n 的链表存放长度为 n 的元组，因此可回收的元组的最大长度是 19。然后每条链表的长度小于 2000，也就是具有相同长度的元组最多回收 2000 个。至于链表的 next 指针，则由元组的 ob_item[0] 来充当，通过 ob_item[0] 来获取下一个元素。 >>> tpl = (1, 2, 3)\n>>> print(id(tpl))\n2279295395264\n>>>\n>>> del tpl # 放入缓存池\n>>>\n>>> tpl = (\"古明地觉\", \"古明地恋\", \"芙兰朵露\")\n>>> print(id(tpl))\n2279295395264 可以看到打印的地址是一样的，因为第一次创建的元组被重复利用了。 另外我们说缓存池的长度为 20，会缓存长度为 0 ~ 19 的元组，每种规格的元组最多缓存 2000 个。其实这个说法不太严谨，应该说长度为 1 ~ 19 的元组会缓存 2000 个。如果元组长度为 0，那么它对应的链表只会容纳一个元素，这也说明了不管我们创建多少个空元组，最终在内存中只会存在一个。 tpl1 = ()\ntpl2 = ()\ntpl3 = () print(id(tpl1) == id(tpl2) == id(tpl3)) # True 再来看看 PyTuple_New 这个函数： 从缓存池中获取之后只是增加了引用计数，因为长度为 0 的元组只会缓存一个。所以空元组可以认为是单例的，只有一份。 那么问题来了，为什么元组缓存池可以缓存的元组个数会这么多，每个链表缓存 2000 个，有 20 条链表，总共可以缓存将近 40000 个。这么做的原因就是，元组的使用频率远比我们想象的广泛，主要是它大量使用在我们看不到的地方。比如多元赋值： a, b, c, d = 1, 2, 3, 4 在编译时，上面的 1, 2, 3, 4 实际上是作为元组被加载的，整个赋值相当于元组的解包。再比如函数、方法的返回值，如果是多返回值，本质上也是包装成一个元组之后再返回。 所以元组缓存池能缓存的对象个数，要远大于其它对象的缓存池。可以想象一个大型项目，里面的函数、方法不计其数，只要是多返回值，就会涉及到元组的创建，因此每种长度的元组缓存 2000 个是很合理的。当然如果长度达到了 20，就不会缓存了，这种元组的使用频率没有那么高。 然后再回顾一下元组的回收过程，会发现它和列表有一个很大的不同。列表在被回收时，它的指针数组会被释放；但元组不同，它在被回收时，底层的指针数组会保留，并且还巧妙地通过索引来记录了回收的元组的大小规格。元组的这项技术也被称为静态资源缓存，因为元组在执行析构函数时，不仅对象本身没有被回收，连底层的指针数组也被缓存起来了。那么当再次分配时，速度就会快一些。 from timeit import timeit t1 = timeit(stmt=\"x1 = [1, 2, 3, 4, 5]\", number=1000000)\nt2 = timeit(stmt=\"x2 = (1, 2, 3, 4, 5)\", number=1000000) print(round(t1, 2)) # 0.05\nprint(round(t2, 2)) # 0.01 可以看到耗时，元组只是列表的五分之一。这便是元组的另一个优势，可以将资源缓存起来。而缓存的原因还是如上面所说，因为涉及大量的创建和销毁，所以这一切都是为了加快内存分配。 由于对象都在堆区，为了效率，Python 不得不大量使用缓存的技术。","breadcrumbs":"38. 解密元组的实现原理 » 元组的缓存池","id":"166","title":"元组的缓存池"},"167":{"body":"以上就是元组相关的内容，因为有了列表相关的经验，再来看元组就会快很多。当然啦，元组的一些操作我们没有说，因为和对应的列表操作是类似的。 最后再补充一下，列表是有 __init__ 方法的，而元组没有。 元组的 __init__ 直接继承 object.__init__。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"38. 解密元组的实现原理 » 小结","id":"167","title":"小结"},"168":{"body":"Python 的字典是一种映射型容器对象，保存了键（key）到值（value）的映射关系。通过字典，我们可以实现快速查找，JSON 这种数据结构也是借鉴了 Python 的字典。另外字典是经过高度优化的，因为 Python 底层也在大量地使用字典。 在 Python 里面我们要如何创建一个字典呢？ # 创建一个字典\nd = {\"a\": 1, \"b\": 2}\nprint(d) # {'a': 1, 'b': 2} # 或者我们还可以调用 dict，传入关键字参数即可\nd = dict(a=1, b=2, c=3, d=4)\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然 dict 里面还可以接收位置参数，但是最多接收一个\nd1 = dict({\"a\": 1, \"b\": 2}, c=3, d=4)\nd2 = dict([(\"a\", 1), (\"b\", 2)], c=3, d=4)\nprint(d1) # {'a': 1, 'b': 2, 'c': 3, 'd': 4}\nprint(d2) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 还可以根据已有字典创建新的字典\nd = {**{\"a\": 1, \"b\": 2}, \"c\": 3, **{\"d\": 4}}\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然通过调用 dict 也是可以的\n# 但是注意：** 这种方式本质上是把字典变成多个关键字参数\n# 所以里面的 key 一定要符合 Python 的变量命名规范\nd = dict(**{\"a\": 1, \"b\": 2}, c=3, **{\"d\": 4})\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} try: # 这种是不合法的，因为 **{1: 1} 等价于 1=1 d = dict(**{1: 1})\nexcept Exception as e: print(e) # keywords must be strings\n# 但下面是合法的\nd = {**{1: 1, 2: 2}}\nprint(d) # {1: 1, 2: 2} 字典的底层是借助哈希表实现的，关于哈希表我们一会儿说，总之字典添加元素、删除元素、查找元素等操作的平均时间复杂度是 O(1)。 我们来测试一下字典的执行效率吧，看看它和列表之间的区别。 import time\nimport numpy as np def test(count: int, value: int): \"\"\" :param count: 循环次数 :param value: 查询的元素 :return: \"\"\" # 包含一千个随机数的列表 lst = list(np.random.randint(0, 2 ** 30, size=1000)) # 基于列表构建一个字典 d = dict.fromkeys(lst) # 查询元素 value 是否在列表中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in lst t2 = time.perf_counter() print(\"列表查询耗时:\", round(t2 - t1, 2)) # 查询元素 value 是否在字典中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in d t2 = time.perf_counter() print(\"字典查询耗时:\", round(t2 - t1, 2)) # 分别查询一千次、一万次、十万次、二十万次\ntest(10 ** 3, 22333)\n\"\"\"\n列表查询耗时: 0.13\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 4, 22333)\n\"\"\"\n列表查询耗时: 1.22\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 5, 22333)\n\"\"\"\n列表查询耗时: 12.68\n字典查询耗时: 0.01\n\"\"\"\ntest(10 ** 5 * 2, 22333)\n\"\"\"\n列表查询耗时: 25.72\n字典查询耗时: 0.01\n\"\"\" 字典的查询速度非常快，从测试中我们看到，随着循环次数越来越多，列表所花费的总时间越来越长。但是字典由于查询所花费的时间极少，查询速度非常快，所以即便循环 50 万次，花费的总时间也不过才 0.01 秒左右。 此外字典还有一个特点，就是它的快不会受到数据量的影响，从含有一万个键值对的字典中查找，和从含有一千万个键值对的字典中查找，两者花费的时间几乎是没有区别的。 那么哈希表到底是什么样的数据结构，为什么能这么快呢？下面来分析一下。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 楔子","id":"168","title":"楔子"},"169":{"body":"映射型容器的使用场景非常广泛，基本上所有的主流语言都支持。例如 C++ 里面的 map 就是一种映射型容器，但它是基于红黑树实现的。红黑树是一种平衡二叉树，元素的插入、删除、查询等操作的时间复杂度均为 O(logN)，另外 Linux 的 epoll 也使用了红黑树。 而对于 Python 来讲，映射型容器指的就是字典，我们说字典在 Python 内部是被高度优化的。因为不光我们在用，虚拟机在运行时也在大量使用，比如类对象、自定义类的实例对象都有自己的属性字典，还有全局变量也是通过字典存储的。因此基于以上种种原因，Python 对字典的性能要求会更加苛刻。 所以 Python 字典采用的数据结构，在添加、删除、查询元素等方面肯定是要优于红黑树的，没错，就是哈希表。其原理是将 key 通过哈希函数进行运算，得到一个哈希值，再将这个哈希值映射成索引。 我们举例说明： 我们发现除了 key、value 之外，还有一个 index，因为哈希表本质上也是使用了索引。虽然数组在遍历的时候是个时间复杂度为 O(n) 的操作，但通过索引定位元素则是一个 O(1) 的操作，不管数组有多长，通过索引总是能瞬间定位到指定元素。 所以哈希表本质上就是一个数组，通过将 key 映射成一个数值，作为数组的索引，然后将键值对存在数组里面。至于它是怎么映射的，我们后面再谈，现在就假设是按照我们接下来说的方法映射的。 比如这里有一个能容纳 8 个元素的字典，如上图所示。我们先设置 d[\"koishi\"]=79，那么会对 \"koishi\" 这个字符串进行哈希运算，得到一个哈希值，然后再让哈希值对当前的总容量进行取模，这样的话是不是能够得到一个小于 8 的数呢？假设是 3，那么就存在索引为 3 的位置。 然后 d[\"scarlet\"]=95，按照同样的规则运算得到 6，那么就存在索引为 6 的位置；同理第三次设置 d[\"satori\"]=80，对字符串 satori 进行哈希、取模，得到 1，那么存储在索引为 1 的位置。 同理当我们根据键来获取值的时候，比如：d[\"satori\"]，那么同样会对字符串 \"satori\" 进行哈希、取模，得到索引发现是1，然后就把索引为 1 的 value 给取出来。 当然这种方式肯定存在缺陷，比如： 不同的 key 进行哈希、取模运算之后得到的结果一定是不同的吗？ 在运算之后得到索引的时候，发现这个位置已经有人占了怎么办？ 取值的时候，索引为 1，可如果索引为 1 对应的 key 和我们指定的 key 不一致怎么办？ 所以哈希运算是会冲突的，如果冲突，那么 Python 底层会改变策略重新映射，直到映射出来的索引没有人用。比如我们设置一个新的键值对 d[\"tomoyo\"]=88，可是 \"tomoyo\" 这个 key 映射之后得到的结果也是 1，而索引为 1 的地方已经被 key 为 \"satori\" 的键值对给占了，那么 Python 就会改变规则来对 \"tomoyo\" 重新映射，直到找到一个空位置。 但如果我们再次设置 d[\"satori\"]=100，那么对 satori 映射得到的结果也是 1，而 key 是一致的，那么就会把对应的值进行修改。 同理，当我们获取值的时候，比如 d[\"tomoyo\"]，那么对 key 进行映射，得到索引。但是发现该索引对应的 key 不是 \"tomoyo\" 而是 \"satori\"，于是改变规则（这个规则跟设置 key 冲突时，采用的规则是一样的），重新映射，得到新的索引，然后发现 key 是一致的，于是将值取出来。 所以从这里就已经能说明问题了，就是把 key 转换成数组的索引。可能有人问，这些键值对貌似不是连续的啊。对的，肯定不是连续的。并不是说你先存，你的索引就小、就在前面，这是由 key 进行哈希运算之后的结果决定的。 另外哈希表、或者说字典也会扩容，并且它还不是像列表那样，容量不够才扩容，而是当键值对个数达到容量的三分之二的时候就会扩容。 因为字典不可能会像列表那样，键值对之间是连续、一个一个挨在一起的。既然是哈希运算，得到的哈希值肯定是随机的，再根据哈希值映射出的索引也是随机的。那么在键值对个数达到容量三分之二的时候，计算出来的索引发生碰撞的概率会非常大，不可能等到容量不够了再去扩容，而是在键值对个数达到容量的三分之二时就要扩容，也就是申请一个更大的哈希表。 一句话总结：哈希表就是一种空间换时间的方法。 假设容量为 1024，那么就相当于数组有 1024 个位置，每个 key 都会映射成索引，找到自己的位置，将键值对存在里面。但很明显各自的位置是不固定的，肯定会空出来很多，但是无所谓，只要保证通过索引能在相应的位置找到它即可。 大量的文字会有些枯燥，我们用两张图来解释一下设置元素和获取元素的整个过程。 以上是设置元素，还是比较清晰的，果然图像是个好东西。再来看看获取元素： 以上就是哈希表的基本原理，说白了它就是个数组。存储键值对的时候，先将 key 映射成索引，然后基于索引找到数组中的指定位置，将键值对存进去。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 什么是哈希表","id":"169","title":"什么是哈希表"},"17":{"body":"通过 PyObject 和 PyVarObject，我们看到了所有对象的公共信息以及变长对象的公共信息。任何一个对象，不管它是什么类型，内部必有引用计数（ob_refcnt）和类型指针（ob_type）。任何一个变长对象，不管它是什么类型，内部除了引用计数和类型指针之外，还有一个表示元素个数的 ob_size。 显然目前没有什么问题，一切都是符合预期的，但是当我们顺着时间轴回溯的话，就会发现端倪。比如： 当在内存中创建对象、分配空间的时候，解释器要给对象分配多大的空间？显然不能随便分配，那么对象的内存信息在什么地方？ 对象是可以执行相关操作的，解释器怎么知道某个对象支持哪些操作呢？再比如一个整数可以和一个整数相乘，一个列表也可以和一个整数相乘，即使是相同的操作，但不同类型的对象执行也会有不同的效果，那么此时解释器又是如何进行区分的？ 想都不用想，这些信息肯定都在对象的类型对象中。因为占用的空间大小实际上是对象的一个元信息，这样的元信息和其所属类型是密切相关的，因此它一定会出现在与之对应的类型对象当中。至于支持的操作就更不用说了，我们平时自定义类的时候，功能函数都写在什么地方，显然都是写在类里面，因此一个对象支持的操作也定义在类型对象当中。 而将对象和它的类型对象关联起来的，毫无疑问正是该对象内部的 PyObject 的 ob_type 字段，也就是类型指针。我们通过对象的 ob_type 字段即可获取类型对象的指针，然后通过指针获取存储在类型对象中的某些元信息。 下面我们来看看类型对象在底层是怎么定义的。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 楔子","id":"17","title":"楔子"},"170":{"body":"目前介绍的正是 Python 早期所采用的哈希表，但是它有一个严重的问题，就是内存浪费严重。下一篇文章我们就来看看字典的底层结构，以及 Python 是如何对哈希表进行优化的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 小结","id":"170","title":"小结"},"171":{"body":"本篇文章来剖析一下字典的底层结构，看看它是怎么设计的，以及在设计的过程中都需要做哪些考量。另外字典是基于哈希表实现的，而传统的哈希表存在内存浪费的问题，那么字典又是如何优化的呢？带着这些问题，开始今天的内容。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 楔子","id":"171","title":"楔子"},"172":{"body":"Python 一切皆对象，字典也不例外，它在底层也由某个结构体表示。 // Include/cpython/dictobject.h\ntypedef struct { PyObject_HEAD Py_ssize_t ma_used; uint64_t ma_version_tag; PyDictKeysObject *ma_keys; PyObject **ma_values;\n} PyDictObject; 解释一下里面的字段的含义： PyObject_HEAD：对象的头部信息，里面包含了对象的引用计数和类型。 ma_used：字典的长度，它充当了 ob_size。 ma_version_tag：字典的版本号，对字典的每一次修改都会导致其改变。该字段主要用于字典的迭代器，以检测字典在迭代过程中是否被修改。 ma_keys：从定义上来看它是一个指针，指向了 PyDictKeysObject。而 Python 里面的哈希表分为两种，分别是 combined table 和 split table，即结合表和分离表。如果是结合表，那么键值对全部由 ma_keys 维护，此时 ma_values 为 NULL。 ma_values：如果是分离表，那么键由 ma_keys 维护，值由 ma_values 维护。而 ma_values 是一个二级指针，指向 PyObject * 类型的指针数组的首元素。 这里先解释一下结合表和分离表的由来。结合表的话，键和值会存在一起；分离表的话，键和值会存在不同的地方。那么问题来了，为什么要将哈希表分为两种呢？事实上，早期的哈希表只有结合表这一种，并且现在创建一个字典使用的也是结合表。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d = {\"a\": 1, \"b\": 2}\nprint( PyDictObject.from_address(id(d)).ma_values\n) # None 我们看到 ma_values 打印的结果是一个 None，证明是结合表，值不是由 ma_values 维护，而是和键一起，都由 ma_keys 负责维护。 而分离表是在 PEP-0412 中被引入的，主要是为了提高内存使用率，也就是让不同的字典共享相同的一组 key。比如自定义类的实例对象，它们默认都有自己的属性字典，如果对某个类多次实例化，那么改成分离表会更有效率。因为它们的属性名称是相同的，完全可以共享同一组 key；如果是结合表，那么每个实例的属性字典都要将相同的 key 单独保存一次，这显然是一种浪费。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] class A: pass a1 = A()\na2 = A() # 因为类型指定的是 void *，所以打印的结果是一串地址\n# 但我们看到输出不为 None，说明采用的确实是分离表\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_values, PyDictObject.from_address(id(a2.__dict__)).ma_values\n) # 139672411587664 139672411587280 # 然后再查看 ma_keys，既然是共享同一组 key\n# 那么打印的地址应该是一样的\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_keys, PyDictObject.from_address(id(a2.__dict__)).ma_keys\n) # 139672411702528 139672411702528 # 结果确实是一样的，不同实例对象的属性字典里面的 key 是共享的\n# 因为是同一个类的实例对象，属性字典的 key 是相同的，所以没必要将同一组 key 保存多次 以上就是结合表和分离表之间的区别，只需要知道分离表是 Python 为了提高内存使用率而专门引入的即可。我们平时自己创建的字典，使用的都是结合表，因此我们的重点也将会放在结合表身上。 而结合表的话，键值都由 ma_keys 维护，它是一个指向 PyDictKeysObject 的指针，因此玄机就隐藏在这个结构体里面。 // Include/cpython/dictobject.h\ntypedef struct _dictkeysobject PyDictKeysObject; // Objects/dict-common.h\nstruct _dictkeysobject { // key 的引用计数，也就是 key 被多少个字典所使用 // 如果是结合表，那么该字段始终是 1，因为结合表独占一组 key // 如果是分离表，那么该字段大于等于 1，因为分离表可以共享一组 key Py_ssize_t dk_refcnt; // 哈希表的大小、或者说长度，注意：dk_size 满足 2 的 n 次方 // 这样可将取模运算优化成按位与运算，也就是将 num % dk_size 优化成 num & (dk_size - 1) Py_ssize_t dk_size; // 哈希函数，用于计算 key 的哈希值，然后映射成索引 // 一个好的哈希函数应该尽可能少的产生冲突，并且哈希函数对哈希表的性能起着至关重要的作用 // 所以底层的哈希函数有很多种，会根据对象的种类选择最合适的一个 dict_lookup_func dk_lookup; // 键值对数组还可以添加多少个 entry（键值对） // 关于什么是键值对数组，以及它和哈希索引数组之间有什么区别，稍后会解释 Py_ssize_t dk_usable; // 键值对数组里面已经添加了多少个键值对 Py_ssize_t dk_nentries; // 哈希索引数组 char dk_indices[]; // 注：dk_indices 后面其实还有一个字段 dk_entries，只不过没有写在结构体里面 // 从字段名也可以看出，它表示键值对数组，因此它的类型就是个数组 // 然后数组里面存储的是键值对（entry），而键值对在底层由 PyDictKeyEntry 结构体实现 // 所以你可以认为 char dk_indices[] 的下面还有一个 PyDictKeyEntry dk_entries[]\n}; 字典的定义还是稍微有点复杂的，如果目前感到困惑，没有关系，稍后我们会一点点解释清楚。这里再来看看键值对长什么样子。 // Objects/dict-common.h\ntypedef struct { Py_hash_t me_hash; PyObject *me_key; PyObject *me_value;\n} PyDictKeyEntry; 显然 me_key 和 me_value 指向了键和值，我们之前说 Python 的变量、以及容器内部的元素都是泛型指针 PyObject *，这里也得到了证明。但是我们看到 entry 除了有键和值之外，还有一个 me_hash，它表示键对应的哈希值，这样可以避免重复计算。 至此，字典的整个底层结构就非常清晰了，我们画一张图，然后再来从头解释一下，并解答之前留下的疑问。 字典的真正实现藏在 PyDictKeysObject 中，它的内部包含两个关键数组：一个是哈希索引数组 dk_indices，另一个是键值对数组 dk_entries。 字典维护的键值对（entry）会按照先来后到的顺序保存在键值对数组中，而哈希索引数组则保存键值对在键值对数组中的索引。另外，哈希索引数组中的一个位置我们称之为一个槽，比如图中的哈希索引数组便有 8 个槽，其数量由 dk_size 字段维护。 假设我们创建一个空字典，注意：虽然字典是空的，但是容量已经有了，然后往里面插入键值对 \"komeiji\": 99 的时候，Python 会执行以下步骤： 将键值对保存在 dk_entries 中，由于初始字典是空的，所以会保存在 dk_entries 数组中索引为 0 的位置。 通过哈希函数计算出 \"komeiji\" 的哈希值，然后将哈希值映射成索引，假设是 6。 将 \"键值对\" 在 \"键值对数组\" 中的索引 0，保存在哈希索引数组中索引为 6 的槽里面。 然后当我们在查找键 \"komeiji\" 对应的值的时候，便可瞬间定位。过程如下： 通过哈希函数计算出 \"komeiji\" 的哈希值，然后映射成索引。因为在设置的时候索引是 6，所以在获取时，映射出来的索引肯定也是 6。 找到哈希索引数组中索引为 6 的槽，得到其保存的 0，这里的 0 对应键值对数组的索引。 找到键值对数组中索引为 0 的位置存储的 entry，然后判断 entry->me_key 和查找的 key 是否一致，不一致则重新映射。如果一致，则取出 me_value，然后返回。 由于哈希值计算以及数组索引查找均是 O(1) 的时间复杂度，所以字典的查询速度才会这么快。 另外前面介绍哈希表的时候，为了避免牵扯太多，说得相对简化了。比如 \"xxx\": 80，假设 \"xxx\" 映射出来的索引是 2，那么键值对就直接存在索引为 2 的地方。这实际上是简化了，因为这相当于把哈希索引数组和键值对数组组合在一块了，而早期的 Python 也确实是这么做的。 但是从上面字典的结构图中我们看到，实际上是先将键值对按照先来后到的顺序存在一个数组（键值对数组）中，然后再将它在键值对数组中的索引存放在另一个数组（哈希索引数组）的某个槽里面，因为 \"xxx\" 映射出来的是 2，所以就存在索引为 2 的槽里面。 而在查找的时候，映射出来的索引其实是哈希索引数组的索引。然后索引为 2 的槽又存储了一个索引，这个索引是键值对数组的索引，会再根据该索引从键值对数组里面获取指定的 entry。最后比较 key 是否相同、如果相同则返回指定的 value。 所以能看出两者整体思想是基本类似的，理解起来区别不大，甚至第一种方式实现起来还更简单一些。但为什么要采用后者这种实现方式，以及这两者之间的区别，我们下面来专门分析，之所以采用后者主要是基于内存的考量。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的底层结构","id":"172","title":"字典的底层结构"},"173":{"body":"在早期，哈希表并没有分成两个数组实现，而是只由一个键值对数组实现，这个数组也承担哈希索引数组的角色。 我们看到这种结构不正是我们在介绍哈希表时说的吗？键值对数组不仅负责存储 entry，同时也负责承载映射后的索引，而无需分成两个数组，这种方式似乎更简单、更直观。没错，Python 在早期确实是通过这种方式实现的哈希表，只是这种实现方式有一个弊端，就是太耗费内存了。 前面说了，基于 key 映射出的索引是随机的，所以肯定会存在索引冲突的情况，即不同的 key 映射到了同一个槽。并且随着存储的 entry 增多，冲突也会越频繁，性能也就越差。因此哈希表必须要预留一定的空间，而经过实践表明，预留的空间至少要占总容量的 1/3。换句话说，哈希表存储的 entry 的数量不能超过总容量的 2/3。 // Objects/dictobject.c\n#define USABLE_FRACTION(n) (((n) << 1)/3) 宏 USABLE_FRACTION 会根据哈希表的长度，或者说容量，计算出哈希表可存储的元素个数。以长度为 8 的哈希表为例，最多可以保存 5 个键值对，超出则需要扩容，显然这存在严重的内存浪费。 所以 Python 为了节省内存，想出了一个妙招。既然只能用 2/3，那就将键值对数组的空间变为原来的 2/3，只用来存储键值对（entry），而对 key 进行映射得到的索引则由另一个数组（哈希索引数组）来承载。假设映射出的索引是 4，那么就去找哈希索引数组中索引为 4 的槽，该槽存储的便是键值对在键值对数组中的索引。 之所以这么设计，是因为键值对数组里面一个元素要占用 24 字节，而哈希索引数组在容量不超过 255 的时候，里面一个元素只占一个字节，容量不超过 65535 的时候，里面一个元素只占两个字节，其它以此类推。所以哈希索引数组里面的元素大小比键值对数组要小很多，将哈希表分成两个数组（避免键值对数组的浪费）来实现会更加节省内存。我们可以举个例子计算一下，假设有一个容量为 65535 的哈希表。 如果是通过第一种方式，只用一个数组来存储的话： # 总共需要 1572840 字节\n>>> 65535 * 24\n1572840 # 除以 3, 会浪费 524280 字节\n>>> 65535 * 24 // 3\n524280\n>>> 如果是通过第二种方式，使用两个数组来存储的话： # 容量虽然是 65535\n# 但键值对数组是容量的 2 / 3\n# 然后加上哈希索引数组的大小\n>>> 65535 * 24 * 2 // 3 + 65535 * 2\n1179630\n>>> 所以一个数组存储比两个数组存储要多用 393210 字节的内存，因此 Python 选择使用两个数组来存储。 我们再以长度为 8 的哈希表为例，画一张图对比一下，由于哈希表长度为 8，那么它最多存储 5 个键值对。 如果哈希表只使用一个键值对数组，那么基于 key 映射出的索引就是键值对数组的索引，这种方式简单直观，但内存浪费严重，因为要浪费掉 1/3 的空间。于是为了解决这个问题，哈希表选择使用两个数组实现，分别是哈希索引数组和键值对数组。 哈希索引数组的长度就是哈希表的长度，key 映射之后的索引也是哈希索引数组的索引，只不过它存储的不再是键值对，而是键值对在键值对数组中的索引。那么问题来了，明明多了一个数组，为啥内存占用反而变少了呢？很明显，由于引入了哈希索引数组，键值对数组的长度可以减少到原来的 2/3。 因为相比键值对数组，哈希索引数组的内存占用非常低，引入它需要的成本远小于避免键值对数组浪费 1/3 所带来的收益，所以使用两个数组来实现哈希表是更加合理的。 总结： 哈希表本质上就是个数组，只不过 Python 选择使用两个数组实现，其中哈希索引数组的长度便是哈希表的容量，而该长度由 dk_size 字段维护。 由于哈希表最多使用 2/3，那么就只为键值对数组申请 2/3 容量的空间。对于容量为 8 的哈希表，那么哈希索引数组的长度就是 8，键值对数组的长度就是 5。 dk_usable 字段表示键值对数组还可以容纳的 entry 的个数，所以它的初始值也是 5。 dk_nentries 字段表示当前已存在的 entry 的数量，假设哈希表，或者说键值对数组存储了 3 个键值对，那么 dk_nentries 就是 3。而 dk_usable 则会变成 5 - 3 等于 2，因为它表示键值对数组还可以容纳多少 entry。 咦，前面介绍 PyDictObject 的时候，看到里面有一个 ma_used 字段，表示字典的长度。那么 dk_nentries 和 ma_used 有啥区别呢，从字面意思上看，两者的含义貌似是等价的，关于这一点后续再解释。 最后就是 dk_indices 和 dk_entries，它们表示哈希索引数组和键值对数组。到此我们就把每个字段的含义又重新回顾了一遍，现在再来看是不是就清晰多了呢。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 哈希表的内存优化","id":"173","title":"哈希表的内存优化"},"174":{"body":"我们知道 Python 从 3.6 开始，字典的遍历是有序的，那么这是怎么实现的呢？ 其实很简单，在存储时，虽然映射之后的索引是随机的，但键值对本身始终是按照先来后到的顺序被添加进键值对数组中。而字典在 for 循环时，会直接遍历键值对数组，所以遍历的结果是有序的。但即便如此，我们也不应该依赖此特性。 还是以之前的图为例，我们顺序写入三个键值对，key 分别是 \"a\"、\"b\"、\"c\"： 早期的哈希表只有一个键值对数组，而键值对在存储时本身就是无序的，那么遍历的结果自然也是无序的。对于当前来说，遍历的结果就是 \"b\"、\"a\"、\"c\"。 但从 3.6 开始，键值对数组中的键值对，和添加顺序是一致的。而遍历时，会直接遍历键值对数组，因此遍历的结果是有序的。对于当前来说，遍历的结果就是 \"a\"、\"b\"、\"c\"。 当然，如果你是 Python 的设计者，希望遍历依旧不保持有序的话，那么该怎么做呢？很简单，可以先遍历哈希索引数组，将存储的有效索引依次取出，对于当前来说就是 1、0、2。然后基于这些索引，从键值对数组中获取键值对，那么遍历的结果也是 \"b\"、\"a\"、\"c\"。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典遍历的有序性","id":"174","title":"字典遍历的有序性"},"175":{"body":"下面来分析一下字典占用的内存大小，首先字典和列表一样都有容量的概念，由于空间已经申请了，不管有没有使用，大小都必须算进去。而字典的容量策略相比列表要简单很多，因为大小要满足 2 的 n 次方，所以容量一定按照 8、16、32、64、······ 进行变化。 注意：字典的容量（或者说哈希表的容量）指的是内部哈希索引数组的长度，它要满足 2 的 n 次方，从而将取模运算优化成按位与运算。当哈希索引数组存储的元素（键值对数组的索引）个数达到了总长度的 2/3，同时也意味着键值对数组已经满了，那么说明字典（哈希表）该扩容了。 知道了容量规则，我们来看一下字典的内存大小怎么计算。 typedef struct { PyObject_HEAD // 16 字节 Py_ssize_t ma_used; // 8 字节 uint64_t ma_version_tag; // 8 字节 PyDictKeysObject *ma_keys; // 8 字节 PyObject **ma_values; // 8 字节\n} PyDictObject;\n// 所以 PyDictObject 实例占 48 字节 struct _dictkeysobject { Py_ssize_t dk_refcnt; // 8 字节 Py_ssize_t dk_size; // 8 字节 dict_lookup_func dk_lookup; // 8 字节 Py_ssize_t dk_usable; // 8 字节 Py_ssize_t dk_nentries; // 8 字节 char dk_indices[]; // 隐藏字段 dk_entries\n}; // 如果不算哈希索引数组 dk_indices 和键值对数组 dk_entries\n// 那么 PyDictKeysObject 实例占 40 个字节 然后是剩余的两个数组，一个是哈希索引数组 dk_indices，里面 1 个元素可能占 1 字节、2 字节、或 4 字节；还有一个键值对数组 dk_entries，里面一个元素占 24 字节。所以对于容量为 n 的字典来说： 如果 n < 256，字典大小等于 48 + 40 + n + n * 2 // 3 * 24 如果 256 <= n < 65536，字典大小等于 48 + 40 + n * 2 + n * 2 // 3 * 24 如果 n >= 65536，字典大小等于 48 + 40 + n * 4 + n * 2 // 3 * 24 所以对于一个容量为 8 的字典，它的大小就是 48 + 40 + 8 + 120 = 216。 # 字典的初始容量为 8，所以大小为 216\n>>> dict().__sizeof__()\n216 # 注：如果你是通过字面量的方式创建空字典，那么容量是 0\n# 显然大小就是 48 字节，因为此时 ma_keys 为 NULL\n>>> {}.__sizeof__()\n48 那么问题来了，如果一个字典包含 78 个键值对，那么这个字典占多大内存呢？既然有 78 个键值对，那么键值对数组 dk_entries 的长度至少为 78，而它又等于哈希表容量的 2/3，所以哈希表的长度至少为 117。由于哈希表的长度满足 2 的 n 次幂，所以我们只需找到大于等于 117 的最小 2 的幂次方数即可，显然这个数是 128。 所以大小有了，包含 78 个键值对的字典所占的内存大小等于 48 + 40 + 128 + 128 * 2 // 3 * 24。 >>> 48 + 40 + 128 + 128 * 2 // 3 * 24\n2256\n>>> dict.fromkeys(range(78)).__sizeof__()\n2256 结果没有问题，再来个复杂点的，对于包含 12345 个键值对的字典，占用多大内存呢？ >>> import math\n>>> math.log2(12345 * 3 / 2)\n14.1766017167513\n>>> 2 ** 15\n32768 计算结果表明，对于包含 12345 个键值对的字典，哈希表的长度至少为 2 的 14.17... 次方，而实际的长度显然是 2 的 15 次方，那么大小就出来了。另外注意：因为长度超过了 255，所以哈希索引数组中的一个元素占两字节。 >>> 48 + 40 + 32768 * 2 + 32768 * 2 // 3 * 24\n589904\n>>> dict.fromkeys(range(12345)).__sizeof__()\n589904 结果和我们分析的一样，以上我们就计算出了字典的内存大小，你也可以自己创建个字典测试一下。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的内存大小","id":"175","title":"字典的内存大小"},"176":{"body":"通过研究字典的具体实现，我们可以得出以下结论： 字典是一种高效的映射型容器，能够以 O(1) 的时间复杂度执行查询和写入操作； 字典之所以这么快，是因为它由哈希表实现。但快是要付出代价的，哈希表必须保证一定的稀疏性，否则会频繁出现索引冲突，导致哈希表性能下降，因为索引映射是随机的； 既然哈希表要保证稀疏性，就意味着内存开销大，因为存在内存浪费。 但 Python 为优化内存使用，选择基于两个数组来实现哈希表，通过避免键值对数组的浪费，来减少内存占用； 键值对数组里的 entry 除了保存 key 和 value 之外，还保存了 key 的哈希值。 以上就是字典的底层实现，但是还没有结束，哈希表的背后还隐藏了很多细节，我们就下一篇文章再聊吧。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 小结","id":"176","title":"小结"},"177":{"body":"通过研究字典的底层实现，我们找到了字典快速且高效的秘密，就是哈希表。而提到哈希表，必然绕不开哈希值，因为它决定了映射之后的索引。 如果想计算对象的哈希值，那么要保证对象必须是可哈希的。如果不可哈希，那么它就无法计算哈希值，自然也就无法作为字典的 key。那什么样的对象是可哈希的呢？ 因为哈希值不能发生改变，所以对象必须是不可变对象； 当对象的哈希值相等时，要判断对象是否相等，所以对象必须实现 __eq__ 方法； 所以如果对象满足不可变、并且实现了 __eq__ 方法，那么它就是可哈希的，只有这样的对象才能作为字典的 key 或者集合的元素。 像整数、浮点数、字符串等内置的不可变对象都是可哈希的，可以作为字典的 key。而像列表、字典等可变对象则不是可哈希的，它们不可以作为字典的 key。然后关于元组需要单独说明，如果元组里面的元素都是可哈希的，那么该元组也是可哈希的，反之则不是。 # 键是可哈希的就行，值是否可哈希则没有要求\nd = {1: 1, \"xxx\": [1, 2, 3], 3.14: 333} # 列表是可变对象，因此无法哈希\ntry: d = {[]: 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" # 元组也是可哈希的\nd = {(1, 2, 3): 123} # 但如果元组里面包含了不可哈希的对象\n# 那么整体也会变成不可哈希对象\ntry: d = {(1, 2, 3, []): 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" 而我们自定义类的实例对象也是可哈希的，并且哈希值是通过对象的地址计算得到的。 class Some: pass s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n8744065697364 8744065697355\n\"\"\" 当然 Python 也支持我们重写哈希函数，比如： class Some: def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n123 123\n\"\"\"\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x0000029C0ED045E0>: 1, <__main__.Some object at 0x0000029C5E116F20>: 2}\n\"\"\" 因为哈希值一样，映射出来的索引自然也是相同的，所以在作为字典的 key 时，会发生冲突。由于类的实例对象之间默认不相等，因此会改变规则重新映射，找一个可以写入的位置。 如果两个对象相等，它们的哈希值一定也相等。 注意：我们自定义类的实例对象默认都是可哈希的，但如果类里面重写了 __eq__，并且没有重写 __hash__ 的话，那么这个类的实例对象就不可哈希了。 class Some: def __eq__(self, other): return True try: hash(Some())\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'Some' \"\"\" 为什么会有这种现象呢？首先上面说了，在没有重写 __hash__ 方法的时候，哈希值默认是根据对象的地址计算得到的。而且对象如果相等，那么哈希值一定是一样的，并且不可变。 但我们重写了 __eq__，相当于控制了 == 操作符的比较结果，两个对象是否相等就由我们来控制了，可哈希值却还是根据地址计算得到的。因为两个对象地址不同，所以哈希值不同，但是对象却可以相等、又可以不相等，这就导致了矛盾。所以在重写了 __eq__、但是没有重写 __hash__ 的情况下，其实例对象便不可哈希了。 但如果重写了 __hash__，那么哈希值就不再通过地址计算了，因此此时是可以哈希的。 class Some: def __eq__(self, other): return True def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x00000202D7D945E0>: 2}\n\"\"\" 我们看到字典里面只有一个元素，因为重写了 __hash__ 方法之后，计算得到的哈希值都是一样的。如果没有重写 __eq__，实例对象之间默认是不相等的，因此哈希值一样，但是对象不相等，那么会重新映射。但我们重写了 __eq__，返回的结果是 True，所以 Python 认为对象是相等的，那么由于 key 的不重复性，只会保留一个键值对。 但需要注意的是，在比较相等时，会先比较地址是否一样，如果地址一样，那么哈希表会直接认为相等。 class Some: def __eq__(self, other): return False def __hash__(self): return 123 def __repr__(self): return \"Some Instance\" s1 = Some()\n# 我们看到 s1 == s1 为 False\nprint(s1 == s1)\n\"\"\"\nFalse\n\"\"\"\n# 但是只保留了一个 key，咦，两个 key 不相等，难道不应该重新映射吗？\n# 原因就是刚才说的，在比较是否相等之前，会先判断地址是否一样\n# 如果地址一样，那么认为是同一个 key，直接判定相等\nprint({s1: 1, s1: 2})\n\"\"\"\n{Some Instance: 2}\n\"\"\" s2 = Some()\n# 此时会保留两个 key，因为 s1 和 s2 地址不同，s1 == s2 也为 False\n# 所以哈希表认为这是两个不同的 key\n# 但由于哈希值一样，那么映射出来的索引也一样\n# 因此写入 s2: 2 时相当于发生了索引冲突，于是会重新映射\n# 但总之这两个 key 都会被保留\nprint({s1: 1, s2: 2}) \"\"\"\n{Some Instance: 1, Some Instance: 2}\n\"\"\" 同样的，我们再来看一个 Python 字典的例子。 d = {1: 123} d[1.0] = 234\nprint(d) # {1: 234} d[True] = 345\nprint(d) # {1: 345} 天哪噜，这是咋回事？首先整数在计算哈希值的时候，得到的结果就是其本身；而浮点数显然不是，但如果浮点数的小数点后面是 0，那么它和整数是等价的。 因此 1 和 1.0 的哈希值一样，并且两者也是相等的，因此它们被视为同一个 key，所以相当于是更新。同理 True 也一样，因为 bool 继承自 int，所以它等价于 1，比如：9 + True = 10。因此 True 和 1 相等，并且哈希值也相等，那么索引 d[True] = 345 同样相当于更新。 但是问题来了，值更新了我们可以理解，字典里面只有一个元素也可以理解，可为什么 key 一直是 1 呢？理论上最终结果应该是 True 才对啊。其实这算是 Python 偷了个懒吧（开个玩笑），因为 key 的哈希值是一样的，并且也相等，所以只会更新 value，而不会修改 key。 为了加深理解，我们再举个例子： d = {\"高老师\": 666} class A: def __hash__(self): return hash(\"高老师\") def __eq__(self, other): return True # A() == \"高老师\" 为 True，两者哈希值也一样\n# 所以相当于对 key 进行更新\nd[A()] = 777\nprint(d) # {'高老师': 777} print(d[\"高老师\"]) # 777\nprint(d[A()]) # 777 只要两个对象相等，并且哈希值相等，那么对于哈希表来说，它们就是同一个 key。 另外我们反复在提哈希值，而哈希值是通过哈希函数运算得到的，一个理想的哈希函数要保证哈希值尽量均匀地分布于整个哈希空间中，越是相近的值，其哈希值差别应该越大。还是那句话，哈希函数对哈希表的好坏起着至关重要的作用。 以上我们就详细地聊了聊对象的哈希值，如果对象可以计算哈希值，那么它一定实现了 __hash__ 方法，而内置的不可变对象都实现了。另外内置的哈希函数 hash，本质上也是调用了 __hash__。 print(hash(\"hello\"))\nprint(\"hello\".__hash__())\n\"\"\"\n-7465190714692855315\n-7465190714692855315\n\"\"\" 下一篇文章来聊一聊索引冲突是怎么解决的？ 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"41. 什么是可哈希对象，它的哈希值是怎么计算的？","id":"177","title":"41. 什么是可哈希对象，它的哈希值是怎么计算的？"},"178":{"body":"两个对象的哈希值相等，那么映射出的索引肯定相同。而如果哈希值不相等，映射出的索引也有可能相同，因为与哈希值空间相比，哈希表的槽位是非常有限的。如果不同的对象在经过映射之后，生成的索引相同，或者说它们被映射到了同一个槽，那么便发生了索引冲突。 解决索引冲突的常用方法有两种：分离链接法和开放寻址法。 分离链接法比较简单，如果有多个键值对映射到同一槽位，那么就用链表将它们串起来。然后是开放寻址法，这也是 Python 使用的方法，我们详细介绍一下。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 楔子","id":"178","title":"楔子"},"179":{"body":"首先将 key 映射成索引，但如果发现该索引对应的哈希槽被占了，那么就尝试另一个。 new_key 被映射到了索引为 5 的槽，但是该槽已经存储了键值对数组的索引，即该槽被占了。如果是分离链接法，那么会使用链表将两个 entry 串起来，但开放寻址法则是选择一个新的槽，也就是重新找个坑。 那么问题来了，新的槽要怎么找呢？一般来说，会在首槽的基础上增加一个偏移量，得到新的槽，如果还冲突，那么继续增加偏移量，直到找到一个可用的槽。总的来说就是一个不断探测的过程，每一次探测都会尝试增加偏移量。 所以新的问题又产生了，每次增加的偏移量是多少呢？其实这个问题取决于具体实现，如果偏移量是线性增加的，我们称之为线性探测；如果偏移量是平方增加的，我们称之为平方探测。 但不管是线性探测，还是平方探测，其实都不够好。因为偏移量始终是以一种固定的模式增加，这就导致映射到同一槽位的两个 key 的探测序列是相同的。 比如这里的 key1 和 key2，它们的哈希值不同，但都映射到了索引为 2 的槽，这是完全正常的，因为哈希表的槽位有限。而由于偏移量的增加方式是固定的，比如这里每次都增加 2，再加上首槽相同，因此它们的探测序列也相同，显然这会导致后续出现多次冲突。 所以 Python 对此进行了优化，探测函数在发现索引冲突时，不会简单地增加一个偏移量，而是会参考对象的哈希值，计算下一个候选位置，这就大大降低了冲突的可能性。 Python 的这种做法被称为迭代探测，当然迭代探测也属于开放寻址法的一种。所以当出现索引冲突时，Python 并不是简简单单地加上一个偏移量，而是使用专门设计的探测函数进行二次探查，也就是之前说的改变规则、重新映射，然后在函数内部会参考对象的哈希值来计算出一个新的索引。 在 dictobject.c 文件开头有着大量的注释，对字典进行了全局性的概括，当然具体细节我们都会详细说明。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 开放寻址法","id":"179","title":"开放寻址法"},"18":{"body":"PyObject 的 ob_type 字段的类型是 PyTypeObject *，所以类型对象由 PyTypeObject 结构体负责实现，看一看它长什么样子。 // Include/cpython/object.h typedef struct _typeobject { PyObject_VAR_HEAD const char *tp_name; Py_ssize_t tp_basicsize, tp_itemsize; destructor tp_dealloc; Py_ssize_t tp_vectorcall_offset; getattrfunc tp_getattr; setattrfunc tp_setattr; PyAsyncMethods *tp_as_async; reprfunc tp_repr; PyNumberMethods *tp_as_number; PySequenceMethods *tp_as_sequence; PyMappingMethods *tp_as_mapping; hashfunc tp_hash; ternaryfunc tp_call; reprfunc tp_str; getattrofunc tp_getattro; setattrofunc tp_setattro; PyBufferProcs *tp_as_buffer; unsigned long tp_flags; const char *tp_doc; traverseproc tp_traverse; inquiry tp_clear; richcmpfunc tp_richcompare; Py_ssize_t tp_weaklistoffset; getiterfunc tp_iter; iternextfunc tp_iternext; struct PyMethodDef *tp_methods; struct PyMemberDef *tp_members; struct PyGetSetDef *tp_getset; struct _typeobject *tp_base; PyObject *tp_dict; descrgetfunc tp_descr_get; descrsetfunc tp_descr_set; Py_ssize_t tp_dictoffset; initproc tp_init; allocfunc tp_alloc; newfunc tp_new; freefunc tp_free; inquiry tp_is_gc; PyObject *tp_bases; PyObject *tp_mro; PyObject *tp_cache; PyObject *tp_subclasses; PyObject *tp_weaklist; destructor tp_del; unsigned int tp_version_tag; destructor tp_finalize; vectorcallfunc tp_vectorcall; Py_DEPRECATED(3.8) int (*tp_print)(PyObject *, FILE *, int); #ifdef COUNT_ALLOCS Py_ssize_t tp_allocs; Py_ssize_t tp_frees; Py_ssize_t tp_maxalloc; struct _typeobject *tp_prev; struct _typeobject *tp_next;\n#endif\n} PyTypeObject; 类型对象在底层对应的是 struct _typeobject，或者说 PyTypeObject，它保存了实例对象的元信息。 所以不难发现，无论是 int、str、dict 等内置类型，还是使用 class 关键字自定义的类型，它们在 C 的层面都是由 PyTypeObject 这个结构体实例化得到的，只不过内部字段的值不同，PyTypeObject 结构体在实例化之后得到的类型对象也不同。 然后我们来看看 PyTypeObject 里面的字段都代表啥含义，字段还是比较多的，我们逐一介绍。 PyObject_VAR_HEAD 宏，会被替换为 PyVarObject，所以类型对象是一个变长对象。因此类型对象也有引用计数和类型，这与我们前面分析的是一致的。 tp_name 对应 Python 中类型对象的 __name__ 属性，即类型对象的名称。 # 类型对象在底层对应的是 PyTypeObject 结构体实例\n# 它的 tp_name 字段表示类型对象的名称\nprint(int.__name__) # int\n# 动态创建一个类\nA = type(\"我是 A\", (object,), {})\nprint(A.__name__) # 我是 A 所以任何一个类型对象都有 __name__ 属性，也就是都有名称。 tp_basicsize，tp_itemsize tp_basicsize：表示创建实例对象所需的基本内存大小； tp_itemsize：如果对象是变长对象，并且元素保存在对应的结构体内部，比如元组，那么 tp_itemsize 表示内部每个元素的内存大小。如果是定长对象，或者虽然是变长对象，但结构体本身不保存数据，而是只保存了一个指针，那么 tp_itemsize 为 0； tp_dealloc 析构函数，对应 Python 中类型对象的 __del__，会在实例对象被销毁时执行。 tp_vectorcall_offset 如果想调用一个对象，那么它的类型对象要定义 __call__ 函数。 class A: def __call__(self, *args, **kwargs): return \"被调用了\" a = A()\n# 如果调用 a，那么 type(a) 要定义 __call__ 函数\nprint(a())\n\"\"\"\n被调用了\n\"\"\"\n# 底层会转成如下逻辑\nprint(A.__call__(a))\n\"\"\"\n被调用了\n\"\"\" # 函数也是一个实例对象，它能被调用\n# 说明 type(函数) 也一定实现了 __call__\ndef some_func(name, age): return f\"name: {name}, age: {age}\"\n# 函数的类型是 function\nprint(type(some_func))\n\"\"\"\n<class 'function'>\n\"\"\"\n# 调用函数\nprint(some_func(\"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\"\n# 也可以这么做\nprint(type(some_func).__call__(some_func, \"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\" 以上就是对象最通用的调用逻辑，但通用也意味着平庸，这种调用方式的性能是不高的。自定义类的实例对象还好，因为需要支持调用的场景不多，而函数则不同，尽管它也是实例对象，但它生下来就是要被调用的。如果函数调用也走通用逻辑的话，那么效率不高，因此 Python 从 3.8 开始引入了 vectorcall 协议，即矢量调用协议，用于优化和加速函数调用。相比常规调用，矢量调用具备如下优势： 避免创建临时元组来传递参数 减少参数打包/解包的开销 支持关键字参数的快速处理 总之当一个对象被调用时，如果它支持 vectorcall 协议，那么会通过 tp_vectorcall_offset 找到实现矢量调用的函数指针。 注意：vectorcall 函数指针定义在实例对象中，而 tp_vectorcall_offset 字段维护了 vectorcall 函数指针在实例对象中的偏移量，该偏移量用于定位到一个特定的函数指针，这个函数指针符合 vectorcall 协议。 如果类型对象的 tp_vectorcall_offset 为 0，表示其实例对象不支持矢量调用，因此会退化为常规调用，即通过类型对象的 __call__ 进行调用。 tp_getattr，tp_setattr 对应 Python 中类型对象的 __getattr__ 和 __setattr__，用于操作实例对象的属性。但这两个字段已经不推荐使用了，因为它要求在操作属性时，属性名必须为 C 字符串，以及不支持通过描述符协议处理属性。 所以这两个字段主要用于兼容旧版本，现在应该使用 tp_getattro 和 tp_setattro。 tp_as_number、tp_as_sequence、tp_as_mapping、tp_as_async tp_as_number：实例对象为数值时，所支持的操作。这是一个结构体指针，指向的结构体中的每一个字段都是一个函数指针，指向的函数就是对象可以执行的操作，比如四则运算、左移、右移、取模等等。 tp_as_sequence：实例对象为序列时，所支持的操作，也是一个结构体指针。 tp_as_mapping：实例对象为映射时，所支持的操作，也是一个结构体指针。 tp_as_async：实例对象为协程时，所支持的操作，也是一个结构体指针。 tp_repr、tp_str 对应 Python 中类型对象的 __repr__ 和 __str__，用于控制实例对象的打印输出。 tp_hash 对应 Python 中类型对象的 __hash__，用于定义实例对象的哈希值。 tp_call 对应 Python 中类型对象的 __call__，用于控制实例对象的调用行为。当然这属于常规调用，而对象不仅可以支持常规调用，还可以支持上面提到的矢量调用（通过减少参数传递的开销，提升调用性能）。 但要注意的是，不管使用哪种调用协议，对象调用的行为必须都是相同的。因此一个对象如果支持矢量调用，那么它也必须支持常规调用，换句话说对象如果实现了 vectorcall，那么它的类型对象也必须实现 tp_call。 如果你在实现 vectorcall 之后发现它比 tp_call 还慢，那么你就不应该实现 vectorcall，因为实现 vectorcall 是有条件的，当条件不满足时性能反而会变差。 tp_getattro，tp_setattro 对应 Python 中类型对象的 __getattr__ 和 __setattr__。 tp_as_buffer 指向 PyBufferProcs 类型的结构体，用于共享内存。通过暴露出一个缓冲区，可以和其它对象共享同一份数据，因此当类型对象实现了 tp_as_buffer，我们也说其实例对象实现了缓冲区协议，举个例子。 import numpy as np buf = bytearray(b\"abc\")\n# 和 buf 共享内存\narr = np.frombuffer(buf, dtype=\"uint8\")\nprint(arr) # [97 98 99]\n# 修改 buf\nbuf[0] = 255\n# 会发现 arr 也改变了，因为它和 buf 共用一块内存\nprint(arr) # [255 98 99] 所以 tp_as_buffer 主要用于那些自身包含大量数据，且需要允许其它对象直接访问的类型。通过实现缓冲区协议，其它对象可以直接共享数据，而无需事先拷贝，这在处理大型数据或进行高性能计算时非常有用。 关于缓冲区协议，后续还会详细介绍。 tp_flags 对应 Python 中类型对象的 __flags__，负责提供类型对象本身的附加信息，通过和指定的一系列标志位进行按位与运算，即可判断该类型是否具有某个特征。 那么标志位都有哪些呢？我们介绍几个常见的。 // Include/object.h // 类型对象的内存是否是动态分配的\n// 像内置的类型对象属于静态类，它们不是动态分配的\n#define Py_TPFLAGS_HEAPTYPE (1UL << 9)\n// 类型对象是否允许被继承\n#define Py_TPFLAGS_BASETYPE (1UL << 10)\n// 类型对象的实例对象是否参与垃圾回收\n#define Py_TPFLAGS_HAVE_GC (1UL << 14)\n// 类型对象是否是抽象基类\n#define Py_TPFLAGS_IS_ABSTRACT (1UL << 20) 我们通过 Python 来演示一下。 # 是否是自定义的动态类\nPy_TPFLAGS_HEAPTYPE = 1 << 9\nclass A: pass\n# 如果与运算的结果为真，则表示是动态类，否则不是\nprint(A.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n512\n\"\"\"\nprint(int.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n0\n\"\"\" # 类型对象是否允许被继承\nPy_TPFLAGS_BASETYPE = 1 << 10\n# object 显然允许被继承，因此与运算的结果为真\nprint(object.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n1024\n\"\"\"\n# 但 memoryview 就不允许被继承\ntry: class B(memoryview): pass\nexcept TypeError as e: print(e) \"\"\" type 'memoryview' is not an acceptable base type \"\"\"\nprint(memoryview.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n0\n\"\"\" # 类型对象的实例对象是否参与垃圾回收\nPy_TPFLAGS_HAVE_GC = 1 << 14\n# int 的实例对象（整数）不会产生循环引用，所以不会参与垃圾回收\nprint(int.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n0\n\"\"\"\n# 但列表是会参与垃圾回收的\nprint(list.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n16384\n\"\"\" # 类型对象是否是抽象基类\nPy_TPFLAGS_IS_ABSTRACT = 1 << 20\nfrom abc import ABCMeta, abstractmethod\n# 显然 C 不是抽象基类，而 D 是\nclass C: pass\nclass D(metaclass=ABCMeta): @abstractmethod def foo(self): pass\nprint(C.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n0\n\"\"\"\nprint(D.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n1048576\n\"\"\" 所以这就是 tp_flags 的作用，它负责描述一个类型对象都具有哪些额外特征。 tp_doc 对应 Python 中类型对象的 __doc__。 class People: \"\"\"以前我没得选\"\"\" print(People.__doc__)\n\"\"\"\n以前我没得选\n\"\"\" 这个比较简单。 tp_traverse，tp_clear 这两个字段是一对，负责参与垃圾回收机制。 tp_traverse：用于标记阶段，通过遍历实例对象所引用的其它对象，确定对象之间的引用关系，帮助垃圾回收器识别出所有活跃的对象和出现循环引用的对象。 tp_clear：用于清除阶段，负责减少出现循环引用的对象的引用计数。 tp_richcompare 负责实现对象的比较逻辑，包含 >、>=、<、<=、!=、==。 tp_weaklistoffset 实例对象的弱引用列表在实例对象中的偏移量，如果 tp_weaklistoffset 为 0，则表示实例对象不支持弱引用。 tp_iter、tp_iternext 对应 Python 中类型对象的 __iter__ 和 __next__。 tp_methods 负责保存类型对象里的成员函数，我们以 list 为例。 tp_members 负责指定可以绑定在实例对象上的属性，我们使用 class 关键字定义动态类的时候，会在 __init__ 函数中给实例对象绑定属性，而对于底层 C 来说，需要通过 tp_members 字段。 以 slice 为例，它负责创建一个切片。 lst = list(range(10))\nprint(lst[1: 7: 2]) # [1, 3, 5]\n# 等价于\nprint(lst[slice(1, 7, 2)]) # [1, 3, 5] slice 是一个底层实现好的静态类，接收 start、end、step 三个参数，所以它底层的 tp_members 就是这么定义的。 对于静态类而言，可以给 self 绑定哪些属性、以及类型是什么，都已经事先在 tp_members 里面写死了，后续不可以新增或删除属性。 s = slice(1, 7, 2)\n# 静态类的实例对象不可以新增或删除属性\ntry: s.xx = \"xx\"\nexcept AttributeError as e: print(e) \"\"\" 'slice' object has no attribute 'xx' \"\"\" # 至于能否修改，则看定义属性时是否要求属性是 READONLY\n# 对于 slice 来说，它的三个属性都是 READONLY，所以不能修改\ntry: s.start = 2\nexcept AttributeError as e: print(e) \"\"\" readonly attribute \"\"\" 但使用 class 自定义的动态类而言，新增、删除、修改属性都是可以的，至于里面的更多细节，后续在介绍类的时候会详细剖析。 tp_getset 指向一个 PyGetSetDef 结构体数组，里面的每个结构体都定义了一个属性的名称、获取该属性的函数、设置该属性的函数、属性的文档字符串。 name：属性的名称，Python 代码可以通过该名称来访问属性。 get：属性的 getter 函数，如果设置了这个函数，Python 代码读取属性时会调用它。 set：属性的 setter 函数，如果设置了这个函数，Python 代码修改属性时会调用它。 doc：属性的文档字符串，为属性提供描述信息。 closure：一个 void * 指针，用于传递额外的信息给 getter 和 setter，不常用。 所以我们发现 tp_getset 的作用不就类似于 @property 装饰器吗？tp_getset 数组里面的每个结构体负责实现一个 property 属性。 tp_base 对应 Python 中类型对象的 __base__，返回继承的第一个父类。 tp_dict 对应 Python 中类型对象的 __dict__，即属性字典。 tp_descr_get、tp_descr_set 对应 Python 中类型对象的 __get__ 和 __set__，用于实现描述符。 tp_dictoffset 注意它和 tp_dict 的区别，tp_dict 表示类型对象的属性字典，而 tp_dictoffset 表示实例对象的属性字典在实例对象中的偏移量。 tp_init 对应 Python 中类型对象的 __init__，用于实例对象属性的初始化。 tp_alloc 负责为实例对象申请内存，申请多大呢？取决于 tb_basicsize 和 tp_itemsize。 tp_new 对应 Python 中类型对象的 __new__，即构造函数，在 tp_new 内部会调用 tp_alloc 为实例对象申请内存。 tp_free 内存释放函数，负责释放实例对象所占的内存，注意它和 tp_dealloc 的区别与联系。tp_dealloc 表示析构函数，当对象的引用计数降到零的时候执行，内部会负责如下工作。 减少引用的其它对象的引用计数； 释放对象拥有的资源，比如文件句柄或网络连接； 调用内存释放函数来释放对象本身占用的内存，这一步由 tp_free 来完成。 所以要注意这几个字段之间的区别，我们再总结一下。 tp_is_gc 指示该类型对象的实例对象是否参与垃圾回收。 // Objects/typeobject.c\nunsigned long\nPyType_GetFlags(PyTypeObject *type)\n{ return type->tp_flags;\n} // Include/object.h\n#define PyType_HasFeature(t,f) ((PyType_GetFlags(t) & (f)) != 0) // Include/objimpl.h\n// 显然只需判断 tp_flags & Py_TPFLAGS_HAVE_GC 是否不等于 0 即可\n#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC) 如果参与垃圾回收，那么 tp_flags & Py_TPFLAGS_HAVE_GC 的结果不等于 0。 tp_bases 对应 Python 中类型对象的 __bases__，返回一个元组，里面包含直接继承的所有父类。 tp_mro 对应 Python 中类型对象的 __mro__，返回一个元组，里面包含自身以及直接继承和间接继承的所有父类，直到 object。 注意：返回的元组中的类是有顺序关系的，它基于 C3 线性算法生成，定义了方法解析的顺序。当 Python 需要查找方法或属性时，将按照此顺序进行搜索。 tp_cache 该字段已废弃，这里不做介绍。 tp_subclasses 等价于 Python 中类型对象的 __subclasses__，会返回继承该类的所有子类。 class A: pass class B(A): pass class C(B): pass print(A.__subclasses__())\n\"\"\"\n[<class '__main__.B'>]\n\"\"\" 但是只返回直接继承的子类，间接继承的不返回，比如这里只返回了 B，而 C 没有返回。 tp_weaklist 类型对象的弱引用列表，注意它和前面提到的 tp_weaklistoffset 的区别。tp_weaklist 表示类型对象的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表在实例对象中的偏移量。 tp_del 和 tp_dealloc 作用相同，但 tp_del 主要是兼容以前的旧版本，现在直接使用 tp_dealloc 即可。 tp_version_tag 用于标记类型对象的版本，每当类型的定义发生变化时（例如添加、删除或修改成员函数），版本标签就会更新。解释器会使用这个版本标签来确定方法缓存是否有效，从而避免每次调用方法时都重新解析和查找。 tp_finalize 负责在对象被销毁之前执行相应的清理操作，确保资源得到妥善处理，它的调用时机在对象的引用计数达到零之后、tp_dealloc（析构函数）被调用之前。 该字段不常用，一般只出现在生成器和协程当中。然后 tp_dealloc、tp_del、tp_finalize 三个字段的类型是一致的，都是 destructor 类型，那么它们三者有什么区别呢？ tp_dealloc：在所有的类型对象中都需要指定，因为它是管理实例对象生命周期的关键，它负责减少引用的其它对象的引用计数，以及调用 tp_free 释放当前对象占用的内存，当然也可以执行必要的清理操作。 tp_finalize：负责在对象的生命周期结束前执行相关清理操作，一般只用于生成器和协程当中，此时会和 tp_dealloc 搭配使用。 tp_del：除非是兼容遗留代码，否则应避免使用 tp_del，而是依赖于更现代的垃圾回收和清理机制，即使用 tp_dealloc。 tp_vectorcall 前面说了，实例对象在调用时，可以走类型对象的 tp_call，但这样效率不高。为此 Python 引入了矢量调用，实现矢量调用的函数指针定义在实例对象内部，偏移量则由类型对象的 tp_vectorcall_offset 字段维护。 如果实例对象支持矢量调用，那么会通过类型对象的 tp_vectorcall_offset 定位到对应的 vectorcall 函数指针，进行调用。否则执行类型对象的 tp_call。 那么问题来了，既然实例对象可以支持矢量调用，那么类型对象当然也可以支持。而类型对象的矢量调用函数，便由 tp_vectorcall 字段指定。 所以 tp_vectorcall 和 tp_vectorcall_offset 之间的关系，就类似于 tp_dict 和 tp_dictoffset 之间的关系。 tp_dict 表示类型对象自身的属性字典，tp_dictoffset 表示实例对象的属性字典相对于实例对象首地址的偏移量。 tp_vectorcall 表示类型对象自身的矢量调用函数，tp_vectorcall_offset 表示实例对象的矢量调用函数相对于实例对象首地址的偏移量。 tp_weaklist 表示类型对象自身的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表相对于实例对象首地址的偏移量。 offset 机制允许实例对象拥有更加弹性的内存布局。 另外如果类型对象的 tp_vectorcall 字段为空，则表示类型对象不支持矢量调用，那么它在调用时会走元类的 tp_call。所以我们说 class 具有二象性，而这种平行的设计使得 Python 能够统一处理类型对象和实例对象的属性访问和调用行为。 以上就是 PyTypeObject 的各个字段的含义。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 解密 PyTypeObject","id":"18","title":"解密 PyTypeObject"},"180":{"body":"当存储键值对时，要将 key 映射成索引，这个索引就是哈希索引数组的索引。至于具体的映射过程由探测函数负责，即 PyDictKeysObject 结构体内部的 dk_lookup 字段。 Python 为哈希表搜索提供了多种探测函数： lookdict_unicode：专门针对 key 为字符串的 entry。 lookdict_index：专门针对 key 为整数的 entry。 lookdict：通用逻辑，可以把 lookdict_unicode、lookdict_index 看成 lookdict 的特殊实现，只不过 key 是整数和字符串的场景非常常见，因此为其单独实现了一个函数。 我们这里重点看一下 lookdict 的函数实现，不过在介绍之前，先来看几个宏。 // Objects/dictobject.c // 获取哈希表的长度，或者说哈希索引数组的长度\n#define DK_SIZE(dk) ((dk)->dk_size) // 哈希表的长度减 1，将 key 的哈希值和它按位与，便可将 key 映射成索引\n// 因为 dk_size 满足 2 的 n 次方，所以 hash % dk_size 等价于 hash & (dk_size - 1)\n#define DK_MASK(dk) (((dk)->dk_size)-1) // 获取哈希索引数组中每个元素的大小，数组的长度不同，每个元素的大小不同\n// dk_size <= 255，每个元素 1 字节\n// 256 <= dk_size <= 65535，每个元素 2 字节\n// 65536 <= dk_size <= 4294967295，每个元素 4 字节\n// dk_size >= 4294967296，每个元素 8 字节\n// 由于字典的键值对个数基本不会超过 4294967295，所以我们认为元素的大小就是 1、2 或者 4 字节\n#define DK_IXSIZE(dk) \\ (DK_SIZE(dk) <= 0xff ? \\ 1 : DK_SIZE(dk) <= 0xffff ? \\ 2 : DK_SIZE(dk) <= 0xffffffff ? \\ 4 : sizeof(int64_t)) // 获取紧跟在 PyDictKeysObject 结构体后面的键值对数组\n// 这个和前面介绍字符串时，获取 PyASCIIObject 结构体后面的字符数组是类似的\n// 主要是利用 C 语言指针的技巧（甚至都不能算技巧），这里再来详细介绍一下\n// 假设有一个 int *a，那么 a + 3 和 a[3] 是等价的，都会向后偏移 3 个 int，即 12 字节\n// 那么问题来了，对于任意类型的指针 T *p，如果想向后偏移 n 个字节，该怎么做呢？\n// 很简单，将 p 加上 n / sizeof(T) 即可，但问题是 n / sizeof(T) 不一定是个整数啊\n// 因此我们可以将指针转成 int8_t *，然后再加上 n，这样就会偏移 sizeof(int8_t) * n 个字节，即 n 个字节\n// 比如 ((int8_t *)p) + n 或者 ((int8_t *)p)[n]\n// 然后再来看 DK_ENTRIES 这个宏的逻辑，由于键值对数组紧跟在哈希索引数组后面\n// 所以通过 (dk)->dk_indices 获取哈希索引数组，然后转成 int8_t * 类型\n// 而 DK_SIZE(dk) * DK_IXSIZE(dk) 显然是哈希索引数组所占的内存大小\n// 然后让 (int8_t*)((dk)->dk_indices) 向后偏移这些字节，不就定位到键值对数组的首元素了吗\n#define DK_ENTRIES(dk) \\ ((PyDictKeyEntry*)(&((int8_t*)((dk)->dk_indices))[DK_SIZE(dk) * DK_IXSIZE(dk)])) // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 以上就是常用的几个宏，然后来看探测函数 lookdict 的逻辑。 // Objects/dictobject.c #define PERTURB_SHIFT 5 // 基于哈希索引数组的索引，获取指定的哈希槽里面存储的键值对数组的索引\nstatic inline Py_ssize_t\ndictkeys_get_index(PyDictKeysObject *keys, Py_ssize_t i)\n{ // 哈希表的长度 Py_ssize_t s = DK_SIZE(keys); // 键值对数组的索引 Py_ssize_t ix; // 如果哈希表的长度小于 1 << 8，哈希索引数组的每个元素占 1 字节 if (s <= 0xff) { int8_t *indices = (int8_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度小于 1 << 16，哈希索引数组的每个元素占 2 字节 // 指针类型要转成 int16_t *，这样获取元素时会获取两个字节 else if (s <= 0xffff) { int16_t *indices = (int16_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度大于等于 1 << 32，哈希索引数组的每个元素占 8 字节（no way）\n#if SIZEOF_VOID_P > 4 else if (s > 0xffffffff) { int64_t *indices = (int64_t*)(keys->dk_indices); ix = indices[i]; }\n#endif // 否则哈希索引数组的每个元素占 4 字节 else { int32_t *indices = (int32_t*)(keys->dk_indices); ix = indices[i]; } assert(ix >= DKIX_DUMMY); // 返回键值对数组的索引 return ix;\n} // 探测函数\nstatic Py_ssize_t _Py_HOT_FUNCTION\nlookdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr)\n{ // 将 key 映射成索引，这个索引就是哈希索引数组的索引 /* 参数 mp：指向字典的指针 * 参数 key：指向键的指针 * 参数 hash：键的哈希值 * 参数 value_addr：值的二级指针 */ size_t i, mask, perturb; PyDictKeysObject *dk; PyDictKeyEntry *ep0; top: // 指向 PyDictKeysObject 对象 dk = mp->ma_keys; // 获取 PyDictKeysObject 内部的 dk_entries，即键值对数组 ep0 = DK_ENTRIES(dk); // 哈希表的长度减 1 mask = DK_MASK(dk); // perturb，初始值等于参数 hash，即 key 的哈希值 perturb = hash; // 将哈希值和 mask 按位与，计算出哈希索引数组的索引 i = (size_t)hash & mask; for (;;) { // 基于哈希索引数组的索引，从指定的哈希槽中获取键值对数组的索引 Py_ssize_t ix = dictkeys_get_index(dk, i); // 哈希索引数组里面的元素初始为 -1，如果 ix == -1 // 证明当前 key 映射出的哈希槽，还没有存储键值对数组的某个索引 // 这就意味着当前要查找的 key 不存在，此时直接返回 -1 即可 if (ix == DKIX_EMPTY) { *value_addr = NULL; return ix; } // 如果 ix >= 0，说明确实存储了一个合法的键值对数组的索引 if (ix >= 0) { // ep0 是键值对数组，基于索引 ix 获取里面的键值对 PyDictKeyEntry *ep = &ep0[ix]; assert(ep->me_key != NULL); // ep->me_key 和变量 key 都是指针 // 如果这两者相等，说明指向了同一个对象（字符串），显然查找的 key 已在字典中 if (ep->me_key == key) { // 该函数不光要返回索引，还要返回 value，但 C 是单返回值语言，怎么办呢？ // 只需要在调用函数时传个指针过来即可，会在函数内部进行修改 // 由于 Python 的变量、容器存储的元素本身就是指针，所以 value_addr 是个二级指针 *value_addr = ep->me_value; // 返回键值对数组的索引 return ix; } // 如果 ep->me_key != key，说明两者指向的不是同一个对象 // 那么就比较两个对象本身以及哈希值是否相等，如果相等，也表示 key 已存在 if (ep->me_hash == hash) { // 先保证哈希值相等 PyObject *startkey = ep->me_key; Py_INCREF(startkey); // cmp 大于 0 说明比较结果为真，等于 0 说明比较结果为假，小于 0 说明比较时出现错误 int cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) { *value_addr = NULL; return DKIX_ERROR; } // 可能有人觉得这里的 if 是不是有点多余，这肯定百分百成立啊 // 其实这一步主要是为了检测字典是否被修改（不用关注） if (dk == mp->ma_keys && ep->me_key == startkey) { // 如果 cmp > 0，说明两个对象相等，那么修改 *value_addr，返回 ix if (cmp > 0) { *value_addr = ep->me_value; return ix; } } else { // 字典如果被修改，那么重头来，这里不用关注 goto top; } } } // 走到这里说明 ix 是合法的，但是对应的 entry->me_key 和当前要查找的 key 不相等 // 显然出现了索引冲突，于是将哈希值右移 5 位 perturb >>= PERTURB_SHIFT; // 然后加上 i*5 + 1，并重新和 mask 按位与，得到新的哈希索引数组的索引 // 也就是之前说的，改变规则、重新映射 i = (i*5 + perturb + 1) & mask; } Py_UNREACHABLE();\n} 以上就是 lookdict 函数的逻辑，至于 lookdict_index 和 lookdict_unicode 与之是类似的。 我们将逻辑再描述一遍，首先 perturb 初始等于 key 的哈希值，mask 等于哈希表的长度减一，然后执行 perturb & mask 便可得到一个索引。这个过程就是我们说的索引映射，映射出的索引便是哈希索引数组的索引，然后该索引对应的哈希槽又存储了一个索引，这个索引是键值对数组的索引。 哈希索引数组里面的一个位置我们称之为一个槽，如果映射出来的索引对应的哈希槽中存储的键值对数组的索引小于 0，说明该 key 对应的键值对还没有被存储过，那么直接返回初始值 -1 即可。 如果存储的键值对数组的索引（源码中的 ix）大于等于 0，说明已经存储了一个键值对，它的 key 和查找的 key 映射出的索引是相同的。然后比较 key 是否相等，如果相等，说明已经找到了，那么直接返回 ix 即可。如果 key 不相等，说明出现索引冲突了，那么要改变策略，重新映射。 perturb >>= PERTURB_SHIFT;\ni = mask & (i*5 + perturb + 1); 变量 i 便是映射出的哈希索引数组的索引，但发生冲突了，于是将 perturb 右移 5 位，然后加上 perturb + i * 5 + 1，再和 mask 按位与计算出新的 i。至于为什么要选择这种做法，这是 Python 官方经过多次实践得出来的结论。 当 lookdict 执行完之后，外界就拿到了指定的 key 对应的键值对数组的索引，并且也能拿到 key 对应的 value（key 若不存在就是 NULL）。但是还没结束，我们看到 lookdict 返回的是变量 ix，而变量 i 才是我们需要的。 变量 i 表示槽的索引，变量 ix 表示该槽存储的键值对数组的索引。由于我们是要寻找指定的槽，那么返回的应该是槽的位置、也就是变量 i 才对啊，为啥要返回变量 ix 呢？别急，往下看。 #define DKIX_EMPTY (-1) 初始状态下，槽存储的都是 -1，表示当前槽是可用的。如果存储的索引大于等于 0，则表示该槽已经被占用了，当 key 不相等时会改变规则重新映射。总之最终的结果是： 如果 key 存在，那么返回的 ix 就是该 key 对应的键值对在键值对数组中的索引，此时 ix 大于等于 0； 如果 key 不存在，那么返回的 ix 就是哈希槽的初始值 -1。 所以 lookdict 函数只是告诉我们当前 key 在哈希表中是否存在，如果要获取槽的索引，即 lookdict 里面的变量 i，那么还需要另外两个函数。 find_empty_slot：如果 lookdict 返回的 ix 小于 0，说明 key 不存在，那么调用该函数返回槽的索引。 lookdict_index：如果 lookdict 返回的 ix 大于等于 0，说明 key 存在，那么调用该函数返回槽的索引。 所以这两个函数做的事情是一样的，都是返回槽的索引，我们看一下具体实现。 // Objects/dictobject.c static Py_ssize_t\nfind_empty_slot(PyDictKeysObject *keys, Py_hash_t hash)\n{ assert(keys != NULL); const size_t mask = DK_MASK(keys); // 获取槽的索引 i size_t i = hash & mask; // 获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(keys, i); // 不停映射，直到 ix 小于 0 // 因为调用该函数时已经说明 key 不存在了 // 所以最终一定会映射到一个空槽 for (size_t perturb = hash; ix >= 0;) { perturb >>= PERTURB_SHIFT; // 映射的逻辑是相同的 i = (i*5 + perturb + 1) & mask; ix = dictkeys_get_index(keys, i); } // 当 ix 小于 0 时，便找到了槽的索引 return i;\n} static Py_ssize_t\nlookdict_index(PyDictKeysObject *k, Py_hash_t hash, Py_ssize_t index)\n{ size_t mask = DK_MASK(k); size_t perturb = (size_t)hash; size_t i = (size_t)hash & mask; for (;;) { // 基于槽的索引 i，获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(k, i); // 参数 index 就是 lookdict 函数返回的 ix // 如果 ix 和 index 是相等的，说明此时的 i 就是要获取的槽的索引 if (ix == index) { return i; } if (ix == DKIX_EMPTY) { return DKIX_EMPTY; } // 整个映射逻辑都是一样的 // 因为在 lookdict 函数中只返回了 ix，即参数 index // 所以要按照相同的规则再映射一次，如果映射出的 ix 和 index 相等 // 那么我们就找到了槽的索引 i，并且索引为 i 的槽存储的就是 index perturb >>= PERTURB_SHIFT; i = mask & (i*5 + perturb + 1); } Py_UNREACHABLE();\n} 所以我们说的探测函数应该是 lookdict 和 find_empty_slot、lookdict_index 的组合。 lookdict 负责返回槽存储的索引，用于判断 key 是否存在。 find_empty_slot、lookdict_index 则负责返回槽的索引，即 key 最终被映射到了哪一个槽。 另外还有一点，我们之前说索引冲突时，会执行探测函数计算新的存储位置。其实不管有没有发生冲突，即使存储键值对的时候哈希表是空的，也要执行探测函数，毕竟探测函数的目的就是基于哈希值映射出一个合适的槽。如果探测函数执行的时候发现索引冲突了，也就是槽里的索引 ix >= 0，并且 key 还不相等，那么会改变规则重新映射。 因此在存储某个键值对时，无论索引冲突多少次，探测函数只会执行一次。在探测函数里面，会不断尝试解决冲突，直到映射出一个可用的槽。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 探测函数","id":"180","title":"探测函数"},"181":{"body":"以上就是索引映射的具体逻辑，以及出现冲突是怎么解决的。就是先用哈希函数计算出 key 的哈希值，然后作为参数传递到探测函数中。在探测函数里面，会将哈希值和 mask 按位与，得到索引。如果索引冲突了，那么会改变规则，这里的规则如下： // 将哈希值右移 PERTURB_SHIFT 个位\nperturb >>= PERTURB_SHIFT;\n// 然后将哈希值加上 i*5 + 1，这个 i 就是当前冲突的索引\n// 运算之后的结果再和 mask 按位与，得到一个新的 i\n// 然后判断变量 i 对应的槽是否可用，不可用则重复当前逻辑，直到出现一个可用的槽\ni = (i*5 + perturb + 1) & mask; 所以 Python 在索引冲突时，并不像线性探测和平方探测那样，简单地加一个固定的偏移量，而是参考对象的哈希值计算出一个新的索引。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 小结","id":"181","title":"小结"},"182":{"body":"通过前面的学习，我们知道哈希表这种数据结构的逻辑是先通过哈希函数计算出键（key）的哈希值，然后将哈希值传递到探测函数中，映射成一个索引，最终通过索引去访问连续的内存区域。而哈希表这种数据结构，最终目的就是加速键的搜索过程。 但索引会存在冲突，并且键值对数量越多，映射出的索引出现冲突的概率越高。而如果冲突了，就改变规则重新映射，这种做法叫做开放寻址法。当发生冲突时，在探测函数内部会参考哈希值以及冲突的索引，计算下一个候选位置，并判断是否可用。如果不可用，会继续重复此过程，直到找到一个可用的位置。 通过多次探测，会经过多个位置，我们认为这些位置就形成了一个冲突探测链（探测序列），下面举例说明。 为了描述方便，我们后续偶尔会用 dk_indices 表示哈希索引数组、用 dk_entries 表示键值对数组、用 entry 表示键值对（包含两个字段：me_key 和 me_value，分别表示键和值）。当然在源码中，它们也是这个名字。 key 映射之后的索引是哈希索引数组的索引，我们记作 i，该索引对应的哈希槽中又存储了一个索引（entry 在键值对数组中的索引），我们记作 ix。那么 ix = dk_indices[i]，对应的 entry = dk_entries[ix]。 比如插入一个 key 等于 \"satori\" 的键值对，它映射到了索引为 a 的槽，但是该槽已经被占用了，那么 dk_entries[dk_indices[a]] 便是使用该槽的 entry，但它的 key 不等于 \"satori\"，说明出现了索引冲突。于是重新映射，映射到索引为 b 的槽，发现依旧不行。那么只能再次映射，映射到索引为 c 的槽，发现该槽存储的索引是 -1，说明该槽还没有人用，于是将键值对追加到 dk_entries 中，并把它在 dk_entries 中的索引存在该槽中。 那么经过以上流程，a -> b -> c 便形成了一条冲突探测链，同理我们查找的时候也会按照这个顺序进行查找。 显然上面这些东西，现在理解起来已经没什么难度了，我们基于 key 获取 value 时也是这个过程。 当执行 d[\"satori\"] 时，肯定会先映射到索引为 a 的槽，但 dk_entries[dk_indices[a]].me_key 不等于字符串 \"satori\"，于是重新映射。然后映射到索引为 b 的槽，发现还不相等，再映射到索引为 c 的槽，发现对应的键值对的 key 等于 \"satori\"，于是就把值取出来了。 显然以上符合我们的预期，但是，我要说但是了。如果我们把索引为 b 的槽对应的 entry 删掉呢？那么老规矩，映射成索引，先走到索引为 a 的槽，但是发现坑被占，于是又走到索引为 b 的槽，结果发现居然没有 entry，那么直接就报出了一个 KeyError。 所以继续寻找的前提是，哈希槽一定存储了某个 entry 在键值对数组中的索引，并且该 entry 的 key 和指定的 key 不相等。但如果发现没有 entry，直接 KeyError。 然而 \"satori\" 这个 key 确实是存在的，因此这种情况我们称之为探测链断裂。本来应该走到位置 c 的，但是由于位置 b 没有对应 entry，导致探测函数在位置 b 就停止了。 因此我们发现，当一个 entry 只要位于任何一条探测链当中，在删除时都不能执行真正意义上的删除，而是要进行伪删除。那什么是伪删除呢？别着急，先往下看。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表能直接删除元素吗","id":"182","title":"哈希表能直接删除元素吗"},"183":{"body":"哈希槽有以下几种状态： Unused； Active； Dummy； 来解释一下它们的含义。 // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 上面几个宏非常重要，当然主要是前两个宏。 Unused 态 如果没有 key 映射到指定的哈希槽，那么该哈希槽存储的索引就是 -1，即 DKIX_EMPTY，表示该槽尚未被使用，那么状态便是 Unused 态。比如一个刚初始化的哈希表，它的哈希索引数组存储的便都是 -1。 Active 态 如果某个 key 映射到了指定的哈希槽，那么该槽便会存储对应 entry 在键值对数组中的索引，这个索引一定是大于等于 0 的，此时该槽就从 Unused 态变成了 Active 态。 后续如果又有 key 映射到了该槽，那么看它和已存在的 entry 的 key，即 entry->me_key 是否相等。如果不相等，那么要改变规则重新映射；如果相等，那么便找到了指定的 entry，此时便可以更新或返回 entry->me_value。 Dummy 态 假设 key=\"abc\" 映射到了索引为 i 的哈希槽，该槽存储了对应的 entry 在键值对数组中的索引 ix，这时如果将 key=\"abc\" 的键值对给删掉，那么索引为 i 的哈希槽存储的值会变成多少呢？ 可能有人觉得，键值对都删掉了，那么哈希槽也不用再存储它的索引了，应该会重置为 -1 吧。答案是不对的，原因就是我们刚才说的，这么做会导致探测链断裂。 当 entry 被删掉之后，哈希槽存储的值会变成 -2，即 DKIX_DUMMY，表示该槽之前存储过某个 entry 在键值对数组中的索引，但是该 entry 被删除了。注：删除 entry 也不是直接将它从键值对数组中删掉，而是将它的 me_key 和 me_value 字段设置为 NULL。 图中的 dk_indices 中有一个槽存储的是 -2，但很明显之前它存储的应该是 1，只是后续 dk_entries 中索引为 1 的 entry 被删除了。而删除一个 entry，会将它的 me_key 和 me_value 设置为 NULL，并将哈希槽存储的索引设置为 -2，这便是上面提到的伪删除技术。 所以一个哈希槽有三种状态，我们记哈希槽存储的索引为 ix。 1）如果 ix == -1，说明该槽处于 Unused 态，还没有存储任何一个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，那么会 KeyError。 2）如果 ix >= 0，说明该槽处于 Active 态，已经保存了某个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要添加的 entry 的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么直接更新 value。 当基于 key 获取 value 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要搜索的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么返回 entry 的 value。 3）如果 ix == -2，说明该槽处于 Dummy 态，之前存储了某个 entry 在键值对数组中的索引，但之后该 entry 被删除了。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，发现处于 Dummy 态，会明白虽然当前的槽是无效的，但它不是探测链的终点，所以不会报错，而是会继续搜索，这样就保证了探测链的连续性。至于报错，是发现映射出的哈希槽处于 Unused 态，没有存储任何一个 entry 的索引，这就说明 key 对应的 entry 不存在，此时才会 KeyError。 以上就是哈希槽的三种状态，它们之间可以进行转换，但 Unused 态只能转换为 Active 态；Active 态只能转换为 Dummy 态；Dummy 态只能转换为 Active 态。 如果哈希槽存储的 ix == DKIX_EMPTY，那么它处于 Unused 态。如果后续存储了 entry 在键值对数组中的索引，那么 ix >= 0，此时哈希槽会从 Unused 态转换为 Active 态。如果哈希槽存储的索引对应的 entry 被删除，那么 ix 会变成 DKIX_DUMMY，此时哈希槽会从 Active 态转换为 Dummy 态。 那么问题来了，Dummy 态转换为 Active 态，你能猜到会在什么时候发生吗？ 很容易想到，假设新来了一个 entry，它正好撞上了 Dummy 态的哈希槽，那么该槽会从 Dummy 态转为 Active 态。 总结：假设新增一个 entry，它的 key 映射到了索引为 i 的槽，该槽存储的索引为 ix。 如果 ix == -1，说明一上来就有位置可用，那么直接将 entry 追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。也就是说，Python 默认不关心是否有 Dummy 态的哈希槽。 如果 ix >= 0，说明该槽已经有人用了，那么比较 dk_entries[ix].me_key 和要插入的 entry 的 key 是否相等，如果相等，那么更新键值对，不相等则重新映射。 如果 ix == -2，说明该槽之前被使用了，但使用它的 entry 后续又被删除了（伪删除，内存还在）。此时会复用该哈希槽，不过被伪删除的旧 entry 不会被复用，新增的 entry 依旧会追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。 还是这张图，但做了一些修改。图中索引为 5 的哈希槽存储的索引 ix 等于 4，但它经历了以下几个过程。 dk_indices[5] 初始为 -1，即 DKIX_EMPTY，此时处于 Unused 态。 来了一个 entry，映射到了索引为 5 的槽，发现该槽可用，于是将 dk_indices[5] 修改为 1（它在 dk_entries 中的索引），此时哈希槽变成 Active 态。 映射到索引为 5 的哈希槽的 entry 被删除，于是将 dk_indices[5] 修改为 DKIX_DUMMY，即 -2，并将 dk_entries[1] 的 me_key 和 me_value 设置为 NULL，此时哈希槽变成 Dummy 态。 后续又来了一个 entry，也映射到了索引为 5 的哈希槽，发现 dk_indices[5] 等于 -2，处于 Dummy 态。于是将新的 entry 追加到 dk_entries 中，并且在 dk_entries 中的索引为 4，然后再将 dk_indices[5] 修改为 4，此时哈希槽再次变成 Active 态。 那么问题来了，被删除的旧 entry 怎么办？显然会留在那里，它是无法被复用的，当它被删除的那一刻，就和哈希索引数组失去了联系，因为对应的哈希槽存储的值被修改成了 -2。即使后续有新的 entry 映射到了同一个槽，它也不知道该槽在存储 -2 之前存储了什么，所以只能选择追加。 而那些被删除的旧 entry 会在哈希表执行扩缩容的时候被处理，比如哈希表满了，会申请新的存储单元，然后将处于 Active 态的哈希槽对应的 entry 搬过去，其它的则直接丢弃。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希槽的几种状态","id":"183","title":"哈希槽的几种状态"},"184":{"body":"下面我们通过源码，来感受一下字典（哈希表）是如何删除元素的。字典有一个 pop 方法，可以基于 key 弹出指定的 entry，我们就来看一下它的源码实现。 // Objects/dictobject.c\n#define DICT_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))dict_pop, METH_FASTCALL, dict_pop__doc__}, static PyObject *\ndict_pop(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // pop 方法的返回值 PyObject *return_value = NULL; // 指定的 key PyObject *key; // pop 方法支持传入一个默认值 // 当 key 不存在时，如果不指定默认值，pop 方法会报错，否则会返回默认值 PyObject *default_value = NULL; // args 是由参数组成的元组，nargs 表示参数的个数 // 显然参数的个数必须是 1 ~ 2 个 if (!_PyArg_CheckPositional(\"pop\", nargs, 1, 2)) { goto exit; } // args[0] 表示 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示默认值，如果指定了的话 default_value = args[1];\nskip_optional: // 调用 dict_pop_impl 函数 // 从字典中弹出具有指定 key 的 entry，并返回它的 value return_value = _PyDict_Pop((PyObject*)self, key, default_value); exit: return return_value;\n} 具体的逻辑由 _PyDict_Pop 承载，看看它长什么样子？ // Objects/dictobject.c\nPyObject *\n_PyDict_Pop(PyObject *dict, PyObject *key, PyObject *deflt)\n{ Py_hash_t hash; // 快分支，如果键值对的个数为 0 if (((PyDictObject *)dict)->ma_used == 0) { // 那么当指定默认值时，直接返回默认值 if (deflt) { Py_INCREF(deflt); return deflt; } // 否则抛出 KeyError _PyErr_SetKeyError(key); return NULL; } // 计算 key 的哈希值，这里分两种情况 // key 不是字符串，那么调用 PyObject_Hash 函数进行计算 // key 是字符串，那么直接获取，如果获取的结果为 -1（之前没有计算过），也要重新计算 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { // 如果计算的结果是 -1，说明 key 无法被哈希 hash = PyObject_Hash(key); if (hash == -1) return NULL; } return _PyDict_Pop_KnownHash(dict, key, hash, deflt);\n} PyObject *\n_PyDict_Pop_KnownHash(PyObject *dict, PyObject *key, Py_hash_t hash, PyObject *deflt)\n{ Py_ssize_t ix, hashpos; PyObject *old_value, *old_key; PyDictKeyEntry *ep; PyDictObject *mp; assert(PyDict_Check(dict)); mp = (PyDictObject *)dict; // 如果字典为空，即键值对个数为 0 // 那么当指定默认值时，直接返回默认值，否则抛出 KeyError if (mp->ma_used == 0) { if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // mp->ma_keys->dk_lookup 表示探测函数，负责将 key 映射成索引，找到对应的哈希槽 // 然后返回哈希槽存储的 entry 在 dk_entries 中的索引 // 并且在探测函数里面，还会对 old_value 进行修改 ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); if (ix == DKIX_ERROR) return NULL; // 如果 ix == -1，说明映射之后的哈希槽处于 Unused 态 // 说明该 key 对应的 entry 不存在，或者说 key 不存在 if (ix == DKIX_EMPTY || old_value == NULL) { // 如果指定了默认值，返回默认值，否则抛出 KeyError if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // 到这里说明 ix >= 0，即 key 在字典中存在 // 然后检测字典是否是分离表，由于分离表不允许删除 key，所以要重构为结合表 // 分离表就是为了节省内存引入的，因此它的限制较多，这里不做过多讨论 if (_PyDict_HasSplitTable(mp)) { if (dictresize(mp, DK_SIZE(mp->ma_keys))) { return NULL; } ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); assert(ix >= 0); } // 这个函数之前也见过，它负责基于哈希槽存储的 entry 的索引，返回哈希槽的索引 hashpos = lookdict_index(mp->ma_keys, hash, ix); assert(hashpos >= 0); assert(old_value != NULL); // 字典的长度减 1 mp->ma_used--; // 更新字典的版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 将索引为 hashpos 的哈希槽的值设置为 DKIX_DUMMY // 即 dk_indices[hashpos] = DKIX_DUMMY // 注意：不能设置为 DKIX_EMPTY，因为要保护冲突探测链不断裂 dictkeys_set_index(mp->ma_keys, hashpos, DKIX_DUMMY); // 获取指定的 entry，即 dk_entries[ix] ep = &DK_ENTRIES(mp->ma_keys)[ix]; ENSURE_ALLOWS_DELETIONS(mp); // 将 me_key 和 me_value 设置为 NULL，伪删除 // 并减少它们指向的对象的引用计数 old_key = ep->me_key; ep->me_key = NULL; ep->me_value = NULL; Py_DECREF(old_key); ASSERT_CONSISTENT(mp); // 返回弹出的 value return old_value;\n} 整个过程和我们之前的分析一样，这里为了更好地理解，我们再举个实际的例子，将整个流程给串一下。 字典存储了三个键值对，显然它们会按照先来后到的顺序存储在 dk_entries 中。然后 \"a\": 1 映射到了索引为 4 的哈希槽，\"b\": 2 映射到了索引为 0 的哈希槽，\"c\": 3 映射到了索引为 6 的哈希槽。当然实际情况未必是这样，这里只是打个比方。 然后我们再添加一个键值对 mp[\"d\"] = 4，首先要将 \"d\" 映射成索引，假设映射出的索引为 0，由于 dk_indices[0] 的值为 1，而 dk_entries[1].me_key 不等于 \"d\"，所以出现冲突，于是哈希值右移 5 位，重新映射。 第二次映射出的索引为 6，由于 dk_indices[6] 的值为 2，而 dk_entries[2].me_key 也不等于 \"d\"，说明第二次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第三次映射出的索引为 4，由于 dk_indices[4] 的值为 0，而 dk_entries[0].me_key 也不等于 \"d\"，说明第三次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第四次映射出的索引为 2，而 dk_indices[2] 的值为 -1，说明该槽没有人用，于是将 entry 追加到键值对数组中，并将它在 dk_entries 中的索引赋值给 dk_indices[2]。还是那句话，实际情况并不一定是这样，这里只是为了方便解释而刻意举的例子。 所以对于 \"d\": 4 这个键值对来说，0 -> 6 -> 4 -> 2 就是它的冲突探测链，在查找的时候也会按照这个顺序进行查找。比如我们获取 mp[\"d\"]，那么会经历如下过程。 将 key=\"d\" 映射成索引，得到 0，但 dk_entries[dk_indices[0]].me_key 不等于 \"d\"，所以改变策略，重新映射。 第二次映射得到索引 6，但 dk_entries[dk_indices[6]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第三次映射得到索引 4，但 dk_entries[dk_indices[4]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第四次映射得到索引 2，发现 dk_entries[dk_indices[2]].me_key 等于 \"d\"，说明找到了指定的 entry，于是返回它的 value。 以上就是查找的整个过程，这时如果将 key=\"c\" 的 entry 删掉，比如执行 mp.pop(\"c\")，那么会发生什么呢？ 因为 \"c\" 映射到了索引为 6 的槽，当它被删除时，要将 dk_entries[dk_indices[6]] 的 me_key 和 me_value 都设置为 NULL，以及将 dk_indices[6] 设置为 DKIX_DUMMY。然后我们再获取 mp[\"d\"]，第二次映射会得到索引 6，发现该槽存储的值为 -2，就知道该槽并不是探测链的终点，于是会继续映射。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表删除元素源码解析","id":"184","title":"哈希表删除元素源码解析"},"185":{"body":"回顾一下字典的结构： 我们说 ma_used 字段表示字典的长度，它充当了 ob_size，而 dk_nentries 字段表示键值对数组中存储的键值对的个数，那么问题来了，这两个字段啥区别呢？从字面意思来看，这两者似乎是等价的。 相信这个问题对你来说没有任何难度，假设当前添加了 4 个键值对，那么 ma_used 和 dk_nentries 就都是 4。但如果再删除一个键值对，那么 ma_used 会变成 3，而 dk_nentries 还是 4。 所以 ma_used 会随着键值对的删除而减少，但 dk_nentries 保持不变，我们验证一下。 from ctypes import * class PyDictKeysObject(Structure): _fields_ = [(\"dk_refcnt\", c_ssize_t), (\"dk_size\", c_ssize_t), (\"dk_lookup\", c_void_p), (\"dk_usable\", c_ssize_t), (\"dk_nentries\", c_ssize_t), (\"dk_indices\", c_char * 8)] class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", POINTER(PyDictKeysObject)), (\"ma_values\", c_void_p)] d = {1: 1, 2: 2, 3: 3, 4: 4}\nobj = PyDictObject.from_address(id(d))\nprint(obj.ma_used) # 4\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 删除一个键值对\nd.pop(1)\nprint(obj.ma_used) # 3\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 再删除一个\nd.pop(2)\nprint(obj.ma_used) # 2\nprint(obj.ma_keys.contents.dk_nentries) # 4 结果和我们分析的一样，这就是 ma_used 和 dk_nentries 的区别。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » ma_used 和 dk_nentries 的区别","id":"185","title":"ma_used 和 dk_nentries 的区别"},"186":{"body":"以上我们就介绍了哈希表是怎么删除元素的，以及相关的具体细节，下一篇文章来说一说字典的创建，以及它的一些方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 小结","id":"186","title":"小结"},"187":{"body":"到目前为止，我们对字典应该已经有了非常细致的了解了，本篇文章来聊一聊字典的创建和相关操作，通过底层的源码实现，来进一步剖析字典。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 楔子","id":"187","title":"楔子"},"188":{"body":"字典在底层对应 PyDictObject 实例，它是怎么创建的呢？解释器提供了 PyDict_New 函数，会创建一个容量为 8 的字典。 // Objects/dictobject.c // 对于结合表，键值对均由 PyDictKeysObject 维护\n// 它一旦被创建，那么 dk_indices 的长度至少是 8\n// 至于 dk_indices 里面的元素初始为 -1，表示哈希槽尚未被使用\nstatic PyDictKeysObject empty_keys_struct = { 1, /* dk_refcnt */ 1, /* dk_size */ lookdict_split, /* dk_lookup */ 0, /* dk_usable (immutable) */ 0, /* dk_nentries */ {DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY}, /* dk_indices */\n}; #define Py_EMPTY_KEYS &empty_keys_struct\nstatic PyObject *empty_values[1] = { NULL }; PyObject *\nPyDict_New(void)\n{ dictkeys_incref(Py_EMPTY_KEYS); return new_dict(Py_EMPTY_KEYS, empty_values);\n} static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 字典也有缓存池，关于缓存池我们之后再说，这里先不管 if (numfree) { mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); _Py_NewReference((PyObject *)mp); } else { // 为字典申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); if (mp == NULL) { // 由于是先为 PyDictKeysObject 申请内存 // 所以当 PyDictObject 的内存申请失败时，还要处理 PyDictKeysObject dictkeys_decref(keys); if (values != empty_values) { free_values(values); } return NULL; } } // 字段初始化，而 keys 和 values 都是外界提前创建好，然后传过来的 mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 所以整个过程分为两步： 先创建 PyDictKeysObject 实例，底层默认提供了一个 Py_EMPTY_KEYS。 再创建 PyDictObject 实例，然后通过 ma_keys 字段使两者建立联系。 PyDictObject 实例的创建过程我们已经知道了，接下来是 PyDictKeysObject 实例的创建，只有它创建了，才能作为参数传递给 new_dict 函数。 // Objects/dictobject.c static PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // USABLE_FRACTION(size) 表示键值对数组的长度 // 它等于哈希索引数组长度的 2/3 usable = USABLE_FRACTION(size); // 基于哈希索引数组的长度，计算每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 不仅是 PyDictObject，PyDictKeysObject 同样也有自己的缓存池 // 关于它的缓存池，同样之后再聊，这里先不关心 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } // 为 PyDictKeysObject 申请内存，当然还包括两个数组 // 哈希索引数组的内存大小为 es * size // 键值对数组的大小为 sizeof(PyDictKeyEntry) * usable else { dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 字段初始化 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // memset 是一个 C 库函数：memset(p, val, size) // 作用是从指针 p 开始，将之后的 size 个字节的值全部初始化为 val // 显然这里是将哈希索引数组的元素都设置为 -1，注：(char)0xff == -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中每个 entry 的字段都设置为 0 // entry 的内存已经申请了，但还没有保存任何的键值对 // 所以将 me_hash、me_key、me_value 全部设置为 0 // 注：对于指针类型来说，赋值为 0 和 NULL 是等价的，因为 NULL 保存的地址就是 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 以上就是 PyDictKeysObject 实例的创建，当它创建完毕后，再作为参数传递给 new_dict 函数创建 PyDictObject 实例，整个过程还是比较简单的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典的创建","id":"188","title":"字典的创建"},"189":{"body":"首先类型对象定义了三个方法簇： tp_as_number：实例对象作为数值型对象拥有的方法； tp_as_sequence：实例对象作为序列型对象拥有的方法； tp_as_mapping：实例对象作为映射型对象拥有的方法； 当然啦，这三个方法簇对实例对象的类型要求并不严格，比如字符串作为序列型对象，也可以实现 tp_as_number，像字符串实现了里面的取模运算符，用于格式化。 那么字典呢，它的这几个方法簇都定义了哪些方法呢？ // Objects/dictobject.c static PySequenceMethods dict_as_sequence = { 0, /* sq_length */ 0, /* sq_concat */ 0, /* sq_repeat */ 0, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyDict_Contains, /* sq_contains */ 0, /* sq_inplace_concat */ 0, /* sq_inplace_repeat */\n}; static PyMappingMethods dict_as_mapping = { (lenfunc)dict_length, /*mp_length*/ (binaryfunc)dict_subscript, /*mp_subscript*/ (objobjargproc)dict_ass_sub, /*mp_ass_subscript*/\n}; 以上就是字典的几个方法簇，我们从 Python 的角度来演示一下。 d = {\"a\": 1, \"b\": 2, \"c\": 3, \"d\": 4} # dict_as_sequence.sq_contains：判断 key 是否存在\nprint(\"a\" in d) # True # dict_as_mapping.dict_length：返回字典长度\nprint(len(d)) # 4 # dict_as_mapping.dict_subscript：基于 key 获取 value\nprint(d[\"a\"]) # 1 # dict_as_mapping.dict_ass_sub：设置 key、value\nd[\"高老师\"] = \"美男子\"\nprint(d[\"高老师\"]) # 美男子 接下来我们就从源码的角度，来看看这些方法是怎么实现的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典都有哪些方法？","id":"189","title":"字典都有哪些方法？"},"19":{"body":"下面来介绍一些常见的类型在底层的定义。 Python 底层的 C API 和对象的命名都遵循统一的标准，比如类型对象均以 Py***_Type 的形式命名，当然啦，它们都是 PyTypeObject 结构体实例。所以我们发现，Python 里的类在底层是以全局变量的形式静态定义好的。 所以实例对象可以有很多个，但对应的类型对象则是唯一的，在底层直接以全局变量的形式静态定义好了。比如列表的类型是 list，列表可以有很多个，但 list 类型对象则全局唯一。 data1 = [1, 2, 3]\ndata2 = [4, 5, 6]\nprint( data1.__class__ is data2.__class__ is list\n) # True 如果站在 C 的角度来理解的话： data1 和 data2 变量均指向了列表，列表在底层对应 PyListObject 结构体实例，里面字段的含义之前说过。但需要注意的是，指针数组里面保存的是对象的指针，而不是对象。不过为了方便，图中就用对象代替了。 然后列表的类型是 list，在底层对应 PyList_Type，它是 PyTypeObject 结构体实例，保存了列表的元信息（比如内存分配信息、支持的相关操作等）。 而将这两者关联起来的便是 ob_type，它位于 PyObject 中，是所有对象都具有的。因为变量只是一个 PyObject * 指针，那么解释器要如何得知变量指向的对象的类型呢？答案便是通过 ob_type 字段。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 一些常见的类型对象","id":"19","title":"一些常见的类型对象"},"190":{"body":"设置键值对，比如 d[\"a\"] = 1，那么会调用 dict_as_mapping 的 mp_ass_subscript，看一下它的具体逻辑。 // Objects/dictobject.c static int\ndict_ass_sub(PyDictObject *mp, PyObject *v, PyObject *w)\n{ // 参数 mp 指向字典，参数 v 指向 key，参数 w 指向 value // 虽然是设置键值对，但如果 w == NULL，那么也可以实现删除的效果 if (w == NULL) return PyDict_DelItem((PyObject *)mp, v); else return PyDict_SetItem((PyObject *)mp, v, w);\n} int\nPyDict_SetItem(PyObject *op, PyObject *key, PyObject *value)\n{ PyDictObject *mp; Py_hash_t hash; if (!PyDict_Check(op)) { PyErr_BadInternalCall(); return -1; } assert(key); assert(value); mp = (PyDictObject *)op; // 如果 key 不是字符串，或者 key 是字符串、但哈希值等于 -1（尚未计算） // 那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 如果是一个空字典，那么调用 insert_to_emptydict if (mp->ma_keys == Py_EMPTY_KEYS) { return insert_to_emptydict(mp, key, hash, value); } // 不是空字典，那么调用 insertdict return insertdict(mp, key, hash, value);\n} 所以最终会调用 insert_to_emptydict 或 insertdict，这里我们直接看 insertdict 函数的具体实现。 // Objects/dictobject.c static int\ninsertdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject *value)\n{ PyObject *old_value; PyDictKeyEntry *ep; Py_INCREF(key); Py_INCREF(value); // 字典有两种结构，分别是分离表和结合表 // 如果是分离表，那么 key 必须全部是字符串，因为它是为对象的属性字典引入的，而属性肯定是字符串 // 所以当字典使用的是分离表，并且插入的 key 不是字符串时，那么要重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) goto Fail; } // 探测函数，将 key 的哈希值映射成索引，该索引是哈希槽的索引 // 然后返回该哈希槽存储的键值对数组的索引，同时修改 old_value Py_ssize_t ix = mp->ma_keys->dk_lookup(mp, key, hash, &old_value); if (ix == DKIX_ERROR) goto Fail; assert(PyUnicode_CheckExact(key) || mp->ma_keys->dk_lookup == lookdict); MAINTAIN_TRACKING(mp, key, value); // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && old_value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) goto Fail; ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 在字典中不存在 if (ix == DKIX_EMPTY) { assert(old_value == NULL); // 如果键值对数组的长度小于等于 0，说明还没有为键值对数组分配内存 // 那么依旧调用 insertion_resize，该函数后续解释 if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) goto Fail; } // 按照相同的规则对 key 的哈希值进行映射，并返回哈希槽的索引 // 如果没有撞上 Dummy 态的哈希槽，那么 dk_indices[hashpos] 会等于 ix // 如果在映射的过程中，撞上了 Dummy 态的哈希槽，那么直接将该槽的索引返回 // 但不管是哪一种情况，我们都找到了一个合法的槽 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // dk_entries[dk_nentries] 便对应新的 entry，由于内存一开始便分配好了 // 因此所谓添加，其实就是修改它的 me_key 和 me_value 字段 // 将这两个字段的值，修改为参数 key 和参数 value ep = &DK_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries]; // 新的 entry 会添加在键值对数组中索引为 mp->ma_keys->dk_nentries 的位置 // 因为键值对始终是按照先来后到的顺序追加的，然后调用 dictkeys_set_index // 将 entry 在键值对数组中的索引，赋值给 mp->ma_keys->dk_indices[hashpos] dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); // 更新 me_key 和 me_value ep->me_key = key; ep->me_hash = hash; // 如果 mp->ma_values 不为空，证明字典使用的是分离表 if (mp->ma_values) { // 分离表的话，value 统一由 mp->ma_values 维护 // 至于 entry 里面的 me_value 字段则始终为 NULL assert (mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 否则说明字典使用的是结合表，将 entry->me_value 的值设置为 value else { ep->me_value = value; } mp->ma_used++; // 字典长度加 1 mp->ma_version_tag = DICT_NEXT_VERSION(); // 更新字典的版本号 mp->ma_keys->dk_usable--; // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_nentries++; // 键值对已存储的 entry 个数加 1 assert(mp->ma_keys->dk_usable >= 0); ASSERT_CONSISTENT(mp); return 0; } // 如果程序走到这里，说明 ix >= 0，即 key 已存在 // 那么当 old_value != value 时，要对值进行更新 if (old_value != value) { // 分离表，更新 mp->ma_values->values[ix] if (_PyDict_HasSplitTable(mp)) { mp->ma_values[ix] = value; if (old_value == NULL) { /* pending state */ assert(ix == mp->ma_used); mp->ma_used++; } } else { // 结合表，获取 entry，更新它的 me_value 字段 assert(old_value != NULL); DK_ENTRIES(mp->ma_keys)[ix].me_value = value; } mp->ma_version_tag = DICT_NEXT_VERSION(); } Py_XDECREF(old_value); /* which **CAN** re-enter (see issue #22653) */ ASSERT_CONSISTENT(mp); Py_DECREF(key); return 0; Fail: Py_DECREF(value); Py_DECREF(key); return -1;\n} 以上就是获取键值对，源码细节和我们之前分析哈希表时说的是一样的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 设置键值对","id":"190","title":"设置键值对"},"191":{"body":"如果是获取 value，比如 v = d[\"a\"]，那么会调用 dict_as_mapping 的 mp_subscript，看一下它的具体逻辑。 // Objects/dictobject.c\nstatic PyObject *\ndict_subscript(PyDictObject *mp, PyObject *key)\n{ Py_ssize_t ix; Py_hash_t hash; PyObject *value; // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1，那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 探测函数，将 key 映射成索引，并返回对应的哈希槽存储的键值对数组的索引 // 并且在函数内部，还会对参数 value 进行修改，所以这里要传递二级指针 // 如果键值对存在，那么参数 value 就是对应的值，否则 value 会等于 NULL ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 当 ix == -1 或 value == NULL 时，说明 key 对应的键值对不存在 if (ix == DKIX_EMPTY || value == NULL) { if (!PyDict_CheckExact(mp)) { // 但如果 mp 不是字典，即 type(mp) is not dict // 那么说明 mp 的类型一定继承了 dict PyObject *missing, *res; _Py_IDENTIFIER(__missing__); // 检测 mp 是否定义了 __missing__ 方法，如果定义了则调用 // 所以该方法要定义在继承了 dict 的子类中 missing = _PyObject_LookupSpecial((PyObject *)mp, &PyId___missing__); if (missing != NULL) { res = PyObject_CallFunctionObjArgs(missing, key, NULL); Py_DECREF(missing); return res; } else if (PyErr_Occurred()) return NULL; } // 到这里说明 key 不存在，并且也没有定义 __missing__，那么 KeyError _PyErr_SetKeyError(key); return NULL; } // 否则说明键值对存在，那么增加引用计数，返回 value Py_INCREF(value); return value;\n} 所以获取 value 的话，也比较简单，关键在于里面有一个 __missing__ 方法，我们来解释一下。 class Dict(dict): def __getitem__(self, item): return super().__getitem__(item) def __missing__(self, key): return f\"不存在的 key：{key}\" d = Dict({\"a\": 1, \"b\": 2})\n# 会执行 Dict.__getitem__(d, \"a\")\n# 在内部会调用字典的 __getitem__\nprint(d[\"a\"]) # 1\nprint(d[\"b\"]) # 2 # 而在调用字典的 __getitem__ 时，如果发现 key 不存在\n# 那么会尝试寻找 __missing__ 方法\nprint(d[\"c\"]) # 不存在的 key：c\nprint(d[\"高老师\"]) # 不存在的 key：高老师 以上就是获取键值对。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 基于 key 获取 value","id":"191","title":"基于 key 获取 value"},"192":{"body":"关于字典是怎么创建的，以及它添加键值对、基于键获取值的源码细节，我们就分析完了。当然还没有结束，字典还有很多的自定义方法，我们下一篇文章来剖析这些自定义方法的实现细节。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 小结","id":"192","title":"小结"},"193":{"body":"上一篇文章我们介绍了字典的创建过程，和一些基本操作，这些操作都对应一个魔法方法。但除了这些魔法方法之外，每个对象还可以单独定义很多自己的方法，这些方法统一由类型对象的 tp_methods 字段维护，当然这些之前已经说过了。 里面有很多的自定义方法，比如 get、pop、setdefault 等等，我们来剖析一下。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 楔子","id":"193","title":"楔子"},"194":{"body":"获取指定 key 对应的 value，如果 key 不存在，那么返回默认值。 d = {\"name\": \"古明地觉\"}\nprint(d.get(\"name\"))\n\"\"\"\n古明地觉\n\"\"\"\n# key 不存在，返回默认值 None\nprint(d.get(\"desc\"))\n\"\"\"\nNone\n\"\"\"\n# 当然也可以指定默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\" 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_GET_METHODDEF \\ {\"get\", (PyCFunction)(void(*)(void))dict_get, METH_FASTCALL, dict_get__doc__}, static PyObject *\ndict_get(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; // 返回值 PyObject *key; // 指定的 key PyObject *default_value = Py_None; // 默认值，默认为 None // get 方法接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"get\", nargs, 1, 2)) { goto exit; } // args[0] 便是指定的 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 便是传入的默认值，如果有的话 default_value = args[1];\nskip_optional: // 调用 dict_get_impl return_value = dict_get_impl(self, key, default_value); exit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_get_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val = NULL; Py_hash_t hash; // 哈希值 Py_ssize_t ix; // 哈希槽存储的键值对数组的索引 // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 获取 key 对应的哈希槽存储的键值对数组的索引 ix = (self->ma_keys->dk_lookup) (self, key, hash, &val); if (ix == DKIX_ERROR) return NULL; // key 不存在，那么将默认值赋值给 val if (ix == DKIX_EMPTY || val == NULL) { val = default_value; } // 增加 val 的引用计数，然后返回 Py_INCREF(val); return val;\n} 以上就是字典的 get 方法，非常简单。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 get 方法","id":"194","title":"字典的 get 方法"},"195":{"body":"这是一个非常强大的方法，但是用的人不是很多。它和 get 方法类似，都是传入一个 key 和一个默认值，如果 key 存在，那么返回 key 对应的 value，否则返回默认值。但它和 get 方法不同的是，setdefault 在 key 不存在时，会将 key 和默认值添加到字典中。 d = {\"name\": \"古明地觉\"}\n# 当 key 存在时，两个方法的效果是一样的，都等价于 d[key]\nprint(d.get(\"name\"))\nprint(d.setdefault(\"name\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 但当 key 不存在时，就有差别了\n# \"desc\" 这个 key 不存在，返回默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 并且原始的字典不受影响\nprint(d)\n\"\"\"\n{'name': '古明地觉'}\n\"\"\" # 但对于 setdefault 来说，key 不存在时\n# 会将 key 和默认值添加进去，然后返回默认值\nprint(d.setdefault(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 原始的字典会发生改变\nprint(d)\n\"\"\"\n{'name': '古明地觉', 'desc': '地灵殿美少女'}\n\"\"\" 所以当获取的 key 不存在时，v = d.setdefault(key, value) 等价于如下。 d[key] = value v = d[key] 那么 setdefault 一般用在什么地方呢？举个例子。 data = [ (\"古明地觉\", \"2020\", 5), (\"古明地觉\", \"2020\", 2), (\"古明地觉\", \"2021\", 1), (\"古明地觉\", \"2021\", 4), (\"古明地觉\", \"2021\", 3), (\"芙兰朵露\", \"2022\", 7), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2023\", 4), (\"芙兰朵露\", \"2023\", 1)\n]\n# 对于上面这种数据，我们需要变成下面这个样子\n\"\"\"\n{ '古明地觉': { '2020': [5, 2], '2021': [1, 4, 3] }, '芙兰朵露': { '2022': [7, 3, 3], '2023': [4, 1] }\n}\n\"\"\"\n# 如果使用 setdefault 方法，就非常好解决了\nd = {}\nfor name, year, cnt in data: d.setdefault(name, {}).setdefault(year, []).append(cnt)\nprint(d) 下面来看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_SETDEFAULT_METHODDEF \\ {\"setdefault\", (PyCFunction)(void(*)(void))dict_setdefault, METH_FASTCALL, dict_setdefault__doc__}, static PyObject *\ndict_setdefault(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 这部分和 get 方法是类似的 PyObject *return_value = NULL; PyObject *key; PyObject *default_value = Py_None; if (!_PyArg_CheckPositional(\"setdefault\", nargs, 1, 2)) { goto exit; } key = args[0]; if (nargs < 2) { goto skip_optional; } default_value = args[1];\nskip_optional: return_value = dict_setdefault_impl(self, key, default_value);\nexit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_setdefault_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val; val = PyDict_SetDefault((PyObject *)self, key, default_value); Py_XINCREF(val); return val;\n} 所以核心在于 PyDict_SetDefault 函数，这个函数比较长，但逻辑不难理解。 // Objects/dictobject.c\nPyObject *\nPyDict_SetDefault(PyObject *d, PyObject *key, PyObject *defaultobj)\n{ PyDictObject *mp = (PyDictObject *)d; PyObject *value; Py_hash_t hash; if (!PyDict_Check(d)) { PyErr_BadInternalCall(); return NULL; } // 获取哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 如果 mp->ma_keys 等于 Py_EMPTY_KEYS，证明字典是空的，那么 key 肯定不存在 // 将 key 和 defaultobj 添加进字典中，并返回 defaultobj if (mp->ma_keys == Py_EMPTY_KEYS) { if (insert_to_emptydict(mp, key, hash, defaultobj) < 0) { return NULL; } return defaultobj; } // 如果字典使用的是分离表，并且 key 不是字符串 // 意味着字典的结构要发生改变，重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) return NULL; } // 获取哈希槽存储的键值对数组的索引 Py_ssize_t ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) { return NULL; } ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 不存在，那么要先添加键值对 if (ix == DKIX_EMPTY) { PyDictKeyEntry *ep, *ep0; value = defaultobj; // 是否还有可用空间，如果没有，调用 insertion_resize if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) { return NULL; } } // 返回 key 映射之后的哈希槽的索引 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // 新添加的 entry 在键值对数组中的索引为 mp->ma_keys->dk_nentries // 将该索引赋值给 dk_indices[hashpose] ep0 = DK_ENTRIES(mp->ma_keys); ep = &ep0[mp->ma_keys->dk_nentries]; dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); Py_INCREF(key); Py_INCREF(value); MAINTAIN_TRACKING(mp, key, value); ep->me_key = key; ep->me_hash = hash; // 如果字典是分离表 if (_PyDict_HasSplitTable(mp)) { // 值由 mp->ma_values 存储 assert(mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 如果字典是结合表，那么键和值均保存在 entry 中 else { ep->me_value = value; } // 字典长度加 1 mp->ma_used++; // 修改版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_usable--; // 键值对数组已经容纳的 entry 个数加 1 mp->ma_keys->dk_nentries++; assert(mp->ma_keys->dk_usable >= 0); } // ... ASSERT_CONSISTENT(mp); // 返回 value return value;\n} 以上便是 setdefault 方法。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 setdefault 方法","id":"195","title":"字典的 setdefault 方法"},"196":{"body":"字典的 pop 方法之前已经说过了，这里来看一下 popitem 方法。 d = {\"x\": 1, \"y\": 2, \"z\": 3}\n# pop 方法可以弹出指定的 key，并返回对应的 value\n# 如果 key 不存在，并且没有指定默认值，会抛出 KeyError，否则返回默认值\nprint(d.pop(\"x\")) # 1 # 而 popitem 方法则是弹出字典的最后一个键值对\nd = {\"x\": 1, \"y\": 2, \"z\": 3}\nprint(d.popitem()) # ('z', 3)\nprint(d) # {'x': 1, 'y': 2} 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_POPITEM_METHODDEF \\ {\"popitem\", (PyCFunction)dict_popitem, METH_NOARGS, dict_popitem__doc__}, static PyObject *\ndict_popitem(PyDictObject *self, PyObject *Py_UNUSED(ignored))\n{ return dict_popitem_impl(self);\n} // Objects/dictobject.c\nstatic PyObject *\ndict_popitem_impl(PyDictObject *self)\n{ Py_ssize_t i, j; PyDictKeyEntry *ep0, *ep; PyObject *res; // 返回值，一个二元组，负责存储 key 和 value res = PyTuple_New(2); if (res == NULL) return NULL; // 如果字典的长度为 0，那么抛出 KeyError if (self->ma_used == 0) { Py_DECREF(res); PyErr_SetString(PyExc_KeyError, \"popitem(): dictionary is empty\"); return NULL; } // 如果字典使用分离表，那么当 popitem 之后，要重构为结合表 // 分离表要求 key 必须全部是字符串，并且不能删除键值对 if (self->ma_keys->dk_lookup == lookdict_split) { if (dictresize(self, DK_SIZE(self->ma_keys))) { Py_DECREF(res); return NULL; } } ENSURE_ALLOWS_DELETIONS(self); // 获取键值对数组 ep0 = DK_ENTRIES(self->ma_keys); // ma_keys->dk_nentries 表示键值对数组中已使用的 entry 个数 // 那么 entry 的最大索引就是 ma_keys->dk_nentries - 1 i = self->ma_keys->dk_nentries - 1; // 从 i 开始往前遍历，找到第一个 me_value != NULL 的 entry // 因为被删除的 entry 依旧会驻留在键值对数组中，但 me_key、me_value 被设置为 NULL while (i >= 0 && ep0[i].me_value == NULL) { i--; } assert(i >= 0); // 获取 entry ep = &ep0[i]; // 基于哈希槽存储的索引，获取哈希槽的索引 j = lookdict_index(self->ma_keys, ep->me_hash, i); assert(j >= 0); assert(dictkeys_get_index(self->ma_keys, j) == i); // 因为 entry 被删除了，所以对应的哈希槽存储的值要修改为 DKIX_DUMMY dictkeys_set_index(self->ma_keys, j, DKIX_DUMMY); // 将 key 和 value 保存在元组中 PyTuple_SET_ITEM(res, 0, ep->me_key); PyTuple_SET_ITEM(res, 1, ep->me_value); // 因为被弹出了，所以 entry 的 me_key 和 me_value 要重置为 NULL ep->me_key = NULL; ep->me_value = NULL; // 这一步一会儿解释 self->ma_keys->dk_nentries = i; // 键值对个数减 1 self->ma_used--; self->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(self); return res;\n} 以上就是 popitem 方法，但是里面有一行 self->ma_keys->dk_nentries = i 估计让人有些费解，我们解释一下。 首先当键值对数组的空间申请之后，entry 就已经存在了，初始状态下的 entry 的 me_key 和 me_value 均为 NULL。所以一个被伪删除的 entry 和初始的 entry 是等价的，下面假设有这么一个键值对数组。 对于一个容量为 16 的哈希表，它的键值对数组的长度为 10，由于 dk_nentries = 7，说明键值对数组使用了 7 个 entry。而在之后，第 2 个 entry 和第 7 个 entry 被删除了，一旦删除，那么它的 me_key 和 me_value 会被重置为 NULL，和初始 entry 是等价的。 这时候如果执行 popitem，那么会弹出最后一个 me_value 不为 NULL 的 entry，即没有被伪删除的 entry，对于当前来说就是第 6 个 entry。所以源码中的 i 初始等于 dk_nentries - 1，然后往前遍历，最终会找到索引为 5 的 entry，所以循环之后 i = 5。然后将索引为 5 的 entry 的 me_key 和 me_value 设置为 NULL，因为它被删除了。 注意：这里关键来了，既然变量 i 保存的是最后一个 me_value != NULL 的 entry 的索引，那么当它被删除之后，就意味着从索引 i 开始，后面所有的 entry 都相当于回归到了初始状态，那么直接将 dk_nentries 设置为 i。 由于 dk_nentries 被设置为 i，后续再添加键值对时，就会添加到索引为 i 的位置。对于当前来说，添加键值对时，修改的是 dk_entries[5] 的 me_key 和 me_value，而不是 dk_entries[7] 的 me_key 和 me_value。 所以通过 popitem 方法，被删除的 entry 是有可能实现复用的。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 popitem 方法","id":"196","title":"字典的 popitem 方法"},"197":{"body":"以上我们就简单分析了字典的几个自定义方法，下一篇文章来聊一聊字典的扩容。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 小结","id":"197","title":"小结"},"198":{"body":"在介绍字典的底层结构时我们看到，当已使用的 entry 数量达到总容量的 2/3 时，会发生扩容。 而在早期，哈希表只使用一个键值对数组，这个键值对数组不仅要存储具体的 entry，还要承载哈希索引数组的功能。本来这个方式很简单，但是内存浪费严重，于是后面 Python 官方就将一个数组拆成两个数组来实现。 不是说只能用 2/3 吗？那就只给键值对数组申请 2/3 容量的空间，并且只负责存储键值对。至于索引，则由哈希索引数组来承载。通过将 key 映射成索引，找到指定的哈希槽，再根据槽里面存储的索引，找到键值对数组中存储的 entry。 因此减少内存开销的核心就在于，避免键值对数组的浪费。 所以哈希索引数组的长度就可以看成是哈希表的容量，而键值对数组的长度本身就是哈希索引数组长度的 2/3、或者说容量的 2/3。那么很明显，当键值对数组满了，就说明当前的哈希表要扩容了。 // Objects/dictobject.c\n#define GROWTH_RATE(d) ((d)->ma_used*3) 扩容之后的新哈希表的容量要大于等于 ma_used * 3，注意是大于等于 ma_used * 3，不是 dk_nentries * 3。因为 dk_nentries 还包含了被删除的 entry，但哈希表在扩容的候会将其丢弃，所以扩容之后新哈希表的容量取决于 ma_used。 当然啦，哈希表的容量还要等于 2 的幂次方，所以有两个条件： 大于等于 ma_used * 3； 等于 2 的幂次方； 基于以上两个限制条件，取到的最小值便是扩容之后的容量。而扩容的具体过程我们稍后会介绍，目前先来回顾一下基础知识。 以上是字典的底层结构，假设变量 mp 指向了 PyDictObject 实例，那么可以得到如下信息。 mp->ma_keys->dk_indices 便是哈希索引数组，它的长度便是哈希表的容量。 mp->ma_keys->dk_entries 便是键值对数组，里面的一个 entry 就是一个键值对。 如果字典使用的是结合表，那么 entry 的 me_key、me_value 字段负责存储键和值，此时 mp->ma_values 为 NULL。 如果字典使用的是分离表，那么 entry 的 me_key 字段负责存储键，me_value 字段则始终为 NULL，此时由 mp->ma_values 负责存储值，这种做法可以让多个字典共享一组 key，从而节省内存。 因为分离表是 Python 针对实例对象的属性字典单独设计的，我们平时创建的都是结合表，所以一开始并没有讨论分离表。但分离表其实非常简单，这里来补充一下吧。现在假设有一个字典，里面有三个键值对 \"a\": 1, \"b\": 2, \"c\": 3，我们看一下分别使用结合表和分离表存储时，字典的结构是什么样子。 所以结合表是键和值存在一起，分离表是键和值分开存储，非常好理解。我们自己创建的字典，使用的都是结合表，分离表是为了减少对象属性字典的内存使用而专门引入的。因此对于一个分离表而言，它的 key 一定都是字符串，否则不可能是分离表。而如果 key 都是字符串，那么既可以是分离表，也可以是结合表。 接着是转换关系：分离表可以重构为结合表，但反过来不行。 好，下面我们来看一下扩容逻辑，它由 dictresize 函数负责。 // Objects/dictobject.c #define PyDict_MINSIZE 8 static int\ndictresize(PyDictObject *mp, Py_ssize_t minsize)\n{ // 参数 minsize 表示字典的 ma_used * 3，即长度 * 3 Py_ssize_t newsize, numentries; // mp->ma_keys PyDictKeysObject *oldkeys; // mp->ma_values PyObject **oldvalues; // mp->ma_values->dk_entries PyDictKeyEntry *oldentries, *newentries; /* Find the smallest table size > minused. */ // 初始容量为 8，如果 newsize < minsize，那么不断循环 // 直到条件不满足时，便找到了大于等于 minsize 的最小 2 的幂次方数 // newsize 便是字典扩容之后的新容量 for (newsize = PyDict_MINSIZE; newsize < minsize && newsize > 0; newsize <<= 1) ; if (newsize <= 0) { PyErr_NoMemory(); return -1; } // 获取扩容之前的 ma_keys oldkeys = mp->ma_keys; // 在介绍字典的创建时，我们说过这个函数，它负责为 PyDictKeysObject 实例申请内存 mp->ma_keys = new_keys_object(newsize); if (mp->ma_keys == NULL) { mp->ma_keys = oldkeys; return -1; } assert(mp->ma_keys->dk_usable >= mp->ma_used); // 设置探测函数 if (oldkeys->dk_lookup == lookdict) mp->ma_keys->dk_lookup = lookdict; // 字典的长度 numentries = mp->ma_used; // 扩容之前的键值对数组 oldentries = DK_ENTRIES(oldkeys); // 扩容之后的键值对数组 newentries = DK_ENTRIES(mp->ma_keys); // 扩容之前的 ma_values oldvalues = mp->ma_values; // 如果 oldvalues 不为 NULL，说明字典使用的是分离表 // 那么当字典发生扩容时，要转成结合表 if (oldvalues != NULL) { // 将旧的键值对数组的 entry 拷贝到新的键值对数组中 for (Py_ssize_t i = 0; i < numentries; i++) { assert(oldvalues[i] != NULL); PyDictKeyEntry *ep = &oldentries[i]; PyObject *key = ep->me_key; Py_INCREF(key); // key 始终存储在 entry 中 newentries[i].me_key = key; // 设置哈希值 newentries[i].me_hash = ep->me_hash; // 将 mp->ma_values 里面的值，赋值给 entry->me_value newentries[i].me_value = oldvalues[i]; } // 旧的 ma_keys 和 ma_values 要释放掉 dictkeys_decref(oldkeys); mp->ma_values = NULL; if (oldvalues != empty_values) { free_values(oldvalues); } } // 说明字典使用的是结合表，重构的结果依旧是结合表 else { // combined table. // 如果 entry 的数量等于字典的长度，说明没有被删除的 entry，那么直接 memcpy 过去即可 if (oldkeys->dk_nentries == numentries) { memcpy(newentries, oldentries, numentries * sizeof(PyDictKeyEntry)); } // 否则遍历 oldentries，将 me_value != NULL 的 entry 拷贝过去 else { PyDictKeyEntry *ep = oldentries; for (Py_ssize_t i = 0; i < numentries; i++) { while (ep->me_value == NULL) ep++; newentries[i] = *ep++; } } assert(oldkeys->dk_lookup != lookdict_split); assert(oldkeys->dk_refcnt == 1); // 缓存池逻辑，后续聊 if (oldkeys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { _Py_DEC_REFTOTAL; keys_free_list[numfreekeys++] = oldkeys; } else { _Py_DEC_REFTOTAL; PyObject_FREE(oldkeys); } } // 到此键值对数组的元素就拷贝完了，然后还要进行索引映射，并存储在哈希槽中 build_indices(mp->ma_keys, newentries, numentries); // dk_usable 表示还可以容纳多少个键值对 // dk_nentries 表示已经容纳了多少个键值对 // 而 numentries 表示字典的长度，所以重构之后 // dk_usable 的大小要减去 numentries，dk_nentries 直接等于 numentries mp->ma_keys->dk_usable -= numentries; mp->ma_keys->dk_nentries = numentries; return 0;\n} 因为要对哈希表的种类分情况讨论，所以导致代码有点长，但逻辑不难理解： 首先确定哈希表的容量，它要满足 2 的幂次方，并且大于等于 ma_used * 3。 为 ma_keys 重新申请内存。 根据哈希表的种类分情况讨论，但核心都是将旧的没有被删除的 entry 搬过去。 释放 ma_keys，如果字典之前是分离表，还要释放 ma_values。 以上就是哈希表的扩容，或者说字典的扩容，我们就介绍到这儿，下一篇文章来介绍字典的缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"46. 字典是怎么扩容的？它会经历哪些过程？","id":"198","title":"46. 字典是怎么扩容的？它会经历哪些过程？"},"199":{"body":"本篇文章来聊一聊字典的缓存池，我们知道字典有一个 ma_keys 字段和一个 ma_values 字段。当哈希表为分离表时，键由 ma_keys 维护，值由 ma_values 维护；当哈希表为结合表时，键和值均由 ma_keys 维护。 那么当我们销毁一个 PyDictObject 时，也肯定要先释放 ma_keys 和 ma_values。 如果是分离表，会将每个 value 的引用计数减 1，然后释放 ma_values；再将每个 key 的引用计数减 1，然后释放 ma_keys。最后再释放 PyDictObject 本身。 如果是结合表，由于 key、value 都在 ma_keys 中，将每个 key、value 的引用计数减 1 之后，只需释放 ma_keys 即可。最后再释放 PyDictObject 本身。 整个过程还是很清晰的，只不过这里面遗漏了点什么东西，没错，就是缓存池。在介绍浮点数的时候，我们说不同的对象都有自己的缓存池，当然字典也不例外。并且除了 PyDictObject 之外，PyDictKeysObject 也有相应的缓存池，毕竟它负责存储具体的键值对。 那么下面我们就来研究一下这两者的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 楔子","id":"199","title":"楔子"},"2":{"body":"我们上面说了， Python 解释器 = Python 编译器 + Python 虚拟机 ，当解释器执行 py 文件时都经历了哪些过程呢？ Read File、Scanner、Parser、Compiler 都是由 Python 编译器负责的，Code Eval 则由 Python 虚拟机负责。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。 而 Python 编译器和 Python 虚拟机组合起来，便是 Python 解释器。 如果你了解 Java，那么应该知道 Java 也有编译器和虚拟机。只不过 Java 的编译器和虚拟机是分开的，而 Python 则是整合在一起的。 不过在后续介绍 Python 源码的时候，我们暂不涉及 Python 编译器的部分，也就是 Parser 目录里面的代码不做分析，因为涉及到编译原理。而且编译这一过程也不是 Python 语言独有的，任何一门编程语言、当然还有 SQL 都会涉及到编译。所以探究 Python 代码的编译过程没太大意义，我们的重点是 Python 代码的编译结果，以及虚拟机是如何执行的？","breadcrumbs":"1. CPython 源码长什么样子？ » 解释器、编译器、虚拟机","id":"2","title":"解释器、编译器、虚拟机"},"20":{"body":"不同类型的实例对象，在底层由不同的结构体实现，比如整数对应 PyLongObject 实例、浮点数对应 PyFloatObject 实例、列表对应 PyListObject 实例等等。 但所有的类型对象，在底层由同一个结构体实现，它们都是 PyTypeObject 实例。而 PyTypeObject 结构体在实例化时，内部字段接收的值不同，那么生成的类型对象也不同，可以是 PyLong_Type、PyFloat_Type、PyList_Type 等等。并且每个类型对象都是唯一的，比如在程序中可以创建很多个列表（PyListObject 实例），但类型对象 <class 'list'>（PyList_Type）只会存在一个。 因为类型对象都是静态定义在源码中的，并以全局变量的形式存在。而将实例对象和类型对象关联起来的，则是实例对象的 ob_type 字段，在 Python 里面可以通过调用 type 或者获取 __class__ 属性查看。 关于类型对象的更多内容，后续会继续介绍。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 小结","id":"20","title":"小结"},"200":{"body":"字典的缓存池和列表的缓存池高度相似，都是采用数组实现的，并且容量也是 80 个。 // Objects/dictobject.c\n#define PyDict_MAXFREELIST 80 static PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0; 下面看一下字典的销毁过程，因为放入缓存池这个动作，一定是在对象销毁时发生的。 // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 将 dk_refcnt 减 1 // 如果字典是结合表，那么 dk->dk_refcnt 减 1 之后一定为 0 // 如果字典是分离表，那么 dk->dk_refcnt 减 1 之后则不一定为 0 if (--dk->dk_refcnt == 0) { // 释放 ma_keys，该函数稍后再聊 free_keys_object(dk); }\n} static void\ndict_dealloc(PyDictObject *mp)\n{ PyObject **values = mp->ma_values; PyDictKeysObject *keys = mp->ma_keys; Py_ssize_t i, n; // 因为要被销毁，所以让 GC 不再跟踪 PyObject_GC_UnTrack(mp); // 用于延迟释放 Py_TRASHCAN_BEGIN(mp, dict_dealloc) // 如果 values 不为 NULL，说明是分离表 if (values != NULL) { if (values != empty_values) { // 将每个 value 的引用计数减 1 for (i = 0, n = mp->ma_keys->dk_nentries; i < n; i++) { Py_XDECREF(values[i]); } // 释放 ma_values free_values(values); } // 将 ma_keys->dk_refcnt 减 1，至于是否会释放 ma_keys // 则看是否还有其它组的 value 使用它 dictkeys_decref(keys); } // 否则说明是结合表 else if (keys != NULL) { // 结合表的话，dk_refcnt 一定等于 1，因为每组 value 都独占一组 key assert(keys->dk_refcnt == 1); // dk_refcnt 减 1 之后等于 0，内部会调用 free_keys_object // 在里面会先将每个 key、value 的引用计数减 1，然后再释放 ma_keys dictkeys_decref(keys); } // 如果 numfree 没达到 80，那么放入缓存池 if (numfree < PyDict_MAXFREELIST && Py_TYPE(mp) == &PyDict_Type) // PyDictObject 缓存池是一个数组，直接添加在数组的尾部即可，然后 numfree 自增 1 free_list[numfree++] = mp; else // 否则将空间交还给系统堆 Py_TYPE(mp)->tp_free((PyObject *)mp); Py_TRASHCAN_END\n} 同理，当创建字典时，也会优先从缓存池里面获取。 // Objects/dictobject.c static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 如果 numfree != 0，证明缓存池有可用元素 if (numfree) { // 从缓存池当中获取 mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); // 将引用计数设置为 1 _Py_NewReference((PyObject *)mp); } else { // 否则从堆区申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); // ... } // 初始化字段，然后返回 (PyObject *)mp mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 因此在缓存池的实现上，字典和列表有着很高的相似性。不仅都由数组实现，在销毁的时候也会放在数组的尾部，创建的时候也会从数组的尾部获取。当然啦，因为这么做符合数组的特性，如果销毁和创建都是在数组的头部操作，那么时间复杂度就从 O(1) 变成了 O(n)。 我们用 Python 来测试一下： d1 = {k: 1 for k in \"abcdef\"}\nd2 = {k: 1 for k in \"abcdef\"}\nprint(\"id(d1):\", id(d1))\nprint(\"id(d2):\", id(d2))\n# 放到缓存池的尾部\ndel d1\ndel d2\n# 缓存池：[d1, d2] # 从缓存池的尾部获取\n# 显然 id(d3) 和上面的 id(d2) 是相等的\nd3 = {k: 1 for k in \"abcdefghijk\"}\n# id(d4) 和上面的 id(d1) 是相等的\nd4 = {k: 1 for k in \"abcdefghijk\"}\nprint(\"id(d3):\", id(d3))\nprint(\"id(d4):\", id(d4))\n\"\"\"\nid(d1): 140079181793600\nid(d2): 140079181775488\nid(d3): 140079181775488\nid(d4): 140079181793600\n\"\"\" 输出结果和我们的预期是相符合的，以上就是 PyDictObject 的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictObject 缓存池","id":"200","title":"PyDictObject 缓存池"},"201":{"body":"PyDictKeysObject 也有自己的缓存池，同样基于数组实现，大小是 80。 // Objects/dictobject.c #define PyDict_MAXFREELIST 80\n// PyDictObject 缓存池以及容量\nstatic PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0;\n// PyDictKeysObject 缓存池以及容量\nstatic PyDictKeysObject *keys_free_list[PyDict_MAXFREELIST];\nstatic int numfreekeys = 0; 来看一下 PyDictKeysObject 的销毁过程： // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 分离表：多组 value 可以共享一组 key // 结合表：每组 value 独占一组 key // 因此要先将 dk_refcnt 减 1，如果结果为 0，那么才能释放 ma_keys if (--dk->dk_refcnt == 0) { free_keys_object(dk); }\n} static void\nfree_keys_object(PyDictKeysObject *keys)\n{ // 获取键值对数组 PyDictKeyEntry *entries = DK_ENTRIES(keys); Py_ssize_t i, n; // 遍历 dk_entries，减少 key、value 的引用计数 for (i = 0, n = keys->dk_nentries; i < n; i++) { Py_XDECREF(entries[i].me_key); // 如果是分离表，那么 me_value == NULL // 而当参数为 NULL 时，Py_XDECREF 不做任何处理 Py_XDECREF(entries[i].me_value); } // 放入缓存池，除了要保证缓存池没满之外，还要保证 dk_size = 8 // 也就是说，只有容量为 8 的哈希表的 PyDictKeysObject 才会被缓存 if (keys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { keys_free_list[numfreekeys++] = keys; return; } // 如果条件不满足，释放 ma_keys，将内存交还给系统堆 PyObject_FREE(keys);\n} 所以 PyDictKeysObject 的缓存池和列表的缓存池同样是高度相似的，只不过它想要被缓存，除了保证缓存池有剩余空间之外，还要满足哈希表的容量等于 8，这个限制是出于对内存方面的考量。 以上是 ma_keys 的销毁过程，再来看看它的创建过程。 // Objects/dictobject.c // 为 PyDictKeysObject 实例申请内存\nstatic PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // 获取键值对数组的长度 usable = USABLE_FRACTION(size); // 计算哈希索引数组中每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 如果容量等于 8，并且缓存池有可用元素，那么从缓存池中获取 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } else { // 否则在堆区申请内存，而内存包含三部分 // sizeof(PyDictKeysObject)：结构体 PyDictKeysObject 的大小 // es * size：哈希索引数组的大小 // sizeof(PyDictKeyEntry) * usable)：键值对数组的大小 dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 初始化字段 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // 将哈希索引数组中的每个元素都设置成 -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中的每个元素（entry）的所有字段都设置成 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 非常简单，我们来验证一下。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d1 = {k: 1 for k in \"komeiji satori\"}\nprint( \"d1.ma_keys:\", PyDictObject.from_address(id(d1)).ma_keys\n)\n# 键值对个数超过了 8，哈希表的容量必然也超过了 8\n# 那么当销毁 d1 的时候，d1.ma_keys 不会被缓存，而是会直接释放掉\ndel d1 d2 = {k: 1 for k in \"abc\"}\nprint( \"d2.ma_keys:\", PyDictObject.from_address(id(d2)).ma_keys\n)\n# 容量等于 8，所以 d2.ma_keys 会被缓存\ndel d2 d3 = {k: 1 for k in \"komeiji koishi\"}\nprint( \"d3.ma_keys:\", PyDictObject.from_address(id(d3)).ma_keys\n)\n# 尽管 d2 的 ma_keys 被缓存起来了，但是 d3 的 dk_size 大于 8\n# 因此它不会从缓存池中获取，而是重新创建 d4 = {k: 1 for k in \"abc\"}\nprint( \"d4.ma_keys:\", PyDictObject.from_address(id(d4)).ma_keys\n)\n# d4 的 dk_size 等于 8，因此它会从缓存池中获取，从而复用被销毁的 d2.ma_keys\n# 最终打印结果如下\n\"\"\"\nd1.ma_keys: 94324986272656\nd2.ma_keys: 140165216613312\nd3.ma_keys: 140165225069456\nd4.ma_keys: 140165216613312\n\"\"\" 从打印的结果来看，由于 d4.ma_keys 和 d2.ma_keys 是相同的，因此证实了我们的结论。不像列表和字典，它们是只要被销毁，就会放到缓存池里面，因为它们没有存储具体的数据，大小是固定的。但 PyDictKeysObject 不同，由于它存储了 entry，每个 entry 占 24 字节，如果内部的 entry 非常多，那么缓存起来会有额外的内存开销。因此 Python 的策略是，只有在哈希表容量等于 8 的时候，才会缓存。当然这三者在缓存池的实现上，是基本一致的。 不难看出，Python 在性能和内存使用方面都做了考量。但如果你追求更高的效率，那么也可以自己定制 Python 解释器，比如增大缓存池的容量等等，用更多的空间去换取时间。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictKeysObject 缓存池","id":"201","title":"PyDictKeysObject 缓存池"},"202":{"body":"到此，字典相关的内容就全部介绍完了。和元组一样，字典也在我们看不到的地方被大量使用，比如对象的属性字典、名字空间等等。正因为解释器内部也在大量使用字典，所以字典是一个被高度优化的数据结构，不仅要保证搜索效率，还要减少内存使用。 下一篇文章，我们来介绍 Python 的集合。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 小结","id":"202","title":"小结"},"203":{"body":"本篇文章来聊一聊 Python 的集合是怎么实现的？前面我们介绍了字典的实现原理，它底层是基于哈希表实现的，而集合也是如此。 事实上，集合就类似于没有 value 的字典。","breadcrumbs":"48. 解密集合的实现原理 » 楔子","id":"203","title":"楔子"},"204":{"body":"那么集合都有哪些用处呢？ 1）去重 chars = [\"a\", \"b\", \"a\", \"c\", \"c\"] print( list(set(chars))\n) # ['b', 'a', 'c'] 比如你需要监听一个队列，处理接收到的消息，但每一条消息都有一个编号，要保证具有相同编号的消息只能被处理一次，要怎么做呢？ 显然集合此时就派上用场了，我们可以创建一个集合，每来一条消息，就检测它的编号是否在集合中。如果存在，则说明消息已经被处理过了，忽略掉；如果不存在，说明消息还没有被处理，那么就将它的编号添加到集合中，然后处理消息。 2）判断某个序列是否包含指定的多个元素 data = [\"S\", \"A\", \"T\", \"O\", \"R\", \"I\"] # 现在要判断 data 是否包含 \"T\"、\"R\" 和 \"I\"\n# 如果使用列表的话\nprint( \"T\" in data and \"R\" in data and \"I\" in data\n) # True # 显然使用列表比较麻烦，并且效率也不高，于是我们可以使用集合\nprint( set(data) >= {\"T\", \"R\", \"I\"}\n) # True 同理，基于此方式，我们也可以检测一个字典是否包含指定的多个 key。 data = { \"name\": \"satori\", \"age\": 17, \"gender\": \"female\"\n} # 判断字典是否包含 name、age、gender 三个 key\nprint( data.keys() >= {\"name\", \"age\", \"gender\"}\n) # True # 字典的 keys 方法会返回一个 dict_keys 对象\n# 该对象具备集合的性质，可以直接和集合进行运算 显然对于这种需求，有了集合就方便多了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的使用场景","id":"204","title":"集合的使用场景"},"205":{"body":"然后我们来罗列一下集合支持的 API，在使用集合的时候要做到心中有数。 # 如果是创建一个空集合，那么要使用 set()\n# 写成 {} 的话，解释器会认为这是一个空字典\ns = {1, 2, 3} # 添加元素，时间复杂度是 O(1)\ns.add(4)\nprint(s) # {1, 2, 3, 4} # 删除指定的元素，如果元素不存在，会抛出 KeyError\n# 时间复杂度为 O(1)\ns.remove(2)\nprint(s) # {1, 3, 4} # 删除指定的元素，如果元素不存在则什么也不做\n# 时间复杂度为 O(1)\ns.discard(666)\nprint(s) # {1, 3, 4} # 随机弹出一个元素并返回，如果集合为空，会抛出 KeyError\n# 时间复杂度为 O(1)\nprint(s.pop()) # 1\nprint(s) # {3, 4} # 清空一个集合\ns.clear()\nprint(s) # set() # 还有一些 API，但我们更推荐使用操作符的方式\n# 两个集合取交集\nprint({1, 2} & {2, 3}) # {2} # 两个集合取并集\nprint({1, 2} | {2, 3}) # {1, 2, 3} # 两个集合取差集\n# s1 - s2，返回在 s1、但不在 s2 当中的元素\nprint({1, 2, 3} - {2, 3, 4}) # {1} # 两个集合取对称差集\n# s1 ^ s2，返回既不在 s1、也不在 s2 当中的元素\nprint({1, 2, 3} ^ {2, 3, 4}) # {1, 4} # 判断两个集合是否相等，也就是内部的元素是否完全一致\n# 顺序无所谓，只比较元素是否全部相同\nprint({1, 2, 3} == {3, 2, 1}) # True\nprint({1, 2, 3} == {1, 2, 4}) # False # 判断一个集合是否包含另一个集合的所有元素\n# 假设有两个集合 s1 和 s2：\n# 如果 s1 的元素都在 s2 中，那么 s2 >= s1；\n# 如果 s2 的元素都在 s1 中，那么 s1 >= s2；\n# 如果 s1 和元素和 s2 全部相同，那么 s1 == s2；\nprint({1, 2, 3} > {1, 2}) # True\nprint({1, 2, 3} >= {1, 2, 3}) # True 以上就是集合支持的一些 API，还是很简单的。","breadcrumbs":"48. 解密集合的实现原理 » 集合的 API","id":"205","title":"集合的 API"},"206":{"body":"集合和字典的内部都使用了哈希表，但字典的哈希表采用两个数组实现，而集合的哈希表采用一个数组实现。因此对于集合来说，这个数组不仅要存储 entry，并且映射出的索引也是该数组的索引。 下面看一下集合的底层结构长什么样子。 // Include/setobject.h typedef struct { // 定长对象的头部信息，但集合显然是一个变长对象 // 所以和字典一样，肯定有其它字段充当 ob_size PyObject_HEAD // Active 态的 entry 数量加上 Dummy 态的 entry 数量 // 一个 entry 就是哈希表里的一个元素，类型为 setentry // 因此在集合里面，一个 entry 就是一个 setentry 结构体实例 // 当删除集合的 entry 时，也必须是伪删除，因为要保证探测链不断裂 // 如果 entry 被伪删除了，那么它便处于 Dummy 态 Py_ssize_t fill; // Active 态的 entry 数量，显然这个 used 充当了 ob_size，也就是集合的元素个数 Py_ssize_t used; // 在看字典源码的时候，我们也见到了 mask，它用于和哈希值进行按位与、计算索引 // 并且这个 mask 等于哈希表的容量减 1，为什么呢？ // 假设哈希值等于 v，哈希表容量是 n，那么通过 v 对 n 取模即可得到一个位于 0 到 n-1 之间的数 // 然而取模运算的效率不高，应该使用 v&(n-1)，它的作用等价于 v%n，并且速度更快 // 但是注意，只有在 n 为 2 的幂次方的时候，v&(n-1) 和 v%n 才是完全等价的 // 所以哈希表的容量要求是 2 的幂次方，就是为了将取模运算优化成按位与运算 Py_ssize_t mask; // 指向 setentry 数组首元素的指针 // 这个 setentry 数组可以是下面的 smalltable，也可以是单独申请的一块内存 setentry *table; // 集合的哈希值，只适用于不可变集合 Py_hash_t hash; // 用于 pop 方法 Py_ssize_t finger; // 一个 setentry 类型的数组，集合的元素就存在里面，但记得我们前面说过 // 变长对象的内部不会存储具体的元素，而是会存储一个指针，该指针指向的内存区域才是用来存储具体元素的 // 这样当扩容的时候，只需要让指针指向新的内存区域即可，从而方便维护 // 没错，对于集合而言，只有在容量不超过 8 的时候，元素才会存在里面 // 而一旦超过了 8，那么会使用 malloc 单独申请内存 setentry smalltable[PySet_MINSIZE]; // 弱引用列表，不做深入讨论 PyObject *weakreflist;\n} PySetObject; 有了字典的经验，再看集合会简单很多。然后是 setentry，用于承载集合内的元素，那么它的结构长什么样呢？相信你能够猜到。 // Include/setobject.h typedef struct { PyObject *key; Py_hash_t hash;\n} setentry; 相比字典少了一个 value，这是显而易见的。 因此集合的结构很清晰了，假设有一个集合 {3.14, \"abc\", 666}，那么它的结构如下： 由于集合里面只有三个元素，所以它们都会存在 smalltable 数组里面，我们通过 ctypes 来证明这一点。 from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {3.14, \"abc\", 666}\n# 先来打印一下哈希值\nprint('hash(3.14) =', hash(3.14))\nprint('hash(\"abc\") =', hash(\"abc\"))\nprint('hash(666) =', hash(666))\n\"\"\"\nhash(3.14) = 322818021289917443\nhash(\"abc\") = 2548892134347232650\nhash(666) = 666\n\"\"\" # 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 0\n2 666\n3 322818021289917443\n4 0\n5 0\n6 2548892134347232650\n7 0\n\"\"\" 根据输出的哈希值我们可以断定，这三个元素确实存在了 smalltable 数组里面，并且 666 存在了数组索引为 2 的位置、3.14 存在了数组索引为 3 的位置、\"abc\" 存在了数组索引为 6 的位置。 当然，由于哈希值是随机的，所以每次执行之后打印的结果都可能不一样，但是整数除外，它的哈希值就是它本身。既然哈希值不一样，那么每次映射出的索引也可能不同，但总之这三个元素是存在 smalltable 数组里面的。 然后我们再考察一下其它字段： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\n# 集合里面有 3 个元素，所以 fill 和 used 都是 3\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 3 # 将集合元素全部删除\n# 这里不能用 s.clear()，原因一会儿说\nfor _ in range(len(s)): s.pop() # 我们知道哈希表在删除元素的时候是伪删除\n# 所以 fill 不变，但是 used 每次会减 1\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 0 fill 字段维护的是 Active 态的 entry 数量加上 Dummy 态的 entry 数量，所以删除元素时它的大小是不变的。但 used 字段的值每次会减 1，因为它维护的是 Active 态的 entry 的数量。所以在不涉及元素的删除时，这两者的大小是相等的。 另外我们说上面不能用 s.clear()，因为该方法表示清空集合，此时会重置为初始状态，然后 fill 和 used 都会是 0，这样就观察不到想要的现象了。 删除集合所有元素之后，我们再往里面添加元素，看看是什么效果： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\nfor _ in range(len(s)): s.pop() # 添加一个元素\ns.add(0)\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 1 多次执行的话，会发现打印的结果可能是 3、1，也有可能是 4、1。至于原因，有了字典的经验，相信你肯定能猜到。 首先添加元素之后，used 肯定为 1。至于 fill，如果添加元素的时候，正好撞上了一个 Dummy 态的 entry，那么将其替换掉，此时 fill 不变，仍然是 3。但如果没有撞上 Dummy 态的 entry，而是添加在了新的位置，那么 fill 就是 4。 for i in range(1, 10): s.add(i)\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 10\ns.pop()\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 9 在之前代码的基础上，继续添加 9 个元素，然后 used 变成了 10，这很好理解，因为此时集合有 10 个元素。但 fill 也是 10，这是为什么？很简单，因为哈希表扩容了，扩容时会删除 Dummy 态的 entry，所以 fill 和 used 是相等的。同理，如果再继续 pop，那么 fill 和 used 就又变得不相等了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的底层结构","id":"206","title":"集合的底层结构"},"207":{"body":"集合的结构我们已经清楚了，再来看看它的初始化过程。我们调用类 set，传入一个可迭代对象，便可创建一个集合，这个过程是怎样的呢？ // Objects/setobject.c\nPyObject *\nPySet_New(PyObject *iterable)\n{ return make_new_set(&PySet_Type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为 PySetObject 申请内存，初始容量为 8 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 对字段做初始化 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; // 哈希表容量为 8 时，元素会存在 smalltable 里面 // 因此直接将 smalltable 赋值给 table so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 遍历 iterable，将迭代出的元素添加到集合中 // 关于这个函数，我们之后再介绍 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} 可以看到，集合的创建过程非常简单。","breadcrumbs":"48. 解密集合的实现原理 » 集合的创建","id":"207","title":"集合的创建"},"208":{"body":"字典和集合都是采用哈希表实现的，但字典的哈希表使用了两个数组，而集合的哈希表使用了一个数组，我们对比一下两者的差异。 假设有一个字典和一个集合，字典包含三个键值对，分别是 \"a\": 1、\"b\": 2、\"c\": 3，集合包含三个元素，分别是 \"a\"、\"b\"、\"c\"，然后映射出的索引分别是 2、5、3。 注：为了方便，这里的图画得没有那么严谨。比如集合的哈希表，里面的元素直接用字符串代替了，但其实它存储的是 setentry entry，而 entry 的 key 字段指向的才是字符串。当然这里我们心里清楚就好。 在介绍字典的时候我们说过，早期的字典内部的哈希表也是使用一个数组实现，除了 entry 会多存储一个 value 之外，其它和当前的集合是类似的。 但如果只使用一个数组实现，会导致内存浪费严重，因为哈希表必须要保证一定的稀疏性。所以后续字典内部的哈希表采用两个数组实现，将存储键值对的数组的长度压缩到原来的 2/3，至于映射出的索引则由另一个数组（哈希索引数组）来承载。虽然引入新的数组会带来额外的内存开销（假设大小为 m 字节），但存储键值对的数组不用再浪费 1/3 的空间（假设大小为 n 字节），只要 m 小于 n，那么使用两个数组就会更加节省内存。而在介绍字典的时候我们也看到了，m 是远小于 n 的。 那么问题来了，为什么集合不使用两个数组呢？很简单，因为使用一个数组实现哈希表会更简单，虽然也更加浪费内存。而集合和字典在哈希表的实现上之所以区别对待，还是使用频率的问题，解释器内部极度依赖字典，比如全局变量就是使用字典存储的。 可以说字典的效率高度影响着整个解释器的效率，字典的内存大小高度影响着解释器的内存占用。因此 Python 除了优化字典的搜索性能之外，还要尽可能地减少字典的内存大小。所以字典搞出了分离表、结合表，这一切操作都是为了将字典的内存占用降到最低。 至于集合，解释器对它的依赖就很小了，所以内部的哈希表，只采用了一个数组实现。虽然会有内存浪费，但无伤大雅。 好，回到上面的例子，如果将字典的键值对 \"b\": 2 和集合的元素 \"b\" 删掉，那么它们的结构会发生什么变化呢？ \"b\" 映射出的索引为 5，因此对于字典来说，会将索引为 5 的哈希槽存储的值设置为 dummy。然后是键值对数组，会将指定的 entry 的 me_key 和 me_value 字段全部设置为 NULL，相当于回归到了初始状态。 需要注意的是，数组一旦申请，那么 entry 的空间就已经有了，只是 me_key 和 me_value 字段均为 NULL。而所谓添加键值对，本质上也是修改指定 entry 的 me_key 和 me_value 字段。 对于集合来说，它只有一个数组，这个数组不仅要存储键值对，它的索引还表示 key 映射出的索引，当然这里的 key 指的就是集合的元素。\"b\" 映射出的索引为 5，所以将数组中索引为 5 的 entry->key 设置为 dummy。 但要注意的是，字典的 dummy 是一个整数，值为 -2（DKIX_DUMMY），因为哈希索引数组存储的是键值对数组的索引，显然这是一个整数。然后 key 映射出的索引是哈希索引数组的索引，如果对应的哈希槽存储的值是 -2，说明当前搜索的 key 对应的 entry 被删除了，应该继续向后搜索。 而集合的 dummy 是一个结构体指针，定义如下： // Objects/setobject.c\nstatic PyObject _dummy_struct;\n#define dummy (&_dummy_struct) 因为集合内部的哈希表只使用了一个数组，该数组存储的是 setentry。如果在查找的时候，发现对应的 entry 的 key 等于 dummy，就知道该 entry 被删除了，应该继续向后搜索。 好，继续回到上面的例子，假设这时候再给字典添加一个键值对 \"d\": 4，给集合添加一个元素 \"d\"，而字符串 \"d\" 映射出的索引也是 5，那么结构是怎样的呢？ 对于字典来说，键值对始终按照先来后到的顺序添加在键值对数组中，然后将它在键值对数组中的索引保存在指定的哈希槽中。由于索引为 5 的哈希槽保存的是 -2，处于 Dummy 态，因此直接将它设置为 3。 同理对于集合来说也是类似的。数组索引为 5 的位置保存的值等于 dummy，处于 Dummy 态，说明该元素被删除了，那么直接替换掉。因此整个过程的逻辑很简单：由于索引会存在冲突，所以元素删除之后，需要写入一个特殊的墓碑值，也就是这里的 dummy，因为要保证探测链不断裂。但如果集合后续添加元素时，正好撞上了一个 Dummy 态的 entry，那么会直接替换掉。 所以不论是字典还是集合，只要处于 Dummy 态，都可以替换掉。因为 Dummy 态存在的目的就是为了保证探测链不断裂，而替换之后探测链依旧是完整的。","breadcrumbs":"48. 解密集合的实现原理 » 字典和集合的哈希表的差异","id":"208","title":"字典和集合的哈希表的差异"},"209":{"body":"以上我们就剖析了集合的底层结构以及它的创建过程，不难发现集合的实现比字典要简单很多，并且集合没有自己的缓存池。 下一篇文章来介绍集合的相关操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"48. 解密集合的实现原理 » 小结","id":"209","title":"小结"},"21":{"body":"type 和 object 两者的关系估计会让很多人感到困惑，我们说 type 站在类型金字塔的顶端，任何对象按照类型追根溯源，最终得到的都是 type。而 object 站在继承金字塔的顶端，任何类型对象按照继承关系追根溯源，最终得到的都是 object。 因此我们可以得出以下结论： type 的父类是 object object 的类型是 type 验证一下： print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 打印结果说明结论正确，但这就奇怪了，type 的父类是 object，而 object 的类型又是 type，那么问题来了，是先有 type 还是先有 object 呢？带着这些疑问，开始下面的内容。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 楔子","id":"21","title":"楔子"},"210":{"body":"本篇文章来聊一聊集合支持的操作，比如元素的添加、删除，以及集合的扩容等等。并且集合还支持交集、并集、差集等运算，它们又是如何实现的呢？下面就一起来看一看。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 楔子","id":"210","title":"楔子"},"211":{"body":"调用 add 方法可以向集合添加一个元素，在底层会执行 set_add 函数。 // Objects/setobject.c\nstatic PyObject *\nset_add(PySetObject *so, PyObject *key)\n{ // 调用了 set_add_key 函数 if (set_add_key(so, key)) return NULL; // 返回 None Py_RETURN_NONE;\n} static int\nset_add_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值，由于字符串内部会缓存自身的哈希值，因此需要判断一下 // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1（尚未计算过） // 那么计算哈希值，但如果计算之后的结果是 -1，说明对象不支持哈希 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_add_entry return set_add_entry(so, key, hash);\n} 假设有一个集合 so，那么 so.add(\"abc\") 最终等价于 set_add_entry(so, \"abc\", hash(\"abc\"))，所以核心逻辑位于 set_add_entry 里面，看一下它的实现，代码比较长。 // Objects/setobject.c\nstatic int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *freeslot; setentry *entry; size_t perturb; size_t mask; size_t i; size_t j; int cmp; // 增加 key 的引用计数，当然这里的 key 指的就是集合的元素 Py_INCREF(key); restart: // mask 等于哈希表的容量减 1 mask = so->mask; // 和字典一样，让 hash & mask 计算出一个索引 i = (size_t)hash & mask; // 获取对应的 entry，里面包含了元素 key 和哈希值 // 如果 key == NULL，说明该位置还没有存储元素 // 此时就找到了合适的位置，跳转到 found_unused 标签 entry = &so->table[i]; if (entry->key == NULL) goto found_unused; freeslot = NULL; // perturb 初始等于哈希值 perturb = hash; while (1) { // 到这里说明指定的位置已经存储了元素，那么判断哈希值是否相同 // 如果哈希值不同，那么 key 一定不相同 // 如果哈希值相同，那么 key 不一定相同 if (entry->hash == hash) { // 所以当哈希值相等时，还要比较新添加的 key 和已存在的 key 是否相同 PyObject *startkey = entry->key; assert(startkey != dummy); 、// 这里的 startkey 和 key 都是 C 的变量，它们都是指针 // 如果两者相等，说明指向的是同一个对象，那么直接判定为相等，于是跳转到 found_active 标签 if (startkey == key) // 相当于 Python 的 is goto found_active; // 如果 startkey 和 key 不等，说明指向的不是同一个对象 // 那么比较值是否相等，相当于 Python 的 == // 这里是针对字符串的一个快分支 if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); // 如果 key 不是字符串，则执行通用比较逻辑 cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); // cmp > 0，说明结果为真，即两个 key 的值相等 // 跳转到 found_active 标签 if (cmp > 0) goto found_active; // cmp < 0 表示执行比较操作时出现错误，基本不会发生 if (cmp < 0) goto comparison_error; // 到这里说明两个 key 虽然映射出的索引是一样的，但它们的值不相等 // 那么要怎么办呢？显然要看下一个 entry 是否可用 // 然后下面这三行代码估计让人有些费解，所做的事情如下 // 如果在查询的过程中，哈希表扩容了，或者 key 发生了改变，那么跳转到 restart 标签重新执行 // 但因为 GIL 的存在，实际不会发生 if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } /* 如果是 Unused 态的 entry，那么 * entry->key == NULL * entry->hash == 0 * * 如果是 Dummy 态的 entry，那么 * entry->key == dummy * entry->hash == -1 * * 如果是 Active 态的 entry，那么 * entry->key == some key * entry->hash == some hash */ // 说明 entry 处于 dummy 态，将它赋值给 freeslot else if (entry->hash == -1) freeslot = entry; // 关于这一步是做什么的，一会儿解释 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // 到这里说明 (&so->table[i])->key 和添加的 key 不相等，即出现了索引冲突 // 那么要改变规则，重新映射，直到映射出一个可用的位置 perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) goto found_unused_or_dummy; } found_unused_or_dummy: // 如果 freeslot == NULL，说明没有撞上 Dummy 态的 entry // 跳转到 found_unused 标签 if (freeslot == NULL) goto found_unused; // 否则说明撞上了 Dummy 态的 entry // 集合的长度加 1，或者说 Active 态的 entry 个数加 1 so->used++; // 更新 key 和 hash freeslot->key = key; freeslot->hash = hash; return 0; found_unused: // 执行到这里，说明找到了新的可用位置 // 那么不光 used 要加 1，fill 也要加 1 so->fill++; so->used++; // 更新 key 和 hash entry->key = key; entry->hash = hash; // 如果哈希表的 entry 的个数（Active 态 + Dummy 态）没超过 mask * 3 / 5 // 那么目前的容量是合理的，直接返回 if ((size_t)so->fill*5 < mask*3) return 0; // 否则进行扩容，因为扩容的时候会丢弃 Dummy 的 entry // 所以扩容之后的容量取决于 used，而不是 fill // 如果 used 大于 50000，那么 2 倍扩容，否则 4 倍扩容 return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4); found_active: // 执行到这里，说明添加的元素已经存在了 // 那么减少 key 的引用计数，然后返回 Py_DECREF(key); return 0; comparison_error: // 执行比较操作时出现错误，应该抛出异常，但这一步基本不会发生 Py_DECREF(key); return -1;\n} 所以整个过程和字典是类似的，依旧是将哈希值和 mask 按位与，得到索引，通过索引找到对应的 entry。接下来对 entry 分情况讨论。 如果 entry->key == NULL。 说明找到了可用的 entry，那么直接跳转到 found_unused 标签，然后修改 entry 的 key 和 hash 字段，这样新元素就添加成功了。 如果 entry->hash == hash。 说明找到的 entry 处于 Active 态，那么比较两个 key 是否相等。如果相等，证明添加的元素已存在，则不插入，直接减少引用计数，因为不是字典，不存在更新一说。但如果两个 key 不相等，说明出现索引冲突，那么要映射出一个新的索引，并且映射的方式和字典也是一样的。 perturb >>= PERTURB_SHIFT;\ni = (i * 5 + 1 + perturb) & mask; 但字典和集合有一处不同，就是集合这里多了一个 for 循环。 // Objects/setobject.c\n#define LINEAR_PROBES 9 static int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ // ... while (1) { // ... // 当前映射出的索引为 i，如果 i + 9 没有超过 mask，那么循环 9 次 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // ... } // ...\n} 当映射出的索引相同、但 key 不相同时，说明出现了索引冲突，对于字典来说，会立即重新映射，找到一个新的索引。而集合由于只用一个数组存储，可以有更好的做法。我们知道 CPU 是有缓存的，像 L1 Cache 加载数据会一次性加载 64 字节，称为一个 cache line。所以通过索引遍历包含 16 个 int32 的数组，每次 i++ 和每次 i += 4 的耗时是差不多的。 对于集合来说，因为映射出的索引是随机的，使得对应的 entry 可能不在 cache 中，从而导致 CPU 下一次要重新读取。所以 Python 引入了 LINEAR_PROBES，从当前的 entry 开始，向后查找 9 个 entry。如果还找不到可用位置，然后才重新计算，从而提高 cache 的稳定性。 如果 entry->hash == -1，或者说 entry->key == dummy。 说明撞上了一个 Dummy 态的 entry，但估计有人又注意到了一个问题。 就是在发现 Dummy 态的 entry 之后，为啥没有立即跳转到 found_unused_or_dummy 标签，而是要继续循环呢？ 很简单，我们假设在发现 Dummy 态的 entry 之后立即跳转，看看会有什么后果。首先向集合添加一个元素 x，再添加一个元素 y，但 y 和 x 映射出的索引相同，那么在添加 y 的时候，会形成一条探测链，对应的元素就是 x->y。然后再将 x 删除，那么 x->y 就变成了 dummy->y。这时候如果再重新添加一个元素 y，那么肯定会撞上 Dummy 态的 entry，于是 dummy->y 就变成了 y->y。 所以当发现 Dummy 态的 entry 之后，如果立即跳转，就会无法消除集合的重复元素。因此正确的做法是先用变量保存起来，这里赋值给了 freeslot，然后继续查找。如果找到了相同的元素，那么就不添加了，因为集合中的元素是唯一的。但如果最后找到的 entry 的 key 为空，说明元素不存在，此时才能跳转到 found_unused_or_dummy 标签，然后对 freeslot 进行判断。如果不为空，说明撞上了 Dummy 态的 entry，那么直接复用该 entry 即可。 以上就是集合添加元素的过程，当然如果找到的是 Unused 态的 entry，还要判断容量的问题。如果 Active 态 + Dummy 态的 entry 个数不小于 3/5*mask，那么扩容，扩容的规则是判断 Active 态的 entry 个数是否大于 50000，是的话就 2 倍扩容，否则 4 倍扩容；","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » add 方法：添加元素","id":"211","title":"add 方法：添加元素"},"212":{"body":"调用 pop 方法，可以从集合中弹出一个元素，在底层会执行 set_pop 方法。 // Objects/setobject.c static PyObject *\nset_pop(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ // so->table 是指向 entry 数组首元素的指针 // so->finger 是做什么的，稍后解释，总之它是一个整数 // so->mask 等于 entry 数组的长度减 1，用于将取模运算优化成按位与运算 // 因此 so->finger & so->mask 会得到一个 0 ~ mask 之间的整数，我们记为 n // 显然这里的变量 entry 会指向 entry 数组中索引 n 的元素 setentry *entry = so->table + (so->finger & so->mask); // 变量 limit 则指向 entry 数组中最后一个元素（索引为 mask） setentry *limit = so->table + so->mask; PyObject *key; // 如果集合长度为 0，那么 pop 方法会抛出 KeyError if (so->used == 0) { PyErr_SetString(PyExc_KeyError, \"pop from an empty set\"); return NULL; } // entry 有三种状态，但显然弹出的 entry 一定是 Active 态 // 所以如果 entry 处于 Unused 或 Dummy 态，直接下一轮循环 while (entry->key == NULL || entry->key==dummy) { entry++; // 我们记 so->finger & so->mask 的结果为 n // 所以相当于从 entry 数组中索引为 n 的位置开始遍历 // 如果遍历到最后一个位置，也没找到 Active 态的 entry，那么从头开始遍历 if (entry > limit) entry = so->table; // 让变量 entry 指向 entry 数组的首元素 // 所以不难发现，整个过程是先遍历 entry 数组中 [n: limit] 的部分 // 如果没有找到 Active 态 entry，那么将 entry 重置为 so->table，从头开始遍历 // 因为执行到这里，说明 so->used 大于 0，即集合的长度大于 0 // 那么当 entry > limit 时，在 entry 数组 [0: n] 的部分，一定存在 Active 态的 entry } // pop 方法会返回弹出的元素，所以获取 entry->key key = entry->key; // 元素被弹出了，对应的 entry 要进行伪删除，所谓的伪删除就是设置一个特殊的墓碑值 // 所以将 entry->key 设置为 dummy，将 entry->hash 设置为 -1 entry->key = dummy; entry->hash = -1; // 集合的长度减 1 so->used--; // 将 finger 更新为被删除的 entry 在 entry 数组中的索引加 1 so->finger = entry - so->table + 1; /* next place to start */ return key;\n} 所以删除的过程还是很简单的，如果不考虑 finger 字段，你就可以简单理解为遍历整个 entry 数组，找到 Active 态的 entry，然后删除即可。只是这么做会导致每次 pop 时，都要重头开始遍历数组。 而当引入了 finger 字段之后，由于该字段初始为 0，所以第一次 pop 时，会从数组的头部开始遍历。假设删除的是数组中索引为 n 的 entry，那么删除之后 finger 字段会被赋值为 n + 1，那么下一次 pop 就会从数组中索引为 n + 1 的 entry 开始遍历。 我们通过 ctypes 来验证这一点： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {11, 22, 33, 44}\n# 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\n# 对于整数来说，它的哈希值等于自身\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 33\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# finger 初始为 0，因此在 pop 元素的时候会从头开始遍历数组\n# 找到第一个 Active 态的 entry\nprint(py_set_obj.finger)\n\"\"\"\n0\n\"\"\" # 显然第一次 pop 出的元素是 33\nprint(s.pop())\n\"\"\"\n33\n\"\"\"\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 -1\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# 因为被伪删除了\n# 所以索引为 1 的 entry->key 会被设置为 NULL，entry->hash 被设置为 -1\n# 至于 finger 则等于 1 + 1，下一次 pop 时，会从索引为 2 的位置开始遍历\nprint(py_set_obj.finger)\n\"\"\"\n2\n\"\"\" # 那么同理，再次 pop 的时候，会弹出 11，然后 finger 变为 3 + 1 = 4\nprint(s.pop())\n\"\"\"\n11\n\"\"\"\nprint(py_set_obj.finger)\n\"\"\"\n4\n\"\"\" 以上就是 finger 字段的作用，它避免了每次都要从头遍历 entry 数组。从这里也不难发现，当一个集合不断执行 pop 方法，将所有元素依次弹出时，这些元素的顺序和直接遍历 entry 数组拿到的元素的顺序是一致的。 item1 = 22333\nitem2 = 177\nitem3 = 520\nitem4 = 10086\n# 将它们映射成索引，由于是 4 个元素，因此哈希表容量为 8\nindex1 = item1 & 7\nindex2 = item2 & 7\nindex3 = item3 & 7\nindex4 = item4 & 7\nprint(index1, index2, index3, index4)\n\"\"\"\n5 1 0 6\n\"\"\"\n# 所以如果将 item1、item2、item3、item4 放到集合中\n# 不管怎么排列，最终都是下面这个结果\n# item3 会位于 entry 数组中索引为 0 的位置\n# item2 会位于 entry 数组中索引为 1 的位置\n# item1 会位于 entry 数组中索引为 5 的位置\n# item4 会位于 entry 数组中索引为 6 的位置 # 所以不管是弹出元素，还是遍历元素，亦或是直接打印集合\n# 元素顺序一定是 item3、item2、item1、item4\ns1 = {item1, item2, item3, item4}\ns2 = {item2, item1, item4, item3}\ns3 = {item3, item1, item2, item4}\ns4 = {item4, item3, item2, item1}\nprint(s1) # {520, 177, 22333, 10086}\nprint(s2) # {520, 177, 22333, 10086}\nprint(s3) # {520, 177, 22333, 10086}\nprint(s4) # {520, 177, 22333, 10086}\nprint( item3, item2, item1, item4\n) # 520 177 22333 10086 怎么样，是不是对集合又有了更深刻的认识了呢？","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » pop 方法：弹出元素","id":"212","title":"pop 方法：弹出元素"},"213":{"body":"remove 方法可以接收参数，删除集合中指定的元素。除了 remove，还有一个 discard 方法，这两个方法的作用一模一样，都是用来删除指定元素。区别就是当删除的元素不存在时，remove 方法会抛出 KeyError，而 discard 方法不会。 remove 方法在底层对应 set_remove 函数，discard 方法在底层对应 set_discard 函数，而 set_remove 函数只比 set_discard 函数多了一个 if 判断，我们来看一下。 以上是 set_remove 函数，注意图中绿色方框的部分，如果要删除的元素不存在，那么 rv 会等于 DISCARD_NOTFOUND，于是抛出 KeyError。 如果将绿色方框里的 if 逻辑删掉，得到的就是 set_discard 函数的源码。所以这两个函数做的事情是一样的，区别就是 set_remove 会多做一层检测，当删除的元素不存在时，set_remove 会主动抛出一个 KeyError，而 set_discard 函数则什么也不做。 所以这里我们只看 set_remove 函数即可。 // Objects/setobject.c #define DISCARD_NOTFOUND 0\n#define DISCARD_FOUND 1 static PyObject *\nset_remove(PySetObject *so, PyObject *key)\n{ // 要删除的 key，或者说元素 // 当然啦，从 C 的层面来看，删除 key 其实就是删除数组中该 key 对应的 entry // 只不过这个删除是伪删除，即写入一个特殊的墓碑值 PyObject *tmpkey; int rv; // rv 表示删除结果，显然删除逻辑由 set_discard_key 函数实现 // 如果 rv < 0，表示删除元素时出现错误，比如传入了一个不可哈希的对象 // 如果 rv == 0，表示要删除的元素在集合中不存在 // 如果 rv == 1，表示成功将元素从集合中删除 rv = set_discard_key(so, key); if (rv < 0) { // 当传入一个不可哈希对象时，会抛出 TypeError // 我们知道集合也是不可哈希的，但如果要删除的 key 是集合类型 // 那么解释器会额外做一个兜底操作，我们一会儿通过 Python 代码演示 if (!PySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError)) return NULL; // 将回溯栈里的异常清空 PyErr_Clear(); // 基于集合里的元素创建不可变集合 tmpkey = make_new_set(&PyFrozenSet_Type, key); if (tmpkey == NULL) return NULL; // 然后尝试删除这个不可变集合，如果还删除失败，则报错 rv = set_discard_key(so, tmpkey); Py_DECREF(tmpkey); if (rv < 0) return NULL; } // 如果 rv == DISCARD_NOTFOUND，表示要删除的元素不存在 if (rv == DISCARD_NOTFOUND) { _PyErr_SetKeyError(key); // 抛出 KeyError return NULL; } Py_RETURN_NONE;\n} 我们看到当元素删除失败时，如果 key 是集合类型，那么解释器会做一个兜底操作，这是什么意思呢？我们演示一遍。 try: s = {[1, 2, 3]} # 列表不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" try: s = {{1, 2, 3}} # 同样，集合也不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'set'\n\"\"\" # 当我们尝试 remove 列表时，依旧会抛出相同的错误\ns = {1, 2, 3}\ntry: s.remove([])\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" # 但 remove 一个集合就不同了\ns = { frozenset({1, 2, 3}), frozenset({4, 5, 6}),\n}\n# 不可变集合是可哈希对象，因此它可以放在集合中，也可以被删除\ns.remove(frozenset({1, 2, 3}))\n# 但删除可变集合理论上应该和删除列表一样，抛出 TypeError: unhashable type: 'set'\n# 而事实上异常也确实产生了，保存在回溯栈中，但是从源码中我们看到，解释器会多做一个检测\n# 如果删除的 key 是集合类型，并且栈里的异常是 TypeError，那么将异常清空\n# 然后基于集合创建不可变集合，并尝试删除这个不可变集合\ns.remove({4, 5, 6})\n# 所以这里 s.remove({4, 5, 6}) 等价于 s.remove(frozenset({4, 5, 6}))\nprint(s)\n\"\"\"\nset()\n\"\"\"\n# 我们看到 s 里面的两个不可变集合被删除了 好，我们回到 set_remove 函数，它在删除元素时会调用 set_discard_key 函数，显然删除指定元素的核心逻辑位于此函数中，我们看一下它做了什么。 // Objects/setobject.c static int\nset_discard_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_discard_entry 函数 // 传入三个参数：集合、要删除的 key、以及 key 的哈希值 return set_discard_entry(so, key, hash);\n} static int\nset_discard_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; PyObject *old_key; // 将 key 映射成索引，并获取该索引对应的 entry 的指针 entry = set_lookkey(so, key, hash); // 因为 entry 数组申请好之后，内部的每个 entry 都拥有一块合法的内存 // 所以指针不可能为 NULL，如果为 NULL，证明内部出问题了 if (entry == NULL) // 基本不会发生 return -1; // 如果 entry->key 为 NULL，证明要删除的 key 不存在，返回 DISCARD_NOTFOUND // 当 set_remove 函数发现返回的是 DISCARD_NOTFOUND，会抛出 KeyError if (entry->key == NULL) return DISCARD_NOTFOUND; // 否则说明 key 存在 old_key = entry->key; // 因为被删除了，所以将 entry->key、entry->hash 设置为 dummy 和 -1 entry->key = dummy; entry->hash = -1; // 集合长度减 1 so->used--; // 减少 key 指向对象的引用计数，因为集合不再持有对它的引用 Py_DECREF(old_key); // 返回 DISCARD_FOUND return DISCARD_FOUND;\n} 以上就是 set_remove 函数删除指定元素的具体细节，逻辑并不复杂。但是里面出现了一个 set_lookkey 函数，它的作用是将哈希值映射成索引，并返回指定的 entry。至于该函数的逻辑也很简单，它和 set_add 函数里面的逻辑是重复的。 static setentry *\nset_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *entry; size_t perturb; size_t mask = so->mask; size_t i = (size_t)hash & mask; /* Unsigned for defined overflow behavior */ size_t j; int cmp; entry = &so->table[i]; if (entry->key == NULL) return entry; perturb = hash; while (1) { if (entry->hash == hash) { PyObject *startkey = entry->key; /* startkey cannot be a dummy because the dummy hash field is -1 */ assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) /* unlikely */ return NULL; if (table != so->table || entry->key != startkey) /* unlikely */ return set_lookkey(so, key, hash); if (cmp > 0) /* likely */ return entry; mask = so->mask; /* help avoid a register spill */ } if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) return entry; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) return NULL; if (table != so->table || entry->key != startkey) return set_lookkey(so, key, hash); if (cmp > 0) return entry; mask = so->mask; } } } perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) return entry; }\n} 显然该函数的逻辑在介绍 set_add 函数的时候就说过了。 如果 entry->key 为空，说明找到了 Unused 态的 entry，即 key 不存在，那么直接将 entry 返回即可。 如果 entry->key 不为空，那么比较 entry->hash 和传入的 hash 是否相等，如果哈希值不相等，那么 key 一定不相等，说明出现了索引冲突。当然啦，如果 entry 处于 Dummy 态，那么哈希值肯定也不相等，但不管哪一种，都要重新映射。 如果哈希值相等，那么比较 key 是否相等，如果 key 相等，说明查找的 key 存在于集合中，那么返回对应的 entry。如果 key 不相等，则重新映射。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » remove 方法：删除指定元素","id":"213","title":"remove 方法：删除指定元素"},"214":{"body":"调用 copy 方法可以拷贝一个集合，在底层会执行 set_copy 方法。 // Objects/setobject.c static PyObject *\nset_copy(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ return make_new_set_basetype(Py_TYPE(so), (PyObject *)so);\n} static PyObject *\nmake_new_set_basetype(PyTypeObject *type, PyObject *iterable)\n{ if (type != &PySet_Type && type != &PyFrozenSet_Type) { if (PyType_IsSubtype(type, &PySet_Type)) type = &PySet_Type; else type = &PyFrozenSet_Type; } return make_new_set(type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为集合申请内存 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 字段初始化，显然刚创建的集合的容量为 8 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 调用 set_update_internal 函数，将可迭代对象的元素添加到集合中 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} static int\nset_update_internal(PySetObject *so, PyObject *other)\n{ // 参数 so 表示集合，other 表示可迭代对象 PyObject *key, *it; // 如果 other 的类型也是集合（或者不可变集合），那么调用 set_merge 函数 if (PyAnySet_Check(other)) return set_merge(so, other); // 否则检测 other 是否为字典 if (PyDict_CheckExact(other)) { PyObject *value; Py_ssize_t pos = 0; Py_hash_t hash; Py_ssize_t dictsize = PyDict_GET_SIZE(other); // 判断 so->fill + dictsize 是否达到了 so->mask 的 3/5 // 如果达到了，那么扩容 if (dictsize < 0) return -1; if ((so->fill + dictsize)*5 >= so->mask*3) { if (set_table_resize(so, (so->used + dictsize)*2) != 0) return -1; } // 遍历字典，将字典的 key 和 hash 包装成 entry，添加到数组中，value 丢弃 // 这里调用的是 set_add_entry 函数，我们介绍集合的 add 方法时说过 while (_PyDict_Next(other, &pos, &key, &value, &hash)) { if (set_add_entry(so, key, hash)) return -1; } return 0; } // 到这里说明 other 不是字典，那么迭代出来的整体就是 key // 基于可迭代对象创建迭代器 it = PyObject_GetIter(other); if (it == NULL) return -1; // 将元素迭代出来 while ((key = PyIter_Next(it)) != NULL) { // 调用 set_add_key 函数，它内部会先计算 key 的哈希值 // 然后调用 set_add_entry 函数，添加元素 if (set_add_key(so, key)) { Py_DECREF(it); Py_DECREF(key); return -1; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) return -1; return 0;\n} 以上就是集合的 copy 方法的底层实现，非常简单。说白了就是先创建一个新的集合，然后调用 set_update_internal 函数将老集合里面的元素拷贝过去。当然啦，该函数可以拷贝任意可迭代对象里的元素，不仅仅是集合。只是当可迭代对象是集合时，会单独调用 set_merge 函数，如果不是集合，那么会直接遍历。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » copy 方法：拷贝一个集合","id":"214","title":"copy 方法：拷贝一个集合"},"215":{"body":"调用 update 方法，可以合并多个可迭代对象，举例说明。 s = {1, 2, 3}\ns.update([4, 5, 6], (7, 8, 9))\nprint(s)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" 相信你已经知道底层是怎么做的了，获取每个可迭代对象，然后调用 set_update_internal 函数即可。那么底层是不是这么做的呢？我们来看一下，update 方法在底层对应 set_update 函数。 // Objects/setobject.c static PyObject *\nset_update(PySetObject *so, PyObject *args)\n{ Py_ssize_t i; for (i=0 ; i<PyTuple_GET_SIZE(args) ; i++) { PyObject *other = PyTuple_GET_ITEM(args, i); if (set_update_internal(so, other)) return NULL; } Py_RETURN_NONE;\n} 跟我们分析的一样，非常简单。 另外集合还有一个 union 方法，功能和 update 方法类似，但它会返回一个新的集合。 s1 = {1, 2, 3}\ns1.update([4, 5, 6], (7, 8, 9))\nprint(s1)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" s2 = {1, 2, 3}\ns2_new = s2.union([4, 5, 6], (7, 8, 9))\nprint(s2)\nprint(s2_new)\n\"\"\"\n{1, 2, 3}\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" update 方法会原地修改，而 union 方法会返回新的集合，不会影响原有的集合。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » update 方法：合并多个可迭代对象","id":"215","title":"update 方法：合并多个可迭代对象"},"216":{"body":"集合还有一些常用的方法，只不过我们更倾向于使用操作符的形式。 s1 & s2：对两个集合做交集运算，返回新的集合，里面包含同时出现在 s1 和 s2 当中的元素； s1 | s2：对两个集合做并集运算，返回新的集合，里面包含出现在 s1 或 s2 当中的元素； s1 - s2：对两个集合做差集运算，返回新的集合，里面包含出现在 s1 当中、但没有出现在 s2 当中的元素； s1 ^ s2：对两个集合做对称差集运算，返回新的集合，里面包含只出现在 s1 当中、或只出现在 s2 当中的元素； s1 == s2：判断两个集合的元素是否完全相同； s1 >= s2：判断 s2 是否是 s1 的子集，如果是，那么 s2 - s1 == {}。 s1 <= s2：判断 s1 是否是 s2 的子集，如果是，那么 s1 - s2 == {}。 s1 > s2：判断 s2 是否是 s1 的真子集； s1 < s2：判断 s1 是否是 s2 的真子集； 注意：在使用这些操作符时，两侧的 s1 和 s2 都要求是集合类型。但如果使用操作符对应的方法，那么则不要求 s2 是集合类型，只要是可迭代对象即可。 # 做交集运算\ns = {\"a\", \"b\", \"c\"}\nprint(s.intersection(\"bcd\"))\n\"\"\"\n{'b', 'c'}\n\"\"\"\n# print(s & \"bcd\") # TypeError 这些方法都非常的有用，可以自己测试一下，加深一遍印象。至于这些方法的底层实现，感兴趣也可以去 Objects/setobject.c 中探索一番，方法都定义在 set_methods 数组中。这里我们就以集合的交集运算为例，看一下实现过程。 // Objects/setobject.c // 判断集合是否包含某个元素\nstatic int\nset_contains_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; // 调用 set_lookkey，返回 entry // 如果 entry->key 不为空，证明元素存在，否则不存在 entry = set_lookkey(so, key, hash); if (entry != NULL) return entry->key != NULL; return -1;\n} // 两个集合做交集运算，返回新的集合\nstatic PyObject *\nset_intersection(PySetObject *so, PyObject *other)\n{ PySetObject *result; PyObject *key, *it, *tmp; Py_hash_t hash; int rv; // 快分支：如果两个集合相等，那么直接把其中一个拷贝一份 if ((PyObject *)so == other) return set_copy(so, NULL); // 否则创建一个新的空集合 result = (PySetObject *)make_new_set_basetype(Py_TYPE(so), NULL); if (result == NULL) return NULL; // 如果 other 是集合 if (PyAnySet_Check(other)) { Py_ssize_t pos = 0; setentry *entry; // 如果 len(other) > len(so)，那么两者交换位置，也就是遍历元素较少的集合 if (PySet_GET_SIZE(other) > PySet_GET_SIZE(so)) { tmp = (PyObject *)so; so = (PySetObject *)other; other = tmp; } // 遍历集合 other while (set_next((PySetObject *)other, &pos, &entry)) { key = entry->key; hash = entry->hash; // 判断 key 是否存在于集合 so 中 rv = set_contains_entry(so, key, hash); if (rv < 0) { Py_DECREF(result); return NULL; } // 如果存在，那么添加到新集合 result 中 if (rv) { if (set_add_entry(result, key, hash)) { Py_DECREF(result); return NULL; } } } return (PyObject *)result; } // 如果 other 不是集合，那么获取它的迭代器 it = PyObject_GetIter(other); if (it == NULL) { Py_DECREF(result); return NULL; } // 直接迭代内部的元素，以下逻辑和上面类似 while ((key = PyIter_Next(it)) != NULL) { hash = PyObject_Hash(key); if (hash == -1) goto error; // 如果 key 在 so 中存在，那么添加到 result 中 rv = set_contains_entry(so, key, hash); if (rv < 0) goto error; if (rv) { if (set_add_entry(result, key, hash)) goto error; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) { Py_DECREF(result); return NULL; } return (PyObject *)result; error: Py_DECREF(it); Py_DECREF(result); Py_DECREF(key); return NULL;\n} 以上就是集合的交集运算，至于其它的运算操作也是类似的，感兴趣可以看一下。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 其它的一些方法","id":"216","title":"其它的一些方法"},"217":{"body":"关于集合相关的内容我们就介绍完了，当然到目前为止，Python 的内置数据结构也基本介绍完了。回顾一下我们介绍了哪些数据结构： 浮点数； 整数； 复数； 布尔值 None； 切片； bytes 对象； bytearray 对象； 字符串； 列表； 元组； 字典； 集合； 以上这些结构都是内置的，当然还有一些数据结构是定义在标准库里面的，我们后面再说。 下一篇文章来介绍迭代器。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 小结","id":"217","title":"小结"},"218":{"body":"只要类型对象实现了 __iter__，那么它的实例对象就被称为可迭代对象（Iterable），比如字符串、元组、列表、字典、集合等等。而整数、浮点数，由于其类型对象没有实现 __iter__，所以它们不是可迭代对象。 from typing import Iterable print( isinstance(\"\", Iterable), isinstance((), Iterable), isinstance([], Iterable), isinstance({}, Iterable), isinstance(set(), Iterable),\n) # True True True True True print( isinstance(0, Iterable), isinstance(0.0, Iterable),\n) # False False 可迭代对象的一大特点是可以被 for 循环遍历，但能被 for 循环遍历的则不一定是可迭代对象。我们举个例子： class A: def __getitem__(self, item): return f\"参数 item: {item}\" a = A()\n# 内部定义了 __getitem__\n# 首先可以让实例对象像字典一样访问属性\nprint(a[\"name\"]) # 参数 item: name\nprint(a[\"satori\"]) # 参数 item: satori # 此外还可以像可迭代对象一样被 for 循环\n# 循环的时候会自动给 item 传值：0 1 2 3 ...\n# 如果内部出现了 StopIteration，循环结束\n# 否则会一直循环下去，这里我们手动 break\nfor idx, val in enumerate(a): print(val) if idx == 5: break\n\"\"\"\n参数 item: 0\n参数 item: 1\n参数 item: 2\n参数 item: 3\n参数 item: 4\n参数 item: 5\n\"\"\" 所以实现了 __getitem__ 的类的实例，也是可以被 for 循环的，但它并不是可迭代对象。 from typing import Iterable\nprint(isinstance(a, Iterable)) # False 总之判断一个对象是否是可迭代对象，就看它的类型对象有没有实现 __iter__。可迭代对象我们知道了，那什么是迭代器呢？很简单，调用可迭代对象的 __iter__ 方法，得到的就是迭代器。","breadcrumbs":"50. 迭代器是怎么实现的？ » 楔子","id":"218","title":"楔子"},"219":{"body":"不同类型的对象，都有自己的迭代器，举个栗子。 data = [1, 2, 3]\n# 底层调用的其实是 list.__iter__(data)\n# 或者说 PyList_Type.tp_iter(data)\nit = data.__iter__()\nprint(it)\n\"\"\"\n<list_iterator object at 0x102c1cf10>\n\"\"\"\nprint(str.__iter__(\"\"))\n\"\"\"\n<str_iterator object at 0x100e623b0>\n\"\"\"\nprint(tuple.__iter__(()))\n\"\"\"\n<tuple_iterator object at 0x100e623b0>\n\"\"\"\n# 不难发现，迭代器的种类非常多\n# 比如 list_iterator、str_iterator、tuple_iterator 等等 迭代器也是可迭代对象，只不过迭代器内部的 __iter__ 返回的还是它本身。当然啦，在创建迭代器的时候，我们更常用内置函数 iter。 data = [1, 2, 3]\n# 等价于 type(data).__iter__(data)\nit = iter(data) 但是 iter 函数还有一个鲜为人知的用法，我们来看一下： val = 0 def foo(): global val val += 1 return val # iter 可以接收一个参数: iter(可迭代对象)\n# iter 也可以接收两个参数: iter(可调用对象, value)\nfor i in iter(foo, 5): print(i)\n\"\"\"\n1\n2\n3\n4\n\"\"\" 进行迭代的时候，会不停地调用可调用对象，直到返回值等于传递的第二个参数 value（在底层被称为哨兵），然后终止迭代。我们看一下 iter 函数的底层实现。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *v; // 内置函数 iter 接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"iter\", nargs, 1, 2)) return NULL; // 如果 nargs 等于 1，那么 args[0] 是可迭代对象 // 如果 nargs 等于 2，那么 args[0] 是可调用对象 v = args[0]; // nargs == 1，说明 v 是可迭代对象 if (nargs == 1) // 调用 PyObject_GetIter 获取对象的迭代器 return PyObject_GetIter(v); // 否则说明 nargs == 2，那么 v 是可调用对象 // 这里进行检测，如果不是，抛出 TypeError if (!PyCallable_Check(v)) { PyErr_SetString(PyExc_TypeError, \"iter(v, w): v must be callable\"); return NULL; } // 获取哨兵 PyObject *sentinel = args[1]; // 一会儿单独解释 return PyCallIter_New(v, sentinel);\n} 以上就是 iter 函数的内部逻辑，既可以接收一个参数，也可以接收两个参数。这里我们只看接收一个可迭代对象的情况，所以核心就在 PyObject_GetIter 函数里面，它是根据可迭代对象生成迭代器的关键，我们来看一下它的逻辑是怎样的？ // Objects/abstract.c\nPyObject *\nPyObject_GetIter(PyObject *o)\n{ // 获取可迭代对象的类型对象，比如 o 是列表，那么 t 就是 list PyTypeObject *t = o->ob_type; // 我们说类型对象定义的操作，决定了实例对象的行为 // 实例对象调用的那些方法都是定义在类型对象里面的 // 还是那句话：obj.func() 等价于 type(obj).func(obj) getiterfunc f; // 所以这里是获取类型对象的 tp_iter 字段 // 也就是 Python 中的 __iter__ f = t->tp_iter; // 如果 f 为 NULL，说明类型对象的内部没有定义 __iter__ // 像 str、tuple、list 等类型对象，它们的 tp_iter 字段都是不为 NULL 的 if (f == NULL) { // 如果 tp_iter 为 NULL，那么解释器会退而求其次 // 检测该类型对象中是否定义了 __getitem__ // 如果定义了，那么直接调用 PySeqIter_New，创建 seqiterobject 对象 // 下面的 PySequence_Check 函数负责检测类型对象是否实现了 __getitem__ // __getitem__ 对应 tp_as_sequence->sq_item if (PySequence_Check(o)) return PySeqIter_New(o); // 走到这里说明该类型对象既没有 __iter__、也没有 __getitem__ // 因此它的实例对象不具备可迭代的性质，于是抛出异常 return type_error(\"'%.200s' object is not iterable\", o); } else { // 否则说明定义了 __iter__ // 调用 o->ob_type->tp_iter(o) 返回对应的迭代器 PyObject *res = (*f)(o); // 但如果返回值 res 不为 NULL、并且还不是迭代器 // 证明 __iter__ 的返回值有问题，于是抛出异常 if (res != NULL && !PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, \"iter() returned non-iterator \" \"of type '%.100s'\", res->ob_type->tp_name); Py_DECREF(res); res = NULL; } // 返回 res return res; }\n} 以上便是 iter 函数的底层实现，还是很简单的。然后是里面的 __getitem__，我们说如果类型对象内部没有定义 __iter__，那么解释器会退而求其次，检测内部是否定义了 __getitem__。 因此以上就是迭代器的创建过程，每个可迭代对象都有自己的迭代器，而迭代器本质上就是对原始数据的一层封装罢了。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的创建","id":"219","title":"迭代器的创建"},"22":{"body":"首先必须要澄清一个事实，类对象的类型是 type，这句话是没有问题的。但如果说类对象都是由 type 创建的，就有些争议了。因为 type 能够创建的是自定义的类，而内置的类在底层是预先定义好的。 # int、tuple、dict 等内置类型\n# 在底层是预先定义好的，以全局变量的形式存在\n# 我们直接就可以拿来用\nprint(int) # <class 'int'>\nprint(tuple) # <class 'tuple'> # 但对于自定义的类，显然就需要在运行时动态创建了\n# 而创建这一过程，就交给 type 来做\nclass Girl: pass 然后 type 也只能对自定义类进行属性上的增删改，内置的类则不行。 class Girl: pass # 给类对象增加一个成员函数\ntype.__setattr__( Girl, \"info\", lambda self: \"name: 古明地觉, age: 17\"\n)\n# 实例化之后就可以调用了\nprint(Girl().info()) # name: 古明地觉, age: 17 # 但内置的类对象，type 是无法修改的\ntry: type.__setattr__(int, \"a\", \"b\")\nexcept TypeError as e: print(e)\n\"\"\"\ncan't set attributes of built-in/extension type 'int'\n\"\"\" 上一篇文章中我们说了，Python 所有的类型对象（包括 type）都是由 PyTypeObject 结构体实例化得到的，只不过结构体字段的值不同，得到的类也不同。并且内置的类型对象在底层是预定义好的，它们在解释器看来是同级别的，不存在谁创建谁。 而每一个对象都有引用计数和类型，然后解释器将这些类对象的类型都设置成了 type，我们举例说明。不过在此之前，需要先说一个宏。 // Include/object.h // _PyObject_EXTRA_INIT 可以忽略掉\n// 我们看到这个宏是用来初始化引用计数和类型的\n#define PyObject_HEAD_INIT(type) \\ { _PyObject_EXTRA_INIT \\ 1, type }, // 负责初始化引用计数、类型和 ob_size\n#define PyVarObject_HEAD_INIT(type, size) \\ { PyObject_HEAD_INIT(type) size }, 下面我们来看几个类型对象。 我们看到所有类型对象的类型都被设置成了 &PyType_Type，也就是 Python 里的 type。所以结论很清晰了，虽然内置的类型对象可以看做是 type 的实例对象，但它却不是由 type 实例化得到的，而是在底层预定义好，并以全局变量的形式静态出现。 所以内置的类型对象之间不存在谁创建谁，它们都是预定义好的，只是在定义的时候，将自身的类型设置成了 type 而已，包括 type 本身（类型还是 type）。这样一来，每一个对象都会有一个类型，从而将面向对象理念贯彻的更加彻底。 print(int.__class__)\nprint(tuple.__class__)\nprint(set.__class__)\nprint(type.__class__)\n\"\"\"\n<class 'type'>\n<class 'type'>\n<class 'type'>\n<class 'type'>\n\"\"\" print( type.__class__.__class__.__class__ is type\n) # True print( type(type(type(type(type(type))))) is type\n) # True 好，说完了这些之后我们来正式考察 type 和 object 的底层实现。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类是由谁创建的","id":"22","title":"类是由谁创建的"},"220":{"body":"由于迭代器的种类非常多，字符串、元组、列表等等，都有自己的迭代器，这里就不一一介绍了。我们就以列表的迭代器为例，看看迭代器在底层的结构是怎么样的。 // Objects/listobject.c // 列表迭代器的类型对象为 <class 'list_iterator'>\n// 但这个类，解释器并没有暴露给我们，所以需要通过 type 获取\n// 然后它的 tp_basicsize 字段为 sizeof(listiterobject)\n// 这就说明列表迭代器在底层由 listiterobject 结构体表示\nPyTypeObject PyListIter_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"list_iterator\", /* tp_name */ sizeof(listiterobject), /* tp_basicsize */ 0, /* tp_itemsize */ // ...\n}; typedef struct { PyObject_HEAD Py_ssize_t it_index; // 指向创建该迭代器的列表 PyListObject *it_seq;\n} listiterobject; 所以迭代器就是基于可迭代对象进行了一层简单的封装，所谓元素迭代本质上还是基于索引，并且每迭代一次，索引就自增 1。一旦出现索引越界，就将 it_seq 设置为 NULL，表示迭代器迭代完毕。 我们实际演示一下： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_size\", c_void_p) ] class ListIterObject(PyObject): _fields_ = [ (\"it_index\", c_ssize_t), (\"it_seq\", POINTER(PyObject)) ] it = iter([1, 2, 3])\nit_obj = ListIterObject.from_address(id(it)) # it_seq 指向列表 [1, 2, 3]，it_index 初始为 0\nprint(it_obj.it_index) # 0\n# 进行迭代\nnext(it)\n# 索引自增 1，此时 it_index 等于 1\nprint(it_obj.it_index) # 1\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 2\nprint(it_obj.it_index) # 2\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 3\nprint(it_obj.it_index) # 3 当 it_index 为 3 的时候，如果再次迭代，那么底层会发现 it_index 已超过最大索引，于是知道迭代器已经迭代完毕了。因此会将 it_seq 设置为 NULL，并抛出 StopIteration。如果是 for 循环，那么会自动捕获此异常，然后停止循环。 所以这就是迭代器，真的没有想象中的那么神秘，甚至在知道它的实现原理之后，还觉得有点 low，因为就是将原始数据包了一层，加了一个索引而已。所谓的迭代仍然是基于索引来做的，并且每迭代一次，索引就自增 1。当索引超出范围时，证明迭代完毕了，于是将 it_seq 字段设置为 NULL，抛出 StopIteration。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的底层结构","id":"220","title":"迭代器的底层结构"},"221":{"body":"迭代器的创建我们知道了，那么它是怎么迭代元素的呢？首先迭代元素可以通过 next 函数，当然它本质上也是调用了对象的 __next__ 方法。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_next(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *it, *res; // 同样接收 1 ~ 2 个参数 // 因为调用 next 函数时，可以传入一个默认值 // 表示当迭代器没有元素可以迭代的时候，会返回指定的默认值 if (!_PyArg_CheckPositional(\"next\", nargs, 1, 2)) return NULL; // 迭代器 it = args[0]; // 类型检测，如果不是迭代器，那么抛出异常 if (!PyIter_Check(it)) { PyErr_Format(PyExc_TypeError, \"'%.200s' object is not an iterator\", it->ob_type->tp_name); return NULL; } // it->ob_type 表示获取类型对象，也就是该迭代器的类型 // 当然具体类型是哪一种并不确定，可能是列表迭代器、元组迭代器、字符串迭代器等等 // 然后再获取 tp_iternext 字段，相当于 __next__ // 拿到函数指针之后，传入迭代器进行调用 res = (*it->ob_type->tp_iternext)(it); // 如果 res 不为 NULL，那么证明迭代到值了，直接返回 if (res != NULL) { return res; } else if (nargs > 1) { // 否则的话，说明没有迭代到值（返回 NULL），而这时候有两种情况 // 1）迭代器已耗尽，2）在迭代过程中出现异常 // 那么判断 nargs 是否大于 1，如果大于 1，说明设置了默认值 PyObject *def = args[1]; // 检测异常是不是迭代完毕时（或者手动 raise）产生的 StopIteration 异常 if (PyErr_Occurred()) { if(!PyErr_ExceptionMatches(PyExc_StopIteration)) // 如果不是，说明程序的逻辑有问题，直接 return NULL，结束执行 // 然后在 Python 里面我们会看到打印到 stderr 中的异常信息 return NULL; // 如果异常是 StopIteration，证明迭代完毕了 // 但我们设置了默认值，那么就应该返回默认值 // 而不应该抛出 StopIteration，于是将异常回溯栈给清空 PyErr_Clear(); } // 增加默认值的引用计数，然后返回 Py_INCREF(def); return def; } else if (PyErr_Occurred()) { // 走到这里说明 res == NULL，并且没有指定默认值 // 那么当发生异常时，将异常直接抛出 return NULL; } else { // 都不是的话，直接抛出 StopIteration PyErr_SetNone(PyExc_StopIteration); return NULL; }\n} 以上就是 next 函数的背后逻辑，实际上还是调用了迭代器的 __next__ 方法。 data = [1, 2, 3]\nit = iter(data)\n# 然后迭代，等价于 next(it)\nprint(type(it).__next__(it)) # 1\nprint(type(it).__next__(it)) # 2\nprint(type(it).__next__(it)) # 3\n# 但是 next 可以指定默认值\n# 如果不指定默认值，或者还是 type(it).__next__(it)\n# 那么就会报错，抛出 StopIteration\nprint(next(it, 666)) # 666 以上就是元素的迭代，由于内置函数 next 还可以指定一个默认值，所以更强大一些。当然在不指定默认值的情况下，next(it) 和 type(it).__next__(it) 最终是殊途同归的。 我们仍以列表的迭代器为例，看看 __next__ 的具体实现。 由于 tp_iternext 字段指向了 listiter_next，证明迭代的时候调用的是这个函数。 // Objects/listobject.c\nstatic PyObject *\nlistiter_next(listiterobject *it)\n{ // 迭代器只是对可迭代对象的一层封装 // 如果是列表的迭代器，那么内部的 it_seq 字段便指向列表 PyListObject *seq; PyObject *item; assert(it != NULL); // 如果 it->it_seq 等于 NULL，说明迭代器已经迭代完毕了 // 从这里也能看出迭代器不能二次循环迭代 seq = it->it_seq; if (seq == NULL) return NULL; assert(PyList_Check(seq)); // 如果 it->it_index 小于列表的长度 if (it->it_index < PyList_GET_SIZE(seq)) { // 那么获取元素 item = PyList_GET_ITEM(seq, it->it_index); // it_index 自增 1 ++it->it_index; // 增加元素的引用计数，并返回 Py_INCREF(item); return item; } // 否则说明 it_index 已经达到了列表的长度 // 再迭代就索引越界了，而对于迭代器来说 // 当 it_index 等于列表长度时，就证明所有元素都迭代完毕了 it->it_seq = NULL; // 将 it_seq 设置为 NULL Py_DECREF(seq); return NULL;\n} 显然这和之前分析的是一样的，以上我们就以列表为例，考察了迭代器的实现原理和元素迭代的具体过程。当然其它对象也有自己的迭代器，有兴趣可以看一看，实现方式都大同小异。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器是怎么迭代元素的","id":"221","title":"迭代器是怎么迭代元素的"},"222":{"body":"前面说了，iter 函数如果接收一个参数，那么这个参数必须是可迭代对象。如果接收两个参数，那么第一个参数要是 callable，第二个参数是哨兵。迭代时会调用 callable，当返回值等于哨兵时，迭代结束，那么它的底层是怎么实现的呢？这里简单补充一下。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // ... PyObject *sentinel = args[1]; // 如果参数个数等于 2，会调用 PyCallIter_New return PyCallIter_New(v, sentinel);\n} // Objects/iterobject.c\ntypedef struct { PyObject_HEAD PyObject *it_callable; PyObject *it_sentinel;\n} calliterobject; PyObject *\nPyCallIter_New(PyObject *callable, PyObject *sentinel)\n{ // iter(callable, value) 会返回一个 <class 'callable_iterator'> 实例 // 在底层由 calliterobject 结构体实现 calliterobject *it; // 为 calliterobject 实例申请内存 it = PyObject_GC_New(calliterobject, &PyCallIter_Type); if (it == NULL) return NULL; // 初始化字段 Py_INCREF(callable); it->it_callable = callable; Py_INCREF(sentinel); it->it_sentinel = sentinel; _PyObject_GC_TRACK(it); return (PyObject *)it;\n} // 再来看看迭代过程\nstatic PyObject *\ncalliter_iternext(calliterobject *it)\n{ PyObject *result; // 如果 it_callable 字段为空，说明迭代结束，不能再次迭代 if (it->it_callable == NULL) { return NULL; } // 调用 it_callable，拿到返回值 result result = _PyObject_CallNoArg(it->it_callable); if (result != NULL) { int ok; // 如果 result 和哨兵相等，那么 ok == 1，否则 ok == 0 ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ); // ok == 0，说明两者不相等，那么返回 result if (ok == 0) { return result; } // ok > 0，说明返回值和哨兵相等，那么迭代结束 // 减少引用计数，并将 it_callable 和 it_sentinel 字段设置为 NULL Py_DECREF(result); if (ok > 0) { Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } } else if (PyErr_ExceptionMatches(PyExc_StopIteration)) { // 如果函数抛出了 StopIteration 异常，同样视为迭代结束 PyErr_Clear(); Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } return NULL;\n} 还是比较简单的，就是不停地调用可迭代对象，当返回值和哨兵相等时，迭代结束。","breadcrumbs":"50. 迭代器是怎么实现的？ » iter 函数接收两个参数","id":"222","title":"iter 函数接收两个参数"},"223":{"body":"通过探究迭代器，我们再次体会到了 Python 的设计哲学，虽然一切皆对象，但是拿到的都是对象的指针。像变量、函数参数等，它们存储的都不是对象本身，而是对象的泛型指针。而基于 PyObject * 和 ob_type，Python 巧妙地实现了多态。 不管变量 obj 指向什么样的可迭代对象，都可以交给 iter 函数，会调用类型对象内部的 __iter__（底层对应 tp_iter 字段），得到迭代器。不管变量 it 指向什么样的迭代器，都可以交给 next 函数进行迭代，会调用迭代器的类型对象的 __next__（底层对应 tp_iternext 字段），将值迭代出来。 至于 __iter__ 和 __next__ 本身，每个迭代器都会有，我们这里只以列表的迭代器为例。所以这是不是实现了多态呢？ 这就是 Python 的设计哲学，变量只是一个指针，传递变量的时候相当于传递指针（将指针拷贝一份），但操作一个变量的时候会自动操作变量（指针）指向的内存。 以上就是 Python 迭代器的相关内容，当然你也完全可以自己封装一个迭代器，有兴趣可以试一下。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"50. 迭代器是怎么实现的？ » 小结","id":"223","title":"小结"},"224":{"body":"当我们执行一个 py 文件的时候，只需要在命令行中输入 python xxx.py 即可，但你有没有想过这背后的流程是怎样的呢？ 首先 py 文件不是一上来就直接执行的，而是会先有一个编译的过程，整个步骤如下： 这里我们看到了 Python 编译器、Python 虚拟机，而且我们平常还会说 Python 解释器，那么三者之间有什么区别呢？ Python 编译器负责将 Python 源代码编译成 PyCodeObject 对象，然后交给 Python 虚拟机来执行。 那么 Python 编译器和 Python 虚拟机都在什么地方呢？如果打开 Python 的安装目录，会发现有一个 python.exe，点击的时候会通过它来启动一个终端。但问题是这个文件大小还不到 100K，不可能容纳一个编译器加一个虚拟机，所以它下面还有一个 python38.dll。没错，编译器、虚拟机都藏身于 python38.dll 当中。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 楔子","id":"224","title":"楔子"},"225":{"body":"在 Python 开发时，我们肯定都见过这个 pyc 文件，它一般位于 __pycache__ 目录中，那么 pyc 文件和 PyCodeObject 之间有什么关系呢？ 首先我们都知道字节码，虚拟机的执行实际上就是对字节码不断解析的一个过程。然而除了字节码之外，还应该包含一些其它的信息，这些信息也是 Python 运行的时候所必需的，比如常量、变量名等等。 因此我们常听到 py 文件被编译成字节码，这句话其实不太严谨，因为字节码只是一个 PyBytesObject 对象、或者说一段字节序列。但很明显，光有字节码是不够的，还有很多的静态信息也需要被收集起来，它们整体被称为 PyCodeObject，然后 PyCodeObject 对象中有一个字段 co_code，它是一个指针，指向了这段字节序列。但是这个对象除了有指向字节码的 co_code 字段之外，还有很多其它字段，负责保存代码涉及到的常量、变量（名字、符号）等等。 所以虽然编写的是 py 文件，但虚拟机执行的是编译后的 PyCodeObject 对象。但是问题来了，难道每一次执行都要将源文件编译一遍吗？如果没有对源文件进行修改的话，那么完全可以使用上一次的编译结果。相信此时你能猜到 pyc 文件是干什么的了，它就是负责保存编译之后的 PyCodeObject 对象。 现在我们知道了，pyc 文件里面保存的内容是 PyCodeObject 对象。对于 Python 编译器来说，PyCodeObject 对象是对源代码编译之后的结果，而 pyc 文件则是这个对象在硬盘上的表现形式。 当下一次运行的时候，Python 解释器会根据 pyc 文件中记录的编译结果，直接建立内存中的 PyCodeObject 对象，而不需要再重新编译了，当然前提是没有对源文件进行修改。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » pyc 文件是什么","id":"225","title":"pyc 文件是什么"},"226":{"body":"既然 PyCodeObject 对象是源代码的编译结果，那么搞清楚它的底层结构就至关重要，下面来看一下它长什么样子。 // Include/cpython/code.h typedef struct { PyObject_HEAD int co_argcount; int co_posonlyargcount; int co_kwonlyargcount; int co_nlocals; int co_stacksize; int co_flags; int co_firstlineno; PyObject *co_code; PyObject *co_consts; PyObject *co_names; PyObject *co_varnames; PyObject *co_freevars; PyObject *co_cellvars; Py_ssize_t *co_cell2arg; PyObject *co_filename; PyObject *co_name; PyObject *co_lnotab; void *co_zombieframe; PyObject *co_weakreflist; void *co_extra; unsigned char *co_opcache_map; _PyOpcache *co_opcache; int co_opcache_flag; unsigned char co_opcache_size;\n} PyCodeObject; 这里面的每一个字段，我们一会儿都会详细介绍，并通过代码逐一演示。总之 Python 编译器在对源代码进行编译的时候，针对每一个 code block（代码块），都会创建一个 PyCodeObject 与之对应。但多少代码才算得上是一个 block 呢？事实上，Python 有一个简单而清晰的规则：当进入一个新的名字空间，或者说作用域时，就算是进入一个新的 block 了。举个例子： class A: a = 123 def foo(): a = [] 我们仔细观察一下上面这段代码，它在编译完之后会有三个 PyCodeObject 对象，一个是对应整个 py 文件（模块）的，一个是对应 class A 的，一个是对应 def foo 的。因为这是三个不同的作用域，所以会有三个 PyCodeObject 对象。 所以一个 code block 对应一个作用域、同时也对应一个 PyCodeObject 对象。Python 的类、函数、模块都有自己独立的作用域，因此在编译时也都会有一个 PyCodeObject 对象与之对应。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 底层结构","id":"226","title":"PyCodeObject 底层结构"},"227":{"body":"PyCodeObject 我们知道它是干什么的了，那如何才能拿到这个对象呢？首先该对象在 Python 里面的类型是 <class 'code'>，但是底层没有将这个类暴露给我们，因此 code 这个名字在 Python 里面只是一个没有定义的变量罢了。 但我们可以通过其它的方式进行获取，比如函数。 def func(): pass print(func.__code__) # <code object ......\nprint(type(func.__code__)) # <class 'code'> 我们可以通过函数的 __code__ 属性拿到底层对应的 PyCodeObject 对象，当然也可以获取里面的字段，下面就来演示一下，并详细介绍每个字段的含义。 PyObject_HEAD：对象的头部信息 我们看到 Python 真的一切皆对象，源代码编译之后的结果也是一个对象。 co_argcount：可以通过位置参数传递的参数个数 def foo(a, b, c=3): pass\nprint(foo.__code__.co_argcount) # 3 def bar(a, b, *args): pass\nprint(bar.__code__.co_argcount) # 2 def func(a, b, *args, c): pass\nprint(func.__code__.co_argcount) # 2 函数 foo 中的参数 a、b、c 都可以通过位置参数传递，所以结果是 3。而函数 bar 则是两个，这里不包括 *args。最后函数 func 显然也是两个，因为参数 c 只能通过关键字参数传递。 co_posonlyargcount：只能通过位置参数传递的参数个数，Python3.8 新增 def foo(a, b, c): pass\nprint(foo.__code__.co_posonlyargcount) # 0 def bar(a, b, /, c): pass\nprint(bar.__code__.co_posonlyargcount) # 2 注意：这里是只能通过位置参数传递的参数个数。对于 foo 而言，里面的三个参数既可以通过位置参数、也可以通过关键字参数传递，所以个数是 0。而函数 bar，里面的 a、b 只能通过位置参数传递，所以个数是 2。 co_kwonlyargcount：只能通过关键字参数传递的参数个数 def foo(a, b=1, c=2, *, d, e): pass\nprint(foo.__code__.co_kwonlyargcount) # 2 这里是 d 和 e，它们必须通过关键字参数传递。 co_nlocals：代码块中局部变量的个数，也包括参数 def foo(a, b, *args, c, **kwargs): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'args', 'kwargs', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_nlocals)\n\"\"\"\n8\n\"\"\" co_varnames 保存的是代码块的局部变量，显然 co_nlocals 就是它的长度。并且我们看到在编译之后，函数的局部变量就已经确定了，因为它们是静态存储的。 co_stacksize：执行该段代码块所需要的栈空间 def foo(a, b, c): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_stacksize) # 1 这个暂时不需要太关注，后续介绍栈帧的时候会详细说明。 co_flags：函数标识 先来提出一个问题： def some_func(): return \"hello world\" def some_gen(): yield return \"hello world\" print(some_func.__class__)\nprint(some_gen.__class__)\n\"\"\"\n<class 'function'>\n<class 'function'>\n\"\"\" print(some_func())\n\"\"\"\nhello world\n\"\"\"\nprint(some_gen())\n\"\"\"\n<generator object some_gen at 0x1028a80b0>\n\"\"\" 调用 some_func 会将代码执行完毕，调用 some_gen 会返回生成器，但问题是这两者都是函数类型，为什么执行的时候会有不同的表现呢？可能有人觉得这还不简单，Python 具有词法作用域，由于 some_func 里面没有出现 yield 关键字，所以是普通函数，而 some_gen 里面出现了 yield，所以是生成器函数。 从源代码来看确实如此，但源代码是要编译成 PyCodeObject 对象的，在编译之后，函数内部是否出现 yield 关键字这一信息要怎么体现呢？答案便是通过 co_flags 字段。 然后解释器内部定义了一系列的标志位，通过和 co_flags 字段按位与，便可判断函数是否具备指定特征。常见的标志位如下： // Include/code.h // 函数参数是否包含 *args\n#define CO_VARARGS 0x0004\n// 函数参数是否包含 **kwargs\n#define CO_VARKEYWORDS 0x0008\n// 函数是否是内层函数\n#define CO_NESTED 0x0010\n// 函数是否是生成器函数\n#define CO_GENERATOR 0x0020\n// 函数是否是协程函数\n#define CO_COROUTINE 0x0080\n// 函数是否是异步生成器函数\n#define CO_ASYNC_GENERATOR 0x0200 我们实际测试一下，比如检测函数的参数类型： CO_VARARGS = 0x0004\nCO_VARKEYWORDS = 0x0008\nCO_NESTED = 0x0010 def foo(*args): pass def bar(): pass # 因为 foo 的参数包含 *args，所以和 CO_VARARGS 按位与的结果为真\n# 而 bar 的参数不包含 *args，所以结果为假\nprint(foo.__code__.co_flags & CO_VARARGS) # 4\nprint(bar.__code__.co_flags & CO_VARARGS) # 0 def foo(**kwargs): pass def bar(): pass print(foo.__code__.co_flags & CO_VARKEYWORDS) # 8\nprint(bar.__code__.co_flags & CO_VARKEYWORDS) # 0 def foo(): def bar(): pass return bar # foo 是外层函数，所以和 CO_NESTED 按位与的结果为假\n# foo() 返回的是内层函数，所以和 CO_NESTED 按位与的结果为真\nprint(foo.__code__.co_flags & CO_NESTED) # 0\nprint(foo().__code__.co_flags & CO_NESTED) # 16 当然啦，co_flags 还可以检测一个函数的类型。比如函数内部出现了 yield，那么它就是一个生成器函数，调用之后会得到一个生成器；使用 async def 定义，那么它就是一个协程函数，调用之后会得到一个协程。 这些在词法分析的时候就可以检测出来，编译之后会体现在 co_flags 字段中。 CO_GENERATOR = 0x0020\nCO_COROUTINE = 0x0080\nCO_ASYNC_GENERATOR = 0x0200 # 如果是生成器函数，那么 co_flags & 0x20 为真\ndef foo1(): yield\nprint(foo1.__code__.co_flags & 0x20) # 32 # 如果是协程函数，那么 co_flags & 0x80 为真\nasync def foo2(): pass\nprint(foo2.__code__.co_flags & 0x80) # 128\n# 显然 foo2 不是生成器函数，所以 co_flags & 0x20 为假\nprint(foo2.__code__.co_flags & 0x20) # 0 # 如果是异步生成器函数，那么 co_flags & 0x200 为真\nasync def foo3(): yield\nprint(foo3.__code__.co_flags & 0x200) # 512\n# 显然它不是生成器函数、也不是协程函数\n# 因此和 0x20、0x80 按位与之后，结果都为假\nprint(foo3.__code__.co_flags & 0x20) # 0\nprint(foo3.__code__.co_flags & 0x80) # 0 在判断函数种类时，这种方式是最优雅的。 co_firstlineno：代码块的起始位置在源文件中的哪一行 def foo(a, b, c): pass # 显然是文件的第一行\n# 或者理解为 def 所在的行\nprint(foo.__code__.co_firstlineno) # 1 如果函数出现了调用呢？ def foo(): return bar def bar(): pass print(foo().__code__.co_firstlineno) # 4 如果执行 foo，那么会返回函数 bar，因此结果是 def bar(): 所在的行数。所以每个函数都有自己的作用域，以及 PyCodeObject 对象。 co_code：指令集，也就是字节码，它是一个 bytes 对象 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 字节码，一个 bytes 对象，它保存了要操作的指令\n# 但光有字节码是肯定不够的，还需要其它的静态信息\n# 显然这些信息连同字节码一样，都位于 PyCodeObject 中\nprint(foo.__code__.co_code)\n\"\"\"\nb'd\\x01}\\x03d\\x02}\\x04d\\x03}\\x05t\\x00|\\x03|\\x04|\\x05\\x83\\x03\\x01\\x00d\\x00S\\x00'\n\"\"\" co_consts：常量池，一个元组，保存代码块中创建的所有常量 def foo(): a = 122 + 1 b = \"hello\" c = (1, 2) d = [\"x\", \"y\"] e = {\"p\": \"k\"} f = {7, 8} print(foo.__code__.co_consts)\n\"\"\"\n(None, 123, 'hello', (1, 2), 'x', 'y', 'p', 'k', 7, 8)\n\"\"\" co_consts 里面出现的都是编译阶段可以确定的常量，而 [\"x\", \"y\"] 和 {\"p\": \"k\"} 没有出现，由此我们可以得出，列表和字典绝不是在编译阶段构建的。编译时，只是收集了里面的元素，然后等到运行时再去动态构建。 不过问题来了，在构建的时候解释器怎么知道是要构建列表、还是字典、亦或是其它的什么对象呢？所以这就依赖于字节码了，解释字节码的时候，会判断到底要构建什么样的对象。因此解释器执行的是字节码，核心逻辑都体现在字节码中，但是光有字节码还不够，它包含的只是程序的主干逻辑，至于变量、常量，则从符号表和常量池里面获取。 另外函数里面的变量 a 等于 122 + 1，但常量池里面却存储了 123，这个过程叫做常量折叠。常量之间的加减乘除，结果依旧是一个常量，编译阶段就会计算好。 co_names：符号表，一个元组，保存代码块中引用的其它作用域的变量 c = 1 def foo(a, b): print(a, b, c) d = (list, int, str) print(foo.__code__.co_names)\n\"\"\"\n('print', 'c', 'list', 'int', 'str')\n\"\"\" 虽然一切皆对象，但看到的都是指向对象的变量，所以 print, c, list, int, str 都是变量，它们都不在当前 foo 函数的作用域中。 co_varnames：符号表，一个元组，保存当前作用域中创建的局部变量 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 当前作用域中创建的变量，注意它和 co_names 的区别\n# co_varnames 保存的是当前作用域中创建的局部变量\n# 而 co_names 保存的是当前作用域中引用的其它作用域的变量\nprint(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_varnames)\n\"\"\"\n('print',)\n\"\"\" co_cellvars：一个元组，保存外层函数的作用域中被内层函数引用的变量 co_freevars：一个元组，保存内层函数引用的外层函数的作用域中的变量 def foo(a, b, c): def bar(): print(a, b, c) return bar # co_cellvars：外层函数的作用域中被内层函数引用的变量\n# co_freevars：内层函数引用的外层函数的作用域中的变量\nprint(foo.__code__.co_cellvars)\nprint(foo.__code__.co_freevars)\n\"\"\"\n('a', 'b', 'c')\n()\n\"\"\"\n# foo 里面的变量 a、b、c 被内层函数 bar 引用了\n# 所以它的 co_cellvars 是 ('a', 'b', 'c')\n# 而 foo 不是内层函数，所以它的 co_freevars 是 () bar = foo(1, 2, 3)\nprint(bar.__code__.co_cellvars)\nprint(bar.__code__.co_freevars)\n\"\"\"\n()\n('a', 'b', 'c')\n\"\"\"\n# bar 引用了外层函数 foo 里面的变量 a、b、c\n# 所以它的 co_freevars 是 ('a', 'b', 'c')\n# 而 bar 已经是最内层函数了，所以它的 co_cellvars 是 () 当然目前的函数只嵌套了两层，但嵌套三层甚至更多层也是一样的。 def foo(a, b, c): def bar(d, e): print(a) def func(): print(b, c, d, e) return func return bar # 对于 foo 而言，它的内层函数就是 bar\n# 至于最里面的 func，由于定义在 bar 的内部，因此可以看做是 bar 函数体的一部分\n# 而 foo 里面的变量 a、b、c 都被内层函数引用了\nprint(foo.__code__.co_cellvars) # ('a', 'b', 'c')\nprint(foo.__code__.co_freevars) # () bar = foo(1, 2, 3)\n# 对于函数 bar 而言，它的内层函数就是 func\n# 而显然 bar 里面的变量 d 和 e 被 func 引用了\nprint(bar.__code__.co_cellvars) # ('d', 'e')\n# 然后 bar 引用了外层函数 foo 里面的 a、b、c\nprint(bar.__code__.co_freevars) # ('a', 'b', 'c')\n# 所以 co_cellvars 和 co_freevars 这两个字段的关系有点类似镜像 co_cellvars 和 co_freevars 在后续介绍闭包的时候会用到。 co_filename：代码块所在的文件的路径 # 文件名：main.py\ndef foo(): pass print(foo.__code__.co_filename)\n\"\"\"\n/Users/satori/Documents/testing_project/main.py\n\"\"\" 如果你无法使用 IDE，那么便可通过该字段查看函数定义在哪个文件中。 co_name：代码块的名字 def foo(): pass print(foo.__code__.co_name) # foo 对于函数来说，代码块的名字就是函数名。 co_lnotab：负责存储指令的偏移量和源代码行号之间的对应关系 PyCodeObject 是源代码编译之后的产物，虽然两者的结构千差万别，但体现出的信息是一致的。像源代码具有行号，那么编译成 PyCodeObject 之后，行号信息也应该要有专门的字段来维护，否则报错时我们就无法快速定位到行号。 def foo(): name = \"古明地觉\" hobby = ( \"sing\", \"dance\", \"rap\", \"🏀\" ) age = 16 我们通过 dis 模块反编译一下。 第一列数字表示行号，第二列数字表示字节码指令的偏移量，或者说指令在整个字节码指令集中的索引。我们知道字节码指令集就是一段字节序列，由 co_code 字段维护，并且每个指令都带有一个参数，所以偏移量（索引）为 0 2 4 6 8 ··· 的字节表示指令，偏移量为 1 3 5 7 9 ··· 的字节表示参数。 关于反编译的具体细节后续会说，总之一个字节码指令就是一个八位整数。对于当前函数来说，它的字节码偏移量和行号的对应关系如下： 偏移量和源代码行号的对应关系便由 co_lnotab（一个字节序列）维护，只不过 co_lnotab 并没有直接记录这些信息，而是记录的增量值。 (0, 1) 到 (0, 2)：偏移量增加 0，行号增加 1； (0, 2) 到 (4, 3)：偏移量增加 4，行号增加 1； (4, 3) 到 (8, 9)：偏移量增加 4，行号增加 6； 所以 co_lnotab 便是 0 1 4 1 4 6，我们验证一下。 结果和我们分析的一样。 以上就是 PyCodeObject 里面的字段的含义，至于剩下的几个字段就无需关注了。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 字段解析","id":"227","title":"PyCodeObject 字段解析"},"228":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机。 编译器先将 .py 源码文件编译成 PyCodeObject 对象，然后再交给虚拟机执行。 PyCodeObject 对象可以认为是源码文件的另一种等价形式，但经过编译，虚拟机可以更快速地执行。 为了避免每次都要对源文件进行编译，因此编译后的结果会序列化在 .pyc 文件中，如果源文件没有做改动，那么下一次执行时会直接从 .pyc 文件中读取。 Python 的函数、类、模块等，都具有各自的作用域，每个作用域对应一个独立的代码块，在编译时，Python 编译器会为每个代码块都创建一个 PyCodeObject 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 小结","id":"228","title":"小结"},"229":{"body":"上一篇文章我们介绍了 PyCodeObject 对象，但是还遗漏了一些内容，这里再单独补充一下。","breadcrumbs":"52. PyCodeObject 拾遗 » 楔子","id":"229","title":"楔子"},"23":{"body":"type 是所有类型对象的类型，我们称之为元类型或者元类，即 metaclass，当然它同时也是一个类型对象。下面看一下它的底层实现。 // Objects/typeobject.c PyTypeObject PyType_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"type\", /* tp_name */ sizeof(PyHeapTypeObject), /* tp_basicsize */ sizeof(PyMemberDef), /* tp_itemsize */ (destructor)type_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ (reprfunc)type_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ (ternaryfunc)type_call, /* tp_call */ // ...\n}; 所有的类型对象加上元类都是由 PyTypeObject 这个结构体实例化得到的，所以它们内部的字段都是一样的。只不过传入的值不同，实例化之后得到的结果也不同，可以是 PyLong_Type、可以是 PyFloat_Type，也可以是这里的 PyType_Type。 再看一下里面的宏 PyVarObject_HEAD_INIT，它用来初始化引用计数、类型和 ob_size，其中类型被初始化成了 &PyType_Type。换句话说，PyType_Type 里面的 ob_type 字段指向的还是 PyType_Type，而对应 Python 的话，就是 type 的类型还是 type。 >>> type.__class__\n<class 'type'>\n>>> type.__class__.__class__.__class__.__class__.__class__ is type\nTrue\n>>> type(type(type(type(type(type))))) is type\nTrue 显然不管套娃多少次，最终的结果都是 True，这也是符合预期的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的类型：PyType_Type","id":"23","title":"类型对象的类型：PyType_Type"},"230":{"body":"之前通过函数的 __code__ 属性获取了该函数的 PyCodeObject 对象，但是还有没有其它的方法呢？显然是有的，答案是通过内置函数 compile，不过在介绍 compile 之前，先介绍一下 eval 和 exec。 eval：传入一个字符串，然后把字符串里面的内容当做表达式。 a = 1\n# 所以 eval(\"a\") 就等价于 a\nprint(eval(\"a\")) # 1\nprint(eval(\"1 + 1 + 1\")) # 3 注意：eval 是有返回值的，返回值就是字符串里面的内容。所以 eval 接收的字符串里面一定是一个表达式，表达式计算之后是一个具体的值，比如 a = eval(\"1 + 2\")，等价于 a = 3。 但如果是语句的话，比如 a = eval(\"b = 3\")，这样等价于 a = (b = 3)，显然这会出现语法错误。因此 eval 函数把字符串两边的引号剥掉之后，得到的一定是一个普通的值。 try: print(eval(\"xxx\"))\nexcept NameError as e: print(e) # name 'xxx' is not defined 此时等价于 print(xxx)，但是 xxx 没有定义，所以报错。 # 此时是合法的，等价于 print('xxx')\nprint(eval(\"'xxx'\")) # xxx 以上就是 eval 函数，使用起来还是很方便的。 exec：传入一个字符串，把字符串里面的内容当成语句来执行，这个是没有返回值的，或者说返回值是 None。 # 相当于 a = 1\nexec(\"a = 1\") print(a) # 1 statement = \"\"\"\na = 123\nif a == 123: print(\"a 等于 123\")\nelse: print(\"a 不等于 123\")\n\"\"\"\nexec(statement) # a 等于 123 注意：a 等于 123 并不是 exec 返回的，而是把上面那坨字符串当成普通代码执行的时候 print 出来的。这便是 exec 的作用，将字符串当成语句来执行。 所以使用 exec 可以非常方便地创建多个变量。 import random for i in range(1, 5): exec(f\"a{i} = {random.randint(1, 100)}\") print(a1) # 72\nprint(a2) # 21\nprint(a3) # 38\nprint(a4) # 32 那么 exec 和 eval 的区别就显而易见了，eval 是要求字符串里面的内容能够当成一个值，并且该值就是 eval 函数的返回值。而 exec 则是直接执行里面的内容，返回值是 None。 print(eval(\"1 + 1\")) # 2\nprint(exec(\"1 + 1\")) # None # 相当于 a = 2\nexec(\"a = 1 + 1\")\nprint(a) # 2 try: # 相当于 a = 2，但很明显 a = 2 是一个语句 # 它无法作为一个值，因此放到 eval 里面就报错了 eval(\"a = 1 + 1\")\nexcept SyntaxError as e: print(e) # invalid syntax (<string>, line 1) 还是很好区分的，但是 eval 和 exec 在生产中尽量要少用。另外，eval 和 exec 还可以接收第二个参数和第三个参数，我们在介绍名字空间的时候再说。 compile：关键来了，它执行后返回的就是一个 PyCodeObject 对象。 这个函数接收哪些参数呢？ 参数一：当成代码执行的字符串 参数二：可以为这些代码起一个文件名 参数三：执行方式，支持三种，分别是 exec、single、eval 我们演示一下。 # exec：将源代码当做一个模块来编译\n# single：用于编译一个单独的 Python 语句（交互式）\n# eval：用于编译一个 eval 表达式\nstatement = \"a, b = 1, 2\"\n# 这里我们选择 exec，当成一个模块来编译\nco = compile(statement, \"古明地觉的编程教室\", \"exec\") print(co.co_firstlineno) # 1\nprint(co.co_filename) # 古明地觉的编程教室\nprint(co.co_argcount) # 0\n# 我们是以 a, b = 1, 2 这种方式赋值\n# 所以 (1, 2) 会被当成一个元组加载进来\n# 因此从这里可以看出，元组在编译阶段就已经确定好了\nprint(co.co_consts) # ((1, 2), None) statement = \"\"\"\na = 1\nb = 2\n\"\"\"\nco = compile(statement, \"<file>\", \"exec\")\nprint(co.co_consts) # (1, 2, None)\nprint(co.co_names) # ('a', 'b') 我们后面在分析 PyCodeObject 的时候，会经常使用 compile 函数。 然后 compile 还可以接收一个 flags 参数，也就是第四个参数，它的默认值为 0，表示按照标准模式进行编译，就是之前说的那几步。 对文本形式的源代码进行分词，将其切分成一个个的 Token； 对 Token 进行语法解析，生成抽象语法树（AST）； 将 AST 编译成 PyCodeObject 对象，简称 code 对象或者代码对象； 但如果将 flags 指定为 1024，那么 compile 函数在生成 AST 之后会直接停止，然后返回一个 _ast.Module 对象。 print( compile(\"a = 1\", \"<file>\", \"exec\").__class__\n) # <class 'code'> print( compile(\"a = 1\", \"<file>\", \"exec\", flags=1024).__class__\n) # <class '_ast.Module'> _ast 模块是和 Python 的抽象语法树相关的，那么问题来了，这个 _ast.Module 对象能够干什么呢？别着急，我们后续在介绍栈帧的时候说。不过由于抽象语法树比较底层，因此知道 compile 的前三个参数的用法即可。","breadcrumbs":"52. PyCodeObject 拾遗 » 内置函数 compile","id":"230","title":"内置函数 compile"},"231":{"body":"关于 Python 的字节码，是后面剖析虚拟机的重点，现在先来看一下。我们知道执行源代码之前会先编译得到 PyCodeObject 对象，里面的 co_code 字段指向了字节码序列，或者说字节码指令集。 虚拟机会根据这些指令集来进行一系列的操作（当然也依赖其它的静态信息），从而完成对程序的执行。关于指令，解释器定义了 100 多种，我们大致看一下。 // Include/opcode.h\n#define POP_TOP 1\n#define ROT_TWO 2\n#define ROT_THREE 3\n#define DUP_TOP 4\n#define DUP_TOP_TWO 5\n#define ROT_FOUR 6\n#define NOP 9\n#define UNARY_POSITIVE 10\n#define UNARY_NEGATIVE 11\n#define UNARY_NOT 12\n#define UNARY_INVERT 15\n#define BINARY_MATRIX_MULTIPLY 16\n#define INPLACE_MATRIX_MULTIPLY 17\n#define BINARY_POWER 19\n#define BINARY_MULTIPLY 20\n#define BINARY_MODULO 22\n#define BINARY_ADD 23\n#define BINARY_SUBTRACT 24\n#define BINARY_SUBSCR 25\n#define BINARY_FLOOR_DIVIDE 26\n#define BINARY_TRUE_DIVIDE 27\n#define INPLACE_FLOOR_DIVIDE 28\n#define INPLACE_TRUE_DIVIDE 29\n#define GET_AITER 50\n#define GET_ANEXT 51\n#define BEFORE_ASYNC_WITH 52\n#define BEGIN_FINALLY 53\n#define END_ASYNC_FOR 54\n#define INPLACE_ADD 55\n#define INPLACE_SUBTRACT 56\n#define INPLACE_MULTIPLY 57\n#define INPLACE_MODULO 59\n#define STORE_SUBSCR 60\n#define DELETE_SUBSCR 61\n#define BINARY_LSHIFT 62\n#define BINARY_RSHIFT 63\n#define BINARY_AND 64\n#define BINARY_XOR 65\n#define BINARY_OR 66\n#define INPLACE_POWER 67\n#define GET_ITER 68\n#define GET_YIELD_FROM_ITER 69\n#define PRINT_EXPR 70\n#define LOAD_BUILD_CLASS 71\n#define YIELD_FROM 72\n#define GET_AWAITABLE 73\n#define INPLACE_LSHIFT 75\n#define INPLACE_RSHIFT 76\n// ... 所谓字节码指令其实就是个整数，多个指令组合在一起便是字节码指令集（字节码序列），它是一个 bytes 对象。当然啦，指令集里面不全是指令，索引（偏移量）为偶数的字节表示指令，索引为奇数的字节表示指令参数，后续会细说。 然后我们可以通过反编译的方式查看每行 Python 代码都对应哪些操作指令。 # Python 的 dis 模块专门负责干这件事情\nimport dis def foo(a, b): c = a + b return c # 里面接收 PyCodeObject 对象\n# 当然函数也是可以的，会自动获取 co_code\ndis.dis(foo)\n\"\"\" 2 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 BINARY_ADD 6 STORE_FAST 2 (c) 3 8 LOAD_FAST 2 (c) 10 RETURN_VALUE\n\"\"\" 字节码反编译后的结果多么像汇编语言，其中第一列是源代码行号，第二列是字节码偏移量，第三列是字节码指令（也叫操作码），第四列是指令参数（也叫操作数）。Python 的字节码指令都是成对出现的，每个指令会带有一个指令参数。 另外查看字节码也可以使用 opcode 模块： from opcode import opmap opmap = {v: k for k, v in opmap.items()} def foo(a, b): c = a + b return c code = foo.__code__.co_code\nfor i in range(0, len(code), 2): print(\"操作码: {:<12} 操作数: {}\".format( opmap[code[i]], code[i+1] ))\n\"\"\"\n操作码: LOAD_FAST 操作数: 0\n操作码: LOAD_FAST 操作数: 1\n操作码: BINARY_ADD 操作数: 0\n操作码: STORE_FAST 操作数: 2\n操作码: LOAD_FAST 操作数: 2\n操作码: RETURN_VALUE 操作数: 0\n\"\"\" 总之字节码就是一段字节序列，转成列表之后就是一堆数字。偶数位置表示指令本身，而每个指令后面都会跟一个指令参数，也就是奇数位置表示指令参数。 所以指令本质上只是一个整数，而虚拟机会根据不同的指令执行不同的逻辑。说白了 Python 虚拟机执行字节码的逻辑就是把自己想象成一颗 CPU，并内置了一个巨型的 switch case 语句，其中每个指令都对应一个 case 分支。然后遍历整条字节码，拿到每一个指令和指令参数。接着对指令进行判断，不同的指令进入不同的 case 分支，执行不同的处理逻辑，直到字节码全部执行完毕或者程序出错。 关于执行字节码的具体流程，等介绍栈帧的时候细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"52. PyCodeObject 拾遗 » 字节码与反编译","id":"231","title":"字节码与反编译"},"232":{"body":"上一篇文章我们介绍了字节码，当时提到，py 文件在执行的时候会先被编译成 PyCodeObject 对象，并且该对象还会被保存到 pyc 文件中。 然而事实并不总是这样，有时当我们运行一个简单的程序时，并没有产生 pyc 文件。因此我们猜测：有些 Python 程序只是临时完成一些琐碎的工作，这样的程序仅仅只会运行一次，然后就不会再使用了，因此也就没有保存至 pyc 文件的必要。 如果我们在代码中加上了一个 import abc 这样的语句，再执行你就会发现解释器为 abc.py 生成了 pyc 文件，这就说明 import 语句会触发 pyc 的生成。 实际上，在运行过程中，如果碰到 import abc 这样的语句，那么 Python 会在设定好的 path 中寻找 abc.pyc 或者 abc.pyd 文件。但如果没有这些文件，而是只发现了 abc.py，那么会先将 abc.py 编译成 PyCodeObject，然后写入到 pyc 文件中。 接下来，再对 abc.pyc 进行 import 动作。对的，并不是编译成 PyCodeObject 对象之后就直接使用，而是先写到 pyc 文件里，然后再将 pyc 文件里面的 PyCodeObject 对象重新在内存中复制出来。 当然啦，触发 pyc 文件生成不仅可以通过 import，还可以通过 py_compile 模块手动生成。比如当前有一个 tools.py，代码如下。 a = 1\nb = \"你好啊\" 如何将其编译成 pyc 呢？ import py_compile py_compile.compile(\"tools.py\") 查看当前目录的 __pycache__ 目录，会发现 pyc 已经生成了。 py文件名.cpython-版本号.pyc 便是编译之后的 pyc 文件名。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的触发","id":"232","title":"pyc 文件的触发"},"233":{"body":"如果有一个现成的 pyc 文件，我们要如何导入它呢？ from importlib.machinery import SourcelessFileLoader tools = SourcelessFileLoader( \"tools\", \"__pycache__/tools.cpython-38.pyc\"\n).load_module() print(tools.a) # 1\nprint(tools.b) # 你好啊 以上我们就成功手动导入了 pyc 文件。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的导入","id":"233","title":"pyc 文件的导入"},"234":{"body":"pyc 文件在创建的时候都会往里面写入哪些内容呢？ 1）magic number 这是解释器内部定义的一个值，不同版本的解释器会定义不同的 magic number，这个值是为了保证能够加载正确的 pyc，比如 Python3.8 不会加载 3.7 版本的 pyc。因为解释器在加载 pyc 文件的时候会检测该 pyc 的 magic number，如果和自身的 magic number 不一致，说明此 pyc 是由其它版本的解释器写入的，因此拒绝加载。 from importlib.util import MAGIC_NUMBER\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: magic_number = f.read(4)\nprint(magic_number) # b'U\\r\\r\\n' pyc 文件的前 4 个字节便是 magic number。 2）py 文件的最后修改时间 这个很好理解，在加载 pyc 的时候会比较源代码的实际修改时间和 pyc 文件中存储的修改时间。如果两者不相等，说明在生成 pyc 之后，源代码又被修改了，那么会重新编译并写入 pyc，而反之则会直接加载已存在的 pyc。 3）py 文件的大小 py 文件的大小也会被记录在 pyc 文件中。 4）PyCodeObject 对象 编译之后的 PyCodeObject 对象，这个不用说了，肯定是要存储的，并且是序列化之后再存储。 因此 pyc 文件的结构如下： 我们实际验证一下： import struct\nfrom importlib.util import MAGIC_NUMBER\nfrom datetime import datetime with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 0 ~ 4 字节是 MAGIC NUMBER\nprint(data[: 4]) # b'U\\r\\r\\n'\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' # 4 ~ 8 字节是 4 个 \\x00\nprint(data[4: 8]) # b'\\x00\\x00\\x00\\x00' # 8 ~ 12 字节是 py 文件的最后修改时间（小端存储），一个时间戳\nts = struct.unpack(\"<I\", data[8: 12])[0]\nprint(ts) # 1734595934\nprint(datetime.fromtimestamp(ts)) # 2024-12-19 08:12:14 # 12 ~ 16 字节是 py 文件的大小\nprint(struct.unpack(\"<I\", data[12: 16])[0]) # 22 那么实际的 tools.py 是不是这样呢？我们查看一下。 结果没有问题，实际大小是 22 字节，和 pyc 文件记录的一样。然后是最后修改时间，由于在生成 pyc 之后，没有对源文件做修改，所以它的最后修改时间和 pyc 文件记录的一样，都是 08:12。但如果我们再对 tools.py 做修改的话，那么它的最后修改时间和 pyc 文件记录的就不一样了，此时如果再导入 tools.py 就会重新编译生成 pyc，并写入新的最后修改时间。 以上就是 pyc 文件的前 16 个字节，而 16 个字节往后就是 PyCodeObject 对象，并且是序列化之后的，因为该对象显然无法直接存在文件中。 import marshal with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 通过 marshal.loads 可以反序列化\n# marshal.dumps 则表示序列化\ncode = marshal.loads(data[16:])\n# 此时就拿到了 py 文件编译之后的 PyCodeObject\nprint(code)\n\"\"\"\n<code object <module> at 0x..., file \"tools.py\", line 1>\n\"\"\"\n# 查看常量池\nprint(code.co_consts) # (1, '你好啊', None) # 符号表\nprint(code.co_names) # ('a', 'b') 常量池和符号表都是正确的。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件都包含哪些内容","id":"234","title":"pyc 文件都包含哪些内容"},"235":{"body":"下面通过源码来查看 pyc 文件的写入过程，既然要写入，那么肯定要有文件句柄。 // Python/marshal.c // FILE 是 C 自带的文件句柄\n// 可以把 WFILE 看成是 FILE 的包装\ntypedef struct { FILE *fp; // 下面的字段在写入数据的时候会看到 int error; int depth; PyObject *str; char *ptr; char *end; char *buf; _Py_hashtable_t *hashtable; int version;\n} WFILE; 首先是写入 magic number、创建时间和文件大小，它们会调用 PyMarshal_WriteLongToFile 函数进行写入： // Python/marshal.c\nvoid\nPyMarshal_WriteLongToFile(long x, FILE *fp, int version)\n{ // magic number、创建时间和文件大小，只是一个 4 字节整数 // 因此使用 char[4] 来保存 char buf[4]; // 声明一个 WFILE 类型的变量 wf WFILE wf; // 内存初始化 memset(&wf, 0, sizeof(wf)); // 初始化内部字段 wf.fp = fp; // 文件句柄 wf.ptr = wf.buf = buf; // buf 数组首元素的地址 wf.end = wf.ptr + sizeof(buf); // buf 数组尾元素的地址 wf.error = WFERR_OK; wf.version = version; // 调用 w_long 将信息写到 wf 里面 // 写入的信息可以是 magic number、时间和文件大小 w_long(x, &wf); // 刷到磁盘上 w_flush(&wf);\n} 所以该函数只是初始化了一个 WFILE 对象，真正写入则是调用的 w_long。 // Python/marshal.c\nstatic void\nw_long(long x, WFILE *p)\n{ w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); w_byte((char)((x>>16) & 0xff), p); w_byte((char)((x>>24) & 0xff), p);\n} w_long 则是调用 w_byte 将 x 逐个字节地写到文件里面去。 当头信息写完之后，就该写 PyCodeObject 对象了，这个过程由 PyMarshal_WriteObjectToFile 函数负责。 // Python/marshal.c\nvoid\nPyMarshal_WriteObjectToFile(PyObject *x, FILE *fp, int version)\n{ char buf[BUFSIZ]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; if (w_init_refs(&wf, version)) return; /* caller mush check PyErr_Occurred() */ // 写入头信息由 PyMarshal_WriteLongToFile 负责，它内部会调用 w_long // 写入 PyCodeObject 由当前函数负责，它内部会调用 w_object w_object(x, &wf); w_clear_refs(&wf); w_flush(&wf);\n} 然后我们看一下 w_object 函数。 // Python/marshal.c\nstatic void\nw_object(PyObject *v, WFILE *p)\n{ char flag = '\\0'; p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->error = WFERR_NESTEDTOODEEP; } else if (v == NULL) { w_byte(TYPE_NULL, p); } else if (v == Py_None) { w_byte(TYPE_NONE, p); } else if (v == PyExc_StopIteration) { w_byte(TYPE_STOPITER, p); } else if (v == Py_Ellipsis) { w_byte(TYPE_ELLIPSIS, p); } else if (v == Py_False) { w_byte(TYPE_FALSE, p); } else if (v == Py_True) { w_byte(TYPE_TRUE, p); } else if (!w_ref(v, &flag, p)) w_complex_object(v, flag, p); p->depth--;\n} 可以看到 w_object 和 w_long 一样，本质上都是调用了 w_byte。当然 w_byte 只能写入一些简单数据，如果是列表、字典之类的数据，那么会调用 w_complex_object 函数，也就是代码中的最后一个 else if 分支。 w_complex_object 这个函数的源代码很长，我们看一下整体结构，具体逻辑就不贴了，后面会单独截取一部分进行分析。 // Python/marshal.c static void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ Py_ssize_t i, n; // 如果是整数，执行整数的写入逻辑 if (PyLong_CheckExact(v)) { // ... } // 如果是浮点数，执行浮点数的写入逻辑 else if (PyFloat_CheckExact(v)) { // ... } // 如果是复数，执行复数的写入逻辑 else if (PyComplex_CheckExact(v)) { // ... } // 如果是字节序列，执行字节序列的写入逻辑 else if (PyBytes_CheckExact(v)) { // ... } // 如果是字符串，执行字符串的写入逻辑 else if (PyUnicode_CheckExact(v)) { // ... } // 如果是元组，执行元组的写入逻辑 else if (PyTuple_CheckExact(v)) { // ... } // 如果是列表，执行列表的写入逻辑 else if (PyList_CheckExact(v)) { // ... } // 如果是字典，执行字典的写入逻辑 else if (PyDict_CheckExact(v)) { // ... } // 如果是集合，执行集合的写入逻辑 else if (PyAnySet_CheckExact(v)) { // ... } // 如果是 PyCodeObject 对象，执行 PyCodeObject 对象的写入逻辑 else if (PyCode_Check(v)) { // ... } // 如果是 Buffer，执行 Buffer 的写入逻辑 else if (PyObject_CheckBuffer(v)) { // ... } else { W_TYPE(TYPE_UNKNOWN, p); p->error = WFERR_UNMARSHALLABLE; }\n} 源代码虽然长，但是逻辑非常单纯，就是对不同的对象、执行不同的写动作，然而其最终目的都是通过 w_byte 写到 pyc 文件中。了解完函数的整体结构之后，我们再看一下具体细节，看看它在写入对象的时候到底写入了哪些内容？ // Python/marshal.c\nstatic void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ // ...... else if (PyList_CheckExact(v)) { W_TYPE(TYPE_LIST, p); n = PyList_GET_SIZE(v); W_SIZE(n, p); for (i = 0; i < n; i++) { w_object(PyList_GET_ITEM(v, i), p); } } else if (PyDict_CheckExact(v)) { Py_ssize_t pos; PyObject *key, *value; W_TYPE(TYPE_DICT, p); /* This one is NULL object terminated! */ pos = 0; while (PyDict_Next(v, &pos, &key, &value)) { w_object(key, p); w_object(value, p); } w_object((PyObject *)NULL, p); } // ......\n} 以列表和字典为例，它们在写入的时候实际上写的是内部的元素，其它对象也是类似的。 def foo(): lst = [1, 2, 3] # 把列表内的元素写进去了\nprint( foo.__code__.co_consts\n) # (None, 1, 2, 3) 但很明显，如果只是将元素收集起来显然是不够的，否则 Python 在加载的时候怎么知道它是一个列表呢？所以在写入的时候不能光写数据，还要将类型信息也写进去。我们再看一下上面列表和字典的写入逻辑，里面都调用了 W_TYPE，它负责写入类型信息。 因此无论对于哪种对象，在写入具体数据之前，都会先调用 W_TYPE 将类型信息写进去。如果没有类型信息，那么当解释器加载 pyc 文件的时候，只会得到一坨字节流，而无法解析字节流中隐藏的结构和蕴含的信息。所以在往 pyc 文件里写入数据之前，必须先写入一个标识，比如 TYPE_LIST、TYPE_TUPLE、TYPE_DICT 等等，这些标识正是对应的类型信息。 如果解释器在 pyc 文件中发现了这样的标识，则预示着上一个对象结束，新的对象开始，并且也知道新对象是什么样的对象，从而也知道该执行什么样的构建动作。至于这些标识都是可以看到的，在底层已经定义好了。 到了这里可以看到，Python 对 PyCodeObject 对象的导出实际上是不复杂的。因为不管什么对象，最后都会归结为两种简单的形式，一种是数值写入，一种是字符串写入。 上面都是对数值的写入，比较简单，仅仅需要按照字节依次写入 pyc 即可。然而在写入字符串的时候，Python 设计了一种比较复杂的机制，有兴趣可以自己阅读源码，这里不再介绍。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的写入","id":"235","title":"pyc 文件的写入"},"236":{"body":"最后再来说一下字节码混淆，我们知道 pyc 是可以反编译的，而且目前也有现成的工具。但这些工具会将每一个指令都解析出来，所以字节码混淆的方式就是往里面插入一些恶意指令（比如加载超出范围的数据），让反编译工具在解析的时候报错，从而失去作用。 但插入的恶意指令还不能影响解释器执行，因此还要插入一些跳转指令，从而让解释器跳过恶意指令。 混淆之后多了两条指令，其中偏移量为 8 的指令，参数为 255，表示加载常量池中索引为 255 的元素。如果常量池没有这么多元素，那么显然会发生索引越界，导致反编译的时候报错。 但对于解释器来说，是可以正常执行的，因为在执行到偏移量为 6 的指令时出现了一个相对跳转，直接跳到偏移量为 6 + 4 = 10 的指令了。 因此对于解释器执行来说，混淆前后是没有区别的，但对于反编译工具而言则无法正常工作，因为它会把每个指令都解析一遍。根据这个思路，我们可以插入很多很多的恶意指令，然后再利用跳转指令来跳过这些不合法的指令。当然混淆的手段并不止这些，我们还可以添加一些虚假的分支，然后在执行时跳转到真实的分支当中。 而这一切的目的，都是为了防止别人根据 pyc 文件反推出源代码。不过这种做法属于治标不治本，如果真的想要保护源代码的话，可以使用 Cython 将其编译成 pyd ，这是最推荐的做法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » 字节码混淆","id":"236","title":"字节码混淆"},"237":{"body":"从现在开始，我们将剖析虚拟机运行字节码的原理。前面说了，Python 解释器可以分为两部分：Python 编译器和 Python 虚拟机。编译器将源代码编译成 PyCodeObject 对象之后，就由虚拟机接手整个工作。虚拟机会从 PyCodeObject 中读取字节码，并在当前的上下文中执行，直到所有的字节码都被执行完毕。 那么问题来了，既然源代码在经过编译之后，字节码指令以及静态信息都存储在 PyCodeObject 当中，那么是不是意味着虚拟机就在 PyCodeObject 对象上进行所有的动作呢？ 很明显不是的，因为尽管 PyCodeObject 包含了关键的字节码指令以及静态信息，但有一个东西是没有包含、也不可能包含的，就是程序在运行时的执行环境，这个执行环境在 Python 里面就是栈帧。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 楔子","id":"237","title":"楔子"},"238":{"body":"那什么是栈帧呢？我们举个例子。 name = \"古明地觉\" def some_func(): name = \"八意永琳\" print(name) some_func()\nprint(name) 上面的代码当中出现了两个 print(name)，它们的字节码指令相同，但执行的效果却显然是不同的，这样的结果正是执行环境的不同所产生的。因为环境的不同，name 的值也不同。 因此同一个符号在不同环境中可能指向不同的类型、不同的值，必须在运行时进行动态捕捉和维护，这些信息不可能在 PyCodeObject 对象中被静态存储。 所以可以得出结论，虚拟机并不是在 PyCodeObject 对象上执行操作的，而是在栈帧对象上。虚拟机在执行时，会根据 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。所以栈帧是虚拟机执行的上下文，执行时依赖的所有信息都存储在栈帧中。 然后对于上面的代码，我们可以大致描述一下流程： 首先基于模块的 PyCodeObject 创建一个栈帧，假设叫 A，所有的字节码都会在栈帧中执行，虚拟机可以从栈帧里面获取变量的值，也可以修改； 当发生函数调用的时候，这里是 some_func，那么虚拟机会在栈帧 A 之上，为 some_func 创建一个新的栈帧，假设叫 B，然后在栈帧 B 里面执行函数 some_func 的字节码指令； 在栈帧 B 里面也有一个名字为 name 的变量，但由于执行环境、或者说栈帧的不同，name 指向的对象也不同； 一旦函数 some_func 的字节码指令全部执行完毕，那么会将当前的栈帧 B 销毁（也可以保留），再回到调用者的栈帧中来。就像是递归一样，每当调用函数时，就会在当前栈帧之上创建一个新的栈帧，一层一层创建，一层一层返回；","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧：虚拟机的执行环境","id":"238","title":"栈帧：虚拟机的执行环境"},"239":{"body":"不难发现，Python 虚拟机执行字节码这个过程，就是在模拟操作系统运行可执行文件。比如： 程序加载 操作系统：加载可执行文件到内存，设置程序计数器。 Python 虚拟机：加载 .pyc 文件中的 PyCodeObject 对象，初始化字节码指令指针。 内存管理 操作系统：为进程分配内存空间，管理堆和栈。 Python 虚拟机：创建和管理 Python 对象，处理内存分配和垃圾回收。 指令执行 操作系统：CPU 逐条执行机器指令。 Python 虚拟机：虚拟机逐条执行字节码指令。 资源管理 操作系统：管理文件句柄、网络连接等系统资源。 Python 虚拟机：管理文件对象、套接字等 Python 级别的资源。 异常处理 操作系统：处理硬件中断和软件异常。 Python 虚拟机：捕获和处理 Python 异常。 我们简单地画一张示意图，来看看在一台普通的 x64 机器上，可执行文件是以什么方式运行的，在这里主要关注栈帧的变化。假设有三个函数，函数 f 调用了函数 g，函数 g 又调用了函数 h。 首先 CPU 有两个关键的寄存器，它们在函数调用和栈帧管理中扮演关键角色。 RSP（Stack Pointer）：栈指针，指向当前栈帧的顶部，或者说最后一个入栈的元素。因此随着元素的入栈和出栈，RSP 会动态变化。由于地址从栈底到栈顶是逐渐减小的，所以 RSP 会随着数据入栈而减小，随着数据出栈而增大。当然不管 RSP 怎么变，它始终指向当前栈的顶部。 RBP（Base Pointer）：基指针，指向当前栈帧的基址，它的作用是提供一个固定的参考点，用于访问当前函数的局部变量和参数。当新的帧被创建时，它的基址会保存上一个帧的基址，并由 RBP 指向。 我们用一段 C 代码来解释一下。 #include <stdio.h> int add(int a, int b) { int c = a + b; return c;\n} int main() { int a = 11; int b = 22; int result = add(a, b); printf(\"a + b = %d\\n\", result);\n} 当执行函数 main 的时候，RSP 指向 main 栈帧的顶部，RBP 指向 main 栈帧的基址。然后在 main 里面又调用了函数 add，那么毫无疑问，系统会在地址空间中，在 main 的栈帧之上为 add 创建栈帧。然后让 RSP 指向 add 栈帧的顶部，RBP 指向 add 栈帧的基址，而 add 栈帧的基址保存了上一级栈帧（main 栈帧）的基址。 当函数 add 执行结束时，会销毁对应栈帧，再将 RSP 和 RBP 恢复为创建 add 栈帧之前的值，这样程序的执行流程就又回到了函数 main 里面，当然程序的运行空间也回到了函数 main 的栈帧中。 不难发现，通过两个 CPU 寄存器 RSP、RBP，以及栈帧中保存的上一级栈帧的基址，完美地维护了函数之间的调用链，这就是可执行文件在 x64 机器上的运行原理。 那么 Python 里面的栈帧是怎样的呢？","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 虚拟机和操作系统","id":"239","title":"虚拟机和操作系统"},"24":{"body":"Python 中有两个类型对象比较特殊，一个是站在类型金字塔顶端的 type，另一个是站在继承金字塔顶端的 object。看完了 type，再来看看 object。 由于 object 的类型是 type，那么在初始化 PyBaseObject_Type 的时候，它的 ob_type 一定也被设置成了 &PyType_Type。 我们看一下 PyBaseObject_Type 的具体实现，它同样定义在 Objects/typeobject.c 中。 类型对象在创建的时候，ob_type 字段都会被初始化成 &PyType_Type，而 object 也不例外，所以它的类型为 type，这个非常简单。但 type 的基类是 object，又是怎么一回事呢？ 之前介绍类型对象的时候，我们说类型对象内部的 tp_base 指向继承的基类，那么对于 PyType_Type 来讲，它内部的 tp_base 肯定是 &PyBaseObject_Type，即 object。 但令我们吃鲸的是，它的 tp_base 居然是个 0，也就是说基类为空。 在 C 中，将指针变量赋值为 0 和赋值为 NULL 是等价的，因为 NULL 就是值为 0 的指针常量。 不是说 type 的基类是 object 吗？为啥 tp_base 是 0 呢。事实上如果你去看其它类型的话，会发现它们内部的 tp_base 也是 0。为 0 的原因就在于我们目前看到的类型对象还不够完善，因为 Python 的动态性，显然不可能在定义的时候就将所有字段属性都设置好、然后解释器一启动就得到我们平时使用的类型对象。 因此目前看到的类型对象还不是最终形态，有一部分字段属性是在解释器启动之后再动态完善的，而这个完善的过程被称为类型对象的初始化，它由函数 PyType_Ready 负责。 // Objects/typeobject.c int\nPyType_Ready(PyTypeObject *type)\n{ // ... // 注意这里的 type 是一个 C 函数的参数，不是 Python 里的 <class 'type'> // 获取类型对象的基类（指针） base = type->tp_base; // 如果类型对象的 tp_base 为空，并且本身也不是 &PyBaseObject_Type // 那么就将它的 tp_base 设置为 &PyBaseObject_Type if (base == NULL && type != &PyBaseObject_Type) { base = type->tp_base = &PyBaseObject_Type; Py_INCREF(base); } // ...\n} 当解释器发现类对象还没有初始化时，会将其作为参数传递给 PyType_Ready，进行初始化。 初始化过程会做很多的工作，用于完善类型对象，而其中一项工作就是设置基类。如果发现类型对象的基类为空，那么就将基类设置为 object，因为在 Python3 里面新式类都要继承 object。当然啦，这个类不能是 object 本身，object 的基类是 None，因为继承链向上要有一个终点。 当 PyType_Ready 完成初始化之后，就得到我们平常使用的类型对象了，最终 PyType_Type 和 PyBaseObject_Type 的关系如下。 因此到目前为止，type 和 object 之间的恩怨纠葛算是真相大白了，总结一下： 1）和自定义类不同，内置的类不是由 type 实例化得到的，它们都是在底层预先定义好的，不存在谁创建谁。只是内置的类在定义的时候，它们的类型都被设置成了 type。这样不管是内置的类，还是自定义类，在调用时都可以执行 type 的 __call__ 函数，从而让它们的行为是一致的。 2）虽然内置的类在底层预定义好了，但还有一些瑕疵，因为有一部分逻辑无法以源码的形式体现，只能在解释器启动的时候再动态完善。而这个完善的过程，便包含了基类的填充，会将基类设置成 object。 所以 type 和 object 是同时出现的，它们的存在需要依赖彼此。首先这两者会以不完全体的形式定义在源码中，并且在定义的时候将 object 的类型设置成 type；然后当解释器启动的时候，再经过动态完善，进化成完全体，而进化的过程中会将 type 的基类设置成 object。 因此 object 的类型是 type，type 继承 object 就是这么来的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的基类：PyBaseObject_Type","id":"24","title":"类型对象的基类：PyBaseObject_Type"},"240":{"body":"相较于 x64 机器上看到的那个简简单单的栈帧，Python 的栈帧实际上包含了更多的信息。注：栈帧也是一个对象。 // Include/frameobject.h typedef struct _frame { PyObject_VAR_HEAD struct _frame *f_back; PyCodeObject *f_code; PyObject *f_builtins; PyObject *f_globals; PyObject *f_locals; PyObject **f_valuestack; PyObject **f_stacktop; PyObject *f_trace; char f_trace_lines; char f_trace_opcodes; PyObject *f_gen; int f_lasti; int f_lineno; int f_iblock; char f_executing; PyTryBlock f_blockstack[CO_MAXBLOCKS]; PyObject *f_localsplus[1];\n} PyFrameObject; 下面来解释一下里面的每个字段都是啥含义，不过在解释之前，我们要先知道如何在 Python 中获取栈帧对象。 import inspect def foo(): # 返回当前所在的栈帧 # 这个函数实际上是调用了 sys._getframe(1) return inspect.currentframe() frame = foo()\nprint(frame) \"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\nprint(type(frame)) \"\"\"\n<class 'frame'>\n\"\"\" 我们看到栈帧的类型是 <class 'frame'>，正如 PyCodeObject 对象的类型是 <class 'code'> 一样，这两个类没有暴露给我们，所以不可以直接使用。 同理，还有 Python 的函数，类型是 <class 'function'>，模块的类型是 <class 'module'>。这些解释器都没有给我们提供，如果直接使用的话，那么 frame、code、function、module 只是几个没有定义的变量罢了，这些类我们只能通过这种间接的方式获取。 下面来看一下 PyFrameObject 里面每个字段的含义。 PyObject_VAR_HEAD 变长对象的头部信息，所以栈帧也是一个对象。 struct _frame *f_back 当前栈帧的上一级栈帧，也就是调用者的栈帧。所以 x64 机器是通过 RSP、RBP 两个指针维护函数的调用关系，而 Python 虚拟机则是通过栈帧的 f_back 字段。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame)\n\"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\n# foo 的上一级栈帧，显然对应的是模块的栈帧\nprint(frame.f_back)\n\"\"\"\n<frame at 0x100adde40, file '.../main.py', line 12, code <module>>\n\"\"\"\n# 相当于模块的上一级栈帧，显然是 None\nprint(frame.f_back.f_back)\n\"\"\"\nNone\n\"\"\" 因此通过栈帧，可以轻松地获取完整的函数调用链路，我们一会儿演示。 PyCodeObject *f_code 栈帧对象是在 PyCodeObject 之上构建的，所以它内部一定有一个字段指向 PyCodeObject，而该字段就是 f_code。 import inspect def e(): f() def f(): g() def g(): h() def h(): frame = inspect.currentframe() # 获取栈帧 func_names = [] # 只要 frame 不为空，就一直循环，并将函数名添加到列表中 while frame is not None: func_names.append(frame.f_code.co_name) frame = frame.f_back print(f\"函数调用链路：{' -> '.join(func_names[:: -1])}\") f()\n\"\"\"\n函数调用链路：<module> -> f -> g -> h\n\"\"\" 模块 -> f -> g -> h，显然我们获取了整个调用链路，是不是很有趣呢？ PyObject *f_builtins、*f_gloabls、*f_locals 这三者均表示名字空间，其中 f_gloabls 指向全局名字空间（一个字典），它是全局变量的容身之所。是的，Python 的全局变量是通过字典存储的，调用函数 globals 即可拿到该字典。 # 等价于 name = \"古明地觉\"\nglobals()[\"name\"] = \"古明地觉\" # 等价于 print(name)\nprint(globals()[\"name\"]) # 古明地觉 def foo(): import inspect return inspect.currentframe() frame = foo()\n# frame.f_globals 同样会返回全局名字空间\nprint(frame.f_globals is globals()) # True\n# 相当于创建了一个全局变量 age\nframe.f_globals[\"age\"] = 18\nprint(age) # 18 关于名字空间，我们后面会用专门的篇幅详细说明。 然后 f_locals 指向局部名字空间（一个字典），但和全局变量不同，局部变量不存在局部名字空间中，而是静态存储在数组中。该字段先有个印象，后续再详细说。 f_builtins 指向内置名字空间（一个字典），显然一些内置的变量都存在里面。 def foo(): import inspect return inspect.currentframe() frame = foo()\nprint(frame.f_builtins[\"list\"](\"abcd\"))\n\"\"\"\n['a', 'b', 'c', 'd']\n\"\"\" 和我们直接使用 list(\"abcd\") 是等价的。 PyObject **f_valuestack 指向运行时栈的栈底，关于什么是运行时栈，后续详细说明。 PyObject **f_stacktop 指向运行时栈的栈顶。 PyObject *f_trace 追踪函数，用于调试。 char f_trace_lines 是否为每一行代码调用追踪函数，当设置为真（非零值）时，每当虚拟机执行到一个新的代码行时，都会调用追踪函数。这允许调试器在每行代码执行时进行干预，比如设置断点、检查变量等。 char f_trace_opcodes 是否为每个字节码指令调用追踪函数，当设置为真时，虚拟机会在执行每个字节码指令之前调用追踪函数。这提供了更细粒度的控制，允许进行指令级别的调试。 所以不难发现，f_trace_lines 是行级追踪，对应源代码的每一行，通常用于普通的调试，如设置断点、单步执行等，并且开销相对较小。f_trace_opcodes 是指令级追踪，对应每个字节码指令，通常用于更深层次的调试，比如分析具体的字节码执行过程，并且开销较大。 import sys def trace_lines(frame, event, arg): print(f\"行号：{frame.f_lineno}，文件名：{frame.f_code.co_filename}\") return trace_lines sys.settrace(trace_lines) 设置追踪函数一般需要通过 sys.settrace，不过不常用，了解一下即可。 PyObject *f_gen 是否是基于生成器的 PyCodeObject 构建的栈帧。 int f_lasti 上一条已执行完毕的指令在指令序列中的偏移量。 int f_lineno 获取该栈帧时的源代码行号。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame.f_lineno) # 4 我们是在第 4 行获取的栈帧，所以打印结果是 4。 int f_iblock 用于跟踪 try / except / finally 代码块的层级深度，它记录了当前栈帧中活跃的 try 语句块的数量，每进入一个新的 try 语句块时加 1，离开 try 语句块时减 1。 try: # f_iblock = 1 try: # f_iblock = 2 pass except: pass except: # f_iblock = 1 pass\nfinally: # f_iblock = 0 pass f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。 char f_executing 当前栈帧是否仍在执行。 PyTryBlock f_blockstack[CO_MAXBLOCKS] 一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？ SETUP_LOOP：循环块（for / while） SETUP_EXCEPT：try / except 块 SETUP_FINALLY：try / finally 块 SETUP_WITH：with 语句块 SETUP_ASYNC_WITH：async with 语句块 PyObject *localsplus[1] 一个柔性数组，负责维护 \"局部变量 + cell 变量 + free 变量 + 运行时栈\"，大小在运行时确定。 以上就是栈帧内部的字段，这些字段先有个印象，后续在剖析虚拟机的时候还会继续细说。 总之我们看到，PyCodeObject 并不是虚拟机的最终目标，虚拟机最终是在栈帧中执行的。每一个栈帧都会维护一个 PyCodeObject 对象，换句话说，每一个 PyCodeObject 对象都会隶属于一个栈帧。并且从 f_back 可以看出，虚拟机在实际执行时，会产生很多的栈帧对象，而这些对象会被链接起来，形成一条执行环境链表，或者说栈帧链表。 而这正是 x64 机器上栈帧之间关系的模拟，在 x64 机器上，栈帧之间通过 RSP 和 RBP 指针建立了联系，使得新栈帧在结束之后能够顺利地返回到旧栈帧中，而 Python 虚拟机则是利用 f_back 来完成这个动作。 当然，获取栈帧除了通过 inspect 模块之外，在捕获异常时，也可以获取栈帧。 def foo(): try: 1 / 0 except ZeroDivisionError: import sys # exc_info 返回一个三元组 # 分别是异常的类型、值、以及 traceback exc_type, exc_value, exc_tb = sys.exc_info() print(exc_type) # <class 'ZeroDivisionError'> print(exc_value) # division by zero print(exc_tb) # <traceback object at 0x00000135CEFDF6C0> # 调用 exc_tb.tb_frame 即可拿到异常对应的栈帧 # 另外这个 exc_tb 也可以通过下面这种方式获取 # except ZeroDivisionError as e; e.__traceback__ print(exc_tb.tb_frame.f_code.co_name) # foo print(exc_tb.tb_frame.f_back.f_code.co_name) # <module> # 显然 tb_frame 是当前函数 foo 的栈帧 # 那么 tb_frame.f_back 就是整个模块对应的栈帧 # 而 tb_frame.f_back.f_back 显然就是 None 了 print(exc_tb.tb_frame.f_back.f_back) # None foo() 关于栈帧内部的字段的含义，我们就说完了。当然如果有些字段现在不是很理解，也没关系，随着不断地学习，你会豁然开朗。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧的底层结构","id":"240","title":"栈帧的底层结构"},"241":{"body":"因为很多动态信息无法静态地存储在 PyCodeObject 对象中，所以 PyCodeObject 对象在交给虚拟机之后，虚拟机会在其之上动态地构建出 PyFrameObject 对象，也就是栈帧。 因此虚拟机是在栈帧里面执行的字节码，它包含了虚拟机在执行字节码时依赖的全部信息。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 小结","id":"241","title":"小结"},"242":{"body":"在介绍栈桢的时候，我们看到了 3 个独立的名字空间：f_locals、f_globals、f_builtins。名字空间对 Python 来说是一个非常重要的概念，虚拟机的运行机制和名字空间有着非常紧密的联系。并且在 Python 中，与名字空间这个概念紧密联系在一起的还有名字、作用域这些概念，下面我们就来剖析这些概念是如何体现的。","breadcrumbs":"55. 名字空间：变量的容身之所 » 楔子","id":"242","title":"楔子"},"243":{"body":"在这个系列的最开始我们就说过，从解释器的角度来看，变量只是一个泛型指针 PyObject *，而从 Python 的角度来看，变量只是一个名字、或者说符号，用于和对象进行绑定的。 name = \"古明地觉\" 上面这个赋值语句其实就是将 name 和 \"古明地觉\" 绑定起来，让我们可以通过 name 这个符号找到对应的 PyUnicodeObject。因此定义一个变量，本质上就是建立名字和对象之间的映射关系。 另外我们说 Python 虽然一切皆对象，但拿到的都是指向对象的指针，因此创建函数和类，以及模块导入，同样是在完成名字和对象的绑定。 def foo(): pass class A(): pass 创建一个函数也相当于定义一个变量，会先根据函数体创建一个函数对象，然后将名字 foo 和函数对象绑定起来。所以函数名和函数体之间是分离的，同理类也是如此。 import os 导入一个模块，也是在定义一个变量。import os 相当于将名字 os 和模块对象绑定起来，通过 os 可以找到指定的模块对象。 当我们导入一个模块的时候，解释器是这么做的。 import os 等价于 os = __import__(\"os\")，可以看到本质上还是一个赋值语句。 import numpy as np 中的 as 语句同样是在定义变量，将名字 np 和对应的模块对象绑定起来，以后就可以通过 np 这个名字去获取指定的模块了。 总结：无论是普通的赋值语句，还是定义函数和类，亦或是模块导入，它们本质上都是在完成变量和对象的绑定。 name = \"古明地觉\" def foo(): pass class A(): pass import os\nimport numpy as np 里面的 name、foo、A、os、np，都只是一个变量，或者说名字、符号，然后通过名字可以获取与之绑定的对象。","breadcrumbs":"55. 名字空间：变量的容身之所 » 变量只是一个名字","id":"243","title":"变量只是一个名字"},"244":{"body":"正如上面所说，赋值语句、函数定义、类定义、模块导入，本质上只是完成了变量和对象之间的绑定，或者说我们创建了变量到对象的映射，通过变量可以获取对应的对象，而它们的容身之所就是名字空间。 所以名字空间是通过 PyDictObject 对象实现的，这对于映射来说简直再适合不过了。而前面介绍字典的时候，我们说字典是被高度优化的，原因就是虚拟机本身也重度依赖字典，从这里的名字空间即可得到体现。 当然，在一个模块内部，变量还存在可见性的问题，比如： x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 我们看到同一个变量名，打印的确是不同的值，说明指向了不同的对象，换句话说这两个变量是在不同的名字空间中被创建的。 名字空间本质上是一个字典，如果两者在同一个名字空间，那么由于 key 的不重复性，当执行 x = 2 的时候，会把字典里面 key 为 \"x\" 的 value 给更新成 2。但是在外面还是打印 1，这说明两者所在的不是同一个名字空间，打印的也就自然不是同一个 x。因此对于一个模块而言，内部可以存在多个名字空间，每一个名字空间都与一个作用域相对应。作用域可以理解为一段程序的正文区域，在这个区域里面定义的变量是有意义的，然而一旦出了这个区域，就无效了。 关于作用域这个概念，我们要记住：它仅仅是由源代码的文本所决定。在 Python 中，一个变量在某个位置是否起作用，是由它的文本位置决定的。 因此 Python 具有静态作用域（词法作用域），而名字空间则是作用域的动态体现，一个由程序文本定义的作用域在运行时会转化为一个名字空间、即一个 PyDictObject 对象。比如进入一个函数，显然会进入一个新的作用域，因此函数在执行时，会创建一个名字空间。 在介绍 PyCodeObject 的时候，我们说解释器在对源代码进行编译的时候，对于代码中的每一个 code block，都会创建一个 PyCodeObject 对象与之对应。而当进入一个新的名字空间、或者说作用域时，就算是进入一个新的 block 了。 而根据我们使用 Python 的经验，显然函数、类都是一个新的 block，解释器在执行的时候会为它们创建各自的名字空间。 所以名字空间是名字、或者说变量的上下文环境，名字的含义取决于名字空间。更具体的说，一个变量绑定的对象是不确定的，需要由名字空间来决定。位于同一个作用域的代码可以直接访问作用域中出现的名字，即所谓的直接访问；但不同的作用域，则需要通过访问修饰符 . 进行属性访问。 class A: x = 1 class B: y = 2 print(A.x) # 1 print(y) # 2 如果想在 B 里面访问 A 里面的内容，要通过 A.属性的方式，表示通过 A 来获取 A 里面的属性。但是访问 B 的内容就不需要了，因为都是在同一个作用域，所以直接访问即可。 访问名字这样的行为被称为名字引用，名字引用的规则决定了 Python 程序的行为。 x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 还是上面的代码，如果我们把函数里面的 x = 2 给删掉，意味着函数的作用域里面已经没有 x 这个变量了，那么再执行程序会有什么结果呢？从 Python 层面来看，显然是会寻找外部的 x。因此我们可以得到如下结论： 作用域是层层嵌套的； 内层作用域可以访问外层作用域； 外层作用域无法访问内层作用域，如果是把外层的 x = 1 给去掉，那么最后面的 print(x) 铁定报错； 查找元素会依次从当前作用域向外查找，也就是查找元素时，对应的作用域是按照从小往大、从里往外的方向前进的；","breadcrumbs":"55. 名字空间：变量的容身之所 » 作用域和名字空间","id":"244","title":"作用域和名字空间"},"245":{"body":"不光函数、类有自己的作用域，模块对应的源文件本身也有相应的作用域。比如： name = \"古明地觉\"\nage = 16 def foo(): return 123 class A: pass 这个文件本身也有自己的作用域，并且是 global 作用域，所以解释器在运行这个文件的时候，也会为其创建一个名字空间，而这个名字空间就是 global 名字空间，即全局名字空间。它里面的变量是全局的，或者说是模块级别的，在当前文件的任意位置都可以直接访问。 而 Python 也提供了 globals 函数，用于获取 global 名字空间。 name = \"古明地觉\" def foo(): pass print(globals())\n\"\"\"\n{..., 'name': '古明地觉', 'foo': <function foo at 0x0000015255143E20>}\n\"\"\" 里面的 ... 表示省略了一部分输出，我们看到创建的全局变量就在里面。而且 foo 也是一个全局变量，它指向一个函数对象。 注意：我们说函数内部是一个独立的 block，因此它会对应一个 PyCodeObject。然后在解释到 def foo 的时候，会根据 PyCodeObject 对象创建一个 PyFunctionObject 对象，然后将 foo 和这个函数对象绑定起来。 当后续调用 foo 的时候，再根据 PyFunctionObject 对象创建 PyFrameObject 对象、然后执行，至于具体细节留到介绍函数的时候再细说。总之，我们看到 foo 也是一个全局变量，全局变量都在 global 名字空间中。并且 global 名字空间全局唯一，它是程序运行时的全局变量和与之绑定的对象的容身之所。你在任何一个位置都可以访问到 global 名字空间，正如你在任何一个位置都可以访问全局变量一样。 另外我们思考一下，global 名字空间是一个字典，全局变量和对象会以键值对的形式存在里面。那如果我手动地往 global 名字空间里面添加一个键值对，是不是也等价于定义一个全局变量呢？ globals()[\"name\"] = \"古明地觉\"\nprint(name) # 古明地觉 def foo1(): def foo2(): def foo3(): globals()[\"age\"] = 16 return foo3 return foo2 foo1()()()\nprint(age) # 16 我们看到确实如此，往 global 名字空间里面插入一个键值对完全等价于定义一个全局变量。并且 global 名字空间是唯一的，你在任何地方调用 globals() 得到的都是 global 名字空间，正如你在任何地方都可以访问到全局变量一样。 所以即使是在函数中给 global 名字空间添加一个键值对，也等价于定义一个全局变量。 问题来了，如果在函数里面，我们不获取 global 名字空间，怎么创建全局变量呢？ name = \"古明地觉\" def foo(): global name name = \"古明地恋\" print(name) # 古明地觉\nfoo()\nprint(name) # 古明地恋 很简单，Python 为我们准备了 global 关键字，表示声明的变量是全局的。","breadcrumbs":"55. 名字空间：变量的容身之所 » global 名字空间","id":"245","title":"global 名字空间"},"246":{"body":"像函数和类拥有的作用域，我们称之为 local 作用域，在运行时会对应 local 名字空间，即局部名字空间。由于不同的函数具有不同的作用域，所以局部名字空间可以有很多个，但全局名字空间只有一个。 对于 local 名字空间来说，它也对应一个字典，显然这个字典就不是全局唯一的了。而如果想获取局部名字空间，Python 也提供了 locals 函数。 def foo(): name = \"古明地觉\" age = 17 return locals() def bar(): name = \"雾雨魔理沙\" age = 18 return locals() print(locals() == globals()) # True\nprint(foo()) # {'name': '古明地觉', 'age': 17}\nprint(bar()) # {'name': '雾雨魔理沙', 'age': 18} 对于模块来讲，它的 local 名字空间和 global 名字空间是一样的，也就是说，模块对应的栈桢对象里面的 f_locals 和 f_globals 指向的是同一个 PyDictObject 对象。但对于函数而言，局部名字空间和全局名字空间就不一样了，调用 locals() 是获取自身的局部名字空间，而不同函数的局部名字空间是不同的。但是 globals() 函数的调用结果是一样的，获取的都是全局名字空间，这也符合函数内不存在指定变量的时候会去找全局变量这一结论。 注：关于 local 名字空间，还有一个重要的细节，全局变量会存储在 global 名字空间中，但局部变量却并不存储在 local 名字空间中。函数有哪些局部变量在编译的时候就已经确定了，会被静态存储在数组中，关于这一点，后续会单独详细说明。","breadcrumbs":"55. 名字空间：变量的容身之所 » local 名字空间","id":"246","title":"local 名字空间"},"247":{"body":"Python 有一个所谓的 LGB 规则，指的是在查找一个变量时，会按照自身的 local 空间、外层的 global 空间、内置的 builtin 空间的顺序进行查找。 builtin 名字空间也是一个字典，当 local 名字空间、global 名字空间都查找不到指定变量的时候，会去 builtin 空间查找。而关于 builtin 空间的获取，Python 提供了一个模块。 # 等价于 __builtins__\nimport builtins\nprint(builtins is __builtins__) # True\nprint(builtins) # <module 'builtins' (built-in)> builtins 是一个模块，那么 builtins.__dict__ 便是 builtin 名字空间，也叫内置名字空间。 import builtins # builtins.list 表示从 builtin 名字空间中查找 list\n# 它等价于 builtins.__dict__[\"list\"]\n# 而如果只写 list，那么由于 local 空间、global 空间都没有\n# 因此最终还是会从 builtin 空间中查找\n# 但如果是 builtins.list，那么就不兜圈子了\n# 表示：\"builtin 空间，就从你这里获取了\"\nprint(builtins.list is list) # True # 将 builtin 空间的 dict 改成 123\nbuiltins.dict = 123\n# 那么此时获取的 dict 就是 123\nprint(dict + 456) # 579 # 如果是 str = 123，等价于创建全局变量 str = 123\nstr = 123\n# 显然影响的是 global 空间\nprint(str) # 123\n# builtin 空间则不受影响\nprint(builtins.str) # <class 'str'>\nprint(builtins.__dict__[\"str\"]) # <class 'str'> 这里提一下在 Python2 中，while 1 比 while True 要快，为什么？ 因为 True 在 Python2 中不是关键字，所以它是可以作为变量名的。那么虚拟机在执行的时候就要先看 local 空间和 global 空间里有没有 True 这个变量，有的话使用我们定义的，没有的话再使用内置的 True。 而 1 是一个常量，直接加载就可以，所以 while True 多了符号查找这一过程。但是在 Python3 中两者就等价了，因为 True 在 Python3 中是一个关键字，也会直接作为一个常量来加载。","breadcrumbs":"55. 名字空间：变量的容身之所 » builtin 名字空间","id":"247","title":"builtin 名字空间"},"248":{"body":"记得之前介绍 exec 和 eval 的时候，我们说这两个函数里面还可以接收第二个参数和第三个参数，它们分别表示 global 名字空间、local 名字空间。 # 如果不指定，默认是当前所在的名字空间\n# 显然此时是全局名字空间\nexec(\"name = '古明地觉'\")\nprint(name) # 古明地觉 # 但我们也可以指定某个名字空间\nnamespace = {}\n# 比如将 namespace 作为全局名字空间\n# 另外这里没有指定第三个参数，也就是局部名字空间\n# 如果指定了第二个参数，但没有指定第三个参数\n# 那么第三个参数默认和第二个参数保持一致\nexec(\"name = 'satori'\", namespace)\nprint(namespace[\"name\"]) # satori 至于 eval 也是同理： namespace = {\"seq\": [1, 2, 3, 4, 5]}\ntry: print(eval(\"sum(seq)\"))\nexcept NameError as e: print(e) # name 'seq' is not defined\n# 告诉我们 seq 没有被定义\n# 如果将 namespace 作为名字空间\nprint(eval(\"sum(seq)\", namespace)) # 15 所以名字空间本质上就是一个字典，所谓的变量不过是字典里面的一个 key。为了进一步加深印象，再举个模块的例子： # 我们自定义一个模块吧\n# 首先模块也是一个对象，类型为 <class 'module'>\n# 但底层没有将这个类暴露给我们，所以需要换一种方式获取\nimport sys\nModuleType = type(sys) # 以上就拿到了模块的类型对象，调用即可得到模块对象\n# 这里我们自定义一个类，继承 ModuleType\nclass MyModule(ModuleType): def __init__(self, module_name): self.module_name = module_name super().__init__(module_name) # 也可以定义一些其它的属性 def __str__(self): return f\"<module '{self.module_name}' from '虚无之境'>\" my_module = MyModule(\"自定义模块\")\nprint(my_module)\n\"\"\"\n<module '自定义模块' from '虚无之境'>\n\"\"\" # 此时的 my_module 啥也没有，我们为其添砖加瓦\nmy_module.__dict__[\"name\"] = \"古明地觉\"\nprint(my_module.name) # 古明地觉 # 给模块设置属性，本质上也是操作模块的属性字典，当然获取属性也是如此\n# 如果再和 exec 结合的话\ncode_string = \"\"\"\nage = 16\ndef foo(): return \"我是函数 foo\" from functools import reduce \"\"\"\n# 将属性设置在模块的属性字典里面\nexec(code_string, my_module.__dict__)\n# 然后我们获取它\nprint(my_module.age) # 16\nprint(my_module.foo()) # 我是函数 foo\nprint(my_module.reduce(int.__add__, range(101))) # 5050 # 是不是很神奇呢？由于 my_module 是一个模块对象\n# 我们还可以将它注入到 sys.modules 中，然后通过 import 获取\nsys.modules[\"俺滴模块\"] = my_module\nfrom 俺滴模块 import name, age, foo\nprint(name) # 古明地觉\nprint(age) # 16\nprint(foo()) # 我是函数 foo 怎么样，是不是很有意思呢？相信你对名字空间已经有了足够清晰的认识，它是变量和与之绑定的对象的容身之所。","breadcrumbs":"55. 名字空间：变量的容身之所 » exec 和 eval","id":"248","title":"exec 和 eval"},"249":{"body":"名字空间是 Python 的灵魂，它规定了一个变量应该如何查找，关于变量查找，下一篇文章来详细介绍，到时你会对名字空间有更加透彻的理解。 然后是作用域，所谓名字空间其实就是作用域的动态体现。整个 py 文件是一个作用域，也是全局作用域；定义函数、定义类、定义方法，又会创建新的作用域，这些作用域层层嵌套。那么同理，运行时的名字空间也是层层嵌套的，形成一条名字空间链。内层的变量对外层是不可见的，但外层的变量对内层是可见的。 然后全局名字空间是一个字典，它是唯一的，操作里面的键值对等价于操作全局变量；至于局部名字空间则不唯一，每一个函数都有自己的局部名字空间，但我们要知道函数内部在访问局部变量的时候是静态访问的（相关细节后续聊）。 还有内置名字空间，可以通过 __builtins__ 获取，但拿到的是一个模块，再获取它的属性字典，那么就是内置名字空间了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"55. 名字空间：变量的容身之所 » 小结","id":"249","title":"小结"},"25":{"body":"至此，我们算是从解释器的角度完全理清了 Python 中对象之间的关系，用之前的一张图总结一下。 当然，目前还远远没有结束，后续还会针对内置的对象进行专门的剖析，如浮点数、整数、字符串、字节串、元组、列表、字典、集合等等，都会一点一点剖析。我们会从 Python 的角度介绍对象该怎么用，然后再看它的底层实现，最后再用 Python 代码进行验证，加深理解。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 小结","id":"25","title":"小结"},"250":{"body":"上一篇文章我们介绍了名字空间，并且知道了全局变量都存在 global 名字空间中，往 global 空间添加一个键值对相当于定义一个全局变量。那么问题来了，如果往函数的 local 空间里面添加一个键值对，是不是也等价于创建了一个局部变量呢？ def foo(): locals()[\"name\"] = \"古明地觉\" try: print(name) except Exception as e: print(e) foo() # name 'name' is not defined 全局变量的创建是通过向字典添加键值对实现的，因为全局变量会一直变，需要使用字典来动态维护。 但对于函数来讲，内部的变量是通过静态方式存储和访问的，因为局部作用域中存在哪些变量在编译的时候就已经确定了，我们通过 PyCodeObject 的 co_varnames 即可获取内部都有哪些变量。 所以，虽然我们说变量查找遵循 LGB 规则，但函数内部的变量其实是静态访问的，不过完全可以按照 LGB 的方式理解。关于这方面的细节，后续还会细说。 因此名字空间是 Python 的灵魂，它规定了变量的作用域，使得 Python 对变量的查找变得非常清晰。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 楔子","id":"250","title":"楔子"},"251":{"body":"LGB 是针对 Python2.2 之前的，而从 Python2.2 开始，由于引入了嵌套函数，所以内层函数在找不到某个变量时应该先去外层函数找，而不是直接就跑到 global 空间里面找，那么此时的规则就是 LEGB。 x = 1 def foo(): x = 2 def bar(): print(x) return bar foo()()\n\"\"\"\n2\n\"\"\" 调用了内层函数 bar，如果按照 LGB 的规则来查找的话，由于函数 bar 的作用域没有 a，那么应该到全局里面找，打印的结果是 1 才对。 但我们之前说了，作用域仅仅是由文本决定的，函数 bar 位于函数 foo 之内，所以函数 bar 定义的作用域内嵌于函数 foo 的作用域之内。换句话说，函数 foo 的作用域是函数 bar 的作用域的直接外围作用域。所以应该先从 foo 的作用域里面找，如果没有那么再去全局里面找，而作用域和名字空间是对应的，所以最终打印了 2。 另外在调用 foo() 的时候，会执行函数 foo 中的 def bar(): 语句，这个时候解释器会将 a = 2 与函数 bar 捆绑在一起，然后返回，这个捆绑起来的整体就叫做闭包。 所以：闭包 = 内层函数 + 引用的外层作用域。 而这里显示的规则就是 LEGB，其中 E 表示 Enclosing，代表直接外围作用域。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » LEGB 规则","id":"251","title":"LEGB 规则"},"252":{"body":"在初学 Python 时，估计很多人都会对下面的问题感到困惑。 x = 1 def foo(): print(x) foo()\n\"\"\"\n1\n\"\"\" 首先这段代码打印 1，这显然是没有问题的，不过下面问题来了。 x = 1 def foo(): print(x) x = 2 foo() 这段代码在执行 print(x) 的时候是会报错的，会抛出一个 UnboundLocalError: local variable 'x' referenced before assignment，意思是局部变量 x 在赋值之前就被使用了。 那么问题来了，在 print(x) 的下面加一个 x = 2，整体效果不应该是先打印全局变量 x，然后再创建一个局部变量 x 吗？为啥就报错了呢，相信肯定有人为此困惑。如果想弄明白这个错误的原因，需要深刻理解两点： 函数中的变量是静态存储、静态访问的，内部有哪些变量在编译的时候就已经确定； 局部变量在整个作用域内都是可见的； 在编译的时候，因为 x = 2 这条语句，所以知道函数中存在一个局部变量 x，那么查找的时候就会在当前局部作用域中查找，但还没来得及赋值，就 print(x) 了。换句话说，在打印 x 的时候，它还没有和某个具体的值进行绑定，所以报错：局部变量 x 在赋值之前就被使用了。 但如果没有 x = 2 这条语句则不会报错，因为知道局部作用域中不存在 x 这个变量，所以会找全局变量 x，从而打印 1。 更有趣的东西隐藏在字节码当中，我们可以通过反汇编来查看一下： import dis x = 1 def foo(): print(x) dis.dis(foo)\n\"\"\" 6 0 LOAD_GLOBAL 0 (print) 2 LOAD_GLOBAL 1 (x) 4 CALL_FUNCTION 1 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE\n\"\"\" def bar(): print(x) x = 2 dis.dis(bar) \"\"\" 19 0 LOAD_GLOBAL 0 (print) 2 LOAD_FAST 0 (x) 4 CALL_FUNCTION 1 6 POP_TOP 20 8 LOAD_CONST 1 (2) 10 STORE_FAST 0 (x) 12 LOAD_CONST 0 (None) 14 RETURN_VALUE\n\"\"\" 第二列的序号代表字节码指令的偏移量，我们看偏移量为 2 的指令，函数 foo 对应的指令是 LOAD_GLOBAL，意思是在 global 空间中查找 x。而函数 bar 的指令是 LOAD_FAST，表示在数组中静态查找 x，但遗憾的是，此时 x 还没有和某个值进行绑定。 因此结果说明 Python 采用了静态作用域策略，在编译的时候就已经知道变量藏身于何处。而且这个例子也表明，一旦函数内有了对某个变量的赋值操作，它会在整个作用域内可见，因为编译时就已经确定。换句话说，会遮蔽外层作用域中相同的名字。 我们看一下函数 foo 和函数 bar 的符号表。 x = 1 def foo(): print(x) def bar(): print(x) x = 2 print(foo.__code__.co_varnames) # ()\nprint(bar.__code__.co_varnames) # ('x',) 在编译的时候，就知道函数 bar 里面存在局部变量 x。 如果想修复这个错误，可以用之前说的 global 关键字，将变量 x 声明为全局的。 x = 1 def bar(): global x # 表示变量 x 是全局变量 print(x) x = 2 bar() # 1\nprint(x) # 2 但这样的话，会导致外部的全局变量被修改，如果不想出现这种情况，那么可以考虑直接获取全局名字空间。 x = 1 def bar(): print(globals()[\"x\"]) x = 2 bar() # 1\nprint(x) # 1 这样结果就没问题了，同样的，类似的问题也会出现在嵌套函数中。 def foo(): x = 1 def bar(): print(x) x = 2 return bar foo()() 执行内层函数 bar 的时候，print(x) 也会出现 UnboundLocalError，如果想让它不报错，而是打印外层函数中的 x，该怎么做呢？Python 同样为我们准备了一个关键字：nonlocal。 def foo(): x = 1 def bar(): # 使用 nonlocal 的时候，必须是在内层函数里面 nonlocal x print(x) x = 2 return bar foo()() # 1 如果 bar 里面是 global x，那么表示 x 是全局变量，当 foo()() 执行完毕之后，会创建一个全局变量 x = 2。但这里不是 global，而是 nonlocal，表示 x 是外部作用域中的变量，因此会打印 foo 里面的变量 x。 当然啦，既然声明为 nonlocal，那么 foo 里面的 x 肯定会受到影响。 import inspect frame = None def foo(): globals()[\"frame\"] = inspect.currentframe() x = 1 def bar(): nonlocal x # print(x) x = 2 return bar bar = foo()\n# 打印 foo 的局部变量，此时变量 x 的值为 1\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 1}\n\"\"\"\n# 调用内层函数 bar\nbar()\n# 此时 foo 的局部变量 x 的值变成了 2\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 2}\n\"\"\" 不过由于 foo 是一个函数，调用内层函数 bar 的时候，外层函数 foo 已经结束了，所以不管怎么修改它里面的变量，都无所谓了。 另外上面的函数只嵌套了两层，即使嵌套很多层也是可以的。 import inspect frame = None def a(): def b(): globals()[\"frame\"] = inspect.currentframe() x = 123 def c(): def d(): def e(): def f(): nonlocal x print(x) x = 456 return f return e return d return c return b b = a()\nc = b()\nd = c()\ne = d()\nf = e()\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 123}\n\"\"\"\n# 调用函数 f 的时候，打印的是函数 b 里面的变量 x\n# 当然，最后也会修改它\nf()\n\"\"\"\n123\n\"\"\"\n# 可以看到 x 变成了 456\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 456}\n\"\"\" 不难发现，在嵌套多层的情况下，会采用就近原则。如果函数 d 里面也定义了变量 x，那么函数 f 里面的 nonlocal x 表示的就是函数 d 里面的局部变量 x。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » global 表达式","id":"252","title":"global 表达式"},"253":{"body":"当我们访问某个变量时，会按照 LEGB 的规则进行查找，而属性查找也是类似的，本质上都是到名字空间中查找一个名字所引用的对象。但由于属性查找限定了范围，所以要更简单，比如 a.xxx，就是到 a 里面去找属性 xxx，这个规则是不受 LEGB 作用域限制的，就是到 a 里面查找，有就是有，没有就是没有。 import numpy as np # 在 np 指向的对象（模块）中查找 array 属性\nprint(np.array([1, 2, 3]))\n\"\"\"\n[1 2 3]\n\"\"\"\n# 本质上就是去 np 的属性字典中查找 key = \"array\" 对应的 value\nprint(np.__dict__[\"array\"]([11, 22, 33]))\n\"\"\"\n[11 22 33]\n\"\"\" class Girl: name = \"古明地觉\" age = 16 print(Girl.name, Girl.age)\n\"\"\"\n古明地觉 16\n\"\"\"\nprint(Girl.__dict__[\"name\"], Girl.__dict__[\"age\"])\n\"\"\"\n古明地觉 16\n\"\"\" 需要补充一点，我们说属性查找会按照 LEGB 规则，但这必须限制在自身所在的模块内，如果是多个模块就不行了。举个例子，假设有两个 py 文件，内容如下： # girl.py\nprint(name) # main.py\nname = \"古明地觉\"\nfrom girl import name 关于模块的导入我们后续会详细说，总之执行 main.py 的时候报错了，提示变量 name 没有被定义，但问题是 main.py 里面定义了变量 name，为啥报错呢？ 很明显，因为 girl.py 里面没有定义变量 name，所以导入 girl 的时候报错了。因此结论很清晰了，变量查找虽然是 LEGB 规则，但不会越过自身所在的模块。print(name) 在 girl.py 里面，而变量 name 定义在 main.py 里面，在导入时不可能跨过 girl.py 的作用域去访问 main.py 里的 name，因此在执行 from girl import name 的时候会抛出 NameError。 虽然每个模块内部的作用域规则有点复杂，因为要遵循 LEGB；但模块与模块的作用域之间则划分得很清晰，就是相互独立。 关于模块，我们后续会详细说。总之通过属性操作符 . 的方式，本质上都是去指定的名字空间中查找对应的属性。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性查找","id":"253","title":"属性查找"},"254":{"body":"自定义的类里面如果没有 __slots__，那么这个类的实例对象会有一个属性字典，和名字空间的概念是等价的。 class Girl: def __init__(self): self.name = \"古明地觉\" self.age = 16 g = Girl()\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16} # 对于查找属性而言, 也是去属性字典中查找\nprint(g.name, g.__dict__[\"name\"]) # 古明地觉 古明地觉 # 同理设置属性, 也是更改对应的属性字典\ng.__dict__[\"gender\"] = \"female\"\nprint(g.gender) # female 当然模块也有属性字典，本质上和类的实例对象是一致的，因为模块本身就是一个实例对象。 print(__builtins__.str) # <class 'str'>\nprint(__builtins__.__dict__[\"str\"]) # <class 'str'> 另外这个 __builtins__ 位于 global 名字空间里面，然后获取 global 名字空间的 globals 又是一个内置函数，于是一个神奇的事情就出现了。 print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"] ) # <module 'builtins' (built-in)> print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"].list(\"abc\") ) # ['a', 'b', 'c'] global 名字空间和 builtin 名字空间，都保存了指向彼此的指针，所以不管套娃多少次，都是可以的。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性空间","id":"254","title":"属性空间"},"255":{"body":"整个内容很好理解，关键的地方就在于局部变量，它是静态存储的，编译期间就已经确定。而在访问局部变量时，也是基于数组实现的静态查找，而不是使用字典。 关于 local 空间，以及如何使用数组实现静态查找，我们后面还会详细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 小结","id":"255","title":"小结"},"256":{"body":"当解释器启动后，首先会进行运行时环境的初始化，注意这里的运行时环境，它和之前说的执行环境有很大不同，运行时环境是一个全局的概念，而执行环境是一个栈帧。 关于运行时环境的初始化是一个很复杂的过程，涉及到 Python 进程、线程的创建，类型对象的完善等非常多的内容，我们暂时先不讨论。这里就假设初始化动作已经完成，我们已经站在了虚拟机的门槛外面，只需要轻轻推动第一张骨牌，整个执行过程就像多米诺骨牌一样，一环扣一环地展开。 在介绍字节码的时候我们说过，解释器可以看成是：编译器+虚拟机，编译器负责将源代码编译成 PyCodeObject 对象，而虚拟机则负责执行。所以我们的重点就是虚拟机是怎么执行 PyCodeObject 对象的？整个过程是什么，掌握了这些，你对虚拟机会有一个更深的理解。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 楔子","id":"256","title":"楔子"},"257":{"body":"在介绍栈帧的时候我们说过，Python 是一门动态语言，一个变量指向什么对象需要在运行时才能确定，这些信息不可能静态存储在 PyCodeObject 对象中。所以虚拟机在运行时会基于 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。而创建栈帧，主要使用以下两个函数： // Python/ceval.c /* 基于 PyCodeObject、全局名字空间、局部名字空间，创建栈帧 * 参数非常简单，所以它一般适用于模块这种参数不复杂的场景 * 前面说了，模块也会对应一个栈帧，并且它位于栈帧链的最顶层 */\nPyObject *\nPyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)\n{ return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, (PyObject **)NULL, 0, (PyObject **)NULL, 0, NULL, NULL);\n} /* 相比 PyEval_EvalCode 多了很多的参数 * 比如里面有位置参数以及个数，关键字参数以及个数 * 还有默认参数以及个数，闭包等等，显然它用于函数等复杂场景 */\nPyObject *\nPyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, int argcount, PyObject *const *kws, int kwcount, PyObject *const *defs, int defcount, PyObject *kwdefs, PyObject *closure)\n{ return _PyEval_EvalCodeWithName(_co, globals, locals, args, argcount, kws, kws != NULL ? kws + 1 : NULL, kwcount, 2, defs, defcount, kwdefs, closure, NULL, NULL);\n} 我们看到 PyEval_EvalCode 也是调用了 PyEval_EvalCodeEx，后者是通用逻辑，只不过为模块创建栈帧时，参数非常简单，所以又封装了 PyEval_EvalCode 函数。 当然啦，上面这两个函数最终都会调用 _PyEval_EvalCodeWithName 函数，创建并初始化栈帧对象，我们来看一下该函数内部的逻辑。 // Python/ceval.c PyObject *\n_PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, Py_ssize_t argcount, PyObject *const *kwnames, PyObject *const *kwargs, Py_ssize_t kwcount, int kwstep, PyObject *const *defs, Py_ssize_t defcount, PyObject *kwdefs, PyObject *closure, PyObject *name, PyObject *qualname)\n{ PyCodeObject* co = (PyCodeObject*)_co; PyFrameObject *f; PyObject *retval = NULL; PyObject **fastlocals, **freevars; // ... // 调用 _PyFrame_New_NoTrack 函数创建栈帧 f = _PyFrame_New_NoTrack(tstate, co, globals, locals); if (f == NULL) { return NULL; } fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; // ... // 调用 PyEval_EvalFrameEx 在栈帧中执行字节码 retval = PyEval_EvalFrameEx(f,0); fail: assert(tstate != NULL); if (Py_REFCNT(f) > 1) { Py_DECREF(f); _PyObject_GC_TRACK(f); } else { ++tstate->recursion_depth; Py_DECREF(f); --tstate->recursion_depth; } return retval;\n} 这个函数的逻辑比较长，但做的事情很简单。 调用 _PyFrame_New_NoTrack 函数创建栈帧，并初始化内部字段。 栈帧创建完毕之后，里面的字段都是初始值，所以还要基于当前的 PyCodeObject 对象、位置参数、关键字参数、参数个数等信息修改栈帧字段，而省略掉的大部分代码就是在负责相关逻辑。以上这两步组合起来，就是我们之前说的基于 PyCodeObject 对象构建栈帧对象。 栈帧字段设置完毕之后，调用 PyEval_EvalFrameEx 函数，在栈帧中执行字节码。 当然，PyEval_EvalFrameEx 也不是整个流程的终点，它内部还调用了一个函数。 // Python/ceval.c PyObject *\nPyEval_EvalFrameEx(PyFrameObject *f, int throwflag)\n{ // interp 表示进程状态对象，它的 eval_frame 字段被设置为 _PyEval_EvalFrameDefault // 这个 _PyEval_EvalFrameDefault 函数便是虚拟机运行的核心，是一个代码量超级多的函数 PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE(); return interp->eval_frame(f, throwflag);\n} 所以整个流程很清晰了，我们画一张图。 所以 _PyEval_EvalFrameDefault 函数是虚拟机运行的核心，该函数较为复杂，我们会在下一篇文章中分析它的具体实现。至于本篇文章就先从宏观的角度来描述一下虚拟机执行字节码的流程，并对之前的内容做一个补充，将背后涉及的概念阐述一遍，这样后续看源码的时候也会事半功倍。 首先栈帧中有一个 f_code 字段，它指向 PyCodeObject 对象，该对象的 co_code 字段则保存着字节码指令序列。而虚拟机执行字节码就是从头到尾遍历整个 co_code，对指令逐条执行的过程。 另外也不要觉得字节码指令（简称指令）有多神秘，说白了它就是个 uint8 整数，而一个程序肯定会包含多条指令，它们整体便构成了指令集，或者说指令序列。那么显然，使用 bytes 对象来表示指令序列再合适不过了，如果站在 C 的角度，则就是一个普普通通的字符数组，一条指令就是一个字符、或者说一个整数。 当然指令序列里面包含的不仅仅是指令，还有指令参数，因为每个指令都会带一个参数。因此索引为 0 2 4 6 8 ··· 的整数表示指令，索引为 1 3 5 7 9 ··· 的整数表示指令参数。 我们用 Python 来演示一下： code_string = \"\"\"\na = 1\nb = 2\nc = a + b\n\"\"\" code_object = compile(code_string, \"<file>\", \"exec\")\n# 查看常量池\nprint(code_object.co_consts)\n\"\"\"\n(1, 2, None)\n\"\"\"\n# 查看符号表\nprint(code_object.co_names)\n\"\"\"\n('a', 'b', 'c')\n\"\"\" 这些都比较简单，再来看一下反编译的结果，直接 dis.dis(code_object) 即可。 /* 常量池：(1, 2, None) * 符号表：('a', 'b', 'c') */ // 第一列表示源代码行号\n// 第二列表示指令的偏移量\n// 第三列表示指令，在 C 中它们都是宏，对应一个整数\n// 第四列表示指令参数\n// 第五列是 dis 模块为了方便我们阅读而补充的提示信息 // 指令：LOAD_CONST，指令参数：0\n// 表示从常量池中加载索引为 0 的常量，并压入运行时栈（关于运行时栈，一会儿详细说明）\n// 索引为 0 的常量显然是 1，而括号里面的提示信息显示的也是 1\n2 0 LOAD_CONST 0 (1)\n// 指令：STORE_NAME，指令参数：0\n// 表示从符号表中加载索引为 0 的符号，显然结果是 \"a\"\n// 然后弹出运行时栈的栈顶元素，显然是上一条指令压入的 1\n// 将 \"a\" 和 1 组成键值对，存储在当前的名字空间中\n// 到此 a = 1 这条语句便完成了，或者说完成了变量和值的绑定 2 STORE_NAME 0 (a) // 从常量池中加载索引为 1 的常量（结果是 2），并压入运行时栈 3 4 LOAD_CONST 1 (2)\n// 从符号表中加载索引为 1 的符号（结果是 \"b\")\n// 然后从栈顶弹出元素 2，将 \"b\" 和 2 绑定起来 6 STORE_NAME 1 (b) // 加载符号表中索引为 0 的符号对应的值，并压入运行时栈 4 8 LOAD_NAME 0 (a)\n// 加载符号表中索引为 1 的符号对应的值，并压入运行时栈 10 LOAD_NAME 1 (b)\n// 将运行时栈的两个元素弹出，并执行加法运算\n// 运算之后，再将结果 a + b 压入运行时栈 12 BINARY_ADD\n// 从符号表中加载索引为 2 的符号，结果是 \"c\" // 将运行时栈的栈顶元素弹出，这里是 a + b 的运算结果\n// 然后进行绑定，完成 c = a + b 这条赋值语句 14 STORE_NAME 2 (c)\n// 从常量池中加载索引为 2 的元素并返回，有一个隐式的 return None 16 LOAD_CONST 2 (None) 18 RETURN_VALUE 这些指令的源码实现后续都会说，但是不难发现，程序的主干逻辑都体现在字节码中，而依赖的信息则由其它字段来维护。所谓执行源代码，其实就是虚拟机执行编译之后的字节码，通过遍历 co_code，对不同的指令执行不同的逻辑。 然后我们基于上面这些输出信息，看看能否将字节码指令集还原出来，当然在还原之前首先要知道这些指令代表的数值是多少。 下面我们来进行还原。 \"\"\" 0 LOAD_CONST 0 (1) 2 STORE_NAME 0 (a) 4 LOAD_CONST 1 (2) 6 STORE_NAME 1 (b) 8 LOAD_NAME 0 (a)\n10 LOAD_NAME 1 (b)\n12 BINARY_ADD\n14 STORE_NAME 2 (c)\n16 LOAD_CONST 2 (None)\n18 RETURN_VALUE\n\"\"\"\nBINARY_ADD = 23\nRETURN_VALUE = 83\nSTORE_NAME = 90\nLOAD_CONST = 100\nLOAD_NAME = 101 codes = [ # a = 1 LOAD_CONST, 0, STORE_NAME, 0, # b = 2 LOAD_CONST, 1, STORE_NAME, 1, # c = a + b LOAD_NAME, 0, # 加载 a LOAD_NAME, 1, # 加载 b BINARY_ADD, 0, # 计算 a + b STORE_NAME, 2, # 和变量 c 绑定 # 所有代码块都隐式地包含了一个 return None LOAD_NAME, 2, RETURN_VALUE, 0\n]\nprint(bytes(codes))\n\"\"\"\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02e\\x02S\\x00'\n\"\"\" 那么字节码是不是我们还原的这个样子呢？来对比一下。 >>> code_object.co_code\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02d\\x02S\\x00' 结果是一样的，到此相信你对 Python 源代码的执行过程应该有更深的了解了，简单来讲，其实就是以下几个步骤。 1）源代码被编译成 PyCodeObject 对象，该对象的 co_code 字段指向字节码指令序列，它包含了程序执行的主干逻辑，剩余字段则保存常量池、符号表等其它静态信息。 2）虚拟机在 PyCodeObject 对象的基础上构建栈桢对象。 3）虚拟机在栈桢对象内部执行字节码（帧评估），具体流程就是遍历指令集和，根据不同指令执行不同的处理逻辑，而这一过程便由 _PyEval_EvalFrameDefault 函数负责完成。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 虚拟机的运行框架","id":"257","title":"虚拟机的运行框架"},"258":{"body":"之前一直提到一个概念，叫运行时栈，那什么是运行时栈呢？别急，我们先来回顾一下栈桢的基本结构。 大部分字段都很好理解，因为之前通过 Python 代码演示过。但有几个字段是虚拟机用于执行指令的，后续会遇到，所以这里再拿出来解释一下。 f_lasti 上一条刚执行完的字节码指令的偏移量，因为每个指令要带一个参数，所以当虚拟机要执行偏移量为 n 的指令时，那么 f_lasti 就是 n - 2。当然，如果字节码还没有开始执行，那么 f_lasti 为 -1。 f_localsplus 一个柔性数组，它的内存大小被分为 4 个部分。 注：f_localsplus 是一个数组，所以它是一段连续的内存，只不过按照用途被分成了 4 个部分。如果用新一团团长丁伟的说法：每个部分之间是鸡犬相闻，但又老死不相往来。 然后再着重强调一下运行时栈，虚拟机在执行字节码指令时高度依赖它，因为一个指令只能带一个参数，那么剩余的参数就必须通过运行时栈给出。比如 a = 1 会对应两条字节码：LOAD_CONST 和 STORE_NAME。 STORE_NAME 的作用是从符号表中获取符号，或者说变量名，然后和值绑定起来。而要加载符号，那么必须要知道它在符号表中的索引，显然这可以通过指令参数给出，但问题是与之绑定的值怎么获取？毫无疑问，要通过运行时栈。因此 LOAD_CONST 将值读取进来之后，还要压入运行时栈，然后 STORE_NAME 会将值从运行时栈中弹出，从而完成符号（变量）和值的绑定。 关于运行时栈，我们再看个复杂的例子： 偏移量为 6 的指令表示要构建一个字典，指令参数 2 表示构建的字典的长度为 2，但问题是字典的键值对在什么地方？显然它们已经被提前压入了运行时栈，执行 BUILD_CONST_KEY_MAP 的时候直接弹出即可。 所以这就是运行时栈的作用，如果某个指令需要 n 个参数，那么其中的 n - 1 个必须要提前压入运行时栈，然后在该指令执行的时候依次弹出，因为一个指令只能带一个参数。 f_stacktop 一个指针，指向运行时栈的栈顶。由于运行时栈存储的都是 PyObject *，所以 f_stacktop 的类型是 PyObject **。当然在源码中没有直接操作 f_stacktop 字段，而是定义了一个变量 stack_pointer，它初始等于 f_stacktop。后续操作的都是 stack_pointer，当然操作完之后，还要重新赋值给 f_stacktop。 所以 stack_pointer 始终指向运行时栈的栈顶，而元素的入栈和出栈，显然都是通过操作 stack_pointer 完成的。 执行 *stack_pointer++ = v，一个元素就入栈了。 执行 v = *--stack_pointer，一个元素就出栈了。 而随着元素的入栈和出栈，运行时栈的栈顶、或者说 stack_pointer 也在不断变化，但无论如何，stack_pointer 始终指向运行时栈的栈顶。当然啦，由于栈顶发生变化，后续还要对 f_stacktop 进行更新。 f_valuestack 一个指针，指向运行时栈的栈底。 另外我们说 f_localsplus 数组被分成了 4 份，最后一份给了运行时栈，因此虽然我们称之为栈，但它其实就是一个数组，而且还是数组的一部分。 而对于数组而言，内存地址从左往右是增大的。 这是 f_localsplus 的示意图，灰色区域表示运行时栈之前的部分，这里我们只看运行时栈，目前栈里面有两个元素，stack_pointer 指向栈顶。 这时如果要添加一个元素 3，那么直接 *stack_pointer++ = 3 即可。 如果要将栈顶元素弹出，那么执行 v = *--stack_pointer 即可。 还是比较清晰的，不过还没结束，我们还要继续探讨运行时栈。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 什么是运行时栈","id":"258","title":"什么是运行时栈"},"259":{"body":"相信你已经知道什么是运行时栈了，说白了它就是参数的容身之所，比如虚拟机在执行 a + b 的时候，通过指令和指令参数可以判断这是一个加法操作，但在执行加法的时候，加号两边的值要怎么获取呢？这时候就需要一个栈来专门保存相应的参数。在执行加法之前，先将 a 和 b 压入栈中，等执行加法的时候，再将 a 和 b 从栈里面弹出来即可，非常简单。 然后再来看看和运行时栈相关的一些宏，并加深对运行时栈的理解。 // Python/ceval.c #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))\n#define EMPTY() (STACK_LEVEL() == 0)\n#define TOP() (stack_pointer[-1])\n#define SECOND() (stack_pointer[-2])\n#define THIRD() (stack_pointer[-3])\n#define FOURTH() (stack_pointer[-4])\n#define PEEK(n) (stack_pointer[-(n)])\n#define SET_TOP(v) (stack_pointer[-1] = (v))\n#define SET_SECOND(v) (stack_pointer[-2] = (v))\n#define SET_THIRD(v) (stack_pointer[-3] = (v))\n#define SET_FOURTH(v) (stack_pointer[-4] = (v))\n#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))\n#define BASIC_STACKADJ(n) (stack_pointer += n)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v))\n#define BASIC_POP() (*--stack_pointer) #define PUSH(v) BASIC_PUSH(v)\n#define POP() BASIC_POP()\n#define STACK_GROW(n) BASIC_STACKADJ(n)\n#define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER)) 宏还是比较多的，我们来逐一介绍。假设目前运行时栈内部有三个元素，从栈底到栈顶分别是整数 1、2、3，那么运行时栈的结构就是下面这样。 f_localsplus 数组被分成 4 个区域，运行时栈占据最后一个，因此图中的灰色区域便是运行时栈之前的内存。由于我们是研究运行时栈，所以这部分区域后续就不再画了。 然后看一下这些和运行时栈相关的宏都是干嘛的。 STACK_LEVEL() 返回运行时栈的元素个数，显然直接让栈顶指针和栈底指针相减就完事了。 #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack)) 所以 STACK_LEVEL() 是会动态变化的，因为 stack_pointer 会动态变化。 记得之前在介绍 PyCodeObject 时，我们说它内部的 co_stacksize 字段表示执行代码块所需要的栈空间，而这个栈空间就是运行时栈的长度。当然也可以理解为要想执行这段代码块，后续创建栈桢时，应该给 f_localsplus 数组中表示运行时栈的区域分配能存储多少个元素的内存。 比如 co_stacksize 是 1，那么表示应该给运行时栈分配能存储 1 个元素的内存，即运行时栈的长度为 1。 STACK_LEVEL() 表示当前运行时栈已存储的元素数量，而 co_stacksize 表示运行时栈的长度，即最多能存储多少个元素。 我们通过反编译的方式，实际演示一下。 import dis def some_func(): a = 1 b = 2 c = 3 # 这里只保留字节码指令\ndis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 也就是说，运行时栈只要能容纳一个元素，即可执行这段代码\nprint(some_func.__code__.co_stacksize) # 1 我们再来看个例子。 import dis def some_func(): a = 1 b = 2 c = 3 lst = [a, b, c] dis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 1\nLOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 2 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 3\nBUILD_LIST # 将栈里的三个元素弹出，构建列表并入栈（此时元素个数为 1）\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 不难看出，要想执行这段代码，运行时栈要能容纳 3 个元素\nprint(some_func.__code__.co_stacksize) # 3 相信你现在应该理解 co_stacksize 的作用了，它表示运行时栈最多能容纳多少个元素，也就是运行时栈的长度。以上面代码为例，由于最多会压入 3 个元素，所以运行时栈的长度就是 3，即最多能容纳 3 个元素。并且这个长度在编译之后就已经确定了，因为可以通过遍历指令集静态计算出来。 我们画一张图描述一下上面的代码在执行时，运行时栈的变化过程。 整个过程应该很清晰，当然上面只是运行时栈的变化，f_localsplus 中存储局部变量的内存区域也在变化。另外如果代码块位于全局作用域，那么变化的就是全局名字空间，相关细节后续详细展开。 EMPTY() #define EMPTY() (STACK_LEVEL() == 0) 判断运行时栈是否为空，显然只需判断运行时栈的元素个数是否为 0 即可。 TOP() #define TOP() (stack_pointer[-1]) 查看当前运行时栈的栈顶元素。 SECOND() #define SECOND() (stack_pointer[-2]) 查看从栈顶元素开始的第二个元素。 THIRD() #define THIRD() (stack_pointer[-3]) 查看从栈顶元素开始的第三个元素。 FOURTH() #define FOURTH() (stack_pointer[-4]) 查看从栈顶元素开始的第四个元素。 PEEK(n) #define PEEK(n) (stack_pointer[-(n)]) 查看从栈顶元素开始的第 n 个元素。 SET_TOP(v) #define SET_TOP(v) (stack_pointer[-1] = (v)) 将当前运行时栈的栈顶元素设置成 v。 SET_SECOND(v) #define SET_SECOND(v) (stack_pointer[-2] = (v)) 将从栈顶元素开始的第二个元素设置成 v。 SET_THIRD(v) #define SET_THIRD(v) (stack_pointer[-3] = (v)) 将从栈顶元素开始的第三个元素设置成 v。 SET_FOURTH(v) #define SET_FOURTH(v) (stack_pointer[-4] = (v)) 将从栈顶元素开始的第四个元素设置成 v。 SET_VALUE(n, v) #define SET_VALUE(n, v) (stack_pointer[-(n)] = (v)) 将从栈顶元素开始的第 n 个元素设置成 v。 PUSH(v) #define PUSH(v) BASIC_PUSH(v)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v)) 往运行时栈中压入一个元素，并且压入之后，栈中已存储的元素个数一定不超过 co_stacksize。假设当前栈里有一个元素 1，然后添加一个元素 2。 Python 的变量都是一个指针，所以 stack_pointer 是一个二级指针，它永远指向栈顶位置，只不过栈顶位置会变。另外要注意：运行时栈的内存一开始就申请好了，初始状态下，里面的元素全部为 NULL。而往栈里面压入一个元素，其实就是修改 stack_pointer 指向的内存单元，然后执行 stack_pointer++。 POP() #define POP() BASIC_POP()\n#define BASIC_POP() (*--stack_pointer) 弹出栈顶元素，注意它和 TOP 的区别，TOP 是返回栈顶元素，但不弹出。 stack_pointer 指向栈顶位置，所以它向栈底移动一个位置，就相当于元素被弹出了。 关于弹出元素需要做一个说明，所谓弹出元素本质上就是将 stack_pointer 向栈底移动一个位置。我们看一下上图，一开始栈里面有两个元素，分别是整数 1 和整数 2，当然准确来说应该是指向它们的指针，但为了描述方便，我们就用对象本身代替了。 然后执行 POP()，将整数 2 弹出，但我们发现 POP() 之后，整数 2 还在栈里面。关于这一点很好理解，因为 stack_pointer 始终指向栈顶位置，而它向栈底移动了一个位置，那么整数 2 就已经不是栈顶元素了。当下一个元素入栈时，会把整数 2 替换掉。因此虽然整数 2 还在运行时栈里面，但和不在没有任何区别，此时我们依旧认为整数 2 被弹出了。 不过在后续的文章中，在画运行时栈的时候，我们也会这么画。 为了阅读清晰，stack_pointer 之后的元素就不写了。另外还要注意一点，运行时栈的内存一开始就已经申请好了，是固定的，弹出元素只是改变栈顶指针 stack_pointer 的指向，而内存区域的大小是不变的。 当然这些内容都比较简单，但为了避免出现歧义，这里单独解释一下。 STACK_GROW(n) #define STACK_GROW(n) BASIC_STACKADJ(n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 改变运行时栈的栈顶，注：运行时栈的大小是固定的，但栈顶是由 stack_pointer 决定的。 那么问题来了，假设要往运行时栈压入两个元素，分别是 2、3，该怎么做呢？首先肯定可以通过 PUSH 实现。 PUSH(2);\nPUSH(3); 但如果不让你用 PUSH，该怎么做呢？ STACK_GROW(2);\n// 设置元素\nSET_VALUE(1, 3); // stack_pointer[-1] = 3\nSET_VALUE(2, 2); // stack_pointer[-2] = 2 两种做法都是可以的。 STACK_SHRINK(n) #define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 它的作用和 STACK_GROWN 正好相反。 注意：STACK_SHRINK(3) 之后，stack_pointer 和 f_valuestack 都指向了运行时栈的栈底，同时也是栈顶。还是之前说的，栈空间是固定的，但栈顶会随着元素的入栈和出栈而动态变化。 另外，对于当前示例来说，如果你不关注栈里的元素的话，那么执行 STACK_SHRINK(3) 和执行三次 POP() 是等价的。当然不管是哪种情况，最终栈里的元素都还是 1、2、3，因为弹出元素只是改变栈顶指针 stack_pointer 的指向，而不会修改栈里的元素。当然啦，既然栈顶是由 stack_pointer 决定的，而它目前指向了栈底位置，所以我们可以认为此时栈是空的。 这么画似乎更清晰一些，但我们要知道这背后的整个过程。另外还要再次强调，运行时栈只是数组 f_localsplus 的一部分，并且是最后一部分，所以它的内存空间事先就申请好了，里面的每个元素都是 NULL。所谓添加元素，就是修改 stack_pointer 指针指向的内存，然后 stack_pointer++。所谓弹出元素，就是 stack_pointer--，然后返回 stack_pointer 指向的内存。 以上就是运行时栈的一些宏，后续阅读源码的时候，会经常遇到。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 运行时栈的一些宏","id":"259","title":"运行时栈的一些宏"},"26":{"body":"本篇文章来聊一聊对象的创建，一个对象是如何从无到有产生的呢？ >>> n = 123\n>>> n\n123 比如在终端中执行 n = 123，一个整数对象就创建好了，但它的背后都发生了什么呢？带着这些疑问，开始今天的内容。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"26","title":"楔子"},"260":{"body":"本篇文章我们就从宏观的角度介绍了虚拟机执行字节码的流程，说白了虚拟机就是把自己当成一个 CPU，在栈桢中执行指令。通过遍历字节码指令集，对不同的指令执行不同的处理逻辑。 然后是运行时栈，因为一个指令只能带一个参数，那么剩余的参数就需要通过运行时栈给出。比如 LOAD_CONST 指令，它在加载完常量之后，会将常量压入运行时栈，然后 STORE_NAME 或 STORE_FAST 指令再将常量从运行时栈的顶部弹出，并和某个符号（变量）绑定起来。 关于这些指令，我们后面会详细说。 最后我们介绍了运行时栈的一些宏，因为执行指令的时候会反复操作运行时栈，所以底层封装了很多的宏。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 小结","id":"260","title":"小结"},"261":{"body":"上一篇文章我们介绍了虚拟机是怎么执行字节码指令的，并且还介绍了运行时栈，以及操作运行时栈的一些宏。相信你对字节码执行的整个流程应该有了清晰的认识，那么接下来我们就深入到源码中，进一步考察执行过程。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 楔子","id":"261","title":"楔子"},"262":{"body":"之前说了，虚拟机就是把自己当成一个 CPU，在栈帧中执行字节码，面对不同的字节码指令，执行不同的处理逻辑。 具体实现由 Python/ceval.c 中的 _PyEval_EvalFrameDefault 函数负责，该函数超级长，并且里面还包含了大量的宏，这些宏完全可以定义在其它的文件中。像我们之前介绍的操作运行时栈的宏，也定义在 _PyEval_EvalFrameDefault 函数里面了。所以为了方便大家理解，我决定先介绍里面出现的宏，等宏说完了之后再看具体的逻辑。 #ifdef HAVE_COMPUTED_GOTOS #ifndef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 1 #endif\n#else #if defined(USE_COMPUTED_GOTOS) && USE_COMPUTED_GOTOS #error \"Computed gotos are not supported on this compiler.\" #endif #undef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 0\n#endif // 如果使用 \"计算跳转\"，导入静态跳转表\n#if USE_COMPUTED_GOTOS\n/* Import the static jump table */\n#include \"opcode_targets.h\" 里面出现了一个关键词：计算跳转，这是什么意思呢？ 首先 _PyEval_EvalFrameDefault（后续简称为帧评估函数）的代码量虽然很大，但它的核心不难理解，就是循环遍历字节码指令集，处理每一条指令。而当一条指令执行完毕时，虚拟机会有以下三种动作之一： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，比如执行 GET_ITER 指令，但对象不具备可迭代的性质。那么要进行异常处理（或者直接抛出异常），然后退出帧评估函数。 执行下一条指令。 前面两种动作没啥好说的，关键是第三种，如何执行下一条指令。首先虚拟机内部有一个巨型的 switch 语句，伪代码如下： int opcode;\nint oparg; for (;;) { // 循环遍历指令集，获取指令和指令参数 opcode = ...; // 指令 oparg = ...; // 指令参数 // 执行对应的处理逻辑 switch (opcode) { case LOAD_CONST: 处理逻辑; case LOAD_FAST: 处理逻辑; case LOAD_FAST: 处理逻辑; case BUILD_LIST: 处理逻辑; case DICT_UPDATE: 处理逻辑; // ... }\n} 一个 case 分支，对应一个字节码指令的实现，由于指令非常多，所以这个 switch 语句也非常庞大。然后遍历出的指令，会进入这个 switch 语句进行匹配，执行相应的处理逻辑。所以循环遍历 co_code 得到字节码指令，然后交给内部的 switch 语句、执行匹配到的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 其实到这里，你应该已经了解了帧评估函数的整体结构。说白了就是将自己当成一个 CPU，在栈帧中执行一条条指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。因此在虚拟机的执行流程进入了那个巨大的 for 循环，并取出第一条字节码指令交给里面的 switch 语句之后，第一张多米诺骨牌就已经被推倒，命运不可阻挡的降临了。一条接一条的指令如同潮水般涌来，浩浩荡荡，横无际涯。 虽然在概念上很好理解，但很多细节被忽略掉了，本篇文章就将它们深挖出来。还是之前的问题，当一个指令执行完毕时，怎么执行下一条指令。 估计有人对这个问题感到奇怪，在 case 分支的内部加一行 continue 进行下一轮循环不就行了吗？没错，这种做法是行得通的，但存在性能问题。因为 continue 会跳转到 for 循环所在位置，所以遍历出下一条指令之后，会再次进入 switch 语句进行匹配。尽管逻辑上是正确的，但 switch 里面有数百个 case 分支，如果每来一个指令，都要顺序匹配一遍的话，那么效率必然不高。 而事实上整个字节码指令集是已知的，所以不管执行哪个指令，我们都可以提前得知它的下一个指令，只需将指针向后偏移两个字节即可。 那么问题来了，既然知道下一条要执行的指令是什么，那么在当前指令执行完毕时，可不可以直接跳转到下一条指令对应的 case 分支中呢？ 答案是可以的，这个过程就叫做计算跳转，通过标签作为值即可实现。关于什么是标签作为值，我们用一段 C 代码解释一下。 #include <stdio.h> void label_as_value(int jump) { int num = 4; void *label; switch (num) { case 1: printf(\"%d\\n\", 1); break; // 在 case 2 分支里面定义了一个标签叫 two case 2: two: { printf(\"%d\\n\", 2); break; } // 在 case 3 分支里面定义了一个标签叫 three case 3: three: { printf(\"%d\\n\", 3); break; } case 4: printf(\"%d\\n\", 4); // 如果参数 jump 等于 2，保存 two 标签的地址 // 如果参数 jump 等于 3，保存 three 标签的地址 if (jump == 2) label = &&two; else if (jump == 3) label = &&three; // 跳转到指定标签 goto *label; default: break; }\n} int main() { label_as_value(2); // 4 // 2 label_as_value(3); // 4 // 3\n} 由于变量 num 等于 4，所以会进入 case 4 分支，在里面有一个 goto *label。如果你对 C 不是特别熟悉的话，估计会有些奇怪，觉得不应该是 goto label 吗？如果是 goto label，那么需要显式地定义一个名为 label 的标签，但这里并没有。我们的目的是跳转到 two 标签或 three 标签，具体跳转到哪一个，则由参数控制。因此可以使用 && 运算符，这是 GCC 的一个扩展特性，叫做标签作为值，它允许我们获取标签的地址作为一个值。 所以在开头声明了一个 void *label，然后让 label 保存标签地址，再通过 goto *label 跳转到指定标签。由于 *label 代表哪个标签是在运行时经过计算才能知晓，因此称为计算跳转（在运行时动态决定跳转目标）。 注意：goto *&&标签名 属于高级的、非标准的 C 语言用法。 那么毫无疑问，解释器也一定为处理指令的 case 分支定义了相应的标签，并拿到了这些标签的地址。没错，这些标签地址位于 Python/opcode_targets.h 中，这个 opcode_targets.h 就是上面的帧评估函数导入的头文件。 每个指令的处理逻辑都会对应一个标签，这些标签的地址全部保存在了数组中，执行帧评估函数时导入进来即可。这里可能有人会问，导入数组时，它里面的标签都还没有定义吧。确实如此，不过没关系，对于 C 来说，标签只要定义了，那么它在函数的任何一个位置都可以使用。 假设要执行的下一条指令为 opcode，那么就会跳转到 *opcode_targets[opcode]，因此我们有理由相信，指令和 opcode_targets 数组的索引之间存在某种关联。而这种关联也很好想，opcode_targets[opcode] 指向的标签，其内部的逻辑就是用来处理 opcode 指令的，我们来验证一下。 #define LOAD_CONST 100\n#define LOAD_NAME 101 比如 LOAD_CONST 的值为 100，那么 opcode_targets[100] 肯定会指向 TARGET_LOAD_CONST 标签；LOAD_NAME 的值为 101，那么 opcode_targets[101] 肯定会指向 TARGET_LOAD_NAME 标签。 结果没有问题，其它指令也是一样的，通过计算跳转，可以直接 goto 到指定的标签。 好，我们总结一下，首先帧评估函数内部有一个巨型的 switch，每一个指令的处理逻辑都对应一个 case 分支，由于指令有一百多个，所以 case 分支也有一百多个。而当指令进入 switch 后，显然会顺序匹配这一百多个 case 分支，找到符合条件的那一个。 整个过程的逻辑是没问题的，但效率上还可以更进一步优化，因为整个字节码指令集是已知的，既然都提前知道了下一条待处理的指令是什么，那完全可以直接跳转到对应的 case 分支中。所以每个 case 分支都会对应一个标签，我们看一下源码。 这个 TARGET 是一个宏，也定义在帧评估函数中。 #define TARGET(op) \\ op: \\ TARGET_##op // 所以 case TARGET(LOAD_CONST): 展开之后就会变成\n// case LOAD_CONST: TARGET_LOAD_CONST: 所以在指令的名称前加一个 TARGET_ 就是对应的标签，比如下一条要执行的指令是 YIELD_VALUE，它等于 86，那么 opcode_targets[86] 就等于 &&TARGET_YIELD_VALUE，指向的标签内部便是 YIELD_VALUE 的处理逻辑，至于其它指令也是同理。 因此读取完下一条指令之后，就不用跳转到开头重新走一遍 switch 了。而是将指令作为索引，从 opcode_targets 拿到标签地址直接跳转即可，并且跳转后的标签内部的逻辑就是用来处理该指令的。 所以底层为每个指令的处理逻辑都定义了一个标签，而标签的地址在数组中的索引，和要处理的指令本身是相等的。 不过要想实现计算跳转，需要 GCC 支持标签作为值这一特性，即 goto *标签地址，至于标签地址是哪一个标签的地址，则在运行时动态计算得出。比如 opcode_targets[opcode] 指向哪个标签无从得知，这取决于 opcode 的值。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 以上就是计算跳转，我们继续往下说。 // 如果使用了计算跳转\n#define FAST_DISPATCH() \\ { \\ if (!_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \\ f->f_lasti = INSTR_OFFSET(); /* 将当前指令的偏移量赋值给 f_lasti */ \\ NEXTOPARG(); /* 获取下一条指令 */ \\ goto *opcode_targets[opcode]; /* 跳转到对应的标签中 */ \\ } \\ goto fast_next_opcode; \\ } #define DISPATCH() \\ { \\ if (!_Py_atomic_load_relaxed(eval_breaker)) { \\ FAST_DISPATCH(); \\ } \\ continue; \\ } #define TARGET(op) \\ op: \\ TARGET_##op // 如果不使用计算跳转\n#define TARGET(op) op\n#define FAST_DISPATCH() goto fast_next_opcode\n#define DISPATCH() continue 每条指令在执行的最后，都会调用 DISPATCH() 或 FAST_DISPATCH()，我们看一下源码。 如果不使用计算跳转，那么 DISPATCH() 就等价于 continue，直接进行下一轮 for 循环，然后进入 switch。而 FAST_DISPATCH() 会跳转到 fast_next_opcode 标签，该标签定义在 for 循环的里面，switch 的外面，所以它虽然不用从 for 循环的位置开始执行，但依然要走一遍完整的 switch。另外由于不使用计算跳转，那么 case 分支里的标签也就没意义了，所以 case TARGET(op) 就等价于 case op。 如果使用计算跳转，那么就是之前说的那样，在指令执行完之后（并且没有中断请求）会调用 NEXTOPARG() 获取下一条指令，然后通过 goto *opcode_targets[opcode] 实现计算跳转，直接跳到下一条指令对应的 case 分支中，从而省去了匹配的时间。 好，我们继续往下看。 // 获取元组 v 中索引为 i 的元素\n#define GETITEM(v, i) PyTuple_GetItem((v), (i)) /* 在遍历字节码指令序列时，会用到以下两个变量 * first_instr：永远指向字节码指令序列的第一条指令 * next_instr：永远指向下一条待执行（或正在执行）的字节码指令 * 另外由于每条字节码指令都会带有一个参数 * 所以 first_instr 和 next_instr 的类型都是 _Py_CODEUNIT *，即 uint16_t * * 其中前 8 位表示指令，后 8 位表示指令参数 */ // 在调用 NEXTOPARG() 之前，next_instr 指向正在执行的字节码指令\n// 如果调用了 NEXTOPARG()，那么 next_instr 就会指向下一条待执行的字节码指令\n// 该宏计算的显然就是它和第一条指令（或者说字节码指令序列的起始位置）之间的偏移量\n#define INSTR_OFFSET() \\ (sizeof(_Py_CODEUNIT) * (int)(next_instr - first_instr)) // 获取 next_instr 指向的 uint16 的前 8 位和后 8 位，也就是拿到指令和指令参数\n// 然后执行 next_instr++\n#define NEXTOPARG() do { \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ } while (0) 通过 INSTR_OFFSET 和 NEXTOPARG，我们介绍了两个指针变量：first_instr 和 next_instr，虚拟机就是通过它们来完成遍历的。 #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个指令等到介绍 if 控制流的时候再说，不过相信你也能猜到它是做什么的，if 控制流的某个分支如果不满足条件，就会跳到下一个分支。而这个跳转过程是怎么实现的呢？显然要借助于这里的 JUMPTO 和 JUMPBY。 // 指令预测\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif\n#define PREDICTED(op) PRED_##op: PREDICT 宏和指令预测相关，后续介绍 if 控制流的时候再说。 关于宏就说到这里，至于剩下的一些宏，暂时就先不用看了，我们在后续的部分才会用到它们。 好，既然宏说完了，接下来我们可以看整个帧评估函数都做些什么了，代码有删减。 PyObject* _Py_HOT_FUNCTION\n_PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)\n{ // 初始化一些变量，它们的含义等赋值的时候再说 PyObject **stack_pointer; const _Py_CODEUNIT *next_instr; int opcode; int oparg; PyObject **fastlocals, **freevars; PyObject *retval = NULL; _PyRuntimeState * const runtime = &_PyRuntime; PyThreadState * const tstate = _PyRuntimeState_GetThreadState(runtime); struct _ceval_runtime_state * const ceval = &runtime->ceval; _Py_atomic_int * const eval_breaker = &ceval->eval_breaker; PyCodeObject *co; int instr_ub = -1, instr_lb = 0, instr_prev = -1; const _Py_CODEUNIT *first_instr; PyObject *names; PyObject *consts; _PyOpcache *co_opcache; // ... // 省略了一堆的宏定义，就是我们上面刚介绍的 // ... // 检查是否超过递归深度限制 if (Py_EnterRecursiveCall(\"\")) return NULL; // tstate->frame 保存当前正在执行的栈桢，所以将 f 赋值给 tstate->frame // 至于之前的 tstate->frame，则保存在 f.f_back 字段中（在创建栈桢 f 的时候就完成了） tstate->frame = f; // 如果启用追踪机制 if (tstate->use_tracing) { // tstate->c_tracefunc 对应 Python 里的 sys.settrace // 如果不为空，那么进行调用 // 该函数可以监控每行代码的执行，因此一般用于调试器 if (tstate->c_tracefunc != NULL) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } // tstate->c_profilefunc 对应 Python 里的 sys.setprofile // 如果不为空，那么进行调用，该函数主要用于性能分析 if (tstate->c_profilefunc != NULL) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } } // DTrace 是一个强大的动态追踪工具 // 这里检测是否启用了 DTrace 的函数入口探针 if (PyDTrace_FUNCTION_ENTRY_ENABLED()) // 如果启用了 DTrace，则记录函数进入的事件 dtrace_function_entry(f); // 获取栈桢内部的关键字段 co = f->f_code; names = co->co_names; consts = co->co_consts; fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; assert(PyBytes_Check(co->co_code)); assert(PyBytes_GET_SIZE(co->co_code) <= INT_MAX); assert(PyBytes_GET_SIZE(co->co_code) % sizeof(_Py_CODEUNIT) == 0); assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(co->co_code), sizeof(_Py_CODEUNIT))); // 注意这里的 first_instr，上面已经介绍了，它指向字节码指令序列的起始位置，或者说第一条指令 first_instr = (_Py_CODEUNIT *) PyBytes_AS_STRING(co->co_code); assert(f->f_lasti >= -1); // 初始状态下，next_instr 和 first_instr 相等 next_instr = first_instr; if (f->f_lasti >= 0) { assert(f->f_lasti % sizeof(_Py_CODEUNIT) == 0); next_instr += f->f_lasti / sizeof(_Py_CODEUNIT) + 1; } stack_pointer = f->f_stacktop; assert(stack_pointer != NULL); f->f_stacktop = NULL; f->f_executing = 1; // 进入主循环，在这个 for 循环里面一会儿就会看到那个巨型的 switch main_loop: // 遍历字节码指令集，处理每一条指令 for (;;) { // stack_pointer 是栈顶指针，f_valuestack 是栈底指针 // 由于 Python 的运行时栈是基于数组实现的，所以从栈底到栈顶，地址是增大的 // 因此 stack_pointer 一定大于等于 f_valuestack assert(stack_pointer >= f->f_valuestack); // STACK_LEVEL() 一定小于等于运行时栈的长度，之前说过的 assert(STACK_LEVEL() <= co->co_stacksize); // 线程状态对象里面没有异常产生 assert(!_PyErr_Occurred(tstate)); // 检测是否有待处理的中断（比如信号、GIL 释放请求等） if (_Py_atomic_load_relaxed(eval_breaker)) { opcode = _Py_OPCODE(*next_instr); /* 如果指令是以下之一，那么忽略中断，直接跳到 fast_next_opcode 标签进行处理 * SETUP_FINALLY：try / finally 语句的开始 * SETUP_WITH：with 语句的开始 * BEFORE_ASYNC_WITH：async with 语句的开始 * YIELD_FROM：yield from 表达式 */ // 这种设计主要是为了确保在某些关键操作（如资源管理、异常处理、异步操作）的开始阶段不被中断信号打断 // 从而保证这些操作的正确性和可靠性，进而保证 Python 程序的稳定性和可预测性 if (opcode == SETUP_FINALLY || opcode == SETUP_WITH || opcode == BEFORE_ASYNC_WITH || opcode == YIELD_FROM) { goto fast_next_opcode; } // 使用原子操作检查是否有待处理的信号 // 如果有待处理的信号，那么调用 handle_signals 函数处理它们 // 这个机制允许 Python 程序响应外部事件和系统信号，同时保证执行的正确性 if (_Py_atomic_load_relaxed(&ceval->signals_pending)) { if (handle_signals(runtime) != 0) { goto error; } } // 通过原子操作检查是否有待处理的调用需要执行，calls_to_do 是一个计数器，表示待处理的调用的数量 // 如果有待处理的调用，那么执行 make_pending_calls 函数 // pending calls 主要用于垃圾回收（GC）、异步 IO 回调、定时器事件等 // 这个机制是 Python 运行时系统的重要组成部分，允许虚拟机在主循环中处理各种异步任务和周期性任务 // 确保各种后台任务能够得到及时处理，并且不需要使用额外的线程和复杂的调度机制 if (_Py_atomic_load_relaxed(&ceval->pending.calls_to_do)) { if (make_pending_calls(runtime) != 0) { goto error; } } // 通过原子操作检查是否有释放 GIL 的请求，如果有，那么该线程就要释放 GIL if (_Py_atomic_load_relaxed(&ceval->gil_drop_request)) { // 将当前线程状态设置为 NULL，因为要发生切换了（关于 GIL，后续会单独介绍） if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) { Py_FatalError(\"ceval: tstate mix-up\"); } // 释放 GIL，给其它线程一个机会，不能让某一个线程一直霸占着 // 如果开启了多线程，那么当释放 GIL 的那一刻，就会被其它线程获取 drop_gil(ceval, tstate); // GIL 释放之后，还要再次获取，但 GIL 已经被其它线程拿走了 // 所以会触发操作系统内核的线程调度机制，进入阻塞状态，等待 GIL 再度回到自己手中 // 因此不难发现，如果有 n 个线程，那么其中的 n - 1 个会陷入阻塞，等待获取 GIL // 而一旦持有 GIL 的线程执行了 drop_gil 函数，将 GIL 释放了 // 那么这 n - 1 个线程当中就会有一个线程拿到 GIL 并解除阻塞，然后开始执行字节码 // 至于释放 GIL 的线程，则会尝试再次获取 GIL，但会因为获取不到而陷入阻塞（已经被其它线程拿走了） take_gil(ceval, tstate); // 检查是否需要快速退出线程（比如在解释器关闭时） exit_thread_if_finalizing(runtime, tstate); // 到这里说明 take_gil 返回了（即阻塞状态解除），也意味着拿到了 GIL，那么要恢复线程状态 if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) { Py_FatalError(\"ceval: orphan tstate\"); } } // 检测线程状态中是否存在异步的异常 if (tstate->async_exc != NULL) { PyObject *exc = tstate->async_exc; tstate->async_exc = NULL; UNSIGNAL_ASYNC_EXC(ceval); _PyErr_SetNone(tstate, exc); Py_DECREF(exc); goto error; } } // 以上是一些中断检测逻辑，如果执行顺利，那么会走到这里 fast_next_opcode: // 保存上一条已执行完毕的字节码的偏移量 f->f_lasti = INSTR_OFFSET(); // 如果启用了 DTrace 行追踪，那么记录行级别的执行信息 if (PyDTrace_LINE_ENABLED()) maybe_dtrace_line(f, &instr_lb, &instr_ub, &instr_prev); // 检查是否需要执行行级追踪，如果追踪功能可用并且设置了追踪函数，那么执行 // 这是 Python 调试和性能分析功能的核心部分，使得像 pdb 这样的调试器能够逐行执行代码 if (_Py_TracingPossible(ceval) && tstate->c_tracefunc != NULL && !tstate->tracing) { int err; // 保存当前栈指针 f->f_stacktop = stack_pointer; // 调用行追踪函数 err = maybe_call_line_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, &instr_lb, &instr_ub, &instr_prev); // 追踪函数可能改变帧的状态，需要重新加载，并更新栈指针 JUMPTO(f->f_lasti); if (f->f_stacktop != NULL) { stack_pointer = f->f_stacktop; f->f_stacktop = NULL; } if (err) goto error; } // 这个宏前面介绍了，它会获取下一条待处理的指令和指令参数 NEXTOPARG(); // 进入 dispatch_opcode 标签 dispatch_opcode: // 下面这些宏主要用于指令追踪和性能分析，简单了解一下就好\n#ifdef DYNAMIC_EXECUTION_PROFILE // 如果启用了动态执行性能分析\n#ifdef DXPAIRS // 如果启用了指令对分析 dxpairs[lastopcode][opcode]++; // 记录相邻指令对的出现次数 lastopcode = opcode; // 更新上一个指令\n#endif dxp[opcode]++; // 记录单个指令的执行次数\n#endif #ifdef LLTRACE // 如果启用了低级追踪，并且追踪开关打开，那么打印偏移量、指令、指令参数等信息 if (lltrace) { if (HAS_ARG(opcode)) { printf(\"%d: %d, %d\\n\", f->f_lasti, opcode, oparg); } else { printf(\"%d: %d\\n\", f->f_lasti, opcode); } }\n#endif // 好的，关键来了，我们终于来到了这个巨型的 switch // 一个指令对应一个 case 分支，里面包含了该指令的处理逻辑 // 因为有一百多个 case 分支，所以这个 switch 语句的代码量高达 2300 多行 // 当然啦，也仅仅只是代码量大，但逻辑很单纯，就是定义了一百多条指令的处理逻辑嘛 switch (opcode) { // NOP 指令的处理逻辑，另外还记得这个 TARGET 宏吗？如果开启了计算跳转，那么分支内部还会定义一个标签 // 此时 case TARGET(NOP) 会展开成 case NOP: TARGET_NOP: case TARGET(NOP): { FAST_DISPATCH(); } // LOAD_FAST 指令的处理逻辑 case TARGET(LOAD_FAST): { PyObject *value = GETLOCAL(oparg); if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // LOAD_CONST 指令的处理逻辑 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); PyObject *value = GETITEM(consts, oparg); Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // STORE_FAST 指令的处理逻辑 case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); PyObject *value = POP(); SETLOCAL(oparg, value); FAST_DISPATCH(); } // POP_TOP 指令的处理逻辑 case TARGET(POP_TOP): { PyObject *value = POP(); Py_DECREF(value); FAST_DISPATCH(); } // ... // ... // ... // MAKE_FUNCTION 指令的处理逻辑 case TARGET(MAKE_FUNCTION): { // ... PUSH((PyObject *)func); DISPATCH(); } // BUILD_SLICE 指令的处理逻辑 case TARGET(BUILD_SLICE): { // ... if (slice == NULL) goto error; DISPATCH(); } // FORMAT_VALUE 指令的处理逻辑 case TARGET(FORMAT_VALUE): { // ... DISPATCH(); } // EXTENDED_ARG 指令的处理逻辑 case TARGET(EXTENDED_ARG): { int oldoparg = oparg; NEXTOPARG(); oparg |= oldoparg << 8; goto dispatch_opcode; } /* 这些指令内部的具体逻辑，我们后续会聊 */ // 如果执行到这里，说明上面的 case 分支都没有匹配到，意味着出现了一个未知的指令 // 那么打印错误信息：unknown opcde，不过基本不会发生，除非你刻意构造一个不存在的指令\n#if USE_COMPUTED_GOTOS _unknown_opcode:\n#endif default: fprintf(stderr, \"XXX lineno: %d, opcode: %d\\n\", PyFrame_GetLineNumber(f), opcode); _PyErr_SetString(tstate, PyExc_SystemError, \"unknown opcode\"); goto error; } // 到这里，switch 语句块就结束了 // 这个位置永远不可能到达，因为在每条指令的处理逻辑的最后，要么调用 DISPATCH()，要么 goto error // 调用 DISPATCH() 会去执行下一条指令，goto error 会跳转到下面的 error 标签 // 当然这里的 Py_UNREACHABLE() 有没有都无所谓，但加上之后会让程序显得更加严谨 Py_UNREACHABLE(); // 如果字节码指令在执行时出错了，那么会设置异常，然后跳转到 error 标签\nerror:\n// 以下是错误处理的防御性代码，用于确保在发生错误时总是设置了适当的异常 // 记得之前介绍过异常的本质，其实就是解释器内部在执行时发现逻辑出问题了（比如索引超出范围）\n// 那么会将异常（比如 IndexError）设置在回溯栈中，并立即返回一个表示错误的哨兵值\n// 当解释器将返回值传递给 Python 时，会发现返回值为 NULL，知道出异常了\n// 于是会将回溯栈里的异常输出到 stderr 当中，就是我们在终端中看到的那一坨红色的东西，然后结束进程\n// 但如果解释器发现回溯栈里面没有异常，那么会额外设置一个 SystemError: error return without exception set\n// 意思就是：\"明明发生错误了，为什么回溯栈里面没有设置异常呢？\"，一般这个问题会在用 C 编写扩展模块的时候遇到 #ifdef NDEBUG if (!_PyErr_Occurred(tstate)) { _PyErr_SetString(tstate, PyExc_SystemError, \"error return without exception set\"); }\n#else // 当然如果没有定义 NDEBUG 宏的话，那么就会展开成一个 assert 断言 // 对于解释器本身来说，像这种 assert 断言都是成立的，否则底层源码写的就有问题 assert(_PyErr_Occurred(tstate));\n#endif // 报错时，要生成 traceback，即回溯栈，关于 traceback，等介绍异常捕获的时候再说 PyTraceBack_Here(f); // 执行追踪函数，用于调试器捕获异常、追踪异常、以及异常处理的监控和分析等 // 在使用 pdb 调试器时，这个机制允许调试器捕获和显示异常信息 if (tstate->c_tracefunc != NULL) call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); // 这里和异常捕获相关，我们后续再聊 exception_unwind: while (f->f_iblock > 0) { // ... } break; } // 到这里，外层的 for 循环就结束了，显然会有两种情况 // 要么字节码都执行完毕了，要么出异常了，但不管是哪种，都意味着要退出栈桢了 assert(retval == NULL); assert(_PyErr_Occurred(tstate)); // 到这里说明要退出栈桢了，如果运行时栈里面还有元素的话，那么要清空\nexit_returning: while (!EMPTY()) { PyObject *o = POP(); Py_XDECREF(o); } // 生成器在 yield 时的追踪处理逻辑\n// 另外像这些追踪函数可以不用太关注，都是用于调试和性能分析的\nexit_yielding: if (tstate->use_tracing) { if (tstate->c_tracefunc) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } if (tstate->c_profilefunc) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } } // 帧评估函数退出时的清理代码\nexit_eval_frame: // 如果启用了 DTrace，记录函数返回事件 if (PyDTrace_FUNCTION_RETURN_ENABLED()) dtrace_function_return(f); // 退出递归调用，与之前的 Py_EnterRecursiveCall() 相对应 Py_LeaveRecursiveCall(); // 标记帧不再处于执行状态 f->f_executing = 0; // 当调用一个函数时，会在当前帧的基础上创建新的帧，并将执行权交给新的帧 // 当函数执行完毕时，会销毁栈桢，并将执行权还给上一级栈帧（即调用者的帧），这个过程叫做栈桢回退 // 显然这里要将 f->back 赋值给 tstate->frame，即回退到上一级栈桢 tstate->frame = f->f_back; // 检查返回值的有效性，确保返回值符合 Python 的调用约定 return _Py_CheckFunctionResult(NULL, retval, \"PyEval_EvalFrameEx\"); } 以上就是帧评估函数的源码逻辑，总的来说并不难理解，其核心就是通过 for 循环遍历字节码指令集，将遍历出的指令交给内部的 switch 语句，执行对应的 case 分支。当匹配到的 case 分支执行完毕时，会有以下三种情况： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，跳转到 error 标签，然后进行异常处理（或者直接抛出异常）。 执行下一条指令，如果开启了计算跳转，那么会精确跳转到下一条指令的处理逻辑中，否则会跳转到 fast_next_opcode 标签的所在位置、或者 for 循环的所在位置。但不管如何，虚拟机接下来的动作就是获取下一条字节码指令和指令参数，完成对下一条指令的执行。 所以通过 for 循环一条一条遍历 co_code 中的字节码指令，然后交给内部的 switch 语句、执行对应的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 相信到此刻你已经彻底了解了 Python 执行引擎的整体结构。说白了虚拟机就是将自己当成一个 CPU，在栈帧中一条条的执行指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 源码解析字节码指令的执行过程","id":"262","title":"源码解析字节码指令的执行过程"},"263":{"body":"光看源码还是有点枯燥的，下面我们来写一段简单的代码，然后反编译，并通过画图来演示虚拟机是如何执行字节码的。 code = \"\"\"\\\nchinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3\n\"\"\" # 将上面的代码以模块的方式进行编译\nco = compile(code, \"my_module\", \"exec\")\n# 查看常量池\nprint(co.co_consts) # (89, 99, 91, 3, None)\n# 查看符号表\nprint(co.co_names) # ('chinese', 'math', 'english', 'avg') 在编译的时候，常量和符号（变量）都会被静态收集起来。然后我们反编译一下看看字节码，直接通过 dis.dis(co) 即可，结果如下： 1 0 LOAD_CONST 0 (89) 2 STORE_NAME 0 (chinese) 2 4 LOAD_CONST 1 (99) 6 STORE_NAME 1 (math) 3 8 LOAD_CONST 2 (91) 10 STORE_NAME 2 (english) 4 12 LOAD_NAME 0 (chinese) 14 LOAD_NAME 1 (math) 16 BINARY_ADD 18 LOAD_NAME 2 (english) 20 BINARY_ADD 22 LOAD_CONST 3 (3) 24 BINARY_TRUE_DIVIDE 26 STORE_NAME 3 (avg) 28 LOAD_CONST 4 (None) 30 RETURN_VALUE 上面每一列的含义之前说过，这里再重复一下。 第一列是源代码的行号； 第二列是指令的偏移量，或者说该指令在整个字节码指令序列中的索引。因为每条指令后面都跟着一个参数，所以偏移量是 0 2 4 6 8 ...； 第三列是字节码指令，简称指令，它们在宏定义中代表整数； 第四列是字节码指令参数，简称指令参数、或者参数，不同的指令参数的含义不同； 第五列是 dis 模块给我们额外提供的信息，一会儿说； 我们从上到下依次解释每条指令都干了什么？ 0 LOAD_CONST：表示加载一个常量（指针），并压入运行时栈。后面的指令参数 0 表示从常量池中加载索引为 0 的常量，至于 89 则表示加载的常量是 89。所以最后面的括号里面的内容实际上起到的是一个提示作用，告诉你加载的对象是什么。 2 STORE_NAME：表示将 LOAD_CONST 加载的常量用一个名字绑定起来，放在所在的名字空间中。后面的 0 (chinese) 则表示使用符号表中索引为 0 的名字（符号），且名字为 \"chinese\"。 所以像 chinese = 89 这种简单的赋值语句，会对应两条字节码指令。 然后 4 LOAD_CONST、6 STORE_NAME 和 8 LOAD_CONST、10 STORE_NAME 的作用显然和上面是一样的，都是加载一个常量，然后将某个符号和常量绑定起来，并放在名字空间中。 12 LOAD_NAME：加载一个变量，并压入运行时栈，而后面的 0 (chinese) 表示加载符号表中索引为 0 的变量的值，然后这个变量叫 chinese。14 LOAD_NAME 也是同理，将符号表中索引为 1 的变量的值压入运行时栈，并且变量叫 math。此时栈里面有两个元素，从栈底到栈顶分别是 chinese 和 math。 16 BINARY_ADD：将上面两个变量从运行时栈弹出，然后执行加法操作，并将结果压入运行时栈。 18 LOAD_NAME：将符号表中索引为 2 的变量 english 的值压入运行时栈，此时栈里面有两个元素，从栈底到栈顶分别是 chinese + math 的返回结果和 english。 20 BINARY_ADD：将运行时栈里的两个元素弹出，然后执行加法操作，并将结果压入运行时栈。此时栈里面有一个元素，就是 chinese + math + english 的返回结果。 22 LOAD_CONST：将常量 3 压入运行时栈，此时栈里面有两个元素； 24 BINARY_TRUE_DIVIDE：将运行时栈里的两个元素弹出，然后执行除法操作，并将结果压入运行时栈，此时栈里面有一个元素； 26 STORE_NAME：将元素从运行时栈里面弹出，并用符号表中索引为 3 的变量 avg 和它绑定起来，然后放在名字空间中。 28 LOAD_CONST：将常量 None 压入运行时栈，然后通过 30 RETURN_VALUE 将其从栈中弹出、并返回。 所以 Python 虚拟机就是把自己想象成一个 CPU，在栈帧中一条条执行字节码指令，当指令执行完毕或执行出错时，停止执行。 我们通过几张图展示一下上面的过程，为了阅读方便，这里将相应的源代码再贴一份。 chinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3 之前说了，模块也有自己的作用域，并且是全局作用域，所以虚拟机也会为它创建栈帧。而在代码还没有执行的时候，栈帧就已经创建好了，整个布局如下。 f_localsplus 下面的箭头方向，代表运行时栈从栈底到栈顶的方向。 这里再强调一下 f_localsplus 字段，它是一个柔性数组。虽然声明的时候写着长度为 1，但实际使用时，长度不受限制，和 Go 语言不同，C 数组的长度不属于类型的一部分。然后 f_localsplus 在逻辑上被分成了四份，分别用于局部变量、cell 变量、free 变量、运行时栈，由于当前示例中的代码是以模块的方式编译的，里面所有的变量都是全局变量，而且也不涉及闭包啥的，所以这里就把 f_localsplus 理解为运行时栈即可。 接下来就开始执行字节码了，next_instr 指向下一条待执行的字节码指令，显然初始状态下，下一条待执行的指令就是第一条指令。 于是虚拟机开始执行 0 LOAD_CONST，该指令表示将常量加载进运行时栈，而要加载的常量在常量池中的索引，由指令参数表示。 在源码中，指令对应的变量是 opcode，指令参数对应的变量是 oparg。 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); // 调用元组的 GETITEM 方法，从常量池中加载索引为 oparg 的对象 // 当然啦，为了描述方便我们称之为对象，但其实是指向对象的指针 PyObject *value = GETITEM(consts, oparg); // 增加引用计数 Py_INCREF(value); // 压入运行时栈 PUSH(value); FAST_DISPATCH();\n} 该指令的参数为 0，所以会将常量池中索引为 0 的元素 89 压入运行时栈，执行完之后，栈帧的布局就变成了下面这样： 接着虚拟机执行 2 STORE_NAME 指令，从符号表中获取索引为 0 的符号、即 chinese。然后将栈顶元素 89 弹出，再将符号 chinese 和整数对象 89 绑定起来保存到 local 名字空间中。 case TARGET(STORE_NAME): { // 从符号表中加载索引为 oparg 的符号 // 符号本质上就是一个 PyUnicodeObject 对象 // 这里就是字符串 \"chinese\" PyObject *name = GETITEM(names, oparg); // 从运行时栈的栈顶弹出元素 // 显然是上一步压入的 89 PyObject *v = POP(); // 获取名字空间 namespace PyObject *ns = f->f_locals; int err; // 如果没有名字空间则报错，设置异常 if (ns == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals found when storing %R\", name); Py_DECREF(v); goto error; } // 将符号和对象绑定起来放在 ns 中 // 名字空间是一个字典，PyDict_CheckExact 负责检测 ns 是否为字典，等价于 type(ns) is dict // 除此之外，还有 PyDict_Check(ns)，它等价于 isinstance(ns, dict) if (PyDict_CheckExact(ns)) // 通过字典的特定类型 API 将键值对 \"chinese\": 89 设置到字典中 err = PyDict_SetItem(ns, name, v); else // 走到这里说明 type(ns) 不是 dict，那么它应该继承 dict // 通过泛型 API 设置元素 err = PyObject_SetItem(ns, name, v); // 对象的引用计数减 1，因为从运行时栈中弹出了 Py_DECREF(v); // 如果 err != 0，证明设置元素出错了，跳转至 error 标签 if (err != 0) goto error; // 调用 DISPATCH() 执行下一条指令，如果没有开启计算跳转，那么它就相当于一个 continue DISPATCH();\n} 执行完之后，栈帧的布局就变成了下面这样： 此时运行时栈为空，local 名字空间多了个键值对。 同理剩余的两个赋值语句也是类似的，只不过指令参数不同，比如 6 STORE_NAME 加载的是符号表中索引为 1 的符号，10 STORE_NAME 加载的是符号表中索引为 2 的符号，分别是 math 和 english。它们执行完之后，栈桢布局如下： 然后 12 LOAD_NAME 和 14 LOAD_NAME 负责将符号表中索引为 0 和 1 的变量的值压入运行时栈： case TARGET(LOAD_NAME): { // 从符号表 co_names 中加载索引为 oparg 的变量（符号） // 但是注意：全局变量是通过字典存储的 // 所以这里的 name 只是一个字符串罢了，比如 \"chinese\" // 然后还要再根据这个字符串从字典里面查找对应的 value PyObject *name = GETITEM(names, oparg); // 对于模块来说，f->f_locals 和 f->f_globals 指向同一个字典 PyObject *locals = f->f_locals; PyObject *v; // local 名字空间一定不为 NULL if (locals == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals when loading %R\", name); goto error; } // 如果 type(locals) is dict 为真 if (PyDict_CheckExact(locals)) { // 根据 name 获取 value，所以 print(chinese) 本质上就是下面这样 // print(locals[\"chinese\"]) v = PyDict_GetItemWithError(locals, name); if (v != NULL) { Py_INCREF(v); } else if (_PyErr_Occurred(tstate)) { goto error; } } // 否则说明 type(locals) is dict 为假，但 isinstance(locals, dict) 为真 else { // 通过泛型 API 获取元素 v = PyObject_GetItem(locals, name); if (v == NULL) { if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) goto error; _PyErr_Clear(tstate); } } // 如果 v 等于 NULL，说明 local 空间不存在 if (v == NULL) { // 那么从全局名字空间（global 名字空间）获取 v = PyDict_GetItemWithError(f->f_globals, name); // 如果 v 不等于 NULL，说明获取到了 if (v != NULL) { Py_INCREF(v); } // 否则说明 global 空间也不存在指定的 key // 这里检测一下是否有异常产生，有的话跳转到 error 标签 else if (_PyErr_Occurred(tstate)) { goto error; } // local 空间和 global 空间都没有，那么该去 builtin 空间查找了 else { // 逻辑和上面是类似的，如果查找不到，跳转到 error 标签，否则增加引用计数 if (PyDict_CheckExact(f->f_builtins)) { v = PyDict_GetItemWithError(f->f_builtins, name); if (v == NULL) { if (!_PyErr_Occurred(tstate)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } Py_INCREF(v); } else { v = PyObject_GetItem(f->f_builtins, name); if (v == NULL) { if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } } } } // 压入运行时栈 PUSH(v); DISPATCH();\n} 上面两条指令执行完之后，栈帧的布局就变成了下面这样： 接下来执行 16 BINARY_ADD，它会将栈里的两个元素弹出，然后执行加法操作，最后再将结果入栈。 当然上面这种说法是为了方便理解，其实虚拟机真正执行的时候，只会弹出一个元素，而另一个元素只是使用 TOP() 进行查看，但不弹出。等结果计算完毕之后，再将栈顶元素替换掉。 所以本质上，和弹出两个元素、再将计算结果入栈是一样的。 case TARGET(BINARY_ADD): { // 从栈顶弹出元素，这里是 99（变量 math） PyObject *right = POP(); // math 弹出之后，chinese 就成为了新的栈顶元素 // 这里的 TOP() 则是获取栈顶元素 89（变量 chinese） PyObject *left = TOP(); // 用于保存两者的和 PyObject *sum; // 如果是字符串，执行专门的函数 if (PyUnicode_CheckExact(left) && PyUnicode_CheckExact(right)) { sum = unicode_concatenate(tstate, left, right, f, next_instr); } // 否则通过泛型 API 进行计算 else { sum = PyNumber_Add(left, right); Py_DECREF(left); } // 减少元素的引用计数 Py_DECREF(right); // 将栈顶元素替换成 sum SET_TOP(sum); if (sum == NULL) goto error; DISPATCH();\n} BINARY_ADD 指令执行完之后，栈帧的布局就变成了下面这样： 然后 18 LOAD_NAME 负责将符号表中索引为 2 的变量 english 的值压入运行时栈，而指令 20 BINARY_ADD 则是继续执行加法操作，并将结果设置在栈顶，然后 22 LOAD_CONST 将常量 3 再压入运行时栈。 这三条指令执行之后，运行时栈的变化如下： 接着是 24 BINARY_TRUE_DIVIDE，它的逻辑和 BINARY_ADD 类似，只不过一个执行除法，一个执行加法。 case TARGET(BINARY_TRUE_DIVIDE): { // 从栈顶弹出元素，显然是 3 PyObject *divisor = POP(); // 查看栈顶元素，此时栈顶元素变成了 279 PyObject *dividend = TOP(); // 调用 PyNumber_TrueDivide，执行 279 / 3 PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); // 减少引用计数 Py_DECREF(dividend); Py_DECREF(divisor); // 将栈顶元素替换成 279 / 3 的计算结果 SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} 当 24 BINARY_TRUE_DIVIDE 执行完之后，运行时栈如下： 然后 26 STORE_NAME 将栈顶元素 93.0 弹出，并将符号表中索引为 3 的变量 avg 和它绑定起来，放到名字空间中。因此最终栈帧关系图如下： 以上就是虚拟机对这几行代码的执行流程，整个过程就像 CPU 执行指令一样。 我们再用 Python 代码描述一遍上面的逻辑： # LOAD_CONST 将 89 压入栈中，STORE_NAME 将 89 从栈中弹出\n# 并将符号 \"chinese\" 和 89 绑定起来，放在名字空间中\nchinese = 89\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89} math = 99\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99} english = 91\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91} avg = (chinese + math + english) / 3\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91, 'avg': 93.0} 现在你是不是对虚拟机执行字节码有更深的了解了呢？当然字节码指令非常多，不止我们上面看到的那几个。你可以随便写一些代码，然后分析一下它的字节码指令是什么。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 通过反编译查看字节码","id":"263","title":"通过反编译查看字节码"},"264":{"body":"到此，我们就深入源码，考察了虚拟机执行字节码的流程，帧评估函数虽然很长，也有那么一些复杂，但是核心逻辑不难理解。就是把自己当成一个 CPU，在栈帧中执行字节码指令。 下一篇文章我们来介绍一下常见的几个指令，并探讨不同的变量赋值语句的背后原理。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 小结","id":"264","title":"小结"},"265":{"body":"前面我们剖析了字节码的执行流程，本来应该接着介绍一些常见指令的，但因为有几个指令涉及到了局部变量，所以我们单独拿出来说。与此同时，我们还要再度考察一下 local 名字空间，它的背后还隐藏了很多内容。 我们知道函数的参数和函数内部定义的变量都属于局部变量，均是通过静态方式访问的。 x = 123 def foo1(): global x a = 1 b = 2 # co_nlocals 会返回局部变量的个数\n# a 和 b 是局部变量，x 是全局变量，因此是 2\nprint(foo1.__code__.co_nlocals) # 2 def foo2(a, b): pass print(foo2.__code__.co_nlocals) # 2 def foo3(a, b): a = 1 b = 2 c = 3 print(foo3.__code__.co_nlocals) # 3 无论是参数还是内部新创建的变量，本质上都是局部变量。 按照之前的理解，当访问一个全局变量时，会去访问 global 名字空间（也叫全局名字空间）。 那么问题来了，当操作函数的局部变量时，是不是也等价于操作其内部的 local 名字空间（局部名字空间）呢？我们往下看。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 楔子","id":"265","title":"楔子"},"266":{"body":"之前我们说过 Python 变量的访问是有规则的，会按照本地、闭包、全局、内置的顺序去查找，也就是 LEGB 规则，所以在查找变量时，local 名字空间应该是第一选择。 但不幸的是，虚拟机在为调用的函数创建栈帧对象时，这个至关重要的 local 名字空间并没有被创建。因为栈帧的 f_locals 字段和 f_globals 字段分别指向了局部名字空间和全局名字空间，而创建栈帧时 f_locals 被初始化成了 NULL，所以并没有创建局部名字空间。这里可能有人会有疑问，因为印象之中函数是有 local 空间的吧。 import inspect # 模块的栈帧\nframe = inspect.currentframe()\n# 对于模块而言，局部名字空间和全局名字空间是同一个字典\nprint(frame.f_locals is frame.f_globals) # True\n# 当然啦，局部名字空间和全局名字空间也可以通过内置函数获取\nprint( frame.f_locals is locals() is frame.f_globals is globals()\n) # True # 但对于函数而言就不一样了\ndef foo(): name = \"古明地觉\" return inspect.currentframe() frame = foo()\n# global 名字空间全局唯一\n# 无论是获取栈帧的 f_globals，还是调用 globals()，得到的都是同一份字典\nprint(frame.f_globals is globals()) # True\n# 但每个函数都有自己独立的局部名字空间\nprint(frame.f_locals) # {'name': '古明地觉'} # 咦，不是说局部名字空间被初始化为 NULL 吗？\n# 那么在 Python 里面获取的话，结果应该是个 None 才对啊\n# 关于这一点，我们稍后会解释 总之对于函数而言，在创建栈帧时，它的 f_locals 被初始化为 NULL。那么问题来了，局部变量到底存储在什么地方呢？当然，由于变量只是一个名字（符号），而局部变量的名字都存储在符号表中，所以更严谨的说法是，局部变量的值存储在什么地方？ 在介绍虚拟机执行字节码的时候我们说过，当函数被调用时，虚拟机会为其创建一个栈帧。栈帧是虚拟机的执行环境，包含了执行时所依赖的上下文，而栈帧内部有一个字段叫 f_localsplus，它是一个数组。 这个数组虽然是一段连续内存，但在逻辑上被分成了 4 份，其中局部变量便存储在 f_localsplus 的第一份空间中。现在我们明白了，局部变量是静态存储在数组中的。 我们举个例子。 def foo(a, b): c = a + b print(c) 它的字节码如下： // 加载局部变量 a，压入运行时栈\n2 0 LOAD_FAST 0 (a) // 加载局部变量 b，压入运行时栈 2 LOAD_FAST 1 (b) // 将 a 和 b 从栈中弹出，然后做加法运算，再将结果压入栈中 4 BINARY_ADD // 加载符号 c，弹出栈顶元素（a + b 的运算结果） // 然后将两者绑定起来，完成赋值语句 c = a + b 6 STORE_FAST 2 (c) // 加载变量 print，优先从 global 空间中加载 // 如果 global 空间里面没有，那么再从 builtin 空间中加载\n3 8 LOAD_GLOBAL 0 (print) // 加载局部变量 c 10 LOAD_FAST 2 (c) // 执行 print(c)，并将返回值压入栈中，print 的返回值是 None 12 CALL_FUNCTION 1 // 弹出栈顶的返回值，因为没有用变量保存，所以会直接丢弃 14 POP_TOP // 隐式的 return None 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 注意里面的 LOAD_FAST 和 STORE_FAST，这两个指令对应的逻辑如下。 case TARGET(LOAD_FAST): { // 通过宏 GETLOCAL 获取局部变量的值 PyObject *value = GETLOCAL(oparg); // 如果值为 NULL，抛出 UnboundLocalError if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } // 增加引用计数并压入运行时栈 Py_INCREF(value); PUSH(value); FAST_DISPATCH();\n} case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); // 获取栈顶元素 PyObject *value = POP(); // 通过宏 SETLOCAL 创建局部变量 SETLOCAL(oparg, value); FAST_DISPATCH();\n} 所以 LOAD_FAST 和 STORE_FAST 分别负责加载和创建局部变量，而核心就是里面的两个宏：GETLOCAL、SETLOCAL，这两个宏也是定义在帧评估函数里面的。 // Python/ceval.c // 在帧评估函数中，fastlocals 会被赋值为 f->f_localsplus\n#define GETLOCAL(i) (fastlocals[i]) #define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \\ GETLOCAL(i) = value; \\ Py_XDECREF(tmp); } while (0)\n/* 这里额外再补充一个关于 C 语言的知识点 * 我们看到宏 SETLOCAL 展开之后的结果是 do {...} while (0) * do while 循环会先执行 do 里面的循环体，然后再判断条件是否满足 * 因此从效果上来说，执行 do {...} while (0) 和直接执行 ... 是等价的 * 那么问题来了，既然效果等价，为啥还要再套一层 do while 呢 * 其实原因很简单，如果宏在展开之后会生成多条语句，那么这些语句要成为一个整体 * 另外由于 C 程序的语句要以分号结尾，所以在调用宏时，我们也会习惯性地在结尾加上分号 * 因此我们希望有这样一种结构，能同时满足以下要求： * 1）可以将多条语句包裹起来，作为一个整体； * 2）程序的语义不能发生改变； * 3）在语法上，要以分号结尾； * 显然 do while 完美满足以上三个要求，只需将 while 里的条件设置为 0 即可 * 并且当编译器看到 while (0) 时，也会进行优化，去掉不必要的循环控制结构 * 因此以后看到 do {...} while (0) 时，不要觉得奇怪，这是宏的一个常用技巧 */ 我们看到操作局部变量，就是在基于索引操作数组 f_localsplus，显然这个过程比操作字典要快。尽管字典是经过高度优化的，但显然再怎么优化，也不可能快过数组的静态操作。 所以此时我们对局部变量的藏身之处已经了然于心，它们就存放在栈帧的 f_localsplus 字段中，而之所以没有使用 local 名字空间的原因也很简单。因为函数内部的局部变量在编译时就已经确定了，个数是不会变的，因此编译时也能确定局部变量占用的内存大小，以及访问局部变量的字节码指令应该如何访问内存。 def foo(a, b): c = a + b print(c) print( foo.__code__.co_varnames\n) # ('a', 'b', 'c') 比如变量 c 位于符号表中索引为 2 的位置，这在编译时就已确定。 当创建变量 c 时，只需修改数组 f_localsplus 中索引为 2 的元素即可。 当访问变量 c 时，只需获取数组 f_localsplus 中索引为 2 的元素即可。 这个过程是基于数组索引实现的静态查找，所以操作局部变量和操作全局变量有着异曲同工之妙。操作全局变量本质上是基于 key 操作字典的 value，其中 key 是变量的名称，value 是变量的值；而操作局部变量本质上是基于索引操作数组 f_localsplus 的元素，这个索引就是变量名在符号表中的索引，对应的数组元素就是变量的值。 所以我们说 Python 的变量其实就是个名字，或者说符号，到这里是不是更加深刻地感受到了呢？ 但对于局部变量来说，如果想实现静态查找，显然要满足一个前提：变量名在符号表中的索引和与之绑定的值在 f_localsplus 中的索引必须是一致的。毫无疑问，两者肯定是一致的，并且索引是多少在编译阶段便已经确定，会作为指令参数保存在字节码指令序列中。 好，到此可以得出结论，虽然虚拟机为函数实现了 local 名字空间（初始为 NULL），但在操作局部变量时却没有使用它，原因就是为了更高的效率。当然还有所谓的 LEGB，都说变量查找会遵循这个规则，但我们心里清楚，局部变量其实是静态访问的，不过完全可以按照 LEGB 的方式来理解。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 如何访问（创建）一个局部变量","id":"266","title":"如何访问（创建）一个局部变量"},"267":{"body":"先来看一下全局名字空间： x = 1 def foo(): globals()[\"x\"] = 2 foo()\nprint(x) # 2 global 空间全局唯一，在 Python 层面上就是一个字典，在任何地方操作该字典，都相当于操作全局变量，即使是在函数内部。因此在执行完 foo() 之后，全局变量 x 就被修改了。但 local 名字空间也是如此吗？我们尝试一下。 def foo(): x = 1 locals()[\"x\"] = 2 print(x) foo() # 1 我们按照相同的套路，却并没有成功，这是为什么？原因就是上面解释的那样，函数内部有哪些局部变量在编译时就已经确定了，查询的时候是从数组 f_localsplus 中静态查找的，而不是从 local 名字空间中查找。 然后我们打印一下 local 名字空间，看看里面都有哪些内容。 def foo(): name = \"satori\" print(locals()) age = 17 print(locals()) gender = \"female\" print(locals()) foo()\n\"\"\"\n{'name': 'satori'}\n{'name': 'satori', 'age': 17}\n{'name': 'satori', 'age': 17, 'gender': 'female'}\n\"\"\" 我们看到打印 locals() 居然也会显示内部的局部变量，相信聪明如你已经猜到 locals() 是怎么回事了。符号表里面存储了局部变量的符号（或者说名字），f_localsplus 里面存储了局部变量的值，当执行 locals() 的时候，会基于符号表和 f_localsplus 创建一个字典出来。 def foo(): name = \"satori\" age = 17 gender = \"female\" print(locals()) # 符号表：保存了函数中创建的局部变量的名字\nprint(foo.__code__.co_varnames)\n\"\"\"\n('name', 'age', 'gender')\n\"\"\"\n# 调用函数时会创建栈帧，局部变量的值都保存在 f_localsplus 里面\n# 并且符号表中变量名的顺序和 f_localsplus 中变量值的顺序是一致的\nf_localsplus = [\"satori\", 17, \"female\"]\n# 这里就用一个列表来模拟了 我们来看一下变量的创建。 由于符号 name 位于符号表中索引为 0 的位置，那么执行 name = \"satori\" 时，就会将 \"satori\" 放在 f_localsplus 中索引为 0 的位置。 由于符号 age 位于符号表中索引为 1 的位置，那么执行 age = 17 时，就会将 17 放在 f_localsplus 中索引为 1 的位置。 由于符号 gender 位于符号表中索引为 2 的位置，那么执行 gender = \"female\" 时，就会将 \"female\" 放在 f_localsplus 中索引为 2 的位置。 后续在访问变量的时候，比如访问变量 age，由于它位于符号表中索引为 1 的位置，那么就会通过 f_localsplus[1] 获取它的值，这些符号对应的索引都是在编译阶段确定的。所以在运行时才能实现静态查找，指令 LOAD_FAST 和 STORE_FAST 都是基于索引来静态操作底层数组。 我们用一张图来描述这个过程： 符号表负责存储局部变量的名字，f_localsplus 负责存储局部变量的值（里面的元素初始为 NULL），而在给局部变量赋值的时候，本质上就是将值写在了 f_localsplus 中。并且变量名在符号表中的索引，和变量值在 f_localsplus 中的索引是一致的，因此操作局部变量本质上就是在操作 f_localsplus 数组。至于 locals() 或者说局部名字空间，它是基于符号表和 f_localsplus 动态创建的，为了方便我们获取已存在的局部变量，执行 locals() 会临时创建一个字典（只会创建一次）。 所以我们通过 locals() 获取局部名字空间之后，访问里面的局部变量是可以的，只不过此时将静态访问变成了动态访问。 def foo(): name = \"satori\" # 会从 f_localsplus 中静态查找 print(name) # 先基于已有的变量和值创建一个字典 # 然后通过字典实现变量的动态查找 print(locals()[\"name\"]) foo()\n\"\"\"\nsatori\nsatori\n\"\"\" 两种方式都是可以的，但基于 locals() 来访问，在效率上明显会低一些。 另外基于 locals() 访问一个变量是可以的，但无法创建一个变量。 def foo(): name = \"satori\" locals()[\"age\"] = 17 try: print(age) except NameError as e: print(e) foo()\n\"\"\"\nname 'age' is not defined\n\"\"\" 局部变量是静态存储在数组里的，locals() 只是做了一个拷贝而已。往局部名字空间里面添加一个键值对，不等于创建一个局部变量，因为局部变量不是从它这里查找的，因此代码中打印 age 报错了。但如果外部还有一个全局变量 age 的话，那么会打印全局变量 age。 然后再补充一点，我们说全局名字空间在任何地方都是唯一的，而对于函数而言，它的局部名字空间在整个函数内部也是唯一的。不管调用 locals 多少次，拿到的都是同一个字典。 def foo(): name = \"satori\" # 执行 locals() 的时候，内部只有一个键值对 d = locals() print(d) # {'name': 'satori'} # 再次获取，此时有两个键值对 print(locals()) # {'name': 'satori', 'd': {...}} # 但两者的 id 相同，因为一个函数只有一个局部名字空间 # 不管调用多少次 locals()，拿到的都是同一个字典 print(id(d) == id(locals())) # True foo() 所以 locals() 和 globals() 指向的名字空间都是唯一的，只不过 locals() 是在某个函数内部唯一，而 globals() 在所有地方都唯一。 因此局部名字空间初始为 NULL，但在第一次执行 locals() 时，会以符号表中的符号作为 key，f_localsplus 中的值作为 value，创建一个字典作为函数的局部名字空间。而后续再执行 locals() 的时候，由于名字空间已存在，就不会再次创建了，直接基于当前的局部变量对字典进行更新即可。 def foo(): # 创建一个字典，由于当前还没有定义局部变量，因此是空字典 print(locals()) # {} # 往局部名字空间添加一个键值对 locals()[\"a\"] = \"b\" print(locals()) # {'a': 'b'} # 定义一个局部变量 name = \"satori\" # 由于局部名字空间已存在，因此不会再次创建 # 直接将局部变量的名字作为 key、值作为 value，拷贝到字典中 print(locals()) # {'a': 'b', 'name': 'satori'} foo() 注意：虽然局部名字空间里面存在 \"a\" 这个 key，但 a 这个局部变量是不存在的。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 解密 local 名字空间","id":"267","title":"解密 local 名字空间"},"268":{"body":"目前我们已经知道 local 名字空间是怎么创建的了，也熟悉了它的特性，下面通过源码来看一下它的构建过程。 // Python/bltinmodule.c static PyObject *\nbuiltin_locals_impl(PyObject *module)\n{ PyObject *d; // Python 内置函数的源码实现位于 bltinmodule.c 中 // 这里又调用了 PyEval_GetLocals d = PyEval_GetLocals(); Py_XINCREF(d); return d;\n} // Python/ceval.c\nPyObject *\nPyEval_GetLocals(void)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); // 拿到当前栈桢 PyFrameObject *current_frame = _PyEval_GetFrame(tstate); if (current_frame == NULL) { _PyErr_SetString(tstate, PyExc_SystemError, \"frame does not exist\"); return NULL; } // 调用 PyFrame_FastToLocalsWithError 创建 local 名字空间 // 并赋值给 current_frame->f_locals if (PyFrame_FastToLocalsWithError(current_frame) < 0) { return NULL; } assert(current_frame->f_locals != NULL); // 返回 current_frame->f_locals return current_frame->f_locals;\n} // Objects/frameobject.c\nint\nPyFrame_FastToLocalsWithError(PyFrameObject *f)\n{ PyObject *locals, *map; PyObject **fast; PyCodeObject *co; Py_ssize_t j; Py_ssize_t ncells, nfreevars; // 栈桢不能为空 if (f == NULL) { PyErr_BadInternalCall(); return -1; } // 获取局部名字空间 locals = f->f_locals; // 如果为 NULL，那么创建一个新字典，作为名字空间 // 所以局部名字空间只会创建一次，后续不会再创建 if (locals == NULL) { locals = f->f_locals = PyDict_New(); if (locals == NULL) return -1; } // 获取 PyCodeObject 对象 co = f->f_code; // 拿到内部的符号表（一个元组），里面保存了函数局部变量的名字 map = co->co_varnames; if (!PyTuple_Check(map)) { PyErr_Format(PyExc_SystemError, \"co_varnames must be a tuple, not %s\", Py_TYPE(map)->tp_name); return -1; } // 获取 f_localsplus，它里面保存了局部变量的值 // 只不过除了局部变量的值之外，还保存了其它的 fast = f->f_localsplus; // 那么 f_localsplus 里面到底有多少个局部变量的值呢？显然这要基于符号表来判断 // co_varnames 里面保存了多少个符号，f_localsplus 里面就保存了多少个局部变量的值 j = PyTuple_GET_SIZE(map); if (j > co->co_nlocals) // 理论上符号表的长度和局部变量的个数（co_nlocals）是相等的 // 但如果超过了 co_nlocals，那么让它等于 co_nlocals j = co->co_nlocals; // 如果 co_nlocals 大于 0，证明存在局部变量，那么调用 map_to_dict // 将 co_varnames 和 f_localsplus 里的元素组成键值对，添加到局部名字空间中 if (co->co_nlocals) { // 相当于 locals.update(zip(co_varnames, f_localsplus)) if (map_to_dict(map, j, locals, fast, 0) < 0) return -1; } // 如果里面有 cell 变量和 free 变量的话，也会添加到局部名字空间中 // 关于 cell 变量和 free 变量，由于它们和闭包相关，所以等介绍闭包的时候再说 ncells = PyTuple_GET_SIZE(co->co_cellvars); nfreevars = PyTuple_GET_SIZE(co->co_freevars); if (ncells || nfreevars) { if (map_to_dict(co->co_cellvars, ncells, locals, fast + co->co_nlocals, 1)) return -1; if (co->co_flags & CO_OPTIMIZED) { if (map_to_dict(co->co_freevars, nfreevars, locals, fast + co->co_nlocals + ncells, 1) < 0) return -1; } } return 0;\n} 可以看到，源码的实现逻辑和我们之前分析的是一样的。 变量 map 是符号表 co_varnames，保存了局部变量的名字； 变量 fast 是 f_localsplus，保存了局部变量的值； 变量 j 是局部变量的个数； 变量 locals 是局部名字空间； 然后将它们作为参数，传递给 map_to_dict 函数，该函数内部会进行遍历，按照顺序将变量名和变量值依次添加到局部名字空间中。然后我们再来看一下 map_to_dict 函数，它内部有一处细节非常之关键。 // Objects/frameobject.c static int\nmap_to_dict(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values, int deref)\n{ Py_ssize_t j; assert(PyTuple_Check(map)); assert(PyDict_Check(dict)); assert(PyTuple_Size(map) >= nmap); // nmap 表示局部变量的个数 for (j=0; j < nmap; j++) { // 从符号表中获取符号（变量名） PyObject *key = PyTuple_GET_ITEM(map, j); // values 就是 f_localsplus，然后获取变量的值 PyObject *value = values[j]; assert(PyUnicode_Check(key)); // 闭包变量相关，等介绍闭包的时候再说，由于当前不存在闭包，所以先忽略掉 if (deref && value != NULL) { assert(PyCell_Check(value)); value = PyCell_GET(value); } // 注意这一步：检测 value 是否等于 NULL，那么问题来了，什么时候 value 会等于 NULL 呢？ // 之前说了，局部变量有哪些在编译的时候就确定了，保存在符号表中，局部变量的值保存在 f_localsplus 中 // 在局部变量还没有赋值的时候，它在 f_localsplus 中对应的值就是 NULL // 而给一个局部变量赋值，本质上就是在修改 f_localsplus // 假设一个函数的符号表为 (\"a\", \"b\", \"c\")，在给变量 c 赋值之前调用了 locals() // 那么在获取变量 c 对应的值时，拿到的就是一个 NULL if (value == NULL) { // 如果某个符号对应的值为 NULL，则说明在获取名字空间时，该变量还没有被赋值 // 那么当该符号在 local 空间中已存在时，还要将它删掉。这一步非常关键，它的作用我们稍后会说 if (PyObject_DelItem(dict, key) != 0) { if (PyErr_ExceptionMatches(PyExc_KeyError)) PyErr_Clear(); else return -1; } } // 如果 value 不等于 NULL，说明变量已经完成了和某个值的绑定，于是将它们组成键值对拷贝到 local 空间中 else { if (PyObject_SetItem(dict, key, value) != 0) return -1; } } return 0;\n} 以上就是 local 名字空间的获取过程在源码层面的体现。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间的创建过程","id":"268","title":"local 名字空间的创建过程"},"269":{"body":"我们再来搭配 exec 关键字，结果会更加明显。首先 exec 函数可以将一段字符串当成代码来执行，并将执行结果体现在当前的名字空间中。 def foo(): print(locals()) # {} exec(\"x = 1\") print(locals()) # {'x': 1} try: print(x) except NameError as e: print(e) # name 'x' is not defined foo() 尽管 locals() 变了，但是依旧访问不到 x，因为虚拟机并不知道 exec(\"x = 1\") 是创建一个局部变量，它只知道这是一个函数调用。 事实上 exec 会作为一个独立的编译单元来执行，并且有自己的作用域。 所以 exec(\"x = 1\") 执行完之后，效果就是改变了局部名字空间，里面多了一个 \"x\": 1 键值对。但关键的是，局部变量 x 不是从局部名字空间中查找的，exec 终究还是错付了人。而由于函数 foo 对应的 PyCodeObject 对象的符号表中并没有 x 这个符号，所以报错了。 补充：exec 默认影响的是 local 名字空间，如果在执行时发现 local 名字空间为 NULL，那么会自动创建一个。所以调用 exec 也可以创建名字空间（当它为 NULL 时）。 exec(\"x = 1\")\nprint(x) # 1 如果放在模块里面是可以的，因为模块的 local 名字空间和 global 名字空间指向同一个字典，所以 global 名字空间会多一个 key 为 \"x\" 的键值对。而全局变量是从 global 名字空间中查找的，所以这里没有问题。 def foo(): # 此时 exec 影响的是 global 名字空间 exec(\"x = 123\", globals()) # 所以这里不会报错, 但此时的 x 不是局部变量, 而是全局变量 print(x) foo()\nprint(x)\n\"\"\"\n123\n123\n\"\"\" 可以给 exec 指定要影响的名字空间，代码中 exec 影响的是全局名字空间，打印的 x 也是全局变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间与 exec 函数","id":"269","title":"local 名字空间与 exec 函数"},"27":{"body":"前面我们介绍了 Python 对象在底层的数据结构，知道了 Python 底层是通过 PyObject 实现了对象的多态。所以我们先来分析一下 Python 为什么慢？ 在 Python 中创建一个对象，会分配内存并进行初始化，然后用一个 PyObject * 指针来维护这个对象，当然所有对象都是如此。因为指针是可以相互转化的，所以变量在保存一个对象的指针时，会将指针转成 PyObject * 之后再交给变量保存。 因此在 Python 中，变量的传递（包括函数的参数传递）实际上传递的都是泛型指针 PyObject *。这个指针具体指向什么类型的对象我们并不知道，只能通过其内部的 ob_type 字段进行动态判断，而正是因为这个 ob_type，Python 实现了多态机制。 比如 a.pop()，我们不知道 a 指向的对象是什么类型，它可能是列表、也可能是字典，或者是我们实现了 pop 方法的自定义类的实例对象。至于它到底是什么类型，只能通过 ob_type 动态判断。 如果 a 的 ob_type 为 &PyList_Type，那么 a 指向的对象就是列表，于是会调用 list 类型中定义的 pop 操作。如果 a 的 ob_type 为 &PyDict_Type，那么 a 指向的对象就是字典，于是会调用 dict 类型中定义的 pop 操作。所以变量 a 在不同的情况下，会表现出不同的行为，这正是 Python 多态的核心所在。 再比如列表，它内部的元素也都是 PyObject *，因为类型要保持一致，所以对象的指针不能直接存（因为类型不同），而是需要统一转成泛型指针 PyObject * 之后才可以存储。当我们通过索引获取到该指针进行操作的时候，也会先通过 ob_type 判断它的类型，看它是否支持指定的操作。所以操作容器内的某个元素，和操作一个变量并无本质上的区别，它们都是 PyObject *。 从这里我们也能看出 Python 为什么慢了，因为有一部分时间浪费在类型和属性的查找上面。 以变量 a + b 为例，这个 a 和 b 指向的对象可以是整数、浮点数、字符串、列表、元组、以及实现了 __add__ 方法的类的实例对象。因为 Python 的变量都是 PyObject *，所以它可以指向任意的对象，这就意味着 Python 无法做基于类型的优化。 底层在执行 a + b 时，首先要通过 ob_type 判断变量指向的对象是什么类型，这在 C 的层面需要一次属性查找。然后 Python 将每一个算术操作都抽象成了一个魔法方法，所以实例相加时要在类型对象中找到该方法对应的函数指针，这又是一次属性查找。找到了之后将 a、b 作为参数传递进去，这会产生一次函数调用，将对象维护的值拿出来进行运算，然后根据相加的结果创建一个新的对象，再将新的对象的指针转成 PyObject * 之后返回。 所以一个简单的加法运算，Python 内部居然做了这么多的工作，要是再放到循环里面，那么上面的步骤要重复 N 次。而对于 C 来讲，由于已经规定好了类型，所以 a + b 在编译之后就是一条简单的机器指令，因此两者在效率上差别很大。 当然我们不是来吐槽 Python 效率的问题，因为任何语言都有擅长的一面和不擅长的一面，这里只是通过回顾前面的知识来解释为什么 Python 效率低。因此当别人问你 Python 为什么效率低的时候，希望你能从这个角度来回答它，主要就两点： Python 无法基于类型做优化； Python 对象基本都存储在堆上； 建议不要一上来就谈 GIL，那是在多线程情况下才需要考虑的问题。而且我相信大部分觉得 Python 慢的人，都不是因为 Python 无法利用多核才觉得慢的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 为什么这么慢","id":"27","title":"Python 为什么这么慢"},"270":{"body":"我们说 exec 的执行效果会体现在 local 名字空间中，但是需要考虑变量名冲突的问题。举个例子： def foo(): exec(\"x = 1\") print(locals()[\"x\"]) foo()\n\"\"\"\n1\n\"\"\" def bar(): exec(\"x = 1\") print(locals()[\"x\"]) x = 123 bar()\n\"\"\"\nTraceback (most recent call last): File ..... bar() File ..... print(locals()[\"x\"])\nKeyError: 'x'\n\"\"\" 这是什么情况？函数 bar 只是多了一行赋值语句，为啥就报错了呢？要想搞懂这个问题，首先要明确两点： 1）函数的局部变量在编译的时候就已经确定，并存储在对应的 PyCodeObject 对象的符号表 (co_varnames) 中，这是由语法规则所决定的； 2）函数内的局部变量在其整个作用域范围内都是可见的； 对于 foo 函数来说，exec 执行完之后相当于往 local 名字空间中添加一个键值对，这没有问题。对于 bar 函数而言也是如此，在执行完 exec(\"x = 1\") 之后，local 名字空间中也会存在 \"x\": 1 这个键值对，但下面执行 locals() 的时候又把字典更新了。因为局部变量可以在函数的任意位置创建，或者修改，所以每一次执行 locals() 的时候，都会遍历符号表和 f_localsplus，组成键值对将原来的字典更新一遍。 在 bar 函数里面有一行 x = 123，所以知道函数里面存在局部变量 x，符号表里面也会有 \"x\" 这个符号，这是在编译时就确定的。但我们是在 x = 123 之前调用的 locals，所以此时符号 x 在 f_localsplus 中对应的值还是一个 NULL，没有指向一个合法的 PyObject。换句话说就是，知道里面存在局部变量 x，但是还没有来得及赋值。 然后在更新名字空间的时候，如果发现值是个 NULL，那么就把名字空间中该变量对应的键值对给删掉。 我们回顾一下 map_to_dict 函数： 所以 bar 函数执行 locals()[\"x\"] 的时候，会先获取名字空间，原本里面是有 \"x\": 1 这个键值对的。但因为赋值语句 x = 123 的存在，导致符号表里面存在 \"x\" 这个符号，但执行 locals() 的时候又尚未完成赋值，所以值为 NULL，于是又把这个键值对给删掉了。所以执行 locals()[\"x\"] 的时候，出现了 KeyError。 因为局部名字空间体现的是局部变量的值，而调用 locals 的时候，局部变量 x 还没有被创建。所以 locals() 里面不应该存在 key 为 \"x\" 的键值对，于是会将它删除。 我们将名字空间打印一下： def foo(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 但当前不存在局部变量，所以名字空间仍是 {\"x\": 1} print(locals()) def bar(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 由于里面存在局部变量 x，但尚未赋值 # 于是将字典中 key 为 \"x\" 的键值对给删掉 # 所以名字空间变成了 {} print(locals()) x = 123 foo() # {'x': 1}\nbar() # {} 上面代码中，局部变量的创建发生在 exec 之后，如果发生在 exec 之前也是相同的结果。 def foo(): exec(\"x = 2\") print(locals()) foo() # {'x': 2} def bar(): x = 1 exec(\"x = 2\") print(locals()) bar() # {'x': 1} 在 exec(\"x = 2\") 执行之后，名字空间也变成了 {\"x\": 2}。但从源码中我们看到，每次调用 locals，都会遍历符号表和 f_localsplus，对字典进行更新，所以在 bar 函数里面获取名字空间的时候，又把 \"x\" 对应的 value 给更新回来了。 当然这是在变量冲突的情况下，会保存真实存在的局部变量的值。但如果不冲突，比如 bar 函数里面是 exec(\"y = 2\")，那么 locals() 里面就会存在两个键值对。但只有 x 才是真正的局部变量，而 y 则不是。 将 exec(\"x = 2\") 换成 locals()[\"x\"] = 2 也是一样的效果，它们都是往局部名字空间中添加一个键值对，但不会创建一个局部变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 变量名冲突的问题","id":"270","title":"变量名冲突的问题"},"271":{"body":"当 Python 中混进一只薛定谔的猫…… ，这是猫哥在 19 年更新的一篇文章，里面探讨的内容我们本文的主题是重叠的。猫哥在文章中举了几个疑惑重重的例子，看看用上面学到的内容能不能合理地解释。 # 例 0\ndef foo(): exec('y = 1 + 1') z = locals()['y'] print(z) foo()\n# 输出：2 # 例 1\ndef foo(): exec('y = 1 + 1') y = locals()['y'] print(y) foo()\n# 报错：KeyError: 'y' 以上是猫哥文章中举的示例，首先例 0 很简单，因为 exec 影响了所在的局部名字空间，里面存在 \"y\": 2 这个键值对。至于里面的变量 z 则不影响，因为我们获取的是 \"y\" 这个 key 对应的 value。 但例 1 则不同，因为 Python 在语法解析的时候发现了 y = ... 这样的赋值语句，那么它在编译的时候就知道函数里面存在 y 这个局部变量，并写入符号表中。既然符号表中存在，那么调用 locals 的时候就会对它进行更新。但是对 y 赋值是发生在调用 locals 之后，所以在调用 locals 的时候，y 的值还是一个 NULL，也就是变量还没有赋值。所以会将名字空间中的 \"y\": 2 这个键值对给删掉，于是报出 KeyError 错误。 再来看看猫哥文章的例 2： # 例 2\ndef foo(): y = 1 + 1 y = locals()['y'] print(y) foo()\n# 输出：2 locals() 是对真实存在的局部变量的一个拷贝，在调用 locals 之前 y 就已经创建好了。符号表里面有 \"y\"，f_localsplus 里面有一个数值 2，所以调用 locals() 的时候，会得到 {\"y\": 2}，因此函数执行正常。 猫哥文章的例 3： # 例3\ndef foo(): exec('y = 1 + 1') boc = locals() y = boc['y'] print(y) foo()\n# KeyError: 'y' 这个例3 和例1 是一样的，只不过用变量 boc 将局部名字空间保存起来了。执行 exec 的时候，会创建局部名字空间，写入键值对 \"y\": 2。但调用 locals 的时候，发现函数内部存在局部变量 y 并且还尚未赋值，于是又会将 \"y\": 2 这个键值对给删掉，因此 boc 变成了一个空字典。 所以在执行 y = boc[\"y\"] 的时候会出现 KeyError。 猫哥文章的例 4： # 例4\ndef foo(): boc = locals() exec('y = 1 + 1') y = boc['y'] print(y) foo()\n# 输出：2 显然在调用 locals 的时候，会返回一个空字典，因为此时的局部变量都还没有赋值。但需要注意的是：boc 已经指向了局部名字空间（字典），而局部名字空间在一个函数里面也是唯一的。所以 exec(\"y = 1 + 1\") 执行之后，会往局部名字空间里面写入一个键值对，而变量 boc 指向的字典也会发生改变，因为是同一个字典，所以程序正常执行。 猫哥文章的例 5： # 例5\ndef foo(): boc = locals() exec('y = 1 + 1') print(locals()) y = boc['y'] print(y) foo()\n# {'boc': {...}} # KeyError: 'y' 首先在执行 boc = locals() 之后，boc 会指向一个空字典，然后 exec 函数执行之后会往字典里面写入一个键值对 \"y\": 2。如果在 exec 执行之后，直接执行 y = boc[\"y\"]，那么代码是没有问题的，但问题是执行之前插入了一个 print(locals())。 我们说过，当调用 locals 的时候，会对名字空间进行更新，然后返回更新之后的名字空间。由于函数内部存在 y = ... 这样的赋值语句，所以符号表中就存在 \"y\" 这个符号，于是会进行更新。但更新的时候，发现 y 还没有被赋值，于是又将字典中的键值对 \"y\": 2 给删掉了。 由于局部名字空间只有一份，所以 boc 指向的字典也会发生改变，换句话说在 print(locals()) 之后，boc 就指向了一个空字典，因此执行 y = boc[\"y\"] 时会出现 KeyError。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 薛定谔的猫","id":"271","title":"薛定谔的猫"},"272":{"body":"以上我们就探讨了 local 名字空间相关的内容，它是一个字典，是对真实存在的局部变量的一个拷贝，每当我们调用 locals，都会拷贝一次（但字典只会存在一份）。 然后函数的局部变量都是静态存储的，编译时就已经确定，无法在运行时动态添加。我们往局部名字空间里面添加键值对，并不等价于创建局部变量。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 小结","id":"272","title":"小结"},"273":{"body":"前面我们考察了虚拟机执行字节码指令的原理，那么本篇文章就来看看这些指令对应的逻辑是怎样的，每个指令都做了哪些事情。当然啦，由于字节码指令有一两百个，我们没办法逐一分析，这里会介绍一些常见的。至于其它的指令，会随着学习的深入，慢慢揭晓。 介绍完常见指令之后，我们会探讨 Python 赋值语句的背后原理，并分析它们的差异。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 楔子","id":"273","title":"楔子"},"274":{"body":"有一部分指令出现的频率极高，非常常用，我们来看一下。 LOAD_CONST：加载一个常量； LOAD_FAST：在局部作用域中加载一个局部变量； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量； LOAD_NAME：在全局作用域中加载一个全局变量或内置变量； STORE_FAST：在局部作用域中定义一个局部变量，来建立和某个对象之间的映射关系； STORE_GLOBAL：在局部作用域中定义一个使用 global 关键字声明的全局变量，来建立和某个对象之间的映射关系； STORE_NAME：在全局作用域中定义一个全局变量，来建议和某个对象之间的映射关系； 我们举例说明： import dis name = \"古明地觉\" def foo(): age = 16 print(age) global name print(name) name = \"古明地恋\" dis.dis(foo)\n\"\"\" 6 0 LOAD_CONST 1 (16) 2 STORE_FAST 0 (age) 7 4 LOAD_GLOBAL 0 (print) 6 LOAD_FAST 0 (age) 8 CALL_FUNCTION 1 10 POP_TOP 9 12 LOAD_GLOBAL 0 (print) 14 LOAD_GLOBAL 1 (name) 16 CALL_FUNCTION 1 18 POP_TOP 10 20 LOAD_CONST 2 ('古明地恋') 22 STORE_GLOBAL 1 (name) 24 LOAD_CONST 0 (None) 26 RETURN_VALUE\n\"\"\" 我们看到 age = 16 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 16； STORE_FAST：在局部作用域中创建一个局部变量，这里是 age； print(age) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_FAST：在局部作用域中加载一个局部变量，这里是 age； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； print(name) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 name； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； name = \"古明地恋\" 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 \"古明地恋\"； STORE_GLOBAL：在局部作用域中创建一个 global 关键字声明的全局变量，这里是 name； 这些指令非常常见，因为它们和常量、变量的加载，以及变量的定义密切相关，你写的任何代码在反编译之后都少不了它们的身影。 注：不管加载的是常量、还是变量，得到的永远是指向对象的指针。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 常用指令","id":"274","title":"常用指令"},"275":{"body":"这里再通过变量赋值感受一下字节码的执行过程，首先关于变量赋值，你平时是怎么做的呢？ 这些赋值语句背后的原理是什么呢？我们通过字节码来逐一回答。 1）a, b = b, a 的背后原理是什么？ 想要知道背后的原理，查看它的字节码是我们最好的选择。 1 0 LOAD_NAME 0 (b) 2 LOAD_NAME 1 (a) 4 ROT_TWO 6 STORE_NAME 1 (a) 8 STORE_NAME 0 (b) 10 LOAD_CONST 0 (None) 12 RETURN_VALUE 里面关键的就是 ROT_TWO 指令，虽然我们还没看这个指令，但也能猜出来它负责交换栈里面的两个元素。假设 a 和 b 的值分别为 22、33，看一下运行时栈的变化过程。 示意图还是很好理解的，关键就在于 ROT_TWO 指令，它是怎么交换元素的呢？ case TARGET(ROT_TWO): { // 获取栈顶元素 PyObject *top = TOP(); // 获取从栈顶开始的第二个元素（栈底元素） PyObject *second = SECOND(); // 将栈顶元素设置为 second，将栈的第二个元素设置为 top // 完成两个元素之间的交换 SET_TOP(second); SET_SECOND(top); FAST_DISPATCH();\n} 执行 ROT_TWO 指令之前，栈里有两个元素，栈顶元素是 a，栈底元素是 b。执行 ROT_TWO 指令之后，栈顶元素是 b，栈底元素是 a。然后后面的两个 STORE_NAME 会将栈里面的元素 b、a 依次弹出，赋值给 a、b，从而完成变量交换。 2）a, b, c = c, b, a 的背后原理是什么？ 老规矩，还是查看字节码，因为一切真相都隐藏在字节码当中。 1 0 LOAD_NAME 0 (c) 2 LOAD_NAME 1 (b) 4 LOAD_NAME 2 (a) 6 ROT_THREE 8 ROT_TWO 10 STORE_NAME 2 (a) 12 STORE_NAME 1 (b) 14 STORE_NAME 0 (c) 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 整个过程和 a, b = b, a 是相似的，首先 LOAD_NAME 将变量 c、b、a 依次压入栈中。由于栈先入后出的特性，此时栈的三个元素按照顺序（从栈顶到栈底）分别是 a、b、c。然后是 ROT_THREE 和 ROT_TWO，毫无疑问，这两个指令执行完之后，会将栈的三个元素调换顺序，也就是将 a、b、c 变成 c、b、a。最后 STORE_NAME 将栈的三个元素 c、b、a 依次弹出，分别赋值给 a、b、c，从而完成变量的交换。 因此核心就在 ROT_THREE 和 ROT_TWO 上面，由于后者上面已经说过了，所以我们看一下 ROT_THREE。 case TARGET(ROT_THREE): { PyObject *top = TOP(); PyObject *second = SECOND(); PyObject *third = THIRD(); SET_TOP(second); SET_SECOND(third); SET_THIRD(top); FAST_DISPATCH();\n} 栈顶元素是 top、栈的第二个元素是 second、栈的第三个元素是 third，然后将栈顶元素设置为 second、栈的第二个元素设置为 third、栈的第三个元素设置为 top。所以栈里面的 a、b、c 在经过 ROT_THREE 之后就变成了 b、c、a，显然这还不是正确的结果。于是继续执行 ROT_TWO，将栈的前两个元素进行交换，执行完之后就变成了 c、b、a。 假设 a、b、c 的值分别为 \"a\"、\"b\"、\"c\"，整个过程如下： 对于多元赋值来说，解释器的做法是固定的，首先按照从左往右的顺序，将等号右边的变量依次压入栈中，然后在栈里面对元素做处理，最后再将栈里的元素弹出，仍旧按照从左往右的顺序，依次赋值给等号左边的变量。 另外这里为了交换栈里的三个元素，使用了两个指令，但其实一个指令就够了，只需将栈顶元素和栈底元素进行交换即可，因为中间的元素是不需要动的。而在之后的版本中，官方优化了这个逻辑。 3）a, b, c, d = d, c, b, a 的背后原理是什么？它和上面提到的 1）和 2）有什么区别呢？ 我们还是看一下字节码。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_TUPLE 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 将等号右边的变量，按照从左往右的顺序，依次压入栈中，但此时没有直接将栈里面的元素做交换，而是构建一个元组。因为往栈里面压入了四个元素，所以 BUILD_TUPLE 后面的 oparg 是 4，表示构建长度为 4 的元组。 case TARGET(BUILD_TUPLE): { // 元素从栈顶到栈底依次是 a、b、c、d PyObject *tup = PyTuple_New(oparg); if (tup == NULL) goto error; // 将元素依次弹出，弹出的顺序也是 a、b、c、d // 但是注意循环，元素是从后往前设置的 // 所以 item[3], item[2], item[1], item[0] = a, b, c, d while (--oparg >= 0) { PyObject *item = POP(); PyTuple_SET_ITEM(tup, oparg, item); } // 将元组 item 压入栈中，元组为 (d, c, b, a) PUSH(tup); DISPATCH();\n} 此时栈里面只有一个元素，指向一个元组。接下来是 UNPACK_SEQUENCE，负责对序列进行解包，它的指令参数也是 4，表示要解包的序列的长度为 4，我们来看看它的逻辑。 case TARGET(UNPACK_SEQUENCE): { PREDICTED(UNPACK_SEQUENCE); // seq：从栈里面弹出的元组 (d, c, b, a) // item：用于遍历元素 // items：指向一个 PyObject * 类型的数组 PyObject *seq = POP(), *item, **items; if (PyTuple_CheckExact(seq) && PyTuple_GET_SIZE(seq) == oparg) { // 获取元组内部的 ob_item 字段，元素就存储在它指向的数组中 items = ((PyTupleObject *)seq)->ob_item; // 遍历内部的每一个元素，并依次压入栈中 // 由于是从后往前遍历的，所以遍历的元素依次是 a b c d // 但在压入栈中之后，元素从栈顶到栈底就变成了 d c b a while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } else if (PyList_CheckExact(seq) && PyList_GET_SIZE(seq) == oparg) { // 该指令同样适用于列表，逻辑一样（一会儿会看到） items = ((PyListObject *)seq)->ob_item; while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } // ... Py_DECREF(seq); DISPATCH();\n} 最后 STORE_NAME 将 d c b a 依次弹出，赋值给变量 a b c d，从而完成变量交换。所以当交换的变量多了之后，不会直接在运行时栈里面操作，而是将栈里面的元素挨个弹出，构建元组；然后再按照指定顺序，将元组里面的元素重新压到栈里面。 假设变量 a b c d 的值分别为 1 2 3 4，我们画图来描述一下整个过程。 不管是哪一种做法，Python 在进行变量交换时所做的事情是不变的，核心分为三步走。首先将等号右边的变量，按照从左往右的顺序，依次压入栈中；然后对运行时栈里面元素的顺序进行调整；最后再将运行时栈里面的元素挨个弹出，还是按照从左往右的顺序，再依次赋值给等号左边的变量。 只不过当变量不多时，调整元素位置会直接基于栈进行操作；而当达到四个时，则需要额外借助于元组。 然后多元赋值也是同理，比如 a, b, c = 1, 2, 3，看一下它的字节码。 1 0 LOAD_CONST 0 ((1, 2, 3)) 2 UNPACK_SEQUENCE 3 4 STORE_NAME 0 (a) 6 STORE_NAME 1 (b) 8 STORE_NAME 2 (c) 10 LOAD_CONST 1 (None) 12 RETURN_VALUE 元组直接作为一个常量被加载进来了，然后解包，再依次赋值。 4）a, b, c, d = d, c, b, a 和 a, b, c, d = [d, c, b, a] 有区别吗？ 答案是没有区别，两者在反编译之后对应的字节码指令只有一处不同。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_LIST 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 前者是 BUILD_TUPLE，现在变成了 BUILD_LIST，其它部分一模一样，并且解包用的依旧是 UNPACK_SEQUENCE 指令，所以两者的效果是相同的。当然啦，由于元组的构建比列表快一些，因此还是推荐第一种写法。 5）a = b = c = 123 背后的原理是什么？ 如果变量 a、b、c 指向的值相同，比如都是 123，那么便可以通过这种方式进行链式赋值。那么它背后是怎么做的呢？ 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 STORE_NAME 2 (c) 12 LOAD_CONST 1 (None) 14 RETURN_VALUE 出现了一个新的字节码指令 DUP_TOP，只要搞清楚它的作用，事情就简单了。 case TARGET(DUP_TOP): { // 获取栈顶元素，注意是获取、不是弹出 // TOP：查看元素，POP：弹出元素 PyObject *top = TOP(); // 增加指向对象的引用计数 Py_INCREF(top); // 压入栈中 PUSH(top); FAST_DISPATCH();\n} 所以 DUP_TOP 干的事情就是将栈顶元素拷贝一份，再重新压到栈里面。另外不管链式赋值语句中有多少个变量，模式都是一样的。 我们以 a = b = c = d = e = 123 为例： 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 DUP_TOP 12 STORE_NAME 2 (c) 14 DUP_TOP 16 STORE_NAME 3 (d) 18 STORE_NAME 4 (e) 20 LOAD_CONST 1 (None) 22 RETURN_VALUE 将常量压入运行时栈，然后拷贝一份，赋值给 a；再拷贝一份，赋值给 b；再拷贝一份，赋值给 c；再拷贝一份，赋值给 d；最后自身赋值给 e。 当然啦，虽然 Python 一切皆对象，但拿到的都是指向对象的指针，所以这里拷贝的是指针。 以上就是链式赋值的秘密，其实没有什么好神奇的，就是将栈顶元素进行拷贝，再依次赋值。但是这背后有一个坑，就是给变量赋的值不能是可变对象，否则容易造成 BUG。 a = b = c = {} a[\"ping\"] = \"pong\"\nprint(a) # {'ping': 'pong'}\nprint(b) # {'ping': 'pong'}\nprint(c) # {'ping': 'pong'} 虽然 Python 一切皆对象，但对象都是通过指针来间接操作的。所以 DUP_TOP 是将字典的地址拷贝一份，而字典只有一个，因此最终 a、b、c 会指向同一个字典。 6）a is b 和 a == b 的区别是什么？ is 用于判断两个变量是不是引用同一个对象，也就是保存的对象的地址是否相等；而 == 则是判断两个变量引用的对象是否相等，等价于 a.__eq__(b) 。 Python 的变量在 C 看来只是一个指针，因此两个变量是否指向同一个对象，等价于 C 中的两个指针存储的地址是否相等； 而 Python 的 ==，则需要调用 PyObject_RichCompare，来比较它们指向的对象所维护的值是否相等。 这两个语句的字节码指令是一样的，唯一的区别就是指令 COMPARE_OP 的参数不同。 // a is b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 8 (is) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE // a == b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 2 (==) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 我们看到指令参数一个是 8、一个是 2，然后是 COMPARE_OP 指令的背后逻辑： case TARGET(COMPARE_OP): { // 弹出栈顶元素，这里是 b PyObject *right = POP(); // 显然 left 就是 a，因为 b 被弹出之后，a 就成为了新的栈顶元素 PyObject *left = TOP(); // 进行比较，比较结果为 res PyObject *res = cmp_outcome(tstate, oparg, left, right); // 减少 left 和 right 引用计数 Py_DECREF(left); Py_DECREF(right); // 将栈顶元素替换为 res SET_TOP(res); if (res == NULL) goto error; // 指令预测，暂时不用管，等介绍 if 控制流的时候再说 PREDICT(POP_JUMP_IF_FALSE); PREDICT(POP_JUMP_IF_TRUE); DISPATCH();\n} 所以逻辑很简单，核心就在 cmp_outcome 函数中。 // Python/ceval.c\nstatic PyObject *\ncmp_outcome(PyThreadState *tstate, int op, PyObject *v, PyObject *w)\n{ int res = 0; // op 就是 COMPARE_OP 指令的参数 switch (op) { // PyCmp_IS 是一个枚举变量，等于 8，定义在 Include/opcode.h 中 // 而 is 关键字，在 C 的层面就是一个 == 判断 case PyCmp_IS: res = (v == w); break; // is not 则对应 != case PyCmp_IS_NOT: res = (v != w); break; // in 关键字 case PyCmp_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; break; // not in 关键字 case PyCmp_NOT_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; res = !res; break; // except 关键字 case PyCmp_EXC_MATCH: if (PyTuple_Check(w)) { Py_ssize_t i, length; length = PyTuple_Size(w); for (i = 0; i < length; i += 1) { PyObject *exc = PyTuple_GET_ITEM(w, i); if (!PyExceptionClass_Check(exc)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } } else { if (!PyExceptionClass_Check(w)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } res = PyErr_GivenExceptionMatches(v, w); break; default: // 剩下的走 PyObject_RichCompare 逻辑 // 这是一个函数调用，比较对象维护的值是否相等 return PyObject_RichCompare(v, w, op); } v = res ? Py_True : Py_False; Py_INCREF(v); return v;\n} 我们实际举个栗子： a = 3.14\nb = float(\"3.14\")\nprint(a is b) # False\nprint(a == b) # True a 和 b 都是 3.14，两者是相等的，但不是同一个对象。 反过来也是如此，如果 a is b 成立，那么 a == b 也不一定成立。可能有人好奇，a is b 成立说明 a 和 b 指向的是同一个对象，那么 a == b 表示该对象和自己进行比较，结果应该始终是相等的呀，为啥也不一定成立呢？以下面两种情况为例： class Girl: def __eq__(self, other): return False g = Girl()\nprint(g is g) # True\nprint(g == g) # False __eq__ 返回 False，此时虽然是同一个对象，但是两者不相等。 import math\nimport numpy as np a = float(\"nan\")\nb = math.nan\nc = np.nan\nprint(a is a, a == a) # True False\nprint(b is b, b == b) # True False\nprint(c is c, c == c) # True False nan 是一个特殊的浮点数，意思是 not a number（不是一个数字），用于表示空值。而 nan 和所有数字的比较结果均为 False，即使是和它自身比较。 但需要注意的是，在使用 == 进行比较的时候虽然是不相等的，但如果放到容器里面就不一定了。举个例子： import numpy as np lst = [np.nan, np.nan, np.nan]\nprint(lst[0] == np.nan) # False\nprint(lst[1] == np.nan) # False\nprint(lst[2] == np.nan) # False\n# lst 里面的三个元素和 np.nan 均不相等 # 但是 np.nan 位于列表中，并且数量是 3\nprint(np.nan in lst) # True\nprint(lst.count(np.nan)) # 3 出现以上结果的原因就在于，元素被放到了容器里，而容器的一些 API 在比较元素时会先判定它们存储的对象的地址是否相同，即：是否指向了同一个对象。如果是，直接认为相等；否则，再去比较对象维护的值是否相等。可以理解为先进行 is 判断，如果结果为 True，直接判定两者相等；如果 is 操作的结果不为 True，再去进行 == 判断。 因此 np.nan in lst 的结果为 True，lst.count(np.nan) 的结果是 3，因为它们会先比较对象的地址。地址相同，则直接认为对象相等。 在用 pandas 做数据处理的时候，nan 是一个非常容易坑的地方。 提到 is 和 ==，那么问题来了，在和 True、False、None 比较时，是用 is 还是用 == 呢？由于 True、False、None 它们不仅是关键字，而且也被看做是一个常量，最重要的是它们都是单例的，所以我们应该用 is 判断。 另外 is 在底层只需要一个 == 即可完成，但 Python 的 ==，在底层则需要调用 PyObject_RichCompare 函数。因此 is 在速度上也更有优势，== 操作肯定比函数调用要快。 补充：判断对象是否相等，底层有两个常用的函数，分别是 PyObject_RichCompare 和 PyObject_RichCompareBool。 PyObject_RichCompare 是直接比较对象的值是否相等。而 PyObject_RichCompareBool 会先比较地址是否相等（即是否是同一个对象），如果是同一个对象，那么直接认为相等，否则再调用 PyObject_RichCompare 判断值是否相等。 对于容器的一些 API，在比较对象是否相等时，调用的都是 PyObject_RichCompareBool。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 变量赋值的具体细节","id":"275","title":"变量赋值的具体细节"},"276":{"body":"以上我们就分析了常见的几个指令，以及变量赋值的底层逻辑，怎么样，是不是对 Python 有更深的理解了呢。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 小结","id":"276","title":"小结"},"277":{"body":"前面我们分析了虚拟机执行字节码的原理，并且也介绍了不少指令，但这些指令都是从上往下顺序执行的，不涉及任何的跳转。而像流程控制语句，比如 if、for、while、try 等等，它们在执行时会发生跳转，因此 Python 底层一定还存在相应的跳转指令。 那么从现在开始，就来分析一下这些流程控制语句的实现原理，本文先来介绍 if 语句。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 楔子","id":"277","title":"楔子"},"278":{"body":"if 语句应该是最简单也是最常用的流程控制语句，那么它的字节码是怎么样的呢？当然这里的 if 语句指的是 if elif else 整体，里面的某个条件叫做该 if 语句的分支。 我们看一下 if 语句的字节码长什么样子。 import dis code_string = \"\"\"\nscore = 90 if score >= 85: print(\"Good\") elif score >= 60: print(\"Normal\") else: print(\"Bad\")\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译得到的字节码指令比较多，我们来慢慢分析。另外为了阅读方便，源代码行号就不显示了。 // 加载常量 90 并压入运行时栈 0 LOAD_CONST 0 (90) // 加载符号表中索引为 0 的符号 \"score\"，弹出运行时栈的栈顶元素 90 // 然后将两者绑定起来，存放在当前的名字空间中 2 STORE_NAME 0 (score) // 加载变量 score 4 LOAD_NAME 0 (score) // 加载常量 85 6 LOAD_CONST 1 (85) // 进行比较，操作符是 >=，这个指令之前介绍过的 8 COMPARE_OP 5 (>=) // 如果比较结果为 False，就进行跳转，从名字也能看出指令的含义 // 那么跳转到什么地方呢？指令参数 22 表示跳转到偏移量为 22 的指令 // 很明显，就是当前分支的下一个分支。关于具体是怎么跳转的，一会儿说 10 POP_JUMP_IF_FALSE 22 // 如果走到这里说明没有跳转，当前分支的条件为真，那么开始执行该分支内部的逻辑 // 以下 4 条指令对应 print(\"Good\") 12 LOAD_NAME 1 (print) 14 LOAD_CONST 2 ('Good') 16 CALL_FUNCTION 1 18 POP_TOP // if 语句只有一个分支会被执行，如果执行了某个分支，那么整个 if 语句就结束了 // 于是向前跳转 26 个偏移量，来到偏移量为 48 的指令 20 JUMP_FORWARD 26 (to 48) // 对应 score >= 60\n>> 22 LOAD_NAME 0 (score) 24 LOAD_CONST 3 (60) 26 COMPARE_OP 5 (>=) // 如果比较结果为假，跳转到偏移量为 40 的指令 28 POP_JUMP_IF_FALSE 40 // 以下 4 条指令对应 print(\"Normal\") 30 LOAD_NAME 1 (print) 32 LOAD_CONST 4 ('Normal') 34 CALL_FUNCTION 1 36 POP_TOP // 向前跳转 8 个偏移量，来到偏移量为 48 的指令 38 JUMP_FORWARD 8 (to 48) // 最后一个是 else 分支，而 else 分支没有判断条件\n>> 40 LOAD_NAME 1 (print) 42 LOAD_CONST 5 ('Bad') 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明 if 语句结束了，而下面也没有代码了，于是返回 // 每个代码块对应的指令的最后都有一个 return\n>> 48 LOAD_CONST 6 (None) 50 RETURN_VALUE 我们看到字节码偏移量之前有几个 >> 这样的符号，显然这是 if 语句中的每一个分支开始的地方。 经过分析，整个 if 语句的字节码指令还是很简单的。就是从上到下依次判断每一个分支，如果某个分支条件成立，就执行该分支的代码，执行完毕后结束整个 if 语句；否则跳转到下一个分支。 显然核心就在于 POP_JUMP_IF_FALSE 指令，我们看一下它的逻辑。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » if 字节码","id":"278","title":"if 字节码"},"279":{"body":"COMPARE_OP 执行完之后会将比较的结果压入运行时栈，而 POP_JUMP_IF_FALSE 指令则是将结果从栈顶弹出并判断真假。如果为假，那么跳到下一个分支，否则执行此分支的代码。 case TARGET(POP_JUMP_IF_FALSE): { PREDICTED(POP_JUMP_IF_FALSE); // 从栈顶弹出比较结果 PyObject *cond = POP(); int err; // 如果 cond is True，说明当前分支的条件成立，那么执行下一条指令 if (cond == Py_True) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is False，那么通过 JUMPTO 跳转到 if 语句的下一个分支 // 关于 JUMPTO 一会儿介绍 if (cond == Py_False) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 到这里说明 cond 不是布尔值，那么调用 PyObject_IsTrue 并判断结果是否为真 // PyObject_IsTrue(cond)：等价于 Python 的 bool(cond) is True err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 cond 的布尔值为真，那么返回 1，此时什么也不做 // 最后会调用 DISPATCH()，去执行下一条指令 if (err > 0) ; // 如果 cond 的布尔值为假，那么返回 0，跳转到下一个 if 分支 else if (err == 0) JUMPTO(oparg); else goto error; DISPATCH();\n} 逻辑不难理解，但是里面出现了判断对象布尔值的函数，我们补充一下。 // Objects/object.c // 等价于 Python 的 bool(v) is True\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身就是布尔值 True，返回 1 if (v == Py_True) return 1; // 如果 v 本身就是布尔值 False，返回 0 if (v == Py_False) return 0; // 如果 v 是 None，返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且实现了 nb_bool（对应 __bool__） // 那么调用，如果结果不为 0，返回 1，否则返回 0 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且实现了 mp_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且实现了 sq_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 如果以上条件都不满足，直接返回 1，比如自定义类的实例对象（默认为真） else return 1; // 如果 res > 0 返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} // not 底层也调用了 PyObject_IsTrue\nint\nPyObject_Not(PyObject *v)\n{ int res; // 如果 v 是真，res == 1，那么 res == 0 结果是 0 // 如果 v 是假，res == 0，那么 res == 0 结果是 1 // 相当于取反 res = PyObject_IsTrue(v); if (res < 0) return res; return res == 0;\n} // Objects/boolobject.c\nstatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // <class 'bool'> 是一个 Python 类，这里的 bool_new 便是它的构造函数 PyObject *x = Py_False; long ok; // 不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 只接收 0 ~ 1 个参数，如果不传，那么默认返回 False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 PyObject_IsTrue，所以我们说 if v 和 if bool(v) 是等价的 // 因为当 v 不是布尔值时，if v 对应的指令内部会调用 PyObject_IsTrue // 而 bool(v) 也会调用 PyObject_IsTrue，所以两者是等价的 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 调用 PyBool_FromLong 创建布尔值，ok 为 1 返回 True，为 0 返回 False return PyBool_FromLong(ok);\n} PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 相信你现在明白了为什么 if 后面不跟布尔值也是可以的，因为有一个 C 函数 PyObject_IsTrue，可以判断任意对象的真假。如果 if 后面跟着的不是布尔值，那么会自动调用该函数。另外由于 bool(v) 也会调用该函数，所以 if v 和 if bool(v) 是等价的。 注：没有 PyObject_IsFalse。 说完了 POP_JUMP_IF_FALSE 指令，再补充一个和它相似的指令叫 POP_JUMP_IF_TRUE，它表示当比较结果为真时，跳到下一个分支，否则执行当前分支的代码。可能有人觉得，这不对吧，比较结果为真，难道不应该执行当前分支的逻辑吗？所以 POP_JUMP_IF_TRUE 指令似乎本身就是矛盾的。 仔细想想你应该能够猜到原因，答案就是使用了 not。 import dis code_string = \"\"\"\nif 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" code_string = \"\"\"\nif not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 正常情况下如果比较结果为 False，则跳转到 if 语句的下一个分支，所以 POP_JUMP_IF_FALSE 指令是合理的。至于 POP_JUMP_IF_TRUE 指令从逻辑上似乎就不该存在，因为它和 if 语句本身是相矛盾的。但现在我们明白了，该指令其实是为 not 关键字准备的。如果比较结果为真，那么 not 取反就是假，于是跳转到 if 语句的下一个分支，所以整个逻辑依旧是正确的。 当然这里只有一个 not，即使有很多个 not 也是可以的，尽管这没太大意义。 import dis # 这里有 4 个 not，因为是偶数个，两两相互抵消\n# 所以结果等价于 if 2 > 1\ncode_string = \"\"\"\nif not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" # 这里有 5 个 not，因为是奇数个，两两相互抵消之后还剩下一个\n# 所以结果等价于 if not 2 > 1\ncode_string = \"\"\"\nif not not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 然后再看一下 POP_JUMP_IF_TRUE 指令的内部逻辑，显然它和 POP_JUMP_IF_FALSE 是类似的。 case TARGET(POP_JUMP_IF_TRUE): { PREDICTED(POP_JUMP_IF_TRUE); // 弹出栈顶元素 PyObject *cond = POP(); int err; // 如果 cond is False，那么 not 之后就是 True // 所以当前 if 分支成立，于是执行下一条指令 if (cond == Py_False) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is True，那么 not 之后就是 False // 因此跳转到下一个分支 if (cond == Py_True) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 说明 cond 不是布尔值，那么通过 PyObject_IsTrue 判断是否为真 // 为真返回 1，为假返回 0，出现错误的话返回 -1（基本不会发生） err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 err > 0，说明布尔值为真，但还要进行 not 取反，因此最终整体为假 // 所以会跳转到下一个分支 if (err > 0) { JUMPTO(oparg); } // 如果 err == 0，说明布尔值为假，那么 not 取反之后整体为真 // 因此会执行当前分支内的逻辑，所以此处什么也不用做，直接 DISPATCH() 到下一条指令即可 else if (err == 0) ; else goto error; DISPATCH();\n} 以上就是 POP_JUMP_IF_FALSE 和 POP_JUMP_IF_TRUE 的内部逻辑，可以说非常简单。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » POP_JUMP_IF_FALSE","id":"279","title":"POP_JUMP_IF_FALSE"},"28":{"body":"然后来说一说 Python 的 C API，这个非常关键。首先 Python 解释器听起来很高大上，但按照陈儒老师的说法，它不过就是用 C 语言写出的一个开源软件，从形式上和其它软件并没有本质上的不同。 比如你在 Windows 系统中打开 Python 的安装目录，会发现里面有一个二进制文件 python.exe 和一个动态库文件 python38.dll。二进制文件负责执行，动态库文件则包含了相应的依赖，当然编译的时候也可以把动态库里的内容统一打包到二进制文件中，不过大部分软件在开发时都会选择前者。 既然解释器是用 C 写的，那么在执行时肯定会将 Python 代码翻译成 C 代码，这是毫无疑问的。比如创建一个列表，底层就会创建一个 PyListObject 实例，比如调用某个内置函数，底层会调用对应的 C 函数。 所以如果你想搞懂 Python 代码的执行逻辑或者编写 Python 扩展，那么就必须要清楚解释器提供的 API 函数。而按照通用性来划分的话，这些 API 可以分为两种。 泛型 API； 特定类型 API； 泛型 API 顾名思义，泛型 API 和参数类型无关，属于抽象对象层。这类 API 的第一个参数是 PyObject *，可以处理任意类型的对象，API 内部会根据对象的类型进行区别处理。 而且泛型 API 的名称也是有规律的，格式为 PyObject_###，我们举例说明。 所以泛型 API 一般以 PyObject_ 开头，第一个参数是 PyObject *，表示可以处理任意类型的对象。 特定类型 API 顾名思义，特定类型 API 和对象的类型是相关的，属于具体对象层，只能作用在指定类型的对象上面。因此不难发现，每种类型的对象，都有属于自己的一组特定类型 API。 // 通过 C 的 double 创建 PyFloatObject\nPyObject* PyFloat_FromDouble(double v); // 通过 C 的 long 创建 PyLongObject\nPyObject* PyLong_FromLong(long v);\n// 通过 C 的 char * 创建 PyLongObject\nPyObject* PyLong_FromString(const char *str, char **pend, int base) 以上就是解释器提供的两种 C API，了解完之后我们再来看看对象是如何创建的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 的 C API","id":"28","title":"Python 的 C API"},"280":{"body":"指令跳转是由 JUMPTO 实现的，它内部的逻辑长啥样呢？并且跳转除了 JUMPTO 之外，还有一个 JUMPBY，这两者有啥区别呢？ // Python/ceval.c #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 字节码指令的遍历是通过 next_instr 实现的，如果将指令执行的方向代表前进的方向。 JUMPTO(x)：表示从头开始向前跳转 x 个偏移量。 JUMPBY(x)：表示从当前指令所在的位置向前跳转 x 个偏移量。 所以 JUMPTO 表示绝对跳转，JUMPBY 表示相对跳转。不难发现，JUMPTO 既可以向前跳转（偏移量增大），也可以向后跳转（偏移量减小）；而 JUMPBY 只能向前跳转。 假设参数为 n，当前指令的偏移量为 m。对于 JUMPTO 而言，跳转之后的偏移量始终为 2n，如果 m < 2n 就是向前跳转，m > 2n 就是向后跳转。但对于 JUMPBY 而言，由于它是从当前待执行的指令开始跳转的，所以只能向前跳转（偏移量增大）。 另外在看字节码指令的时候，我们还看到了一个 JUMP_FORWARD 指令，当某个分支执行完毕之后，会直接跳转到 if 语句结束的下一条指令。并且不同分支对应的 JUMP_FORWARD 指令的参数是不同的，所以它内部一定使用了相对跳转。 case TARGET(JUMP_FORWARD): { JUMPBY(oparg); FAST_DISPATCH();\n} 我们分析的没错，它内部就是调用了一个 JUMPBY，因为终点相同、但跳转的偏移量不同，所以只能是相对跳转。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » JUMPTO","id":"280","title":"JUMPTO"},"281":{"body":"通过引入计算跳转，可以避免不必要的匹配。因为整个指令集合是已知的，这就说明某条指令在执行时，便可知道它的下一条指令是什么。所以当前指令处理完后，可以直接跳转到下一条指令对应的处理逻辑中，这就是计算跳转。但如果不使用计算跳转，那么每次读取到指令后，都要进入 switch，顺序匹配一百多个 case 分支，找到匹配成功的那一个。 因此使用计算跳转可以避免不必要的匹配，既然提前知道下一条指令是啥了，那么直接精确跳转就行，无需多走一遍 switch。不过要想实现计算跳转，需要 GCC 支持标签作为值，即 goto *label_addr 用法，由于 label_addr 是一个标签地址，那么解引用之后就是标签了。至于具体会跳转到哪一个标签，取决于 label_addr 保存了哪一个标签的地址，因此这种跳转是动态的，在运行时决定跳转目标。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 虚拟机为每个指令的处理逻辑都定义了一个标签，对于计算跳转来说，goto 的结果是 *标签地址，这个地址是运行时计算得出的。我们举个例子，随便看一段字节码指令集。 比如当前正在执行 LOAD_FAST 指令，那么下一条指令可以是 STORE_FAST、LOAD_FAST 以及 BUILD_LIST 等。当开启计算跳转时： 如果下一条指令是 STORE_FAST，那么之后就会跳转到 STORE_FAST 对应的标签； 如果下一条指令是 LOAD_FAST，那么之后就会跳转到 LOAD_FAST 对应的标签； 如果下一条指令是 BUILD_LIST，那么之后就会跳转到 BUILD_LIST 对应的标签； 所以在运行时判断指令的值，获取对应的标签，从而实现精确跳转，这就是计算跳转。当然这些内容在剖析虚拟机执行字节码时已经说过了，这里再回顾一下。 接下来说一说指令预测，不难发现，如果是计算跳转，那么指令预测功能貌似没啥用，因为总是能精确跳转到下一条指令对应的标签中。没错，指令预测只有在不使用计算跳转的情况下有用，那什么是指令预测呢？ 在不使用计算跳转时，goto 后面必须是一个静态的标签，跳转位置在编译阶段便已经固定，换句话说一个指令执行完毕后要跳转到哪一个标签是写死的，不能保证跳转后的标签正好对应下一条指令的处理逻辑。比如 LOAD_FAST 的下一条指令可以是 STORE_FAST 和 BUILD_LIST，那么应该跳转到哪一个指令对应的标签中呢？ 正因为这种不确定性，绝大部分指令在执行完毕后都会直接跳转到 fast_next_opcode 标签，然后顺序匹配 case 分支。 但也有那么几个指令，由于彼此的关联性很强，很多时候都是成对出现的，面对这样的指令，虚拟机会进行预测。比如 A 和 B 两个指令的关联性很强，尽管 A 的下一条指令除了是 B 之外，也有可能是其它指令，但 B 出现的概率是最大的，因此虚拟机会预测下一条指令是 B 指令。于是在执行完 A 指令之后，会验证自己的预测是否正确，即检测下一条指令是否是 B 指令。如果预测对了，可以实现精确跳转，如果预测错了，就只能回到 switch 语句逐一匹配 case 分支了。 总结一下：指令在执行时，它的下一条指令是已知的，但是不固定，有多种可能。如果不使用计算跳转，由于 goto 后面必须是一个写死的标签，而下一条指令却不固定，那么只能选择进入 switch、顺序匹配 case 分支。但也有那么几对指令，关联性很强，虽然不能保证百分百，但值得做一次尝试，这便是指令预测。 当然啦，如果使用计算跳转，情况则不一样了，此时压根用不到指令预测。因为 goto 后面是 *标签地址，而地址是可以动态获取的。由于所有标签的地址都保存在了一个数组中，不管接下来要处理哪一条指令，都可以获取到对应的标签地址，实现精确跳转。 好，关于指令预测我们已经知道是啥了，那么在源码层面又是如何体现的呢？在 POP_JUMP_IF_FALSE 指令中，我们看到有这么一行逻辑。 里面有一个宏 PREDICTED。 // Python/ceval.c\n#define PREDICTED(op) PRED_##op: 这个宏展开之后又是一个标签，由于调用时结尾加了分号，所以这还是一个空标签。整体效果如下： 那么展开成一个标签有什么用呢？首先肯定是为了跳转，至于具体过程我们再看一下 COMPARE_OP 指令就明白了。 COMPARE_OP 指令上面已经介绍了，它会对两个对象进行比较，并将比较结果压入运行时栈。之后它做了指令预测，并且还预测了两次，因为虚拟机认为 COMPARE_OP 执行完之后大概率会执行 POP_JUMP_IF_FALSE 或 POP_JUMP_IF_TRUE，所以做了一个预测。而相关逻辑位于 PREDICT 中，看一下它长什么样子。 // Python/ceval.c // 如果开启计算跳转，那么指令预测不生效，因为本身就知道该跳转到哪个指令对应的标签\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n// 如果不开启计算跳转，那么会比较预测的指令和实际的指令是否相等\n// 所以 COMPARE_OP 指令处理逻辑里面的 PREDICT(POP_JUMP_IF_FALSE)\n// 就是在判断下一条指令是不是自己预测的 POP_JUMP_IF_FALSE\n// 如果是，说明预测成功，那么 goto PRED_POP_JUMP_IF_FALSE\n// 否则说明预测失败，那么会执行 DISPATCH()，然后 goto 到 switch 语句所在位置\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif 以上便是指令预测，说白了就是如果指令 A 和指令 B 具有极高的关联性（甚至百分百），那么执行完 A 指令后会判断下一条指令是不是 B。如果是，那么直接跳转即可，就省去了匹配 case 分支的时间，如果不是，那就只能挨个匹配了。 因为是静态跳转，goto 后面的标签是写死的，编译阶段就确定了，所以只有那种关联度极高的指令才会开启预测功能，因为预测成功的概率比较高。但如果指令 A 的下一条指令有多种可能（假设有 6 种），并且每种指令出现的概率还差不多，那么这时不管预测哪一个，成功的概率都只有 1/6。显然这就不叫预测了，这是在掷骰子，因此对于这样的指令，虚拟机不会为它开启预测功能。 比如 LOAD_FAST 的下一个指令可以是 STORE_FAST、LOAD_FAST、BUILD_LIST 等等，不管预测哪一种，成功的概率都不是特别高，因此它没有进行指令预测。 所以就一句话：只有 A 和 B 两个指令的关联度极高的时候，执行 A 之后才会预测下一条指令是否是 B。预测成功直接跳转，预测失败执行 DISPATCH()，跳转到 fast_next_opcode 标签，进入 switch 语句。 但如果使用了计算跳转，情况就不一样了，此时不会开启指令预测，或者说指令预测里的逻辑会变得无效。 很明显，使用计算跳转后，PREDICT(op) 不会产生任何效果，因此也可以理解为没有开启指令预测。而之所以不用预测，是因为执行 DISPATCH() 的时候，本身就可以精确跳转到指定位置。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 指令预测","id":"281","title":"指令预测"},"282":{"body":"本篇文章我们就分析了 if 语句的实现原理，总的来说不难理解。依旧是在栈桢中执行字节码，只是多了一个指令跳转罢了，至于怎么跳转、跳转到什么地方，全部都体现在字节码中。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 小结","id":"282","title":"小结"},"283":{"body":"在介绍 if 语句的时候，我们看到了最基本的控制流，其核心就是跳转。但是 if 只能向前跳转，而接下来介绍的 for、while 循环，指令是可以回退的，也就是向后跳转。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 楔子","id":"283","title":"楔子"},"284":{"body":"我们看一个简单的 for 循环的字节码。 import dis code_string = \"\"\"\nlst = [1, 2]\nfor item in lst: print(item)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译之后，字节码指令如下。 // 加载常量 1，压入运行时栈 0 LOAD_CONST 0 (1) // 加载常量 2，压入运行时栈 2 LOAD_CONST 1 (2) // 将运行时栈的元素弹出，构建长度为 2 的列表，并压入栈中 4 BUILD_LIST 2 // 将上一步构建的列表从栈顶弹出，并用符号 lst 与之绑定 // 到此 lst = [1, 2] 便完成了 6 STORE_NAME 0 (lst) // 从全局名字空间中加载 lst 8 LOAD_NAME 0 (lst) // 获取对应的迭代器，即 iter(lst) 10 GET_ITER // 开始 for 循环，将里面的元素依次迭代出来 // 如果迭代结束，向前跳转 12 个偏移量，来到偏移量为 26 的指令\n>> 12 FOR_ITER 12 (to 26) // 到这里说明上一步迭代出元素了 // 用符号 item 和迭代出的元素进行绑定 14 STORE_NAME 1 (item) // 对应 print(item) 16 LOAD_NAME 2 (print) 18 LOAD_NAME 1 (item) 20 CALL_FUNCTION 1 22 POP_TOP // 到此，一次遍历就完成了，那么跳转到偏移量为 12 的指令，进行下一轮循环 // 注意：上面的 FOR_ITER 指令和这里的 JUMP_ABSOLUTE 指令的参数都是 12 // 但它们有着不同，FOR_ITER 指令的参数 12 表示从当前位置向前跳转 12 个偏移量 // 而 JUMP_ABSOLUTE 指令的参数 12 表示跳转到偏移量为 12 个位置（或者说从开头跳转 12 个偏移量） 24 JUMP_ABSOLUTE 12\n>> 26 LOAD_CONST 2 (None) 28 RETURN_VALUE 我们直接从 10 GET_ITER 开始看起，首先 for 循环遍历的对象必须是可迭代对象，然后会调用它的 __iter__ 方法，得到迭代器。再不断地调用迭代器的 __next__ 方法，一步一步将里面的值全部迭代出来，当出现 StopIteration 异常时，for 循环捕捉，最后退出。 另外，我们说 Python 里面是先有值，后有变量，for 循环也不例外。循环的时候，先将迭代器中的元素迭代出来，然后再让变量 item 指向。因此包含 10 个元素的迭代器，需要迭代 11 次才能结束。因为 for 循环事先是不知道迭代 10 次就能结束的，它需要再迭代一次，发现没有元素可以迭代、并捕获抛出的 StopIteration 之后，才能结束。 for 循环遍历可迭代对象时，会先拿到对应的迭代器，那如果遍历的就是一个迭代器呢？答案是依旧调用 __iter__，只不过由于本身就是一个迭代器，所以返回的还是其本身。 将元素迭代出来之后，就开始执行 for 循环体的逻辑了。 执行完一轮循环之后，通过 JUMP_ABSOLUTE 跳转到字节码偏移量为 12、也就是 FOR_ITER 的位置开始下一次循环。这里我们发现它没有跳到 GET_ITER 那里，所以可以得出结论，for 循环在遍历的时候只会创建一次迭代器。 下面来看指令对应的具体逻辑： case TARGET(GET_ITER): { // 获取栈顶元素，即上一步压入的列表指针 PyObject *iterable = TOP(); // 调用 PyObject_GetIter，获取对应的迭代器 // 这个函数在介绍迭代器的时候已经说过了 // 等价于 iter = type(iterable).__iter__(iterable) PyObject *iter = PyObject_GetIter(iterable); Py_DECREF(iterable); // 将迭代器 iter 设置为栈顶元素 SET_TOP(iter); if (iter == NULL) goto error; // 指令预测，解释器认为下一条指令大概率是 FOR_ITER 或 CALL_FUNCTION PREDICT(FOR_ITER); PREDICT(CALL_FUNCTION); DISPATCH();\n} 当创建完迭代器之后，就正式进入 for 循环了。所以从 FOR_ITER 开始，进入了虚拟机层面上的 for 循环。 源代码中的 for 循环，在虚拟机层面也一定对应着一个相应的循环控制结构。因为无论进行怎样的变换，都不可能在虚拟机层面利用顺序结构来实现源码层面上的循环结构，这也可以看作是程序的拓扑不变性。 因此源代码是宏观的，虚拟机执行字节码是微观的，尽管两者的层级不同，但本质上等价的，是程序从一种形式到另一种形式的等价转换。 我们来看一下 FOR_ITER 指令对应的具体实现： case TARGET(FOR_ITER): { PREDICTED(FOR_ITER); // 从栈顶获取迭代器对象（指针） PyObject *iter = TOP(); // 调用迭代器类型对象的 tp_iternext，将迭代器内的元素迭代出来 PyObject *next = (*iter->ob_type->tp_iternext)(iter); // 如果 next != NULL，说明迭代到元素了，那么压入运行时栈 if (next != NULL) { PUSH(next); PREDICT(STORE_FAST); PREDICT(UNPACK_SEQUENCE); DISPATCH(); } // 否则说明迭代出现异常 if (_PyErr_Occurred(tstate)) { // 如果异常还不是 StopIteration，那么跳转到 error 标签 if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) { goto error; } else if (tstate->c_tracefunc != NULL) { call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); } // 否则说明是 StopIteration，那么证明迭代完毕，将异常清空 _PyErr_Clear(tstate); } // 迭代结束了，但运行时栈里面还有一个迭代器对象 // 那么要将它弹出，因此这里执行了 STACK_SHRINK(1) STACK_SHRINK(1); Py_DECREF(iter); // 跳转到 for 循环结束后的下一条指令 // 当前的指令为：12 FOR_ITER 12 (to 26) // 所以会通过 JUMPBY 实现一个相对跳转 // 从当前位置向前跳转 12 个偏移量，来到偏移量为 26 的指令 JUMPBY(oparg); PREDICT(POP_BLOCK); DISPATCH();\n} 在执行 FOR_ITER 的时候，如果迭代器没有耗尽，那么会迭代出元素，压入运行时栈，然后调用 DISPATCH() 去执行下一条指令。当一轮循环结束后，还要进行指令回退，从字节码中也看到了，for 循环遍历一次之后，会再次跳转到 FOR_ITER，而跳转所使用的指令就是 JUMP_ABSOLUTE，从名字也能看出这个指令会使用绝对跳转。 case TARGET(JUMP_ABSOLUTE): { PREDICTED(JUMP_ABSOLUTE); // 跳转到偏移量为 oparg 的指令 JUMPTO(oparg);\n#if FAST_LOOPS FAST_DISPATCH();\n#else DISPATCH();\n#endif\n} 之前介绍过 JUMPTO 和 JUMPBY 两个宏， #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个宏都表示跳转 x 个偏移量，但 JUMPTO 是从头开始跳转，所以只要 x 固定，那么跳转位置就始终是固定的。而 JUMPBY 表示从当前位置开始跳转，所以位置不同，跳转的结果也不同。 然后天下没有不散的宴席，随着迭代的进行，for 循环总有退出的那一刻，而这个退出的动作只能落在 FOR_ITER 的身上。在 FOR_ITER 指令执行的过程中，如果遇到了 StopIteration，就意味着迭代结束了。这个结果将导致虚拟机会将迭代器从运行时栈中弹出，同时执行一个 JUMPBY 动作，向前跳跃，在字节码的层面是向下，也就是偏移量增大的方向。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » for 控制流","id":"284","title":"for 控制流"},"285":{"body":"看完了 for，再来看看 while，并且我们还要分析两个关键字：break、continue。 import dis code_string = \"\"\"\na = 0\nwhile a < 10: a += 1 if a == 5: continue if a == 7: break print(a)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 看一下它的指令： // a = 0 0 LOAD_CONST 0 (0) 2 STORE_NAME 0 (a) // 比较 a < 10\n>> 4 LOAD_NAME 0 (a) 6 LOAD_CONST 1 (10) 8 COMPARE_OP 0 (<) // 如果 a < 10 为假，说明循环结束 // 跳转到偏移量为 50 的指令，内部会使用绝对跳转 10 POP_JUMP_IF_FALSE 50 // 到这里说明 while 条件成立，进入循环体 // 执行 a += 1 12 LOAD_NAME 0 (a) 14 LOAD_CONST 2 (1) 16 INPLACE_ADD 18 STORE_NAME 0 (a) // 比较 a == 5 20 LOAD_NAME 0 (a) 22 LOAD_CONST 3 (5) 24 COMPARE_OP 2 (==) // 如果 a == 5 为假，跳转到偏移量为 30 的指令 26 POP_JUMP_IF_FALSE 30 // 否则说明 a == 5 为真，执行 continue // 由于 continue 是立即进入下一轮循环 // 所以直接跳转到偏移量为 4 的指令，即 while 循环的开始位置 // 所以在虚拟机的层面，continue 就是一个跳转指令 28 JUMP_ABSOLUTE 4 // 比较 a == 7\n>> 30 LOAD_NAME 0 (a) 32 LOAD_CONST 4 (7) 34 COMPARE_OP 2 (==) // 如果 a == 7 为假，跳转到偏移量为 40 的指令 36 POP_JUMP_IF_FALSE 40 // 否则说明 a == 7 为真，执行 break // 因此直接跳转到偏移量为 50 的位置，即 while 循环结束后的下一条指令 38 JUMP_ABSOLUTE 50 // print(a)\n>> 40 LOAD_NAME 1 (print) 42 LOAD_NAME 0 (a) 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明一轮循环结束了，那么跳转到偏移量为 4 的位置，即 while 循环的开始位置 48 JUMP_ABSOLUTE 4 // 隐式的 return None\n>> 50 LOAD_CONST 5 (None) 52 RETURN_VALUE 有了 for 循环，再看 while 循环就简单多了，整体逻辑和 for 高度相似，当然里面还结合了 if。 刚才说了，尽管源代码和字节码的层级不同，但本质上是等价的，是程序从一种形式到另一种形式的等价转换。在源码中能看到的，在字节码当中也能看到。比如源代码中的 continue 会跳转到循环所在位置，那么在字节码中自然也会对应一个跳转指令。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » while 控制流","id":"285","title":"while 控制流"},"286":{"body":"以上我们就探讨了 Python 的两种循环，总的来说没什么难度，本质上还是跳转。只不过有时会通过 JUMPTO 进行绝对跳转，有时会通过 JUMPBY 进行相对跳转。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 小结","id":"286","title":"小结"},"287":{"body":"程序在运行的过程中，总是会不可避免地产生异常，此时为了让程序不中断，必须要将异常捕获掉。如果能提前得知可能会发生哪些异常，建议使用精确捕获，如果不知道会发生哪些异常，则使用 Exception 兜底。 另外异常也可以用来传递信息，比如生成器。 def gen(): yield 1 yield 2 return \"result\" g = gen()\nnext(g)\nnext(g)\ntry: next(g)\nexcept StopIteration as e: print(f\"返回值: {e.value}\") # 返回值: result 如果想要拿到生成器的返回值，我们需要让它抛出 StopIteration，然后进行捕获，再通过 value 属性拿到返回值。所以，Python 是将生成器的返回值封装到了异常里面。 之所以举这个例子，目的是想说明，异常并非是让人嗤之以鼻的东西，它也可以作为信息传递的载体。特别是在 Java 语言中，引入了 checked exception，方法的所有者还可以声明自己会抛出什么异常，然后调用者对异常进行处理。在 Java 程序启动时，抛出大量异常都是司空见惯的事情，并在相应的调用堆栈中将信息完整地记录下来。至此，Java 的异常不再是异常，而是一种很普遍的结构，从良性到灾难性都有所使用，异常的严重性由调用者来决定。 虽然在 Python 里面，异常还没有达到像 Java 异常那么高的地位，但使用频率也是很高的，下面我们就来剖析一下异常是怎么实现的？","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 楔子","id":"287","title":"楔子"},"288":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机，所以异常可以由编译器抛出，也可以由虚拟机剖出。如果是编译器抛出的异常，那么基本上都是 SyntaxError，即语法错误。 try: >>>\nexcept Exception as e: print(e) 比如上面这段代码，你会发现异常捕获根本没用，因为这是编译阶段就发生的错误，而异常捕获是在运行时进行的。当然语法不对属于低级错误，所以不会留到运行时。 然后是运行时产生的异常： try: 1 / 0\nexcept ZeroDivisionError: print(\"Division by zero\") 像这种语法正确，但程序执行时因逻辑出现问题而导致的异常，是可以被捕获的。对于我们来说，关注的显然是运行时产生的异常，比如 TypeError、IndexError 等等。 那么问题来了，异常本质上是什么呢？我们以列表为例，看看 IndexError 是怎么产生的。 lst = [1, 2, 3]\nprint(lst[3])\n\"\"\"\nIndexError: list index out of range\n\"\"\" 列表的最大索引是 2，但我们访问了索引为 3 的元素，虚拟机就知道不能再执行下去了，否则会访问非法内存。因此虚拟机的做法是：输出异常信息，结束进程。我们通过源码来验证一下： 在获取列表元素时发现索引不合法，就知道要抛出 IndexError 了，于是将异常写入到回溯栈中，并返回 NULL。正常情况下，返回值应该指向一个合法的对象，如果为 NULL，证明出现异常了。 此时虚拟机会将回溯栈里的异常抛出来（就是我们在控制台看到的那一抹鲜红），然后结束进程，这就是异常的本质。当然异常也是一个 Python 对象，虚拟机在退出前，会写入到 stderr 中。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常的本质是什么？","id":"288","title":"异常的本质是什么？"},"289":{"body":"当我们用 C 编写 Python 扩展时，如果想设置异常的话，该怎么做呢？首先设置异常之前，我们要知道有哪些异常。在 pyerrors.h 中，虚拟机内置了大量的异常，另外 Python 一切皆对象，因此异常也是一个对象。 有了异常之后，怎么写入呢？关于异常写入，底层也提供了相应的 C API。 PyErr_SetNone：设置异常，不包含提示信息。 PyErr_SetObject：设置异常，包含提示信息（Python 字符串）。 PyErr_SetString：设置异常，包含提示信息（C 字符串）。 PyErr_Occurred：检测回溯栈中是否有异常产生。 PyErr_Clear：将回溯栈中的异常清空，相当于 Python 的异常捕获。 PyErr_Fetch：将回溯栈中的异常清空，同时拿到它的 exc_type、exc_value、exc_tb。 PyErr_Restore：基于 exc_type、exc_value、exc_tb 设置异常。 我们以 PyErr_Restore 为例，看看异常的具体设置过程。 // Python/errors.c // PyErr_SetObject、PyErr_SetString 等等，最终都会调用 PyErr_Restore\nvoid\nPyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); _PyErr_Restore(tstate, type, value, traceback);\n} // 将异常设置在线程状态对象中\nvoid\n_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *traceback)\n{ PyObject *oldtype, *oldvalue, *oldtraceback; if (traceback != NULL && !PyTraceBack_Check(traceback)) { Py_DECREF(traceback); traceback = NULL; } // 获取线程状态对象中已存在的异常（可能为空） oldtype = tstate->curexc_type; oldvalue = tstate->curexc_value; oldtraceback = tstate->curexc_traceback; // 将新异常设置在线程状态对象中 tstate->curexc_type = type; tstate->curexc_value = value; tstate->curexc_traceback = traceback; // 减少旧异常的引用计数 Py_XDECREF(oldtype); Py_XDECREF(oldvalue); Py_XDECREF(oldtraceback);\n} 注意这里的 PyThreadState 对象，它是与线程相关的，但它只是线程信息的一个抽象描述，而真实的线程及状态肯定是由操作系统来维护和管理的。 但虚拟机在运行的时候总需要另外一些与线程相关的状态和信息，比如是否发生了异常等等，而这些信息显然操作系统是没办法提供的。而 PyThreadState 对象正是 Python 为线程准备的、在虚拟机层面保存线程状态信息的对象（后面简称线程状态对象、或者线程对象）。 当前活动线程（OS 原生线程）对应的 PyThreadState 对象可以通过 PyThreadState_GET 获得，在得到了线程状态对象之后，就将异常信息存放在里面。 关于线程相关的内容，后续会详细说。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常写入的一些 C API","id":"289","title":"异常写入的一些 C API"},"29":{"body":"创建对象可以使用泛型 API，也可以使用特定类型 API，比如创建一个浮点数。 使用泛型 API 创建 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type); 通过泛型 API 可以创建任意类型的对象，因为该类 API 和类型无关。那么问题来了，解释器怎么知道要给对象分配多大的内存呢？ 在介绍类型对象的时候我们提到，对象的内存大小、支持哪些操作等等，都属于元信息，而元信息会存在对应的类型对象中。其中 tp_basicsize 和 tp_itemsize 负责指定实例对象所需的内存空间。 // Include/objimpl.h // 创建定长对象\n#define PyObject_New(type, typeobj) \\ ( (type *) _PyObject_New(typeobj) )\n// 创建变长对象\n#define PyObject_NewVar(type, typeobj, n) \\ ( (type *) _PyObject_NewVar((typeobj), (n)) )\n/* 所以 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type) 等价于如下 * PyObject* pi = (PyObject *)_PyObject_New(&PyFloat_Type) */ 所以实际申请内存的动作由 _PyObject_New 和 _PyObject_NewVar 负责，看看它的逻辑。 // Objects/object.c\nPyObject *\n_PyObject_New(PyTypeObject *tp)\n{ PyObject *op; // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_SIZE(tp) op = (PyObject *) PyObject_MALLOC(_PyObject_SIZE(tp)); if (op == NULL) return PyErr_NoMemory(); // 设置对象的类型和引用计数 return PyObject_INIT(op, tp);\n} PyVarObject *\n_PyObject_NewVar(PyTypeObject *tp, Py_ssize_t nitems)\n{ PyVarObject *op; const size_t size = _PyObject_VAR_SIZE(tp, nitems); // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_VAR_SIZE(tp, nitems) op = (PyVarObject *) PyObject_MALLOC(size); if (op == NULL) return (PyVarObject *)PyErr_NoMemory(); // 设置对象的类型、引用计数和 ob_size return PyObject_INIT_VAR(op, tp, nitems);\n} // Include/objimpl.h\n#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) #define _PyObject_VAR_SIZE(typeobj, nitems) \\ _Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \\ (nitems)*(typeobj)->tp_itemsize, \\ SIZEOF_VOID_P)\n/* 类型对象的 tp_basicsize 字段表示它的实例对象的基础大小，即底层结构体的大小 * 对于像浮点数这种不可变的定长对象来说，显然大小就等于 PyFloat_Type 的 tp_basicsize * * 如果对象内部可以容纳指定数量的元素，比如元组，那么 tp_itemsize 便是每个元素的大小 * 对于元组来说，它的大小等于 tp_basicsize + 元素个数 * tp_itemsize，并且按照 8 字节对齐 */ 以上便是泛型 API 创建对象的流程，但泛型 API 属于通用逻辑，而内置类型的实例对象一般会采用特定类型 API 创建。 使用特定类型 API 创建 // 创建浮点数，值为 2.71\nPyObject* e = PyFloat_FromDouble(2.71);\n// 创建一个可以容纳 5 个元素的元组\nPyObject* tpl = PyTuple_New(5);\n// 创建一个可以容纳 5 个元素的列表\n// 当然这是初始容量，列表还可以扩容\nPyObject* lst = PyList_New(5); 和泛型 API 不同，使用特定类型 API 只能创建指定类型的对象，因为这种 API 是和类型绑定的。比如我们可以用 PyDict_New 创建一个字典，但不可能创建一个集合出来。 如果使用特定类型 API，那么可以直接分配内存。因为内置类型的实例对象，它们的定义在底层都是写死的，解释器对它们了如指掌，因此可以直接分配内存并初始化。 比如通过 e = 2.71 创建一个浮点数，解释器看到 2.71 就知道要创建 PyFloatObject 结构体实例，那么申请多大内存呢？显然是 sizeof(PyFloatObject)，直接计算一下结构体实例的大小即可。 // Include/floatobject.h\ntypedef struct { // ob_refcnt 占 8 字节，ob_type 也占 8 字节 PyObject_HEAD // 占 8 字节 double ob_fval;\n} PyFloatObject; 由于 PyFloatObject 只是在 PyObject 的基础上引入了一个 double 字段，用于维护浮点数的值，所以一个 PyFloatObject 实例的大小为 24 字节。既然内存大小知道，那么直接分配就可以了，分配之后再将 ob_refcnt 初始化为 1、将 ob_type 设置为 &PyFloat_Type、将 ob_fval 设置为 2.71 即可。 同理可变对象也是一样，因为字段都是固定的，容纳的元素个数也可以根据赋的值得到，所以内部的所有字段占用了多少内存可以算出来，因此也是可以直接分配内存的。 还是那句话，解释器对内置的数据结构了如指掌，因为这些结构在底层都是定义好的，源码直接写死了。所以解释器根本不需要借助类型对象去创建实例对象，它只需要在实例对象创建完毕之后，再将 ob_type 设置为指定的类型即可（让实例对象和类型对象建立联系）。 所以采用特定类型 API 创建实例的速度会更快，但这只适用于内置的数据结构，而我们自定义类的实例对象显然没有这个待遇。假设通过 class Person: 定义了一个类，那么在实例化的时候，显然不可能通过 PyPerson_New 去创建，因为底层压根就没有这个 API。这种情况下创建 Person 的实例对象就需要 Person 这个类型对象了，因此自定义类的实例对象如何分配内存、如何进行初始化，需要借助对应的类型对象。 总的来说，Python 内部创建一个对象有两种方式： 通过特定类型 API，适用于内置数据结构，即内置类型的实例对象。 通过调用类型对象去创建（底层会调用泛型 API），多用于自定义类型。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 对象是如何创建的","id":"29","title":"对象是如何创建的"},"290":{"body":"帧评估函数里面有一个巨型的 switch，负责执行字节码指令，如果执行出错，那么跳转到 error 标签。 如果在执行指令的时候出现了异常，那么会跳转到 error 这里，否则会跳转到其它地方。另外当出现异常时，会在线程状态对象中将异常信息记录下来，包括异常类型、异常值、回溯栈（traceback），这个 traceback 就是在 error 标签中调用 PyTraceBack_Here 创建的。 另外可能有人不清楚 traceback 是做什么的，我们举个 Python 的例子。 def h(): 1 / 0 def g(): h() def f(): g() f()\n\"\"\"\nTraceback (most recent call last): File \"/Users/.../main.py\", line 10, in <module> f() File \"/Users/.../main.py\", line 8, in f g() File \"/Users/.../main.py\", line 5, in g h() File \"/Users/.../main.py\", line 2, in h 1 / 0\nZeroDivisionError: division by zero\n\"\"\" 这是脚本运行时产生的错误输出，我们看到了函数调用的信息：比如在源代码的哪一行调用了哪一个函数，那么这些信息是从何而来的呢？没错，显然是 traceback 对象。虚拟机在处理异常的时候，会创建 traceback 对象，在该对象中记录栈帧的信息。虚拟机利用该对象来将栈帧链表中每一个栈帧的状态进行可视化，可视化的结果就是上面输出的异常信息。 而且我们发现输出的信息也是一个链状的结构，因为每一个栈帧都会对应一个 traceback 对象，这些 traceback 对象之间也会组成一个链表。 所以当虚拟机开始处理异常的时候，它首先的动作就是创建 traceback 对象，用于记录异常发生时活动栈帧的状态。创建方式是通过 PyTraceBack_Here 函数，它接收一个栈帧作为参数。 // Python/traceback.c\nint\nPyTraceBack_Here(PyFrameObject *frame)\n{ // 获取当前的异常对象，拿到它的 exc_type、exc_val、exc_tb PyObject *exc, *val, *tb, *newtb; PyErr_Fetch(&exc, &val, &tb); // 创建新的 traceback 对象，并和旧的 traceback 对象组成链表 newtb = _PyTraceBack_FromFrame(tb, frame); if (newtb == NULL) { _PyErr_ChainExceptions(exc, val, tb); return -1; } // 将异常设置在线程状态对象中 // 并且异常的 exc_type 和 exc_val 保持不变，但 traceback 是新的 traceback PyErr_Restore(exc, val, newtb); Py_XDECREF(tb); return 0;\n} 那么这个 traceback 对象究竟长什么样呢？ // Include/cpython/traceback.h\ntypedef struct _traceback { PyObject_HEAD struct _traceback *tb_next; struct _frame *tb_frame; int tb_lasti; int tb_lineno;\n} PyTracebackObject; 里面有一个 tb_next，所以很容易想到 traceback 也是一个链表结构。其实 traceback 对象的链表结构跟栈帧对象的链表结构是同构的、或者说一一对应的，即一个栈帧对象对应一个 traceback 对象。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 是什么？","id":"290","title":"traceback 是什么？"},"291":{"body":"在 PyTraceBack_Here 函数中我们看到，traceback 对象是通过 _PyTraceBack_FromFrame 创建的，那么秘密就隐藏在这个函数中。 // Python/traceback.c\n_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)\n{ assert(tb_next == NULL || PyTraceBack_Check(tb_next)); assert(frame != NULL); return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_lasti, PyFrame_GetLineNumber(frame));\n} static PyObject *\ntb_create_raw(PyTracebackObject *next, PyFrameObject *frame, int lasti, int lineno)\n{ PyTracebackObject *tb; if ((next != NULL && !PyTraceBack_Check(next)) || frame == NULL || !PyFrame_Check(frame)) { PyErr_BadInternalCall(); return NULL; } // 为 traceback 对象申请内存 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type); if (tb != NULL) { // 设置属性 Py_XINCREF(next); tb->tb_next = next; Py_XINCREF(frame); tb->tb_frame = frame; tb->tb_lasti = lasti; tb->tb_lineno = lineno; PyObject_GC_Track(tb); } return (PyObject *)tb;\n} tb_next 将两个 traceback 连接了起来，不过这个和栈帧的 f_back 正好相反，f_back 指向的是上一个栈帧，而 tb_next 指向的是下一个 traceback。 另外在 traceback 中，还通过 tb_frame 字段和对应的 PyFrameObject 对象建立了联系，当然还有最后执行完毕时的字节码偏移量、以及在源代码中对应的行号。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 创建","id":"291","title":"traceback 创建"},"292":{"body":"traceback 的创建我们知道了，那么它和栈帧对象是怎么联系起来的呢？我们还以之前的代码为例，来解释一下。 def h(): 1 / 0 def g(): h() def f(): g() f() 当执行到函数 h 的 1 / 0 这行代码时，底层会执行 BINARY_TRUE_DIVIDE 指令。 case TARGET(BINARY_TRUE_DIVIDE): { PyObject *divisor = POP(); PyObject *dividend = TOP(); // 调用了数值型对象的泛型 API PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); Py_DECREF(dividend); Py_DECREF(divisor); SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} // Objects/abctract.c\nPyObject *\nPyNumber_TrueDivide(PyObject *v, PyObject *w)\n{ return binary_op(v, w, NB_SLOT(nb_true_divide), \"/\");\n} #define NB_SLOT(x) offsetof(PyNumberMethods, x)\n// 最终会执行 (&PyLong_Type) -> tp_as_methods -> nb_true_divide\n// 即 long_true_divice 函数，看一下它的逻辑 // Objects/longobject.c\nstatic PyObject *\nlong_true_divide(PyObject *v, PyObject *w)\n{ // ... a_size = Py_ABS(Py_SIZE(a)); b_size = Py_ABS(Py_SIZE(b)); negate = (Py_SIZE(a) < 0) ^ (Py_SIZE(b) < 0); // 如果除数为 0，设置 ZeroDivisionError if (b_size == 0) { PyErr_SetString(PyExc_ZeroDivisionError, \"division by zero\"); goto error; } // ... error: return NULL;\n} 由于除数为 0，因此会通过 PyErr_SetString 设置一个异常进去，最终将异常类型、异常值、以及 traceback 保存到线程状态对象中。然后跳转到 error 标签，注意：当前是 long_true_divide 的 error 标签，然后会返回 NULL。 当 long_true_divide 返回 NULL 时，那么变量 quotient 拿到的就是 NULL，由于没有指向一个合法的 PyObject，虚拟机就意识到发生异常了，这时候会跳转到 error 标签。注意：这个 error 标签是帧评估函数里的 error 标签。 在里面会先取出线程状态对象中已有的 traceback 对象，然后以函数 h 的栈帧为参数，创建一个新的 traceback 对象，将两者通过 tb_next 关联起来。最后，再替换掉线程状态对象里面的 traceback 对象。 在虚拟机意识到有异常抛出，并创建了 traceback 之后，它会在当前栈帧中寻找 try except 语句，来执行开发人员指定的异常捕捉动作。如果没有找到，那么虚拟机将退出当前的活动栈帧，并沿着栈帧链回退到上一个栈帧（这里是函数 g 的栈帧），在上一个栈帧中寻找 try except 语句。 就像我们之前说的，函数调用会创建栈帧，当函数执行完毕或者出现异常时，会回退到上一级栈帧。一层一层创建、一层一层返回。至于回退的这个动作，则是在 _PyEval_EvalFrameDefault 的最后完成。 当出现异常时，虚拟机会进入 exception_unwind 标签寻找异常捕获逻辑，相关细节下一篇文章再说，这里就让它抛出去。然后来到 exit_returning 标签，将运行时栈清空。最后进入 exit_eval_frame 标签，将当前线程状态对象中的活跃栈帧设置为上一级栈帧，从而完成栈帧回退的动作。 当栈帧回退时，会进入函数 g 的栈帧，由于返回值为 NULL，所以知道自己调用的函数 h 的内部发生异常了（否则返回值一定会指向一个合法的 PyObject），那么继续寻找异常捕获语句。对于当前这个例子来说，显然是找不到的，于是会从线程状态对象中取出已有的 traceback 对象（函数 h 的栈帧对应的 traceback），然后以函数 g 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 异常会沿着栈帧链进行反向传播，函数 h 出现的异常被传播到了函数 g 中，显然接下来函数 g 要将异常传播到函数 f 中。因为函数 g 在无法捕获异常时，那么返回值也是 NULL，而函数 f 看到返回值为 NULL 时，同样会去寻找异常捕获语句。但是找不到，于是会从线程状态对象中取出已有的 traceback 对象（此时是函数 g 的栈帧对应的 traceback），然后以函数 f 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 最后再传播到模块对应的栈帧中，如果还无法捕获发生的异常，那么虚拟机就要将异常抛出来了。 这个沿着栈帧链不断回退的过程我们称之为栈帧展开，在栈帧展开的过程中，虚拟机不断地创建与各个栈帧对应的 traceback，并将其链接成链表。 由于没有异常捕获，那么接下来会调用 PyErr_Print。然后在 PyErr_Print 中，虚拟机取出维护的 traceback 链表，并进行遍历，将里面的信息逐个输出到 stderr 当中，最终就是我们在 Python 中看到的异常信息。 并且打印顺序是：.py文件、函数f、函数g、函数h。因为每一个栈帧对应一个 traceback，而栈帧又是往后退的，因此显然会从 .py文件对应的 traceback 开始打印，然后通过 tb_next 找到函数 f 对应的 traceback，依次下去。当异常信息全部输出完毕之后，解释器就结束运行了。 因此从链路的开始位置到结束位置，将整个调用过程都输出出来，可以很方便地定位问题出现在哪里。 另外，虽然 traceback 一直在更新（因为要对整个调用链路进行追踪），但是异常类型和异常值始终是不变的，就是函数 h 中抛出的 ZeroDivisionError: division by zero。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 栈帧展开","id":"292","title":"栈帧展开"},"293":{"body":"以上就是虚拟机抛异常的过程，异常在 Python 里面也是一个对象，和其它的实例对象并无本质区别。 exc = StopIteration(\"迭代结束了\")\nprint(exc.value) # 迭代结束了\nprint(exc.args) # ('迭代结束了',) exc = IndexError(\"索引越界了\")\nprint(exc.args) # ('索引越界了',) exc = Exception(\"不知道是啥异常，总之出问题了\")\nprint(exc.args) # ('不知道是啥异常，总之出问题了',) # 异常都有一个 args 属性，以元组的形式保存传递的参数 所谓抛出异常，就是将错误信息输出到 stderr 中，然后停止进程。并且除了虚拟机内部会抛出异常之外，我们还可以使用 raise 关键字手动引发一个异常。 def judge_score(score: int): if score > 100 or score < 0: raise ValueError(\"Score must be between 0 and 100\") 站在虚拟机的角度，score 取任何值都是合理的，但对于我们来说，希望 score 位于 0 ~ 100。那么当 score 不满足 0 ~ 100 时，就可以手动 raise 一个异常。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 小结","id":"293","title":"小结"},"3":{"body":"本文就说到这里，赶快下载 Python 3.8 源码，来和我一起学习 Python 吧（ヾ(◍°∇°◍)ﾉﾞ）。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"1. CPython 源码长什么样子？ » 小结","id":"3","title":"小结"},"30":{"body":"lst = [] 和 lst = list() 都会创建一个空列表，但这两种方式有什么区别呢？ 我们说创建实例对象可以通过解释器提供的特定类型 API，用于内置类型；也可以通过实例化类型对象去创建，既可用于自定义类型，也可用于内置类型。 # 通过特定类型 API 创建\n>>> lst = [] >>> lst\n[]\n# 通过调用类型对象创建\n>>> lst = list() >>> lst\n[] 还是那句话，解释器对内置数据结构了如指掌，并且做足了优化。 看到 123，就知道创建 PyLongObject 实例； 看到 2.71，就知道创建 PyFloatObject 实例； 看到 ( )，就知道创建 PyTupleObject 实例； 看到 [ ]，就知道创建 PyListObject 实例； ······ 这些都会使用特定类型 API 去创建，直接为结构体申请内存，然后设置引用计数和类型，所以使用 [ ] 创建列表是最快的。但如果使用 list() 创建列表，那么就产生了一个调用，要进行参数解析、类型检测、创建栈帧、销毁栈帧等等，所以开销会大一些。 import time start = time.perf_counter()\nfor _ in range(10000000): lst = []\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.2144167000001289\n\"\"\" start = time.perf_counter()\nfor _ in range(10000000): lst = list()\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.4079916000000594\n\"\"\" 通过 [ ] 的方式创建一千万次空列表需要 0.21 秒，但通过 list() 的方式创建一千万次空列表需要 0.40 秒，主要就在于 list() 是一个调用，而 [ ] 会直接被解析成 PyListObject，因此 [ ] 的速度会更快一些。 所以对于内置类型的实例对象而言，使用特定类型 API 创建要更快一些。而且事实上通过类型对象去创建的话，会先调用 tp_new，然后在 tp_new 内部还是调用了特定类型 API。 比如： 创建列表：可以是 list()、也可以是 [ ]； 创建元组：可以是 tuple()、也可以是 ( )； 创建字典：可以是 dict()、也可以是 { }； 前者是通过类型对象创建的，后者是通过特定类型 API 创建的。对于内置类型的实例对象而言，我们推荐使用特定类型 API 创建，会直接解析为对应的 C 一级数据结构，因为这些结构在底层都是已经实现好了的，可以直接用。而无需通过诸如 list() 这种调用类型对象的方式来创建，因为它们内部最终还是使用了特定类型 API，相当于多绕了一圈。 不过以上都是针对内置类型，而自定义的类型就没有这个待遇了，它的实例对象只能通过调用它自己创建。比如 Person 这个类，解释器不可能事先定义一个 PyPersonObject 然后将 API 提供给我们，所以我们只能通过调用 Person 来创建它的实例对象。 另外内置类型被称为静态类，它和它的实例对象在底层已经定义好了，无法动态修改。我们自定义的类型被称为动态类，它是在解释器运行的过程中动态构建的，所以我们可以对其进行动态修改。 事实上 Python 的动态性、GIL 等特性，都是解释器在将字节码翻译成 C 代码时动态赋予的，而内置类型在编译之后已经是指向 C 一级的数据结构，因此也就丧失了相应的动态性。不过与之对应的就是效率上的提升，因为运行效率和动态性本身就是鱼与熊掌的关系。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » [] 和 list()，应该使用哪种方式","id":"30","title":"[] 和 list()，应该使用哪种方式"},"31":{"body":"以上我们就简单分析了 Python 对象的创建过程，当然这只是一个开头，其背后还隐藏了大量的细节，我们后续会慢慢说。 下一篇文章来聊一聊，对象是如何被调用的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"31","title":"小结"},"32":{"body":"在上一篇文章中，我们分析了对象是如何创建的，主要有两种方式，一种是通过特定类型 API，另一种是通过调用类型对象。 对于内置类型的实例对象而言，这两种方式都是支持的，比如列表，我们既可以通过 [ ] 创建，也可以通过 list() 创建，前者是列表的特定类型 API，后者是调用类型对象。但对于自定义类的实例对象而言，我们只能通过调用类型对象的方式来创建。 而一个对象如果可以被调用，那么这个对象就是 callable，否则就不是 callable。那么问题来了，如果一个对象是 callable，那么它都具有哪些特征呢？ 从 Python 的角度看，如果对象是 callable，那么它的类型对象一定实现了 __call__ 函数； 从解释器的角度看，如果对象是 callable，那么它的类型对象的 tp_call 字段一定不为空。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"32","title":"楔子"},"33":{"body":"调用 int 可以创建一个整数，调用 str 可以创建一个字符串，调用 tuple 可以创建一个元组，调用自定义的类也可以创建出相应的实例对象，这就说明类型对象是可调用的，也就是 callable。既然类型对象可调用，那么类型对象的类型对象（type）内部一定实现了 __call__ 函数。 # int 可以调用，那么它的类型对象、也就是元类（type）一定实现了 __call__ 函数\nprint(hasattr(type, \"__call__\")) # True # 而调用一个对象，等价于调用其类型对象的 __call__ 函数\n# 所以 int(2.71) 实际上就等价于如下\nprint(type.__call__(int, 2.71)) # 2 我们说 int、str、float 这些都是类型对象（简单来说就是类），而 123、\"你好\"、2.71 是其对应的实例对象，这些都没问题。但如果相对 type 而言，int、str、float 是不是又成了实例对象呢？因为它们的类型都是 type。 所以 class 具有二象性： 如果站在实例对象（如：123、\"你好\"、2.71）的角度上，它是类型对象； 如果站在 type 的角度上，它是实例对象； 同理，由于 type 的类型还是 type，那么 type 既是 type 的类型对象，type 也是 type 的实例对象。虽然这里描述的有一些绕，但应该不难理解，而为了避免后续的描述出现歧义，这里我们做一个申明： 整数、浮点数、字符串、列表等等，我们称之为实例对象 int、float、str、dict，以及自定义的类，我们称之为类型对象 type 虽然也是类型对象，但我们称它为元类 由于 type 的内部定义了 __call__ 函数，那么说明类型对象都是可调用的，因为调用类型对象就是调用元类 type 的 __call__ 函数。而实例对象能否调用就不一定了，这取决于它的类型对象是否定义了 __call__ 函数，因为调用一个对象，本质上是调用其类型对象内部的 __call__ 函数。 class A: pass a = A()\n# 因为自定义的类 A 里面没有 __call__\n# 所以 a 是不可以被调用的\ntry: a()\nexcept Exception as e: # 告诉我们 A 的实例对象无法被调用 print(e) # 'A' object is not callable # 如果我们给 A 设置了一个 __call__\ntype.__setattr__(A, \"__call__\", lambda self: \"这是__call__\")\n# 发现可以调用了\nprint(a()) # 这是__call__ 这就是动态语言的特性，即便在类创建完毕之后，依旧可以通过 type 进行动态设置，而这在静态语言中是不支持的。所以 type 是所有类的元类，它控制了自定义类的生成过程，因此 type 这个古老而又强大的类可以让我们玩出很多新花样。 但对于内置的类，type 是不可以对其动态增加、删除或者修改属性的，因为内置的类在底层是静态定义好的。从源码中我们看到，这些内置的类、包括元类，它们都是 PyTypeObject 对象，在底层已经被声明为全局变量了，或者说它们已经作为静态类存在了。所以 type 虽然是所有类型对象的类型，但只有面对自定义的动态类，type 才具有对属性进行增删改的能力。 而且在上一篇文章中我们也解释过，Python 的动态性是解释器将字节码翻译成 C 代码的时候赋予的，因此给类对象动态设置属性只适用于动态类，也就是在 py 文件中使用 class 关键字定义的类。而对于静态类，它们在编译之后已经是指向 C 一级的数据结构了，不需要再被解释器解释了，因此解释器自然也就无法在它们身上动手脚，毕竟彪悍的人生不需要解释。 try: type.__setattr__(dict, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'dict' \"\"\" try: type.__setattr__(list, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'list' \"\"\" 同理其实例对象亦是如此，静态类的实例对象也不可以动态设置属性： lst = list()\ntry: lst.name = \"古明地觉\"\nexcept Exception as e: print(e) # 'list' object has no attribute 'name' 在介绍 PyTypeObject 结构体的时候我们说过，静态类的实例对象可以绑定哪些属性，已经写死在 tp_members 字段里面了。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从 Python 的角度看对象的调用","id":"33","title":"从 Python 的角度看对象的调用"},"34":{"body":"如果一个对象可以被调用，那么它的类型对象中一定要有 tp_call，更准确的说是 tp_call 字段的值是一个具体的函数指针，而不是 0。由于 PyList_Type 是可以调用的，这就说明 PyType_Type 内部的 tp_call 是一个函数指针，这在 Python 的层面我们已经验证过了，下面再来通过源码看一下。 在创建 PyType_Type 的时候，PyTypeObject 内部的 tp_call 字段被设置成了 type_call。所以当我们调用 PyList_Type 的时候，会执行 type_call 函数。 因此 list() 在 C 的层面上等价于： (&PyList_Type)->ob_type->tp_call(&PyList_Type, args, kwargs);\n// 即：\n(&PyType_Type)->tp_call(&PyList_Type, args, kwargs);\n// 而在创建 PyType_Type 的时候，给 tp_call 字段传递的是 type_call\n// 因此最终等价于\ntype_call(&PyList_Type, args, kwargs) 如果用 Python 来演示这一过程的话： # 以 list(\"abcd\") 为例，它等价于\nlst1 = list.__class__.__call__(list, \"abcd\")\n# 等价于\nlst2 = type.__call__(list, \"abcd\")\nprint(lst1) # ['a', 'b', 'c', 'd']\nprint(lst2) # ['a', 'b', 'c', 'd'] 这就是 list() 的秘密，相信其它类型在实例化的时候是怎么做的，你已经知道了，做法是相同的。 # dct = dict([(\"name\", \"古明地觉\"), (\"age\", 17)])\ndct = dict.__class__.__call__( dict, [(\"name\", \"古明地觉\"), (\"age\", 17)]\n)\nprint(dct) # {'name': '古明地觉', 'age': 17} # buf = bytes(\"hello world\", encoding=\"utf-8\")\nbuf = bytes.__class__.__call__( bytes, \"hello world\", encoding=\"utf-8\"\n)\nprint(buf) # b'hello world' 当然，目前还没有结束，我们还需要看一下 type_call 的源码实现。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从解释器的角度看对象的调用","id":"34","title":"从解释器的角度看对象的调用"},"35":{"body":"调用类型对象，本质上会调用 type.__call__，在底层对应 type_call 函数，因为 PyType_Type 的 tp_call 字段被设置成了 type_call。当然调用 type 也是如此，因为 type 的类型还是 type。 那么这个 type_call 都做了哪些事情呢？ // Objects/typeobject.c static PyObject *\ntype_call(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 参数 type 表示类型对象或者元类，假设调用的是 list，那么它就是 &PyList_Type // 参数 args 和 kwds 表示位置参数和关键字参数，args 是元组，kwds 是字典 // 指向创建的实例对象，当然也可能是类型对象，取决于参数 type // 如果参数 type 表示元类，那么 obj 会指向类型对象，并且是自定义的动态类 // 如果参数 type 表示类型对象，那么 obj 会指向实例对象 PyObject *obj; // 执行类型对象（也可能是元类）的 tp_new，也就是 __new__ // 如果不存在，那么会报错，而在 Python 中见到的报错信息就是这里指定的 if (type->tp_new == NULL) { PyErr_Format(PyExc_TypeError, \"cannot create '%.100s' instances\", type->tp_name); return NULL; } obj = type->tp_new(type, args, kwds); // 检测调用是否正常，如果调用正常，那么 obj 一定指向一个合法的 PyObject // 而如果 obj 为 NULL，则表示执行出错，此时解释器会抛出异常 obj = _Py_CheckFunctionResult((PyObject*)type, obj, NULL); if (obj == NULL) return NULL; // 这里要做一个额外判断： // 如果参数 type 是 &PyType_Type，也就是 Python 中的元类 // 那么它可以接收一个位置参数（查看对象类型），也可以接收三个位置参数（创建自定义类） // 所以当 type 是 &PyType_Type，位置参数的个数为 1，并且没有传递关键字参数时 // 那么表示查看对象的类型，此时直接返回 obj 即可 if (type == &PyType_Type && PyTuple_Check(args) && PyTuple_GET_SIZE(args) == 1 && (kwds == NULL || (PyDict_Check(kwds) && PyDict_GET_SIZE(kwds) == 0))) return obj; // 到这里说明不是查看对象类型，而是创建类或者实例 // 如果参数 type 是元类，那么表示创建类，此时 args 的长度必须为 3 // 如果参数 type 是类型对象，那么表示创建实例对象 // 所以为了描述方便，我们就假设参数 type 是类型对象，但我们知道它也可以是元类 // 总之到这里 __new__ 已经执行完了，那么之后该干啥了？显然是执行 __init__，但需要先做一个检测 // 如果 __new__ 返回的实例对象的类型不是当前类型，那么直接返回，不再执行 __init__ // 比如自定义 class A，那么在 __new__ 里面应该返回 A 的实例对象，但我们故意返回个 123 // 由于返回值的类型不是当前类型，那么不再执行初始化函数 __init__ if (!PyType_IsSubtype(Py_TYPE(obj), type)) return obj; // 走到这里说明类型一致，那么执行 __init__，将 obj、args、kwds 一起传过去 type = Py_TYPE(obj); if (type->tp_init != NULL) { int res = type->tp_init(obj, args, kwds); if (res < 0) { assert(PyErr_Occurred()); Py_DECREF(obj); obj = NULL; } else { assert(!PyErr_Occurred()); } } // 返回创建的对象 obj，当然准确来说是对象的泛型指针 // 因为 Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针 // 只是有时为了描述方便，我们会说成是对象，这一点我们心里清楚就好 return obj;\n} 所以整个过程就三步： 如果传递的是元类，并且只有一个参数，那么直接返回对象的类型； 否则先调用 tp_new 为实例对象申请内存； 再调用 tp_init（如果有）进行初始化，设置对象属性； 所以这对应了 Python 中的 __new__ 和 __init__，其中 __new__ 负责为实例对象开辟一份内存，然后返回指向对象的指针，并且该指针会自动传递给 __init__ 中的 self。 class Girl: def __new__(cls, name, age): print(\"__new__ 方法执行啦\") # 调用 object.__new__(cls) 创建 Girl 的实例对象 # 然后该对象的指针会自动传递给 __init__ 中的 self return object.__new__(cls) def __init__(self, name, age): print(\"__init__ 方法执行啦\") self.name = name self.age = age g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n__new__ 方法执行啦\n__init__ 方法执行啦\n古明地觉 16\n\"\"\" __new__ 里面的参数要和 __init__ 里面的参数保持一致，因为会先执行 __new__ ，然后解释器再将 __new__ 的返回值和传递的参数组合起来一起传给 __init__。因此从这个角度上讲，设置属性完全可以在 __new__ 里面完成。 class Girl: def __new__(cls, name, age): self = object.__new__(cls) self.name = name self.age = age return self g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n古明地觉 16\n\"\"\" 这样也是没问题的，不过 __new__ 一般只负责创建实例，设置属性应该交给 __init__ 来做，毕竟一个是构造函数、一个是初始化函数，各司其职。另外由于 __new__ 里面不负责初始化，那么它的参数除了 cls 之外，一般都会写成 *args 和 **kwargs。 然后再回过头来看一下 type_call 中的这两行代码： tp_new 应该返回该类型对象的实例对象，而且一般情况下我们是不重写 __new__ 的，会默认执行 object 的 __new__。但如果我们重写了，那么必须要手动返回 object.__new__(cls)。可如果我们不返回，或者返回其它的话，会怎么样呢？ class Girl: def __new__(cls, *args, **kwargs): print(\"__new__ 方法执行啦\") instance = object.__new__(cls) # 打印看看 instance 到底是个啥 print(\"instance:\", instance) print(\"type(instance):\", type(instance)) # 正确做法是将 instance 返回 # 但是我们不返回，而是返回一个整数 123 return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\n\"\"\"\n__new__ 方法执行啦\ninstance: <__main__.Girl object at 0x0000019A2B7270A0>\ntype(instance): <class '__main__.Girl'>\n\"\"\" 这里面有很多可以说的点，首先就是 __init__ 里面需要两个参数，但是我们没有传，却还不报错。原因就在于这个 __init__ 压根就没有执行，因为 __new__ 返回的不是 Girl 的实例对象。 通过打印 instance，我们知道了 object.__new__(cls) 返回的就是 cls 的实例对象，而这里的 cls 就是 Girl 这个类本身。所以我们必须要返回 instance，才会自动执行相应的 __init__。 我们在外部来打印一下创建的实例对象吧，看看结果： class Girl: def __new__(cls, *args, **kwargs): return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\nprint(g)\n\"\"\"\n123\n\"\"\" 我们看到打印的结果是 123，所以再次总结一下 tp_new 和 tp_init 之间的区别，当然也对应 __new__ 和 __init__ 的区别： tp_new：为实例对象申请内存，底层会调用 tp_alloc，至于对象的大小则记录在 tp_basicsize 字段中，而在 Python 里面则是调用 object.__new__(cls)，然后一定要将实例对象返回； tp_init：tp_new 的返回值会自动传递给 self，然后为 self 绑定相应的属性，也就是进行实例对象的初始化； 但如果 tp_new 返回的对象的类型不对，比如 type_call 的第一个参数接收的是 &PyList_Type，但 tp_new 返回的却是 PyTupleObject *，那么此时就不会执行 tp_init。对应上面的 Python 代码就是，Girl 的 __new__ 应该返回 Girl 的实例对象（指针）才对，但却返回了整数，因此类型不一致，不会执行 __init__。 所以都说类在实例化的时候会先调用 __new__，再调用 __init__，相信你应该知道原因了，因为在源码中先调用 tp_new，再调用 tp_init。所以源码层面表现出来的，和我们在 Python 层面看到的是一样的。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » type_call 源码解析","id":"35","title":"type_call 源码解析"},"36":{"body":"到此，我们就从 Python 和解释器两个层面剖析了对象是如何调用的，更准确的说，我们是从解释器的角度对 Python 层面的知识进行了验证，通过 tp_new 和 tp_init 的关系，来了解 __new__ 和 __init__ 的关系。 当然对象调用还不止目前说的这么简单，更多的细节隐藏在了幕后。后续我们会循序渐进，一点点地揭开它的面纱，并且在这个过程中还会不断地学习到新的东西。比如说，实例对象在调用方法的时候会自动将实例本身作为参数传递给 self，那么它为什么会传递呢？解释器在背后又做了什么工作呢？这些在之后的文章中都会详细说明。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"36","title":"小结"},"37":{"body":"之前我们提到了泛型 API，这类 API 的特点是可以处理任意类型的对象，举个例子。 // 返回对象的长度\nPyObject_Size\n// 返回对象的某个属性的值\nPyObject_GetAttr\n// 返回对象的哈希值\nPyObject_Hash\n// 将对象转成字符串后返回\nPyObject_Str 对应到 Python 代码中，就是下面这个样子。 # PyObject_Size\nprint(len(\"古明地觉\"))\nprint(len([1, 2, 3]))\n\"\"\"\n4\n3\n\"\"\" # PyObject_GetAttr\nprint(getattr(\"古明地觉\", \"lower\"))\nprint(getattr([1, 2, 3], \"append\"))\nprint(getattr({}, \"update\"))\n\"\"\"\n<built-in method lower of str object at 0x7f081aa7e920>\n<built-in method append of list object at 0x7f081adc1100>\n<built-in method update of dict object at 0x7f081aa8fd80>\n\"\"\" # PyObject_Hash\nprint(hash(\"古明地觉\"))\nprint(hash(2.71))\nprint(hash(123))\n\"\"\"\n8152506393378233203\n1637148536541722626\n123\n\"\"\" # PyObject_Str\nprint(str(\"古明地觉\"))\nprint(str(object()))\n\"\"\"\n古明地觉\n<object object at 0x7fdfa0209d10>\n\"\"\" 这些 API 能处理任意类型的对象，这究竟是怎么办到的？要想搞清楚这一点，还是要从 PyObject 入手。 我们知道对象在 C 看来就是一个结构体实例，并且结构体嵌套了 PyObject。 # 创建一个浮点数，让变量 var 指向它\nvar = 2.71\n# 创建一个列表，让变量 var 指向它\nvar = [1, 2, 3] 浮点数对应的结构体是 PyFloatObject，列表对应的结构体是 PyListObject，变量 var 是指向对象的指针。那么问题来了，凭啥一个变量可以指向不同类型的对象呢？或者说变量和容器里面为什么可以保存不同对象的指针呢？ 原因在前面的文章中解释的很详细了，因为对象的指针会统一转成 PyObject * 之后再交给变量保存，以创建列表为例。 当然创建浮点数也是同理，因此变量和容器里的元素本质上就是一个泛型指针 PyObject *。而对象的指针在交给变量保存的时候，也都会先转成 PyObject *，因为不管什么对象，它底层的结构体都嵌套了 PyObject。正是因为这个设计，变量才能指向任意的对象。 所以 Python 变量相当于一个便利贴，可以贴在任意对象上。 不过问题来了，由于对象的指针会统一转成 PyObject * 之后再交给变量保存，那么变量怎么知道自己指向的是哪种类型的对象呢？相信你肯定知道答案：通过 ob_type 字段。 对象对应的结构体可以有很多个字段，比如 PyListObject，但变量能看到的只有前两个字段。至于之后的字段是什么，则取决于对象的类型。 所以变量会先通过 ob_type 字段获取对象的类型，如果 ob_type 字段的值为 &PyList_Type，那么变量指向的就是 PyListObject。如果 ob_type 字段的值为 &PyFloat_Type，那么变量指向的就是 PyFloatObject，其它类型同理。当得到了对象的类型，那么再转成相应的指针即可，假设 ob_type 是 &PyList_Type，那么变量会再转成 PyListObject *，这样就可以操作列表的其它字段了。 所以我们再总结一下： 变量和容器里的元素只能保存相同的指针类型，而不同类型的对象，其底层的结构体是不同的。但这些结构体无一例外都嵌套了 PyObject，因此它们的指针会统一转成 PyObject * 之后再交给变量保存。 然后变量在操作对象时，会先通过 ob_type 判断对象的类型，假如是 &PyList_Type，那么会再转成 PyListObject *，其它类型同理。我们以获取列表元素为例： 相信你已经知道为什么泛型 API 可以处理任意类型的对象了，我们再以 PyObject_GetAttr 为例，它内部会调用类型对象的 tp_getattro。 // Objects/object.c // 等价于 getattr(v, name)\nPyObject *\nPyObject_GetAttr(PyObject *v, PyObject *name)\n{ // 获取对象 v 的类型对象 PyTypeObject *tp = Py_TYPE(v); // 属性名称必须是字符串 if (!PyUnicode_Check(name)) { PyErr_Format(PyExc_TypeError, \"attribute name must be string, not '%.200s'\", name->ob_type->tp_name); return NULL; } // 如果类型对象实现了 tp_getattro，那么进行调用 // 等价于 Python 中的 type(v).__getattr__(v, name) if (tp->tp_getattro != NULL) return (*tp->tp_getattro)(v, name); // 否则会退化为 tp_getattr，它要求属性名称必须是 C 字符串 // 不过 tp_getattr 已经废弃，应该使用 tp_getattro if (tp->tp_getattr != NULL) { const char *name_str = PyUnicode_AsUTF8(name); if (name_str == NULL) return NULL; return (*tp->tp_getattr)(v, (char *)name_str); } // 否则说明对象 v 没有该属性 PyErr_Format(PyExc_AttributeError, \"'%.50s' object has no attribute '%U'\", tp->tp_name, name); return NULL;\n} 函数先通过 ob_type 找到对象的类型，然后通过类型对象的 tp_getattro 调用对应的属性查找函数。所以对象的类型不同，PyObject_GetAttr 调用的属性查找函数也不同，而这就是泛型 API 能处理任意对象的秘密。 我们再以 Python 代码为例： class A: def __getattr__(self, item): return f\"class：A，item：{item}\" class B: def __getattr__(self, item): return f\"class：B，item：{item}\" a = A()\nb = B()\nprint(getattr(a, \"some_attr\"))\nprint(getattr(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\"\n# 以上等价于\nprint(type(a).__getattr__(a, \"some_attr\"))\nprint(type(b).__getattr__(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\" 在 Python 里的表现和源码是一致的，我们再举个 iter 的例子： data = [1, 2, 3]\nprint(iter(data))\nprint(type(data).__iter__(data))\n\"\"\"\n<list_iterator object at 0x7fb8200f29a0>\n<list_iterator object at 0x7fb8200f29a0>\n\"\"\" 如果一个对象支持创建迭代器，那么它的类型对象一定实现了 __iter__，通过 type(data) 可以获取到类型对象，然后再将 data 作为参数调用 __iter__ 即可。 所以通过 ob_type 字段，这些泛型 API 实现了类似多态的效果，一个函数，多种实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"9. 再探泛型 API，感受 Python 对象的设计哲学","id":"37","title":"9. 再探泛型 API，感受 Python 对象的设计哲学"},"38":{"body":"我们知道所有类型对象在底层都由结构体 PyTypeObject 实例化得到，但内部字段接收的值不同，得到的类型对象就不同。类型对象不同，那么实例对象的表现就不同，这也正是一种对象区别于另一种对象的关键所在。 比如 PyLong_Type 的 tp_iter 是空，那么整数就不是可迭代对象，而 PyList_Type 的 tp_iter 不是空，那么列表就是可迭代对象。再比如 PyLong_Type 和 PyFloat_Type，虽然内部都实现了 tp_hash，但它们是不同的类型，所以整数和浮点数的哈希值计算方式也不一样。 因此类型对象决定了实例对象的行为，比如能否调用、能否计算哈希值、能否迭代等等，这些都由类型对象决定。 PyTypeObject 里面定义了很多函数指针，比如 tp_call、tp_hash 等等，它们可能指向某个具体的函数，也可能为空。这些函数指针可以看做是类型对象所定义的操作，这些操作决定了其实例对象在运行时的行为。 class A: # tp_new def __new__(cls, *args, **kwargs): pass # tp_init def __init__(self): pass # tp_call def __call__(self): pass # tp_getattro def __getattr__(self, attr): pass # tp_setattro def __setattr__(self, key, value): pass ... ... 像 tp_call、tp_hash、tp_new 等字段会直接对应 Python 里的魔法函数，它们以双下划线开头、以双下划线结尾。但除了魔法函数之外，每种类型还可以有很多自定义的成员函数。 # 自定义 foo 和 bar\nclass A: def foo(self): pass def bar(self): pass # 当然内置类型也是如此\n# 像 str 定义了 join、split、upper 等\nprint(str.join)\nprint(str.split)\nprint(str.upper)\n# 像 list 定义了 append、extend，insert 等\nprint(list.append)\nprint(list.extend)\nprint(list.insert) 这些自定义的函数会一起保存在类型对象的 tp_methods 里面，负责让实例对象更具有表现力。另外需要补充的是，类型对象里面定义的是函数，也叫成员函数，但实例对象在获取之后会自动包装成方法。所以当提到魔法函数和魔法方法时，其实表达的是同一个意思，只不过一个是站在类的角度，一个是站在实例的角度。 所以实例对象能调用的方法都定义在类型对象里面，并且通过实例调用本质上就是一个语法糖，但用起来更加优雅。假设有一个类 A，实例对象为 a，那么 a.some() 底层会转成 A.some(a)，至于这背后的细节后续再聊。 但除了以上这些，PyTypeObject 还提供了三个字段。 每个字段分别指向一个结构体实例，结构体实例中有大量的字段，这些字段都是函数指针，指向了具体的函数。所以它们也被称为方法簇，分别应用于如下操作。 tp_as_number：负责数值型操作，比如整数、浮点数的加减乘除； tp_as_sequence：负责序列型操作，比如字符串、列表、元组等通过索引取值的行为； tp_as_mapping：负责映射型操作，比如字典通过 key 映射出 value； 我们以 tp_as_number 为例，它指向 PyNumberMethods 类型的结构体实例，那么这个结构体长什么样子呢？ // Include/cpython/object.h typedef struct { // __add__，对应 + 操作符，如 a + b binaryfunc nb_add; // __sub__，对应 - 操作符，如 a - b binaryfunc nb_subtract; // __mul__，对应 * 操作符，如 a * b binaryfunc nb_multiply; // __mod__，对应 % 操作符，如 a % b binaryfunc nb_remainder; // __divmod__，对应 divmode 函数，如 divmod(a, b) binaryfunc nb_divmod; // __power__，对应 ** 操作符，如 a ** b ternaryfunc nb_power; // __neg__，对应 - 操作符，如 -a unaryfunc nb_negative; // __pos__，对应 + 操作符，如 +a unaryfunc nb_positive; // __abs__，对应 abs 函数，如 abs(a) unaryfunc nb_absolute; // __bool__，如 bool(a) inquiry nb_bool; // __invert__，对应 ~ 操作符，如 ~a unaryfunc nb_invert; // __lshift__，对应 << 操作符，如 a << b binaryfunc nb_lshift; // __rshift__，对应 >> 操作符，如 a >> b binaryfunc nb_rshift; // __and__，对应 & 操作符，如 a & b binaryfunc nb_and; // __xor__，对应 ^ 操作符，如 a ^ b binaryfunc nb_xor; // __or__，对应 | 操作符，如 a | b binaryfunc nb_or; // __int__，如 int(a) unaryfunc nb_int; // ...\n} PyNumberMethods; 你看到了什么？是不是想到了 Python 里面的魔法方法，所以它们也被称为方法簇。 在 PyNumberMethods 这个方法簇里面定义了作为一个数值对象应该支持的操作，同理，在 PySequenceMethods 和 PyMappingMethods 中分别定义了作为一个序列对象和映射对象应该支持的操作，这两种对象的典型例子就是 list 和 dict。 所以，只要类型对象提供相关操作，实例对象便具备对应的行为，因为实例对象所调用的方法都是由类型对象提供的。 class Girl: def __init__(self, name, age): self.name = name self.age = age def say(self): pass def cry(self): pass g = Girl(\"古明地觉\", 16)\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16}\nprint(\"say\" in Girl.__dict__) # True\nprint(\"cry\" in Girl.__dict__) # True 实例对象的属性字典，只包含了一些在 __init__ 里面设置的属性而已，而实例能够调用的 say、cry 都是定义在类型对象中的。 因此一定要记住：类型对象定义的操作，决定了实例对象的行为。 class Int(int): def __getitem__(self, item): return item a = Int(1)\nb = Int(2) print(a + b) # 3\nprint(a[\"你好\"]) # 你好 继承了 int 的自定义类 Int 在实例化之后自然是一个数值对象，但 a[\"\"] 却是一个类似于字典才具有的行为，那为什么可以实现呢？原因就是我们重写了 __getitem__ 这个魔法函数，它在底层对应 PyMappingMethods 中的 mp_subscript 操作，因此最终 Int 实例对象表现的像一个字典一样。 归根结底就在于这几个方法簇都只是 PyTypeObject 的一个字段罢了，默认使用 PyTypeObject 结构体创建的 PyLong_Type 所生成的实例对象（整数）是不具备列表和字典的属性特征的。但我们通过继承 PyLong_Type，同时指定 __getitem__，使得构建出来的类型对象所生成的实例对象，同时具备多种属性特征，就是因为解释器支持这种做法。 自定义的类在底层也是 PyTypeObject 结构体实例，而在继承 int 的时候，将其内部定义的 PyNumberMethods 方法簇也继承了下来，而我们又单独实现了 PyMappingMethods 中的 mp_subscript。所以自定义类 Int 的实例对象具备了整数的全部行为，以及字典的部分行为（因为我们只实现了 __getitem__）。 下面再通过 PyLong_Type 实际考察一下： 整数对象支持数值操作，所以在创建 PyLong_Type 时，实现了 tp_as_number。但整数显然不支持序列和映射操作，因此字段 tp_as_sequence 和 tp_as_mapping 就是 0，相当于空。 而 tp_as_number 字段被赋值为 long_as_number，看一下它长什么样。 里面的 long_add、long_sub、long_mul 等等显然都是已经定义好的函数指针，在创建 PyNumberMethods 结构体实例 long_as_number 的时候，这些函数指针分别赋值给了字段 nb_add、nb_substract、nb_multiply 等等。然后创建完 long_as_number 之后，再将其指针交给 PyLong_Type 的 tp_as_number 字段。 因此整数在操作的时候，比如相加，会先通过 变量->ob_type->tp_as_number->nb_add 获取该操作对应的函数指针，其中 int 类型对象的 tp_as_number 字段的值是 &long_as_number，因此获取其字段 nb_add 的时候，拿到的就是 long_add 函数指针，然后调用。 同理 float 类型里的 tp_as_number 字段则被赋值成了 &float_as_number，获取 nb_add 字段的时候，拿到的就是 float_add 函数指针。不同类型的对象的行为不同，它们都有属于自己的一组方法簇。 最后再画一张图总结一下，假设有两个变量，分别是 e = 2.71 和 num = 666。 所以对象的行为是由其类型对象定义的操作所决定的，比如一个对象可以计算长度，那么它的类型对象要实现 __len__；一个对象可以转成整数，那么它的类型对象要实现 __int__ 或 __index__。 class A: def __len__(self): return 123 def __int__(self): return 456 a = A()\nprint(len(a)) # 123\nprint(int(a)) # 456\n# len(a) 在底层会执行 A.__len__(a)\n# int(a) 在底层会执行 A.__int__(a)\nprint(A.__len__(a)) # 123\nprint(A.__int__(a)) # 456 总之核心就是一句话：类型对象定义了哪些操作，决定了实例对象具有哪些行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"10. Python 对象的行为是怎么区分的？","id":"38","title":"10. Python 对象的行为是怎么区分的？"},"39":{"body":"如果对编程语言进行分类的话，一般可以分为静态语言和动态语言，也可以分为编译型语言和解释型语言。但个人觉得还有一种划分标准，就是是否自带垃圾回收。关于有没有垃圾回收，陈儒老师在《Python 2.5源码剖析》中，总结得非常好。 对于像 C 和 C++ 这类语言，程序员被赋予了极大的自由，可以任意地申请内存。但权力的另一面对应着责任，程序员最后不使用的时候，必须负责将申请的内存释放掉，并把无效指针设置为空。可以说，这一点是万恶之源，大量内存泄漏、悬空指针、越界访问的 bug 由此产生。 而现代的开发语言（比如 C#、Java）都带有垃圾回收机制，将开发人员从维护内存分配和清理的繁重工作中解放出来，开发者不用再担心内存泄漏的问题，但同时也被剥夺了和内存亲密接触的机会，并牺牲了一定的程序运行效率。不过好处就是提高了开发效率，并降低了 bug 发生的概率。 由于现在的垃圾回收机制已经非常成熟了，把对性能的影响降到了最低，因此大部分场景选择的都是带垃圾回收的语言。 而 Python 里面同样具有垃圾回收，只不过它是为引用计数机制服务的。所以解释器通过引用计数和垃圾回收，代替程序员进行繁重的内存管理工作，关于垃圾回收我们后面会详细说，先来看一下引用计数。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 楔子","id":"39","title":"楔子"},"4":{"body":"在学习 Python 的时候，你肯定听过这么一句话：Python 中一切皆对象。没错，在 Python 世界里，一切都是对象。整数是一个对象、字符串是一个对象、字典是一个对象，甚至 int, str, list 以及我们使用 class 关键字自定义的类，它们也是对象。 像 int, str, list 等基本类型，以及自定义的类，由于它们可以表示类型，因此我们称之为类型对象；类型对象实例化得到的对象，我们称之为实例对象。但不管是哪种对象，它们都属于对象。因此 Python 将面向对象理念贯彻的非常彻底，面向对象中的类和对象在 Python 中都是通过对象实现的。 在面向对象理论中，存在着类和对象两个概念，像 int、dict、tuple、以及使用 class 关键字自定义的类型对象实现了面向对象理论中类的概念，而 123、3.14、\"string\" 等实例对象则实现了面向对象理论中对象的概念。但在 Python 里面，面向对象中的类和对象都是通过对象实现的。 我们举个例子： # dict 是一个类，因此它属于类型对象\n# 类型对象实例化得到的对象属于实例对象\nprint(dict)\n\"\"\"\n<class 'dict'>\n\"\"\"\nprint(dict(a=1, b=2))\n\"\"\"\n{'a': 1, 'b': 2}\n\"\"\" 因此可以用一张图来描述面向对象在 Python 中的体现。 而如果想查看一个对象的类型，可以使用 type，或者通过对象的 __class__ 属性。 data = [1, 2, 3]\n# 查看类型\nprint(type(data))\n\"\"\"\n<class 'list'>\n\"\"\"\nprint(data.__class__)\n\"\"\"\n<class 'list'>\n\"\"\" 如果想判断一个对象是不是指定类型的实例对象，可以使用 isinstance。 data = [1, 2, 3]\n# 判断是不是指定类型的实例对象\nprint(isinstance(data, list))\n\"\"\"\nTrue\n\"\"\" 但是问题来了，按照面向对象的理论来说，对象是由类实例化得到的，这在 Python 中也是适用的。既然是对象，那么就必定有一个类来实例化它，换句话说对象一定要有类型。至于一个对象的类型是什么，就看这个对象是被谁实例化的，被谁实例化，那么类型就是谁，比如列表的类型是 list，字典的类型是 dict 等等。 而 Python 中一切皆对象，所以像 int, str, tuple 这些内置的类对象也是具有相应的类型的，那么它们的类型又是谁呢？使用 type 查看一下就知道了。 print(type(int)) # <class 'type'>\nprint(type(str)) # <class 'type'>\nprint(type(dict)) # <class 'type'>\nprint(type(type)) # <class 'type'> 我们看到类型对象的类型，无一例外都是 type。而 type 我们也称其为元类，表示类型对象的类型。至于 type 本身，它的类型还是 type，所以它连自己都没放过，把自己都变成自己的对象了。 因此在 Python 中，你能看到的任何对象都是有类型的，可以使用 type 查看，也可以获取该对象的 __class__ 属性查看。所以：实例对象、类型对象、元类，Python 中任何一个对象都逃不过这三种身份。 到这里可能有人会发现一个有意思的点，我们说 int 是一个类对象，这显然是没有问题的。因为站在整数（比如 123）的角度上，int 是一个不折不扣的类对象；但如果站在 type 的角度上呢？显然我们又可以将 int 理解为实例对象，因此 class 具有二象性。 至于 type 也是同理，虽然它是元类，但本质上也是一个类对象。 注：不仅 type 是元类，那些继承了 type 的类也可以叫做元类。 然后 Python 中还有一个关键的类型（对象），叫做 object，它是所有类型对象的基类。不管是什么类，内置的类也好，我们自定义的类也罢，它们都继承自 object。因此 object 是所有类型对象的基类、或者说父类。 那如果我们想获取一个类都继承了哪些基类，该怎么做呢？方式有三种： class A: pass class B: pass class C(A): pass class D(B, C): pass # 首先 D 继承自 B 和 C, C 又继承 A\n# 我们现在要来查看 D 继承的父类 # 方法一: 使用 __base__\nprint(D.__base__) \"\"\"\n<class '__main__.B'>\n\"\"\" # 方法二: 使用 __bases__\nprint(D.__bases__) \"\"\"\n(<class '__main__.B'>, <class '__main__.C'>)\n\"\"\" # 方法三: 使用 __mro__\nprint(D.__mro__)\n\"\"\"\n(<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>)\n\"\"\" __base__：如果继承了多个类，那么只显示继承的第一个类，没有显式继承则返回 <class 'object'> __bases__：返回一个元组，会显示所有直接继承的父类，没有显式继承则返回 (<class 'object'>,) __mro__: mro（Method Resolution Order）表示方法查找顺序，会从自身出发，找到最顶层的父类。因此返回自身、继承的基类、以及基类继承的基类，一直找到 object 而如果想查看某个类型是不是另一个类型的子类，可以通过 issubclass。 print(issubclass(str, object))\n\"\"\"\nTrue\n\"\"\" 因此，我们可以得出以下两个结论： type 站在类型金字塔的最顶端，任何一个对象按照类型追根溯源，最终得到的都是 type； object 站在继承金字塔的最顶端，任何一个类型对象按照继承关系追根溯源，最终得到的都是 object； 但要注意的是，我们说 type 的类型还是 type，但 object 的基类则不再是 object，而是 None。 print(type.__class__) # <class 'type'> # 注：以下打印结果容易让人产生误解\n# 它表达的含义是 object 的基类为空\n# 而不是说 object 继承 None\nprint(object.__base__) # None 但为什么 object 的基类是 None，而不是它自身呢？其实答案很简单，Python 在查找属性或方法的时候，自身如果没有的话，会按照 __mro__ 指定的顺序去基类中查找。所以继承链一定会有一个终点，否则就会像没有出口的递归一样出现死循环了。 我们用一张图将对象之间的关系总结一下： 实例对象的类型是类型对象，类型对象的类型是元类； 所有类型对象的基类都收敛于 object； 所有对象的类型都收敛于 type； 因此 Python 算是将 一切皆对象 的理念贯彻到了极致，也正因为如此，Python 才具有如此优秀的动态特性。 但是还没结束，我们再重新审视一下上面那张图，会发现里面有两个箭头看起来非常的奇怪。object 的类型是 type，type 又继承了 object。 print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 因为 type 是所有类的元类，而 object 是所有类的基类，这就说明 type 要继承自 object，而 object 的类型是 type。很多人都会对这一点感到奇怪，这难道不是一个先有鸡还是先有蛋的问题吗？答案不是的，这两个对象是共存的，它们之间的定义是互相依赖的。而具体是怎么一回事，我们后续分析。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » Python 中一切皆对象","id":"4","title":"Python 中一切皆对象"},"40":{"body":"Python 一切皆对象，所有对象都有一个 ob_refcnt 字段，该字段维护着对象的引用计数，从而也决定对象的存在与消亡。下面来探讨一下引用计数，当然引用计数在介绍 PyObject 的时候说的很详细了，这里再回顾一下。 但需要说明的是，比起类型对象，我们更关注实例对象的行为。引用计数也是如此，只有实例对象，我们探讨引用计数才是有意义的。因为内置的类型对象超越了引用计数规则，永远都不会被析构，或者销毁，因为它们在底层是被静态定义好的。同理，自定义的类虽然可以被回收，但是探讨它的引用计数也是没有价值的。我们举个栗子： class A: pass del A 首先 del 关键字只能作用于变量，不可以作用于对象。比如 e = 2.71，可以 del e，但是不可以 del 2.71，这是不符合语法规则的。因为 del 的作用是删除变量，并将其指向的对象的引用计数减 1，所以我们只能 del 变量，不可以 del 对象。 至于 def、class 语句执行完之后拿到的也是变量，前面说了，Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针。比如上面代码中的 class A，它会先创建一个类对象，然后再让变量 A 指向这个类对象。所以我们拿到的 A 也是一个变量，只要是变量，就可以被 del。但是 del 变量只是删除了该变量，换言之就是让该变量无法再被使用，至于变量指向的对象是否会被回收，就看是否还有其它的变量也指向它。 总结：对象是否会被回收，完全由解释器判断它的引用计数是否为 0 所决定。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数","id":"40","title":"引用计数"},"41":{"body":"操作引用计数无非就是将其加一或减一，至于什么时候加一、什么时候减一，在介绍 PyObject 的时候已经说的很详细了。这里我们通过源码，看看引用计数具体是怎么操作的。 在底层，解释器会通过 Py_INCREF 和 Py_DECREF 两个宏来增加和减少对象的引用计数，而当对象的引用计数为 0 时，会调用对应的析构函数来销毁该对象，这个析构函数由对象的类型对象内部的 tp_dealloc 字段决定。 下面我们来看看底层实现，不过在介绍 Py_INCREF 和 Py_DECREF 之前，先来看几个其它的宏，这些宏非常常见，有必要单独说一下。 // Include/object.h // 将对象的指针转成 PyObject *\n#define _PyObject_CAST(op) ((PyObject*)(op))\n// 将对象的指针转成 PyVarObject *\n#define _PyVarObject_CAST(op) ((PyVarObject*)(op)) // 返回对象的引用计数，即对象的 ob_refcnt 字段\n#define Py_REFCNT(ob) (_PyObject_CAST(ob)->ob_refcnt)\n// 返回对象的类型，即对象的 ob_type 字段\n#define Py_TYPE(ob) (_PyObject_CAST(ob)->ob_type)\n// 返回对象的长度，即对象的 ob_size 字段\n#define Py_SIZE(ob) (_PyVarObject_CAST(ob)->ob_size) 然后再来看看 Py_INCREF 和 Py_DECREF，它们负责对引用计数执行加一和减一操作。 // Include/object.h // 将对象的 ob_refcnt 加 1\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op))\nstatic inline void _Py_INCREF(PyObject *op)\n{ _Py_INC_REFTOTAL; op->ob_refcnt++;\n} // 将对象的 ob_refcnt 减 1\n#define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))\ntatic inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ (void)filename; /* may be unused, shut up -Wunused-parameter */ (void)lineno; /* may be unused, shut up -Wunused-parameter */ _Py_DEC_REFTOTAL; // 将引用计数减 1 之后进行判断，如果结果不等于 0，则什么也不做 if (--op->ob_refcnt != 0) { // 正常情况下，Py_REF_DEBUG 宏不会被定义，因为引用计数不可能小于 0\n#ifdef Py_REF_DEBUG if (op->ob_refcnt < 0) { _Py_NegativeRefcount(filename, lineno, op); }\n#endif } // 否则说明引用计数为 0，意味着对象已经不被任何变量引用了，那么应该被销毁 else { // 调用 _Py_Dealloc 将对象销毁，这个 _Py_Dealloc 函数内部的逻辑很简单 // 虽然里面存在宏判断，但如果只看编译后的最终结果，那么代码就只有下面两行 /* destructor dealloc = Py_TYPE(op)->tp_dealloc; * (*dealloc)(op); */ // 会获取类型对象的 tp_dealloc，然后调用，销毁实例对象 _Py_Dealloc(op); }\n} 以上就是 Py_INCREF 和 Py_DECREF 两个宏的具体实现，但是它们不能接收空指针，如果希望能接收空指针，那么可以使用另外两个宏。 // Include/object.h #define Py_XINCREF(op) _Py_XINCREF(_PyObject_CAST(op))\nstatic inline void _Py_XINCREF(PyObject *op)\n{ if (op != NULL) { Py_INCREF(op); }\n} #define Py_XDECREF(op) _Py_XDECREF(_PyObject_CAST(op))\nstatic inline void _Py_XDECREF(PyObject *op)\n{ if (op != NULL) { Py_DECREF(op); }\n} 所以 Py_XINCREF 和 Py_XDECREF 会额外对指针做一次判断，如果为空则什么也不做，不为空再调用 Py_INCREF 和 Py_DECREF。而当一个对象的引用计数为 0 时，与该对象对应的析构函数就会被调用。 但要特别注意的是，我们上面说调用析构函数之后会回收对象，或者说销毁对象，意思是将这个对象从内存中抹去，但并不意味着要释放空间，也就是对象没了，但对象占用的内存却还在。 如果对象没了，占用的内存也要释放的话，那么频繁申请、释放内存空间会使 Python 的执行效率大打折扣，更何况 Python 已经背负了人们对其执行效率的不满这么多年。 所以 Python 底层大量采用了缓存池的技术，使用这种技术可以避免频繁地申请和释放内存空间。因此在析构的时候，只是将对象占用的空间放到缓存池中，并没有真的释放。 这一点，在后面剖析内置实例对象的实现中，将会看得一清二楚，因为大部分内置的实例对象都会有自己的缓存池。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数的相关操作","id":"41","title":"引用计数的相关操作"},"42":{"body":"到此我们就把这些基础概念说完了，后续你会发现目前花费的这些笔墨都是值得的，总之先对 Python 有一个宏观的认识，然后再学习具体的数据结构就简单多了。 所以从下一篇文章开始就要详细剖析内置对象的底层实现了，比如浮点数、复数、整数、布尔值、None、bytes 对象、bytearray 对象、字符串、元组、列表、字典、集合等等，所有的内置对象都会详细地剖析一遍，看看它是如何实现的。 有了目前为止的这些基础，我们后面就会轻松很多。先把对象、变量等概念梳理清楚，然后再来搞这些数据结构的底层实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 小结","id":"42","title":"小结"},"43":{"body":"从现在开始，我们就来分析 Python 的内置对象，看看它们在底层是如何实现的。但说实话，我们在前面几篇文章中介绍对象的时候，已经说了不少了，不过从现在开始要进行更深入的分析。 除了对象本身，还要看对象支持的操作在底层是如何实现的。我们首先以浮点数为例，因为它是最简单的，没错，浮点数比整数要简单，至于为什么，等我们分析整数的时候就知道了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 楔子","id":"43","title":"楔子"},"44":{"body":"要想搞懂浮点数的实现原理，就要知道它在底层是怎么定义的，当然在这之前我们已经见过它很多遍了。 // Include/floatobject.h\ntypedef struct { PyObject_HEAD double ob_fval;\n} PyFloatObject; 它包含了一个公共头部 PyObject 和一个 double 类型的 ob_fval 字段，毫无疑问这个 ob_fval 字段负责存储浮点数的具体数值。 我们以 e = 2.71 为例，底层结构如下。 还是很简单的，每个对象在底层都是由结构体表示的，这些结构体中有的字段负责维护对象的元信息，有的字段负责维护具体的值。比如这里的 2.71，总要有一个字段来存储 2.71 这个值，而这个字段就是 ob_fval。所以浮点数的结构非常简单，直接使用一个 C 的 double 来维护。 假设我们要将两个浮点数相加，相信你已经知道解释器会如何做了。通过 PyFloat_AsDouble 将两个浮点数的 ob_fval 抽出来，然后相加，最后再根据相加的结果创建一个新的 PyFloatObject 即可。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数的底层结构","id":"44","title":"浮点数的底层结构"},"45":{"body":"下面来看看浮点数是如何创建的，在前面的文章中，我们说内置对象可以使用对应的特定类型 API 创建，也可以通过调用类型对象创建。 调用类型对象 float 创建实例对象，解释器会执行元类 type 的 tp_call，它指向了 type_call 函数。然后 type_call 内部会先调用类型对象（这里是 float）的 tp_new 为其实例对象申请一份空间，申请完毕之后对象就创建好了。然后再调用 tp_init，并将实例对象作为参数传递进去，进行初始化，也就是设置属性。 但是对于 float 来说，它内部的 tp_init 字段为 0，也就是空。 这就说明 float 没有 __init__，因为浮点数太过简单，只需要一个 tp_new 即可。我们举个例子： class Girl1: def __init__(self, name, age): self.name = name self.age = age # __new__ 负责开辟空间、生成实例对象\n# __init__ 负责给实例对象绑定属性 # 但其实 __init__ 所做的工作可以直接在 __new__ 当中完成\n# 换言之有 __new__ 就足够了，其实可以没有__init__\n# 我们将上面的例子改写一下 class Girl2: def __new__(cls, name, age): instance = object.__new__(cls) instance.name = name instance.age = age return instance g1 = Girl1(\"古明地觉\", 16)\ng2 = Girl2(\"古明地觉\", 16)\nprint(g1.__dict__ == g2.__dict__) # True 我们看到效果是等价的，因为 __init__ 负责给 self 绑定属性，而这个 self 是 __new__ 返回的。那么很明显，我们也可以在 __new__ 当中绑定属性，而不需要 __init__。 但是按照规范，属性绑定应该放在 __init__ 中执行。只是对于浮点数而言，由于其结构非常简单，所以底层就没有给 float 实现 __init___，所有操作都是在 __new__ 当中完成的。 print(float.__init__ is object.__init__) # True\nprint(tuple.__init__ is object.__init__) # True\nprint(list.__init__ is object.__init__) # False 所以 float 没有 __init__，即便获取拿到的也是 object 的 __init__，因为 object 是 float 的基类。同理 tuple 也没有，但 list 是有的。 那么下面就来看一下 PyFloat_Type 的 tp_new，看它是如何创建浮点数的。通过 PyFloat_Type 的定义我们可以看到，在创建的时候给 tp_new 字段设置的是 float_new，那么一切秘密就隐藏在 float_new 里面。 // Objects/clinic/floatobject.c.h\nstatic PyObject *\nfloat_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)\n{ PyObject *return_value = NULL; PyObject *x = _PyLong_Zero; // float 不接收关键字参数，如果传递了，那么报错 if ((type == &PyFloat_Type) && !_PyArg_NoKeywords(\"float\", kwargs)) { goto exit; } // float 只接收 0 到 1 个位置参数，如果不满足，那么报错 if (!_PyArg_CheckPositional(\"float\", PyTuple_GET_SIZE(args), 0, 1)) { goto exit; } // 如果参数个数为 0，说明调用 float 时没传参数，那么直接跳转到 skip_optional 标签 // 由于变量 x 的值初始为 _PyLong_Zero，所以在 Python 中，float() 和 float(0) 是等价的 if (PyTuple_GET_SIZE(args) < 1) { goto skip_optional; } // 否则说明传递了一个参数，那么获取该参数 x = PyTuple_GET_ITEM(args, 0);\nskip_optional: // 调用 float_new_impl，拿到返回值 // 所以核心实现位于 float_new_impl 函数中 return_value = float_new_impl(type, x); exit: return return_value;\n} // Objects/floatobject.c\nstatic PyObject *\nfloat_new_impl(PyTypeObject *type, PyObject *x)\n{ // 如果 type 不是 &PyFloat_Type，那么必须是它的子类，否则调用 float_subtype_new 会报错 // 但该条件很少触发，因为创建的是浮点数，所以 type 自然是 &PyFloat_Type if (type != &PyFloat_Type) return float_subtype_new(type, x); // 然后检测 x 的类型，如果它是一个字符串，那么就根据字符串创建浮点数，比如 float(\"3.14\") if (PyUnicode_CheckExact(x)) return PyFloat_FromString(x); // 不是字符串，则调用 PyNumber_Float return PyNumber_Float(x);\n} 再来看看 PyNumber_Float。 // Objects/abstract.c\nPyObject *\nPyNumber_Float(PyObject *o)\n{ PyNumberMethods *m; // 如果传递的是 NULL，直接返回错误 if (o == NULL) { return null_error(); } // 如果传递的本身就是个浮点数，那么增加引用计数，直接返回 if (PyFloat_CheckExact(o)) { Py_INCREF(o); return o; } // 走到这里说明对象不是浮点数，那么它必须要能转成浮点数 // 也就是类型对象的内部要有 __float__ 这个魔法函数，即 nb_float // 获取方法簇 m = o->ob_type->tp_as_number; // 如果方法簇不为空，并且也实现了 nb_float if (m && m->nb_float) { // 那么获取 nb_float 指向的函数并调用，将对像转成浮点数 PyObject *res = m->nb_float(o); double val; // 如果 res 不为 NULL，并且是浮点数，那么返回 // PyFloat_CheckExact 负责检测一个对象的类型是否是 <class 'float'> // 其逻辑等价于 type(res) is float if (!res || PyFloat_CheckExact(res)) { return res; } // 走到这里说明 __float__ 返回的对象不是浮点数，即对象的类型不是 float // 如果不是 float，那么 float 的子类目前也是可以的（会抛警告） // PyFloat_Check 负责检测对象的类型是否是 float 或者其子类 // 其逻辑等价于 isinstance(res, float) if (!PyFloat_Check(res)) { // 如果返回的对象的类型不是 float 或者其子类，那么报错 PyErr_Format(PyExc_TypeError, \"%.50s.__float__ returned non-float (type %.50s)\", o->ob_type->tp_name, res->ob_type->tp_name); Py_DECREF(res); return NULL; } // 到这里说明返回的对象的类型是 float 的子类，此时也是合法的，但会抛出警告 if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, \"%.50s.__float__ returned non-float (type %.50s). \" \"The ability to return an instance of a strict subclass of float \" \"is deprecated, and may be removed in a future version of Python.\", o->ob_type->tp_name, res->ob_type->tp_name)) { Py_DECREF(res); return NULL; } // res 虽然是 float 子类的实例对象，但依旧具备浮点数的特征，因此将内部的数值抽出来 val = PyFloat_AS_DOUBLE(res); // 减少 res 指向对象的引用计数 Py_DECREF(res); // 创建 PyFloatObject 实例，并返回它的泛型指针 // 因此即使 __float__ 返回的是 float 子类的实例对象，也会默认转成 float 对象（浮点数）返回 return PyFloat_FromDouble(val); } // 如果 float 接收的参数没有实现 nb_float（__float__），那么会去找 nb_index（__index__） if (m && m->nb_index) { // 内部会调用对象的 nb_index PyObject *res = PyNumber_Index(o); if (!res) { return NULL; } // __index__ 返回的必须是整数 // 所以调用的是 PyLong_AsDouble，表示基于 Python 整数创建 C 浮点数 double val = PyLong_AsDouble(res); Py_DECREF(res); if (val == -1.0 && PyErr_Occurred()) { return NULL; } // 通过 C 浮点数创建 Python 浮点数 return PyFloat_FromDouble(val); } // 到这里说明对象没有实现 __float__ 和 __index__ // 那么检测传递的对象的类型是不是 float 的子类 // 如果是，证明它的结构和浮点数是一致的 // 直接根据 ob_fval 构建 PyFloatObject if (PyFloat_Check(o)) { return PyFloat_FromDouble(PyFloat_AS_DOUBLE(o)); } // 如果以上条件都不满足，说明它有可能是字节串、字节数组、字符串（但类型是 str 的子类）等等 // 那么直接交给 PyFloat_FromString return PyFloat_FromString(o);\n} 所以一个 float 调用居然要走这么多逻辑，总之解释器为我们考虑了很多。我们用 Python 来演绎一下： # 2.71 是一个字符串，所以在 float_new_impl 里面直接调用 PyFloat_FromString\nprint(float(\"2.71\")) # 2.71 class E: def __float__(self): return 2.71 # 传递的参数是一个 E 类型，所以会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_float，所以会直接调用\nprint(float(E())) # 2.71 class N: def __index__(self): return 3 # N 不是字符串类型，显然也会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_index，所以会直接调用\nprint(float(N())) # 3.0 class PI: class Float(float): pass def __float__(self): return self.Float(3.14) # 显然会调用内部的 __float__，但 __float__ 返回的不是 float 实例，而是 float 子类的实例\n# 虽然这种做法是允许的，但会抛出警告，警告的内容就是源码中描述的那样\n# DeprecationWarning: PI.__float__ returned non-float (type Float).\nprint(float(PI())) # 3.14 # 参数不是字符串，也没有实现 __float__ 和 __index__，那么直接执行 PyFloat_FromString\nprint(float(b\"1.414\")) # 1.414 以上是通过类型对象创建，但在底层实际上也是调用了对象的特定类型 APl。 PyObject *\nPyFloat_FromDouble(double); PyObject *\nPyFloat_FromString(PyObject *); PyFloat_FromDouble：基于 C 浮点数创建 Python 浮点数； PyFloat_FromString：基于字符串创建 Python 浮点数； 如果以 e = 2.71 这种方式创建，那么解释器在编译的时候就知道这是一个浮点数，因此会一步到胃，直接调用 PyFloat_FromDouble，然后在该函数内部会根据 C 的浮点数 2.71 创建对应的 PyFloatObject。而通过类型对象调用的话则会有一些额外的开销，因为这种方式最终也会调用相关的特定类型 API，但是在调用之前会干一些别的事情，比如类型检测等等。 所以 e = 2.71 比 float(2.71)、float(\"2.71\") 都要高效。 因此对于内置对象来说，可以调用它的类型对象去创建，这是最通用的逻辑。但这种做法会先兜个圈子，然后再去使用对象的特定类型 API，肯定没有直接使用特定类型 API 的效率高，也就是说 e = 2.71 这种方式是最快的，底层会直接调用 PyFloat_FromDouble。 对于其它对象也是同理，当然大部分情况下我们也都是使用特定类型 API 来创建的。以列表为例，比起 list()，我们更习惯使用［］。 还没结束，浮点数的实际创建过程我们还没有见到，因为最终还是调用特定类型 API 创建的。那么接下来就以 PyFloat_FromDouble 函数为例，看看浮点数在底层的创建过程。 // Objects/floatobject.c // 缓存池（链表）的最大长度，也就是缓存池最多能容纳多少个元素\n#define PyFloat_MAXFREELIST 100\n// 缓存池已经容纳了多少个元素，最多不能超过 PyFloat_MAXFREELIST\nstatic int numfree = 0;\n// 指向缓存池（链表）的头结点，因为缓存池是一个由 PyFloatObject 实例组成的链表\nstatic PyFloatObject *free_list = NULL;\n// 介绍引用计数时说过，引用计数如果为 0，那么对象会被销毁\n// 但是对象所占的内存则不一定释放，而是会缓存起来，浮点数也是如此\n// 销毁浮点数时，会将其放入缓存池中，创建浮点数时，也会优先从缓存池里面获取\n// 而缓存池是使用链表实现的，每一个节点都是一个 PyFloatObject 实例，然后 free_list 指向链表的头节点 PyObject *\nPyFloat_FromDouble(double fval)\n{ // 如果 op 不为 NULL，说明缓存池中有可用对象 PyFloatObject *op = free_list; if (op != NULL) { // 而一旦获取了，那么要维护 free_list，让它指向下一个节点 // 但问题来了，为啥获取下一个节点要通过 Py_TYPE，它不是负责返回 ob_type 吗？ // 相信你已经猜到原因了，因为 ob_type 充当了链表中的 next 指针 // 关于这里的细节，后续介绍缓存池的时候会详细说 free_list = (PyFloatObject *) Py_TYPE(op); // 然后还要将缓存池（链表）的节点个数减 1 numfree--; } else { // 否则说明缓存池里面没有空闲的可用对象，那么要重新申请内存 // PyObject_MALLOC 是基于 malloc 的一个封装，但对内存碎片做了优化 op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } // 走到这里说明内存分配好了，PyFloatObject 也创建了 // 但是不是还少了点啥呢？没错，显然内部的字段还没有初始化 // 还是那句话，内置类型的实例对象该分配多少空间，解释器了如指掌 // 因为通过 PyFloatObject 内部的字段一算就出来了 // 所以虽然对象创建了，但是 ob_refcnt、ob_type、以及 ob_fval 三个字段还没有初始化 // 因此还要将其 ob_refcnt 设置为 1，因为新创建的对象的引用计数是 1 // 以及将 ob_type 设置为指向 PyFloat_Type 的指针，因为它的类型是 float // 而 PyObject_INIT 专们用来设置 ob_refcnt 以及 ob_type，它的源码解释在下面 (void)PyObject_INIT(op, &PyFloat_Type); // 将内部的 ob_fval 字段设置为参数 fval，此时三个字段都已经初始化完毕 op->ob_fval = fval; // 变量是泛型指针 PyObject *，所以还要转成 PyObject * 之后才能返回 return (PyObject *) op;\n} // 补充：PyObject_INIT 的定义如下\n// Include/objimpl.h\n#define PyObject_INIT(op, typeobj) \\ _PyObject_INIT(_PyObject_CAST(op), (typeobj)) static inline PyObject*\n_PyObject_INIT(PyObject *op, PyTypeObject *typeobj)\n{ assert(op != NULL); // 设置实例对象的 ob_type Py_TYPE(op) = typeobj; // 如果 typeobj 是自定义的动态类，那么还要将类型对象的引用计数加 1 // 因为实例对象创建了，意味着类型对象会多一个引用 // 当然这只是针对于动态类，如果 typeobj 是内置的静态类型，那么不做处理 // 因为内置类型超越了引用计数规则，永远不会被析构 if (PyType_GetFlags(typeobj) & Py_TPFLAGS_HEAPTYPE) { Py_INCREF(typeobj); } // 将实例对象的引用计数初始化为 1 _Py_NewReference(op); return op;\n} // Objects/floatobject.c\nvoid\n_Py_NewReference(PyObject *op)\n{ if (_Py_tracemalloc_config.tracing) { _PyTraceMalloc_NewReference(op); } _Py_INC_REFTOTAL; // 初始化为 1 op->ob_refcnt = 1; _Py_AddToAllObjects(op, 1); _Py_INC_TPALLOCS(op);\n} 所以整体流程如下： 为实例对象分配内存空间，空间分配完了对象也就创建了，不过会优先使用缓存池； 初始化实例对象内部的引用计数和类型指针； 初始化 ob_fval 字段为参数 fval； 另外这里又体现了之前说的一个现象，对于自定义的类而言，想要创建实例对象必须要借助于类型对象。但使用特定类型 API 创建浮点数，却压根不需要类型对象 float，而是直接就创建了。创建完之后再让其 ob_type 字段指向 float，将类型和实例关联起来即可。 而之所以能这么做的根本原因就在于，内置类型的实例对象在底层都是静态定义好的，字段已经写死了，所以创建的时候不需要类型对象。解释器知道创建这样的对象需要分配多少内存，所以会直接创建，创建完之后再对内部字段进行初始化，比如设置引用计数和类型。 但对于我们自定义的类而言，想要创建实例对象就必须要借助于类型对象了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么创建的","id":"45","title":"浮点数是怎么创建的"},"46":{"body":"当删除一个变量时，解释器会通过函数 Py_DECREF 来减少该变量指向的对象的引用计数，并判断引用计数减一之后是否为 0，如果为 0 则调用其类型对象的 tp_dealloc 回收该对象。 // Include/object.h\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op)) static inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ // ... if (--op->ob_refcnt != 0) { // ... } else { _Py_Dealloc(op); }\n} // Objects/object.c\nvoid\n_Py_Dealloc(PyObject *op)\n{ destructor dealloc = Py_TYPE(op)->tp_dealloc; // 函数里面有个宏判断，编译展开之后就是下面这一行 (*dealloc)(op);\n} 所以当浮点数被销毁时，会调用 PyFloat_Type 的 tp_dealloc，这是显然的。而 PyFloat_Type 的 tp_dealloc 被初始化为 float_dealloc。 在 float_dealloc 函数内部我们会清晰地看到一个浮点数被销毁的全部过程，关于它的源代码，我们会在介绍缓存池的时候细说。总之到这里我们已经知道了浮点数被销毁的整个流程，下面来画张图描述一下。 以上就是浮点数对象被销毁的流程图，整个过程很简单。 在将对象的引用计数减 1 之后会判断是否为 0，如果为 0，则调用 _Py_Dealloc 销毁对象。而在 _Py_Dealloc 内部会获取对象的类型对象，然后拿到类型对象的 tp_dealloc 字段指向的函数。对于浮点数来说，这个函数就是 float_dealloc。 然后执行 float_dealloc(obj) 将对象销毁，但占用的空间会被缓存起来（取决于是否有缓存池以及缓存池的容量）。 所以整个流程理解起来没有任何难度，里面唯一没有说的就是 float_dealloc，即浮点数的具体销毁过程，这个等介绍缓存池的时候再一起说。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么销毁的","id":"46","title":"浮点数是怎么销毁的"},"47":{"body":"以上就是浮点数在底层的创建和销毁过程，下一篇文章来聊一聊浮点数的缓存池。当一些占用内存较小的对象在被销毁时，不会释放所占的内存，而是缓存起来。等下一次再使用的时候，直接从缓存池中获取，从而避免了频繁申请内存。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 小结","id":"47","title":"小结"},"48":{"body":"浮点数这种对象经常容易被创建和销毁，因为它很简单，使用频率高。如果每次创建都借助操作系统分配内存、每次销毁都借助操作系统回收内存的话，那效率会低到什么程度，可想而知。 因此 Python 解释器在操作系统之上封装了一个内存池，在内存管理的时候会详细介绍，目前可以认为内存池就是解释器预先向操作系统申请的一部分内存，专门用于小对象的快速创建和销毁，从而避免了频繁和操作系统打交道，这便是 Python 的内存池机制。 但浮点数的使用频率很高，并且使用时还会创建和销毁大量的临时对象，举个例子: a = 95.5\nb = 117.3\nc = 108.9 avg = (a + b + c) / 3 计算平均值的时候，会先计算 a + b，创建一个临时对象。接着让临时对象和 c 相加再创建一个临时对象，然后除以 3得到结果。最后销毁临时对象，并将结果交给变量 avg。 尽管我们平常很少注意到这些，但运算背后所产生的对象的创建和销毁的次数，比我们想象的要多。特别是在循环的时候，会伴随大量的对象创建和销毁操作， 如果每次创建和销毁对象都要伴随着内存操作，这个时候即便有内存池机制，效率也是不高的，因为使用内存池虽然可以不经过操作系统，但它也会增加解释器系统的开销。 因此解释器在浮点数对象被销毁后，并不急着回收对象所占用的内存，换句话说其实对象还在，只是将该对象放入一个空闲的链表中。之前我们说对象可以理解为一片内存空间，对象如果被销毁，那么理论上内存空间要归还给操作系统，或者回到内存池中。但 Python 考虑到效率，并没有真正地释放内存，而是将对象放入到链表中，占用的内存还在。 后续如果需要创建新的浮点数对象时，那么从链表中直接取出之前放入的对象（我们认为被回收的对象），然后根据新的浮点数对象重新初始化对应的字段即可，这样就避免了内存分配造成的开销。而这个链表就是我们说的缓存池，当然不光浮点数对象有缓存池，Python 的很多其它对象也有对应的缓存池，比如列表。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 楔子","id":"48","title":"楔子"},"49":{"body":"下面看一下浮点数的缓存池的具体细节。 // Objects/floatobject.c // 缓存池（链表）的最大长度\n// 因此池子里面最多容纳 100 个 PyFloatobject\n#define PyFloat_MAXFREELIST 100 // 缓存池已经容纳了多少个 PyFloatobject\nstatic int numfree = 0;\n// 指向缓存池（链表）的头节点\nstatic PyFloatObject *free_list = NULL; 我们观察一下 free_list，发现它是一个 PyFloatObect *，这就说明缓存池（链表）中的每一个节点都是 PyFloatObject 实例。但以我们刷 Leetcode 的经验，链表里的每个节点应该有一个 next 字段指向下一个节点，可 PyFloatObject 里面似乎并没有这样的字段啊。 相信你已经猜到原因了，因为解释器是使用 ob_type 字段来指向下一个对象。本来 ob_type 指向的应该是 PyFloat_Type，但在缓存池中指向的是下一个 PyFloatObject。 以上就是浮点数的缓存池，说白了就是一个链表，free_list 指向链表的头节点，节点之间通过 ob_type 字段充当 next 指针。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 缓存池的实现细节","id":"49","title":"缓存池的实现细节"},"5":{"body":"Python 的变量只是一个名字，如果站在 C 语言的角度来看，那么就是一个指针。所以 Python 的变量保存的其实是对象的内存地址，或者说指针，而指针指向的内存存储的才是对象。 所以在 Python 中，我们都说变量指向了某个对象。在其它静态语言中，变量相当于是为某块内存起的别名，获取变量等于获取这块内存所存储的值。而 Python 中变量代表的内存所存储的不是对象，而是对象的指针（或者说引用）。 我们举例说明，看一段 C 代码。 #include <stdio.h> void main()\n{ int a = 666; printf(\"address of a = %p\\n\", &a); a = 667; printf(\"address of a = %p\\n\", &a);\n} 编译执行一下： 赋值前后地址都是 0x7fff9eda521c，没有变化，再来看一段 Python 代码。 a = 666\nprint(hex(id(a))) # 0x7febf803a3d0 a = 667\nprint(hex(id(a))) # 0x7fec180677b0 我们看到 Python 里面输出的地址发生了变化，下面分析一下原因。 首先在 C 中，创建一个变量的时候必须规定好类型，比如 int a = 666，那么变量 a 就是 int 类型，以后在所处的作用域中就不可以变了。如果这时候再设置 a = 777，那么等于是把内存中存储的 666 换成 777，a 的地址和类型是不会变化的。 而在 Python 中，a = 666 等于是先开辟一块内存，存储的值为 666，然后让变量 a 指向这片内存，或者说让变量 a 保存这块内存的地址。然后 a = 777 的时候，再开辟一块内存，然后让 a 指向存储 777 的内存，由于是两块不同的内存，所以它们的地址是不一样的。 所以 Python 的变量只是一个和对象关联的名字，它代表的是对象的指针。换句话说 Python 的变量就是个便利贴，可以贴在任何对象上，一旦贴上去了，就代表这个对象被引用了。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量其实是指针","id":"5","title":"变量其实是指针"},"50":{"body":"我们以 PyFloat_FromDouble 这个 API 为例，再回顾一下浮点数的创建, // Objects/floatobject.c PyObject *\nPyFloat_FromDouble(double fval)\n{ // 获取缓存池的头结点指针 PyFloatObject *op = free_list; // 如果 op 不为 NULL，说明它指向了 PyFloatObject // 换句话说就是，缓存池里面有可用节点 if (op != NULL) { // 维护 free_list，让它指向链表的下一个节点 free_list = (PyFloatObject *) Py_TYPE(op); // 缓存池的节点个数减 1 numfree--; } else { op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } (void)PyObject_INIT(op, &PyFloat_Type); op->ob_fval = fval; return (PyObject *) op;\n} 在链表中，ob_type 被用于指向下一个节点，换言之 ob_type 保存的是下一个 PyFloatObject 的地址。不过话虽如此，可 ob_type 的类型仍是 PyTypeObject *。因此在存储的时候，PyFloatObject * 一定是先转成了 PyTypeObject *，之后再交给 ob_type 保存。因为对于指针来说，是可以任意转化的，我们一会儿看 float_dealloc 的时候就知道了。 那么同理，这里的 Py_TYPE(op) 在获取下一个节点的指针之后，还要再转成 PyFloatObject *，然后才能交给 free_list 保存。如果没有下一个对象了，那么 free_list 就是 NULL，在下一次分配的时候，上面的 if (op!=NULL) 就会不成立，从而走下面的 else，使用 PyObject_MALLOC 重新分配内存。 既然对象创建时可以从缓存池获取，那么销毁的时候，肯定要放入到缓存池中。而销毁对象时，会调用类型对象的 tp_dealloc（析构函数），对于浮点数而言就是 float_dealloc，我们看一下源代码。 static void\nfloat_dealloc(PyFloatObject *op)\n{ // 如果要放入浮点数的缓存池，那么它必须是浮点数 if (PyFloat_CheckExact(op)) { // 如果缓存池中的节点个数已经达到了 PyFloat_MAXFREELIST，那么直接释放掉 if (numfree >= PyFloat_MAXFREELIST) { PyObject_FREE(op); return; } // 否则放入到缓存池中 // 缓存池的节点个数加 1 numfree++; // 因为对象要成为链表的新头结点，那么它的 ob_type（充当 next）要指向当前头结点 // 所以将 ob_type 的值设置为 state->free_list 即可 // 但 ob_type 字段的类型为 PyTypeObject *，而 free_list 是 PyFloatobject * // 因此赋值之后，要将类型转换一下 Py_TYPE(op) = (struct _typeobject *)free_list; // 然后将 op 赋值为 state->free_list，也就是让 free_list 指向新的头结点 free_list = op; } // 如果销毁的对象不是浮点数，而是 float 子类的实例，那么直接释放内存 else Py_TYPE(op)->tp_free((PyObject *)op);\n} 以上便是浮点数缓存池的具体实现，说白了缓存池的作用只有一个，就是在对象被销毁的时候不释放所占的内存，下次创建新的对象时能够直接拿来用。因为内存没有被释放，因此创建起来就会快很多。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 再探浮点数的创建与销毁","id":"50","title":"再探浮点数的创建与销毁"},"51":{"body":"下面我们修改解释器源代码，当创建和销毁浮点数的时候，打印一些日志信息。 日志信息以字典的形式打印，里面有三个 key，含义如下： action：如果值为 \"from_freelist\"，表示从缓存池获取对象；如果值为 \"to_freelist\" 表示对象放入缓存池。 numfree：从缓存池获取对象、或将对象放入缓存池之后的元素个数。 address of object：创建或销毁的对象的地址。 当创建 f1 的时候，指向的浮点数会从缓存池中获取，日志信息中的对象地址显然和 Python 里打印的地址是一样的。然后 del f1，会将对象放入缓存池中。最后新建一个变量 f2，显然它指向的浮点数会复用 f1 指向的浮点数的内存。 再举个例子： 我们重新创建变量 f1、f2，并打印对象地址，然后删除 f1、f2 变量，之后再重新创建 f1、f2 变量并打印对象地址，结果发现地址在删除前后正好是相反的。至于原因，如果思考一下将对象放入缓存池、以及从缓存池获取对象时所采取的策略，那么很容易就明白了。 因为 del f1,f2 的时候会先删除 f1，再删除 f2。删除 f1 的时候，会将 f1 指向的对象作为链表中的头结点，然后删除 f2 的时候，会将 f2 指向的对象作为链表中新的头结点，所以之前 f1 指向的对象就变成了链表中的第二个节点。 浮点数缓存池在添加节点的时候，采用的是头插法。 而获取的时候，也会从链表的头部开始获取，所以当重新创建变量 f1 的时候，其指向的对象使用的是之前变量 f2 指向的对象所占的内存，而一旦获取，那么 free_list 指针会指向下一个节点。然后创建变量 f2 的时候，其指向的对象使用的就是之前变量 f1 指向的对象所占的内存。 因此前后打印的地址是相反的，所以我们算是通过实践从另一个角度印证了之前分析的结论。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 侵入 PyFloatObject","id":"51","title":"侵入 PyFloatObject"},"52":{"body":"有时我们想观察底层数据结构的表现行为时，不一定非要修改解释器，因为那样太麻烦，还要重新编译。Python 在上层提供了一种方式，可以让我们通过 Python 的类轻松地模拟 C 的结构体。 from ctypes import * class PyObject(Structure): \"\"\" 继承 ctypes.structure，便可以得到c的结构体 然后通过 fields 指定结构体字段 \"\"\" # _fields_ 是一个列表，内部的元组对应结构体的字段 _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] # ob_refcnt 是 Py_ssize_t 类型，等价于 c_ssize_t # 至于 ob_type，我们就指定 void *，因为暂时不用这个字段 class PyFloatObject(PyObject): \"\"\" 继承 Pyobject，相当于结构体的嵌套 \"\"\" _fields_ = [ (\"ob_fval\", c_double) ] e = 2.71\n# 创建 PyFloatObject 实例，返回它的指针\n# from_address 表示根据对象的地址创建\nf = PyFloatObject.from_address(id(e))\n# 此时 e 和 f 都指向了 2.71 这个浮点数 # 注意接下来会发生神奇的一幕\nprint(e) # 2.71\nprint(hex(id(e))) # 0x1f94d2382f0 # f 等价于底层的 PyFloatObject *，修改 ob_fval 字段\nf.ob_fval = 3.14\nprint(e) # 3.14\nprint(hex(id(e))) # 0x1f94d2382f0 我们看到 id(e) 在前后并没有发生改变，证明 e 指向的始终是同一个对象，但是它的值却变了。咦，不是说浮点数是不可变对象吗？如果想变的话只能创建一个新的浮点数，这样一来前后打印的地址应该会变才对啊。 首先说明结论是没错的，可这是从 Python 的角度而言。如果是从解释器的角度来看的话，没有什么可变不可变，只要我们想让它可变，那么它就是可变的。 另外为了更好地观察底层数据结构的表现，我们后面会经常使用这种方式，而且会介绍更多的骚操作，但是切记这种动态修改解释器的做法不可用于生产环境。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 通过 ctypes 模拟底层数据结构","id":"52","title":"通过 ctypes 模拟底层数据结构"},"53":{"body":"以上就是浮点数的缓存池机制，简单来说是一种空间换时间的做法。 为了避免频繁地和内核打交道，CPython 引入了内存池机制，事先会向操作系统申请一部分内存，然后根据大小划分成不同的单元，按需分配。这样就无需频繁和操作系统的内核打交道了，因为系统调用是代价昂贵的操作。 但有了内存池还不够，我们知道 Python 对象是分配在堆上的，而在堆上分配内存效率要比栈差很多。所以又引入了缓存池，对象在被销毁后不释放所占内存，而是通过一个链表串起来，留着下次备用。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 小结","id":"53","title":"小结"},"54":{"body":"本篇文章来聊一聊浮点数支持的操作，之前说过实例对象的相关操作都定义在类型对象里面，所以我们需要查看 PyFloat_Type。 // Objects/floatobject.c\nPyTypeObject PyFloat_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"float\", sizeof(PyFloatObject), // 浮点数的 __repr__ 方法 (reprfunc)float_repr, /* tp_repr */ // 浮点数作为数值对象拥有的算数操作 &float_as_number, /* tp_as_number */ // ... // 浮点数的哈希操作 (hashfunc)float_hash, /* tp_hash */ // ... // 浮点数支持的比较操作 float_richcompare, /* tp_richcompare */ // ...\n}; 还是之前说的，Python 底层的函数命名以及 API 都是很有规律的，举个例子： tp_repr 字段表示实例对象的字符串格式化，在 PyFloat_Type 里面它被赋值为 float_repr。 tp_hash 字段表示实例对象的哈希操作，在 PyFloat_Type 里面它被赋值为 float_hash。 tp_richcompare 字段表示实例对象的比较操作，所有的比较运算均由该字段负责实现，在 PyFloat_Type 里面它被赋值为 float_richcompare。 下面我们来通过源码看一下底层实现。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 楔子","id":"54","title":"楔子"},"55":{"body":"由于 PyFloat_Type 没有实现 tp_str（字段的值为 0 ），所以打印一个浮点数会执行 tp_repr，它对应的具体实现为 float_repr 函数。 // Objects/floatobject.c static PyObject *\nfloat_repr(PyFloatObject *v)\n{ PyObject *result; // 返回值 char *buf; // 将 Python 浮点数转成 C 的浮点数，然后再转成字符串 buf = PyOS_double_to_string(PyFloat_AS_DOUBLE(v), 'r', 0, Py_DTSF_ADD_DOT_0, NULL); if (!buf) return PyErr_NoMemory(); // 基于 C 字符串创建 Python 字符串 result = _PyUnicode_FromASCII(buf, strlen(buf)); // 释放 buf，然后返回 PyMem_Free(buf); return result;\n} 比较简单，当然具体的转换逻辑由 PyOS_double_to_string 函数负责，内部最终会调用 C 的库函数，感兴趣可以看一下。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的字符串打印","id":"55","title":"浮点数的字符串打印"},"56":{"body":"获取浮点数的哈希值会执行 tp_hash，它对应的具体实现为 float_hash。 // Objects/floatobject.c\nstatic Py_hash_t\nfloat_hash(PyFloatObject *v)\n{ return _Py_HashDouble(v->ob_fval);\n} 具体的哈希计算逻辑由 _Py_HashDouble 负责，通过 v->ob_fval 拿到 C 浮点数，然后传进去计算哈希值。 感兴趣可以看一下具体的哈希值计算逻辑，该函数位于 Python/pyhash.c 中。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的哈希值","id":"56","title":"浮点数的哈希值"},"57":{"body":"浮点数之间的比较操作由 tp_richcompare 字段负责实现，该字段的值为 float_richcompare。 // Include/object.h\n#define Py_LT 0 // 小于\n#define Py_LE 1 // 小于等于\n#define Py_EQ 2 // 等于\n#define Py_NE 3 // 不等于\n#define Py_GT 4 // 大于\n#define Py_GE 5 // 大于等于 // Objects/floatobject.c\nstatic PyObject*\nfloat_richcompare(PyObject *v, PyObject *w, int op)\n{ // 假设在 Python 里面执行了 3.14 == 2.71 // 那么这里的 v 和 w 就会指向 3.14 和 2.71，而 op 就是 Py_EQ double i, j; int r = 0; assert(PyFloat_Check(v)); // 通过 ((PyFloatObject *) v)->ob_fval 拿到具体的 C 浮点数 i = PyFloat_AS_DOUBLE(v); // 变量只是泛型指针 PyObject *，它究竟指向什么类型的对象是需要判断的 // 对于 v == w 来讲，如果能执行该函数，我们只能确保 v 一定指向浮点数，但 w 则不一定 // 所以需要判断，如果 w 的类型是 float 或者 float 的子类，那么转成 C double 并赋值给 j if (PyFloat_Check(w)) // 绝大部分情况都会触发此分支 j = PyFloat_AS_DOUBLE(w); else if (!Py_IS_FINITE(i)) { // ... } else if (PyLong_Check(w)) { // ... } else /* w isn't float or int */ goto Unimplemented; Compare: PyFPE_START_PROTECT(\"richcompare\", return NULL) // 拿到 i 和 j 之后，判断 op 是哪一种操作符，然后执行相应的比较逻辑 switch (op) { case Py_EQ: r = i == j; break; case Py_NE: r = i != j; break; case Py_LE: r = i <= j; break; case Py_GE: r = i >= j; break; case Py_LT: r = i < j; break; case Py_GT: r = i > j; break; } PyFPE_END_PROTECT(r) return PyBool_FromLong(r); Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 该函数的代码量还是有一些大的，但逻辑很好理解，主要是会对 w 做一些类型上的检测。因为 w 不一定是浮点数，比如 3.14 != [] 同样会触发该函数，但函数里的 w 指向的就不是浮点数，而是列表。 不过大部分情况下，两个对象比较的时候，如果符号左侧是浮点数，那么右侧基本也是浮点数。所以基本上都会走开始的 if 分支，然后进入比较逻辑。但如果符号右侧不是浮点数，那么会执行剩下的分支，逻辑会更复杂一些。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的比较操作","id":"57","title":"浮点数的比较操作"},"58":{"body":"最后是重头戏，来看看浮点数是如何运算的。由于加减乘除等算术操作很常见，所以解释器将其抽象成 PyNumberMethods 方法簇。对于数值型对象来说，它的类型对象会实现此方法簇，并由 tp_as_number 字段指向。 // Include/cpython/object.h\ntypedef struct { binaryfunc nb_add; binaryfunc nb_subtract; binaryfunc nb_multiply; binaryfunc nb_remainder; binaryfunc nb_divmod; ternaryfunc nb_power; unaryfunc nb_negative; unaryfunc nb_positive; unaryfunc nb_absolute; inquiry nb_bool; unaryfunc nb_invert; binaryfunc nb_lshift; binaryfunc nb_rshift; binaryfunc nb_and; binaryfunc nb_xor; binaryfunc nb_or; // ...\n} PyNumberMethods; PyNumberMethods 这个结构体在前面已经介绍过，每个字段都是一个函数指针，对应一个算术操作。而根据参数个数的不同，这些函数可以分为多种。 unaryfunc： 一元函数，只接收一个参数，返回 PyObject *； binaryfunc： 二元函数，接收两个参数，返回 PyObject *； ternaryfunc： 三元函数，接收三个参数，返回 PyObject *； inquiry：一元函数，接收一个参数，但返回的是 int。 它们本质上就是解释器基于参数的类型和个数而起的别名，除了以上这些，还有很多其它的别名，具体可以查看 Include/object.h。 由于浮点数是数值型对象，所以 PyFloat_Type 实现了该方法簇，值为 float_as_number，来看一下，它位于 Objects/floatobject.c 中。 像 float_add 负责浮点数的加法运算，float_sub 负责浮点数的减法运算，都比较简单。但我们看到有的函数指针被赋值成了 0，如果为 0 则表示不支持相应操作，比如浮点数不支持位运算。 在 C 语言中，给指针类型的字段赋值为 0 和赋值为 NULL 是等价的。 好，下面我们以加法运算为例，看一下具体实现。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ // 显然两个 Python 浮点数相加，一定是先转成 C 的浮点数，然后再相加 // 加完之后再根据结果创建新的 Python 浮点数 double a,b; // 声明两个 double 变量 // CONVERT_TO_DOUBLE 是一个宏，从名字上也能看出来它的作用 // 将 PyFloatObject 里面的 ob_fval 抽出来，赋值给 double 变量 CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) // 将 a 和 b 相加，然后再重新赋值给 a a = a + b; PyFPE_END_PROTECT(a) // 根据相加后的结果创建新的 PyFloatObject 对象 // 并将其指针转成 PyObject * 之后返回 return PyFloat_FromDouble(a);\n} 以上就是浮点数的加法运算，核心如下： 定义两个 double 变量 a 和 b。 将相加的两个 Python 浮点数维护的值（ob_fval）抽出来，交给 a 和 b。 让 a 和 b 相加，将相加的结果传入 PyFloat_FromDouble 函数中创建新的 PyFloatObject，然后返回其 PyObject *。 另外 float_add 里面还有两个宏我们没有说，分别是：PyFPE_START_PROTECT 和 PyFPE_END_PROTECT，它们是做什么的呢？首先浮点数计算一般都遵循 IEEE-754 标准，如果计算时出现了错误，那么需要将 IEEE-754 异常转换成 Python 异常，而这两个宏就是用来干这件事情的。 所以我们不需要管它，这两个宏定义在 Include/pyfpe.h 中，并且已经在 Python3.9 的时候被移除了。 以上便是浮点数的加法运算，所谓的浮点数在底层就是一个 PyFloatObject 结构体实例。而结构体实例无法直接相加，所以必须先将结构体中维护的值抽出来，对于浮点数而言就是 ob_fval，然后转成 C 的 double 再进行相加。最后根据相加的结果创建新的结构体实例，于是新的 Python 对象便诞生了。 假设 a, b = 1.1, 2.2，那么 c = a + b 的流程如下所示： 但如果是 C 的两个浮点数相加，那么编译之后就是一条简单的机器指令，然而 Python 则需要额外做很多其它工作。并且后续在介绍整数的时候，你会发现 Python 的整数相加更麻烦，但对于 C 而言同样是一条简单的机器码就可以搞定。 所以为什么 Python 会比 C 慢很多倍，从一个简单的加法上面就可以看出来。 以上是浮点数的加法操作，至于减法、乘法、除法等操作也是类似的。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) a = a + b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_sub(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"subtract\", return 0) a = a - b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_mul(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"multiply\", return 0) a = a * b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_div(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); if (b == 0.0) { PyErr_SetString(PyExc_ZeroDivisionError, \"float division by zero\"); return NULL; } PyFPE_START_PROTECT(\"divide\", return 0) a = a / b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} 代码逻辑是类似的，整个过程就是将 Python 浮点数里面的值抽出来，得到 C 浮点数，然后进行运算，再基于运算的结果创建 Python 浮点数，并返回它的泛型指针。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的算数操作","id":"58","title":"浮点数的算数操作"},"59":{"body":"到此浮点数就介绍完了，之所以先介绍浮点数，是因为浮点数最简单。至于整数，其实并没有那么简单，因为它的值在底层是通过数组存储的。而浮点数的值则是用一个 double 类型的字段来维护，会更简单一些，所以我们就先拿浮点数开刀了。 首先我们介绍了浮点数的创建和销毁，创建有两种方式，分别是使用对象的特定类型API 和调用类型对象。前者速度更快，但只适用于内置数据结构，而后者更加通用。 销毁的时候则调用类型对象内部的 tp_dealloc 字段指向的 float_dealloc 函数。当然为了保证效率，避免内存的频繁创建和回收，解释器为浮点数引入了缓存池机制，我们也分析了背后的原理。 最后浮点数还支持数值运算，PyFloat_Type 的 tp_as_number 字段指向了 PyNumberMethods 结构体实例 float_as_number，里面有大量的函数指针，每个指针指向了具体的函数，专门用于浮点数的运算。至于运算的具体逻辑，我们也以加法为例详细介绍了 float_add 函数的实现。核心就是将 Python 对象内部的值抽出来，转成 C 的类型，然后运算，最后再根据运算的结果创建 Python 对象，并返回泛型指针。 关于浮点数，如果你还想知道它的更多内容，可以进入源码中，大肆探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 小结","id":"59","title":"小结"},"6":{"body":"再来看看变量之间的传递，在 Python 中是如何体现的。 a = 666\nprint(hex(id(a))) # 0x1f4e8ca7fb0 b = a\nprint(hex(id(b))) # 0x1f4e8ca7fb0 我们看到打印的地址是一样的，再用一张图解释一下。 a = 666 的时候，先开辟一份内存，再让 a 存储对应内存的地址；然后 b = a 的时候，会把 a 拷贝一份给 b，所以 b 和 a 存储了相同的地址，它们都指向了同一个对象。 因此说 Python 是值传递、或者引用传递都是不准确的，准确的说 Python 是变量的值传递，对象的引用传递。因为 Python 的变量可以认为是 C 的一个指针，在 b = a 的时候，等于把 a 指向的对象的地址（a 本身）拷贝一份给 b，所以对于变量来说是值传递；然后 a 和 b 又都是指向对象的指针，因此对于对象来说是引用传递。 在这个过程中，对象没有重复创建，它只是多了一个引用。 另外还有最关键的一点，Python 的变量是一个指针，当传递变量的时候，传递的是指针；但是在操作变量的时候，会操作变量指向的内存。所以 id(a) 获取的不是 a 的地址，而是 a 指向的内存的地址（在底层其实就是 a 本身）；同理 b = a，是将 a 本身，或者说将 a 存储的、指向某个具体的对象的地址传递给了 b。 另外在 C 的层面，显然 a 和 b 属于指针变量，那么 a 和 b 有没有地址呢？显然是有的，只不过在 Python 中是获取不到的，解释器只允许获取对象的地址。 我们再举个函数的例子： def some_func(num): print(\"address of local num\", hex(id(num))) num = 667 print(\"address of local num\", hex(id(num))) num = 666\nprint(\"address of global num\", hex(id(num)))\nsome_func(num)\n\"\"\"\naddress of global num 0x2356cd698d0\naddress of local num 0x2356cd698d0\naddress of local num 0x2356c457f90\n\"\"\" 函数的参数也是一个变量，所以 some_func(num) 其实就是把全局变量 num 存储的对象的地址拷贝一份给局部变量 num，所以两个 num 指向了同一个对象，打印的地址相同。然后函数内部又执行了 num = 667，相当于让局部变量指向新的对象，或者说保存新对象的地址，因此打印的结果发生变化。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 值传递？引用传递？","id":"6","title":"值传递？引用传递？"},"60":{"body":"本篇文章来聊一聊复数，尽管在日常开发中基本用不到复数，但对它有一个深刻的认识，知道它是做什么的，个人觉得还是很有必要的。另外，本系列力求精致、详细，因此每一个细节都要到位。 那么下面就来解释一下什么是复数。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 楔子","id":"60","title":"楔子"},"61":{"body":"复数是一种用来扩展实数的数，它由实数和虚数两部分组成，用来解决实数范围内无法解决的问题，基本形式如下。 形如 a + bi 的数，我们称之为复数，其中 a 和 b 是浮点数（实数），i 是虚数，满足 i 的平方等于 -1。 所以复数不仅包含实数，还包含虚数，形式为 a + bi，然后 a 被称为复数的实部，b 被称为复数的虚部。如果两个复数的实部相同，虚部相反，那么它们互为共轭复数，比如 1 + 3i 和 1-3i。 如果对复数的实部和虚部进行平方和再开根号，便可得到复数的模，比如 3 + 4i 的模便是 5。 复数的引入可以帮助我们更好地理解和解决许多数学以及物理问题，特别是在涉及振动、波动和电路分析等领域，比如： 电工程：分析交流电路和信号处理； 控制系统：用于系统稳定性分析； 量子力学：描述波函数和量子态； 流体力学：用于描述流动问题； 当然复数也有自己的运算规则。 加法：两个复数相加等于对应的实部和虚部分别相加 减法：两个复数相减等于对应的实部和虚部分别相减 乘法：两个复数的乘法使用分配率 除法：两个复数的乘法涉及到共轭复数 以上就是复数的基本概念，下面来看看 Python 的复数是怎么实现的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 什么是复数","id":"61","title":"什么是复数"},"62":{"body":"复数的实现比想象中要简单很多，说白了就是维护两个浮点数而已。 // Include/complexobject.h\ntypedef struct { double real; double imag;\n} Py_complex; typedef struct { PyObject_HEAD Py_complex cval;\n} PyComplexObject; 我们看到复数的结构和浮点数是非常相似的，只不过浮点数只用一个 double 来维护具体的值。而复数因为存在实部和虚部，因此需要两个 double，其中 real 维护复数的实部，imag 维护复数的虚部。 # 在别的语言中，虚数都是用 i 来表示\n# 而 Python 觉得 i 是一个很常用的变量，所以使用 j 来表示虚数\ncpx = 3 + 4j\n# 其中 3 为实部，4 为虚部\nprint(cpx) # (3+4j)\n# 如果虚部为 1，那么要写成 1j，不能只写 j，否则解释器会认为 j 是一个变量\nprint(3 + 1j) # (3+1j)\n# 复数的实部可以为 0\nprint(2j) # 2j\n# 当然虚部也可以为 0，如果虚部为 0，那么要写成 0j，不能不写\n# 因为 3 和 3+0j 不是等价的，前者是整数，后者是复数\nprint(0j) # 0j\nprint(3 + 0j) # (3+0j) 整个过程非常简单，当解释器看到 3 + 4j 的时候，就知道要创建复数了，因为解释器对内置的数据结构了如指掌，所以在底层会创建一个 PyComplexObject 结构体实例。 没有什么难度，和浮点数是类似的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的底层结构","id":"62","title":"复数的底层结构"},"63":{"body":"类型对象定义的操作，决定了实例对象的行为，所以我们需要查看复数的类型都定义了哪些操作。复数的类型在 Python 里面对应 <class 'complex'>，那么根据解释器的命名规则，它在底层应该由 PyComplex_Type 负责实现。 // Objects/complexobject.c\nPyTypeObject PyComplex_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"complex\", sizeof(PyComplexObject), // ... &complex_as_number, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ // ... complex_richcompare, /* tp_richcompare */ // ... complex_methods, /* tp_methods */ complex_members, /* tp_members */ // ...\n}; complex 的类型也是 type，它的实例对象的大小就是 PyComplexObject 结构体的大小。然后我们看下它的 tp_members，该字段表示实例对象有哪些属性，它被赋值为 complex_members。 它有两个属性，分别是 real 和 imag，类型为 double，并且是只读的。那么在 Python 里面创建复数之后，便可以获取 real 和 imag 属性。 cpx = 3 + 4j\n# 注意：虽然写的是 3 + 4j，但实部和虚部都是浮点数\nprint(cpx.real) # 3.0\nprint(cpx.imag) # 4.0 然后 complex 类型还实现了 tp_richcompare，用于复数之间的比较，但对于复数来说，比较操作只支持等于和不等于。 // Objects/complexobject.c\nstatic PyObject *\ncomplex_richcompare(PyObject *v, PyObject *w, int op)\n{ PyObject *res; // 比较结果 Py_complex i; // 复数的实部和虚部组成的结构体 int equal; // 两个复数是否相等 // 如果 op 不是 ==、也不是 !=，那么报错 // 因为复数只支持这两种比较操作 if (op != Py_EQ && op != Py_NE) { goto Unimplemented; } assert(PyComplex_Check(v)); // 获取复数 v 的 cval 字段，并赋值给 i // 即 i = ((PyComplexObject *) v)->cval TO_COMPLEX(v, i); if (PyLong_Check(w)) { // ... } else if (PyFloat_Check(w)) { // ... } else if (PyComplex_Check(w)) { Py_complex j; // j = ((PyComplexObject *) w)->cval TO_COMPLEX(w, j); // 如果实部和虚部都相等，那么两个复数相等 equal = (i.real == j.real && i.imag == j.imag); } else { goto Unimplemented; } // equal 为 1，表示两个复数相等，为 0 表示两个复数不相等 // 如果 op 为 Py_EQ，那么相等返回 True，不等返回 False // 如果 op 为 Py_NE，那么相等返回 False，不等返回 True if (equal == (op == Py_EQ)) res = Py_True; else res = Py_False; Py_INCREF(res); return res; Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 以上就是复效的比较，核心就是比较对应的实部和虚部是否均相等。 由于复数也属于数值型对象，所以它也实现了 tp_as_number 方法簇。 我们以复数的加法和减法为例，看一下源码细节。 // Objects/complexobject.c // 负责将两个 Py_complex 结构体实例相加\nPy_complex\n_Py_c_sum(Py_complex a, Py_complex b)\n{ // 复数的值由 Py_complex 结构体维护，它里面有 real 和 imag 两个字段 Py_complex r; // 两个 Py_complex 实例相加的时候，等于内部的 real 和 imag 字段分别相加 r.real = a.real + b.real; r.imag = a.imag + b.imag; return r;\n} // 负责将两个 Py_complex 结构体实例相减\nPy_complex\n_Py_c_diff(Py_complex a, Py_complex b)\n{ Py_complex r; r.real = a.real - b.real; r.imag = a.imag - b.imag; return r;\n} // 基于 Py_complex 创建 PyComplexObject\nPyObject *\nPyComplex_FromCComplex(Py_complex cval)\n{ PyComplexObject *op; // 为 PyComplexObject 结构体实例申请内存 // 我们看到内存大小可以直接计算出来，因为内置数据结构在底层是写死的 // 解释器对它们了如指掌，直接通过 sizeof 算一下即可，不需要借助类型对象 op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject)); // 如果 op 为 NULL，表示内存不够，申请失败 if (op == NULL) return PyErr_NoMemory(); // 初始化引用计数，并将 op->ob_type 初始化为 &PyComplex_Type // 也就是让实例对象和类型对象建立联系 (void)PyObject_INIT(op, &PyComplex_Type); // 最后初始化 cval 字段，它是 Py_complex 结构体实例，负责维护复数具体的值 op->cval = cval; // 转成泛型指针 PyObject * 之后返回 return (PyObject *) op;\n} // 复数的加法\nstatic PyObject *\ncomplex_add(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_add\", return 0) // 调用 _Py_c_sum 进行相加，得到新的 Py_complex result = _Py_c_sum(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} // 复数的减法\nstatic PyObject *\ncomplex_sub(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_sub\", return 0) // 调用 _Py_c_diff 进行相减，得到新的 Py_complex result = _Py_c_diff(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} 以上就是复数的加法和减法，比较简单，至于其它操作，感兴趣可以自己阅读一下源码。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的行为","id":"63","title":"复数的行为"},"64":{"body":"本次我们就介绍了复数的底层结构以及它的一些相关操作，总的来说和浮点数是比较像的。不过还是像上面说的那样，对于我们日常开发来说，复数用的并不多，甚至可以说是几乎不用，但通过它来加深对源码的理解以及感受 Python 对象的设计哲学，还是非常有意义的。 下一篇文章来说一说整数，我们知道 Python 整数不会溢出，那么它是怎么设计的呢？背后有什么黑科技呢？我们下一篇文章再聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 小结","id":"64","title":"小结"},"65":{"body":"本篇文章来分析一下 Python 整数的实现原理，我们知道 Python 整数是不会溢出的，换句话说它可以计算无穷大的数。只要你的内存足够，它就能计算，但对于 C 来说显然是不行的，C 能保存的整数范围是有限的。 但问题是，Python 的底层是 C 实现的，那么它是怎么做到整数不溢出的呢？想要知道答案，那么看一下整数在底层是怎么定义的就行了。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 楔子","id":"65","title":"楔子"},"66":{"body":"Python 整数在底层由 PyLongObject 结构体负责承载，看一下它的定义。 // Include/longobject.h\ntypedef struct _longobject PyLongObject; // Include/longintrepr.h\nstruct _longobject { PyObject_VAR_HEAD digit ob_digit[1];\n}; 里面每个字段的含义如下： ob_refcnt：对象的引用计数； ob_type：对象的类型； ob_size：数组 ob_digit 的长度； ob_digit：digit 类型的数组； 别的先不说，就冲里面的 ob_size 我们就可以思考一番。首先 Python 的整数有大小、但应该没有长度的概念吧，那为什么会有一个 ob_size 呢？从结构体字段来看，这个 ob_size 表示数组 ob_digit 的长度，而这个 ob_digit 显然是用来维护具体的值。 相信你已经猜到 Python 整数不会溢出的秘密了，因为它内部通过数组来存储整数，所以能存储无限大的数。因此答案出来了，虽然整数没有我们生活中的那种长度的概念，但它是个变长对象，因为不同的整数占用的内存可能是不一样的。尽管它没有字符串、列表那种长度的概念，或者说无法对整数使用 len 函数，但它是个变长对象。 接下来的重点就是这个 ob_digit 数组，我们要从它的身上挖掘信息，看看整数是怎么放在里面的，不过首先我们要搞清楚这个 digit 是什么类型。 // Include/longintrepr.h\n#if PYLONG_BITS_IN_DIGIT == 30 typedef uint32_t digit;\n#elif PYLONG_BITS_IN_DIGIT == 15 typedef unsigned short digit;\n#else #error \"PYLONG_BITS_IN_DIGIT should be 15 or 30\" PYLONG_BITS_IN_DIGIT 是一个宏，这个宏是做什么的我们先不管，总之如果机器是 64 位的，那么它会被定义为 30，机器是 32 位的，则会被定义为 15。而现在的机器基本都是 64 位的，所以 PYLONG_BITS_IN_DIGIT 等于 30，因此 digit 等价于 uint32_t，即 unsigned int。 因此 ob_digit 是一个无符号 32 位整型数组，至于长度，虽然声明为 1，但其实没有限制，你可以当成任意长度的数组来用，这是 C 语言的一个常见特性。和 Go 不同，C 数组的长度不属于类型信息。至于数组具体多长，取决于存储的整数有多大，显然整数越大，这个数组就越长，占用的空间也就越大。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数的底层结构","id":"66","title":"整数的底层结构"},"67":{"body":"了解了 ob_digit 数组之后，来分析一下它是怎么存储整数的？ 首先抛出一个问题，如果你是 Python 的设计者，要保证整数不会溢出，你会怎么办？我们不妨再把问题简化一下，假设有一个 8 位无符号整数类型，我们知道它能表示的最大数字是 255，但这时候如果要表示 256，该怎么办呢？ 可能有人会想，那用两个数来存储不就好了，一个存储 255，一个存储 1，然后将这两个数放在数组里面。这个答案虽然有些接近，但其实还有偏差：就是我们并不能简单地按照大小拆分，比如 256 拆分成 255 和 1，要是 265 就拆分成 255 和 10，不能这样拆分，而是要通过二进制的方式，也就是用新的整数来模拟更高的位。 如果感到困惑的话没有关系，我们以 Python 整数的底层存储为例，来详细解释一下这个过程。解释器实现整数也是通过我们上面说的这种方式，但考虑的会更加全面一些。 整数 0 注意：当表示的整数为 0 时，ob_digit 数组为空，不存储任何值。而 ob_size 为 0，表示这个整数的值为 0，这是一种特殊情况。 整数 1 整数 -1 我们看到 ob_digit 数组没有变化，但是 ob_size 变成了 -1。没错，整数的正负是通过 ob_size 决定的，ob_digit 存储的其实是绝对值。无论整数 n 是多少，-n 和 n 对应的 ob_digit 是完全一致的，但是 ob_size 则互为相反数。所以 ob_size 除了表示数组的长度之外，还可以表示对应整数的正负。 因此我们之前说整数越大，底层的 ob_digit 数组就越长。更准确地说是绝对值越大，底层数组就越长。所以 Python 在比较两个整数的大小时，会先比较 ob_size，如果 ob_size 不一样则可以直接比较出大小。显然 ob_size 越大，对应的整数越大，不管 ob_size 是正是负，都符合这个结论。 整数 2 ** 30 - 1 如果想表示 2 ** 30 - 1，那么也可以使用一个 digit 表示。话虽如此，但为什么突然说这个数字呢？答案是：虽然 digit 是 4 字节、32 位，但解释器只用 30 个位。 之所以这么做是和加法进位有关系，如果 32 个位全部用来存储其绝对值，那么相加产生进位的时候，可能会溢出。比如 2 ** 32 - 1，此时 32 个位全部占满了，即便它只加上 1，也会溢出。那么为了解决这个问题，就需要先强制转换为 64 位整数再进行运算，从而会影响效率。但如果只用 30 个位的话，那么加法是不会溢出的。 因为 30 个位最大就是 2 ** 30 - 1，即便两个这样的数相加，结果也是 2 ** 31 - 2。而 32 个位最大能表示 2 ** 32 - 1，所以肯定不会溢出的。如果一开始 30 个位就存不下，那么数组中会有两个 digit。 所以虽然将 32 位全部用完，可以只用一个 digit 表示更大的整数，但会面临相加之后一个 digit 存不下的情况，于是只用 30 个位。如果数值大到 30 个位存不下的话，那么就会多使用一个 digit。 这里可能有人发现了，如果使用 31 个位的话，那么相加产生的最大值就是 2 ** 32 - 2，依旧可以使用一个 32 位整型存储啊，那 Python 为啥要牺牲两个位呢？答案是为了乘法运算。 为了方便计算乘法，需要多保留 1 位用于计算溢出。这样当两个整数相乘的时候，可以直接按 digit 计算，并且由于兼顾了\"溢出位\"，可以把结果直接保存在一个寄存器中，以获得最佳性能。 具体细节就不探究了，只需要知道整数在底层是使用 unsigned int 类型的数组来维护具体的值即可，并且虽然该类型的整数有 32 个位，但解释器只用 30 个位。 然后还记得我们在看 digit 类型的时候，说过一个宏吗？PYLONG_BITS_IN_DIGIT，在 64 位机器上等于 30，在 32 位机器上等于 15。相信这个宏表示的是啥你已经清楚了，它代表的就是使用的 digit 的位数。 整数 2 ** 30 问题来了，我们说 digit 只用 30 个位，所以 2 ** 30 - 1 是一个 digit 能存储的最大值。而现在是 2 ** 30，所以数组中就要有两个 digit 了。 我们看到此时就用两个 digit 来存储了，然后数组里面的元素是 0 和 1，而且充当高位的放在后面，因为是使用新的 digit 来模拟更高的位。由于一个 digit 只用 30 位，那么数组中第一个 digit 的最低位就是 1，第二个 digit 的最低位就是 31，第三个 digit 的最低位就是 61，以此类推。 所以如果 ob_digit 为 [a, b, c]，那么对应的整数就等于： 如果 ob_digit 不止 3 个，那么就按照 30 个位往上加，比如 ob_digit 还有第四个元素 d，那么就再加上 d * 2 ** 90 即可。 以上就是 Python 整数的存储奥秘，说白了就是串联多个小整数来表达大整数。并且这些小整数之间的串联方式并不是简单的相加，而是将各自的位组合起来，共同形成一个具有更高位的大整数，比如将两个 32 位整数串联起来，表示 64 位整数。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 探究整数的秘密","id":"67","title":"探究整数的秘密"},"68":{"body":"下面我们再分析一下，一个整数要占用多大的内存。 相信所有人都知道可以使用 sys.getsizeof 计算内存大小，但是这大小到底是怎么来的，估计会一头雾水。因为 Python 中对象的大小，是根据底层的结构体计算出来的。 由于 ob_refcnt、ob_type、ob_size 这三个是整数所必备的，它们都是 8 字节，加起来 24 字节，所以任何一个整数所占内存都至少 24 字节。至于具体占多少，则取决于 ob_digit 里面的元素有多少个。 因此整数所占内存等于 24 + 4 * ob_size的绝对值。 import sys # 如果是 0 的话，ob_digit 数组为空，所以大小就是 24 字节\nprint(sys.getsizeof(0)) # 24 # 如果是 1 的话，ob_digit 数组有一个元素，所以大小是 24 + 4 = 28 字节\nprint(sys.getsizeof(1)) # 28\n# 同理\nprint(sys.getsizeof(2 ** 30 - 1)) # 28 # 一个 digit 只用 30 位，所以最大能表示 2 ** 30 - 1\n# 如果是 2 ** 30，那么就需要两个元素，所以大小是 24 + 4 * 2 = 32 字节\nprint(sys.getsizeof(2 ** 30)) # 32\nprint(sys.getsizeof(2 ** 60 - 1)) # 32 # 如果是两个 digit，那么能表示的最大整数就是 2 ** 60 - 1\n# 因此 2 ** 60 需要三个 digit，所以大小是 24 + 4 * 3 = 36 字节\nprint(sys.getsizeof(1 << 60)) # 36\nprint(sys.getsizeof((1 << 90) - 1)) # 36 print(sys.getsizeof(1 << 90)) # 40 所以整数的大小就是这么计算的，当然不光整数，其它的对象也是如此，计算的都是底层结构体的大小。 另外我们也可以反推一下，如果有一个整数 88888888888，那么它对应的底层数组 ob_digit 有几个元素呢？每个元素的值又是多少呢？下面来分析一波。 import numpy as np # 假设占了 n 个位\n# 由于 n 个位能表达的最大整数是 2 ** n - 1\na = 88888888888\n# 所以只需获取以 2 为底、a + 1 的对数，即可算出 n 的大小\nprint(np.log2(a + 1)) # 36.371284042320475 计算结果表明，如果想要存下这个整数，那么至少需要 37 个位。而 1 个 digit 用 30 个位，很明显需要两个 digit。 # 如果 ob_digit 有两个元素\n# 那么对应的整数就等于 ob_digit[0] + ob_digit[1] * 2 ** 30\na = 88888888888\nprint(a // 2 ** 30) # 82\nprint(a - 82 * 2 ** 30) # 842059320 所以整数 88888888888 在底层对应的 ob_digit 数组为 [842059320, 82]，下面修改解释器，来验证这一结论。 我们看到结果和我们分析的是一样的，但这种办法有点麻烦，我们可以通过之前说的 ctypes 来构造底层的结构体，在 Python 的层面模拟 C 的行为。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 2) ] a = 88888888888\n# 基于对象的地址构造 PyLongObject 对象\nlong_obj = PyLongObject.from_address(id(a))\n# 打印结果和我们预期的一样\nprint(long_obj.ob_digit[0]) # 842059320\nprint(long_obj.ob_digit[1]) # 82 # 如果将 ob_digit[1] 改成 28，那么 a 会变成多少呢？\n# 很简单，算一下就知道了\nlong_obj.ob_digit[1] = 28\nprint(842059320 + 28 * 2 ** 30) # 30906830392\n# 那么 a 会不会也打印这个结果呢？毫无疑问，肯定会的\nprint(a) # 30906830392 # 并且前后 a 保存的地址没有发生改变，因为我们修改的是底层数组\n# 因此所谓的可变和不可变，都只是根据 Python 的表现抽象出来的\n# 或者说，对象是否可变，取决于解释器有没有将修改对象的接口暴露出来\n# 要是解释器没有提供修改对象的接口，那么对象就是不可变的\n# 但如果站在解释器的层面上看，则没啥可变或不可变，一切都由我们决定 通过打印 ob_digit 存储的值，我们验证了得出的结论，原来 Python 是通过数组来存储整数，并且数组的类型虽然是无符号 32 位整数，但是只用 30 个位。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数占的内存大小是怎么计算的","id":"68","title":"整数占的内存大小是怎么计算的"},"69":{"body":"以上我们就探究了 Python 整数的秘密，它是怎么实现的。不过还没有结束，后续还要继续分析小整数对象池，以及整数的行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 小结","id":"69","title":"小结"},"7":{"body":"当提到类型时，这个类型指的是变量的类型还是对象的类型呢？不用想，肯定是对象的类型。因为 Python 的变量是个指针，操作指针会自动操作它指向的内存，所以使用 type(a) 查看的其实是变量 a 指向的对象的类型。 那么问题来了，我们在创建变量的时候，并没有显式地指定类型啊，那么解释器是如何判断一个变量指向什么类型的数据呢？答案是：解释器是通过靠猜的方式，通过赋的值（或者说变量引用的值）来推断类型。 因此在 Python 中，如果你想创建一个变量，那么必须在创建变量的时候同时赋值，否则解释器就不知道这个变量指向的数据是什么类型。所以 Python 是先创建相应的值，这个值在 C 中对应一个结构体，结构体里面有一个字段专门用来记录该值对应的类型，因此在 Python 中，类型是和对象绑定的，而不是和变量。当创建完值之后，再让这个变量指向它，所以 Python 中是先有值后有变量。 但在 C 里面显然不是这样的，因为 C 的变量代表的内存所存储的就是具体的值，所以在 C 里面可以直接声明一个变量的同时不赋值。因为 C 要求声明变量时必须指定类型，所以变量声明之后，其类型和内存大小就已经固定了。 而 Python 的变量存的是个地址，它只是指向了某个对象，所以由于其便利贴的特性，可以贴在任意对象上面。但是不管贴在哪个对象，都必须先有对象才可以，不然变量贴谁去。 另外，尽管 Python 在创建变量的时候不需要指定类型，但 Python 是强类型语言，而且是动态强类型。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量有类型吗？","id":"7","title":"变量有类型吗？"},"70":{"body":"之前分析过浮点数的创建，而整数的创建与之是类似的，都是基于字面量形式的 C 数据创建 Python 数据。 创建浮点数可以使用 PyFloat_FromDouble、PyFloat_FromString 等； 创建整数可以使用 PyLong_FromLong、PyLong_FromDouble、PyLong_FromString 等； 创建整数的这些函数直接去 Objects/longobject.c 里面查看即可，这里就不多说了，我们重点来看一下小整数对象池。 我们知道整数属于不可变对象，运算之后会创建新的对象。 >>> a = 666\n>>> id(a)\n140078521506224\n>>> a += 1\n>>> id(a)\n140078521506096\n>>> 显然这种做法一定存在性能缺陷，因为程序运行时会有大量的对象创建和销毁。根据浮点数的经验，我们猜测 Python 应该也对整数使用了缓存池吧。答案是差不多，只不过不是缓存池，而是小整数对象池。 一些使用频率高的整数在创建之后，会被保存在一个静态数组里面，我们称之为小整数对象池。 看一下小整数对象池的实现。 // Objects/longobject.c #define NSMALLPOSINTS 257\n#define NSMALLNEGINTS 5 static PyLongObject small_ints[NSMALLNEGINTS + NSMALLPOSINTS]; 数组 small_ints 便是小整数对象池，它是一个类型为 PyLongObject、长度为 262 的数组，里面缓存了 -5 到 256 之间的整数。当然这只是解释器的默认行为，因为 -5 到 256 之间的整数使用频率最高，但你也可以根据自身情况修改源码，让它缓存更多的整数，以提升效率，当然这也会额外占用一些内存。 小整数对象池是预先创建好的，里面的整数全局唯一，我们来验证一下。 >>> n1 = 256\n>>> n2 = 256\n>>> id(n1), id(n2)\n(140078528922016, 140078528922016)\n>>> >>> n1 = 257\n>>> n2 = 257\n>>> id(n1), id(n2)\n(140078521507472, 140078521506704)\n>>> 256 位于小整数对象池内，所以全局唯一，需要使用的话直接去取即可，因此它们的地址是一样的。但 257 不在小整数对象池内，所以它们的地址不一样。 另外上面的代码是交互式执行的，但如果有小伙伴不是通过交互式，那么打印地址的时候会得到出乎意料的结果。 a = 257\nb = 257\nprint(id(a) == id(b)) # True 可能有人会好奇，为什么地址又是一样的了，257 明明不在小整数对象池中啊。虽然涉及到了后面的内容，但提前解释一下也是可以的。主要区别就在于一个是交互式执行的，另一个是通过 python3 xxx.py 的方式执行的。 首先 Python 的编译单元是函数，每个函数都有自己的作用域，在这个作用域中出现的所有常量都是唯一的，并且都位于常量池中，由 co_consts 指向。虽然上面的对象不在函数中，而是在全局作用域中，但全局也可以看成是一个函数，它也是一个独立的编译单元。同一个编译单元中，相同的常量只会出现一次。 当执行 a = 257 的时候，会创建 257 这个整数，并放入常量池中。所以 b = 257 的时候就不会再创建了，因为常量池中已经有了，所以会直接从常量池中获取，因此它们的地址是一样的，因为是同一个 PyLongObject。 而对于交互式环境来说，因为输入一行代码就会立即执行一行，所以任何一行可独立执行的代码都是一个独立的编译单元。注意：是可独立执行的代码，比如变量赋值、函数、方法调用等等。但如果是 if、for、while、def 等需要多行表示的逻辑，比如 if 2 > 1:，显然就不是一行可独立执行的代码，它还依赖你输入的下面的内容。 # 此时按下回车，我们看到不再是 >>>，而是 ...\n# 这代表还没有结束，还需要你输入下面的内容\n>>> if 2 > 1:\n... print(\"2 > 1\")\n... # 此时这个 if 语句整体才是一个独立的编译单元\n2 > 1\n>>> 但是像 a = 1、foo()、lst.appned(123) 这些显然是一行可独立执行的代码，因此在交互式中它们是独立的编译单元。 # 此时这行代码已经执行了，它是一个独立的编译单元\n>>> a = 257\n# 这行代码也是独立的编译单元，所以它里面的常量池为空，因此要重新创建 257\n>>> b = 257\n# 由于它们是不同常量池内的整数，所以 id 是不一样的\n>>> id(a), id(b)\n(140078521506768, 140078521506096) 再来看个例子。 >>> a = 666; b = 666\n>>> id(a), id(b)\n(140078521506512, 140078521506512)\n>>>\n>>> a, b = 777, 777\n>>> id(a), id(b)\n(140078521506224, 140078521506224) 666 和 777 明显不在常量池中，为啥 a 和 b 指向对象的地址是一样的呢？相信你能猜到原因，因为上面两种方式无论哪一种，都是在同一行，因此整体会作为一个编译单元。既然是同一个编译单元，那么常量池里面的每个常量只会创建一次，所以地址是一样的。 注意：常量池里面的常量一定在编译期间就可以确定，比如整数、浮点数、字符串等等，解释器在编译期间会静态收集起来，保存在常量池中。但如果编译期间无法确定，就不会静态收集了，举个例子。 >>> a, b = int(\"257\"), int(\"257\")\n>>> id(a), id(b)\n(140078521506768, 140078521506512)\n>>> >>> a, b = int(\"123\"), int(\"123\")\n>>> id(a), id(b)\n(140078528917760, 140078528917760)\n>>> >>> a, b = 258, 258\n>>> id(a), id(b)\n(140078521507632, 140078521507632) int(\"257\") 需要在运行时执行，因此会创建两个 257，然后赋值给 a 和 b，所以地址不一样。 int(\"123\") 虽然也在运行时执行，但解释器创建完之后发现 123 位于小整数对象池中，于是会直接从池子里面取，所以打印的地址一样。注意：int(\"123\") 肯定是会执行的，只是执行之后发现结果存在于小整数对象池中，会再将创建的对象销毁。 258 属于编译期间可以静态收集的常量，会被保存在常量池中，而常量池里的常量只会出现一次，所以打印的地址一样。 ⭐️：常量不仅仅是 123、\"hello\" 这种，像 2 ** 10、\"AAA\" + \"BBB\" 这种也属于常量，它们在编译之后会被替换为 1024、\"AAABBB\"，这个过程被称为常量折叠。 以上就是小整数对象池相关的内容，比较简单，因为小整数对象池就是一个数组，里面缓存了 -5 到 256 之间的 Python 整数，而这些整数可以直接拿来用。 下一篇文章我们来分析整数的运算，这也是最关键的地方。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"17. 解密 Python 的小整数对象池","id":"70","title":"17. 解密 Python 的小整数对象池"},"71":{"body":"通过考察整数的底层实现，我们明白了它能够保证不溢出的缘由。整数的值在底层是由 C 数组来维护的，通过组合多个 digit（uint32_t）来实现大整数的存储。这么做的好处就是 Python 整数没有大小限制了，因此不会溢出，而不会溢出是因为数组没有长度限制，所以只要你的内存足够，就可以存任意大的数。 Python 表示：存不下？会溢出？这都不是事儿，直接继续往数组里面塞 digit 就 ok 了。另外数组存的是绝对值，符号是通过 ob_size 体现的。 不过说实话，用数组实现大整数的做法非常普遍，并没有什么神秘的，就是将多个整数组合起来，模拟具有更高位的大整数。但这种实现方式的难点在于大整数的数学运算，它们才是重点，实现的时候比较考验编程技巧以及思维逻辑。 因此 Python 的整数比浮点数要复杂的多，浮点数在底层直接用 C 的 double 来维护具体的值，因此运算的话，比如相加，直接转成 C 的 double 做加法即可。但整数就不行了，在底层不能简单地将数组相加。 下面来看看具体实现。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 楔子","id":"71","title":"楔子"},"72":{"body":"先来看看整数的大小比较，由于整数具体的值是通过数组维护的，显然数组越长，整数的绝对值就越大，这是毫无疑问的。至于整数的正负，则由 ob_size 来体现。 因此可以得出一个结论：当两个整数在比大小时，可以先比较各自的 ob_size，如果 ob_size 不一样，可以直接比较出大小，并且 ob_size 越大，对应的整数越大。但如果两个整数的 ob_size 一样，那么就从数组 ob_digit 的尾部元素开始，不断向前进行比较。只要两个整数的 ob_digit 中有一个对应元素不相同，那么就可以比较出大小。 之所以从数组的尾部开始，是因为数组元素的索引越大，那么充当的位数就越高，而在比较的时候显然要从高位开始比。 # ob_digit = [892311, 32, 3]\na = 3458764548181171607\n# ob_digit = [2296, 31, 3]\nb = 3458764547106539768 我们以 a 和 b 为例，显然 a 大于 b，那么在底层，它们是如何比较的呢？ 如果 ob_size 不相等，那么可以直接比较出大小。但这里两个整数的 ob_size 是相等的，所以需要比较 ob_digit，并且是从后往前比。具体做法就是让索引从 ob_digit 长度减 1 开始，依次往前遍历。 因为 a->ob_digit[2] 等于 b->ob_digit[2]，此时无法比较出大小，因此索引减一，比较上一个元素。 因为 a->ob_digit[1] 大于 b->ob_digit[1]，所以成功比较出大小，可以得出 |a| 大于 |b|。 当然啦，由于数组反映的是绝对值的大小，所以还需要判断符号。 如果是正数，那么和绝对值相同。 但如果是负数，那么绝对值越大，对应的整数反而越小，因此比较之后的结果还要再乘上 -1。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 3) ] a = 3458764548181171607\nb = 3458764547106539768\nlong_obj1 = PyLongObject.from_address(id(a))\nlong_obj2 = PyLongObject.from_address(id(b))\nprint(list(long_obj1.ob_digit)) # [892311, 32, 3]\nprint(list(long_obj2.ob_digit)) # [2296, 31, 3] 以上就是整数的大小比较逻辑，下面再看一下具体的源码实现。 int 类型对象的 tp_richcompare 字段的值为 long_richcompare，所以具体的比较逻辑便由该函数负责实现。 // Objects/longobject.c static PyObject *\nlong_richcompare(PyObject *self, PyObject *other, int op)\n{ // 比较结果 int result; // 类型检测，确保 self 和 other 的类型都是整数 CHECK_BINOP(self, other); // self 和 other 都是泛型指针 PyObject * // 如果 self == other，说明指针保存的地址相同，它们指向的是同一个对象 // 因此可以直接判定两者相等 if (self == other) result = 0; else // 否则调用 long_compare，将对象维护的 ob_digit 抽出来，挨个比较 // 如果 self > other，那么 result 为 1 // 如果 self == other，那么 result 为 0 // 如果 self < other，那么 result 为 -1 result = long_compare((PyLongObject*)self, (PyLongObject*)other); // 一会儿解释 Py_RETURN_RICHCOMPARE(result, 0, op);\n} 在 Python 中不同的算术操作符会对应不同的魔法方法，而在 C 中均由 long_richcompare 函数实现。 而在 long_richcompare 里面，不管操作符是什么，result 都是固定的。 如果 self > other，那么 result 为 1； 如果 self == other，那么 result 为 0； 如果 self < other，那么 result 为 -1； 不管我们传入的操作符 op 是什么，都不影响上面的结论，因为 result 只是表达了 self 和 other 之间的关系。然后再看一下结尾的 Py_RETURN_RICHCOMPARE 这个宏，它的定义如下。 // Include/object.h\n#define Py_RETURN_RICHCOMPARE(val1, val2, op) \\ do { \\ switch (op) { \\ case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ default: \\ Py_UNREACHABLE(); \\ } \\ } while (0) 这个宏做的事情很简单，就是基于操作符比较 val1 和 val2，如果 if 条件成立，返回 Python 的 True，否则返回 Python 的 False。而在 long_richcompare 里面，最后调用这个宏的时候，给 val1、val2 传的是 result 和 0。注意：这一步稍微有点绕，我们举个例子就简单了。 假设 self = 5，other = 6，我们要判断 self > other 是 True 还是 False。 首先 self 小于 other，因此在 long_richcompare 里面比较之后，result 会等于 -1。那么调用宏的时候，传的三个参数就是 -1、0、Py_GT。然后执行对应分支，发现 val1 > val2 不成立，于是返回 False，因此 self > other 的结果也是 False。 所以 long_richcompare 里面的 result 只是通过 1、0、-1 描述了 self 和 other 之间的关系（C 语言的特点之一），而判断 self > other 最终等价于判断 result > 0，同理其它操作符也是如此。 再举个例子，假设要判断 self <= other，那么最终等价于判断 result <= 0。 如果 self > other，那么 result 就是 1，而 1 <= 0 不成立，所以 self <= other 就是 False。 如果 self == other，那么 result 就是 0，而 0 <= 0 成立，所以 self <= other 就是 True。 如果 self < other，那么 result 就是 -1，而 -1 <= 0 成立，所以 self <= other 就是 True。 因此最后这一步还是很巧妙的，但也稍微有一点绕。估计有人会好奇，为啥不能像浮点数那样直接比较呢？其实原因很好想，因为浮点数在底层使用 double 类型的字段来维护具体的值，比较逻辑非常简单。但整数不同，由于整数的值是通过数组维护的，比较起来非常复杂，如果还按照上面那种做法，那么每个分支里面会存在大量重复代码。 所以整数在比较的时候，先不管指定的操作符是什么，而是先判断两个数的大小关系。如果两个数是大于关系，那么给 result 赋值为 1；等于关系，赋值为 0；小于关系，赋值为 1。 最后将两个整数的比较操作，转成 result 和 0 的比较操作，这个实现思路非常巧妙，你在工作中也可以用起来。 但是还没结束，我们还有最关键的一步没有看。 显然这最关键的一步就在 long_compare 身上，它负责具体的比较逻辑。 // Objects/longobject.c static int\nlong_compare(PyLongObject *a, PyLongObject *b)\n{ Py_ssize_t sign; // 如果两个整数的 ob_size 不一样，那么直接可以比较出大小 if (Py_SIZE(a) != Py_SIZE(b)) { sign = Py_SIZE(a) - Py_SIZE(b); } else { // 否则说明 ob_size 一样，那么获取 ob_size 的绝对值，即数组 ob_digit 的长度 Py_ssize_t i = Py_ABS(Py_SIZE(a)); // 从后往前依次比较数组元素的大小 while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果两个数组的元素全部一样，那么 i 最终会等于 -1 if (i < 0) sign = 0; // 否则说明两个数组中索引为 i 的元素存在不同 else { // 那么比较大小 sign = (sdigit)a->ob_digit[i] - (sdigit)b->ob_digit[i]; // 如果 ob_size < 0，说明是负数，那么比较结果还要再乘上 -1 if (Py_SIZE(a) < 0) sign = -sign; } } // 如果 a < b，那么 sign < 0，直接返回 -1 // 如果 a == b，那么 sign == 0，直接返回 0 // 如果 a > b，那么 sign > 0，直接返回 1 return sign < 0 ? -1 : sign > 0 ? 1 : 0;\n} 以上就是 Python 整数的比较逻辑，所以一个简单的整数比较，Python 底层居然做了这么多工作。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 整数的大小比较","id":"72","title":"整数的大小比较"},"73":{"body":"以上就是整数的比较逻辑，所以用数组实现大整数的思路没什么特别的，但难点就在于运算。而为了方便大家理解和消化，本篇文章暂时只介绍比较操作，下一篇文章来介绍整数的运算。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 小结","id":"73","title":"小结"},"74":{"body":"本篇文章来探讨一下整数的加减法是怎么做的，因为整数在底层采用数组进行存储，所以它的加减法就不像浮点数那么简单。 在介绍浮点数的时候说过，对于数值型对象，它的类型一定实现了 tp_as_number 字段，该字段指向了 PyNumberMethods 结构体实例。结构体里面的每个字段都是一个函数指针，对应数值型对象的一个操作。 比如 nb_add 负责加法操作，nb_substract 负责减法操作等等，本篇文章就来探讨一下。首先整数支持的操作非常多，这里我们只探讨加减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 楔子","id":"74","title":"楔子"},"75":{"body":"整数的加法和减法分别由 long_add 和 long_sub 实现，但运算的核心却不在这两个函数上，它们内部会调用另外两个函数。因为数组保存了整数的绝对值，所以 Python 将整数的运算转成了绝对值运算，而底层有两个函数专门用来做这件事情，分别是 x_add 和 x_sub。 x_add(a, b)：计算 a 和 b 的绝对值之和； x_sub(a, b)：计算 a 和 b 的绝对值之差； 所以整数相加就可以这么做，假设两个整数 a 和 b 相加： 如果 a 和 b 均为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 如果 a 和 b 均为负数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 而整数相减也是同理，还是整数 a 和 b，两者相减： 如果 a 为正数，b 为负数，那么通过 x_add 计算两者的绝对值之和即可； 如果 a 为负数，b 为正数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 和 b 均为正数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果 a 和 b 均为负数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 相加时，符号相同会调用 x_add、符号不同会调用 x_sub。相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 所以这就是 Python 的设计，因为绝对值的加减法不用考虑符号的影响，实现更为简单，所以 Python 将整数运算转化成整数的绝对值运算。那么下面我们的重心就在 x_add 和 x_sub 上面了，看看它们是如何对大整数绝对值进行运算的。到这里你可能会有疑问，大整数运算这么复杂，效率会差吧。显然这是啃腚的，整数数值越大，整数对象的底层数组就越长，运算开销也就越大。 但 Python 底层有一个机制叫做快分支，因为通用逻辑能处理所有情况，那么它的效率必然不高。而快分支则是对那些可以简单运算的情况提前进行处理，比如在对 a 和 b 计算加减法的时候，底层会先判断数组的长度是否均小于等于 1，如果是则说明数组中最多只有一个元素。这样的话，就可以直接转成 C 的整数进行运算了，这样性能损耗就可以忽略不计。 关于快分支，需要再单独解释一下。我们举个生活中的例子：好比你去见女朋友，正常情况下，你需要买花，并且精心打扮。但如果女朋友不在生理期，那么这一切都不需要做，只需买杯奶茶就好了。所以先判断女朋友是否在生理期，如果不在，那么只需买杯奶茶就能牵手便属于快分支。快分支具有命中率高等特点，绝大部分都是这个情况，而一旦命中快分支，那么程序便可快速处理。 回到上面的例子，只要整数不超过 2 ** 30 - 1，都可以走快分支，显然这可以满足绝大部分场景，因为这个数字已经很大了。至于 x_add 和 x_sub 则属于通用逻辑，而通用也意味着平庸，但如果快分支没有命中，那么就只能走通用逻辑了。 而我们的重点就是要研究 x_add 和 x_sub 的实现，感受大整数运算的魅力。不过在介绍之前，不妨想象一下我们平时将两个整数相加的时候是怎么做的。 从最低位开始进行相加，逢十进一，ob_digit 也是同理。我们可以把数组中的每一个元素看成是一个整体，只不过它不再是逢十进一，而是逢 2 ** 30 进一。 # 数组的每个元素最大能表示 2 ** 30 - 1\n# 把元素整体想象成我们生活中加法的个位、十位、百位...\n# 然后对应的位相加，逢 2 ** 30 进一\na = [1024, 22]\nb = [342, 18]\nc = [1024 + 342, 22 + 18] # [1366, 40] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 所以仍旧是对应的位进行相加，和我们生活中的加法并无本质上的区别。只不过生活中的加法，每一位能表示 0~9，逢十进一。而 Python 底层的加法，因为整数使用数组存储，那么每一个位能表示 0 ~ 2 ** 30 - 1，逢 2 ** 30 进一。 把 1024、342 想象成个位，把 22、18 想象成十位，并且此时不再是逢十进一，而是逢 2 ** 30 进一。 a = [2 ** 30 - 1, 16]\nb = [2 ** 30 - 1, 21]\n# a[0] + b[0] 超过了 2 ** 30，要进个 1\n# 而逢十进一之后，该位要减去十\n# 那么逢 2 ** 30 进一之后，显然要减去 2 ** 30\nc = [ a[0] + b[0] - 2 ** 30, a[1] + b[1] + 1\n] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 然后是绝对值减法，和绝对值加法一样，也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，由于 7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 18。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]\n# 所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 然后是 a[1] - b[1]\n# 由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 结果没有问题，以上我们就从原理上介绍了大整数的加减法，下面再看一下源码实现。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法的运算原理","id":"75","title":"整数加减法的运算原理"},"76":{"body":"当整数相加时会执行 long_add 函数，看一下它的具体实现。 // Objects/longobject.c\nstatic PyObject *\nlong_add(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 // 由于 2 ** 30 - 1 已经很大了，所以绝大部分场景，都会执行此分支 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { // MEDIUM_VALUE 是一个宏，接收一个 abs(ob_size) <= 1 的 PyLongObject * // 如果 ob_size 等于 0, 那么返回 0 // 如果 ob_size 等于 1, 那么返回 ob_digit[0] // 如果 ob_size 等于 -1, 那么返回 -ob_digit[0] // 所以计算出 MEDIUM_VALUE(a) + MEDIUM_VALUE(b) 之后 // 将结果转成 PyLongObject，然后返回其泛型指针即可 // 因此当数组中元素个数不超过 1 的时候，显然是可以直接相加的 return PyLong_FromLong(MEDIUM_VALUE(a) + MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| + |b| if (Py_SIZE(b) < 0) { z = x_add(a, b); if (z != NULL) { // 然后对 z 取相反数 assert(Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } // 如果 a 是负数、b 是正数，那么计算 |b| - |a| else z = x_sub(b, a); } else { // 如果 a 是正数、b 是负数，那么计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| + |b| else z = x_add(a, b); } return (PyObject *)z;\n} 因此 long_add 函数并不长，但是调用了 x_add 和 x_sub，显然核心逻辑是在这两个函数里面。至于 long_add 函数，它的逻辑如下： 判断两个整数底层对应的数组的长度是否均小于等于 1，如果是的话那么通过宏 MEDIUM_VALUE 直接将其转成 C 的一个 digit，当然符号也会考虑在内。然后直接相加、返回即可。显然这里走的是快分支，或者说快速通道。 但如果其中一方的数组长度（ob_size）大于 1，那么判断两者的符号。如果都为负数，那么通过 x_add 计算两者的绝对值之和，然后取相反数。 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果都为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 所以 Python 整数设计的非常巧妙，ob_digit 虽然用来维护具体数值，但它并没有考虑正负，整数的正负是通过 ob_size 来表示的。通过将运算变成绝对值运算，实现起来会方便很多。 说完了 long_add，再来看看 long_sub，这两者是类似的。 // Objects/longobject.c\nstatic PyObject *\nlong_sub(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { return PyLong_FromLong(MEDIUM_VALUE(a) - MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是负数、b 是正数，那么先计算 |a| + |b| else z = x_add(a, b); // 然后对 z 取相反数 if (z != NULL) { assert(Py_SIZE(z) == 0 || Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } else { // 如果 a 是正数、b 是负数，那么计算 |a| + |b| if (Py_SIZE(b) < 0) z = x_add(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| - |b| else z = x_sub(a, b); } return (PyObject *)z;\n} 所以 long_add 和 long_sub 的代码是类似的，它们将整数的运算转成了整数的绝对值运算，所以关键要理解什么时候用 x_add，什么时候用 x_sub。 a + b 如果 a 是正数，b 是正数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数、b 是负数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数、b 是正数，调用 x_sub(b, a)，计算 |b| - |a|； 所以相加时，符号相同会调用 x_add、符号不同会调用 x_sub。 a - b 如果 a 是正数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是正数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数，b 是正数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数，b 是负数，调用 x_sub(b, a)，计算 |b| - |a|。当然在源码中调用的是 x_sub(a, b)，计算 |a| - |b|，然后再取相反数； 所以相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 接下来我们的重点就是绝对值加法和绝对值减法的具体实现细节。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法源码实现","id":"76","title":"整数加减法源码实现"},"77":{"body":"函数 x_add 负责绝对值加法，但是介绍之前，需要先了解几个宏，它们在 x_add 中会有体现。 // Include/longintrepr.h\n#define PyLong_SHIFT 30\n#define PyLong_BASE ((digit)1 << PyLong_SHIFT)\n#define PyLong_MASK ((digit)(PyLong_BASE - 1)) 显然 PyLong_BASE 等于 2 ** 30，PyLong_MASK 等于 2 ** 30 - 1（说明 32 个位，前两个位是 0，后三十个位都是 1）。 然后我们可以看 x_add 的具体实现了。 // Objects/longobject.c static PyLongObject *\nx_add(PyLongObject *a, PyLongObject *b)\n{ // 参数 a 和 b 指向了两个要相加的整数对象 // 获取整数在底层的 ob_size Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // 指向两个整数的相加结果 PyLongObject *z; // 循环变量 Py_ssize_t i; // 每个部分的运算结果 digit carry = 0; // 如果 size_a 小于 size_b，说明 |a| < |b| // 那么将两个整数交换位置，确保操作符左边的数大于右边的数 // 这么做也符合人类习惯，可以想象一下小学时候的加法计算 // 如果一个位数多，一个位数少，也会习惯将位数多的放在左边 if (size_a < size_b) { { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 申请一个 ob_digit 的长度为 size_a + 1 的 PyLongObject // 但为什么是 size_a + 1 呢? 由于上面的 if 语句，使得 size_a 一定不小于 size_b // 那么 a 和 b 相加之后的 z 的 ob_size 一定不小于 size_a // 但是也可能比 size_a 多 1，比如: a = 2 ** 60 - 1, b = 1 // 那么相加之后结果为 2 ** 60，于是 ob_size 就变成了 3 // 因此在创建 z 的时候，ob_digit 的容量会等于 size_a + 1 z = _PyLong_New(size_a+1); // 正常情况下, z 是一个 PyLongObject *，但如果 z == NULL, 表示分配失败（程序崩溃） // 但说实话, 除非你内存不够了, 否则这种情况不会发生 if (z == NULL) return NULL; // 重点来了，因为 size_a > size_b，所以会以 size_b 为准，两者从低位向高位依次对应相加 // 当 b 到头了，再单独算 a 的剩余部分 // 因此以 i < size_b 作为条件 for (i = 0; i < size_b; ++i) { // 将 a->ob_digit[i] + b->ob_digit[i] + carry（初始为 0）作为 carry // 如果 carry 没有超过 2 ** 30 - 1，那么它就是 z -> ob_digit[i] 的值 carry += a->ob_digit[i] + b->ob_digit[i]; // 但 carry 是可能溢出的，当溢出时，应该要减去 2 ** 30，所以还要判断是否产生了进位 // 但解释器没有使用常规的判断，而是选择了效率更高的位运算（carry & PyLong_MASK） // 由于 PyLong_MASK 等于 (1 << 30) - 1，所以它的前两个位是 0，后面三十个位全是 1 // 因此当 carry 不超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry // 当 carry 超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry - 2 ** 30 z->ob_digit[i] = carry & PyLong_MASK; // 然后当 carry 产生进位时，显然不可以丢，它们要作用在数组中下一个元素相加的结果上 // 所以这里将 carry 右移 30 位，得到进位，然后重新赋值给 carry，并作用在下一轮循环中 // 如果没有产生进位，那么 carry 为 0，如果产生了进位，那么 carry 为 1 carry >>= PyLong_SHIFT; } // 如果 b 到头了, 那么继续从当前的 i 开始遍历，直到 i == size_a, 逻辑还是和上面一样 for (; i < size_a; ++i) { // 此时只需要加上 a->ob_digit[i] 和 carry 即可，因为 b 到头了 carry += a->ob_digit[i]; // 这里也要按位与 PyLong_MASK, 因为也可能存在进位的情况 // 拿生活中的 99999 + 1 为例，此时 a = 99999, b = 1，显然第一次循环 b 就到头了 // 但后面单独循环 a 的时候, 依旧会产生进位，所以这里也是同理 z->ob_digit[i] = carry & PyLong_MASK; // carry 右移 30 位得到进位，然后重新赋值给 carry carry >>= PyLong_SHIFT; } // 两个循环结束之后, 其实还差一步，还拿 99999 + 1 举例子 // 按照顺序相加得到的是 00000，因为最后还进了一个 1，这里的 carry 也是同理 // 因此 z 的 ob_size 要比 size_a 多 1，目的就在于此 // 所以要将 z->ob_digit 的最后一个元素设置成 carry z->ob_digit[i] = carry; // 但如果最后的 carry 没有进位的话，显然其结果就是 0 // 所以最后没有直接返回 z，而是返回了 long_normalize(z) // 这个 long_normalize 函数的作用是从后往前依次检查 ob_digit 的元素 // 如果为 0，那么就将其 ob_size 减去 1, 直到出现一个不为 0 的元素 // 比如 ob_digit 为 [0, 3, 1, 0, 0, 0]，长度为 6，但规范化之后的 ob_size 显然是 3 // 不过对于当前来说，显然最多只会检查一次，因为它的 ob_size 只比 size_a 多 1 // 所以判断数组最后一个元素是否为 0 也可以，如果为 0 则说明没有产生进位 return long_normalize(z);\n} 整数在底层实现的很巧妙，不理解的话可以多看几遍，然后我们在 Python 的层面上再反推一下绝对值加法，进一步感受底层的运算过程。 # 假设有 a 和 b 两个整数\n# 当然这里是使用列表直接模拟底层数组 ob_digit\na = [1073741744, 999, 765, 123341]\nb = [841, 1073741633, 2332]\n# 然后创建 z，表示 a 和 b 的相加结果\nz = [] # 为了更直观，我们一步步手动相加\n# 首先是 a[0] + b[0]，得到 carry\ncarry = a[0] + b[0]\n# 但 carry 可能大于 2 ** 30 - 1，所以要进行判断\n# 如果大于，那么要减去 2 ** 30，否则保持不变\n# 而这一步可以使用位运算来实现，将 carry 和 (2 ** 30 - 1) 按位与即可\nprint(carry & (2 ** 30 - 1)) # 761\n# 结果是 761，说明 carry 比 2 ** 30 - 1 大\n# 然后 z 的第一个元素就是 761\nz.append(761) # 接着计算 a[1] + b[1] 得到新的 carry\n# 但是之前的 carry 大于 2 ** 30 - 1，所以还要再加上 carry >> 30，即进位\n# 当然，如果没有产生进位，那么 carry >> 30 就是 0\ncarry = (carry >> 30) + a[1] + b[1]\n# 然后 carry & (2 ** 30 - 1) 得到 809，说明 carry 依旧大于 2 ** 30 - 1\nprint(carry & (2 ** 30 - 1)) # 809\n# 所以 z 的第二个元素就是 809\nz.append(809) # 计算 a[2] + b[2] 的时候也是同理\ncarry = (carry >> 30) + a[2] + b[2]\n# 但显然此时的 carry 已经不大于 2 ** 30 - 1 了\nprint(carry & (2 ** 30 - 1)) # 3098\n# 说明 z 的第三个元素是 3098\nz.append(3098) # 此时 b 到头了，所以直接将 a[3] 作为 carry\n# 当然还要判断上一步的 carry 是否大于 2 ** 30 - 1\n# 所以还是右移 30 位，当不大于 2 ** 30 - 1 时，carry >> 30 就是 0\ncarry = (carry >> 30) + a[3]\nprint(carry & (2 ** 30 - 1)) # 123341\nz.append(123341) # 此时 a 也遍历完毕，但是不要忘记再对 carry 进行判断\n# 如果大于 2 ** 30 - 1，那么会产生进位，所以 z 还要再 append 一个 1\n# 当然这里 carry 没有超过 2 ** 30 - 1 # 此时 z 为 [761, 809, 3098, 123341]\nprint(z) # [761, 809, 3098, 123341] # a = [1073741744, 999, 765, 123341]\n# b = [841, 1073741633, 2332]\n# z = [761, 809, 3098, 123341]\n# 因此 ob_digit 为 [1073741744, 999, 765, 123341]\n# 和 ob_digit 为 [841, 1073741633, 2332] 的两个 PyLongObject 相加\n# 得到的新的 PyLongObject 的 ob_digit 为 [761, 809, 3098, 123341]\nprint( a[0] + a[1] * 2 ** 30 + a[2] * 2 ** 60 + a[3] * 2 ** 90 + b[0] + b[1] * 2 ** 30 + b[2] * 2 ** 60 == z[0] + z[1] * 2 ** 30 + z[2] * 2 ** 60 + z[3] * 2 ** 90\n) # True 以上就是绝对值加法，我们从源码的角度和 Python 代码的角度分别解释了一遍。看完了绝对值加法，再来看看绝对值减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值加法：x_add","id":"77","title":"绝对值加法：x_add"},"78":{"body":"和绝对值加法一样，绝对值减法也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 17。 // Objects/longobject.c static PyLongObject *\nx_sub(PyLongObject *a, PyLongObject *b)\n{ // 依旧是获取两者的 ob_size 的绝对值 Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // z 指向相加之后的 PyLongObject PyLongObject *z; // 循环变量 Py_ssize_t i; // 如果 size_a 小于 size_b，那么 sign 就是 -1，否则就是 1 int sign = 1; // 之前 carry 保存相加的结果，这里的 borrow 保存相减的结果 // 名字很形象，相加要进位叫 carry，相减要借位叫 borrow digit borrow = 0; // 接下来依旧要判断两个整数的大小，确保相减的时候，绝对值大的一方在左边 // 相加的时候，大的一方在左边还是在右边，其实没太大影响 // 而相减的时候如果大的一方在左边，显然会省事很多 // 所以如果 size_a 比 size_b 小，说明 a 的绝对值比 b 小 if (size_a < size_b) { // 那么令 sign = -1，因为 a 和 b 交换了位置，所以后续相减之后还要再乘上 sign // 因为计算的是绝对值之差，符号是在绝对值之差计算完毕之后通过 sign 判断的 sign = -1; // 交换 a 和 b 的位置 { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 如果 size_a == size_b，那么需要依次比较 ob_digit 里的元素，才能判断出大小 else if (size_a == size_b) { // 所以从 ob_digit 的尾部开始遍历 i = size_a; while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果所有元素都相等，那么 i 会等于 -1，相减的结果为 0，此时直接返回 0 即可 // 所以这一步也是为了能够快速返回结果，而额外做的一层判断 if (i < 0) return (PyLongObject *)PyLong_FromLong(0); // 但如果某个对应的元素不相等，那么只需判断这两者谁大谁小即可 // 假设 a 的 ob_digit 是 [2, 3, 4, 5]，b 的 ob_digit 是 [1, 2, 4, 5] // 那么上面的 while 循环结束之后，i 会等于 1，显然只需要判断索引为 1 时，对应的值谁大谁小即可 if (a->ob_digit[i] < b->ob_digit[i]) { // 如果 a->ob_digit[i] < b->ob_digit[i]，同样说明 a 小于 b // 那么将 sign 设置为 -1，并交换 a 和 b 的位置 sign = -1; { PyLongObject *temp = a; a = b; b = temp; } } // 因为高位在减法的时候会被抵消掉，所以将 size_a 和 size_b 设置成 i + 1 即可 // 假设两个整数的 ob_digit 分别是 [2, 3, 4, 5] 和 [1, 2, 4, 5] // 因为后两个元素是一样的，所以后续只需要对索引为 [0: i+1] 的部分做差即可 size_a = size_b = i+1; } // a 和 b 相减之后，结果一定不超过 a，因此 ob_digit 的长度一定小于等于 size_a z = _PyLong_New(size_a); if (z == NULL) return NULL; // 然后下面的逻辑和 x_add 是类似的 for (i = 0; i < size_b; ++i) { // 让 a 的 ob_digit[i] 减去 b 的 ob_digit[i] // 当然，由于上一个元素在相减的时候，可能会向当前元素借位，因此还要再减去 borrow // 如果没借位，那么 borrow 是 0，如果借位了，那么 borrow 是 1 // 然后如果当前元素相减的结果也小于 0，那么继续向下一个元素借位 // 但我们似乎没有看到借位的逻辑，这是因为 digit 是无符号 32 位整型，负数会发生环绕 // 假设这里相减得到的是 -100，那么结果就是 2 ** 32 - 100 // 所以存储的负数会变成 \"2 ** 32 + 该负数\"，相当于自动向数组的下一个元素借了一位 // 但 digit 只用 30 个位，所以借一位之后应该加上 2 ** 30，而目前加的是 2 ** 32 borrow = a->ob_digit[i] - b->ob_digit[i] - borrow; // 所以还要和 PyLong_MASK 按位与，只保留后 30 个位的值 // 当然如果没有产生借位，borrow & PyLong_MASK 的结果还是 borrow z->ob_digit[i] = borrow & PyLong_MASK; // 如果借位了，下一轮循环的时候，肯定要多减个 1，但问题是怎么判断有没有借位呢？ // 很简单，如果没有借位，borrow 一定小于 2 ** 30，第 31 个位一定是 0 // 如果借位了，那么 borrow 一定大于 2 ** 30，第 31 个位一定是 1 // 所以让 borrow 右移 30 个位 borrow >>= PyLong_SHIFT; // 然后和 1 按位与，如果产生了借位，borrow 就是 1，否则就是 0 // 等到下一轮循环的时候，再减去 borrow borrow &= 1; /* 所以 Python 底层的整数只用 30 个位真的非常巧妙，尤其是在减法的时候 由于 digit 是 32 位，借位时会加上 2 ** 32 但底层只用 30 个位，所以再和 PyLong_MASK 按位与，只保留后 30 个位 而当前元素如果借位了，那么数组下一个元素要减去 1，但怎么判断它有没有借位呢？ 首先两个不超过 2 ** 30 - 1 的数，相减的结果如果为正（没产生借位） 那么一定也不会超过 2 ** 30 - 1，换句话说其结果对应的第 31 位一定是 0 但如果两个整数相减的结果为负，那么会自动加上 2 ** 32，因此第 31 位一定是 1 所以再让 borrow 右移 30 位，并和 1 按位与 如果结果为 1，证明相减为负数，确实向下一个元素借了 1，因此下一次循环时会多减一个 1 如果结果为 0，那么说明没有借位，下一次循环时相当于多减了一个 0 */ } // 如果 size_a 和 size_b 不相等，那么还需要继续处理 a 的 ob_digit 剩余的元素 for (; i < size_a; ++i) { // 这里的逻辑和之前分析 x_add 是类似的 borrow = a->ob_digit[i] - borrow; z->ob_digit[i] = borrow & PyLong_MASK; borrow >>= PyLong_SHIFT; borrow &= 1; } // 只不过由于不会产生进位，因此不需要再对 borrow 做额外判断 // 而 x_add 中最后还要判断 carry 有没有进位 assert(borrow == 0); // 如果 sign < 0，那么证明是负数，因此还要改变 z 的符号 if (sign < 0) { Py_SIZE(z) = -Py_SIZE(z); } // 最后同样要将 z 规范化，将高位的 0 忽略掉 // 比如 100000 - 99999，结果是 000001，显然只需要保留最低位的 1 即可 // 另外如果相减的结果是小整数，那么直接从池子里获取，否则返回新创建的 return long_normalize(z);\n} 同样的，关于绝对值减法，我们也用 Python 代码演示一遍，感受底层的运算过程。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]，所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 注：源码中加的是 2 ** 32，所以之后还要和 PyLong_MASK 按位与\n# 因此 a[0] + 2 ** 30 - b[0] 等价于 (a[0] + 2 ** 32 - b[0]) & (2 ** 30 - 1) # 然后是 a[1] - b[1]，由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 以上就是绝对值减法，设计的非常巧妙，可以多看几遍，并用列表模拟 ob_digit 数组，然后实际测试一下。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值减法：x_sub","id":"78","title":"绝对值减法：x_sub"},"79":{"body":"关于整数的内容，我们就介绍完了。回顾一下，首先我们剖析了整数的底层实现，了解了它不会溢出的奥秘，然后又介绍了小整数对象池。但也正如之前所说，使用数组实现大整数并不是什么特别新颖的思路，它的难点在于数学运算，这是非常考验编程技巧的地方。 而我们这里只是分析了加减法，至于乘除则更加复杂，这里就不再分析了。关于乘法，解释器采用的是效率更高的 karatsuba 算法，比较有意思，有兴趣可以自己查看一下。 综上所述不难发现 Python 效率低的原因，毕竟一个简单的整数运算都要做这么多工作。当然了，解释器内部也定义了很多快分支，会提前检测能否使用快速通道进行处理，当无法使用快速通道时，再走通用逻辑。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 小结","id":"79","title":"小结"},"8":{"body":"以上我们就聊了聊 Python 的变量和对象，核心就在于：变量保存的不是对象本身，而是对象的内存地址，站在 C 的角度上看变量就是一个指针。 尽管 Python 一切皆对象，但你拿到的都是对象的指针，变量是一个指针，函数是一个指针，元组、列表、字典里面存储的还是指针。我们可以想象一下列表，它底层是基于数组实现的，由于 C 数组要求里面每个元素的类型和大小都相同，因此从这个角度上讲，列表内部存储的只能是指针。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 小结","id":"8","title":"小结"},"80":{"body":"本篇文章来聊一聊布尔值是怎么实现的，在 Python 里面 True 和 False 虽然是关键字，但它们其实也是对象。 下面我们就来详细地解释一下。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 楔子","id":"80","title":"楔子"},"81":{"body":"先来说一下布尔类型本身，我们知道 bool 继承自 int，所以 True 和 False 也具备整数的特征。 print(bool.__base__) # <class 'int'>\nprint(isinstance(True, bool)) # True # True 和 False 可以当成 1 和 0 来用\nprint(True * 2) # 2\nprint(3 // 3 == True) # True\nprint(sum([True, 1, 2])) # 4\nprint(False + 1) # 1 bool 在底层对应 PyBool_Type，因此我们可以肯定地讲，PyBool_Type 的 tp_base 字段的值一定是 &PyLong_Type。 // Objects/boolobject.c\nPyTypeObject PyBool_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bool\", sizeof(struct _longobject), 0, 0, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ bool_repr, /* tp_repr */ &bool_as_number, /* tp_as_number */ // ... &PyLong_Type, /* tp_base */ // ...\n}; bool 继承 int，所以它也实现了 tp_as_number。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔类型","id":"81","title":"布尔类型"},"82":{"body":"既然 bool 继承 int，那么布尔值和整数的底层结构是一样的。 // Objects/boolobject.c // PyLongObject 是 struct _longobject 的类型别名\nstruct _longobject _Py_FalseStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 0) { 0 }\n}; struct _longobject _Py_TrueStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 1) { 1 }\n}; 我们看到布尔值在底层是静态定义好的 PyLongObject 结构体实例，ob_digit 分别为 [0] 和 [1]，所以 False 和 True 完全可以当成 0 和 1 来用。当然啦，由于变量都是 PyObject *，所以这两个结构体实例一般不直接用，而是用底层提供的两个宏。 // Include/boolobject.h /* Use these macros */\n#define Py_False ((PyObject *) &_Py_FalseStruct)\n#define Py_True ((PyObject *) &_Py_TrueStruct) 当返回 Python 的 True 和 False 时，底层会返回 Py_True 和 Py_False，也就是转成 PyObject * 之后再返回。为此解释器还提供了两个宏。 // Include/boolobject.h #define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True\n#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False 当然这些应该比较简单了。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的底层结构","id":"82","title":"布尔值的底层结构"},"83":{"body":"创建布尔值有两种方式，一种是基于 C 整数创建，另一种是将 Python 对象转成布尔值。 基于 C 整数创建，会通过 PyBool_FromLong 函数，显然它是布尔对象的特定类型 API。 // Objects/boolobject.c PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 这个特定类型 API 一般都是解释器内部使用，或者编写扩展的时候使用。而除了这种方式，我们还可以调用 bool 类型，将对象转成布尔值。 // Objects/boolobject.c // 基于 Python 对象创建，比如 bool(obj)\n// 显然会调用 PyBool_Type 的 tp_new，在底层该字段被赋值为 bool_new\ntatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 保存接收的参数，先设置为 False PyObject *x = Py_False; long ok; // bool 类型不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 最多接收 1 个位置参数，解析出来赋值给 x // 如果不传位置参数，那么 x 就是上面设置的 Py_False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 Pyobject_Islrue 判断 x 是真是假 // 如果为真返回 1，否则返回 0 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 将整数转成布尔值 return PyBool_FromLong(ok);\n} 所以核心就在 PyObject_IsTrue 函数里面，看一下它的内部逻辑。 // Objects/object.c\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身是布尔值 True，那么返回 1 if (v == Py_True) return 1; // 如果 v 本身是布尔值 False，那么返回 0 if (v == Py_False) return 0; // 如果 v 是 None，那么返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且它的类型对象定义了 __bool__，那么调用 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且它的类型对象定义了 __len__，那么调用 // 说白了就是基于内部的键值对个数进行判断 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且它的类型对象定义了 __len__，那么调用 // 也就是基于内部的元素个数进行判断 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 否则默认为真，比如我们自定义类的实例 else return 1; // 如果 res 大于 0，返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} 当 PyObject_IsTrue 调用完之后，再基于 PyBool_FromLong 创建布尔值即可，我们用 Python 代码演示一下。 # 不传参数，默认返回 False\nprint(bool()) # False # 整数实现了 __bool__，所以 bool(1) 会调用 int.__bool__(1)\nprint(bool(1)) # True # 字符串实现了 __len__，所以 bool(\"abc\") 会调用 str.__len__(\"abc\")\nprint(bool(\"abc\")) # True class A: pass # 自定义类没有实现 __bool__、__len__\n# 所以在 PyObject_IsTrue 里面最终会走 else 分支，直接为真\nprint(bool(A())) # True # 但如果定义了 __len__，那么是否为真取决于 __len__ 的返回值\n# 并且 __len__ 要定义在类型对象里面，因为 a.__len__() 其实只是语法糖\n# 底层真正执行的是 A.__len__(a)，关于这部分细节后续介绍类的时候会细说\ntype.__setattr__(A, \"__len__\", lambda self: 0)\n# 因为 __len__ 返回的是 0，所以为假，注意：__len__ 要返回整数\nprint(bool(A())) # False # 如果再实现一个 __bool__ 呢？\ntype.__setattr__(A, \"__bool__\", lambda self: True)\n# 我们发现结果又变成了 True，因为 __bool__ 返回的是 True（必须返回布尔值）\n# 并且在源码中，__bool__ 查找的优先级高于 __len__\nprint(bool(A())) # True 现在你是不是对布尔值有一个更深的印象了呢？一个简单的布尔值，居然有这么多可说的。 但是还没结束，我们还要补充一个知识点，先看一段代码。 name = \"satori\" if name: pass if bool(name): pass 这两个 if 判断有啥区别呢？首先 if bool(name) 我们已经分析过了，它会执行 bool_new 函数，将参数解析出来，接着再调用 PyObject_IsTrue，最后得到布尔值。 而对于 if name 来说，它会直接调用 PyObject_IsTrue，后续在分析 if 语句的时候会介绍。所以在工作中，我们使用 if name 即可。 当然啦，获取布尔值除了 bool(obj) 之外，还可以使用 not not obj。 name = \"satori\" print(bool(name)) # True\nprint(not not name) # True 这两者又有什么区别呢？首先 bool(name) 在 Python 里面是一个调用，会进行参数解析，拿到对象之后调用 PyObject_IsTrue 判断真假，正常执行的话，会返回 1 或 0。然后基于 1 和 0 创建布尔值，为 1 返回 True，为 0 返回 False。 而 not name 会对应一条 UNARY_NOT 字节码，它内部也会调用 PyObject_IsTrue，如果结果为 1 返回 False，为 0 返回 True，正好是相反的。所以 not not name 则相当于在 not name 的基础上再反过来一次，这样就和 bool(name) 的结果是一致的了。 当然在工作中，使用哪种都可以，看自己喜好。但为了代码的可读性，显式获取布尔值的时候还是建议使用 bool(name)，效率上没太大差别。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的创建","id":"83","title":"布尔值的创建"},"84":{"body":"以上就是布尔值相关的内容。 bool 继承 int，并且布尔值在底层和整数使用同一个结构体，只是 ob_type 不同； 布尔值具备整数的所有特征，可以像整数一样参与各种运算，其中 True 会被解释成 1，False 会被解释成 0； 布尔值有两种，分别是 True 和 False，它们是单例的，判断时应该使用 is，而不是 ==，除非你把 True 和 False 当成整数使用； 在 Python 里面如果要创建布尔值，有三种方式：通过 True 和 False 字面量、调用类型对象 bool、使用 not not； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 小结","id":"84","title":"小结"},"85":{"body":"None 在 Python 里面也是一个对象，用于表示空（值不存在的情况）。比如基于主键从数据库获取记录，如果没有查询到，那么一般会返回 None。另外如果函数没有返回值，那么也会隐式地返回 None，表示返回的是空。 本篇文章就来聊一聊 None 是怎么实现的。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 楔子","id":"85","title":"楔子"},"86":{"body":"和其它对象不同，由于 None 没有额外的实体数据，所以它在底层就是一个 PyObject 结构体实例。因此也能看出，None 的大小为 16 字节。 // Objects/object.c\nPyObject _Py_NoneStruct = { _PyObject_EXTRA_INIT 1, &_PyNone_Type\n}; None 在底层只包含引用计数和类型，然后类型为 _PyNone_Type。由于变量都是 PyObject *，所以和布尔值一样，解释器也提供了相应的宏，从而方便使用。 // Include/object.h\n#define Py_None (&_Py_NoneStruct) 注意：None 是单例的，如果要判断对象是否为空，应该使用 is 关键字。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的底层结构","id":"86","title":"None 的底层结构"},"87":{"body":"说完了 None 本身，再来看看它的类型。 print(type(None)) # <class 'NoneType'> None 的类型是 <class 'NoneType'>，但这个类解释器没有暴露给我们，需要通过 type 去获取。注意：NoneType 无法被继承，当然我们一般也不会去继承它。 class MyType(type(None)): pass\n\"\"\"\nTypeError: type 'NoneType' is not an acceptable base type\n\"\"\" 然后看一下 NoneType 的底层结构，它位于 Objects/object.c 中。 PyTypeObject _PyNone_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"NoneType\", 0, 0, none_dealloc, /*tp_dealloc*/ /*never called*/ 0, /*tp_vectorcall_offset*/ 0, /*tp_getattr*/ 0, /*tp_setattr*/ 0, /*tp_as_async*/ none_repr, /*tp_repr*/ &none_as_number, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ 0, /*tp_hash */ 0, /*tp_call */ 0, /*tp_str */ 0, /*tp_getattro */ 0, /*tp_setattro */ 0, /*tp_as_buffer */ Py_TPFLAGS_DEFAULT, /*tp_flags */ 0, /*tp_doc */ 0, /*tp_traverse */ 0, /*tp_clear */ 0, /*tp_richcompare */ 0, /*tp_weaklistoffset */ 0, /*tp_iter */ 0, /*tp_iternext */ 0, /*tp_methods */ 0, /*tp_members */ 0, /*tp_getset */ 0, /*tp_base */ 0, /*tp_dict */ 0, /*tp_descr_get */ 0, /*tp_descr_set */ 0, /*tp_dictoffset */ 0, /*tp_init */ 0, /*tp_alloc */ none_new, /*tp_new */\n}; NoneType 的类型也是 type，然后它实现了 tp_as_number。 // Objects/object.c\nstatic PyNumberMethods none_as_number = { // ... (inquiry)none_bool, /* nb_bool */ // ...\n} 但是只实现了里面的 nb_bool，用于生成布尔值。 // Objects/object.c\nstatic int\nnone_bool(PyObject *v)\n{ return 0;\n} 函数返回的是 0，因此调用 PyBool_FromLong 的时候，会返回 Py_False。 print(bool(None)) # False\nprint(not not None) # False","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的类型","id":"87","title":"None 的类型"},"88":{"body":"以上我们就简单介绍了 None，当然内容有些过于简单了，因为 None 本身就没多少内容，核心就两点： None 是单例的； 判断的时候使用 is 关键字； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 小结","id":"88","title":"小结"},"89":{"body":"本篇文章来探讨一下切片是如何实现的，因为在操作字符串、元组、列表等数据结构时，我们经常会使用切片截取数据，所以对切片做一个全方位的了解是很有必要的。 data = list(range(10))\nprint(data[1: 8: 3]) # [1, 4, 7] 以上就是基于切片截取数据，在工作中我们会大量使用切片。但你知道吗，其实切片也是一个对象，类型为 slice，下面我们来看一下切片的底层结构。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 楔子","id":"89","title":"楔子"},"9":{"body":"在程序开发中，我们每时每刻都在创建对象，那到底什么是对象呢？ 其实一个对象就是一片被分配的内存空间，空间可以是连续的，也可以是不连续的。然后空间里面存储了指定的数据，并提供了操作数据的一些功能方法。而按照是否可变和内存大小是否固定，我们可以将对象进行如下分类。 可变对象和不可变对象； 定长对象和变长对象； 下面来详细解释一下。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 楔子","id":"9","title":"楔子"},"90":{"body":"切片的类型是 slice，那么根据解释器的 API 命名规则，我们猜测： 切片（slice 对象）在底层对应 PySliceObject 结构体实例； slice 类型本身在底层对应 PySlice_Type； 下面看一下具体实现。 // Include/sliceobject.h\ntypedef struct { PyObject_HEAD PyObject *start, *stop, *step;\n} PySliceObject; 切片是不可变对象，除了对象的公共头部之外，还有三个字段，分别表示切片的起始位置、终止位置、步长。这也意味着创建切片时，可以给 slice 传递三个参数。 # 创建一个切片\ns = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3) 问题来了，切片创建的时候，传递的参数绑定在了哪些属性上呢？前面我们说过，实例对象可以绑定哪些属性，会定义在类型对象的 tp_members 字段中。 我们看到切片拥有三个属性，名称也是 start、stop、step。 s = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3)\nprint(s.start) # 1\nprint(s.stop) # 8\nprint(s.step) # 3 非常简单，你在 Python 里面看到的一切，都能从源码中找到答案。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的底层结构","id":"90","title":"切片的底层结构"},"91":{"body":"切片是内置类型的实例对象，对于这样的对象，有两种创建方式，相信你已经知道我要说什么了。我们在最开始专门用了十篇文章，从宏观的角度介绍了 Python 的对象模型，目的就在于此。 创建内置对象的两种方式： 通过对象的特定类型 API 创建，只适用于内置对象； 通过调用类型对象创建，所有对象都适用； 解释器对内置对象了如指掌，它们对应的结构体在源码中是写死的，直接 sizeof 一下即可知晓要申请多大内存，完全不需要借助类型对象。 data = list(range(10))\n# 通过特定类型 API 创建\nprint(data[1: 8: 3]) # [1，4，7]\n# 通过调用类型对象创建\nprint(data[slice(1, 8, 3)]) # [1，4，7] 解释器看到 data[1: 8: 3] 就知道要创建一个切片，并且是在数据截取的过程中创建的，我们不能单独写一个 1: 8: 3，这是不符合语法规则的。如果真的想单独创建一个切片，那么需要通过 slice(1, 8, 3) 的方式。 下面通过源码，看一下底层的创建过程。 // Objects/sliceobject.c\nstatic PyObject *\nslice_new(PyTypeObject *type, PyObject *args, PyObject *kw)\n{ PyObject *start, *stop, *step; start = stop = step = NULL; // slice 不接收关键字参数，因此 kw 要指向空字典 if (!_PyArg_NoKeywords(\"slice\", kw)) return NULL; // slice 接收 1 ~ 3 个位置参数，因此 args 指向的元组必须包含 1 ~ 3 个元素 // 然后解析 args，将内部的元素分别赋值给 start、stop、step if (!PyArg_UnpackTuple(args, \"slice\", 1, 3, &start, &stop, &step)) return NULL; // 如果 stop == NULL，说明只传递了一个参数，按照顺序这个参数会赋值给 start // 但很明显，如果只有一个参数，那么这个参数应该交给 stop 保存 // 于是让 stop = start，并让 start = NULL，至于这么做的原因可以想象一下 range // 如果是 range(0, 9)，那么起始位置和终止位置就是 0 和 9 // 但如果是 range(9)，那么这个 9 就是终止位置 if (stop == NULL) { stop = start; start = NULL; } // 假设传了一个参数 8，那么这里就是 PySlice_New(NULL, 8, NULL) // 假设传了两个参数 1、8，那么这里就是 PySlice_New(1, 8, NULL) // 假设传了三个参数 1、8、3，那么这里就是 PySlice_New(1, 8, 3) return PySlice_New(start, stop, step);\n} // 切片缓存，注：slice_cache 只能缓存一个切片\nstatic PySliceObject *slice_cache = NULL; PyObject *\nPySlice_New(PyObject *start, PyObject *stop, PyObject *step)\n{ PySliceObject *obj; // 如果 slice_cache 不为 NULL，证明缓存了切片，那么赋值给 obj // 由于 slice_cache 只能缓存一个切片，那么赋值给 obj 之后，自身要重置为 NULL if (slice_cache != NULL) { obj = slice_cache; slice_cache = NULL; _Py_NewReference((PyObject *)obj); } else { // 否则调用 PyObject_GC_New 为 PySliceObject 实例申请内存 obj = PyObject_GC_New(PySliceObject, &PySlice_Type); if (obj == NULL) return NULL; } // 如果 start、stop、step 是 NULL，那么转成 Python 的 None if (step == NULL) step = Py_None; Py_INCREF(step); if (start == NULL) start = Py_None; Py_INCREF(start); if (stop == NULL) stop = Py_None; Py_INCREF(stop); // 设置切片的 start、stop、step 属性 obj->step = step; obj->start = start; obj->stop = stop; // 接收 GC 跟踪（在之后的篇章中会解释） _PyObject_GC_TRACK(obj); // 转成泛型指针之后返回 return (PyObject *) obj;\n} 以上就是切片的创建过程，非常简单，我们用 Python 代码演示一遍。 print(slice(8)) # slice(None, 8, None)\nprint(slice(1, 8)) # slice(1, 8, None)\nprint(slice(1, 8, 3)) # slice(1, 8, 3) 结果和源码是一致的。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片是怎么创建的","id":"91","title":"切片是怎么创建的"},"92":{"body":"从源码中可以看到，切片是有缓存的。 static PySliceObject *slice_cache = NULL; 这个字段用于缓存被回收的切片，并且从切片的创建过程可以看出只会缓存一个，而不是像浮点数那样以链表的形式缓存多个。之所以这么做，是因为在大部分情况下，切片用完之后会立即销毁。 data = list(range(10))\n# 创建一个切片，截取完数据之后就销毁\nprint(data[0: 3]) # [0, 1, 2]\n# 创建一个切片，截取完数据之后就销毁\nprint(data[2: 7]) # [2, 3, 4, 5, 6] 像 data[start: stop: step] 这种形式，当数据截取完毕之后，创建的切片会立即回收，所以对于解释器来说，它只需要缓存一个切片即可。因此你可以认为同一时刻只会存在一个有效切片，那什么时候会存在多个呢？ data = list(range(10))\ns1 = slice(0, 3)\ns2 = slice(2, 7)\nprint(data[s1]) # [0, 1, 2]\nprint(data[s2]) # [2, 3, 4, 5, 6] 在这种情况下，会同时存在多个有效切片，比如 s1 和 s2 都指向了有效的切片。但很明显，我们在工作中不会这么做，而是在截取数据时，让解释器通过切片的特定类型 API 自动创建。 下面我们来打印切片的地址，看看切片是否被缓存起来了。 # 创建一个切片，缓存如果存在，从缓存获取，否则创建新的切片\n>>> s1 = slice(0, 3)\n>>> id(s1)\n140190801666944 # 创建切片，因为 s1 和 s2 是两个独立的切片，所以它们的地址是不一样的\n>>> s2 = slice(2, 7)\n>>> id(s2)\n140190800965120 # 删除 s1，那么它指向的切片会被放到缓存中\n>>> del s1 # 创建新的切片，使用缓存，显然它的地址和之前 s1 指向的切片的地址是一样的\n>>> s3 = slice(1, 5)\n>>> id(s3)\n140190801666944 # 由于缓存为空，那么删除 s2，它指向的切片会被放入缓存\n>>> del s2 # 创建新的切片，显然它的地址和之前 s2 指向的切片的地址是一样的\n>>> s4 = slice(1, 6)\n>>> id(s4)\n140190800965120 打印结果表明，切片是会被缓存的，但我们怎么证明切片只会缓存一个呢？这个直接看源码即可，根据之前的经验，对象被放入缓存这一步一定发生在对象被销毁的时候，所以我们只需要看切片的销毁过程即可。 对象被销毁时，会调用类型对象的 tp_dealloc，也就是析构函数。 类型对象的 tp_basicsize 保存了实例对象的基础大小，对于切片而言就是 sizeof(PySliceObject)，然后切片又是定长对象，因此 tp_itemsize 是 0。所以切片的大小是固定的，PyObject 占 16 字节，start、end、step 各占 8 字节，总共 40 字节，因此任何一个切片的大小都是固定的 40 字节。 而这个大小即使不借助类型对象也可以计算出来，因为内置对象的定义都是写死的，解释器对它们了如指掌。 为了唤醒大家的记忆，加深理解，以前的内容会时不时回顾一下。我们继续看切片的销毁，对应的析构函数是 slice_dealloc。 // Objects/sliceobject.c\nstatic void\nslice_dealloc(PySliceObject *r)\n{ // 取消 GC 跟踪，相关内容后续介绍 _PyObject_GC_UNTRACK(r); // 切片销毁时，减少 start、stop、step 指向对象的引用计数 Py_DECREF(r->step); Py_DECREF(r->start); Py_DECREF(r->stop); // 关键来了，如果 slice_cache 为 NULL，证明没有缓存 // 那么让 slice_cache 保存销毁的切片的指针，而切片的内存不释放 // 这样下一次创建切片时就不需要申请内存了，直接使用缓存即可 // 因为没有申请内存，只是初始化了 start、stop、step 三个字段，所以效率会更高 if (slice_cache == NULL) slice_cache = r; // 否则释放切片所占的内存 else PyObject_GC_Del(r);\n} 从源码中可以看到，如果 slice_cache 不为空，说明已经缓存了一个切片，if 条件不成立，于是会选择释放内存，所以切片只会缓存一个。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的缓存","id":"92","title":"切片的缓存"},"93":{"body":"切片接收 1 到 3 个元素，但我们可能只传一个，那么剩余的属性是怎么初始化的呢？举个例子： >>> data = list(range(10))\n>>> data[: 5]\n[0, 1, 2, 3, 4]\n>>> data[1:]\n[1, 2, 3, 4, 5, 6, 7, 8, 9]\n>>> data[1:: 2]\n[1, 3, 5, 7, 9]\n>>> data[:: 2]\n[0, 2, 4, 6, 8]\n>>> data[:]\n[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 这些切片都是合法的，当参数不足时，它们的 start、end、step 是怎么设置的呢？ // Objects/sliceobject.c // 该函数接收指向切片的指针，以及三个整型指针\n// 会将切片的起始位置、终止位置、步长解析出来，赋值给 *start、*stop、*step\n// 所以该函数会在其它函数的内部被调用，先声明 Py_ssize_t start, stop, step\n// 然后将切片指针、&start、&stop、&end 传递给 PySlice_Unpack 进行调用\n// 当该函数执行完毕时，外部就拿到了切片的起始位置、终止位置以及步长\nint\nPySlice_Unpack(PyObject *_r, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)\n{ // 将 PyObject * 转成 PySliceObject * PySliceObject *r = (PySliceObject*)_r; Py_BUILD_ASSERT(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX); // 判断步长，如果解析出的步长为空，那么将 *step 赋值为 1 // 所以当不指定步长时，步长会被设置为 1，因此 data[::] 等价于 data[:: 1] if (r->step == Py_None) { *step = 1; } else { // 如果步长不为空，那么它应该是整数，或者是实现了 __index__ 的类的实例对象 // 但如果步长的类型不合法，那么 _PyEval_SliceIndex 里面会设置异常 // 合法的话，会将 r->step 赋值给 *step if (!_PyEval_SliceIndex(r->step, step)) return -1; // 步长不能为 0，否则设置 ValueError(\"slice step cannot be zero\") if (*step == 0) { PyErr_SetString(PyExc_ValueError, \"slice step cannot be zero\"); return -1; } // 如果步长小于 -PY_SSIZE_T_MAX，那么设置为 -PY_SSIZE_T_MAX // 显然这一步基本不会发生 if (*step < -PY_SSIZE_T_MAX) *step = -PY_SSIZE_T_MAX; } // 检测起始位置，如果为 None // 当步长大于 0 时，将 *start 设置为 0 // 当步长小于 0 时，将 *start 设置为 int64 最大值，这背后的原理一会儿解释 if (r->start == Py_None) { *start = *step < 0 ? PY_SSIZE_T_MAX : 0; } // 说明起始位置不为 None else { // 如果起始位置的类型不合法，那么设置异常，直接返回，否则赋值给 *start if (!_PyEval_SliceIndex(r->start, start)) return -1; } // 如果终止位置为 None // 当步长大于 0 时，将 *stop 设置为 PY_SSIZE_T_MAX，即 int64 最大值 // 当步长小于 0 时，将 *stop 设置为 PY_SSIZE_T_MIN，即 int64 最小值 if (r->stop == Py_None) { *stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX; } // 说明终止位置不为 None else { // 如果终止位置不合法，那么设置异常，直接返回，否则赋值给 *stop if (!_PyEval_SliceIndex(r->stop, stop)) return -1; } return 0;\n} 代码逻辑有一些绕，虽然我们知道它在做什么，但问题是这么做的意义是什么呢？在解释之前，我们先用 Python 代码将该函数所做的事情再描述一遍，这样更容易理解。 PY_SSIZE_T_MAX = 2 ** 63 - 1\nPY_SSIZE_T_MIN = -2 ** 63 # 如果切片同时包含起始位置、终止位置、步长，会直接赋值给 start、end、step\n# 这种情况最简单，就不赘述了，我们来讨论未被同时指定的情况 # 步长为空，比如 data[1: 8]\nstart = 1\nend = 8\nstep = 1 # 起始位置为空，步长大于 0，比如 data[: 8]\nstart = 0\nend = 8\nstep = 1\n# 起始位置为空，步长小于 0，比如 data[: 8: -1]\nstart = PY_SSIZE_T_MAX\nend = 8\nstep = -1 # 终止位置为空，步长大于 0，比如 data[2:]\nstart = 2\nend = PY_SSIZE_T_MAX\nstep = 1\n# 终止位置为空，步长小于 0，比如 data[2:: -1]\nstart = 2\nend = PY_SSIZE_T_MIN\nstep = -1 # 起始位置、终止位置均为空，步长大于 0，比如 data[::]\nstart = 0\nend = PY_SSIZE_T_MAX\nstep = 1\n# 起始位置、终止位置均为空，步长小于 0，比如 data[:: -1]\nstart = PY_SSIZE_T_MAX\nend = PY_SSIZE_T_MIN\nstep = -1 下面来分析一下它为什么要这么做，首先我们要知道，所谓的切片截取数据，本质上就是一层 for 循环。 def slice_data(data: list, start: int, end: int, step: int) -> list: ret_data = [] assert step != 0 if step > 0: while start < end and start < len(data): ret_data.append(data[start]) start += step else: while start > end and start >= 0: ret_data.append(data[start]) start -= step * -1 return ret_data data = list(range(0, 10))\nprint(data[: 5])\nprint(slice_data(data, 0, 5, 1))\n\"\"\"\n[0, 1, 2, 3, 4]\n[0, 1, 2, 3, 4]\n\"\"\"\nprint(data[8: 3: -1])\nprint(slice_data(data, 8, 3, -1))\n\"\"\"\n[8, 7, 6, 5, 4]\n[8, 7, 6, 5, 4]\n\"\"\" 所以当步长大于 0 时，从左往右遍历，当步长小于 0 时，从右往左遍历。最后我们再画两张图，看完之后你就彻底理解了。 当步长大于 0 时： 步长大于 0 时，从左往右遍历。 如果 start 未指定，那么设置为 0，表示从头截取，这很好理解，但问题是 end 应该设置为多少。由于 PySlice_Unpack 相当于只是做了一步预处理，它并不包含截取的原始数据的信息，所以 end 如果不指定，直接设置为 int64 最大值。 当步长小于 0 时： 当步长小于 0 时，从右往左遍历。 因为不知道截取的原始数据有多长，所以如果 start 未指定，那么设置为 int64 最大值。但不管是从左往右还是从右往左，end 都是不包含的，所以当 end 为空时，不能指定为 0，否则索引为 0 的元素就取不到了。当然也不能设置为 -1，因为 -1 会被当成是合法的负数索引，后续截取数据时会被解释为最后一个元素的索引，所以它被设置成了 int64 最小值。 我们以使用切片截取列表为例，后续介绍列表的时候还会详细说： 代码中的 item 指向切片，截取数据之前要先获取它内部的 start、stop、step 属性，于是创建三个 Py_ssize_t 变量，并将指针作为参数，调用 PySlice_Unpack。当调用结束后，就拿到了切片的起始位置、终止位置、步长。 但还没有结束，我们说 PySlice_Unpack 只是对切片里面的值做了一些预处理，比如当 step 为 1 并且 end 没有指定时，那么 end 会被设置为 PY_SSIZE_T_MAX。 所以它下面又调用了函数 PySlice_AdjustIndices，会将截取的原始数据的长度也传进去，然后对 start、end、step 做进一步处理，所有的序列对象在基于切片截取数据时都会有这两步。我们看一下该函数的逻辑。 // Objects/sliceobject.c\nPy_ssize_t\nPySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)\n{ // 参数 length：截取的原始数据的长度 // 参数 start、stop：指向起始位置和终止位置的指针 // 参数 step：步长 assert(step != 0); assert(step >= -PY_SSIZE_T_MAX); // 如果起始位置小于 0 if (*start < 0) { // 那么加上长度，得到正数索引，因为负数索引就是个语法糖 *start += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *start < 0 时， 直接将 *start 设置为 0，最终会从第一个元素开始往后遍历 如果 step < 0，表示从后往前遍历，因此当 *start < 0 时， 显然遍历不到任何元素，因为索引是大于 0 的，所以直接将 *start 设置为 -1 */ if (*start < 0) { *start = (step < 0) ? -1 : 0; } } // 如果起始位置大于等于长度，继续判断步长 else if (*start >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *start >= length 时， 显然遍历不到任何元素，因为最大索引为 length - 1 所以直接将 *start 设置为 length 如果 step < 0，表示从后往前遍历，因此当 *start >= length 时， 直接将 *start 设置为 length - 1，最终会从最后一个元素往前遍历 */ *start = (step < 0) ? length - 1 : length; } // 如果终止位置小于 0 if (*stop < 0) { // 那么加上长度，得到正数索引 *stop += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *stop < 0 时， 显然遍历不到任何元素，因此直接将 *stop 设置为 0 如果 step < 0，表示从后往前遍历，因此当 *stop < 0 时， 直接将 *stop 设置为 -1，最终会从后往前遍历到头 */ if (*stop < 0) { *stop = (step < 0) ? -1 : 0; } } // 如果终止位置大于等于长度，继续判断步长 else if (*stop >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *stop >= length 时， 直接设置为 length，会从 start 往后遍历到头 如果 step < 0，表示从后往前遍历，因此当 *stop >= length 时， 此时遍历不到任何元素，直接设置为 length - 1 */ *stop = (step < 0) ? length - 1 : length; } // 到这里 *start、*stop 就已经转换好了 // 或者说 PY_SSIZE_T_MIN、PY_SSIZE_T_MAX 已经基于 length 被替换掉了 // 然后计算 *start 和 *stop 之间的距离，也就是应该要遍历多少个元素 if (step < 0) { if (*stop < *start) { return (*start - *stop - 1) / (-step) + 1; } } else { if (*start < *stop) { return (*stop - *start - 1) / step + 1; } } // 如果不符合条件的话，比如像 data[3: 8: -1]，显然遍历不到任何元素 // 那么直接返回 0 return 0;\n} 可以看到，哪有什么岁月静好，我们之所以能够通过各种姿势使用切片，全靠解释器在替我们负重前行，它在背后做了非常多的工作。正如前面提到的，C 是一门很单纯的语言，Python 的花里胡哨的操作回归到 C 里面，就是普通的 if else 以及 while、for。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片属性的初始化","id":"93","title":"切片属性的初始化"},"94":{"body":"以上我们就介绍了切片的底层结构，切片也是一个对象，拥有自己的缓存。并且 Python 针对切片提供的语法也非常丰富： data[:: 1]，从左往右遍历，或者说从前往后遍历； data[:: -1]，从右往左遍历； data[:: 2]，只筛选索引为偶数的元素； 起始位置和终止位置可以为负数，会自动转成正数； 所以切片用起来很方便，但要明白这背后都是因为解释器做了大量的工作。当然大部分情况下我们使用切片都是无感知的，一般不会刻意地想着要去创建一个切片，只是字符串、列表、元组等数据都支持通过切片截取数据，所以切片还是值得我们深入了解一下的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 小结","id":"94","title":"小结"},"95":{"body":"本篇文章来聊一聊 bytes 对象，也就是字节串，而说到字节串就不得不提字符串。 字符串是由任意数量的字符组成的序列，用于表示文本数据。在大多数编程语言中，字符串被视为一种高层数据类型，能够处理和操作文本信息。 字节串是由任意数量的字节组成的序列，用于表示二进制数据。 字符串具有特定的字符编码，比如 UTF-8、ASCII 等等，这些编码定义了字符如何在内存中表示。而字节串没有预定义的编码，它只是原始的二进制序列，在处理非文本数据时非常有用。 计算机在存储数据以及通过网络传输数据时，数据格式都是二进制字节串，所以如果你想传输一段文本，那么必须先将它转成字节串。 name = \"古明地觉\" print(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\"\nprint(name.encode(\"utf-16\"))\n\"\"\"\nb'\\xff\\xfe\\xe4S\\x0ef0W\\xc9\\x89'\n\"\"\"\nprint(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\" 字节串传输之后还需要转成文本数据，这个过程叫做反序列化。但由于字节串不保存编码信息，它只是一坨字节流，因此反序列化时还需要知道指定的编码，如果编码指定错误，那么反序列化会失败。 # name_utf8 和 name_gbk 都只是普通的字节串\nname_utf8 = b'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\nname_gbk = b'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5' # 如果反序列化，必须要知道原始文本使用的编码是什么\nprint(name_utf8.decode(\"utf-8\"))\nprint(name_gbk.decode(\"gbk\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 如果指定了错误的编码，那么反序列化会失败\ntry: name_utf8.decode(\"gbk\")\nexcept UnicodeDecodeError as e: print(e)\n\"\"\"\n'gbk' codec can't decode byte 0xa7 in position 10: illegal multibyte sequence\n\"\"\" 另外我们看到字符串只有 4 个字符，但序列化之后的字节串却明显多于 4 个字节。这是因为一个字节最多能表示 256 个字符，对于英文字符来说已经足够了，但对于非英文字符则力不从心，毕竟光普通的中文字符就好几千个。 所以便有了多字节编码，它使用多个字节来表示一个字符，具体使用多少个，则取决于编码。如果是 GBK 编码，那么两个字节表示一个字符，如果是 UTF-8 编码，那么三个字节表示一个字符，当然这里的字符指的是非英文字符。所以在反序列化的时候，需要指定正确的编码，否则解析一定会失败。 以上就是关于 bytes 对象的一些基础概念，下面来看一下它的底层结构。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 楔子","id":"95","title":"楔子"},"96":{"body":"字节串的类型是 bytes，那么我们有理由相信它在底层由 PyBytesObject 结构体表示。 // Include/bytesobject.h\ntypedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 我们看一下里面的字段： PyObject_VAR_HEAD：变长对象的公共头部，因为字节串是由若干个字节组成的，具有长度的概念，所以它是变长对象。 ob_shash：保存字节串的哈希值，因为计算哈希值需要遍历所有的字节，如果每获取一次哈希值都要重新计算的话，性能会有影响。所以第一次计算之后会用 ob_shash 字段保存起来，之后就不再计算了。如果 bytes 对象的哈希值尚未计算，那么 ob_shash 为 -1。 ob_sval：char 类型的数组，负责保存具体的字节。这个和整数的 ob_digit 字段的声明方式类似，由于数组长度不属于类型的一部分，因此虽然声明的时候长度是 1，但其实长度不受限制，具体是多少取决于 bytes 对象的字节数量。 我们创建几个不同的 bytes 对象，然后通过画图感受一下。 val = b\"\" 我们看到即便是空的字节序列，底层的 ob_sval 也需要一个 '\\0'，那么这个结构体实例占多大内存呢？首先 ob_sval 之外的四个成员，每个都占 8 字节，而 ob_sval 是一个 char 类型的数组，一个 char 占 1 字节，所以 bytes 对象的内存大小等于 32 + ob_sval 的长度。 而 ob_sval 里面至少有一个 '\\0'，因此一个空的字节序列需要占 33 字节的内存。 >>> sys.getsizeof(b\"\")\n33 注意：ob_size 统计的是 ob_sval 中有效字节的个数，不包括 '\\0'，但是计算占用内存的时候，显然是需要考虑在内的，因为它确实占用了一个字节的空间。因此我们说 bytes 对象占的内存等于 33 + ob_size 也是可以的。 val = b\"abc\" 显然内存大小等于 32 + 4 = 36 字节。 因此 bytes 对象的底层结构还是很好理解的，因为它是字节序列，所以在底层用一个 char 类型的数组来维护具体的值再合适不过了。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 字节串的底层结构","id":"96","title":"字节串的底层结构"},"97":{"body":"下面来看一下 bytes 对象的创建方式，这里我们暂时先不介绍底层是如何创建的，等到介绍缓存池的时候再说。这里来聊一聊如何在 Python 中创建，虽然该系列是剖析源码，但是光说底层的话可能会有一些无趣，因此这个过程中也会穿插大量的 Python 内容。 先观察 Python 代码执行时的表现，再通过底层的源码进行解析，两者结合起来更容易让人理解。另外该系列也能保证即使你没有相应的 C 语言基础，也一样能收获很多。 b = b\"hello\" 以上是最简单的创建方式，它使用我们之前说的特定类型 API，但通过这种方式创建的字节串只能包含 ASCII 字符。下面这种方式是不行的： b = b\"古明地觉\" \"古明地觉\" 包含非 ASCII 字符，所以采用多字节编码，但编码方式也有多种，比如 UTF-8、GBK 等等，解释器不知道你用的是哪一种。因此采用字面量的方式，只能包含 ASCII 字符，因为对于 ASCII 字符而言，不管使用哪种编码，得到的结果都是一样的。但如果包含非 ASCII 字符，那么必须手动指定编码。 b = bytes(\"古明地觉\", encoding=\"utf-8\")\nprint(b)\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 里面的 \\x 表示十六进制，我们知道字符 a 的 ASCII 码是 97，对应十六进制是 61。同理字符 b 是 62，字符 c 是 63，那么 b\"abc\" 就还可以这么创建。 b = b\"\\x61\\x62\\x63\"\nprint(b)\n\"\"\"\nb'abc'\n\"\"\" 以上是根据十六进制的数字创建 bytes 对象，注意：采用这种方式创建必须指定 \\x，然后 b\"\\x61\" 表示的是 1 个字节，并且该字节对应的 ASCII 码的十六进制是 61，也就是字符 a。而 b\"61\" 表示的是两个字节。 # \\x61、\\x62、\\x63 均表示 1 字节\nprint(b\"\\x61\\x62\\x63\")\n\"\"\"\nb'abc'\n\"\"\"\n# 下面这个创建的 bytes 对象是 6 字节\nprint(b\"616263\")\n\"\"\"\nb'616263'\n\"\"\" 可如果有一串字符也是十六进制格式，但开头没有 \\x，这个时候要怎么转成 bytes 对象呢？很简单，使用 bytes.fromhex 方法即可。 print(bytes.fromhex(\"616263\"))\n\"\"\"\nb'abc'\n\"\"\" # 转成 bytes 对象之后，如果是可打印字符的话\n# 那么会显示对应的字符，比如 abc\n# 如果是不可打印字符，就原本输出，比如 \\xff\nprint(bytes.fromhex(\"616263FF\"))\n\"\"\"\nb'abc\\xff'\n\"\"\" 该方法会将里面的字符串当成十六进制来解析，得到 bytes 对象。并且使用这种方式的话，字符的个数一定是偶数，每个字符的范围均是 0~9、A~F（或者 a~f）。因为十六进制需要两个字符来表示，范围是 00 到 FF。即便小于 16，也必须用两个字符表示，比如我们可以写 05，但绝不能只写个 5。 总之使用 bytes.fromhex 创建时，字符串的长度一定是一个偶数，从前往后每两个分为一组。使用字面量的方式创建时也是如此，比如我们可以写成 b\"\\x01\\x02\"，但不能写成 b\"\\x1\\x2\"。 # 不可以写成 b\"\\x0\"，会报错\nprint(b\"\\x00\") # b'\\x00' # \\x 后面至少跟两个字符，但这里跟了 3 个字符\n# 所以 \\x 会和 61 组合得到 'a'\n# 至于后面的那个 1 就单纯的表示字符 '1'\nprint(b\"\\x611\") # b'a1' 所以 \\x 后面可以跟超过两个以上的字符，超过两个以上的部分会被当成普通字符来处理，与十六进制无关。每个 \\x 只和它后面的两个字符结合，因此 \\x 后面不能少于两个字符。 然后我们通过索引获取的时候，得到的也是一个整数： b = \"古\".encode(\"utf-8\")\nprint(b) # b'\\xe5\\x8f\\xa4'\nprint([b[0], b[1], b[2]]) # [229, 143, 164] 所以 bytes 对象的每个字节都是 0 ~ 255 之间的一个整数，那么问题来了，如果我有每个字节对应的整数，那么如何再转成 bytes 对象呢？ # 里面的每个整数都必须位于 0 ~ 255 之间\nprint(bytes([229, 143, 164]))\nprint(bytes([229, 143, 164, 97, 98, 99]))\n\"\"\"\nb'\\xe5\\x8f\\xa4'\nb'\\xe5\\x8f\\xa4abc'\n\"\"\" print(bytes([229, 143, 164]).decode(\"utf-8\"))\nprint(bytes([229, 143, 164, 97, 98, 99]).decode(\"utf-8\"))\n\"\"\"\n古\n古abc\n\"\"\" 以上就是 bytes 对象的几种创建方式，我们再总结一下。 # 1）通过字面量的方式创建\nprint(b\"hello\") # b'hello'\n# 也可以使用十六进制的 ASCII 码，但要指定 \\x 前缀\n# \\x 会和它后面的两个数字（范围是 0 ~ 9、A ~ F）进行组合，表示一个字符\nprint(b\"\\x61\\x62\\x63\") # b'abc'\n# 除了十六进制之外，还可以使用八进制的 ASCII 码，前缀是 \\\n# \\ 会和它后面的三个数字（范围是 0 ~ 7）进行组合，表示一个字符\n# 97、98、99 对应的八进制为 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Python 编写，然后放在 Lib 目录下面。 Modules 目录 Python 的内置库，这些库都是用 C 编写的，编译之后会内嵌在解释器里面。我们举个例子： import random, _random\nimport re, _sre\nimport io, _io\nimport ast, _ast 以 random 为例，它是用来生成随机数的，和性能密切相关。所以它的核心功能由 C 编写，编译之后内嵌在解释器里，模块名为 _random。只不过 Python 又封装了一个 random，在内部会导入 _random，像 re 和 _sre、asyncio 和 _asyncio 都是类似的关系。 Modules 目录里面实现了大量和性能相关的模块，比如 sys、time、gc 等等，我们后续再聊。 Objects 目录 包含 Python 内置数据结构的底层实现，像字典、列表、元组、函数等，底层实现都定义在 Objects 目录中。 Parser 目录 负责 Python 代码的编译，虽然 Python 是解释型语言，但也是要经过编译的。编译的结果为 PyCodeObject 对象，它里面包含了要执行的字节码，编译完之后会交给虚拟机执行。 所以 Python 解释器 = Python 编译器 + Python 虚拟机。 Python 目录 Python 虚拟机的具体实现，字节码的执行、执行环境的管理等都在里面。 Mac 目录 用于 Mac OS X 平台的特定工具和脚本。 Misc 目录 包含各种杂项文件，如配置脚本、工具等。 PC 目录 专为 Windows 平台编写的配置文件和特定扩展。 PCbuild 目录 用于在 Windows 上编译 Python 的项目文件。 Programs 目录 包含 Python 其它可执行文件（如 IDLE）的源代码。 Tools 目录 包含用 Python 编写的各种脚本和工具，帮助开发和维护 Python。 以上就是 CPython 的源码结构，对它有一个基本的认识有助于我们后续的源码学习。","breadcrumbs":"1. CPython 源码长什么样子？ » CPython 源码结构","id":"1","title":"CPython 源码结构"},"10":{"body":"不可变对象一旦创建，其内存中存储的值就不可以再修改了。如果想修改，只能创建一个新的对象，然后让变量指向新的对象，所以前后的地址会发生改变。而可变对象在创建之后，其存储的值可以动态修改。 像整数就是一个不可变对象。 >>> a = 666\n>>> id(a)\n140176818069136\n>>> a += 1\n>>> id(a)\n140176818068368 我们看到执行 a += 1 操作之后，前后地址发生了变化，所以整数不支持本地修改，因此是一个不可变对象； 原来 a = 666，而我们说操作一个变量等于操作这个变量指向的内存，所以 a += 1 会将 a 指向的整数对象 666 和 1 进行加法运算，得到 667。因此会开辟新的空间来存储 667，然后让 a 指向这片新的空间。至于原来的 666 所占的空间怎么办，解释器会看它的引用计数，如果不为 0 代表还有变量引用（指向）它，如果为 0 则证明没有变量引用了，所以会被回收。 关于引用计数，我们后面会详细说，目前只需要知道，如果对象被变量引用了，那么该对象的引用计数就会加 1。有几个变量引用，那么它的引用计数就是几。 除了整数之外，浮点数、字符串、布尔值等等，都是不可变对象，它们的值不能本地修改。 然后是可变对象，像列表、字典、集合等都是可变对象，它们支持动态修改。 这里先多提一句，Python 对象本质上就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。Python 的任何对象在 C 中都会对应一个结构体，这个结构体除了存放具体的值之外，还存放了一些额外信息，具体细节在后续剖析内置对象的时候会细说。 在上一篇文章中我们说到，列表、元组、集合这些容器的内部存储的不是具体的对象，而是对象的指针。比如：lst = [1, 2, 3]，你以为列表存储的是三个整数对象吗？其实不是的，它存储的是三个整数对象的指针，当我们获取 lst[0] 的时候，拿到的是一个指针，但是操作（比如 print）的时候会自动操作指针指向的内存。 因为 Python 底层是用 C 实现的，所以列表的实现必然要借助 C 的数组。可 C 数组里面的元素的类型是一致的，但列表却可以存放任意的元素，因此从这个角度上讲，列表里面的元素就不可能是对象，因为不同的对象在底层对应的结构体是不同的，所以元素只能是指针。 可能有人又好奇了，不同对象的指针也是不同的啊，是的，但 C 指针是可以转化的。Python 底层将所有对象的指针，都转成了 PyObject 类型的指针，这样不就是同一种类型的指针了吗？关于这个 PyObject，它是我们后面要剖析的重中之重，贯穿了整个系列。不过目前只需要知道列表（还有其它容器）存储的元素、以及 Python 的变量，它们都是一个泛型指针 PyObject *。 >>> lst = [1, 2, 3]\n>>> id(lst)\n140176818170432\n>>> lst.append(4)\n>>> lst.append(5)\n>>> lst\n[1, 2, 3, 4, 5]\n>>> id(lst)\n140176818170432 我们看到列表在添加元素的时候，前后地址并没有改变。列表在 C 中是通过 PyListObject 结构体实现的，我们在介绍列表的时候会细说。这个 PyListObject 内部除了一些基本信息之外，还维护了一个 PyObject 的二级指针，指向了 PyObject * 类型的数组的首元素。 显然图中的指针数组用来存储具体的对象的指针，每一个指针都指向了相应的对象（这里是整数对象）。 然后我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了一个二级指针。显然添加、删除、修改元素等操作，都是通过这个二级指针来间接操作指针数组。 因为一个对象一旦被创建（任何语言都是如此），那么它在内存中的大小就不可以变了。所以这就意味着那些可以容纳可变长度数据的可变对象，要在内部维护一个指针，指针指向一片内存区域，该区域存放具体的数据。如果空间不够了，那就申请一片更大的内存区域，然后将元素依次拷贝过去，再让指针指向新的内存区域。而列表的底层也是这么做的，其内部并没有直接存储具体的指针数组，而是存储了指向指针数组首元素的二级指针。 那么问题来了，为什么要这么做？ 其实很好理解，遵循这样的规则可以使通过指针维护对象的工作变得非常简单。一旦允许对象的大小可在运行期改变，那么我们就要考虑如下场景。 在内存中有对象 A，并且其后面紧跟着对象 B。如果在运行的某个时候，A 的大小增大了，这就意味着必须将 A 整个移动到内存中的其他位置，否则 A 增大的部分会覆盖掉原本属于 B 的数据。但要将 A 移动到内存的其他位置，那么所有指向 A 的指针就必须立即得到更新。可想而知这样的工作是多么的繁琐，因此通过在可变对象的内部维护一个指针就变得简单多了。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 可变对象和不可变对象","id":"10","title":"可变对象和不可变对象"},"100":{"body":"根据解释器 API 的命名规则，bytes 类型在底层应该对应 PyBytes_Type。 // Objects/bytesobject.c\nPyTypeObject PyBytes_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bytes\", PyBytesObject_SIZE, sizeof(char), // ... &bytes_as_number, /* tp_as_number */ &bytes_as_sequence, /* tp_as_sequence */ &bytes_as_mapping, /* tp_as_mapping */ // ...\n}; 实例对象的大小信息保存在类型对象中，由 tp_basicsize 和 tp_itemsize 负责维护。 tp_basicsize：实例对象的基本大小，对于 bytes 对象来说就是 PyBytesObject_SIZE。 tp_itemsize：如果实例对象是变长对象，并且结构体本身还保存了具体的元素，那么该字段则表示每个元素的大小，否则为 0。对于 bytes 对象来说就是 sizeof(char)，即 1 字节。 其中 PyBytesObject_SIZE 是一个宏，等于 offsetof(PyBytesObject, ob_sval) + 1，也就是结构体的起始位置到 ob_sval 字段的偏移量再加 1。显然这个大小是固定不变的基础大小，那么它等于多少呢？ typedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 很明显，大小是 32 + 1 = 33 字节，然后再加上 sizeof(char) * ob_size 就是整个 bytes 对象的大小。由于 sizeof(char) 等于 1，所以 bytes 对象的大小等于 PyBytesObject_SIZE 加上 ob_size，我们后面介绍 bytes 对象的创建时会看到。 然后看一下方法簇，我们发现这三个方法簇 bytes 对象居然都支持。 // Objects/bytesobject.c static PyNumberMethods bytes_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ bytes_mod, /*nb_remainder*/\n}; static PySequenceMethods bytes_as_sequence = { // 计算长度，如 len(b\"abc\") (lenfunc)bytes_length, /*sq_length*/ // 将两个 bytes 对象相加 // 比如 b\"abc\" + b\"def\" (binaryfunc)bytes_concat, /*sq_concat*/ // 将 bytes 对象重复 N 次 // 比如 \"abc\" * 3 (ssizeargfunc)bytes_repeat, /*sq_repeat*/ // 基于索引获取 bytes 对象的指定元素 // 比如 b\"abc\"[1] (ssizeargfunc)bytes_item, /*sq_item*/ 0, /*sq_slice*/ 0, /*sq_ass_item*/ 0, /*sq_ass_slice*/ // 判断 bytes 对象是否包含某个元素 (objobjproc)bytes_contains /*sq_contains*/\n}; static PyMappingMethods bytes_as_mapping = { // 获取 bytes 对象的长度 (lenfunc)bytes_length, // 基于切片截取 bytes 对象 (binaryfunc)bytes_subscript, 0,\n}; 对于数值型操作，bytes 对象实现了 nb_remainder，它居然支持求余数，这是怎么回事？好吧，我表现的有些刻意了，其实就是一个字节串的格式化操作。 对于序列型操作，bytes 对象支持五个，从名字上看也知道是做什么的，不过这些我们一会儿都会说。 对于映射型操作，bytes 对象支持两个。虽然 bytes 对象不是字典，但解释器允许它做一些类似于映射的操作，这种设计使得 bytes 对象具有更加丰富和灵活的操作接口。 下面我们就来详细介绍这些操作的底层实现，它们都位于 Objects/bytesobject.c 中。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 类型","id":"100","title":"bytes 类型"},"101":{"body":"bytes 对象借用取模运算符 % 实现格式化，它对应 bytes_as_number->nb_remainder 字段，该字段被赋值为 bytes_mod。 static PyObject *\nbytes_mod(PyObject *self, PyObject *arg)\n{ if (!PyBytes_Check(self)) { Py_RETURN_NOTIMPLEMENTED; } // PyBytes_AS_STRING 会返回 PyBytesObject 的 ob_sval 字段 // PyBytes_GET_SIZE 会返回 PyBytesObject 的 ob_size 字段，即长度 // arg 是传递的参数，它是一个元组 return _PyBytes_FormatEx(PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self), arg, 0);\n} 最终会调用 _PyBytes_FormatEx 进行格式化，我们再以 Python 为例。 info = b\"name: %s, age: %d\"\nprint(info % (b\"satori\", 17)) # b'name: satori, age: 17' bytes 对象的格式化，在工作中其实用的不多。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 对象的格式化","id":"101","title":"bytes 对象的格式化"},"102":{"body":"计算字节串的长度会执行 bytes_as_sequence->sq_length，该字段被赋值为 bytes_length。 static Py_ssize_t\nbytes_length(PyBytesObject *a)\n{ return Py_SIZE(a);\n} Py_SIZE 是一个宏，我们之前说过，它会返回对象的 ob_size。 name = b\"satori\"\n# 直接返回 ob_size\nprint(len(name)) # 6 ob_size 维护了 bytes 对象的有效字节个数，计算长度的时候直接返回。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 计算 bytes 对象的长度","id":"102","title":"计算 bytes 对象的长度"},"103":{"body":"bytes 对象支持乘法操作，可以重复指定次数，举个例子。 word = b\"abc\"\n# 重复 3 次\nprint(word * 3) # b'abcabcabc' 我们看到这里使用了乘法运算符，所以很容易联想到 PyNumberMethods 的 nb_mul，但对于 bytes 对象而言却不是这样，它对应的是 PySequenceMethods 的 sq_repeat。所以 Python 的同一个操作符，在底层会对应不同的函数，比如 long_mul 和 float_mul、以及这里的 bytes_repeat，在 Python 的层面都是 * 这个操作符。 下面我们看一下具体逻辑，它由 bytes_repeat 函数实现。 static PyObject *\nbytes_repeat(PyBytesObject *a, Py_ssize_t n)\n{ Py_ssize_t i; Py_ssize_t j; Py_ssize_t size; // 新创建的 bytes 对象的 ob_size PyBytesObject *op; // 指向新创建的 bytes 对象 size_t nbytes; // 应该为 bytes 对象内部的 char 数组（ob_sval）申请多大内存 // 如果 bytes 对象乘上一个小于 0 的数，那么等价于乘以 0 if (n < 0) n = 0; // Py_SIZE(a) * n 就是新创建的 bytes 对象的长度 // 如果这个长度超过了 PY_SSIZE_T_MAX，那么报错，字节串过长 // 另外注意这里的条件，正常思路是 Py_SIZE(a) * n > PY_SSIZE_T_MAX // 但为了避免 Py_SIZE(a) * n 发生溢出，所以改成了除法 // 这个和我们写二分查找求平均值是一个道理 if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) { PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 将 Py_SIZE(a) * n 赋值给 size size = Py_SIZE(a) * n; // 如果 size 和 Py_SIZE(a) 相等，说明 n 为 1，或者 Py_SIZE(a) 为 0 // 但不管哪一种，都意味着新创建的 bytes 对象和原始的 bytes 对象是相同的 // 既然这样的话，就没必要创建了，直接给原始的 bytes 对象的引用计数加一，然后返回即可 if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) { Py_INCREF(a); return (PyObject *)a; } // 需要为内部的 char 数组申请的内存大小，一个元素一个字节 // 注：严格意义上说，nbytes 应该等于 char 数组的内存大小减 1 // 因为额外存储 '\\0' 所需的一字节被算在了 PyBytesObject_SIZE 里面 // 所以这个 nbytes 的含义其实和 bytes 对象的长度是等价的 nbytes = (size_t)size; // PyBytesObject_SIZE + nbytes 便是 bytes 对象的内存大小了 // 但如果两者相加的结果反而小于等于 nbytes，说明产生溢出了（发生了环绕） if (nbytes + PyBytesObject_SIZE <= nbytes) { // 那么报错，字节串太长了 PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 为新创建的 bytes 对象申请 PyBytesObject_SIZE + nbytes 大小的内存 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + nbytes); // 如果 op 为 NULL，说明内存不足 if (op == NULL) return PyErr_NoMemory(); // 初始化，将 op->ob_type 设置为 &PyBytes_Type，将 op->ob_size 设置为 size (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); // 将 ob_shash 初始化为 -1，等到需要计算的时候，再更新 ob_shash // 一旦更新，后续就不用再计算了，会直接返回 ob_shash op->ob_shash = -1; // ob_sval 要额外存储一个 '\\0'，显然它位于索引为 size 的位置 // 因此有效字符的数量为 size，但 ob_sval 的大小为 size + 1 // 那么问题来了，既然这样的话，nbytes 应该等于 size + 1 才对，为啥等于 size 呢 // 很简单，原因已经说过了，因为 PyBytesObject_SIZE 为 offsetof(PyBytesObject, ob_sval) + 1 // offsetof(PyBytesObject, ob_sval) 表示从结构体起始位置到 ob_sval 的偏移量 // 或者你也可以理解为 ob_sval 之前的所有字段的大小 // 但它又额外加上了 1，所以 '\\0' 需要的空间已经被申请了，因此没有问题 op->ob_sval[size] = '\\0'; // 此时对象的内存就已经申请好了，类型、长度等元数据也设置好了，接下来就是拷贝元素了 // 首先做一个快分支判断，如果原始的 bytes 对象的长度为 1，证明新的 bytes 对象的所有字节都是一样的 // 直接将 op->ob_sval 里面的 n 个元素设置为 a->ob_sval[0] 即可 if (Py_SIZE(a) == 1 && n > 0) { memset(op->ob_sval, a->ob_sval[0] , n); return (PyObject *) op; } // 否则将 a->ob_sval 里面除了 '\\0' 之外的有效字符拷贝到 op->ob_sval 里面 // 每次拷贝 Py_SIZE(a) 个字符，直到拷贝的字符个数达到 size i = 0; if (i < size) { memcpy(op->ob_sval, a->ob_sval, Py_SIZE(a)); i = Py_SIZE(a); } while (i < size) { j = (i <= size-i) ? i : size-i; memcpy(op->ob_sval+i, op->ob_sval, j); i += j; } // 将 PyBytesObject * 类型的 op 转成 PyObject *，然后返回，交给变量保存 return (PyObject *) op;\n} 所以通过观察源码，你会发现 Python 里面的操作并没有什么神奇的，简单思考一下就知道它的底层逻辑。再比如后续介绍的切片截取，即使现在还没看具体源码，但也能猜到底层就是单纯的 for 循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 将 bytes 对象重复 N 次","id":"103","title":"将 bytes 对象重复 N 次"},"104":{"body":"bytes 对象也支持通过索引和切片截取指定部分的元素。 buf = b\"abcde\"\n# 基于索引获取元素，拿到的是整数\nprint(buf[0]) # 97\n# 基于切片获取元素，拿到的依旧是字节串\nprint(buf[0: 1]) # b'a' 那么底层是怎么做的呢？ static PyObject*\nbytes_subscript(PyBytesObject* self, PyObject* item)\n{ // 如果是 buf[0] 这种，那么 self 就是 buf，item 就是 0 // 如果是 buf[0: 3] 这种，那么 self 就是 buf，item 就是 slice(0, 3) // 所以要对 item 进行检测，判断它到底是索引还是切片 if (PyIndex_Check(item)) { // 如果 item 是整数或者实现了 tp_as_number->nb_index // 那么表示索引，会转成 Py_ssize_t，如果转换失败，那么会设置异常回溯栈 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError); // 如果 PyErr_Occurred() 为真，那么表示有异常发生 // 但问题是这里为什么要多一个 i == -1 呢？我们稍后再说 if (i == -1 && PyErr_Occurred()) return NULL; // 如果转换之后发现 i 小于 0，表示使用的是负数索引 // 那么要加上长度，变成正数索引，因此负数索引本质上也是 Python 的一个语法糖 if (i < 0) i += PyBytes_GET_SIZE(self); // 到这里发现 i 如果还小于 0，或者本身大于等于长度，那么索引越界 if (i < 0 || i >= PyBytes_GET_SIZE(self)) { PyErr_SetString(PyExc_IndexError, \"index out of range\"); return NULL; } // 否则说明索引 i 是合法的，那么获取数组 ob_sval 中索引为 i 的元素 // 但拿到的是 C 的整数，所以还要基于 C 整数创建 Python 整数，然后返回 return PyLong_FromLong((unsigned char)self->ob_sval[i]); } // 如果 item 是切片 else if (PySlice_Check(item)) { // 我们知道切片有三个属性，分别是起始位置、终止位置、步长 Py_ssize_t start, stop, step, slicelength, i; size_t cur; char* source_buf; char* result_buf; PyObject* result; // 解析切片，将内部属性赋值给 start、stop、step // 关于 PySlice_Unpack 我们在介绍切片的时候说过 if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 这个函数在介绍切片的时候也说过 // 它会调整 start 和 stop 的值，比如将负数转成正数，然后返回应该遍历的元素个数 slicelength = PySlice_AdjustIndices(PyBytes_GET_SIZE(self), &start, &stop, step); // 如果小于等于 0，说明截取不到任何元素，因此直接返回空字节串 if (slicelength <= 0) { // 基于 C 的字符数组和拷贝的字节数，创建 Python 的字节串 return PyBytes_FromStringAndSize(\"\", 0); } // 如果 start 为 0，step 为 1，并且截取的元素个数和原始字节串的长度相等 // 比如 buf[::] 这种，说明截取之后的字节串和原始字节串相同 // 那么直接给原始字节串增加一个引用计数，然后返回即可 else if (start == 0 && step == 1 && slicelength == PyBytes_GET_SIZE(self) && PyBytes_CheckExact(self)) { Py_INCREF(self); return (PyObject *)self; } // 如果步长为 1，那么从索引为 start 的位置截取 slicelength 个字节即可 // PyBytes_AS_STRING(self) 会返回字节串的 ob_sval，即 C 字符数组 // ob_sval + start 会将指针偏移到索引为 start 的位置 // 然后通过 C 的 memcpy 函数从 start 开始拷贝 slicelength 个字节 else if (step == 1) { return PyBytes_FromStringAndSize( PyBytes_AS_STRING(self) + start, slicelength); } // 否则说明步长不为 1，此时只能使用循环了 else { // 拿到原始字节串的 ob_sval source_buf = PyBytes_AS_STRING(self); // 创建长度为 slicelength 的字节串 // 注意：此时内部字符数组的容量已经有了，但还没有元素 result = PyBytes_FromStringAndSize(NULL, slicelength); if (result == NULL) return NULL; // 拿到新创建的字节串的 ob_sval result_buf = PyBytes_AS_STRING(result); // 从 start 开始遍历，遍历 slicelength 次，指针每次跳 step 个元素 for (cur = start, i = 0; i < slicelength; cur += step, i++) { // 将元素设置进去 result_buf[i] = source_buf[cur]; } // 返回 return result; } } // 如果 item 既不是整数也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"byte indices must be integers or slices, not %.200s\", Py_TYPE(item)->tp_name); return NULL; }\n} 虽然代码有点长，但逻辑一点都不难。还是那句话，对于 C 这样朴素的语言来说，就是 if 判断加循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 基于索引和切片获取元素","id":"104","title":"基于索引和切片获取元素"},"105":{"body":"在看 bytes_subscript 源码时，我们提出了一个问题。 上面代码中为什么要有一个 i == -1 判断呢？要解释这一点，首先必须要理解 Python 的异常是怎么抛出来的。 所谓的抛异常，本质上就是底层的某个 C 函数的代码逻辑出现了问题，不能继续执行了，于是将异常信息设置到回溯栈中，并给出一个表示错误的返回值。当解释器发现返回值不对时，就知道程序出错了，于是将回溯栈的异常写入到 stderr（标准错误输出）中。 比如这里，当检测到索引小于 0 或大于等于长度时，就知道索引越界了，不能再执行了。于是会通过 PyErr_SetString 将异常设置到回溯栈中，并返回了 NULL，表示错误的返回值。 因为对于当前函数来说，它的返回值类型是 PyObject *，如果正常执行，那么返回值应该指向一个合法的 PyObject。但当逻辑出现错误时，就意味着函数不能再执行了，于是设置异常并返回 NULL。而解释器在看到返回值为 NULL 时，就知道该函数执行出现错误了，那么会将回溯栈里的异常信息输出到 stderr 中， data = []\n# data[1] 在底层会执行 bytes_subscript(data, 1)\n# 但是发现索引 1 大于等于长度，于是会将异常信息写入到 stderr，并返回 NULL\n# 解释器发现返回的是 NULL，就知道执行出错了，否则返回值一定会指向一个合法的 PyObject\n# 于是解释器会将回溯栈里的异常写入到 stderr，并终止运行（暂时不考虑异常捕获）\nprint(data[1]) 在 Python 中看到的就是下面这个样子。 所以这就是抛异常的本质，如果 C 函数执行逻辑有问题，那么会以异常的形式将信息写入到回溯栈，并给出一个表示错误的返回值。外界发现返回值有问题时，就知道执行出错了，最终会由解释器将回溯栈里的异常写入到 stderr 当中。 既然 C 函数执行出现问题会设置异常，那么判断函数执行是否有问题，除了看它的返回值是否正常之外，还可以通过检测异常回溯栈。如果回溯栈里面有异常，调用 PyErr_Occurred 会返回真，否则返回假。 但 PyErr_Occurred 的效率稍微低一些，而直接判断返回值会更快，因为只是一个比较操作。比如这里的 bytes_subscript 函数，只需要检测它的返回值是否等于 NULL 即可判断函数执行是否出现异常。因为返回值类型是 PyObject *，如果正常执行，返回值一定不是 NULL，否则说明程序出问题了。 但 PyNumber_AsSsize_t 函数则不同，该函数的返回值类型是整型。 索引要么是整数，要么是实现了 __index__ 的类的实例对象，内部调用的 _PyNumber_Index 会统一将 item 转成 Python 整数并返回，如果转换失败则设置异常并返回 NULL。 而 PyNumber_AsSsize_t 函数则负责将 Python 整数转成 C 的 ssize_t 整数，但当它发现返回的 value 没有指向一个合法的 PyObject，而是 NULL，就知道 _PyNumber_Index 执行失败了。那么对于 PyNumber_AsSsize_t 而言，它也不能再执行了，应该返回一个表示错误的返回值。但 PyNumber_AsSsize_t 的返回值类型不是 PyObject *，而是整型，所以它不能返回 NULL。那么返回多少呢？解释器使用 -1 来充当表示错误的哨兵返回值。 但 -1 除了可以表示出现错误，也可能是函数正常执行，而返回值本身就是 -1。所以和指针类型不同，对于指针类型，通过返回值是否为 NULL 即可判断函数是否执行正常，而返回整型则需要借助 PyErr_Occurred。 比如发现 i 不等于 -1，说明 PyNumber_AsSsize_t 执行正常，不用再判断了。如果 i 等于 -1，那么则需要进一步检查异常回溯栈，如果栈不为空，证明确实发生错误了。如果栈为空，证明此时返回的 -1 不是因出现错误而返回的哨兵值，而是函数正常执行、但返回值本身就是 -1。 假设 PyNumber_AsSsize_t 因为索引类型不合法而返回了 -1，那么 bytes_subscript 就知道调用出现了错误，于是也不能再执行了，于是立即返回。由于它的返回值类型是 PyObject *，所以会返回 NULL。而最后当解释器看到 bytes_subscript 返回的是 NULL 时，就知道程序应该报错，于是会将回溯栈里的异常抛出来，并结束进程。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 聊一聊异常","id":"105","title":"聊一聊异常"},"106":{"body":"以上我们就介绍了 bytes 对象（字节串）的一些操作的底层实现，不过还没结束，下一篇文章我们来聊一聊 bytes 对象的加法运算。 当然加法运算本身很简单，之所以单独摘出来是因为背后涉及一个非常重要的概念：缓冲区，它也是 Numpy 得以实现的关键，下一篇文章细聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 小结","id":"106","title":"小结"},"107":{"body":"bytes 对象支持加法运算，将两个 bytes 对象合并为一个，举个例子。 b1 = b\"abc\"\nb2 = b\"def\"\nprint(b1 + b2) # b'abcdef' 这背后是怎么实现的呢？我们通过源码分析一下，并通过 bytes 对象的相加，介绍一下缓冲区的知识。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 楔子","id":"107","title":"楔子"},"108":{"body":"提到加法，很容易联想到 PyNumberMethods 的 nb_add，比如：PyLongObject 的 long_add 和 PyFloatObject 的 float_add。 但对于 bytes 对象而言却不是这样，加法操作对应的是 PySequenceMethods 的 sq_concat。所以我们将加法运算改成合并，会更合适一些，只是它在 Python 层面对应的也是 + 操作符。对于 bytes 对象而言，sq_concat 字段会被赋值为 bytes_concat。 static PyObject *\nbytes_concat(PyObject *a, PyObject *b)\n{ // 两个 Py_buffer 结构体类型的变量，用于维护缓冲区 // 关于缓冲区，我们一会儿说 Py_buffer va, vb; // 相加结果 PyObject *result = NULL; // 此时缓冲区啥也没有，默认将缓冲区的长度初始化为 -1 va.len = -1; vb.len = -1; // 每个 bytes 对象底层都对应一个缓冲区，可以通过 PyObject_GetBuffer 获取 // 这里获取两个 bytes 对象的缓冲区，然后交给变量 va 和 vb // 获取成功返回 0，获取失败返回非 0 // 如果下面的条件不成功，就意味着获取失败了，说明至少有一个老铁不是 bytes 类型 if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 || PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) { // 然后设置异常，PyExc_TypeError 表示 TypeError（类型错误） // 专门用来表示对一个对象执行了它所不支持的操作 PyErr_Format(PyExc_TypeError, \"can't concat %.100s to %.100s\", Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name); // 比如 b\"123\" + 123 就会得到 TypeError: can't concat int to bytes // 和这里设置的异常信息是一样的，然后当出现异常之后，直接跳转到 done 标签 goto done; } // 这里判断是否有一方长度为 0 // 如果 a 的长度为 0，那么相加之后的结果就是 b if (va.len == 0 && PyBytes_CheckExact(b)) { result = b; Py_INCREF(result); goto done; } // 逻辑和上面类似，如果 b 的长度为 0，那么相加之后的结果就是 a if (vb.len == 0 && PyBytes_CheckExact(a)) { result = a; Py_INCREF(result); goto done; } // 判断两个 bytes 对象合并之后，长度是否超过 PY_SSIZE_T_MAX // 所以 bytes 对象是有长度限制的，因为维护长度的 ob_size 有最大范围 // 但还是之前说的，这个条件基本不可能满足，除非你写恶意代码 // 补充一句，这个 if 条件看起来会有些别扭，更直观的写法应该像下面这样 // if (va.len + vb.len > PY_SSIZE_T_MAX)，但 va.len + vb.len 可能会溢出 if (va.len > PY_SSIZE_T_MAX - vb.len) { PyErr_NoMemory(); goto done; } // 否则的话，创建指定容量的 PyBytesObject result = PyBytes_FromStringAndSize(NULL, va.len + vb.len); if (result != NULL) { // PyBytes_AS_STRING 会获取 PyBytesObject 的 ob_sval 字段 // 将缓冲区 va 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 va.len memcpy(PyBytes_AS_STRING(result), va.buf, va.len); // 将缓冲区 vb 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 vb.len // 但是要从 va.len 的位置开始拷贝，不然会把之前的内容覆盖掉 memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len); } done: // 拷贝完之后，将 va 和 vb 里的内容释放掉，否则可能会导致内存泄漏 if (va.len != -1) PyBuffer_Release(&va); if (vb.len != -1) PyBuffer_Release(&vb); return result;\n} 代码虽然有点长，但是不难理解，重点是里面的 Py_buffer。我们以 a = b\"ab\"，b = b\"cde\" 为例，看一下 a + b 是怎么做的？ 说白了整个过程就是将 a->ob_sval 和 b->ob_sval 拷贝到 result->ob_sval 中。但问题是为啥不直接拷贝，而是要搞出来一个 Py_buffer 呢？这就要说一说 Python 的缓冲区了。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » bytes 对象的加法运算","id":"108","title":"bytes 对象的加法运算"},"109":{"body":"为了更好地理解缓冲区，我们需要解释一下什么是缓冲区协议。缓冲区协议是一个 C 级协议，它定义了一个具有数据缓冲区和元数据的 C 级结构体，这个结构体就是上面的 Py_buffer。通过 Py_buffer 来描述缓冲区的布局、数据类型和读写权限，并且还定义了支持协议的对象所必须实现的 API。 实现缓冲区协议的对象有 bytes对象、array.array 对象、以及最知名的 numpy.ndarray 对象。 至于缓冲区本身，它就是一个单纯的一维数组，负责存储具体的数据。我们以 numpy 数组为例，不管数组是多少维的，底层的缓冲区永远是一个一维数组。那么问题来了，我们在定义数组时设置的维度信息要如何体现呢？答案是通过 Py_buffer，来看一下它的底层结构。 // Include/cpython/object.h typedef struct bufferinfo { // 指针，指向具体的缓冲区，注意：缓冲区就是个一维数组 void *buf; // 指向实现缓冲区协议的对象本身 PyObject *obj; // 缓冲区的长度 Py_ssize_t len; // 缓冲区中每个元素的大小 Py_ssize_t itemsize; // 缓冲区是否只读，0 表示可读写、1 表示只读 int readonly; // 维度，比如数组的 shape 为 (3, 4, 5)，那么它的 ndim 就是 3 int ndim; // 格式化字符串，用于描述缓冲区的元素类型 char *format; // 等价于 numpy 数组的 shape // 因此缓冲区永远是个一维数组，由 buf 字段指向 // 而其它字段则负责描述这个一维数组应该怎么使用 Py_ssize_t *shape; // 在某个维度下，从一个元素到下一个元素所需要跳跃的字节数 Py_ssize_t *strides; Py_ssize_t *suboffsets; void *internal;\n} Py_buffer; 以上就是 Py_buffer，它的 buf 字段指向了具体的缓冲区，对于 bytes 对象而言就是内部的 ob_sval 字段。再比如 numpy 数组的拷贝，默认情况下在拷贝数组时只会将 Py_buffer 拷贝一份，而 Py_buffer 内部的 buf 字段指向的缓冲区则不会拷贝。 import numpy as np # Py_buffer.buf 指向了缓冲区\n# Py_buffer.shape 为 (6,)\narr1 = np.array([3, 9, 5, 7, 6, 8])\n# 将 Py_buffer 拷贝一份，并且 Py_buffer.shape 变成了 (2, 3)\n# 但 Py_buffer.buf 指向的缓冲区没有拷贝\narr2 = arr1.reshape((2, 3)) # 然后在通过索引访问的时候，可以认为 numpy 为其创建了虚拟的索引轴\n# 由于 arr1 只有一个维度，那么 numpy 会为其创建一个虚拟的索引轴\n\"\"\"\narr1 = [3 9 5 7 6 8] index1: 0 1 2 3 4 5 buf: 3 9 5 7 6 8 \"\"\"\n# arr2 有两个维度，shape 是 (2, 3)\n# 那么 numpy 会为其创建两个虚拟的索引轴\n\"\"\"\narr2 = [[3, 9, 5] [7, 6, 8]] index1: 0 0 0 1 1 1 index2: 0 1 2 0 1 2 buf: 3 9 5 7 6 8 \"\"\"\n# 缓冲区中索引为 4 的元素被修改\narr2[1, 1] = 666\n# 由于 arr1 和 arr2 共享一个缓冲区\n# 所以 print(arr1[4]) 也会打印 666\nprint(arr1[4]) # 666 以上就是缓冲区的内容，关于缓冲区在后续还会详细介绍，到时候我们也会让自定义的实例对象支持缓冲区。 回到 bytes 对象，它也实现了缓冲区协议，内部的 ob_sval（一个一维数组）就是对应的缓冲区，Py_buffer 里面的 buf 字段同样指向了这个缓冲区，而其它的字段则负责描述该如何使用这个缓冲区，可以理解为元信息。正如 numpy 的数组，虽然多个数组底层共用一个缓冲区，数据也只有一份，但在 numpy 的层面却可以表现出不同的维度，究其原因就是元信息不同。 相信你现在肯定明白 Py_buffer 存在的意义了，就是共享内存。不管什么对象，只要实现了缓冲区协议，那么就可以直接向彼此暴露自身的缓冲区。并且在操作的时候，统一使用 Py_buffer，保证不同类型的对象的操作是一致的。 import numpy as np # bytes 对象实现了缓冲区协议，后续操作时会创建 Py_buffer 实例\n# Py_buffer.buf 指向的缓冲区便是 bytes 对象的 ob_sval\n# 对于当前来说就是 {'a', 'b', 'c', 'd', '\\0'}\nb = b\"abcd\" # np.frombuffer 表示基于已有的缓冲区创建数组，因此会共享 bytes 对象的缓冲区\n# 但问题是缓冲区只是一个普通的一维数组，numpy 该怎么解析这个缓冲区呢\n# 所以我们必须显式地指定 dtype，而 \"S1\" 表示按照单个字节来进行解析\narr1 = np.frombuffer(b, dtype=\"S1\")\nprint(arr1) # [b'a' b'b' b'c' b'd'] # \"S2\" 表示按照两个字节来进行解析\narr2 = np.frombuffer(b, dtype=\"S2\")\nprint(arr2) # [b'ab' b'cd'] # 那么问题来了，按照三个字节解析是否可行呢？\n# 答案是不可行，因为缓冲区的大小不是 3 的整数倍\n# 而 \"S4\" 显然是可以的\narr3 = np.frombuffer(b, dtype=\"S4\")\nprint(arr3) # [b'abcd'] # 按照 int8 进行解析\narr4 = np.frombuffer(b, dtype=\"int8\")\nprint(arr4) # [ 97 98 99 100] # 按照 int16 进行解析\n# 显然 97 98 整体会被解析成一个整数，99 100 整体会被解析成一个整数\n# 你想到了什么，这不就类似于 Python 整数的底层实现嘛\n\"\"\"\n97 -> 01100001\n98 -> 01100010\n那么 97 98 组合起来就是 01100010_01100001 99 -> 01100011\n100 -> 01100100\n那么 99 100 组合起来就是 01100100_01100011\n\"\"\"\nprint(0b01100010_01100001) # 25185\nprint(0b01100100_01100011) # 25699\nprint(np.frombuffer(b, dtype=\"int16\")) # [25185 25699] # 按照 int32 来解析，显然这 4 个字节整体表示一个 int32\nprint(0b01100100_01100011_01100010_01100001) # 1684234849\nprint(np.frombuffer(b, dtype=\"int32\")) # [1684234849] 怎么样，是不是有点神奇呢？相信你在使用 numpy 的时候应该会有更加深刻的认识了，这就是缓冲区协议的威力。哪怕是不同的对象，只要都实现了缓冲区协议，那么彼此之间就可以暴露底层的缓冲区，从而实现共享内存。 所以 np.frombuffer 就是直接根据对象的缓冲区来创建数组，然后它底层的 buf 字段也指向这个缓冲区。但它不知道该如何解析这个缓冲区，所以我们需要显式地指定 dtype 来告诉它，相当于告诉它一些元信息。 那么问题来了，我们能不能修改缓冲区呢？ import numpy as np b = b\"abcd\"\narr = np.frombuffer(b, dtype=\"S1\") try: arr[0] = b\"A\"\nexcept ValueError as e: print(e) # assignment destination is read-only # 答案是不可以的，因为原始的 bytes 对象不可修改，所以缓冲区只读\n# 但我们真的就没办法了吗？还记得之前介绍的骚操作吗？\nfrom ctypes import * class PyBytesObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_shash\", c_ssize_t), (\"ob_sval\", 5 * c_byte), ]\nobj = PyBytesObject.from_address(id(b))\n# 修改缓冲区之前，打印 arr\nprint(arr) # [b'a' b'b' b'c' b'd']\n# 修改缓冲区之后，打印 arr\nobj.ob_sval[0] = ord(\"A\")\nprint(arr) # [b'A' b'b' b'c' b'd'] 我们看到由于共享缓冲区，所以修改 bytes 对象也会影响数组 arr，只是由于 bytes 对象不可变，我们只能出此下策。但其实还有一个办法，就是使用 bytearray 对象。 import numpy as np # 可以理解为可变的 bytes 对象\nb = bytearray(b\"abcd\")\narr = np.frombuffer(b, dtype=\"S1\") print(b) # bytearray(b'abcd')\n# 此时缓冲区是可修改的，并且修改任何一个对象都会影响另一个，因为它们共享同一个缓冲区\narr[0] = b\"A\"\n# 再次打印\nprint(b) # bytearray(b'Abcd') Py_buffer 的实现，也是 numpy 诞生的一个重要原因。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 详解缓冲区","id":"109","title":"详解缓冲区"},"11":{"body":"所谓定长和变长，取决于对象所占的内存大小是否固定，举个例子。 >>> import sys\n>>> sys.getsizeof(\"\")\n49\n>>> sys.getsizeof(\"hello\")\n54\n>>> sys.getsizeof(\"hello world\")\n60 >>> sys.getsizeof(1.0)\n24\n>>> sys.getsizeof(3.14)\n24\n>>> sys.getsizeof((2 << 30) + 3.14)\n24\n>>> 我们看到字符串的长度不同，所占的内存也不同，像这种内存大小不固定的对象，我们称之为变长对象；而浮点数所占的内存都是一样的，像这种内存大小固定的对象，我们称之为定长对象。 至于 Python 如何计算对象所占的内存，我们在剖析具体对象的时候会说，因为这涉及到底层对应的结构体。 所以变长对象的特点是：同一个类型的实例对象，如果值不同，那么占用的内存大小不同。像字符串、列表、元组、字典等，它们毫无疑问都是变长对象。值得一提的是，整数也是变长对象，因为 Python 整数的值在底层是通过数组维护的，后续介绍整数实现的时候再聊。 而定长对象的特点是：同一个类型的实例对象，不管值是多少，占用的内存大小始终是固定的，比如浮点数。因为 Python 的浮点数的值在 C 中是通过一个 double 来维护的。而 C 里面值的类型一旦确定，那么内存大小就不变了，所以 Python 浮点数的内存大小也是不变的。 但既然类型固定，内存大小固定，那么范围肯定是有限的。所以当浮点数不断增大，会牺牲精度来进行存储。 如果实在过大，则抛出 OverFlowError。 当然除了浮点数之外，布尔值、复数等也属于定长对象，它们占用的内存大小是固定的。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 定长对象和变长对象","id":"11","title":"定长对象和变长对象"},"110":{"body":"通过两个 bytes 对象相加，我们了解了什么是缓冲区、缓冲区协议，以及存在的作用，并且通过 numpy 进行了解释。了解缓冲区，可以让你更加深刻地理解 numpy。 下面再来总结一下： 如果一个类型对象实现了 tp_as_buffer，那么它的实例对象便支持缓冲区协议； tp_as_buffer 是一个函数指针，指向的函数负责初始化 Py_buffer； 在共享缓冲区的时候，比如 np.frombuffer(obj)，会直接调用 obj 的类型对象的 tp_as_buffer 字段指向的函数，拿到 Py_buffer 实例的 buf 字段指向的缓冲区。但 numpy 不知道该怎么解析这个缓冲区，所以还需要我们指定 dtype 参数。 缓冲区存在的最大意义就是共享内存，numpy 的数组在拷贝的时候，默认只拷贝 Py_buffer 实例，至于 Py_buffer 的 buf 字段指向的缓冲区默认是不会拷贝的。比如数组有 100 万个元素，这些元素都存储在缓冲区中，被 Py_buffer 的 buf 字段指向，拷贝的时候这 100 万个元素是不会拷贝的。 numpy 数组的维度、shape，是借助于 Py_buffer 中的元信息体现的，维度和 shape 不同，访问缓冲区元素的方式也不同。但存储元素的缓冲区，永远是一个一维数组，由 buf 字段指向。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 小结","id":"110","title":"小结"},"111":{"body":"bytes 对象是不可变对象，那么根据我们对浮点数的了解，可以大胆猜测 bytes 对象也有自己的缓存池。事实上确实如此，为了优化单字节 bytes 对象的创建效率，Python 底层维护了一个缓存池，该缓存池是一个 PyBytesObject * 类型的数组。 // Objects/bytesobject.c // 保存了 256 个单字节 bytes 对象，对应的 ASCII 码为 0 ~ 255\nstatic PyBytesObject *characters[UCHAR_MAX + 1];\n// 保存空 bytes 对象\nstatic PyBytesObject *nullstring; Python 内部创建单字节 bytes 对象时，会先检查目标对象是否已在缓存池中。PyBytes_FromString 函数是负责创建 bytes 对象的一个常用的 Python/C API，我们看一下它的逻辑。 // Objects/bytesobject.c // 基于 C 字符串创建 bytes 对象\nPyObject *\nPyBytes_FromString(const char *str)\n{ size_t size; // bytes 对象的长度 PyBytesObject *op; // 指向创建的 bytes 对象 assert(str != NULL); // 计算 C 字符串的长度，它和对应的 bytes 对象的长度是相等的 size = strlen(str); if (size > PY_SSIZE_T_MAX - PyBytesObject_SIZE) { PyErr_SetString(PyExc_OverflowError, \"byte string is too long\"); return NULL; } // 如果 size 等于 0，并且 nullstring 保存了空 bytes 对象，那么直接返回 if (size == 0 && (op = nullstring) != NULL) {\n#ifdef COUNT_ALLOCS _Py_null_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 如果 size 等于 1，比如 char *str = \"a\"，证明创建的是单字节对象 // 而 str 是字符串首元素的地址，所以 *str 会得到 'a'，即 97 // 假设 *str 是 97，那么 op 就是 bytes_characters[97] if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {\n#ifdef COUNT_ALLOCS _Py_one_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 否则创建新的 PyBytesObject 对象，此时是个空 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size); if (op == NULL) return PyErr_NoMemory(); // 初始化内部字段 (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); op->ob_shash = -1; // 将 C 字符串拷贝到 ob_sval 中 memcpy(op->ob_sval, str, size+1); // 如果 size == 0，说明创建的是空 bytes 对象，那么赋值给 nullstring if (size == 0) { nullstring = op; Py_INCREF(op); } else if (size == 1) { // 如果 size == 1，说明创建的是单字节 bytes 对象，那么放入到缓存池中 // 并且在缓存池中的索引，就是该字节对应的 ASCII 码 characters[*str & UCHAR_MAX] = op; Py_INCREF(op); } // 转成泛型指针之后返回 return (PyObject *) op;\n} 整体来说并不难，该 API 会将 C 字符串全部拷贝到 ob_sval 中。但如果 C 字符串长度为 10，而我们只希望基于前 n 个字符创建 bytes 对象，这时候可以使用 PyBytes_FromStringAndSize 函数。 PyBytes_FromString(\"Hello World\") 会返回 b\"Hello World\"。 PyBytes_FromStringAndSize(\"Hello World\", 5) 会返回 b\"Hello\"，如果传递的第二个参数 size 和 C 字符串长度相同，那么效果和 PyBytes_FromString 是等价的。 至于 PyBytes_FromStringAndSize 的逻辑和 PyBytes_FromString 类似，缓存池部分也是一样的，可以自己看一下。 当 Python 程序开始运行时，字节序列缓存池是空的。但随着单字节 bytes 对象的创建，缓存池中的对象慢慢多了起来。这样一来，单字节序列首次创建后便在缓存池中缓存起来，后续再使用时会直接从缓存池中获取，避免重复创建和销毁。与前面章节介绍的小整数对象池一样，字节序列缓存池也只能容纳为数不多的 256 个单字节序列，但使用频率非常高。 缓存池技术作为一种以空间换时间的优化手段，只需较小的内存为代价，便可明显提升执行效率。 >>> a1 = b\"a\"\n>>> a2 = b\"a\"\n>>> a1 is a2\nTrue\n>>>\n>>> a1 = b\"ab\"\n>>> a2 = b\"ab\"\n>>> a1 is a2\nFalse\n>>> 显然此时不需要解释了，单字节 bytes 对象会缓存起来，放到缓存池中。至于空字节 bytes 对象，则是由专门的 nullstring 变量保存，它们都是单例的。 到目前为止，关于 bytes 对象的内容就说完了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"26. 解密 bytes 对象的缓存池","id":"111","title":"26. 解密 bytes 对象的缓存池"},"112":{"body":"前面我们介绍了 bytes 对象，本篇文章来聊一聊 bytearray 对象，这两者都表示字节串或者字节序列，它们的创建方式和支持的操作也是类似的。 # 基于列表创建，里面的元素为 0 ~ 255 的整数\nb1 = bytes([97, 98, 99])\nb2 = bytearray([97, 98, 99])\nprint(b1)\nprint(b2)\n\"\"\"\nb'abc'\nbytearray(b'abc')\n\"\"\" # 基于字符串创建\nb1 = bytes(\"hello\", encoding='utf-8')\nb2 = bytearray(\"hello\", encoding='utf-8')\nprint(b1)\nprint(b2)\n\"\"\"\nb'hello'\nbytearray(b'hello')\n\"\"\" b1 = bytes.fromhex(\"61626364\")\nb2 = bytearray.fromhex(\"61626364\")\nprint(b1)\nprint(b2)\n\"\"\"\nb'abcd'\nbytearray(b'abcd')\n\"\"\" 但区别在于 bytes 对象是不可变对象，bytearray 对象是可变对象。 # 也可以直接基于 bytes 对象创建 bytearray 对象\n# 反过来也是如此\nb = bytearray(b\"satori\")\nprint(b) # bytearray(b'satori') # 既然是可变对象，那么就意味着可以本地修改内部元素\n# 由于字节序列内部的每个元素都是 0 ~ 255 的整数\n# 因此这里修改时，也必须赋值整数\nb[0] = ord(\"S\")\nprint(b) # bytearray(b'Satori') # 当然，如果基于切片修改，那么需要赋值一个 bytes 对象\nb[0: 2] = b\"SA\"\nprint(b) # bytearray(b'SAtori')\n# 当然也可以赋值一个 bytearray 对象\n# 它和 bytes 对象本质一样，无非是 bytes 对象不能本地修改\nb[0: 3] = bytearray(b\"saT\")\nprint(b) # bytearray(b'saTori') # 在尾部追加字节\nb.append(ord(\" \"))\nb.append(ord(\"h\"))\nb.append(ord(\"e\"))\nb.append(ord(\"l\"))\nb.append(ord(\"l\"))\nb.append(ord(\"o\"))\nprint(b) # bytearray(b'saTori hello') 还是那句话，如果不需要对字节序列做修改的话，那么 bytes 对象和 bytearray 对象是等价的，我们使用 bytes 对象即可。但若是希望字节序列可变，那么只能使用 bytearray 对象。 下面我们来分析一下 bytearray 对象的底层实现。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 楔子","id":"112","title":"楔子"},"113":{"body":"bytearray 对象在底层由 PyByteArrayObject 结构体表示，定义如下。 // Include/bytearrayobject.h typedef struct { PyObject_VAR_HEAD Py_ssize_t ob_alloc; char *ob_bytes; char *ob_start; int ob_exports;\n} PyByteArrayObject; 解释一下每个字段的含义： PyObject_VAR_HEAD：变长对象的公共头部，包含引用计数、类型和长度。 ob_alloc：底层缓冲区的长度，即最多能容纳多少个字节。注意它和 ob_size 的区别，ob_size 表示 bytearray 对象的长度，也就是缓冲区当前已经容纳了多少个字节。如果 append 的时候发现 ob_size 达到了 ob_alloc，那么要对缓冲区进行扩容。 ob_bytes：指向缓冲区的指针，缓冲区是一个连续的内存块，用于存储字节序列的所有数据。 ob_start：ob_bytes 指向缓冲区的物理起始位置，而 ob_start 指向缓冲区的逻辑起始位置。说白了 ob_start 可以指向缓冲区的任意位置，允许字节序列使用部分缓冲区，比如通过切片 [1:] 进行截取，那么 ob_start 便指向缓冲区的第二个元素（逻辑起始位置），而无需重新分配内存。 ob_exports：缓冲区被外部对象引用的次数。 下面我们来创建几个 bytearray 对象，并通过画图来描述对应的底层结构。 b = bytearray(b\"\") 每个结构体字段都是 8 字节，所以一个空 bytearray 对象的大小是 56 字节。 >>> b = bytearray()\n>>> b\nbytearray(b'')\n>>> b.__sizeof__()\n56 结果和我们分析的一样。 b = bytearray(b\"abc\") 由于缓冲区长度为 4，因此大小为 56 + 4 = 60 字节。 >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60 所以我们可以得出结论，bytearray 对象的大小等于 56 + 缓冲区的长度，在不发生扩容的情况下，缓冲区的长度等于 ob_size + 1。 >>> name = \"古明地觉\"\n>>> b = bytearray(name, encoding=\"utf-8\")\n>>> >>> 56 + len(name) * 3 + 1\n69\n>>> b.__sizeof__()\n69 但如果发生扩容会怎么样呢？ >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60\n# 添加一个元素\n>>> b.append(100)\n>>> b\nbytearray(b'abcd')\n>>> b.__sizeof__()\n63 添加一个元素之后，大小从 60 变成了 63，难道不应该是 61 吗？之所以出现这个现象，就是因为扩容的时候多申请了两个字节，我们画张图来展示一下这个过程。 以上就是 bytearray 对象的底层结构。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的底层实现","id":"113","title":"bytearray 对象的底层实现"},"114":{"body":"说完了 bytearray 对象的底层结构之后，再来看看它是怎么创建的？ // Objects/bytearrayobject.c PyObject *\nPyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)\n{ // 基于 C 的字符数组创建 bytearray 对象 // 参数 size 表示 bytearray 对象的长度 PyByteArrayObject *new; Py_ssize_t alloc; // size 必须大于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyByteArray_FromStringAndSize\"); return NULL; } // size 必须小于 PY_SSIZE_T_MAX if (size == PY_SSIZE_T_MAX) { return PyErr_NoMemory(); } // 为 PybyteArrayObject 申请内存，此处调用的是泛型 API new = PyObject_New(PyByteArrayObject, &PyByteArray_Type); // 申请失败返回 NULL if (new == NULL) return NULL; // 如果 size == 0，表示 bytearray 对象的长度为 0 // 那么将 ob_bytes 设置为 NULL，将 alloc 设置为 0 if (size == 0) { new->ob_bytes = NULL; alloc = 0; } else { // 否则将 alloc 设置为 size + 1，因为要多一个 '\\0' alloc = size + 1; // 申请 alloc 个字节的内存，赋值给 ob_bytes new->ob_bytes = PyObject_Malloc(alloc); // 为 NULL 表示申请失败，内存不足 if (new->ob_bytes == NULL) { Py_DECREF(new); return PyErr_NoMemory(); } // 将参数 bytes（这里是 C 字符串）拷贝到 ob_bytes 指向的缓冲区 // 在拷贝的时候，可以指定拷贝的长度，通过 size 参数指定 // 如果希望整个字符串全部拷贝，那么将 size 指定为 strlen(bytes) 即可 if (bytes != NULL && size > 0) memcpy(new->ob_bytes, bytes, size); // 将最后一个元素（索引为 size）设置为 '\\0' new->ob_bytes[size] = '\\0'; /* Trailing null byte */ } // 将 ob_size 字段初始化为 size Py_SIZE(new) = size; // 将 ob_alloc 字段初始化为 alloc new->ob_alloc = alloc; // ob_start 默认等于 ob_bytes new->ob_start = new->ob_bytes; // 缓冲区被引用的次数为 0，因为刚创建 new->ob_exports = 0; // 转成泛型指针之后返回 return (PyObject *)new;\n} 之前在创建 bytes 对象的时候介绍过 PyBytes_FromStringAndSize 这个函数，创建 bytearray 对象和它是类似的。但需要注意的是，bytes 对象和 bytearray 对象都实现了缓冲区，但这两者有一个区别。 bytes 对象的缓冲区存储在 PyBytesObject 结构体内部； bytearray 对象则不是这样，PyByteArrayObject 内部存储的是指针，指针指向了缓冲区； 我们回顾一下这两个结构体的定义。 PyBytesObject 里面的 ob_sval 是一个数组，而 PyByteArrayObject 的 ob_bytes 是一个指针。那为什么会出现这种情况呢？原因在这个系列的最开始就说过了，bytes 对象是不可变的，元素会直接存储在对应的结构体内部。 而 bytearray 对象是可变的，那么它内部只能存储指针，指针指向的内存区域负责存储元素。如果发生扩容，只需申请一片更大的内存区域并将元素拷贝过去，然后改变指针（ob_bytes）指向即可。至于 bytearray 对象本身的地址是不会发生任何变化的，它的扩容对引用它的变量来说是无感知的。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的创建","id":"114","title":"bytearray 对象的创建"},"115":{"body":"以上就是 bytearray 对象，关于它的具体操作就不赘述了，和 bytes 对象是类似的，可以自己尝试读一读。 总之在工作中，如果你不明确需要字节序列可变，那么使用 bytes 对象即可，否则使用 bytearray 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 小结","id":"115","title":"小结"},"116":{"body":"接下来我们将分析 Python 的字符串，这应该是使用频率最高的数据结构了，我们会通过多篇文章来详细阐述字符串的实现原理。 首先字符串是一个变长对象，因为不同长度的字符串所占的内存是不一样的。但同时字符串又是一个不可变对象，因为一旦创建就不可以再修改了。","breadcrumbs":"28. 字符集和字符编码 » 楔子","id":"116","title":"楔子"},"117":{"body":"我们知道计算机的存储单位是字节，一个字节可以表示 256 种字符，对于发明计算机的美国人来说足够了。因为英文字母算上大小写只有 52 个，即便再加上一些特殊字符，数量也不会超过 256 个，因此一个字节完全可以表示。 但随着计算机的普及，越来越多的非英文字符出现，导致一个字节已经无法表示了。所以只能曲线救国，对于一个字节无法表示的字符，使用多个字节表示，这便是多字节编码。而多字节编码也存在相应的问题，就是容易出现乱码。 到这里先不继续往下深入，我们先来理清楚一些概念。","breadcrumbs":"28. 字符集和字符编码 » 多字节编码","id":"117","title":"多字节编码"},"118":{"body":"估计有很多小伙伴搞不清这两者的区别，我们先来解释一下所谓的字符集和字符编码是怎么一回事？ 字符集：系统支持的所有字符组成的集合，像 ASCII、GB2312、Big5、unicode 都属于字符集。只不过不同的字符集所能容纳的字符个数不同，比如 ASCII 字符集不包含中文，unicode 则可以容纳世界上的所有字符； 多字节编码：负责将每个字符转成一个或多个计算机可以接受的具体数字，该数字可以理解为编号，因此字符编码维护了字符和编号之间的对应关系。而编码也分为多种，比如 ASCII、GBK、UTF-8 等等，字符编码不同，那么字符转换之后的编号也不同，当然能转化的字符种类也不同。比如 ASCII 这种字符编码，它就只能转换 ASCII 字符。 当然，ASCII 比较特殊，它既是字符集、也是字符编码。并且不管采用什么编码，ASCII 字符对应的编号永远是相同的。 将字符串中的每一个字符转成对应的编号，那么得到的就是字节序列（bytes 对象），因为计算机存储和网络通讯的基本单位都是字节，所以字符串必须以字节序列的形式进行存储或传输。 因此字符串和字节序列在某种程度上是很相似的，字符串按照指定的编码进行 encode 即可得到字节序列，也就是将每个字符都转成对应的编号；字节序列按照相同的编码 decode 即可得到字符串，也就是根据编号找到对应的字符。 比如我们写了一段文本，然后在存储的时候必须先进行 encode，也就是将每一个字符都转成一个或多个系统可以接受的数字、即对应的编号之后，才可以进行存储。 name = \"古明地觉\" print(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\"\nprint(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 采用不同的编码，得到的字节序列是不同的，比如使用 gbk 编码 encode，那么也必须使用 gbk 编码 decode。否则会因为无法解析而报错，因为字符编码不同，字符对应的编号也不同。 再比如每个国家都有自己的字符编码，你在日本的一台计算机上写好的文件拿到中国的计算机上打开，很有可能出现乱码。因为字符编码不同，字符和编号之间的对应关系也不同，采用不同的字符编码进行解析肯定会出问题。 但我们说，对于 ASCII 字符来说，由于不管采用哪一种编码，它们得到的编号都是固定的。所以编码对于 ASCII 字符来说，没有任何影响。 name = \"satori\" print(name.encode(\"gbk\"))\n\"\"\"\nb'satori'\n\"\"\"\nprint(name.encode(\"gbk\").decode(\"utf-8\"))\n\"\"\"\nsatori\n\"\"\" # 但如果是非 ASCII 字符，就不行了\ntry: \"你好\".encode(\"gbk\").decode(\"utf-8\")\nexcept UnicodeDecodeError as e: print(e) \"\"\" 'utf-8' codec can't decode byte 0xc4 in position 0: invalid continuation byte \"\"\" 这里再回忆一下 bytes 对象，创建的时候可以采用字面量的方式，比如 b\"abc\"，但是 b\"憨\" 却不可以。原因就是憨这个字符不是 ASCII 字符，那么采用不同的字符编码，其对应的编号是不同的。而解释器又不知道我们使用的是哪一种编码，所以不允许这么做，而是需要通过 \"憨\".encode() 的方式手动指定字符编码。 但对于 ASCII 字符而言，不管采用哪一种字符编码，得到的编号都是一样的， 所以 Python 针对 ASCII 字符则允许这种做法，比如 b\"abc\"。并且我们看到，对于汉字来说，在编码之后会对应多个编号，而每个编号占 1 字节，因此不同的字符所占的大小可能不同。","breadcrumbs":"28. 字符集和字符编码 » 字符集和字符编码","id":"118","title":"字符集和字符编码"},"119":{"body":"以上就是字符集和字符编码，字符集就是字符组成的集合，不同字符集所能容纳的字符数量是有限的。字符编码是将字符转成对应的编号，比如将一个字符串中的所有字符都转成对应的编号之后，就得到了字节序列。当然和字符集一样，字符编码能转换的字符种类也是有限的，像汉字我们可以使用 GBK 编码、UTF-8 编码，但是不能使用 ASCII 编码。 以上算是理清楚了一些概念，显然过于简单了，主要是为后面的内容做铺垫。那么下一篇文章，我们就从 Python 的角度来分析字符串的存储方式。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"28. 字符集和字符编码 » 小结","id":"119","title":"小结"},"12":{"body":"以上我们就分析了对象的种类，对象可以被分为可变对象和不可变对象，以及变长对象和定长对象。 不可变对象：对象不支持本地修改； 可变对象：对象支持本地修改； 变长对象：对象维护的值不同，占用的内存大小也不同； 定长对象：占用的内存大小始终固定； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 小结","id":"12","title":"小结"},"120":{"body":"上一篇文章我们介绍了字符集，它是一系列字符组成的集合，但不同的字符集所能容纳的字符是有限的。于是为了能将全世界的字符统一起来，便诞生了 unicode。 unicode 字符集对世界上出现的所有字符都进行了系统的整理，包括各种 emoji，不管是哪个国家的语言，都可以使用 unicode 字符集。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"て\")) # 12390 不管什么文字，都可以用一个 unicode 来表示，它们在字符集中对应一个唯一的码点。所谓码点，就是字符在字符集中的索引，或者说唯一编号。 但是问题来了，unicode 能表示这么多的字符，占用的内存一定不低吧。的确，根据当时的编码，一个 unicode 字符最高会占用到 4 字节，因此对西方人来说就有点苦不堪言了，明明一个字节就够用了，为啥需要那么多。于是又出现了 utf-8，它是为 unicode 提供的一个新的编码规则，具有可变长的功能。不同种类的字符占用的大小不同，比如英文字符使用一个字节存储，汉字使用 3 个字节存储，emoji 使用 4 个字节存储。 但 Python 在表示 unicode 字符串时，使用的却不是 utf-8 编码，至于原因我们下面来分析一下。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 楔子","id":"120","title":"楔子"},"121":{"body":"从 Python3 开始，字符串使用的是 unicode。而根据编码的不同，unicode 的每个字符最大可以占用 4 字节，从内存的角度来说，这种编码有时会比较昂贵。为了减少内存消耗并且提高性能，Python 的内部使用了三种编码方式来表示 unicode。 Latin-1 编码：每个字符占 1 字节; UCS2 编码：每个字符占 2 字节； UCS4 编码：每个字符占 4 字节； 在 Python 编程中，所有字符串的行为都是一致的，而且大多数时候我们都没有注意到差异。然而在处理大文本的时候，这种差异就会变得异常显著，甚至有些让人出乎意料。为了看到内部表示的差异，我们看一下字符串所占的内存大小。 >>> sys.getsizeof(\"a\")\n50\n>>> sys.getsizeof(\"憨\")\n76\n>>> sys.getsizeof(\"😂\")\n80 我们看到都是一个字符，但它们占用的内存却是不一样的。因为 Python 面对不同的字符会采用不同的编码，进而导致大小不同。但需要注意的是，Python 的每一个字符串都需要额外占用至少 49 个字节，因为要存储一些元数据，比如：公共的头部、哈希、长度、字节长度、编码类型等等。 import sys # 对于 ASCII 字符，一个占 1 字节，此时是 Latin-1 编码\nprint(sys.getsizeof(\"ab\") - sys.getsizeof(\"a\")) # 1 # 对于汉字，日文等等，一个占 2 字节，此时是 UCS2 编码\nprint(sys.getsizeof(\"憨憨\") - sys.getsizeof(\"憨\")) # 2\nprint(sys.getsizeof(\"です\") - sys.getsizeof(\"で\")) # 2 # 像 Emoji，则是一个占 4 字节 ，此时是 UCS4 编码\nprint(sys.getsizeof(\"😂😂\") - sys.getsizeof(\"😂\")) # 4 而采用不同的编码，底层结构体实例的元数据也会占用不同大小的内存。 # 所以一个空字符串占用 49 个字节\n# 此时会采用占用内存最小的 Latin-1 编码\nprint(sys.getsizeof(\"\")) # 49\n# 此时使用 UCS2\nprint(sys.getsizeof(\"憨\") - 2) # 74\n# UCS4\nprint(sys.getsizeof(\"🍌\") - 4) # 76 如果编码是 Latin-1，那么结构体实例的元数据会占 49 个字节；编码是 UCS2，占 74 个字节；编码是 UCS4，占 76 个字节。然后字符串所占的字节数就等于：元数据 + 字符个数 * 单个字符所占的字节。","breadcrumbs":"29. Python 是怎么存储字符串的？ » unicode 的三种编码","id":"121","title":"unicode 的三种编码"},"122":{"body":"上面提到的三种编码是 Python 在底层所使用的，但我们知道 unicode 还有一个 utf-8 编码，那 Python 为啥不用呢？ 先来抛出一个问题，我们知道 Python 支持通过索引查找一个字符串指定位置的字符（注意不是字节），比如 s[2] 查找的就是字符串 s 中的第 3 个字符。 s = \"古明地觉\"\nprint(s[2]) # 地 那么问题来了，通过索引查找字符串的某个字符，时间复杂度为 O(1)，那么 Python 是怎么通过索引瞬间定位到指定字符的呢？显然是通过指针的偏移，用索引乘上每个字符占的字节数，得到偏移量，然后从头部向后偏移指定数量的字节即可，这样就能在定位到指定字符的同时还保证时间复杂度为 O(1)。 但是这需要一个前提：字符串中每个字符所占的大小必须是相同的，如果字符占的大小不同，比如有的占 1 字节、有的占 3 字节，显然就无法通过指针偏移的方式了。这个时候若还想准确定位的话，只能按顺序对所有字符都逐个扫描，但这样的话时间复杂度肯定不是 O(1)，而是 O(n)。 我们以 Go 为例，Go 字符串默认就是使用的 utf-8 编码。 package main import \"fmt\" func main() { s := \"古明地觉\" fmt.Println(s[2]) // 164 fmt.Println(string(s[2])) // ¤\n} 惊了，我们看到打印的并不是我们希望的结果。因为 Go 底层使用的是 utf-8 编码，不同的字符可能会占用不同的字节。但 Go 通过索引定位的时间复杂度也是 O(1)，所以定位的时候是以字节为单位、而不是字符。在获取的时候也只会获取一个字节，而不是一个字符。 所以 s[2] 在 Go 里面指的是第 3 个字节，而不是第 3 个字符，而汉字在 utf-8 编码下占 3 个字节，所以 s[2] 指的就是汉字古的第三个字节。我们看到打印的时候，该字节的值为 164。 s = \"古明地觉\"\nprint(s.encode(\"utf-8\")[2]) # 164 这就是采用 utf-8 编码带来的弊端，它无法让我们以 O(1) 的时间复杂度去准确地定位字符，尽管它在存储的时候更省内存。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 为什么不使用 utf-8 编码","id":"122","title":"为什么不使用 utf-8 编码"},"123":{"body":"Python 会使用 3 种编码来表示 unicode，所占字节大小分别是 1、2、4 字节。 因此 Python 在创建字符串的时候会先扫描，尝试使用占字节数最少的 Latin-1 编码存储，但是范围肯定有限。如果发现存储不下的字符，只能改变编码，使用 UCS2，然后继续扫描。但如果又发现 UCS2 也无法存储的字符，因为两个字节最多表示 65535 个不同的字符，那么会再次改变编码，使用 UCS4。UCS4 占四个字节，肯定能存下了。 一旦改变编码，字符串中的所有字符都会使用同样的编码，因为它们不具备可变长功能。比如字符串 \"hello 古明地觉\"，肯定都会使用 UCS2，不存在 \"hello \" 使用 Latin-1，\"古明地觉\" 使用 UCS2，因为一个字符串只能有一个编码。 当通过索引获取的时候，会将索引乘上每个字符占的字节数，这样就能跳到准确位置上，因为字符串的所有字符占的字节都是一样的，然后获取的时候也会获取指定的字节数。比如使用 UCS2 编码，那么定位到某个字符的时候，会取两个字节，这样才能表示一个完整的字符。 import sys # 此时全部是 ascii 字符，那么 Latin-1 编码可以存储\n# 所以结构体实例的元数据占 49 个字节\ns1 = \"hello\"\n# 有 5 个字符，一个字符一个字节，所以加一起是 54 个字节\nprint(sys.getsizeof(s1)) # 54 # 出现了汉字，那么 Latin-1 肯定存不下，于是使用 UCS2\n# 所以结构体实例的元数据占 74 个字节\n# 但是别忘了此时的英文字符也是 UCS2，所以也是一个字符两字节\ns2 = \"hello憨\"\n# 6 个字符，74 + 6 * 2 = 86\nprint(sys.getsizeof(s2)) # 86 # 这个牛逼了，UCS2 也存不下，只能 UCS4 存储了\n# 所以结构体实例的元数据占 76 个字节\ns3 = \"hello憨🍌\"\n# 此时所有字符一个占 4 字节，总共 7 个字符\n# 76 + 7 * 4 = 104\nprint(sys.getsizeof(s3)) # 104 除此之外，我们再举一个例子更形象地证明这个现象。 import sys s1 = \"a\" * 1000\ns2 = \"a\" * 1000 + \"🍑\" # 我们看到 s2 只比 s1 多了一个字符\n# 但是两者占的内存，s2 却将近是 s1 的 4 倍。\nprint(sys.getsizeof(s1)) # 1049\nprint(sys.getsizeof(s2)) # 4080 s2 和 s1 的差别只是 s2 比 s1 多了一个字符，但就是这么一个字符导致 s2 比 s1 多占了 3031 个字节。然而这 3031 个字节不可能是多出来的字符所占的大小，什么字符一个会占到三千多个字节，这是不可能的。 尽管如此，它也是罪魁祸首，但前面的 1000 个字符也是共犯。我们说 Python 会根据字符串选择不同的编码，s1 全部是 ASCII 字符，所以 Latin1 能存下，因此一个字符只占一个字节，所以大小就是 49 + 1000 = 1049。 对于 s2，Python 发现前 1000 个字符 Latin1 能存下，但不幸的是最后一个字符存不下，于是只能使用 UCS4。而字符串的所有字符只能有一个编码，为了保证索引查找的时间复杂度为 O(1)，前面一个字节就能存下的字符，也需要用 4 字节来存储，这是 Python 的设计策略。 而使用 UCS4，结构体的元数据会占 76 个字节，因此 s2 的大小就是 76 + 1001 * 4 = 4080。 # 74 + 7 * 2 = 88\n>>> sys.getsizeof(\"爷的青春回来了\") 88 # 76 + 7 * 4 = 104\n>>> sys.getsizeof(\"👴的青春回来了\")\n104 字符数量相同但是占用内存大小不同，相信原因你肯定能分析出来。 所以如果字符串中的所有字符都是 ASCII 字符，则使用 1 字节 Latin1 编码。Latin1 能表示前 256 个 unicode 字符，它支持多种拉丁语，如英语、瑞典语、意大利语、挪威语。但是它们不能存储非拉丁语言，比如汉语、日语、希伯来语、西里尔语。这是因为它们的码点（数字索引）定义在 1 字节（0 ~ 255）范围之外。 大多数自然语言的文字都采用 2 字节（UCS2）编码，但当字符串包含特殊符号、Emoji 或稀有语言时，则使用 4 字节（UCS4）编码。unicode 标准有将近 300 个块（范围），你可以在 0XFFFF 块之后找到 4 字节块。 假设我们有一个 10G 的 ASCII 文本，想把它加载到内存中，但如果在文本中插入一个表情符号，那么字符串的大小将增加 4 倍。这是一个巨大的差异，你可能会在实践当中遇到，比如处理 NLP 问题。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"😁\")) # 128513 所以最著名和最流行的 unicode 编码都是 utf-8，但 Python 不在内部使用它，而是使用 Latin1、UCS2、UCS4。至于原因我们上面已经解释的很清楚了，主要是字符串的索引是基于字符，而不是字节。 当一个字符串使用 utf-8 编码存储时，每个字符会根据自身选择一个合适的大小，这是一种存储效率很高的编码，但它有一个明显的缺点。由于每个字符的字节长度可能不同，就导致无法按照索引瞬间定位到单个字符，即便能定位，也无法定位准确。如果想准，那么只能逐个扫描所有字符。 假设要对使用 utf-8 编码的字符串执行一个简单的操作，比如 s[5]，就意味着解释器需要扫描每一个字符，直到找到需要的字符，这样效率是很低的。但如果是固定长度的编码就没有这样的问题，所以当 Latin1 存储的 \"hello\"，在和 UCS2 存储的 \"古明地觉\" 组合之后，整体每一个字符都会向大的方向扩展，变成 2 字节。 这样定位字符的时候，只需要将 索引 * 2 便可计算出偏移的字节数，然后跳转该字节数即可。但如果原来的 \"hello\" 还是 1字节，而汉字是 2 字节，那么只通过索引是不可能定位到准确字符的，因为不同类型的字符的大小不同，必须要扫描整个字符串才可以。但是扫描字符串，效率又比较低，所以 Python 内部才会使用这个方法，而不是使用 utf-8。 因此对于 Go 来讲，如果想像 Python 一样，那么需要这么做： package main import \"fmt\" func main() { s := \"hello古明地觉\" // 我们看到长度为 17，因为使用 utf-8 编码，并且 len 函数统计的是字节的数量 fmt.Println(s, len(s)) // hello古明地觉 17 // 如果想像 Python 一样，那么可以使用 Go 提供的 rune，相当于 int32 // 此时每个字符均使用 4 个字节，所以长度变成了 9 r := []rune(s) fmt.Println(string(r), len(r)) // hello古明地觉 9 // 虽然打印的内容是一样的，但此时每个字符都使用 4 字节存储 // 此时跳转会偏移 5 * 4 个字节，然后获取也会获取 4 个字节，因为一个字符占 4 个字节 fmt.Println(string(r[5])) // 古\n} 由于 utf-8 编码的 unicode 字符串里面的字符可能占用不同的字节，显然没办法实现 Python 字符串的索引查找效果，因此 Python 没有使用 utf-8 编码。 Python 的做法是让字符串的所有字符都占用相同的字节，先使用占用内存最少的 Latin1，不行的话再使用 UCS2，还不行则使用 UCS4。但不管使用哪种编码，都会确保每个字符占用的字节是一样的。至于原因上面分析的很透彻了，因为无论是索引还是切片，还是计算长度等等，都是基于字符来的，显然这也符合人类的思维习惯。","breadcrumbs":"29. Python 是怎么存储字符串的？ » Latin-1、UCS2、UCS4 该使用哪一种","id":"123","title":"Latin-1、UCS2、UCS4 该使用哪一种"},"124":{"body":"以上就是 Python 字符串的存储策略，它并没有使用最为流行的 utf-8，归根结底就在于这种编码不适合 Python 字符串。当然，我们在将字符串转成字节序列的时候，一般使用的都是 utf-8 编码。 下一篇文章来介绍字符串的底层实现，看看字符串在底层是如何设计的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 小结","id":"124","title":"小结"},"125":{"body":"我们之前提到，字符串采用不同的编码，底层的结构体实例的元数据所占用的内存是不一样的。其实本质上是，字符串会根据编码的不同，而选择不同的存储结构。 PyASCIIObject：字符串仅包含 ASCII 字符； PyCompactUnicodeObject：字符串包含非 ASCII 字符，但可以紧凑表示； PyUnicodeObject：通用结构，可以表达所有类型的字符串（该结构不做讨论）； 需要强调的是，虽然 ASCII 字符占一字节，但只有码点小于 128 的字符才叫 ASCII 字符。 下面我们来分析一下。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 楔子","id":"125","title":"楔子"},"126":{"body":"unicode 会根据编码的不同而分为以下几类。 // Include/cpython/unicodeobject.h\nenum PyUnicode_Kind { // 所有字符的码点均位于 U+0000 ~ U+00FF PyUnicode_1BYTE_KIND = 1, // 所有字符的码点均位于 U+0000 ~ U+FFFF // 且至少有一个大于 U+00FF PyUnicode_2BYTE_KIND = 2, // 所有字符的码点均位于 U+0000 ~ U+10FFFF // 且至少有一个大于 U+FFFF PyUnicode_4BYTE_KIND = 4\n}; 而采用不同的编码，每个字符的大小也是不同的。 // Include/unicodeobject.h\ntypedef uint32_t Py_UCS4;\ntypedef uint16_t Py_UCS2;\ntypedef uint8_t Py_UCS1; Python 有一个内置函数 ord，可以查看字符的码点。 如果码点位于 0 ~ 255，那么使用 Py_UCS1，占 1 字节； 如果码点位于 256 ~ 65535，那么使用 Py_UCS2，占 2 字节； 如果码点大于 65535，那么使用 Py_UCS4，占 4 字节； 通过字符的范围，选择一个最合适的存储单元，从而节省内存。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » unicode 分类","id":"126","title":"unicode 分类"},"127":{"body":"如果字符串只包含 ASCII 字符，即字符的码点均小于 128，那么底层使用 PyASCIIObject 进行存储。 // Include/cpython/unicodeobject.h\ntypedef struct { // 对象的公共头部 PyObject_HEAD // 字符串的长度，充当了 ob_size Py_ssize_t length; // 哈希值，初始为 -1 Py_hash_t hash; struct { // 字符串是否开启 intern 机制，后续介绍 unsigned int interned:2; // 类型，标识每个存储单元的大小，可以有以下几种 // PyUnicode_1BYTE_KIND // PyUnicode_2BYTE_KIND // PyUnicode_4BYTE_KIND unsigned int kind:3; // 字符串是否紧凑表示，它是针对内存分配方案而言的 /* 紧凑的字符串由 PyASCIIObject 和 PyCompactUnicodeObject 表示 它的特点是对象和文本缓冲区是结合的，只需要一个内存块 */ /* 非紧凑的字符串由 PyUnicodeObject 表示（不是本文的重点） 它的特点是对象和文本缓冲区是分离的，需要两个内存块 一个负责存储 PyUnicodeObject 对象，另一个负责存储文本缓冲区 */ unsigned int compact:1; // 字符串是否只包含 ASCII 字符，如果是则为 1, 否则为 0 // 虽然一个字节可表示的范围是 0 ~ 255，但只有 0 ~ 127 之间的才是 ASCII 字符 unsigned int ascii:1; // 对象布局是否已完全初始化，不用关注 unsigned int ready:1; // 注意上面的字段名后面跟着 :数字，这是 C 语言的位域 // 比如 interned:2 表示使用 unsigned int 的前 2 个位 // 所以 struct state 结构体总共占 4 字节，因为所有字段共用 4 字节内存 // 上面总共使用了 8 个位，显然这里的 :24 负责占满 32 个位 unsigned int :24; } state; // 缓存宽字符格式（wide character）的字符串，无需关注，在之后的版本会被移除 wchar_t *wstr;\n} PyASCIIObject; 那么问题来了，实际的字符串文本数据存在了什么地方，我们没看到结构体里面有哪个字段负责存储文本啊。答案很简单，字符串文本会直接跟在 PyASCIIObject 结构体实例的后面，也就是紧凑表示。 我们以字符串 \"miu\" 为例，看一下它的底层结构。 注：为优化内存访问效率，结构体字段会进行内存对齐，所以 state 后面会多出一个 4 字节的空洞。 再来分析一下为什么一个空字符串会占 49 个字节，因为 ob_refcnt、ob_type、length、hash、wstr 都是 8 字节，加起来 40 字节。而 state 是 4 字节，但又留下了 4 字节的空洞，加起来也是 8 字节，所以总共占 40 + 8 = 48 个字节。然后还有一个 '\\0'，所以还要加上一个 1，总共 49 字节。 而对于 \"miu\" 这个 unicode 字符串来说，占的总字节数就是 49 + 3 = 52。 >>> import sys\n>>> sys.getsizeof(\"abc\")\n52 当字符串只包含 ASCII 字符时，由 PyASCIIObject 结构体表示，大小等于 49 + 字符串长度。当然啦，我们也可以认为大小等于 48 + (字符串长度 + 1)，这样理解起来更直观一些。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyASCIIObject","id":"127","title":"PyASCIIObject"},"128":{"body":"如果字符串包含了非 ASCII 字符，那么由 PyCompactUnicodeObject 结构体表示，假设字符串中码点最大的字符的码点为 maxchar。 if maxchar < 128: struct = PyASCIIObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 1\nelif maxchar < 256: struct = PyCompactUnicodeObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 0\nelif maxchar < 65536: struct = PyCompactUnicodeObject kind = PyUnicode_2BYTE_KIND # 2 ascii = 0\nelse: struct = PyCompactUnicodeObject kind = PyUnicode_4BYTE_KIND # 4 ascii = 0 看一下 PyCompactUnicodeObject 的底层结构。 // Include/cpython/unicodeobject.h\ntypedef struct { PyASCIIObject _base; // 字符串的 utf-8 编码长度 Py_ssize_t utf8_length; // 字符串使用 utf-8 编码的结果，这里是缓存起来从而避免重复的编码运算 char *utf8; // 宽字符的数量 Py_ssize_t wstr_length;\n} PyCompactUnicodeObject; PyCompactUnicodeObject 相当于在 PyASCIIObject 的基础上增加了 3 个字段，那么它实例的大小是多少呢？由于新增的三个字段，每个都是 8 字节，并且字符串文本会紧跟在 PyCompactUnicodeObject 的后面，所以大小一目了然。 PyCompactUnicodeObject 实例的大小等于 48 + 24 + (字符串长度 + 1) * 每个字符的大小，即 72 + (字符串长度 + 1) * 每个字符的大小 因此以后在看到一个字符串时，我们可以很轻松地计算出它的大小。 import sys\n# 只包含 ASCII 字符，那么结构体使用 PyASCIIObject\n# 这样的字符串所占的内存大小为 48 + (字符串长度 + 1)\nonly_ascii = \"satori\"\n# 所以结果是 48 + (6 + 1) = 55 字节\nprint(sys.getsizeof(only_ascii))\n\"\"\"\n55\n\"\"\" # 包含非 ASCII 字符，结构体使用 PyCompactUnicodeObject\n# 但所有字符的码点均小于 256，因此编码仍使用 Py_UCS1\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1)\nnon_ascii_with_ucs1 = \"sator¡\"\n# 所以结果是 72 + (6 + 1) = 79 字节\nprint(sys.getsizeof(non_ascii_with_ucs1))\n\"\"\"\n79\n\"\"\" # 字符的码点达到了 256，但小于 65536，因此编码使用 Py_UCS2\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 2\n# 注意：因为编码使用 Py_UCS2，那么 \\0 也要占两个字节\nnon_ascii_with_ucs2 = \"憨pi\"\n# 所以结果是 72 + (3 + 1) * 2 = 80\nprint(sys.getsizeof(non_ascii_with_ucs2))\n\"\"\"\n80\n\"\"\" # 字符的码点达到了 65536，因此编码使用 Py_UCS4\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 4\n# 因为编码使用 Py_UCS4，那么 \\0 也要占 4 个字节\nnon_ascii_with_ucs4 = \"🍌君\"\n# 所以结果是 72 + (2 + 1) * 4 = 84\nprint(sys.getsizeof(non_ascii_with_ucs4))\n\"\"\"\n84\n\"\"\" 所以随着编码的不同，一个 Python 字符串的元数据（包含 '\\0'）会占据不同的大小，假设字符串中码点最大的字符的码点为 maxchar。 如果 maxchar < 128，那么采用 Latin-1 编码，结构体为 PyASCIIObject，元数据的大小为 48 + 1 = 49。 如果 128 <= maxchar < 256，那么采用 Latin-1 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 1 = 73。 如果 256 <= maxchar < 65536，那么采用 USC2 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 2 = 74。 如果 maxchar >= 65536，那么采用 USC4 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 4 = 76。 所以我们之前说根据编码的不同，字符串的额外部分可能占据 49、74、76字节，这个结论其实不够准确，还漏掉了一个 73。因为 128 <= maxchar < 256 的字符串虽然不是 ASCII 字符串，但它仍然使用 Latin-1 编码，所以 '\\0' 占的是 1 字节，而不是 2 字节和 4 字节。 下面通过画图来描述一下这几个字符串的底层结构，由于 ASCII 字符串已经说过了，这里就不再赘述了。 non_ascii_with_ucs1 = \"sator¡\" 注意结尾的是字符 ¡，不是 i。 每个字符占一字节，所以大小是 72 + 7= 79 字节，然后 kind 为 PyUnicode_1BYTE_KIND。 import sys print(sys.getsizeof(\"sator¡\")) # 79 只有所有的字符的码点都小于 128，才叫 ASCII 字符串。而 ¡ 的码点是 161，所以 \"sator¡\" 不是 ASCII 字符串，但它的每个字符仍然只需一个字节存储。 non_ascii_with_ucs2 = \"憨pi\" 每个字符占两字节，所以大小是 72 + 4 * 2 = 80 字节，然后 kind 为 PyUnicode_2BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"憨pi\"))\n80 non_ascii_with_ucs4 = \"🍌君\" 每个字符占四字节，所以大小是 72 + 3 * 4 = 84 字节，然后 kind 为 PyUnicode_4BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"🍌君\"))\n84 以上我们就讨论了不同编码的字符串的底层结构，以及内存计算方式。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyCompactUnicodeObject","id":"128","title":"PyCompactUnicodeObject"},"129":{"body":"我们再来看一下解释器是怎么为字符串申请内存的，这个过程会调用 PyUnicode_New 函数。 该函数接收一个 size 参数和 maxchar 参数，负责申请容纳 size 个字符的 unicode 对象。而 maxchar 表示所有字符的码点中最大的那一个，对象的每个字符占多大空间，则基于 maxchar 进行判断。 // Objects/unicodeobject.c PyObject *\nPyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)\n{ // 声明相关变量 PyObject *obj; PyCompactUnicodeObject *unicode; void *data; enum PyUnicode_Kind kind; int is_sharing, is_ascii; Py_ssize_t char_size; Py_ssize_t struct_size; // 如果 size 为 0，返回空字符串，注：空字符串是单例的 if (size == 0 && unicode_empty != NULL) { Py_INCREF(unicode_empty); return unicode_empty; } is_ascii = 0; is_sharing = 0; struct_size = sizeof(PyCompactUnicodeObject); // 如果 maxchar 小于 128，说明全部是 ASCII 字符 // 此时结构体使用 PyASCIIObject if (maxchar < 128) { kind = PyUnicode_1BYTE_KIND; // kind 为 1 char_size = 1; // 字符大小为 1 is_ascii = 1; // 是 ASCII 字符串 struct_size = sizeof(PyASCIIObject); // 结构体大小 } // 否则说明字符串包含非 ASCII 字符，那么 is_ascii 为 0 // 此时结构体一律使用 PyCompactUnicodeObject else if (maxchar < 256) { // 如果 maxchar 小于 256，那么 kind 依旧为 1，字符大小为 1 kind = PyUnicode_1BYTE_KIND; char_size = 1; } else if (maxchar < 65536) { // 如果 maxchar 小于 65536，那么 kind 为 2，字符大小为 2 kind = PyUnicode_2BYTE_KIND; char_size = 2; if (sizeof(wchar_t) == 2) is_sharing = 1; } else { // 否则说明要采用 4 字节存储，此时 kind 为 4，字符大小为 4 // 注意：maxchar 也是有范围的，不能超过 0x10ffff // 不过目前也没有哪个字符的码点能超过这个值 if (maxchar > MAX_UNICODE) { PyErr_SetString(PyExc_SystemError, \"invalid maximum character passed to PyUnicode_New\"); return NULL; } kind = PyUnicode_4BYTE_KIND; char_size = 4; if (sizeof(wchar_t) == 4) is_sharing = 1; } // size 不能小于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyUnicode_New\"); return NULL; } // (size + 1) * char_size + struct_size 不能超过 PY_SSIZE_T_MAX if (size > ((PY_SSIZE_T_MAX - struct_size) / char_size - 1)) return PyErr_NoMemory(); // 为 Unicode 对象申请内存，如果返回 NULL 则说明申请失败 // 申请的内存不仅包含结构体本身，还有 size + 1 个字符，每个字符大小为 char_size // 从这里就体现出 \"紧凑\" 的含义了，因为结构体和字符串文本是结合的 obj = (PyObject *) PyObject_MALLOC(struct_size + (size + 1) * char_size); if (obj == NULL) return PyErr_NoMemory(); // 初始化引用计数和类型 obj = PyObject_INIT(obj, &PyUnicode_Type); if (obj == NULL) return NULL; // 将 obj 转成 PyCompactUnicodeObject * unicode = (PyCompactUnicodeObject *)obj; // 注：存储字符串文本的内存（可以理解为一个数组）紧跟在结构体后面 // 而下面的变量 data 会指向数组的首元素 // 那么问题来了，这是怎么做到的呢？我们解释一下，顺便回顾一下 C 的指针 // 假设有一个 int * 类型的指针 a，即 a 指向一个 int // 而 C 指针是可以运算的，a + 1 会指向下一个 int // 当然更准确的说，a + 1 会向后偏移 sizeof(int) 个字节 // 同理，如果 a 的类型是 ssize_t *，那么 a + 1 会向后偏移 sizeof(ssize_t) 个字节 if (is_ascii) // 此时我们就知道这里的代码是做什么的了，如果 is_ascii 等于 1 // 说明结构体是 PyASCIIObject，将泛型指针 obj 转成 PyASCIIObject * // 加 1 之后会向后偏移 sizeof(PyASCIIObject) 个字节 // 正好指向跟在 PyASCIIObject 结构体实例尾部的首个字符 data = ((PyASCIIObject*)obj) + 1; else // 否则说明结构体是 PyCompactUnicodeObject // 那么 unicode + 1 之后会向后偏移 sizeof(PyCompactUnicodeObject) 个字节 // 同样指向跟在 PyCompactUnicodeObject 结构体实例尾部的首个字符 data = unicode + 1; // 将 length 字段设置为 size _PyUnicode_LENGTH(unicode) = size; // 将 hash 字段初始化为 -1 _PyUnicode_HASH(unicode) = -1; // 将 state.interned 字段设置为 0 _PyUnicode_STATE(unicode).interned = 0; // 将 state.kind 字段设置为 kind _PyUnicode_STATE(unicode).kind = kind; // 将 state.compact 字段设置为 1 _PyUnicode_STATE(unicode).compact = 1; // 将 state.ready 字段设置为 1 _PyUnicode_STATE(unicode).ready = 1; // 将 state.ascii 字段设置为 is_ascii _PyUnicode_STATE(unicode).ascii = is_ascii; // 如果 is_ascii 等于 1，即字符串为 ASCII 字符串 // 将字符数组索引为 size 的元素设置为 '\\0' if (is_ascii) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; } // 否则说明结构体是 PyCompactUnicodeObject，还要多初始化两个字段 // 将 utf8 设置为 NULL，将 utf8_length 设置为 0 else if (kind == PyUnicode_1BYTE_KIND) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; _PyUnicode_WSTR_LENGTH(unicode) = 0; unicode->utf8 = NULL; unicode->utf8_length = 0; } // 结构体是 PyCompactUnicodeObject，并且 kind 不等于 PyUnicode_1BYTE_KIND else { unicode->utf8 = NULL; unicode->utf8_length = 0; // 如果 kind 等于 PyUnicode_2BYTE_KIND，说明每个字符要占 2 字节 // 将 data 转成 Py_UCS2 *，此时会用两个字节存储 '\\0' if (kind == PyUnicode_2BYTE_KIND) ((Py_UCS2*)data)[size] = 0; // 否则说明 kind 等于 PyUnicode_4BYTE_KIND，每个字符要占 4 字节 // 将 data 转成 Py_UCS4 *，此时会用四个字节存储 '\\0' else ((Py_UCS4*)data)[size] = 0; if (is_sharing) { _PyUnicode_WSTR_LENGTH(unicode) = size; _PyUnicode_WSTR(unicode) = (wchar_t *)data; } else { _PyUnicode_WSTR_LENGTH(unicode) = 0; _PyUnicode_WSTR(unicode) = NULL; } }\n#ifdef Py_DEBUG unicode_fill_invalid((PyObject*)unicode, 0);\n#endif assert(_PyUnicode_CheckConsistency((PyObject*)unicode, 0)); // 最后返回泛型指针 PyObject * return obj;\n} 通过字符串的内存申请，我们应该对底层结构有了更深刻的认识，说白了就是采用不同的编码，每个字符占用不同数量的字节。 另外 PyUnicode_New 主要负责申请内存，包括结构体本身以及指定数量的字符，至于具体的字符是什么则不得而知。因此 PyUnicode_New 一般会被其它 API 调用，当调用 PyUnicode_New 申请完内存之后，再对字符数组初始化。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 字符串的内存申请","id":"129","title":"字符串的内存申请"},"13":{"body":"在前面的文章中我们说到，面向对象理论中的类和对象这两个概念在 Python 内部都是通过对象实现的。类是一种对象，称为类型对象，类实例化得到的也是对象，称为实例对象。但是对象在 Python 的底层是如何实现的呢？Python 解释器是基于 C 语言编写的 ，但 C 并不是一个面向对象的语言，那么它是如何实现 Python 的面向对象的呢？ 首先对于人的思维来说，对象是一个比较形象的概念，但对于计算机来说，对象却是一个抽象的概念。它并不能理解这是一个整数，那是一个字符串，计算机所知道的一切都是字节。通常的说法是：对象是数据以及基于这些数据所能进行的操作的集合。在计算机中，一个对象实际上就是一片被分配的内存空间，这些内存可能是连续的，也可能是离散的。 而 Python 的任何对象在 C 中都对应一个结构体实例，在 Python 中创建一个对象，等价于在 C 中创建一个结构体实例。所以 Python 的对象，其本质就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。 下面我们就来分析一下对象在 C 中是如何实现的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 楔子","id":"13","title":"楔子"},"130":{"body":"以上就是字符串的底层结构，虽然字符串作为最基础的数据结构被大量使用，但它的底层实现却并不简单。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 小结","id":"130","title":"小结"},"131":{"body":"上一篇文章我们介绍了字符串的底层结构，看到里面有一个 state 字段，该字段也是一个结构体，内部定义了很多的标志位。 如果字符串的 interned 标志位大于 0，那么虚拟机将为其开启 intern 机制。那什么是 intern 机制呢？在 Python 中，某些字符串也可以像小整数对象池里的整数一样，共享给所有变量使用，从而通过避免重复创建来降低内存使用、减少性能开销，这便是 intern 机制。 Python 的做法是在虚拟机内部维护一个全局字典，所有开启 intern 机制的字符串均会保存在这里，后续如果需要使用的话，会尝试在全局字典中获取，从而实现避免重复创建的功能。 另外 intern 机制也分为多种。 // Include/cpython/unicode.h\n#define SSTATE_NOT_INTERNED 0\n#define SSTATE_INTERNED_MORTAL 1\n#define SSTATE_INTERNED_IMMORTAL 2 解释一下这几个字段： SSTATE_NOT_INTERNED：字符串未开启 intern 机制； SSTATE_INTERNED_MORTAL：字符串开启了 intern 机制，但它不是永久驻留的，在某些情况下可能会被回收； SSTATE_INTERNED_IMMORTAL：字符串开启了 intern 机制，会永远存活于内存中； 这些字段定义了字符串在内存管理中的不同驻留状态，从未驻留、短暂驻留到永久驻留，帮助优化字符串的内存使用和管理。 而当一个字符串要开启 intern 机制时，会调用 PyUnicode_InternInPlace 函数，看一下它的逻辑。 // Objects/unicodeobject.c void\nPyUnicode_InternInPlace(PyObject **p)\n{ PyObject *s = *p; PyObject *t; // 类型检查，因为 intern 共享机制只能用在字符串对象上 // PyUnicode_Check(s) -> isinstance(s, str) // PyUnicode_CheckExact(s) -> type(s) is str if (s == NULL || !PyUnicode_Check(s)) return; if (!PyUnicode_CheckExact(s)) return; // 执行到这儿，说明 s 一定指向字符串，那么检测它是否已经开启了 intern 机制 // 这个函数的逻辑很简单，内部会获取 state.interned，看它是否大于 0 // 如果已经被 intern 机制处理了，那么直接返回 if (PyUnicode_CHECK_INTERNED(s)) return; // 所有开启 intern 机制的字符串，都会保存在 interned 字典中 // 如果 interned 字典为空，那么创建 if (interned == NULL) { interned = PyDict_New(); if (interned == NULL) { PyErr_Clear(); /* Don't leave an exception */ return; } } // 将字符串同时作为 key 和 value 保存在 interned 字典中，即开启 intern 机制 // PyDict_SetDefault 对应字典的 setdefault 方法 t = PyDict_SetDefault(interned, s, s); if (t == NULL) { PyErr_Clear(); return; } // 注意这里有一个让人混淆的地方，首先 t 和 s 都是 C 指针 // 如果 t != s，说明它们指向了不同的字符串，如果 t == s，说明它们指向的是同一个字符串 // 由于 s 同时作为 key 和 value，那么不管 s 指向的字符串是否在字典中已存在 // PyObject_RichCompare(t, s, Py_EQ) 永远为真，也就是 t 和 s 指向的字符串的值是相等的 // 只是当 t != s 时，说明它们指向的不是同一个字符串，但值相等 // 这也意味着字典中已经存在某个 key，它指向的字符串维护了相同的文本数据 // 那么增加 t 指向的字符串的引用计数，减少 s 指向的字符串的引用计数 if (t != s) { Py_INCREF(t); Py_SETREF(*p, t); return; } // 否则说明 t == s，即 s 在字典中不存在，那么开启 interned 机制 Py_REFCNT(s) -= 2; _PyUnicode_STATE(s).interned = SSTATE_INTERNED_MORTAL;\n} 估计很多人都以为 Python 在创建字符串时，会先检测该字符串是否已经存在，如果有，就不用创建新的，这样可以节省空间。但其实不是这样的，事实上节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。 对于任何一个字符串，Python 总是会为它申请内存，尽管创建出来的字符串在 interned 字典中已经存在了（有另外的字符串对象维护了相同的文本）。而这正是关键所在，通常 Python 在运行时创建了一个字符串对象（假设叫 temp）之后，基本上都会调用 PyUnicode_InternInPlace 对 temp 进行处理。 如果维护的值已经存在于 interned 字典中，那么 temp 指向的对象的引用计数就会减 1，然后会因引用计数为 0 而被销毁，只是昙花一现，然后归于湮灭。 所以现在我们就明白了 intern 机制，并不是说先判断是否存在，如果存在，就不创建。而是先创建，然后发现已经有其它的字符串维护了一个与之相同的文本数据，于是 intern 机制再将引用计数减一，导致引用计数为 0，最终被回收。 然后关于字符串对象的 intern 机制，还有一点需要注意。实际上，被 intern 机制处理过后的字符串分为两类，一类处于 SSTATE_INTERNED_IMMORTAL 状态，另一类处于 SSTATE_INTERNED_MORTAL 状态，这两种状态的区别在 unicode_dealloc 中可以清晰的看到。SSTATE_INTERNED_IMMORTAL 状态的字符串是永远不会被销毁的，它与解释器共存亡。 而 PyUnicode_InternInPlace 只能创建 SSTATE_INTERNED_MORTAL 的字符串对象，如果想创建 SSTATE_INTERNED_IMMORTAL 对象，必须通过另外的接口来强制改变 intern 状态。 void\nPyUnicode_InternImmortal(PyObject **p)\n{ PyUnicode_InternInPlace(p); if (PyUnicode_CHECK_INTERNED(*p) != SSTATE_INTERNED_IMMORTAL) { _PyUnicode_STATE(*p).interned = SSTATE_INTERNED_IMMORTAL; Py_INCREF(*p); }\n} 但是问题来了，什么样的字符串才会开启 intern 机制呢？ 1）如果字符串为 ASCII 字符串，并且长度不超过 4096，那么会开启 intern 机制。 >>> s1 = \"a\" * 4096\n>>> s2 = \"a\" * 4096\n# 会开启 intern 机制，s1 和 s2 指向同一个字符串\n>>> s1 is s2\nTrue # 长度超过了 4096，所以不会开启 intern 机制\n>>> s1 = \"a\" * 4097\n>>> s2 = \"a\" * 4097\n>>> s1 is s2\nFalse 2）如果一个字符串只有一个字符，并且码点小于 256（一个字节可以表示），那么也会开启 intern 机制。 >>> hex(128)\n'0x80'\n# s1 和 s2 指向同一个字符串，因为开启了 intern 机制\n>>> s1 = chr(128)\n>>> s2 = \"\\x80\"\n>>> s1 is s2\nTrue # ASCII 字符指的是码点小于 128 的字符，显然 s1 和 s2 不是 ASCII 字符串\n# 虽然码点小于 256，但长度不等于 1，所以不会开启 intern 机制\n>>> s1 = chr(128) + \"x\"\n>>> s2 = chr(128) + \"x\"\n>>> s1 is s2\nFalse 实际上，存储单个字符这种方式有点类似于 bytes 对象的缓存池。是的，正如整数有小整数对象池、bytes 对象有字符缓存池一样，字符串也有其对应的缓存池。 总之 intern 机制并不是大家想的那样：先检测字符串是否已经存在，如果有，就不用创建新的，从而节省内存。但其实不是这样的，节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。对于任何一个字符串，解释器总是会为它创建对应的结构体实例，但如果发现创建出来的实例在 intern 字典中已经存在了，那么再将它销毁。 最后关于 intern 机制，在 Python 里面可以通过 sys.intern 函数强制开启。 >>> s1 = \"憨pi-_-||\"\n>>> s2 = \"憨pi-_-||\"\n>>> s1 is s2\nFalse\n>>> >>> s1 = sys.intern(\"憨pi-_-||\")\n>>> s2 = sys.intern(\"憨pi-_-||\")\n>>> s1 is s2\nTrue 以上就是字符串的 intern 机制，下一篇文章来介绍字符串的相关操作是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"31. 字符串的 intern 机制是怎么一回事？","id":"131","title":"31. 字符串的 intern 机制是怎么一回事？"},"132":{"body":"本文来说一说字符串的操作，字符串支持哪些操作，取决于类型对象 str，所以我们来看看 str 在底层的定义。 // Objects/unicodeobject.c\nPyTypeObject PyUnicode_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"str\", /* tp_name */ sizeof(PyUnicodeObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* Slots */ (destructor)unicode_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ unicode_repr, /* tp_repr */ &unicode_as_number, /* tp_as_number */ &unicode_as_sequence, /* tp_as_sequence */ &unicode_as_mapping, /* tp_as_mapping */ // ...\n} bytes 对象和 str 对象的很多行为都是相似的，str 对象可以 encode 成 bytes 对象，bytes 对象可以 decode 成 str 对象。 看一下三个操作簇，字符串都支持，但根据 bytes 对象的经验，我们猜测 tp_as_number 里面实现的函数只有取模，也就是格式化。 // Objects/unicodeobject.c // 不出所料，只实现了一个取模\nstatic PyNumberMethods unicode_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ unicode_mod, /*nb_remainder*/\n}; // 我们看到和 bytes 对象是几乎一样的\n// 因为 str 对象和 bytes 都是不可变的变长对象，并且可以相互转化\n// 因此它们的行为是高度相似的\nstatic PySequenceMethods unicode_as_sequence = { (lenfunc) unicode_length, /* sq_length */ PyUnicode_Concat, /* sq_concat */ (ssizeargfunc) unicode_repeat, /* sq_repeat */ (ssizeargfunc) unicode_getitem, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyUnicode_Contains, /* sq_contains */\n}; //也和 bytes 对象一样\nstatic PyMappingMethods unicode_as_mapping = { (lenfunc)unicode_length, /* mp_length */ (binaryfunc)unicode_subscript, /* mp_subscript */ (objobjargproc)0, /* mp_ass_subscript */\n}; 下面我们就通过源码来考察一下。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 楔子","id":"132","title":"楔子"},"133":{"body":"获取字符串的长度会执行 unicode_length 函数。 // Objects/unicodeobject.c\nstatic Py_ssize_t\nunicode_length(PyObject *self)\n{ if (PyUnicode_READY(self) == -1) return -1; return PyUnicode_GET_LENGTH(self);\n} // Include/cpython/unicodeobject.h\n#define PyUnicode_GET_LENGTH(op) \\ (assert(PyUnicode_Check(op)), \\ assert(PyUnicode_IS_READY(op)), \\ ((PyASCIIObject *)(op))->length) 比较简单，没什么可说的，length 字段维护的是字符串的长度。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 获取字符串的长度","id":"133","title":"获取字符串的长度"},"134":{"body":"字符串相加会执行 PyUnicode_Concat 函数，将两个字符串组合成一个新的字符串。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Concat(PyObject *left, PyObject *right)\n{ // 参数 left 和 right 指向两个要相加的字符串 // result 则指向相加之后的字符串 PyObject *result; // 还记得这个 Py_UCS4 吗，它是一个无符号 32 位整型 Py_UCS4 maxchar, maxchar2; // left 的长度、right 的长度、相加之后的长度 Py_ssize_t left_len, right_len, new_len; // 必须是两个字符串相加 if (ensure_unicode(left) < 0) return NULL; if (!PyUnicode_Check(right)) { PyErr_Format(PyExc_TypeError, \"can only concatenate str (not \\\"%.200s\\\") to str\", right->ob_type->tp_name); return NULL; } if (PyUnicode_READY(right) < 0) return NULL; // 如果 left 指向空字符串，直接返回 right if (left == unicode_empty) return PyUnicode_FromObject(right); // 如果 right 指向空字符串，直接返回 left if (right == unicode_empty) return PyUnicode_FromObject(left); // 获取两个字符串的长度 left_len = PyUnicode_GET_LENGTH(left); right_len = PyUnicode_GET_LENGTH(right); // 如果相加的之后的长度超过了 PY_SSIZE_T_MAX，那么报错 if (left_len > PY_SSIZE_T_MAX - right_len) { PyErr_SetString(PyExc_OverflowError, \"strings are too large to concat\"); return NULL; } // 计算相加之后的字符串的长度 new_len = left_len + right_len; // 解释一下 PyUnicode_MAX_CHAR_VALUE，它的逻辑很简单 /* 如果是 ASCII 字符串，返回 0x7f * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0xff * 如果 kind 等于 PyUnicode_2BYTE_KIND，返回 0xffff * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0x10ffff */ // 所以该函数计算的就是字符串使用的编码所能表示的最大范围 maxchar = PyUnicode_MAX_CHAR_VALUE(left); maxchar2 = PyUnicode_MAX_CHAR_VALUE(right); // 显然要取 maxchar 和 maxchar2 之间两者较大的那一个 maxchar = Py_MAX(maxchar, maxchar2); // PyUnicode_New 我们之前介绍过，它负责为字符串申请内存 // new_len 表示要容纳多少个字符 // maxchar 表示字符的最大码点，内部会基于 maxchar 选择一个合适的编码 result = PyUnicode_New(new_len, maxchar); if (result == NULL) return NULL; // _PyUnicode_FastCopyCharacters 负责字符串之间的拷贝，它的原型如下： /* void _PyUnicode_FastCopyCharacters(PyObject *to, Py_ssize_t to_start, PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many) 如果用 Python 代码举例的话，那么该函数所做的事情就等价于如下： for i in range(how_many): to[to_start + i] = from[from_start + i] */ // 相当于 result[0: left_len] = left[0: left_len] _PyUnicode_FastCopyCharacters(result, 0, left, 0, left_len); // 相当于 result[left_len: left_len + right_len] = right[0: right_len] _PyUnicode_FastCopyCharacters(result, left_len, right, 0, right_len); assert(_PyUnicode_CheckConsistency(result, 1)); return result;\n} 可以看到逻辑还是很清晰的，不过和 bytes 对象不同，字符串没有实现缓冲区。但是在操作上，和 bytes 对象是类似的，如果有大量的字符串相加，那么效率会非常低下，官方建议是通过 join 的方式。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的相加","id":"134","title":"字符串的相加"},"135":{"body":"序列型对象除了拥有 tp_as_sequence 里面的方法之外，还可以有很多自定义方法，比如字符串可以转大小写，列表可以追加元素等等。下面来聊一聊字符串的自定义方法，在介绍类型对象的时候说过，实例对象的自定义方法都会放在类型对象的 tp_methods 字段里面。 tp_methods 字段的类型是 PyMethodDef 结构体数组，一个 PyMethodDef 结构体实例对应一个可调用方法。那么 PyMethodDef 长什么样子呢？ // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 包含具体实现的 C 函数 PyCFunction ml_meth; // 函数的参数类型 // 比如函数接收多少参数，是否支持关键字参数， // 是不是静态方法、类方法等等，这些都需要通过 ml_flags 指定 int ml_flags; // 函数的 docstring const char *ml_doc; }; 字符串的自定义方法非常多，我们先从 Python 的角度罗列一下，然后再挑几个看一下源码实现。 # 字符串转小写\nprint(\"ABC\".lower()) # abc # 字符串转大写\nprint(\"abc\".upper()) # ABC # 每个单词首字母大写，其它字母小写\nprint(\"my GRIL\".title()) # My Gril # 第一个单词首字母大写，其它字母小写\nprint(\"MY GIRL\".capitalize()) # My girl # 从字符两端开始去除指定的字符，比如位于 \"001\" 的字符会被去除\nprint(\"001古明地觉 1 号001\".strip(\"001\")) # 古明地觉 1 号\n# 也可以只从一端去除\nprint(\"001古明地觉 1 号001\".lstrip(\"001\")) # 古明地觉 1 号001\nprint(\"001古明地觉 1 号001\".rstrip(\"001\")) # 001古明地觉 1 号 # 查找指定的子串，返回子串第一次出现的位置\nprint(\"abcabcabc\".index(\"bca\")) # 1\n# 查找时也支持指定范围，比如从索引为 2 的位置开始查找\nprint(\"abcabcabc\".index(\"bca\", 2)) # 4 # index 方法如果在没有找到指定的子串时，会抛出 ValueError:\n# 如果不希望报错，那么可以使用 find，当字符串不存在时会返回 -1\nprint(\"hello\".find(\"ll\")) # 2\nprint(\"hello\".find(\"lll\")) # -1\n# find 也支持指定查找范围，并且是从左往右查找\n# 如果使用 rfind，则可以实现从右往左查找，同理还有 rindex\nprint(\"abc abc\".find(\"abc\")) # 0\nprint(\"abc abc\".rfind(\"abc\")) # 4 # 统计指定子串的数量\nprint(\"abc abc abc\".count(\"abc\")) # 3 # 是否以某个字符串开头\nprint(\"Hello\".startswith(\"Hel\")) # True\nprint(\"Hello\".startswith(\"hel\")) # False # 是否以某个字符串结尾\nprint(\"world\".endswith(\"rld\")) # True\nprint(\"world\".endswith(\"rlD\")) # False # 按照指定字符串进行分割，并支持传入 maxsplit 参数指定最大分割次数\nprint(\"a-b-c-d-e\".split(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".split(\"-\", 2)) # ['a', 'b', 'c-d-e']\n# 如果不传递参数，那么会默认按照空白符（包含空格、Tab、换行等等）分隔\nprint(\"a \\n b \\tc\".split()) # ['a', 'b', 'c']\n# 还可以从右向左分割，当然在不指定 maxsplit 参数时，效果和 split 一样\nprint(\"a-b-c-d-e\".rsplit(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".rsplit(\"-\", 2)) # ['a-b-c', 'd', 'e'] # 等价于 .split(\"\\n\")\nprint(\"a b\\nc\".splitlines()) # ['a b', 'c'] # 按照指定子串进行分割，返回一个三元组：(子串之前的部分, 子串, 子串之后的部分)\nprint(\"abcxxdef\".partition(\"xx\")) # ('abc', 'xx', 'def')\n# 当子串不存在时，会返回 (字符串本身, \"\"， \"\")\nprint(\"abc\".partition(\"xx\")) # ('abc', '', '') # 大小写交换\nprint(\"Hello World\".swapcase()) # hELLO wORLD # 对指定子串进行替换\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\")) # ABC ABC ABC\n# 也可以指定最大替换次数\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\", 2)) # ABC ABC abc # 和 replace 作用相似，也是用来替换字符串指定部分\n# 将 a 替换成 abc，将 x 替换成 xyz\ntrans = str.maketrans({\"a\": \"abc\", \"x\": \"xyz\"})\nprint(\"aaxx\".translate(trans)) # abcabcxyzxyz\n# 如果给 str.maketrans 只传一个参数，那么要传字典，并且 key 必须是单字符\n# 如果给 str.maketrans 传递两个参数，那么两个参数必须是等长的字符串\ntrans = str.maketrans(\"abc\", \"ABC\")\n# a -> A，b -> B，c -> C\nprint(\"abccc\".translate(trans)) # ABCCC\n# 如果传三个参数，那么第三个参数也要是字符串\n# 此时在替换的时候，还会去除掉位于 \"def\" 中的字符\ntrans = str.maketrans(\"abc\", \"ABC\", \"def\")\nprint(\"abcdefabc\".translate(trans)) # ABCABC 这些都属于基础内容了，我们挑几个看一下源码实现。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的自定义方法","id":"135","title":"字符串的自定义方法"},"136":{"body":"字符串在相加时会创建一个新的字符串，所以如果有大量的字符串相加，那么效率会很低下。面对这种情况，官方的建议是通过 join 方法。 字符串的 join 方法在底层对应 PyUnicode_Join 函数。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Join(PyObject *separator, PyObject *seq)\n{ PyObject *res; // 拼接结果 PyObject *fseq; // 拼接的字符串的数量 Py_ssize_t seqlen; // 总长度 PyObject **items; // PyObject * 数组首元素的地址 // 遍历参数 seq，将里面的每个字符串拿出来放在列表中 // 如果 seq 本身就是列表或元组，那么直接返回 seq fseq = PySequence_Fast(seq, \"can only join an iterable\"); if (fseq == NULL) { return NULL; } // 列表或元组对应的结构体内部都有一个 ob_item 字段 // 该字段是一个 PyObject * 类型的数组，负责保存具体的元素 // 该函数会拿到 ob_item 数组，并赋值给 items items = PySequence_Fast_ITEMS(fseq); // 获取要拼接的字符串的数量 seqlen = PySequence_Fast_GET_SIZE(fseq); // 调用 _PyUnicode_JoinArray 进行拼接 res = _PyUnicode_JoinArray(separator, items, seqlen); Py_DECREF(fseq); return res;\n} 核心在 _PyUnicode_JoinArray 函数里面，该函数的逻辑很长，但很简单。就是获取要拼接的每一个字符串的长度，然后加在一起，并取最大的存储单元，然后一次性申请对应的内存空间，再逐一进行拷贝。所以拷贝是避免不了的，+ 这种方式导致低效率的主要原因就在于大量临时字符串的创建和销毁。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 join","id":"136","title":"字符串的 join"},"137":{"body":"在 Python 里面可以调用字符串的 encode 方法，得到 bytes 对象。那么它在底层是如何实现的呢？ // Objects/unicodeobject.c\nPyObject *\nPyUnicode_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors)\n{ PyObject *v; char buflower[11]; // unicode 参数要指向一个字符串 if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } // 如果不指定编码，那么使用 UTF-8 if (encoding == NULL) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果指定了编码，那么进行判断 if (_Py_normalize_encoding(encoding, buflower, sizeof(buflower))) { char *lower = buflower; /* Fast paths */ // 快分支，判断是否是 UTF-* 系列 if (lower[0] == 'u' && lower[1] == 't' && lower[2] == 'f') { lower += 3; if (*lower == '_') { /* Match \"utf8\" and \"utf_8\" */ lower++; } // 如果是 UTF-8 if (lower[0] == '8' && lower[1] == 0) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果是 UTF-16 else if (lower[0] == '1' && lower[1] == '6' && lower[2] == 0) { return _PyUnicode_EncodeUTF16(unicode, errors, 0); } // 如果是 UTF-32 else if (lower[0] == '3' && lower[1] == '2' && lower[2] == 0) { return _PyUnicode_EncodeUTF32(unicode, errors, 0); } } // 否则判断是否是 ascii、latin1、iso8859-1 等编码 else { if (strcmp(lower, \"ascii\") == 0 || strcmp(lower, \"us_ascii\") == 0) { return _PyUnicode_AsASCIIString(unicode, errors); }\n#ifdef MS_WINDOWS else if (strcmp(lower, \"mbcs\") == 0) { return PyUnicode_EncodeCodePage(CP_ACP, unicode, errors); }\n#endif else if (strcmp(lower, \"latin1\") == 0 || strcmp(lower, \"latin_1\") == 0 || strcmp(lower, \"iso_8859_1\") == 0 || strcmp(lower, \"iso8859_1\") == 0) { return _PyUnicode_AsLatin1String(unicode, errors); } } } // 如果以上编码都不是，那么执行通用逻辑 _PyCodec_EncodeText v = _PyCodec_EncodeText(unicode, encoding, errors); if (v == NULL) return NULL; /* The normal path */ if (PyBytes_Check(v)) return v; /* If the codec returns a buffer, raise a warning and convert to bytes */ if (PyByteArray_Check(v)) { int error; PyObject *b; error = PyErr_WarnFormat(PyExc_RuntimeWarning, 1, \"encoder %s returned bytearray instead of bytes; \" \"use codecs.encode() to encode to arbitrary types\", encoding); if (error) { Py_DECREF(v); return NULL; } b = PyBytes_FromStringAndSize(PyByteArray_AS_STRING(v), PyByteArray_GET_SIZE(v)); Py_DECREF(v); return b; } PyErr_Format(PyExc_TypeError, \"'%.400s' encoder returned '%.400s' instead of 'bytes'; \" \"use codecs.encode() to encode to arbitrary types\", encoding, Py_TYPE(v)->tp_name); Py_DECREF(v); return NULL;\n} 由于现在的主流编码是 utf-8，所以绝大部分情况都会执行 _PyUnicode_AsUTF8String 函数，我们看一下它的逻辑。 // Objects/unicodeobject.c\nPyObject *\n_PyUnicode_AsUTF8String(PyObject *unicode, const char *errors)\n{ return unicode_encode_utf8(unicode, _Py_ERROR_UNKNOWN, errors);\n} static PyObject *\nunicode_encode_utf8(PyObject *unicode, _Py_error_handler error_handler, const char *errors)\n{ enum PyUnicode_Kind kind; void *data; Py_ssize_t size; if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } if (PyUnicode_READY(unicode) == -1) return NULL; // 如果是 ASCII 字符串，那么直接获取每个字符的码点，创建 bytes 对象 if (PyUnicode_UTF8(unicode)) return PyBytes_FromStringAndSize(PyUnicode_UTF8(unicode), PyUnicode_UTF8_LENGTH(unicode)); // 获取字符串的 kind kind = PyUnicode_KIND(unicode); // 获取首字符的地址，首字符紧跟在结构体后面 data = PyUnicode_DATA(unicode); // 获取字符串的长度 size = PyUnicode_GET_LENGTH(unicode); // 判断 kind 种类 switch (kind) { default: Py_UNREACHABLE(); case PyUnicode_1BYTE_KIND: // 基于不同 kind 调用不同的函数 assert(!PyUnicode_IS_ASCII(unicode)); return ucs1lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_2BYTE_KIND: return ucs2lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_4BYTE_KIND: return ucs4lib_utf8_encoder(unicode, data, size, error_handler, errors); }\n} 整个过程还是我们之前说的，通过 utf-8 编码将每个字符转成对应的编号，组合起来得到的就是 bytes 对象。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 encode","id":"137","title":"字符串的 encode"},"138":{"body":"到目前为止，我们就说完了字符串相关的内容。必须要强调的是，字符串没有想象中的那么简单，而在 CPython 里面，字符串的源码将近两万行。 如果你还对字符串的其它操作感兴趣，想看看它的具体实现，可以自己深入源码探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 小结","id":"138","title":"小结"},"139":{"body":"本篇文章来分析一下列表，在初学列表的时候，可能书上会告诉你列表就是一个大仓库，什么都可以存放。但在最开始的几个章节中，我们花了很大的笔墨介绍了 Python 的对象，并明白了变量的本质。所以到现在列表已经没有什么好神秘的了，它里面存放的元素其实都是泛型指针 PyObject *。 并且根据我们使用列表的经验，可以得出以下两个结论： 每个列表的元素个数可以不一样，所以它是一个变长对象 可以对列表进行添加、删除、修改等操作，所以它是一个可变对象","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 楔子","id":"139","title":"楔子"},"14":{"body":"Python 一切皆对象，而所有的对象都拥有一些共同的信息（也叫头部信息），这些信息位于 PyObject 中，它是 Python 对象机制的核心，下面来看看它的定义。 // Include/object.h typedef struct _object { _PyObject_HEAD_EXTRA Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 首先解释一下结构体里面的 _PyObject_HEAD_EXTRA，这是一个宏，定义如下。 // Include/object.h // 如果定义了宏 Py_TRACE_REFS\n#ifdef Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 会展开成如下两个字段\n// 显然程序中创建的对象会组成一个双向链表\n#define _PyObject_HEAD_EXTRA \\ struct _object *_ob_next; \\ struct _object *_ob_prev;\n// 用于将 _ob_next 和 _ob_prev 初始化为空\n#define _PyObject_EXTRA_INIT 0, 0,\n// 否则说明没有定义宏 Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 和 _PyObject_EXTRA_INIT 不会有任何作用\n#else\n#define _PyObject_HEAD_EXTRA\n#define _PyObject_EXTRA_INIT\n#endif 所以如果定义了宏 Py_TRACE_REFS，那么展开之后 PyObject 就是下面这样。 typedef struct _object { PyObject *_ob_next; PyObject *_ob_prev; Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 但 Py_TRACE_REFS 一般只在编译调试的时候会开启，我们从官网下载的都是 Release 版本，不包含这个宏，因此这里我们也不考虑它。所以 PyObject 最终就等价于下面这个样子： typedef struct _object { Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 所以 PyObject 里面包含了两个字段，分别是 ob_refcnt 和 ob_type。 ob_refcnt 表示对象的引用计数，当对象被引用时，ob_refcnt 会自增 1；引用解除时，ob_refcnt 会自减 1。而当对象的引用计数为 0 时，则会被回收。 那么在哪些情况下，引用计数会加 1 呢？哪些情况下，引用计数会减 1 呢？ 引用计数加 1 的情况： 对象被创建：比如 name = \"古明地觉\"，此时对象就是 \"古明地觉\" 这个字符串，创建成功时它的引用计数为 1； 变量传递使得对象被新的变量引用：比如 name2 = name； 引用该对象的某个变量作为参数传递到一个函数或者类中：比如 func(name)； 引用该对象的某个变量作为元组、列表、集合等容器的元素：比如 lst = [name]； 引用计数减 1 的情况： 引用该对象的变量被显式地销毁：del name； 引用该对象的变量指向了别的对象：name = \"\"； 引用该对象的变量离开了它的作用域，比如函数的局部变量在函数执行完毕时会被删除； 引用该对象的变量所在的容器被销毁，或者变量从容器里面被删除； 因为变量只是一个和对象绑定的符号，更接地气一点的说法就是，变量是个便利贴，贴在指定的对象上面。所以 del 变量 并不是删除变量指向的对象，而是删除变量本身，可以理解为将对象身上的便利贴给撕掉了，其结果就是对象的引用计数减一。至于对象是否被删除（回收）则是解释器判断其引用计数是否为 0 决定的，为 0 就删，不为 0 就不删，就这么简单。 然后看一下字段 ob_refcnt 的类型，该类型为 Py_ssize_t，它是 ssize_t 的别名，在 64 位机器上等价于 int64。因此一个对象的引用计数不能超过 int64 所能表示的最大范围。但很明显，如果不费九牛二虎之力去写恶意代码，是不可能超过这个范围的。 说完了 ob_refcnt，再来看看 PyObject 的另一个字段 ob_type，相信你能猜到它的含义。对象是有类型的，类型对象描述实例对象的行为，而 ob_type 存储的便是对应的类型对象的指针，所以类型对象在底层是一个 struct _typeobject 结构体实例。另外 struct _typeobject 还有一个类型别名叫 PyTypeObject，关于类型对象，我们后续再聊。 以上就是 PyObject，它的定义非常简单，就一个引用计数和一个类型对象的指针。这两个字段的大小都是 8 字节，所以一个 PyObject 结构体实例的大小是 16 字节。由于 PyObject 是所有对象都具有的，换句话说就是所有对象对应的结构体都内嵌了 PyObject，因此你在 Python 里面看到的任何一个对象都有引用计数和类型这两个属性。 >>> num = 666 >>> sys.getrefcount(num)\n2\n>>> num.__class__\n<class 'int'> >>> sys.getrefcount(sys)\n56\n>>> sys.__class__\n<class 'module'> >>> sys.getrefcount(sys.path)\n2\n>>> sys.path.__class__\n<class 'list'> >>> def foo(): pass\n... >>> sys.getrefcount(foo)\n2\n>>> foo.__class__\n<class 'function'> 引用计数可以通过 sys.getrefcount 函数查看，类型可以通过 type(obj) 或者 obj.__class__ 查看。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 对象的地基：PyObject","id":"14","title":"对象的地基：PyObject"},"140":{"body":"列表在底层由 PyListObject 结构体表示，看一下它长什么样子。 // Include/listobject.h\ntypedef struct { PyObject_VAR_HEAD /* Vector of pointers to list elements. list[0] is ob_item[0], etc. */ PyObject **ob_item; /* ob_item contains space for 'allocated' elements. The number * currently in use is ob_size. * Invariants: * 0 <= ob_size <= allocated * len(list) == ob_size * ob_item == NULL implies ob_size == allocated == 0 * list.sort() temporarily sets allocated to -1 to detect mutations. * * Items must normally not be NULL, except during construction when * the list is not yet visible outside the function that builds it. */ Py_ssize_t allocated;\n} PyListObject; 我们看到里面有如下字段： PyObject_VAR_HEAD：变长对象的公共头部信息； ob_item：一个二级指针，指向 PyObject * 数组的首元素，这个指针数组保存的便是对象的指针，而操作数组都是通过 ob_item 来进行操作的； allocated：容量，我们知道列表底层使用了 C 的数组，而底层数组的长度就是列表的容量； 列表之所以要有容量的概念，是因为列表可以动态添加元素，但底层的数组在创建完毕之后，其长度却是固定的。所以当添加新元素时，发现数组已经满了，这个时候只能申请一个更长的数组，同时把原来数组中的元素依次拷贝到新数组里面（这一过程就是列表的扩容），然后再将新元素添加进去。 但是问题来了，总不可能每添加一个元素，就申请一次数组、将所有元素都拷贝一次吧。所以列表在扩容的时候，会将数组申请的长一些，从而在添加元素的时候不用每次都申请新的数组。 这便是列表的结构示意图，我们看到底层数组的长度为 4，说明此时列表的容量为 4。但是里面有 3 个 PyObject * 指针，说明列表的 ob_size 是 3，或者说列表里面有 3 个元素。 如果这个时候我们往列表中 append 一个元素，那么会将这个新元素设置在数组索引为 ob_size 的位置、或者说第四个位置。一旦设置完，ob_size 会自动加 1，因为 ob_size 要和列表的长度保持一致。 列表的容量是 4，但此时长度也达到了 4，所以列表的长度、或者说元素个数已经达到了容量。这说明当下一次 append 的时候，已经没有办法再容纳新的元素了。当然最直观的还是这里的底层数组，很明显全都占满了。那这个时候如果想再接收新的元素的话，要怎么办呢？显然只能扩容了。 原来的容量是 4，长度也是 4，当再来一个新元素的时候由于没有位置了，所以要扩容。但扩容的时候肯定会将容量申请的大一些、即底层数组申请的长一些，具体申请多长，Python 内部有一个公式，我们后面会说。总之申请的新的底层数组长度是 8，那么说明列表的容量就变成了 8。 新数组申请之后，将原来旧数组中的 PyObject * 按照顺序依次拷贝过去，再让 ob_item 指向新数组。然后把要添加的元素设置在新数组中索引为 ob_size 的位置、即第 5 个位置，并将 ob_size 加 1。最后将旧数组释放掉。 以上便是列表底层在扩容的时候所经历的过程。 由于扩容会申请新数组，然后将旧数组的元素拷贝到新数组中，所以这是一个时间复杂度为 O(n) 的操作。而 append 可能会导致列表扩容，因此 append 最坏情况下也是一个 O(n) 的操作，只不过扩容不会频繁发生，所以 append 方法的平均时间复杂度还是 O(1)。 另外我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了指向这个指针数组首元素的二级指针。显然我们添加、删除、修改元素等操作，都是通过 ob_item 二级指针来间接操作指针数组。 至于这么做的原因，我们在介绍 Python 对象的时候就说过了，不记得了的话，可以回去翻一翻。 所以底层对应的 PyListObject 实例的大小其实是不变的，因为指针数组没有存在 PyListObject 里面。但 Python 在计算内存大小的时候是会将这个指针数组也算进去的，所以列表的大小是可变的。 而且我们知道，列表在 append 之后地址是不变的，至于原因上面的几张图已经解释得很清楚了。 如果长度没有达到容量，那么 append 其实就是往底层数组中设置了一个新元素。如果达到容量了，那么会扩容，但扩容只是申请一个新的指针数组，然后让 ob_item 重新指向罢了。所以底层的指针数组会变，但是 PyListObject 结构体实例本身是没有变化的，因此列表在执行 append、extend、pop、insert 等操作时，地址不会发生变化。 下面再来看看列表所占的内存大小是怎么算的，首先 PyListObject 里面的 PyObject_VAR_HEAD 占 24 字节，ob_item 占 8 字节，allocated 占 8 字节，总共 40 字节。但是不要忘记，在计算列表大小的时候，ob_item 指向的指针数组也要算在内。所以：列表的大小 = 40 + 8 * 指针数组长度（或者说列表容量）。注意是指针数组长度，可不是列表长度，因为数组一旦申请了，不管你用没用，大小就摆在那里了。就好比你租了间房子，就算不住，房租该交还是得交。 # 显然一个空数组占 40 个字节\nprint([].__sizeof__()) # 40 # 40 + 3 * 8 = 64\nprint([1, 2, \"x\" * 1000].__sizeof__()) # 64\n# 虽然里面有一个长度为 1000 的字符串\n# 但我们说列表存放的都是指针，所以大小都是 8 字节 # 注意：我们通过 lst = [1, 2, 3] 这种方式创建列表的话\n# 不管内部元素有多少个, 其 ob_size 和 allocated 都是一样的\n# 只有当列表在添加元素的时候发现容量不够了才会扩容\nlst = list(range(10))\n# 40 + 10 * 8 = 120\nprint(lst.__sizeof__()) # 120 # 长度为 4，此时容量也是 4\nlst = [\"巭\", \"孬\", \"嫑\", \"睡觉\"]\n# 大小为 40 + 4 * 8 = 72\nprint(lst.__sizeof__()) # 72\n# 添加一个元素\nlst.append(\"觉得睡啊\")\n# 大小变成了 40 + 8 * 8 = 104\n# 说明当发生扩容时，底层数据可以容纳 8 个元素\nprint(lst.__sizeof__()) # 104 关于列表的长度和容量的关系，以及扩容的规则，我们后续再聊。总之目前我们知道列表的大小是怎么计算的，以及为什么列表在通过索引定位元素的时候，时间复杂度是 O(1)。因为列表存储的都是对象的指针，不管对象有多大，其指针大小是固定的，都是 8 字节，通过索引可以瞬间计算出偏移量。 print([1, 2, 3].__sizeof__()) # 64\nprint([[1, 2, 3]].__sizeof__()) # 48 相信上面这个结果，你肯定能分析出原因。因为第一个列表中有 3 个指针，所以大小是 40 + 24 = 64。而第二个列表中有一个指针，所以是 40 + 8 = 48。用一张图来展示一下 [1, 2, 3] 和 [[1, 2, 3]] 的底层结构，看看它们之间的区别： 到此相信你已经彻底掌握列表的结构了，那么下一篇文章我们来介绍一下列表的长度和容量之间的关系，以及扩容是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 列表的底层结构","id":"140","title":"列表的底层结构"},"141":{"body":"本篇文章来说一说列表的扩容，我们知道列表在添加元素时，如果发现底层的指针数组已经满了，那么会进行扩容，申请一个更大的数组。 下面就来看看底层是怎么实现的，相关操作都位于 Objects/listobject.c 中。 static int\nlist_resize(PyListObject *self, Py_ssize_t newsize)\n{ // 参数 self 就是列表，newsize 指的是元素在添加之后的 ob_size // 比如列表的 ob_size 和容量都是 4，append 的时候发现容量不够 // 所以会扩容，那么这里的 newsize 就是 5 // 如果是 extend 添加 3 个元素，那么这里的 newsize 就是 7 // 当然 list_resize 这个函数不仅可以扩容，也可以缩容 // 假设列表原来有 1000 个元素，这个时候将列表清空了，那么容量肯定缩小，不然会浪费内存 // 如果清空了列表，那么这里的 newsize 显然就是 0 // 二级指针，指向指针数组的首元素 PyObject **items; // 新的容量，以及新的指针数组的内存大小 size_t new_allocated, num_allocated_bytes; // 获取原来的容量 Py_ssize_t allocated = self->allocated; // 如果 newsize 达到了容量的一半，但还没有超过容量 // 那么意味着 newsize、或者新的 ob_size 和容量是匹配的 // 所以容量不会变化，直接将列表的 ob_size 设置为 newsize 即可 if (allocated >= newsize && newsize >= (allocated >> 1)) { assert(self->ob_item != NULL || newsize == 0); Py_SIZE(self) = newsize; return 0; } // 走到这里说明容量和 newsize 不匹配了，所以要进行扩容或者缩容 // 因此要申请新的底层数组，那么长度是多少呢？ // 这里给出了公式，一会儿我们可以通过 Python 进行测试 new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6); // 容量也是有范围的，乘上 8 字节不能超过 PY_SSIZE_T_MAX if (new_allocated > (size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)) { PyErr_NoMemory(); return -1; } // 如果 newsize 为 0，那么容量也为 0 if (newsize == 0) new_allocated = 0; // 分配内存 num_allocated_bytes = new_allocated * sizeof(PyObject *); items = (PyObject **)PyMem_Realloc(self->ob_item, num_allocated_bytes); if (items == NULL) { PyErr_NoMemory(); return -1; } // 将 ob_items 字段设置为 items self->ob_item = items; // 将 ob_size 字段设置为 newsize Py_SIZE(self) = newsize; // 将 allocated 字段设置为 new_allocated self->allocated = new_allocated; return 0;\n} 我们看到还是很简单的，没有什么黑科技。然后是列表扩容的时候，容量和元素个数之间的规律。其实在 list_resize 函数中是有注释的，其中有这么一行。 说明我们往一个空列表中不断 append 元素的时候，容量会按照上面的规律进行变化，我们来试一下。 lst = []\nallocated = 0\nprint(\"此时容量是: 0\") for item in range(100): lst.append(item) # 添加元素 # 计算 ob_size ob_size = len(lst) # 判断 ob_size 和当前的容量 if ob_size > allocated: # 列表的大小减去空列表的大小，再除以 8 显然就是容量 allocated = (lst.__sizeof__() - [].__sizeof__()) // 8 print(f\"列表扩容啦, 新的容量是: {allocated}\")\n\"\"\"\n此时容量是: 0\n列表扩容啦, 新的容量是: 4\n列表扩容啦, 新的容量是: 8\n列表扩容啦, 新的容量是: 16\n列表扩容啦, 新的容量是: 25\n列表扩容啦, 新的容量是: 35\n列表扩容啦, 新的容量是: 46\n列表扩容啦, 新的容量是: 58\n列表扩容啦, 新的容量是: 72\n列表扩容啦, 新的容量是: 88\n列表扩容啦, 新的容量是: 106\n\"\"\" 我们看到和官方给的结果是一样的，显然这是毫无疑问的，根据底层的公式也能算出来。 ob_size = 0\nallocated = 0 print(allocated, end=\" \")\nfor item in range(100): newsize = ob_size + 1 if newsize > allocated: allocated = (newsize + (newsize >> 3) + 6) & ~3 print(allocated, end=\" \") ob_size = newsize\n\"\"\"\n0 4 8 16 24 32 40 52 64 76 92 108 \"\"\" 注：扩容是在添加元素的时候发现容量不够发生的，也就是底层数组存储的实际元素的个数（列表长度）等于数组长度，没办法再容纳新的元素了，所以要扩容。 如果我们直接通过 lst = [] 这种形式创建列表的话，那么其长度和容量是一样的。 lst = [0] * 1000\n# 长度和容量一致\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 但再添加一个元素的话, 那么 ob_size 会变成 1001，大于容量 1000\n# 所以此时列表就要扩容了, 执行 list_resize，里面的 new_size 就是 1001\n# 然后是怎么分配容量来着，new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6)\nprint( \"新容量:\", 1001 + (1001 >> 3) + (3 if 1001 < 9 else 6)\n) # 新容量: 1132 # append 一个元素，列表扩容\nlst.append(123)\n# 计算容量\nprint((lst.__sizeof__() - [].__sizeof__()) // 8) # 1132 结果是一样的，因为底层就是这么实现的，所以结果必须一样。只不过我们通过这种测试的方式证明了这一点，也加深了对列表的认识。 需要注意的是，会影响列表元素个数的操作（append、extend、insert、pop 等等），在执行前都会先执行一下 list_resize 进行容量检测。如果计算之后的 newsize 和 allocated 之间的关系是匹配的，即 allocated//2 <= newsize <= allocated，那么只需要将 ob_size 的大小更新为 newsize 即可。如果不匹配，那么还要进行扩容，此时是一个 O(n) 的操作。 介绍完扩容，再来介绍缩容，因为列表元素个数要是减少到和容量不匹配的话，也要进行缩容。 举个生活中的例子，假设你租了 10 间屋子用于办公，显然你要付 10 间屋子的房租，不管你有没有用，一旦租了肯定是要付钱的。同理底层数组也是一样，只要你申请了，不管有没有元素，内存已经占用了。但有一天你用不到 10 间屋子了，假设要用 8 间或者 9 间，那么会让剩余的屋子闲下来。但由于退租比较麻烦，并且只闲下来一两间屋子，所以干脆就不退了，还是会付 10 间屋子的钱，这样没准哪天又要用的时候就不用重新租了。 对于列表也是如此，在删除元素（相当于屋子不用了）的时候，如果发现长度还没有低于容量的一半，那么也不会缩容。但反之就要缩容了，比如屋子闲了 8 间，也就是只需要两间屋子就足够了，那么此时肯定要退租了，闲了 8 间，可能会退掉 6 间。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 删除 500 个元素, 此时长度或者说 ob_size 就为 500\nlst[500:] = []\n# 但 ob_size 还是达到了容量的一半, 所以不会缩容\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 500 1000 # 如果再删除一个元素的话, 那么不好意思, 显然就要进行缩容了\n# 因为 ob_size 变成了 499, 小于 1000 // 2\n# 缩容之后容量怎么算呢? 还是之前那个公式\nprint(499 + (499 >> 3) + (3 if 499 < 9 else 6)) # 567 # 测试一下, 删除一个元素, 看看会不会按照我们期待的规则进行缩容\nlst.pop()\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 499 567 一切都和我们想的是一样的，另外在代码中我们还看到一个 if 语句，就是如果 newsize 是 0，那么容量也是 0，来测试一下。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 lst[:] = []\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 0 0 # 如果按照之前的容量变化公式的话, 会发现结果应该是 3\n# 但实际结果是 0, 就是因为多了 if 判断\n# 如果 newsize 是 0, 就把容量也设置为 0\nprint(0 + (0 >> 3) + (3 if 0 < 9 else 6)) # 3 为什么要这么做呢？因为 Python 认为，列表长度为 0 的话，说明你不想用这个列表了，所以多余的 3 个也没有必要申请了。 还以租房为栗，如果你一间屋子都不用了，说明你可能不用这里的屋子办公了，因此直接全部退掉。 以上就是列表在改变容量时所采用的策略，我们从头到尾全部分析了一遍。下一篇文章来看一下列表的创建，以及缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"34. 列表是怎么扩容的？","id":"141","title":"34. 列表是怎么扩容的？"},"142":{"body":"前面我们分析了列表的底层结构和扩容机制，本篇文章来聊一聊列表的创建和销毁，以及缓存池。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 楔子","id":"142","title":"楔子"},"143":{"body":"创建列表，解释器只提供了唯一的一个 Python/C API，也就是 PyList_New。这个函数接收一个 size 参数，允许我们在创建 PyListObject 对象时指定底层的 PyObject * 数组的长度。 //Objects/listobject.c\nPyObject *\nPyList_New(Py_ssize_t size)\n{ // 声明一个 PyListObject * 变量 // 指向即将创建的 PyListObject 对象 PyListObject *op; // 底层数组的长度必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // numfree 表示缓存池中已缓存的元素个数 // 如果大于 0，证明有可用元素，那么会从缓存池中获取 if (numfree) { // 可用元素的数量减一 numfree--; // 获取缓存的列表指针，并将指向的列表的引用计数设置为 1 op = free_list[numfree]; _Py_NewReference((PyObject *)op); } else { // 如果缓存池中没有可用元素，那么通过 PyObject_GC_New 申请内存 // 问题来了，之前申请内存不是用的 PyObject_New 吗 // 这里为啥换成 PyObject_GC_New 呢？我们稍后再说 op = PyObject_GC_New(PyListObject, &PyList_Type); if (op == NULL) return NULL; } // 如果 size <= 0，那么一定等于 0，此时列表不包含任何元素 if (size <= 0) // 那么 ob_item 直接设置为 NULL op->ob_item = NULL; else { // 否则为底层数组申请内存，因为存储的都是指针 // 所以大小为 size * sizeof(PyObject *) op->ob_item = (PyObject **) PyMem_Calloc(size, sizeof(PyObject *)); if (op->ob_item == NULL) { Py_DECREF(op); return PyErr_NoMemory(); } } // 将 ob_size 和 allocated 均设置为 size Py_SIZE(op) = size; op->allocated = size; // 让列表被 GC 跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 整个过程非常好理解，就是先创建一个 PyListObject 对象，然后再为底层数组申请内存，最后通过 ob_item 字段将两者关联起来。当然这个过程中会使用缓存池，关于缓存池一会儿再聊。 然后还要说一下内存申请函数，在这之前我们看到申请内存用的是 PyObject_New 函数，它和这里的 PyObject_GC_New 有什么区别呢？由于涉及到 Python 的内存管理，我们暂时先不聊那么深，大家先有个基本了解即可，等到介绍内存管理和垃圾回收的时候会详细剖析。 我们知道 Python 对象在底层都是一个结构体，并且结构体内部嵌套了 PyObject。但对于那些能够产生循环引用的可变对象来说，它们除了 PyObject 之外，还包含了一个 PyGC_Head，用于垃圾回收。 所以 PyObject_New 和 PyObject_GC_New 接收的参数是一样的，但后者会多申请 16 字节的内存，这 16 字节是为 PyGC_Head 准备的。那么问题来了，PyGC_Head 在什么地方呢？ PyGC_Head 就在 PyObject 的前面，但是注意：虽然为 PyGC_Head 申请了内存，但返回的是 PyObject 的地址。至于这里面的更多细节，后续在剖析内存管理和垃圾回收的时候细说，目前先简单了解一下即可。 然后再说一下计算内存的两种方式： import sys lst = []\n# 可以调用 __sizeof__ 方法计算对象的内存\nprint(lst.__sizeof__()) # 40\n# 也可以通过 sys.getsizeof 函数\nprint(sys.getsizeof(lst)) # 56 我们看到 sys.getsizeof 算出的结果会多出 16 字节，相信你能猜到原因，因为它将 PyGC_Head 也算进去了，而对象的 __sizeof__ 方法则不会算在内。 不过对于字符串、整数、浮点数这种不会产生循环引用的对象来说，由于没有 PyGC_Head，所以两种方式计算的结果是一样的。 import sys print(\"\".__sizeof__()) # 49\nprint(sys.getsizeof(\"\")) # 49 print((123).__sizeof__()) # 28\nprint(sys.getsizeof(123)) # 28 以上就是列表的创建，整个过程不难理解。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的创建","id":"143","title":"列表的创建"},"144":{"body":"创建 PyListObject 对象时，会先检测缓存池 free_list 里面是否有可用的对象，有的话直接拿来用，否则通过 malloc 在系统堆上申请。列表的缓存池是使用数组实现的，里面最多维护 80 个 PyListObject 对象。 // Objects/listobject.c\n#ifndef PyList_MAXFREELIST\n#define PyList_MAXFREELIST 80\n#endif\n// free_list 是一个 PyListObject * 数组，容量为 80\n// 添加元素时会从数组的尾部添加，获取元素时也会从数组的尾部获取\nstatic PyListObject *free_list[PyList_MAXFREELIST];\n// 缓存池中可用元素数量\nstatic int numfree = 0; 根据之前的经验我们知道，既然创建的时候能从缓存池中获取，那么在执行析构函数的时候也要把列表放到缓存池里面。看一下列表的析构函数，它由 PyList_Type 的 tp_dealloc 字段负责，而该字段被设置为 list_dealloc。 // Objects/listobject.c\nstatic void\nlist_dealloc(PyListObject *op)\n{ Py_ssize_t i; // 列表可能会产生循环引用，因此创建之后要被 GC 跟踪 // 而现在要被回收了，所以也要取消 GC 跟踪 PyObject_GC_UnTrack(op); // 这一步的作用，稍后再说 Py_TRASHCAN_BEGIN(op, list_dealloc) // 先释放底层数组 if (op->ob_item != NULL) { // 但是释放之前，还有一件重要的事情 // 要将底层数组中每个指针指向的对象的引用计数都减去 1 // 因为它们不再持有对\"对象\"的引用 i = Py_SIZE(op); while (--i >= 0) { Py_XDECREF(op->ob_item[i]); } // 然后释放底层数组所占的内存 PyMem_FREE(op->ob_item); } // 如果已缓存的元素个数小于 80 个，并且 op 指向的是列表 // 那么将 op 追加到数组中，并将 numfree 自增 1 if (numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) free_list[numfree++] = op; else // 否则将列表的内存释放掉 Py_TYPE(op)->tp_free((PyObject *)op); Py_TRASHCAN_END\n} 我们知道创建一个 PyListObject 对象会分为两步，先创建 PyListObject 对象，然后创建底层数组，最后让 PyListObject 对象的 ob_item 字段指向底层数组的首元素。同理，在销毁一个 PyListObject 对象时，会先释放 ob_item 维护的底层数组，然后在缓存池已满的情况下再释放 PyListObject 对象自身。 现在我们算是明白了缓存池的机制，本来在销毁列表时，要将它的内存释放。但因为缓存池机制，解释器并没有这么做，而是将它的指针放在了缓存池里，至于列表对象则依旧驻留在堆上，只是我们已经无法再访问了。 当以后创建新的 PyListObject 对象时，解释器会首先唤醒这些已经死去的 PyListObject 对象，给它们一个洗心革面、重新做人的机会。但需要注意的是，这里缓存的仅仅是 PyListObject 对象，至于底层数组，其 ob_item 已经不再指向了。 从 list_dealloc 中我们可以看到，PyListObject 对象的指针在放进缓存池之前，ob_item 指向的数组就已经被释放掉了，同时数组中指针指向的对象的引用计数会减 1。所以最终数组中这些指针指向的对象也大难临头各自飞了，或生存、或毁灭，总之此时和 PyListObject 之间已经没有任何联系了。 但是为什么要这么做呢？为什么不连底层数组也一起维护呢？可以想一下，如果继续维护的话，数组中指针指向的对象永远不会被释放，那么很可能会产生悬空指针的问题。 但实际上是可以将底层数组进行保留的，做法是只将数组中指针指向的对象的引用计数减 1，然后将数组中的指针都设置为 NULL，不再指向之前的对象，但并不释放底层数组本身所占用的内存空间。这样一来释放的内存不会交给系统堆，那么再次分配的时候，速度会快很多。但这样会带来两个问题。 1）这些内存没人用也会一直占着，并且只能供 PyListObject 对象的 ob_item 指向的底层数组使用。 2）基于缓存池获取的列表的容量，和新创建的列表的容量不一定匹配。比如底层数组长度为 6 的 PyListObject * 被放入了缓存池，那么表示列表最多容纳 6 个元素，但如果我们要创建一个长度为 8 的列表怎么办？此时依旧要重新为底层数组申请内存。 因此基于以上两个原因，Python 选择将底层数组所占的内存交还给了系统堆，当然也节省了内存。 lst1 = [1, 2, 3]\nprint(id(lst1)) # 139672412671360\n# 扔到缓存池中，放在数组的尾部\ndel lst1 # 从缓存池中获取，也会从数组的尾部开始拿\nlst2 = [1, 2, 3]\nprint(id(lst2)) # 139672412671360 # 因此打印的地址是一样的 以上就是列表的创建和销毁，以及它的缓存池原理。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的销毁","id":"144","title":"列表的销毁"},"145":{"body":"在看列表的销毁过程时，我们注意到里面有这么一行代码。 Py_TRASHCAN_BEGIN(op, list_dealloc) 这是做什么的呢，首先在 Python 中，我们可以创建具有深度递归的对象，比如： L = None for i in range(2 ** 20): L = [L] del L 此时的 L 就是一个嵌套了 2 ** 20 层的列表，当我们删除 L 的时候，会先销毁 L[0]、然后销毁 L[0][0]，以此类推，直到递归深度为 2 ** 20。而这样的深度毫无疑问会溢出 C 的调用栈，导致解释器崩溃。但事实上我们在 del L 的时候解释器并没有崩溃，原因就是 CPython 发明了一种名为 trashcan 的机制，它通过延迟销毁的方式来限制销毁的递归深度。关于这一特性，我们知道就好了，不用太关注。 下一篇文章来聊一聊列表的操作在底层是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » trashcan 机制","id":"145","title":"trashcan 机制"},"146":{"body":"列表拥有非常多的方法，比如添加元素、查询元素等，这些都属于列表的自定义方法。当然不光是列表，任何对象都可以有自己的自定义方法，而这些方法会保存在类型对象的 tp_methods 里面。 当然列表除了拥有自定义的方法之外，还拥有作为序列型对象所共有的方法，比如合并、基于索引和切片获取元素、基于索引和切片设置元素等等。这些方法会基于种类被抽象成三个方法簇，分别是： tp_as_number：数值型对象拥有的方法； tp_as_sequence：序列型对象拥有的方法； tp_as_mapping：映射型对象拥有的方法； 每个方法簇都包含了大量的 C 函数，每个 C 函数一般会对应 Python 里的一个魔法方法和操作符。比如 tp_as_sequence 的 sq_concat 对应序列型对象的 __add__ 方法，tp_as_number 的 nb_subtract 对应数值型对象的 __sub__ 方法。 那么接下来我们就详细剖析一下这些方法的具体实现过程。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 楔子","id":"146","title":"楔子"},"147":{"body":"序列型对象都实现了加法运算，比如列表，两个列表相加可以合并为一个新的列表。 print([1, 2, 3] + [4, 5]) \"\"\"\n[1, 2, 3, 4, 5]\n\"\"\" 虽然使用了 + 操作符，但它在底层是由 tp_as_sequence 的 sq_concat 负责实现的，该字段被赋值为 list_concat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_concat(PyListObject *a, PyObject *bb)\n{ // 两个列表相加之后的新列表的长度 Py_ssize_t size; Py_ssize_t i; PyObject **src, **dest; PyListObject *np; // 如果 bb 不是列表，抛出 TypeError if (!PyList_Check(bb)) { PyErr_Format(PyExc_TypeError, \"can only concatenate list (not \\\"%.200s\\\") to list\", bb->ob_type->tp_name); return NULL; }\n#define b ((PyListObject *)bb) // 两个列表的长度相加一定小于 PY_SSIZE_T_MAX if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) return PyErr_NoMemory(); // 新列表的长度，等于相加的两个列表的长度之和 size = Py_SIZE(a) + Py_SIZE(b); // 为 PyListObject 和底层数组申请空间（空间大小为 8 * size） np = (PyListObject *) list_new_prealloc(size); if (np == NULL) { return NULL; } // 将第一个列表的元素增加引用计数之后，拷贝到新列表中 src = a->ob_item; dest = np->ob_item; for (i = 0; i < Py_SIZE(a); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将第二个列表的元素增加引用计数之后，拷贝到新列表中 src = b->ob_item; dest = np->ob_item + Py_SIZE(a); for (i = 0; i < Py_SIZE(b); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; // 转成泛型指针之后返回 return (PyObject *)np;\n#undef b\n} 逻辑非常简单，假设两个列表 a 和 b 相加，过程如下。 先申请一个新列表，长度为 len(a) + len(b)； 将列表 a 的元素拷贝到新列表中； 将列表 b 的元素拷贝到新列表中； 说白了就是两个 for 循环。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的相加","id":"147","title":"列表的相加"},"148":{"body":"列表可以乘上一个整数，将自身重复指定次数，该过程会返回一个新列表。 print([1, 2, 3] * 3)\n\"\"\"\n[1, 2, 3, 1, 2, 3, 1, 2, 3]\n\"\"\" 虽然使用了 * 操作符，但它在底层是由 tp_as_sequence 的 sq_repeat 负责实现的，该字段被赋值为 list_repeat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_repeat(PyListObject *a, Py_ssize_t n)\n{ Py_ssize_t i, j; Py_ssize_t size; PyListObject *np; PyObject **p, **items; PyObject *elem; // 如果 n 小于 0，那么将 n 设置为 0 if (n < 0) n = 0; // 长度有限制，不能超过 PY_SSIZE_T_MAX if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) return PyErr_NoMemory(); // 新列表的长度 size = Py_SIZE(a) * n; // 如果列表长度为 0，那么直接返回空列表即可 if (size == 0) return PyList_New(0); // 为新列表和底层数组申请空间，底层数组的长度为 size np = (PyListObject *) list_new_prealloc(size); if (np == NULL) return NULL; // 如果原始列表的长度为 1，比如 a = [1]，n = 3 // 那么新列表就是 [1, 1, 1] if (Py_SIZE(a) == 1) { // 指向新列表的底层数组的首元素 items = np->ob_item; // 拿到原始列表的第一个元素 elem = a->ob_item[0]; // 将新列表的底层数组的元素全部设置为 elem for (i = 0; i < n; i++) { items[i] = elem; Py_INCREF(elem); } } // 如果原始列表的长度不为 1 else { // 指向新列表的底层数组的首元素 p = np->ob_item; // 指向原始列表的底层数组的首元素 items = a->ob_item; // 两层 for 循环 // 内层循环遍历原始数组，将元素拷贝到新数组，外层循环则是循环 n 次 for (i = 0; i < n; i++) { for (j = 0; j < Py_SIZE(a); j++) { *p = items[j]; Py_INCREF(*p); p++; } } } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; return (PyObject *) np;\n} 整个过程非常朴实无华。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的重复","id":"148","title":"列表的重复"},"149":{"body":"列表可以基于索引和切片截取元素。 data = [1, 2, 3, 4, 5]\nprint(data[1]) # 2\nprint(data[1: 4]) # [2, 3, 4] 在底层它由 tp_as_mapping 的 mp_subscript 实现，该字段被赋值为 list_subscript 函数，看一下它的内部逻辑。 // Objects/listobject.c static PyObject *\nlist_subscript(PyListObject* self, PyObject* item)\n{ // 在基于索引和切片截取时，所有序列型对象的逻辑都差不多 if (PyIndex_Check(item)) { Py_ssize_t i; // 如果 item 是索引，那么转成 Py_ssize_t 整数 i = PyNumber_AsSsize_t(item, PyExc_IndexError); if (i == -1 && PyErr_Occurred()) return NULL; // 如果 i 小于 0，那么加上列表长度，转成正数索引 if (i < 0) i += PyList_GET_SIZE(self); // 调用 list_item 获取 ob_item 中索引为 i 的元素 return list_item(self, i); } // 如果 item 是切片 else if (PySlice_Check(item)) { // start, stop, step 分别表示起始位置、终止位置、步长 // slicelength 表示切片截取的长度，也就是要截取多少个元素 Py_ssize_t start, stop, step, slicelength, cur, i; PyObject* result; PyObject* it; PyObject **src, **dest; // 获取切片的 start、stop、step if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 传入原始列表的长度，对 start 和 stop 进行调整，并返回 slicelength slicelength = PySlice_AdjustIndices(Py_SIZE(self), &start, &stop, step); // 如果 slicelength <= 0，说明截取不到任何元素 // 比如 data[5: 1] 或者 data[1: 5: -1]，那么直接返回空列表 if (slicelength <= 0) { return PyList_New(0); } // 如果步长为 1，那么直接将列表中 start 到 stop 之间的元素拷过去即可 else if (step == 1) { return list_slice(self, start, stop); } // 否则说明步长不为 1 else { // 为创建的新列表和底层数组申请空间 result = list_new_prealloc(slicelength); if (!result) return NULL; src = self->ob_item; // 从 start 处开始遍历，将元素拷贝过去 // 然后 cur 每次增加 step，遍历次数为 slicelength dest = ((PyListObject *)result)->ob_item; for (cur = start, i = 0; i < slicelength; cur += (size_t)step, i++) { it = src[cur]; Py_INCREF(it); dest[i] = it; } // 将新列表的 ob_size 设置为 slicelength Py_SIZE(result) = slicelength; return result; } } // 否则说明 item 既不是索引也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"list indices must be integers or slices, not %.200s\", item->ob_type->tp_name); return NULL; }\n} 这个和之前介绍的 bytes 对象有点像，因为它们都是序列型对象，在基于索引和切片截取元素时的逻辑也是类似的。但 bytes 对象只能截取元素，却不能设置元素，而列表是可以的，因为列表是可变对象。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片获取元素","id":"149","title":"基于索引和切片获取元素"},"15":{"body":"PyObject 是所有对象的核心，它包含了所有对象都共有的信息，但是还有那么一个属性虽然不是每个对象都有，但至少有一大半的对象会有，能猜到是什么吗？ 之前说过，对象根据所占的内存是否固定，可以分为定长对象和变长对象，而变长对象显然有一个长度的概念，比如字符串、列表、元组等等。即便是相同类型的实例对象，但是长度不同，所占的内存也是不同的。比如字符串内部有多少个字符，元组、列表内部有多少个元素，显然这里的多少也是 Python 中很多对象的共有特征。虽然不像引用计数和类型那样是每个对象都必有的，但也是绝大部分对象所具有的。 所以针对变长对象，Python 底层也提供了一个结构体，因为 Python 里面很多都是变长对象。 // Include/object.h typedef struct { PyObject ob_base; Py_ssize_t ob_size;\n} PyVarObject; 我们看到 PyVarObject 实际上是 PyObject 的一个扩展，它在 PyObject 的基础上添加了一个 ob_size 字段，用于记录内部的元素个数。比如列表，列表的 ob_size 维护的就是列表的元素个数，插入一个元素，ob_size 会加 1，删除一个元素，ob_size 会减 1。 因此使用 len 函数获取列表的元素个数是一个时间复杂度为 O(1) 的操作，因为 ob_size 始终和内部的元素个数保持一致，所以会直接返回 ob_size。 所有的变长对象都拥有 PyVarObject，而所有的对象都拥有 PyObject，这就使得在 Python 中，对对象的引用变得非常统一。我们只需要一个 PyObject * 就可以引用任意一个对象，而不需要管这个对象实际是一个什么样的对象。 所以 Python 变量、以及容器内部的元素，本质上都是一个 PyObject *。而在操作变量的时候，也要先根据 ob_type 字段判断指向的对象的类型，然后再寻找该对象具有的方法，这也是 Python 效率慢的原因之一。 由于 PyObject 和 PyVarObject 要经常使用，所以底层提供了两个宏，方便定义。 // Include/object.h #define PyObject_HEAD PyObject ob_base;\n#define PyObject_VAR_HEAD PyVarObject ob_base; 比如定长对象浮点数，在底层对应的结构体为 PyFloatObject，它只需在 PyObject 的基础上再加一个 double 即可。 typedef struct { // 等价于 PyObject ob_base; PyObject_HEAD double ob_fval;\n} PyFloatObject; 再比如变长对象列表，在底层对应的结构体是 PyListObject，所以它需要在 PyVarObject 的基础上再加一个指向指针数组首元素的二级指针和一个容量。 typedef struct { // 等价于 PyVarObject ob_base; PyObject_VAR_HEAD PyObject **ob_item; Py_ssize_t allocated;\n} PyListObject; 这上面的每一个字段都代表什么，我们之前提到过，当然这些内置的数据结构后续还会单独剖析。 对于 PyListObject，里面的 ob_item 就是指向指针数组首元素的二级指针，而 allocated 表示已经分配的容量，一旦添加元素的时候发现 ob_size 自增 1 之后会大于 allocated，那么解释器就知道数组已经满了（容量不够了）。于是会申请一个长度更大的指针数组，然后将旧数组内部的元素按照顺序逐个拷贝到新数组里面，并让 ob_item 指向新数组的首元素，这个过程就是列表的扩容，后续在剖析列表的时候还会细说。 所以我们看到列表在添加元素的时候，地址是不会改变的，即使容量不够了也没关系，直接让 ob_item 指向新的数组就好了，至于 PyListObject 对象（列表）本身的地址是不会变化的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 可变对象的地基：PyVarObject","id":"15","title":"可变对象的地基：PyVarObject"},"150":{"body":"列表是可变对象，因为它支持设置元素，即对内部元素进行修改。基于索引设置元素就不说了，我们主要看切片，它背后还是有一些复杂的。 data = [1, 2, 3, 4, 5, 6, 7, 8] # 通过切片设置元素，右值一定是一个可迭代对象\ndata[0: 3] = [11, 22, 33]\n# 会将 data[0] 设置为 11，将 data[1] 设置为 22，将 data[2] 设置为 33\nprint(data)\n\"\"\"\n[11, 22, 33, 4, 5, 6, 7, 8]\n\"\"\" # 而且它们的长度是可以不相等的，这里表示将 [0: 3] 的元素设置为 [1, 2]\n# 即 data[0] 设置成 1，data[1] 设置成 2，那么问题来了，data[2] 咋办？\n# 由于右值中已经没有元素与之匹配了，那么 data[2] 就会被删掉\ndata[0: 3] = [1, 2]\nprint(data)\n\"\"\"\n[1, 2, 4, 5, 6, 7, 8]\n\"\"\" # 所以如果想删除 [0: 3] 的元素，那么只需要执行 data[0: 3] = [] 即可\n# 因为 [] 里面没有元素能与之匹配，所以 data 中 [0: 3] 的位置由于匹配不到\n# 那么相当于执行了删除操作，当然由于 Python 的动态特性，还可以像下面这么做\n# data[0: 3] = []、data[0: 3] = ()、data[0: 3] = \"\" 等等也是没问题的\ndata[0: 3] = \"\"\nprint(data)\n\"\"\"\n[5, 6, 7, 8]\n\"\"\"\n# 实际上执行 del data[0] 的时候，就是执行了 data[0: 1] = []\n# 当然，如果右值元素多的话也是可以的，相当于插入\n# 比如这里的 data[0] 匹配 1，然后左边就结束了\n# 于是右侧剩余的元素会依次插在后面\ndata[0: 1] = [1, 2, 3, 4]\nprint(data)\n\"\"\"\n[1, 2, 3, 4, 6, 7, 8]\n\"\"\"\n# 重点来了，如果切片的步长不等于 1 的话，那么两边一定要匹配\n# 由于 data[:: 2] 会得到 4 个元素，那么右边的可迭代对象的长度就必须也是 4\ndata[:: 2] = ['a', 'b', 'c', 'd']\nprint(data)\n\"\"\"\n['a', 2, 'b', 4, 'c', 7, 'd']\n\"\"\" # 但如果长度不一致，那么会报错\ntry: data[:: 2] = ['a', 'b', 'c']\nexcept Exception as e: # 显然会报错 print(e) \"\"\"\nattempt to assign sequence of size 3 to extended slice of size 4\n\"\"\" 至于它的源码有兴趣可以自己看一下，在底层它由 tp_as_mapping 的 mp_ass_subscript 负责实现，该字段被赋值为 list_ass_subscript 函数。逻辑比较长，但不难理解，我们总结一下。 list_subscript 用于获取元素，list_ass_subscript 用于设置元素。调用这两个函数，我们即可以传入索引，也可以传入切片。 获取元素时传入的是索引，那么 list_subscript 内部会调用 list_item，传入的是切片，那么会调用 list_slice。 设置元素时传入的是索引，那么 list_ass_subscript 内部会调用 list_ass_item，传入的是切片，那么会调用 list_ass_slice。并且 list_ass_slice 虽然是设置元素，但删除元素也是调用的它，比如通过 data[n: n+1]=[] 便可删除索引为 n 的元素。事实上 remove 和 pop 方法都只是计算出待删除元素的索引，真正的删除操作还是通过 list_ass_slice 来执行的。 另外，当传入切片时，只有步长为 1，才会调用 list_slice 和 list_ass_slice。如果步长不为 1，那么就采用循环的方式逐个遍历。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片设置元素","id":"150","title":"基于索引和切片设置元素"},"151":{"body":"以上我们就介绍了列表作为序列型对象拥有的方法，但除了这些它还有很多自定义的方法。由于列表用得非常广泛，关于它的方法我们都来详细地说上一说，下一篇文章介绍列表的自定义方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 小结","id":"151","title":"小结"},"152":{"body":"上一篇文章我们介绍了列表作为序列型对象支持的方法，但列表还有很多的自定义方法。作为一名优秀的 Python 工程师，我们必须要知道这些方法的实现过程，以及相应的时间复杂度。 实例对象能够调用的方法都定义在类型对象中，类型对象无一例外都是 PyTypeObject 结构体实例，该结构体有一个 tp_methods 字段，负责维护实例对象能够调用的方法。由于 tp_methods 指向 PyMethodDef 结构体类型的数组，所以一个 PyMethodDef 结构体实例，就是 Python 实例对象能够调用的一个方法。 // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 承载了具体逻辑的 C 函数 PyCFunction ml_meth; // 指示函数的调用方式和传递参数的方式，比如 /* METH_NOARGS: 表示函数不接收任何参数 * METH_O: 函数只接收一个参数 * METH_VARARGS: 函数支持以元组的形式接收多个位置参数 * METH_KEYWORDS: 函数支持关键字参数 * METH_CLASS: 函数是一个类方法，等价于 Python 里的 @classmethod * METH_STATIC: 函数是一个静态方法，即 @staticmethod * METH_FASTCALL: 函数使用优化的快速调用协议，Python 3.7 及以上版本可用 传递参数时使用 C 数组，而不是 Python 元组 * METH_COEXIST: 如果希望存在两个同名函数，但类和实例分别调用不同的函数 那么便可以指定 METH_COEXIST */ int ml_flags; // 函数的 docstring const char *ml_doc; }; 而 list 在底层对应 PyList_Type，它的 tp_methods 字段被赋值为 list_methods。 里面定义了列表可以调用的方法，相信当你以后想查看某个对象的方法的底层实现时，已经知道该怎么定位了，下面我们就来看看这些方法的实现过程。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 楔子","id":"152","title":"楔子"},"153":{"body":"append 方法可以往列表尾部追加元素。 // Objects/clinic/listobject.c.h\n#define LIST_APPEND_METHODDEF \\ {\"append\", (PyCFunction)list_append, METH_O, list_append__doc__}, 它由 list_append 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_append(PyListObject *self, PyObject *object)\n{ // 调用 app1 添加元素，并返回 None if (app1(self, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\napp1(PyListObject *self, PyObject *v)\n{ // 获取当前列表的长度 Py_ssize_t n = PyList_GET_SIZE(self); assert (v != NULL); if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 追加元素之后 ob_size 会变成 n + 1 // 调用 list_resize 函数，判断 n + 1 和容量之间的关系 // 只要涉及到列表元素个数的改变，都要调用 list_resize 函数 if (list_resize(self, n+1) < 0) return -1; // 增加引用计数 Py_INCREF(v); // 将元素设置在索引为 n 的位置 PyList_SET_ITEM(self, n, v); return 0;\n} 所谓往尾部追加元素，本质上就是将元素设置在索引为 len 的位置。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » append：在尾部追加元素","id":"153","title":"append：在尾部追加元素"},"154":{"body":"接下来是列表的 insert 方法。 // Objects/clinic/listobject.c.h\n#define LIST_INSERT_METHODDEF \\ {\"insert\", (PyCFunction)(void(*)(void))list_insert, METH_FASTCALL, list_insert__doc__}, 它由 list_insert 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_insert(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 函数的返回值，但只会返回 None PyObject *return_value = NULL; // 插入的位置 Py_ssize_t index; // 插入的元素 PyObject *object; // insert 方法精确接收两个参数 if (!_PyArg_CheckPositional(\"insert\", nargs, 2, 2)) { goto exit; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 参数 args 是一个元组，里面包含了插入位置和元素 Py_ssize_t ival = -1; // 插入位置，对象必须实现 __index__ PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { // 转成 Py_ssize_t ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } // 赋值给 index index = ival; } // 拿到待插入的元素 object = args[1]; // 调用 list_insert_impl 执行元素插入逻辑 return_value = list_insert_impl(self, index, object); exit: // 虽然这里返回了 return_value，但我们知道 insert 方法是没有返回值的 // 或者说返回值为 None，所以上面的 list_insert_impl 一定返回了 None return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_insert_impl(PyListObject *self, Py_ssize_t index, PyObject *object)\n{ // 调用 ins1 插入元素，插入成功之后返回 None if (ins1(self, index, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\nins1(PyListObject *self, Py_ssize_t where, PyObject *v)\n{ // 初始化循环变量 i，n 为列表长度 Py_ssize_t i, n = Py_SIZE(self); // 指向 ob_item 数组的首元素 PyObject **items; if (v == NULL) { PyErr_BadInternalCall(); return -1; } if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 只要涉及到元素个数的改变，比如添加和删除元素 // 都会先调用 list_resize，在里面检测一下容量 // 比如这里，如果发现 (容量 >= n + 1) && (容量 / 2 <= n + 1) // 那么说明容量目前是合理的，不需要做任何的扩容或缩容操作（如果条件不满足则需要） // 然后将列表的 ob_size 修改为 n + 1，直接返回 if (list_resize(self, n+1) < 0) return -1; // 判断插入位置，如果 where 小于 0，那么加上列表长度 if (where < 0) { where += n; // 加上列表长度之后如果还小于 0，那么让其等于 0 if (where < 0) where = 0; } // 如果插入位置大于列表长度 n，那么让其等于 n，此时相当于 append if (where > n) where = n; items = self->ob_item; // 将 where 以及之后的元素依次向右移动一个位置 for (i = n; --i >= where; ) items[i+1] = items[i]; // 将待插入元素 v 的引用计数加 1，并设置在底层数组中索引为 where 的位置 Py_INCREF(v); items[where] = v; return 0;\n} 以上就是 insert 函数的底层逻辑，列表在插入数据的时候是非常灵活的，不管你在什么位置插入，都是合法的。它会自己调整，在确定待插入位置 where 之后，会将 where 以及之后的所有元素都向后挪动一个位置，空出来的地方设置为待插入的值。 另外我们看到 append 和 insert 其实非常像，都是基于索引设置元素。只不过对于 append 来说，索引就是列表长度，而对于 insert 来说，索引是由外界指定的，但函数内部会进行边界调整。 并且由于 insert 会涉及元素的移动，所以它的时间复杂度是 O(n)，而 append 则不会，它的时间复杂度是 O(1)。当然在极端情况下（发生扩容），append 也会退化成 O(n)，只不过这个过程不会频繁发生，所以 append 的复杂度仍然是 O(1) 的。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » insert：在任意位置插入元素","id":"154","title":"insert：在任意位置插入元素"},"155":{"body":"pop 默认会从尾部弹出一个元素，当然我们也可以指定索引，弹出指定索引对应的元素。如果不指定索引，那么默认是 -1。 // Objects/clinic/listobject.c.h\n#define LIST_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))list_pop, METH_FASTCALL, list_pop__doc__}, 它由 list_pop 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_pop(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 返回值 PyObject *return_value = NULL; Py_ssize_t index = -1; // pop 接收 0 ~ 1 个参数 if (!_PyArg_CheckPositional(\"pop\", nargs, 0, 1)) { goto exit; } // 如果参数个数小于 1，说白了就是没有传参，直接跳转到 skip_optional 标签 if (nargs < 1) { goto skip_optional; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 如果传参了，那么拿到指定的索引 Py_ssize_t ival = -1; PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } index = ival; }\nskip_optional: // 将列表和 index 作为参数传进去，如果不指定索引，那么 index 默认为 -1 return_value = list_pop_impl(self, index); exit: // 返回弹出的元素 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_pop_impl(PyListObject *self, Py_ssize_t index)\n{ PyObject *v; int status; // 如果列表为空，那么抛出 IndexError: pop from empty list if (Py_SIZE(self) == 0) { PyErr_SetString(PyExc_IndexError, \"pop from empty list\"); return NULL; } // 如果 index 小于 0，那么加上列表长度 if (index < 0) index += Py_SIZE(self); // 检测索引是否合法，如果索引小于 0 或大于等于列表长度 // 那么抛出 IndexError: pop index out of range if (!valid_index(index, Py_SIZE(self))) { PyErr_SetString(PyExc_IndexError, \"pop index out of range\"); return NULL; } // 拿到索引为 index 的元素，这也是一会儿要返回的元素 v = self->ob_item[index]; // 快分支，如果 index == Py_SIZE(self) - 1，证明弹出的是列表的最后一个元素 // 那么说明不涉及元素的移动，直接更新 ob_size 即可 if (index == Py_SIZE(self) - 1) { status = list_resize(self, Py_SIZE(self) - 1); if (status >= 0) return v; else return NULL; } Py_INCREF(v); // 删除的不是最后一个元素，那么需要调用 list_ass_slice 进行删除 // 等价于 self[index: index + 1] = []，即删除索引为 index 的元素 status = list_ass_slice(self, index, index+1, (PyObject *)NULL); if (status < 0) { Py_DECREF(v); return NULL; } return v;\n} 以上就是 pop 方法。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » pop：从尾部弹出一个元素","id":"155","title":"pop：从尾部弹出一个元素"},"156":{"body":"index 方法可以接收一个元素，然后返回该元素首次出现的位置。当然还可以额外指定一个 start 和 end，表示查询的范围。 // Objects/clinic/listobject.c.h\n#define LIST_INDEX_METHODDEF \\ {\"index\", (PyCFunction)(void(*)(void))list_index, METH_FASTCALL, list_index__doc__}, 它由 list_index 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_index(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; PyObject *value; Py_ssize_t start = 0; Py_ssize_t stop = PY_SSIZE_T_MAX; // index 方法接收 1 ~ 3 个参数 if (!_PyArg_CheckPositional(\"index\", nargs, 1, 3)) { goto exit; } // args[0] 表示查找的元素 value = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示查找的起始位置 if (!_PyEval_SliceIndexNotNone(args[1], &start)) { goto exit; } if (nargs < 3) { goto skip_optional; } // args[2] 表示查找的结束位置 if (!_PyEval_SliceIndexNotNone(args[2], &stop)) { goto exit; }\nskip_optional: // 调用 list_index_impl 查找元素 return_value = list_index_impl(self, value, start, stop); exit: // 返回 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_index_impl(PyListObject *self, PyObject *value, Py_ssize_t start, Py_ssize_t stop)\n{ Py_ssize_t i; // 如果 start 小于 0，那么加上列表长度 if (start < 0) { start += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (start < 0) start = 0; } // 如果结束位置小于 0，那么加上列表长度，所以它们都支持负数索引 if (stop < 0) { stop += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (stop < 0) stop = 0; } // 从 start 开始遍历 for (i = start; i < stop && i < Py_SIZE(self); i++) { // 获取对应元素 PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 然后进行比较，这个函数我们之前说过 // 它会先比较地址是否相同，如果地址相同，那么直接判定为相等 // 如果地址不同，那么比较值是否相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 相等返回 1，不相等返回 0，比较失败返回 -1 // 如果 cmp 大于 0，表示两者相等，返回索引 if (cmp > 0) return PyLong_FromSsize_t(i); else if (cmp < 0) return NULL; } // 到这里说明元素不存在，那么抛出 ValueError: x is not in list PyErr_Format(PyExc_ValueError, \"%R is not in list\", value); return NULL;\n} 所以列表 index 方法的时间复杂度为 O(n)，因为它在底层要循环整个列表，如果运气好，可能第一个元素就是；运气不好，就只能循环整个列表了。 然后需要注意的是，在比较的时候，会先判断地址是否相同，然后再比较值是否相等。 class A: def __eq__(self, other): return False a = A()\ndata = [a] print(a == data[0]) # False\nprint(data.index(a)) # 0 a 和 data[0] 指向的对象不相等，但 data.index(a) 却返回了相应的索引，因为两者保存的地址是相同的。 同理 if v in data 这种也是类似的，先比较地址，地址不同再比较维护的值。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » index：查询元素首次出现的位置","id":"156","title":"index：查询元素首次出现的位置"},"157":{"body":"列表有一个 count 方法，可以计算出某个元素出现的次数。 // Objects/clinic/listobject.c.h\n#define LIST_COUNT_METHODDEF \\ {\"count\", (PyCFunction)list_count, METH_O, list_count__doc__}, 它由 list_count 函数负责实现。 // Objects/listobject.c\nstatic PyObject *\nlist_count(PyListObject *self, PyObject *value)\n{ Py_ssize_t count = 0; Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { // 如果地址相同，直接判定为相等，count 自增 1 PyObject *obj = self->ob_item[i]; if (obj == value) { count++; continue; } Py_INCREF(obj); // 地址不同（a is b 不成立），则比较维护的值是否相等（看 a == b 是否成立） int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); if (cmp > 0) count++; else if (cmp < 0) return NULL; } // 返回元素出现的次数 return PyLong_FromSsize_t(count);\n} 毫无疑问，count 方法无论在什么情况下，它都是一个时间复杂度为 O(n) 的操作，因为列表必须要从头遍历到尾。 但还是要注意里面判断相等的方式，因为变量只是一个指针，所以 C 的 == 相当于 Python 的 is，但 Python 的 == 则对应 PyObject_RichCompare 函数。而源码里面在比较的时候先执行 ==，所以会先判断两者是不是指向同一个对象。 class A: def __eq__(self, other): return False a = A()\ndata = [a, a, a]\nprint(data[0] == a) # False\nprint(data[1] == a) # False\nprint(data[2] == a) # False print(data.count(a)) # 3 我们看到列表里的三个元素和 a 都不相等，但计算数量的时候，结果是 3。原因就是比较的时候是先比较地址，如果地址一样，那么认为元素相同。 当然 PyObject_RichCompareBool 函数里面已经包含了比较地址的逻辑，该函数会先比较地址是否一样，如果一样则认为相等，不一样再比较对象维护的值是否相等。但在 count 方法里面，将比较地址的逻辑又单独拿了出来，可以理解为快分支。当然即遍没有也无所谓，因为在函数 PyObject_RichCompareBool 里面还是会先对地址进行比较。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » count：查询元素出现的次数","id":"157","title":"count：查询元素出现的次数"},"158":{"body":"除了根据索引删除元素之外，也可以根据值来删除元素，会删除第一个出现的元素。 // Objects/clinic/listobject.c.h\n#define LIST_REMOVE_METHODDEF \\ {\"remove\", (PyCFunction)list_remove, METH_O, list_remove__doc__}, 它由 list_remove 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_remove(PyListObject *self, PyObject *value)\n{ Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 比较是否相等，如果地址相同，那么认为相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 如果相等，那么进行删除 if (cmp > 0) { // 可以看到在删除元素的时候，调用了 list_ass_slice // 等价于 self[i: i + 1] = [] if (list_ass_slice(self, i, i+1, (PyObject *)NULL) == 0) Py_RETURN_NONE; return NULL; } else if (cmp < 0) return NULL; } // 否则说明元素不在列表中，抛出 ValueError: list.remove(x): x not in list PyErr_SetString(PyExc_ValueError, \"list.remove(x): x not in list\"); return NULL;\n} 以上就是 remove 函数的底层实现，说白了就是一层 for 循环，依次比较列表的每个元素和待删除元素是否相等。如果出现了相等的元素，则删除，然后直接返回，因为只删除一个；但如果整个循环遍历结束也没有发现满足条件的元素，那么报错，待删除元素不存在。 所以背后的逻辑并没有我们想象中的那么神秘。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » remove：删除指定元素","id":"158","title":"remove：删除指定元素"},"159":{"body":"如果是你的话，你会怎么对列表进行翻转呢？显然是采用双指针，头指针指向列表的第一个元素，尾指针指向列表的最后一个元素，然后两两交换。交换完毕之后，头指针后移一位、尾指针前移一位，继续交换。当两个指针相遇时，停止交换，而 Python 底层也是这么做的。 // Objects/clinic/listobject.c.h\n#define LIST_REVERSE_METHODDEF \\ {\"reverse\", (PyCFunction)list_reverse, METH_NOARGS, list_reverse__doc__}, 它由 list_reverse 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_reverse(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_reverse_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_reverse_impl(PyListObject *self)\n{ // 如果列表长度不大于 1，那么什么也不做，直接返回 None 即可 if (Py_SIZE(self) > 1) // 大于 1 的话，执行 reverse_slice，传递了两个参数 // 第一个参数是底层数组首元素的地址 // 而第二个参数则是底层数组中索引为 ob_size 的元素的地址 // 但很明显能访问的最大索引应该是 ob_size - 1 才对啊 // 别急，我们继续往下看，看一下 reverse_slice 函数的实现 reverse_slice(self->ob_item, self->ob_item + Py_SIZE(self)); Py_RETURN_NONE;\n} static void\nreverse_slice(PyObject **lo, PyObject **hi)\n{ assert(lo && hi); // 我们看到又执行了一次 --hi // 让二级指针 hi 指向了索引为 ob_size - 1 的元素 --hi; // 数组元素的地址，从左往右是依次增大的 // 如果 lo < hi，证明 lo 依旧在 hi 的左边，那么交换指向的元素 // 如果 lo > hi，证明两者相遇了，交换结束 while (lo < hi) { // 交换指向的元素，下面三步等价于 *lo, *hi = *hi, *lo // 但 C 不支持这么写，它需要借助一个中间变量 PyObject *t = *lo; *lo = *hi; *hi = t; // 两个指针继续靠近，指向的元素继续交换，直到两个指针相遇 ++lo; --hi; }\n} 所以到现在，你还认为 Python 的列表神秘吗？虽然我们很难自己写出一个 Python 解释器，但是底层的一些思想其实并没有那么难，作为一名程序猿很容易想的到。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » reverse：翻转列表","id":"159","title":"reverse：翻转列表"},"16":{"body":"PyObject 是 Python 对象的核心，因为 Python 对象在 C 的层面就是一个结构体，并且所有的结构体都嵌套了 PyObject 结构体。而 PyObject 内部有引用计数和类型这两个字段，因此我们可以肯定的说 Python 的任何一个对象都有引用计数和类型这两个属性。 另外大部分对象都有长度的概念，所以又引入了 PyVarObject，它在 PyObject 的基础上添加了一个 ob_size 字段，用于描述对象的长度。比如字符串内部的 ob_size 维护的是字符串的字符个数，元组、列表、集合等等，其内部的 ob_size 维护的是存储的元素个数，所以使用 len 函数获取对象长度是一个 O(1) 的操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 小结","id":"16","title":"小结"},"160":{"body":"将列表中的元素全部清空，让列表回到初始状态。 // Objects/clinic/listobject.c.h\n#define LIST_CLEAR_METHODDEF \\ {\"clear\", (PyCFunction)list_clear, METH_NOARGS, list_clear__doc__}, 它由 list_clear 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_clear(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_clear_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_clear_impl(PyListObject *self)\n{ _list_clear(self); Py_RETURN_NONE;\n} static int\n_list_clear(PyListObject *a)\n{ Py_ssize_t i; PyObject **item = a->ob_item; if (item != NULL) { // 获取列表的长度 i = Py_SIZE(a); // 将 ob_size 设置为 0 Py_SIZE(a) = 0; // ob_item 设置为 NULL a->ob_item = NULL; // 将容量设置为 0 a->allocated = 0; // 将列表中每个元素指向的对象的引用计数减 1 while (--i >= 0) { Py_XDECREF(item[i]); } // 释放底层数组所占的内存 PyMem_FREE(item); } return 0;\n} 过程非常简单，当列表为空时，除了将 ob_size 和 allocated 设置为 0 之外，还会将底层数组释放掉，减少内存占用。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » clear：清空列表","id":"160","title":"clear：清空列表"},"161":{"body":"调用列表的 copy 方法，可以将列表拷贝一份。 // Objects/clinic/listobject.c.h\n#define LIST_COPY_METHODDEF \\ {\"copy\", (PyCFunction)list_copy, METH_NOARGS, list_copy__doc__}, 它由 list_copy 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_copy(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_copy_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_copy_impl(PyListObject *self)\n{ // 调用 list_slice，也就是基于切片获取元素 // 所以 data.copy() 等价于 data[:] return list_slice(self, 0, Py_SIZE(self));\n} static PyObject *\nlist_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)\n{ // 指向创建的新列表 PyListObject *np; // 指向列表的底层数组的首元素 PyObject **src, **dest; Py_ssize_t i, len; // 创建的新列表的长度 len = ihigh - ilow; // 创建底层数组长度为 len 的列表 np = (PyListObject *) list_new_prealloc(len); if (np == NULL) return NULL; src = a->ob_item + ilow; dest = np->ob_item; // 将原始列表中的元素依次拷贝到新列表中 for (i = 0; i < len; i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 len Py_SIZE(np) = len; // 转成泛型指针之后返回 return (PyObject *)np;\n} 过程非常简单，但列表的 copy 方法或者说 data[:] 这种叫做列表的浅拷贝。关于列表的深浅拷贝也是初学者容易犯的错误之一，我们看一个 Python 的例子。 data = [[]] # 默认是浅拷贝，这个过程会创建一个新列表\n# 但我们说列表里面的元素都是指针，因此只会将里面的指针拷贝一份\n# 而指针指向的内存并没有拷贝\ndata_cp = data.copy() # 两个对象的地址是一样的\nprint(id(data[0]), id(data[0])) \"\"\"\n1338344668224 1338344668224\n\"\"\" # 操作 data[0], 会改变 data_cp[0]\ndata[0].append(123)\nprint(data, data_cp)\n\"\"\"\n[[123]] [[123]]\n\"\"\" # 操作 data_cp[0]，会改变 data[0]\ndata_cp[0].append(456)\nprint(data, data_cp)\n\"\"\"\n[[123, 456]] [[123, 456]]\n\"\"\" 之所以会有这样的现象，是因为 Python 的变量、容器里面的元素都是泛型指针 PyObject *，在传递的时候会传递指针， 但是在操作的时候会操作指针指向的内存。所以 data.copy() 就是创建了一个新列表，然后把元素拷贝了过去，只不过元素都是指针。因为只是拷贝指针，没有拷贝指针指向的对象（内存），因此它们指向的是同一个对象。 但如果我们就想在拷贝指针的同时也拷贝指针指向的对象呢？答案是使用一个叫 copy 的模块。 import copy data = [[]]\n# 此时拷贝的时候，会把指针指向的对象也给拷贝一份\ndata_cp1 = copy.deepcopy(data)\ndata_cp2 = data[:] data[0].append(123)\nprint(data_cp1) # [[]]\nprint(data_cp2) # [[123]] # data[:] 这种方式也是浅拷贝，所以修改 data[0]，会影响 data_cp2[0]\n# 但是没有影响 data_cp1[0]，证明它们是相互独立的，因为指向的是不同的对象 浅拷贝示意图如下： 里面的两个指针数组存储的元素是一样的，都是同一个对象的地址。 深拷贝示意图如下： 里面的两个指针数组存储的元素是不一样的，因为是不同对象的地址。 注意：copy.deepcopy 虽然在拷贝指针的同时会将指针指向的对象也拷贝一份，但这仅仅是针对可变对象，而不可变对象是不会拷贝的。 import copy data = [[], \"古明地觉\"]\ndata_cp = copy.deepcopy(data) print(data[0] is data_cp[0]) # False\nprint(data[1] is data_cp[1]) # True 为什么会这样，其实原因很简单。因为不可变对象是不支持本地修改的，你若想修改只能创建新的对象并指向它。但这对其它的变量而言则没有影响，其它变量该指向谁就还指向谁。 因为 b = a 只是将 a 存储的对象的指针拷贝一份给 b，然后 a 和 b 都指向了同一个对象，至于 a 和 b 本身则是没有任何关系的。如果此时 a 指向了新的对象，是完全不会影响 b 的，b 还是指向原来的对象。 因此，如果一个指针指向的对象不支持本地修改，那么深拷贝不会拷贝对象本身，因为指向的是不可变对象，所以不会有修改一个影响另一个的情况出现。 关于列表还有一些陷阱： data = [[]] * 5\ndata[0].append(1)\nprint(data) # [[1], [1], [1], [1], [1]]\n# 列表乘上一个 n，等于把列表里面的元素重复 n 次\n# 但列表里面存储的是指针，也就是将指针重复 n 次\n# 所以上面的列表里面的 5 个指针存储的地址是相同的\n# 也就是说，它们都指向了同一个列表 # 这种方式创建的话，里面的指针都指向了不同的列表\ndata = [[], [], [], [], []]\ndata[0].append(1)\nprint(data) # [[1], [], [], [], []] # 再比如字典，在后续系列中会说\nd = dict.fromkeys([1, 2, 3, 4], [])\nprint(d) # {1: [], 2: [], 3: [], 4: []}\nd[1].append(123)\nprint(d) # {1: [123], 2: [123], 3: [123], 4: [123]}\n# 它们都指向了同一个列表 类似的陷阱还有很多，因此在工作中要注意，否则一不小心就会出现大问题。 总之记住三句话： 虽然 Python 一切皆对象，但我们拿到的其实是指向对象的指针； 变量在传递的时候本质上是将对象的指针拷贝一份，所以 Python 是变量的赋值传递、对象的引用传递； 操作变量（指针）的时候，会自动操作变量（指针）指向的内存。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » copy：列表的拷贝","id":"161","title":"copy：列表的拷贝"},"162":{"body":"到此关于列表的内容就介绍完了，作为 Python 中的万能容器，我们可以自由地添加、修改和删除元素。但在使用的时候要了解它的底层结构以及元素是如何存储的，应该在什么场景下使用列表，它的每个方法的时间复杂度是多少。 下一篇文章来介绍元组，或许你觉得自己在代码中很少创建元组，但其实它无处不在。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 小结","id":"162","title":"小结"},"163":{"body":"本篇文章来聊一聊元组，元组可以简单理解为不支持元素添加、修改、删除等操作的列表，也就是在列表的基础上移除了增删改操作。 所以从功能上来讲，元组只是列表的子集，那元组存在的意义是什么呢？首先元组可以作为字典的 key 以及集合的元素，因为字典和集合使用的数据结构是哈希表，它存储的元素一定是可哈希的，关于字典和集合我们后续章节会说。 而列表可以动态改变，所以列表不支持哈希。因此当我们希望字典的 key 是一个序列时，显然元组再适合不过了。比如要根据年龄和身高统计人数，那么就可以将年龄和身高组成元组作为字典的 key，人数作为字典的 value。所以元组可哈希，能够作为哈希表的 key，是元组存在的意义之一。当然元组还有其它作用，我们稍后再说。 元组如果可哈希，那么元组存储的元素必须都是可哈希的。只要有一个元素不可哈希，那么元组就会不可哈希。比如元组里面存储了一个列表，由于列表不可哈希，导致存储了列表的元组也会变得不可哈希。","breadcrumbs":"38. 解密元组的实现原理 » 楔子","id":"163","title":"楔子"},"164":{"body":"根据我们使用元组的经验，可以得出元组是一个变长对象，但同时又是一个不可变对象。 // Include/cpython/tupleobject.h\ntypedef struct { PyObject_VAR_HEAD PyObject *ob_item[1];\n} PyTupleObject; 以上是元组在底层对应的结构体，包含引用计数、类型、ob_size、指针数组。然后数组声明的长度虽然是 1，但我们可以当成 n 来用。然后我们再通过结构体的定义，来对比一下它和列表的区别。 元组没有 allocated、也就是容量的概念，这是因为它是不可变的，不支持 resize 操作。 元组对应的指针数组是定义在结构体里面的，可以直接对数组进行操作。而列表对应的指针数组是定义在结构体外面的，两者通过二级指针进行关联，也就是通过二级指针来间接操作指针数组。 至于为什么要这么定义，我们在最开始介绍对象模型的时候也说得很详细了。可变对象的具体元素不会保存在结构体内部，而是会维护一个指针，指针指向的内存区域负责存储元素。当发生扩容时，只需改变指针指向即可，从而方便内存管理。 基于结构体的定义，我们也能分析出元组所占的内存大小，显然它等于 24 + 8 * 元组长度。 >>> ().__sizeof__()\n24\n>>> (1,).__sizeof__()\n32\n>>> (1, 2).__sizeof__()\n40 结果没有问题。","breadcrumbs":"38. 解密元组的实现原理 » 元组的底层结构","id":"164","title":"元组的底层结构"},"165":{"body":"元组支持的操作我们就不看了，因为它只支持查询操作，并且和列表是高度相似的。这里我们直接来看元组的创建过程。正如列表一样，解释器为创建 PyTupleObject 也提供了类似的初始化方法，即 PyTuple_New。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // 参数 size 表示元组的长度 // op 指向创建的元组 PyTupleObject *op; // 循环变量 Py_ssize_t i; // size 必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // PyTuple_MAXSAVESIZE 是一个宏，显然和缓存池相关 // 关于缓存池我们一会儿再说\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { free_list[size] = (PyTupleObject *) op->ob_item[0]; numfree[size]--; _Py_NewReference((PyObject *)op); } else\n#endif // 当不使用缓存池时，要在系统堆上申请内存 { // size * sizeof(PyObject *) + sizeof(PyTupleObject) 便是元组大小 // 该值不能超过 PY_SSIZE_T_MAX，否则报错 if ((size_t)size > ((size_t)PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)) / sizeof(PyObject *)) { return PyErr_NoMemory(); } // 为 PyTupleObject 和长度为 size 的指针数组申请内存 // 然后将它的类型设置为 &PyTuple_Type，将 ob_size 设置为 size op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size); if (op == NULL) return NULL; } // 将指针数组中所有元素设置为 NULL for (i=0; i < size; i++) op->ob_item[i] = NULL;\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); /* extra INCREF so that this is never freed */ }\n#endif // 让 GC 进行跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 相信这种代码逻辑现在对你来说已经没有任何难度了，另外源码中还有几个宏，不过不重要，因此这里直接去掉了。 以上就是元组创建的过程，但里面隐藏了很多的细节没有说，下面我们来介绍元组的缓存池，然后将细节一一揭开。","breadcrumbs":"38. 解密元组的实现原理 » 元组是怎么创建的？","id":"165","title":"元组是怎么创建的？"},"166":{"body":"元组的缓存池也是通过数组来实现的。 // Objects/tupleobject.c #define PyTuple_MAXSAVESIZE 20\n#define PyTuple_MAXFREELIST 2000 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];\nstatic int numfree[PyTuple_MAXSAVESIZE]; 里面出现了两个宏： PyTuple_MAXSAVESIZE：缓存池的大小，默认为 20； PyTuple_MAXFREELIST：缓存池的每个元素都对应一条链表，该宏表示每条链表最多容纳多少个节点（稍后解释）； 从定义中可以看到，元组的缓存池大小是 20，而我们之前介绍的列表的缓存池大小是 80。但这里的 20 和 80 还稍微有些不同，80 指的是列表缓存池的大小，除此之外没有别的含义。而 20 除了表示元组缓存池的大小之外，它还表示只有当元组的长度小于 20，回收时才会被放入缓存池。 当元组的长度为 n 时（其中 n < 20)，那么在回收的时候该元组就会放在缓存池中索引为 n 的位置。假设回收的元组长度为 6，那么就会放在缓存池索引为 6 的位置。 但是问题来了，如果要回收两个长度为 6 的元组该怎么办？很简单，像链表一样串起来就好了。所以 free_list 里面虽然存储的是 PyTupleObject *，但每个 (PyTupleObject *)->ob_item[0]都存储了下一个 PyTupleObject *。 因此你可以认为 free_list 存储了 20 条链表的头结点的指针，每条链表上面挂着具有相同 ob_size 的 PyTupleObject。比如 free_list[n] 便指向了长度为 n 的 PyTupleObject 组成的链表的头结点，至于每条链表的节点个数由 numfree 维护，并且最大不能超过 PyTuple_MAXFREELIST，默认是 2000。 这里再来重新捋一下，元组的缓存池是一个数组，并且索引为 n 的位置回收的是元素个数（ob_size）为 n 的元组，并且 n 不超过 20。但这样的话，具有相同长度的元组不就只能缓存一个了吗？比如我们有很多个长度为 2 的元组都要缓存怎么办呢？显然将它们以链表的形式串起来即可，正如图中显示的那样。至于长度为 n 的元组究竟缓存了多少个，则由 numfree[n] 负责维护。假设 free_list[2] 这条链表上挂了 1000 个 PyTupleObject，那么 numfree[2] 就等于 1000，即长度为 2 的元组被缓存了 1000 个。 当再回收一个长度为 2 的元组时，那么会让该元组的 ob_item[0] 等于 free_list[2]，然后 free_list[2] 等于该元组、numfree[2]++。所以这里的每一条链表和浮点数缓存池是类似的，也是采用的头插法。 我们看一下放入缓存池的具体过程，显然这一步发生在元组销毁的时候。 // Objects/tupleobject.c\nstatic void\ntupledealloc(PyTupleObject *op)\n{ // 循环变量 Py_ssize_t i; // 回收的元组的长度 Py_ssize_t len = Py_SIZE(op); // 让 GC 不再跟踪 PyObject_GC_UnTrack(op); // 延迟释放，和列表是类似的 Py_TRASHCAN_BEGIN(op, tupledealloc) if (len > 0) { i = len; // 减少内部元素指向对象的引用计数，因为元组不再持有对它们的引用 while (--i >= 0) Py_XDECREF(op->ob_item[i]);\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度必须小于 20，即元组长度不超过 20 // 并且 numfree[index] 必须小于 2000，即每条链表最多缓存 2000 个元组 if (len < PyTuple_MAXSAVESIZE && numfree[len] < PyTuple_MAXFREELIST && Py_TYPE(op) == &PyTuple_Type) { // ob_item[0] 充当了链表的 next 指针 // 这里让 op->ob_item[0] 等于 free_list[index] // 然后让 free_list[index] 等于 op // 这样元组就缓存起来了，并成为链表新的头结点，即 free_list[index] op->ob_item[0] = (PyObject *) free_list[len]; // 然后维护一下链表的节点个数 numfree[len]++; free_list[len] = op; goto done; /* return */ }\n#endif } // 如果元组长度大于等于 20，或者缓存池已满，那么释放内存 Py_TYPE(op)->tp_free((PyObject *)op);\ndone: Py_TRASHCAN_END\n} tupledealloc 函数在销毁元组时，会尝试放入缓存池中。那么同理，在创建元组时，也会尝试从缓存池中获取。我们再回过头看一下 PyTuple_New 这个函数，重新解释一下里面的细节。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // ...\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度为 0 时比较特殊，一会单独说 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } // 当 0 < size < 20 时，直接通过 op = free_list[size] 从缓存池获取 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { // 元组取走后，别忘记让 free_list[size] 指向下一个元素 // 也就是 (PyTupleObject *) op->ob_item[0] free_list[size] = (PyTupleObject *) op->ob_item[0]; // 维护对应的链表长度 numfree[size]--; // 引用计数初始化为 1 _Py_NewReference((PyObject *)op); } else\n#endif // ...\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); }\n#endif _PyObject_GC_TRACK(op); return (PyObject *) op;\n} 到此，相信你已经明白元组的缓存池到底是怎么一回事了，说白了就是有 20 条链表，索引为 n 的链表存放长度为 n 的元组，因此可回收的元组的最大长度是 19。然后每条链表的长度小于 2000，也就是具有相同长度的元组最多回收 2000 个。至于链表的 next 指针，则由元组的 ob_item[0] 来充当，通过 ob_item[0] 来获取下一个元素。 >>> tpl = (1, 2, 3)\n>>> print(id(tpl))\n2279295395264\n>>>\n>>> del tpl # 放入缓存池\n>>>\n>>> tpl = (\"古明地觉\", \"古明地恋\", \"芙兰朵露\")\n>>> print(id(tpl))\n2279295395264 可以看到打印的地址是一样的，因为第一次创建的元组被重复利用了。 另外我们说缓存池的长度为 20，会缓存长度为 0 ~ 19 的元组，每种规格的元组最多缓存 2000 个。其实这个说法不太严谨，应该说长度为 1 ~ 19 的元组会缓存 2000 个。如果元组长度为 0，那么它对应的链表只会容纳一个元素，这也说明了不管我们创建多少个空元组，最终在内存中只会存在一个。 tpl1 = ()\ntpl2 = ()\ntpl3 = () print(id(tpl1) == id(tpl2) == id(tpl3)) # True 再来看看 PyTuple_New 这个函数： 从缓存池中获取之后只是增加了引用计数，因为长度为 0 的元组只会缓存一个。所以空元组可以认为是单例的，只有一份。 那么问题来了，为什么元组缓存池可以缓存的元组个数会这么多，每个链表缓存 2000 个，有 20 条链表，总共可以缓存将近 40000 个。这么做的原因就是，元组的使用频率远比我们想象的广泛，主要是它大量使用在我们看不到的地方。比如多元赋值： a, b, c, d = 1, 2, 3, 4 在编译时，上面的 1, 2, 3, 4 实际上是作为元组被加载的，整个赋值相当于元组的解包。再比如函数、方法的返回值，如果是多返回值，本质上也是包装成一个元组之后再返回。 所以元组缓存池能缓存的对象个数，要远大于其它对象的缓存池。可以想象一个大型项目，里面的函数、方法不计其数，只要是多返回值，就会涉及到元组的创建，因此每种长度的元组缓存 2000 个是很合理的。当然如果长度达到了 20，就不会缓存了，这种元组的使用频率没有那么高。 然后再回顾一下元组的回收过程，会发现它和列表有一个很大的不同。列表在被回收时，它的指针数组会被释放；但元组不同，它在被回收时，底层的指针数组会保留，并且还巧妙地通过索引来记录了回收的元组的大小规格。元组的这项技术也被称为静态资源缓存，因为元组在执行析构函数时，不仅对象本身没有被回收，连底层的指针数组也被缓存起来了。那么当再次分配时，速度就会快一些。 from timeit import timeit t1 = timeit(stmt=\"x1 = [1, 2, 3, 4, 5]\", number=1000000)\nt2 = timeit(stmt=\"x2 = (1, 2, 3, 4, 5)\", number=1000000) print(round(t1, 2)) # 0.05\nprint(round(t2, 2)) # 0.01 可以看到耗时，元组只是列表的五分之一。这便是元组的另一个优势，可以将资源缓存起来。而缓存的原因还是如上面所说，因为涉及大量的创建和销毁，所以这一切都是为了加快内存分配。 由于对象都在堆区，为了效率，Python 不得不大量使用缓存的技术。","breadcrumbs":"38. 解密元组的实现原理 » 元组的缓存池","id":"166","title":"元组的缓存池"},"167":{"body":"以上就是元组相关的内容，因为有了列表相关的经验，再来看元组就会快很多。当然啦，元组的一些操作我们没有说，因为和对应的列表操作是类似的。 最后再补充一下，列表是有 __init__ 方法的，而元组没有。 元组的 __init__ 直接继承 object.__init__。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"38. 解密元组的实现原理 » 小结","id":"167","title":"小结"},"168":{"body":"Python 的字典是一种映射型容器对象，保存了键（key）到值（value）的映射关系。通过字典，我们可以实现快速查找，JSON 这种数据结构也是借鉴了 Python 的字典。另外字典是经过高度优化的，因为 Python 底层也在大量地使用字典。 在 Python 里面我们要如何创建一个字典呢？ # 创建一个字典\nd = {\"a\": 1, \"b\": 2}\nprint(d) # {'a': 1, 'b': 2} # 或者我们还可以调用 dict，传入关键字参数即可\nd = dict(a=1, b=2, c=3, d=4)\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然 dict 里面还可以接收位置参数，但是最多接收一个\nd1 = dict({\"a\": 1, \"b\": 2}, c=3, d=4)\nd2 = dict([(\"a\", 1), (\"b\", 2)], c=3, d=4)\nprint(d1) # {'a': 1, 'b': 2, 'c': 3, 'd': 4}\nprint(d2) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 还可以根据已有字典创建新的字典\nd = {**{\"a\": 1, \"b\": 2}, \"c\": 3, **{\"d\": 4}}\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然通过调用 dict 也是可以的\n# 但是注意：** 这种方式本质上是把字典变成多个关键字参数\n# 所以里面的 key 一定要符合 Python 的变量命名规范\nd = dict(**{\"a\": 1, \"b\": 2}, c=3, **{\"d\": 4})\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} try: # 这种是不合法的，因为 **{1: 1} 等价于 1=1 d = dict(**{1: 1})\nexcept Exception as e: print(e) # keywords must be strings\n# 但下面是合法的\nd = {**{1: 1, 2: 2}}\nprint(d) # {1: 1, 2: 2} 字典的底层是借助哈希表实现的，关于哈希表我们一会儿说，总之字典添加元素、删除元素、查找元素等操作的平均时间复杂度是 O(1)。 我们来测试一下字典的执行效率吧，看看它和列表之间的区别。 import time\nimport numpy as np def test(count: int, value: int): \"\"\" :param count: 循环次数 :param value: 查询的元素 :return: \"\"\" # 包含一千个随机数的列表 lst = list(np.random.randint(0, 2 ** 30, size=1000)) # 基于列表构建一个字典 d = dict.fromkeys(lst) # 查询元素 value 是否在列表中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in lst t2 = time.perf_counter() print(\"列表查询耗时:\", round(t2 - t1, 2)) # 查询元素 value 是否在字典中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in d t2 = time.perf_counter() print(\"字典查询耗时:\", round(t2 - t1, 2)) # 分别查询一千次、一万次、十万次、二十万次\ntest(10 ** 3, 22333)\n\"\"\"\n列表查询耗时: 0.13\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 4, 22333)\n\"\"\"\n列表查询耗时: 1.22\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 5, 22333)\n\"\"\"\n列表查询耗时: 12.68\n字典查询耗时: 0.01\n\"\"\"\ntest(10 ** 5 * 2, 22333)\n\"\"\"\n列表查询耗时: 25.72\n字典查询耗时: 0.01\n\"\"\" 字典的查询速度非常快，从测试中我们看到，随着循环次数越来越多，列表所花费的总时间越来越长。但是字典由于查询所花费的时间极少，查询速度非常快，所以即便循环 50 万次，花费的总时间也不过才 0.01 秒左右。 此外字典还有一个特点，就是它的快不会受到数据量的影响，从含有一万个键值对的字典中查找，和从含有一千万个键值对的字典中查找，两者花费的时间几乎是没有区别的。 那么哈希表到底是什么样的数据结构，为什么能这么快呢？下面来分析一下。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 楔子","id":"168","title":"楔子"},"169":{"body":"映射型容器的使用场景非常广泛，基本上所有的主流语言都支持。例如 C++ 里面的 map 就是一种映射型容器，但它是基于红黑树实现的。红黑树是一种平衡二叉树，元素的插入、删除、查询等操作的时间复杂度均为 O(logN)，另外 Linux 的 epoll 也使用了红黑树。 而对于 Python 来讲，映射型容器指的就是字典，我们说字典在 Python 内部是被高度优化的。因为不光我们在用，虚拟机在运行时也在大量使用，比如类对象、自定义类的实例对象都有自己的属性字典，还有全局变量也是通过字典存储的。因此基于以上种种原因，Python 对字典的性能要求会更加苛刻。 所以 Python 字典采用的数据结构，在添加、删除、查询元素等方面肯定是要优于红黑树的，没错，就是哈希表。其原理是将 key 通过哈希函数进行运算，得到一个哈希值，再将这个哈希值映射成索引。 我们举例说明： 我们发现除了 key、value 之外，还有一个 index，因为哈希表本质上也是使用了索引。虽然数组在遍历的时候是个时间复杂度为 O(n) 的操作，但通过索引定位元素则是一个 O(1) 的操作，不管数组有多长，通过索引总是能瞬间定位到指定元素。 所以哈希表本质上就是一个数组，通过将 key 映射成一个数值，作为数组的索引，然后将键值对存在数组里面。至于它是怎么映射的，我们后面再谈，现在就假设是按照我们接下来说的方法映射的。 比如这里有一个能容纳 8 个元素的字典，如上图所示。我们先设置 d[\"koishi\"]=79，那么会对 \"koishi\" 这个字符串进行哈希运算，得到一个哈希值，然后再让哈希值对当前的总容量进行取模，这样的话是不是能够得到一个小于 8 的数呢？假设是 3，那么就存在索引为 3 的位置。 然后 d[\"scarlet\"]=95，按照同样的规则运算得到 6，那么就存在索引为 6 的位置；同理第三次设置 d[\"satori\"]=80，对字符串 satori 进行哈希、取模，得到 1，那么存储在索引为 1 的位置。 同理当我们根据键来获取值的时候，比如：d[\"satori\"]，那么同样会对字符串 \"satori\" 进行哈希、取模，得到索引发现是1，然后就把索引为 1 的 value 给取出来。 当然这种方式肯定存在缺陷，比如： 不同的 key 进行哈希、取模运算之后得到的结果一定是不同的吗？ 在运算之后得到索引的时候，发现这个位置已经有人占了怎么办？ 取值的时候，索引为 1，可如果索引为 1 对应的 key 和我们指定的 key 不一致怎么办？ 所以哈希运算是会冲突的，如果冲突，那么 Python 底层会改变策略重新映射，直到映射出来的索引没有人用。比如我们设置一个新的键值对 d[\"tomoyo\"]=88，可是 \"tomoyo\" 这个 key 映射之后得到的结果也是 1，而索引为 1 的地方已经被 key 为 \"satori\" 的键值对给占了，那么 Python 就会改变规则来对 \"tomoyo\" 重新映射，直到找到一个空位置。 但如果我们再次设置 d[\"satori\"]=100，那么对 satori 映射得到的结果也是 1，而 key 是一致的，那么就会把对应的值进行修改。 同理，当我们获取值的时候，比如 d[\"tomoyo\"]，那么对 key 进行映射，得到索引。但是发现该索引对应的 key 不是 \"tomoyo\" 而是 \"satori\"，于是改变规则（这个规则跟设置 key 冲突时，采用的规则是一样的），重新映射，得到新的索引，然后发现 key 是一致的，于是将值取出来。 所以从这里就已经能说明问题了，就是把 key 转换成数组的索引。可能有人问，这些键值对貌似不是连续的啊。对的，肯定不是连续的。并不是说你先存，你的索引就小、就在前面，这是由 key 进行哈希运算之后的结果决定的。 另外哈希表、或者说字典也会扩容，并且它还不是像列表那样，容量不够才扩容，而是当键值对个数达到容量的三分之二的时候就会扩容。 因为字典不可能会像列表那样，键值对之间是连续、一个一个挨在一起的。既然是哈希运算，得到的哈希值肯定是随机的，再根据哈希值映射出的索引也是随机的。那么在键值对个数达到容量三分之二的时候，计算出来的索引发生碰撞的概率会非常大，不可能等到容量不够了再去扩容，而是在键值对个数达到容量的三分之二时就要扩容，也就是申请一个更大的哈希表。 一句话总结：哈希表就是一种空间换时间的方法。 假设容量为 1024，那么就相当于数组有 1024 个位置，每个 key 都会映射成索引，找到自己的位置，将键值对存在里面。但很明显各自的位置是不固定的，肯定会空出来很多，但是无所谓，只要保证通过索引能在相应的位置找到它即可。 大量的文字会有些枯燥，我们用两张图来解释一下设置元素和获取元素的整个过程。 以上是设置元素，还是比较清晰的，果然图像是个好东西。再来看看获取元素： 以上就是哈希表的基本原理，说白了它就是个数组。存储键值对的时候，先将 key 映射成索引，然后基于索引找到数组中的指定位置，将键值对存进去。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 什么是哈希表","id":"169","title":"什么是哈希表"},"17":{"body":"通过 PyObject 和 PyVarObject，我们看到了所有对象的公共信息以及变长对象的公共信息。任何一个对象，不管它是什么类型，内部必有引用计数（ob_refcnt）和类型指针（ob_type）。任何一个变长对象，不管它是什么类型，内部除了引用计数和类型指针之外，还有一个表示元素个数的 ob_size。 显然目前没有什么问题，一切都是符合预期的，但是当我们顺着时间轴回溯的话，就会发现端倪。比如： 当在内存中创建对象、分配空间的时候，解释器要给对象分配多大的空间？显然不能随便分配，那么对象的内存信息在什么地方？ 对象是可以执行相关操作的，解释器怎么知道某个对象支持哪些操作呢？再比如一个整数可以和一个整数相乘，一个列表也可以和一个整数相乘，即使是相同的操作，但不同类型的对象执行也会有不同的效果，那么此时解释器又是如何进行区分的？ 想都不用想，这些信息肯定都在对象的类型对象中。因为占用的空间大小实际上是对象的一个元信息，这样的元信息和其所属类型是密切相关的，因此它一定会出现在与之对应的类型对象当中。至于支持的操作就更不用说了，我们平时自定义类的时候，功能函数都写在什么地方，显然都是写在类里面，因此一个对象支持的操作也定义在类型对象当中。 而将对象和它的类型对象关联起来的，毫无疑问正是该对象内部的 PyObject 的 ob_type 字段，也就是类型指针。我们通过对象的 ob_type 字段即可获取类型对象的指针，然后通过指针获取存储在类型对象中的某些元信息。 下面我们来看看类型对象在底层是怎么定义的。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 楔子","id":"17","title":"楔子"},"170":{"body":"目前介绍的正是 Python 早期所采用的哈希表，但是它有一个严重的问题，就是内存浪费严重。下一篇文章我们就来看看字典的底层结构，以及 Python 是如何对哈希表进行优化的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 小结","id":"170","title":"小结"},"171":{"body":"本篇文章来剖析一下字典的底层结构，看看它是怎么设计的，以及在设计的过程中都需要做哪些考量。另外字典是基于哈希表实现的，而传统的哈希表存在内存浪费的问题，那么字典又是如何优化的呢？带着这些问题，开始今天的内容。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 楔子","id":"171","title":"楔子"},"172":{"body":"Python 一切皆对象，字典也不例外，它在底层也由某个结构体表示。 // Include/cpython/dictobject.h\ntypedef struct { PyObject_HEAD Py_ssize_t ma_used; uint64_t ma_version_tag; PyDictKeysObject *ma_keys; PyObject **ma_values;\n} PyDictObject; 解释一下里面的字段的含义： PyObject_HEAD：对象的头部信息，里面包含了对象的引用计数和类型。 ma_used：字典的长度，它充当了 ob_size。 ma_version_tag：字典的版本号，对字典的每一次修改都会导致其改变。该字段主要用于字典的迭代器，以检测字典在迭代过程中是否被修改。 ma_keys：从定义上来看它是一个指针，指向了 PyDictKeysObject。而 Python 里面的哈希表分为两种，分别是 combined table 和 split table，即结合表和分离表。如果是结合表，那么键值对全部由 ma_keys 维护，此时 ma_values 为 NULL。 ma_values：如果是分离表，那么键由 ma_keys 维护，值由 ma_values 维护。而 ma_values 是一个二级指针，指向 PyObject * 类型的指针数组的首元素。 这里先解释一下结合表和分离表的由来。结合表的话，键和值会存在一起；分离表的话，键和值会存在不同的地方。那么问题来了，为什么要将哈希表分为两种呢？事实上，早期的哈希表只有结合表这一种，并且现在创建一个字典使用的也是结合表。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d = {\"a\": 1, \"b\": 2}\nprint( PyDictObject.from_address(id(d)).ma_values\n) # None 我们看到 ma_values 打印的结果是一个 None，证明是结合表，值不是由 ma_values 维护，而是和键一起，都由 ma_keys 负责维护。 而分离表是在 PEP-0412 中被引入的，主要是为了提高内存使用率，也就是让不同的字典共享相同的一组 key。比如自定义类的实例对象，它们默认都有自己的属性字典，如果对某个类多次实例化，那么改成分离表会更有效率。因为它们的属性名称是相同的，完全可以共享同一组 key；如果是结合表，那么每个实例的属性字典都要将相同的 key 单独保存一次，这显然是一种浪费。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] class A: pass a1 = A()\na2 = A() # 因为类型指定的是 void *，所以打印的结果是一串地址\n# 但我们看到输出不为 None，说明采用的确实是分离表\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_values, PyDictObject.from_address(id(a2.__dict__)).ma_values\n) # 139672411587664 139672411587280 # 然后再查看 ma_keys，既然是共享同一组 key\n# 那么打印的地址应该是一样的\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_keys, PyDictObject.from_address(id(a2.__dict__)).ma_keys\n) # 139672411702528 139672411702528 # 结果确实是一样的，不同实例对象的属性字典里面的 key 是共享的\n# 因为是同一个类的实例对象，属性字典的 key 是相同的，所以没必要将同一组 key 保存多次 以上就是结合表和分离表之间的区别，只需要知道分离表是 Python 为了提高内存使用率而专门引入的即可。我们平时自己创建的字典，使用的都是结合表，因此我们的重点也将会放在结合表身上。 而结合表的话，键值都由 ma_keys 维护，它是一个指向 PyDictKeysObject 的指针，因此玄机就隐藏在这个结构体里面。 // Include/cpython/dictobject.h\ntypedef struct _dictkeysobject PyDictKeysObject; // Objects/dict-common.h\nstruct _dictkeysobject { // key 的引用计数，也就是 key 被多少个字典所使用 // 如果是结合表，那么该字段始终是 1，因为结合表独占一组 key // 如果是分离表，那么该字段大于等于 1，因为分离表可以共享一组 key Py_ssize_t dk_refcnt; // 哈希表的大小、或者说长度，注意：dk_size 满足 2 的 n 次方 // 这样可将取模运算优化成按位与运算，也就是将 num % dk_size 优化成 num & (dk_size - 1) Py_ssize_t dk_size; // 哈希函数，用于计算 key 的哈希值，然后映射成索引 // 一个好的哈希函数应该尽可能少的产生冲突，并且哈希函数对哈希表的性能起着至关重要的作用 // 所以底层的哈希函数有很多种，会根据对象的种类选择最合适的一个 dict_lookup_func dk_lookup; // 键值对数组还可以添加多少个 entry（键值对） // 关于什么是键值对数组，以及它和哈希索引数组之间有什么区别，稍后会解释 Py_ssize_t dk_usable; // 键值对数组里面已经添加了多少个键值对 Py_ssize_t dk_nentries; // 哈希索引数组 char dk_indices[]; // 注：dk_indices 后面其实还有一个字段 dk_entries，只不过没有写在结构体里面 // 从字段名也可以看出，它表示键值对数组，因此它的类型就是个数组 // 然后数组里面存储的是键值对（entry），而键值对在底层由 PyDictKeyEntry 结构体实现 // 所以你可以认为 char dk_indices[] 的下面还有一个 PyDictKeyEntry dk_entries[]\n}; 字典的定义还是稍微有点复杂的，如果目前感到困惑，没有关系，稍后我们会一点点解释清楚。这里再来看看键值对长什么样子。 // Objects/dict-common.h\ntypedef struct { Py_hash_t me_hash; PyObject *me_key; PyObject *me_value;\n} PyDictKeyEntry; 显然 me_key 和 me_value 指向了键和值，我们之前说 Python 的变量、以及容器内部的元素都是泛型指针 PyObject *，这里也得到了证明。但是我们看到 entry 除了有键和值之外，还有一个 me_hash，它表示键对应的哈希值，这样可以避免重复计算。 至此，字典的整个底层结构就非常清晰了，我们画一张图，然后再来从头解释一下，并解答之前留下的疑问。 字典的真正实现藏在 PyDictKeysObject 中，它的内部包含两个关键数组：一个是哈希索引数组 dk_indices，另一个是键值对数组 dk_entries。 字典维护的键值对（entry）会按照先来后到的顺序保存在键值对数组中，而哈希索引数组则保存键值对在键值对数组中的索引。另外，哈希索引数组中的一个位置我们称之为一个槽，比如图中的哈希索引数组便有 8 个槽，其数量由 dk_size 字段维护。 假设我们创建一个空字典，注意：虽然字典是空的，但是容量已经有了，然后往里面插入键值对 \"komeiji\": 99 的时候，Python 会执行以下步骤： 将键值对保存在 dk_entries 中，由于初始字典是空的，所以会保存在 dk_entries 数组中索引为 0 的位置。 通过哈希函数计算出 \"komeiji\" 的哈希值，然后将哈希值映射成索引，假设是 6。 将 \"键值对\" 在 \"键值对数组\" 中的索引 0，保存在哈希索引数组中索引为 6 的槽里面。 然后当我们在查找键 \"komeiji\" 对应的值的时候，便可瞬间定位。过程如下： 通过哈希函数计算出 \"komeiji\" 的哈希值，然后映射成索引。因为在设置的时候索引是 6，所以在获取时，映射出来的索引肯定也是 6。 找到哈希索引数组中索引为 6 的槽，得到其保存的 0，这里的 0 对应键值对数组的索引。 找到键值对数组中索引为 0 的位置存储的 entry，然后判断 entry->me_key 和查找的 key 是否一致，不一致则重新映射。如果一致，则取出 me_value，然后返回。 由于哈希值计算以及数组索引查找均是 O(1) 的时间复杂度，所以字典的查询速度才会这么快。 另外前面介绍哈希表的时候，为了避免牵扯太多，说得相对简化了。比如 \"xxx\": 80，假设 \"xxx\" 映射出来的索引是 2，那么键值对就直接存在索引为 2 的地方。这实际上是简化了，因为这相当于把哈希索引数组和键值对数组组合在一块了，而早期的 Python 也确实是这么做的。 但是从上面字典的结构图中我们看到，实际上是先将键值对按照先来后到的顺序存在一个数组（键值对数组）中，然后再将它在键值对数组中的索引存放在另一个数组（哈希索引数组）的某个槽里面，因为 \"xxx\" 映射出来的是 2，所以就存在索引为 2 的槽里面。 而在查找的时候，映射出来的索引其实是哈希索引数组的索引。然后索引为 2 的槽又存储了一个索引，这个索引是键值对数组的索引，会再根据该索引从键值对数组里面获取指定的 entry。最后比较 key 是否相同、如果相同则返回指定的 value。 所以能看出两者整体思想是基本类似的，理解起来区别不大，甚至第一种方式实现起来还更简单一些。但为什么要采用后者这种实现方式，以及这两者之间的区别，我们下面来专门分析，之所以采用后者主要是基于内存的考量。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的底层结构","id":"172","title":"字典的底层结构"},"173":{"body":"在早期，哈希表并没有分成两个数组实现，而是只由一个键值对数组实现，这个数组也承担哈希索引数组的角色。 我们看到这种结构不正是我们在介绍哈希表时说的吗？键值对数组不仅负责存储 entry，同时也负责承载映射后的索引，而无需分成两个数组，这种方式似乎更简单、更直观。没错，Python 在早期确实是通过这种方式实现的哈希表，只是这种实现方式有一个弊端，就是太耗费内存了。 前面说了，基于 key 映射出的索引是随机的，所以肯定会存在索引冲突的情况，即不同的 key 映射到了同一个槽。并且随着存储的 entry 增多，冲突也会越频繁，性能也就越差。因此哈希表必须要预留一定的空间，而经过实践表明，预留的空间至少要占总容量的 1/3。换句话说，哈希表存储的 entry 的数量不能超过总容量的 2/3。 // Objects/dictobject.c\n#define USABLE_FRACTION(n) (((n) << 1)/3) 宏 USABLE_FRACTION 会根据哈希表的长度，或者说容量，计算出哈希表可存储的元素个数。以长度为 8 的哈希表为例，最多可以保存 5 个键值对，超出则需要扩容，显然这存在严重的内存浪费。 所以 Python 为了节省内存，想出了一个妙招。既然只能用 2/3，那就将键值对数组的空间变为原来的 2/3，只用来存储键值对（entry），而对 key 进行映射得到的索引则由另一个数组（哈希索引数组）来承载。假设映射出的索引是 4，那么就去找哈希索引数组中索引为 4 的槽，该槽存储的便是键值对在键值对数组中的索引。 之所以这么设计，是因为键值对数组里面一个元素要占用 24 字节，而哈希索引数组在容量不超过 255 的时候，里面一个元素只占一个字节，容量不超过 65535 的时候，里面一个元素只占两个字节，其它以此类推。所以哈希索引数组里面的元素大小比键值对数组要小很多，将哈希表分成两个数组（避免键值对数组的浪费）来实现会更加节省内存。我们可以举个例子计算一下，假设有一个容量为 65535 的哈希表。 如果是通过第一种方式，只用一个数组来存储的话： # 总共需要 1572840 字节\n>>> 65535 * 24\n1572840 # 除以 3, 会浪费 524280 字节\n>>> 65535 * 24 // 3\n524280\n>>> 如果是通过第二种方式，使用两个数组来存储的话： # 容量虽然是 65535\n# 但键值对数组是容量的 2 / 3\n# 然后加上哈希索引数组的大小\n>>> 65535 * 24 * 2 // 3 + 65535 * 2\n1179630\n>>> 所以一个数组存储比两个数组存储要多用 393210 字节的内存，因此 Python 选择使用两个数组来存储。 我们再以长度为 8 的哈希表为例，画一张图对比一下，由于哈希表长度为 8，那么它最多存储 5 个键值对。 如果哈希表只使用一个键值对数组，那么基于 key 映射出的索引就是键值对数组的索引，这种方式简单直观，但内存浪费严重，因为要浪费掉 1/3 的空间。于是为了解决这个问题，哈希表选择使用两个数组实现，分别是哈希索引数组和键值对数组。 哈希索引数组的长度就是哈希表的长度，key 映射之后的索引也是哈希索引数组的索引，只不过它存储的不再是键值对，而是键值对在键值对数组中的索引。那么问题来了，明明多了一个数组，为啥内存占用反而变少了呢？很明显，由于引入了哈希索引数组，键值对数组的长度可以减少到原来的 2/3。 因为相比键值对数组，哈希索引数组的内存占用非常低，引入它需要的成本远小于避免键值对数组浪费 1/3 所带来的收益，所以使用两个数组来实现哈希表是更加合理的。 总结： 哈希表本质上就是个数组，只不过 Python 选择使用两个数组实现，其中哈希索引数组的长度便是哈希表的容量，而该长度由 dk_size 字段维护。 由于哈希表最多使用 2/3，那么就只为键值对数组申请 2/3 容量的空间。对于容量为 8 的哈希表，那么哈希索引数组的长度就是 8，键值对数组的长度就是 5。 dk_usable 字段表示键值对数组还可以容纳的 entry 的个数，所以它的初始值也是 5。 dk_nentries 字段表示当前已存在的 entry 的数量，假设哈希表，或者说键值对数组存储了 3 个键值对，那么 dk_nentries 就是 3。而 dk_usable 则会变成 5 - 3 等于 2，因为它表示键值对数组还可以容纳多少 entry。 咦，前面介绍 PyDictObject 的时候，看到里面有一个 ma_used 字段，表示字典的长度。那么 dk_nentries 和 ma_used 有啥区别呢，从字面意思上看，两者的含义貌似是等价的，关于这一点后续再解释。 最后就是 dk_indices 和 dk_entries，它们表示哈希索引数组和键值对数组。到此我们就把每个字段的含义又重新回顾了一遍，现在再来看是不是就清晰多了呢。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 哈希表的内存优化","id":"173","title":"哈希表的内存优化"},"174":{"body":"我们知道 Python 从 3.6 开始，字典的遍历是有序的，那么这是怎么实现的呢？ 其实很简单，在存储时，虽然映射之后的索引是随机的，但键值对本身始终是按照先来后到的顺序被添加进键值对数组中。而字典在 for 循环时，会直接遍历键值对数组，所以遍历的结果是有序的。但即便如此，我们也不应该依赖此特性。 还是以之前的图为例，我们顺序写入三个键值对，key 分别是 \"a\"、\"b\"、\"c\"： 早期的哈希表只有一个键值对数组，而键值对在存储时本身就是无序的，那么遍历的结果自然也是无序的。对于当前来说，遍历的结果就是 \"b\"、\"a\"、\"c\"。 但从 3.6 开始，键值对数组中的键值对，和添加顺序是一致的。而遍历时，会直接遍历键值对数组，因此遍历的结果是有序的。对于当前来说，遍历的结果就是 \"a\"、\"b\"、\"c\"。 当然，如果你是 Python 的设计者，希望遍历依旧不保持有序的话，那么该怎么做呢？很简单，可以先遍历哈希索引数组，将存储的有效索引依次取出，对于当前来说就是 1、0、2。然后基于这些索引，从键值对数组中获取键值对，那么遍历的结果也是 \"b\"、\"a\"、\"c\"。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典遍历的有序性","id":"174","title":"字典遍历的有序性"},"175":{"body":"下面来分析一下字典占用的内存大小，首先字典和列表一样都有容量的概念，由于空间已经申请了，不管有没有使用，大小都必须算进去。而字典的容量策略相比列表要简单很多，因为大小要满足 2 的 n 次方，所以容量一定按照 8、16、32、64、······ 进行变化。 注意：字典的容量（或者说哈希表的容量）指的是内部哈希索引数组的长度，它要满足 2 的 n 次方，从而将取模运算优化成按位与运算。当哈希索引数组存储的元素（键值对数组的索引）个数达到了总长度的 2/3，同时也意味着键值对数组已经满了，那么说明字典（哈希表）该扩容了。 知道了容量规则，我们来看一下字典的内存大小怎么计算。 typedef struct { PyObject_HEAD // 16 字节 Py_ssize_t ma_used; // 8 字节 uint64_t ma_version_tag; // 8 字节 PyDictKeysObject *ma_keys; // 8 字节 PyObject **ma_values; // 8 字节\n} PyDictObject;\n// 所以 PyDictObject 实例占 48 字节 struct _dictkeysobject { Py_ssize_t dk_refcnt; // 8 字节 Py_ssize_t dk_size; // 8 字节 dict_lookup_func dk_lookup; // 8 字节 Py_ssize_t dk_usable; // 8 字节 Py_ssize_t dk_nentries; // 8 字节 char dk_indices[]; // 隐藏字段 dk_entries\n}; // 如果不算哈希索引数组 dk_indices 和键值对数组 dk_entries\n// 那么 PyDictKeysObject 实例占 40 个字节 然后是剩余的两个数组，一个是哈希索引数组 dk_indices，里面 1 个元素可能占 1 字节、2 字节、或 4 字节；还有一个键值对数组 dk_entries，里面一个元素占 24 字节。所以对于容量为 n 的字典来说： 如果 n < 256，字典大小等于 48 + 40 + n + n * 2 // 3 * 24 如果 256 <= n < 65536，字典大小等于 48 + 40 + n * 2 + n * 2 // 3 * 24 如果 n >= 65536，字典大小等于 48 + 40 + n * 4 + n * 2 // 3 * 24 所以对于一个容量为 8 的字典，它的大小就是 48 + 40 + 8 + 120 = 216。 # 字典的初始容量为 8，所以大小为 216\n>>> dict().__sizeof__()\n216 # 注：如果你是通过字面量的方式创建空字典，那么容量是 0\n# 显然大小就是 48 字节，因为此时 ma_keys 为 NULL\n>>> {}.__sizeof__()\n48 那么问题来了，如果一个字典包含 78 个键值对，那么这个字典占多大内存呢？既然有 78 个键值对，那么键值对数组 dk_entries 的长度至少为 78，而它又等于哈希表容量的 2/3，所以哈希表的长度至少为 117。由于哈希表的长度满足 2 的 n 次幂，所以我们只需找到大于等于 117 的最小 2 的幂次方数即可，显然这个数是 128。 所以大小有了，包含 78 个键值对的字典所占的内存大小等于 48 + 40 + 128 + 128 * 2 // 3 * 24。 >>> 48 + 40 + 128 + 128 * 2 // 3 * 24\n2256\n>>> dict.fromkeys(range(78)).__sizeof__()\n2256 结果没有问题，再来个复杂点的，对于包含 12345 个键值对的字典，占用多大内存呢？ >>> import math\n>>> math.log2(12345 * 3 / 2)\n14.1766017167513\n>>> 2 ** 15\n32768 计算结果表明，对于包含 12345 个键值对的字典，哈希表的长度至少为 2 的 14.17... 次方，而实际的长度显然是 2 的 15 次方，那么大小就出来了。另外注意：因为长度超过了 255，所以哈希索引数组中的一个元素占两字节。 >>> 48 + 40 + 32768 * 2 + 32768 * 2 // 3 * 24\n589904\n>>> dict.fromkeys(range(12345)).__sizeof__()\n589904 结果和我们分析的一样，以上我们就计算出了字典的内存大小，你也可以自己创建个字典测试一下。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的内存大小","id":"175","title":"字典的内存大小"},"176":{"body":"通过研究字典的具体实现，我们可以得出以下结论： 字典是一种高效的映射型容器，能够以 O(1) 的时间复杂度执行查询和写入操作； 字典之所以这么快，是因为它由哈希表实现。但快是要付出代价的，哈希表必须保证一定的稀疏性，否则会频繁出现索引冲突，导致哈希表性能下降，因为索引映射是随机的； 既然哈希表要保证稀疏性，就意味着内存开销大，因为存在内存浪费。 但 Python 为优化内存使用，选择基于两个数组来实现哈希表，通过避免键值对数组的浪费，来减少内存占用； 键值对数组里的 entry 除了保存 key 和 value 之外，还保存了 key 的哈希值。 以上就是字典的底层实现，但是还没有结束，哈希表的背后还隐藏了很多细节，我们就下一篇文章再聊吧。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 小结","id":"176","title":"小结"},"177":{"body":"通过研究字典的底层实现，我们找到了字典快速且高效的秘密，就是哈希表。而提到哈希表，必然绕不开哈希值，因为它决定了映射之后的索引。 如果想计算对象的哈希值，那么要保证对象必须是可哈希的。如果不可哈希，那么它就无法计算哈希值，自然也就无法作为字典的 key。那什么样的对象是可哈希的呢？ 因为哈希值不能发生改变，所以对象必须是不可变对象； 当对象的哈希值相等时，要判断对象是否相等，所以对象必须实现 __eq__ 方法； 所以如果对象满足不可变、并且实现了 __eq__ 方法，那么它就是可哈希的，只有这样的对象才能作为字典的 key 或者集合的元素。 像整数、浮点数、字符串等内置的不可变对象都是可哈希的，可以作为字典的 key。而像列表、字典等可变对象则不是可哈希的，它们不可以作为字典的 key。然后关于元组需要单独说明，如果元组里面的元素都是可哈希的，那么该元组也是可哈希的，反之则不是。 # 键是可哈希的就行，值是否可哈希则没有要求\nd = {1: 1, \"xxx\": [1, 2, 3], 3.14: 333} # 列表是可变对象，因此无法哈希\ntry: d = {[]: 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" # 元组也是可哈希的\nd = {(1, 2, 3): 123} # 但如果元组里面包含了不可哈希的对象\n# 那么整体也会变成不可哈希对象\ntry: d = {(1, 2, 3, []): 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" 而我们自定义类的实例对象也是可哈希的，并且哈希值是通过对象的地址计算得到的。 class Some: pass s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n8744065697364 8744065697355\n\"\"\" 当然 Python 也支持我们重写哈希函数，比如： class Some: def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n123 123\n\"\"\"\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x0000029C0ED045E0>: 1, <__main__.Some object at 0x0000029C5E116F20>: 2}\n\"\"\" 因为哈希值一样，映射出来的索引自然也是相同的，所以在作为字典的 key 时，会发生冲突。由于类的实例对象之间默认不相等，因此会改变规则重新映射，找一个可以写入的位置。 如果两个对象相等，它们的哈希值一定也相等。 注意：我们自定义类的实例对象默认都是可哈希的，但如果类里面重写了 __eq__，并且没有重写 __hash__ 的话，那么这个类的实例对象就不可哈希了。 class Some: def __eq__(self, other): return True try: hash(Some())\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'Some' \"\"\" 为什么会有这种现象呢？首先上面说了，在没有重写 __hash__ 方法的时候，哈希值默认是根据对象的地址计算得到的。而且对象如果相等，那么哈希值一定是一样的，并且不可变。 但我们重写了 __eq__，相当于控制了 == 操作符的比较结果，两个对象是否相等就由我们来控制了，可哈希值却还是根据地址计算得到的。因为两个对象地址不同，所以哈希值不同，但是对象却可以相等、又可以不相等，这就导致了矛盾。所以在重写了 __eq__、但是没有重写 __hash__ 的情况下，其实例对象便不可哈希了。 但如果重写了 __hash__，那么哈希值就不再通过地址计算了，因此此时是可以哈希的。 class Some: def __eq__(self, other): return True def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x00000202D7D945E0>: 2}\n\"\"\" 我们看到字典里面只有一个元素，因为重写了 __hash__ 方法之后，计算得到的哈希值都是一样的。如果没有重写 __eq__，实例对象之间默认是不相等的，因此哈希值一样，但是对象不相等，那么会重新映射。但我们重写了 __eq__，返回的结果是 True，所以 Python 认为对象是相等的，那么由于 key 的不重复性，只会保留一个键值对。 但需要注意的是，在比较相等时，会先比较地址是否一样，如果地址一样，那么哈希表会直接认为相等。 class Some: def __eq__(self, other): return False def __hash__(self): return 123 def __repr__(self): return \"Some Instance\" s1 = Some()\n# 我们看到 s1 == s1 为 False\nprint(s1 == s1)\n\"\"\"\nFalse\n\"\"\"\n# 但是只保留了一个 key，咦，两个 key 不相等，难道不应该重新映射吗？\n# 原因就是刚才说的，在比较是否相等之前，会先判断地址是否一样\n# 如果地址一样，那么认为是同一个 key，直接判定相等\nprint({s1: 1, s1: 2})\n\"\"\"\n{Some Instance: 2}\n\"\"\" s2 = Some()\n# 此时会保留两个 key，因为 s1 和 s2 地址不同，s1 == s2 也为 False\n# 所以哈希表认为这是两个不同的 key\n# 但由于哈希值一样，那么映射出来的索引也一样\n# 因此写入 s2: 2 时相当于发生了索引冲突，于是会重新映射\n# 但总之这两个 key 都会被保留\nprint({s1: 1, s2: 2}) \"\"\"\n{Some Instance: 1, Some Instance: 2}\n\"\"\" 同样的，我们再来看一个 Python 字典的例子。 d = {1: 123} d[1.0] = 234\nprint(d) # {1: 234} d[True] = 345\nprint(d) # {1: 345} 天哪噜，这是咋回事？首先整数在计算哈希值的时候，得到的结果就是其本身；而浮点数显然不是，但如果浮点数的小数点后面是 0，那么它和整数是等价的。 因此 1 和 1.0 的哈希值一样，并且两者也是相等的，因此它们被视为同一个 key，所以相当于是更新。同理 True 也一样，因为 bool 继承自 int，所以它等价于 1，比如：9 + True = 10。因此 True 和 1 相等，并且哈希值也相等，那么索引 d[True] = 345 同样相当于更新。 但是问题来了，值更新了我们可以理解，字典里面只有一个元素也可以理解，可为什么 key 一直是 1 呢？理论上最终结果应该是 True 才对啊。其实这算是 Python 偷了个懒吧（开个玩笑），因为 key 的哈希值是一样的，并且也相等，所以只会更新 value，而不会修改 key。 为了加深理解，我们再举个例子： d = {\"高老师\": 666} class A: def __hash__(self): return hash(\"高老师\") def __eq__(self, other): return True # A() == \"高老师\" 为 True，两者哈希值也一样\n# 所以相当于对 key 进行更新\nd[A()] = 777\nprint(d) # {'高老师': 777} print(d[\"高老师\"]) # 777\nprint(d[A()]) # 777 只要两个对象相等，并且哈希值相等，那么对于哈希表来说，它们就是同一个 key。 另外我们反复在提哈希值，而哈希值是通过哈希函数运算得到的，一个理想的哈希函数要保证哈希值尽量均匀地分布于整个哈希空间中，越是相近的值，其哈希值差别应该越大。还是那句话，哈希函数对哈希表的好坏起着至关重要的作用。 以上我们就详细地聊了聊对象的哈希值，如果对象可以计算哈希值，那么它一定实现了 __hash__ 方法，而内置的不可变对象都实现了。另外内置的哈希函数 hash，本质上也是调用了 __hash__。 print(hash(\"hello\"))\nprint(\"hello\".__hash__())\n\"\"\"\n-7465190714692855315\n-7465190714692855315\n\"\"\" 下一篇文章来聊一聊索引冲突是怎么解决的？ 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"41. 什么是可哈希对象，它的哈希值是怎么计算的？","id":"177","title":"41. 什么是可哈希对象，它的哈希值是怎么计算的？"},"178":{"body":"两个对象的哈希值相等，那么映射出的索引肯定相同。而如果哈希值不相等，映射出的索引也有可能相同，因为与哈希值空间相比，哈希表的槽位是非常有限的。如果不同的对象在经过映射之后，生成的索引相同，或者说它们被映射到了同一个槽，那么便发生了索引冲突。 解决索引冲突的常用方法有两种：分离链接法和开放寻址法。 分离链接法比较简单，如果有多个键值对映射到同一槽位，那么就用链表将它们串起来。然后是开放寻址法，这也是 Python 使用的方法，我们详细介绍一下。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 楔子","id":"178","title":"楔子"},"179":{"body":"首先将 key 映射成索引，但如果发现该索引对应的哈希槽被占了，那么就尝试另一个。 new_key 被映射到了索引为 5 的槽，但是该槽已经存储了键值对数组的索引，即该槽被占了。如果是分离链接法，那么会使用链表将两个 entry 串起来，但开放寻址法则是选择一个新的槽，也就是重新找个坑。 那么问题来了，新的槽要怎么找呢？一般来说，会在首槽的基础上增加一个偏移量，得到新的槽，如果还冲突，那么继续增加偏移量，直到找到一个可用的槽。总的来说就是一个不断探测的过程，每一次探测都会尝试增加偏移量。 所以新的问题又产生了，每次增加的偏移量是多少呢？其实这个问题取决于具体实现，如果偏移量是线性增加的，我们称之为线性探测；如果偏移量是平方增加的，我们称之为平方探测。 但不管是线性探测，还是平方探测，其实都不够好。因为偏移量始终是以一种固定的模式增加，这就导致映射到同一槽位的两个 key 的探测序列是相同的。 比如这里的 key1 和 key2，它们的哈希值不同，但都映射到了索引为 2 的槽，这是完全正常的，因为哈希表的槽位有限。而由于偏移量的增加方式是固定的，比如这里每次都增加 2，再加上首槽相同，因此它们的探测序列也相同，显然这会导致后续出现多次冲突。 所以 Python 对此进行了优化，探测函数在发现索引冲突时，不会简单地增加一个偏移量，而是会参考对象的哈希值，计算下一个候选位置，这就大大降低了冲突的可能性。 Python 的这种做法被称为迭代探测，当然迭代探测也属于开放寻址法的一种。所以当出现索引冲突时，Python 并不是简简单单地加上一个偏移量，而是使用专门设计的探测函数进行二次探查，也就是之前说的改变规则、重新映射，然后在函数内部会参考对象的哈希值来计算出一个新的索引。 在 dictobject.c 文件开头有着大量的注释，对字典进行了全局性的概括，当然具体细节我们都会详细说明。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 开放寻址法","id":"179","title":"开放寻址法"},"18":{"body":"PyObject 的 ob_type 字段的类型是 PyTypeObject *，所以类型对象由 PyTypeObject 结构体负责实现，看一看它长什么样子。 // Include/cpython/object.h typedef struct _typeobject { PyObject_VAR_HEAD const char *tp_name; Py_ssize_t tp_basicsize, tp_itemsize; destructor tp_dealloc; Py_ssize_t tp_vectorcall_offset; getattrfunc tp_getattr; setattrfunc tp_setattr; PyAsyncMethods *tp_as_async; reprfunc tp_repr; PyNumberMethods *tp_as_number; PySequenceMethods *tp_as_sequence; PyMappingMethods *tp_as_mapping; hashfunc tp_hash; ternaryfunc tp_call; reprfunc tp_str; getattrofunc tp_getattro; setattrofunc tp_setattro; PyBufferProcs *tp_as_buffer; unsigned long tp_flags; const char *tp_doc; traverseproc tp_traverse; inquiry tp_clear; richcmpfunc tp_richcompare; Py_ssize_t tp_weaklistoffset; getiterfunc tp_iter; iternextfunc tp_iternext; struct PyMethodDef *tp_methods; struct PyMemberDef *tp_members; struct PyGetSetDef *tp_getset; struct _typeobject *tp_base; PyObject *tp_dict; descrgetfunc tp_descr_get; descrsetfunc tp_descr_set; Py_ssize_t tp_dictoffset; initproc tp_init; allocfunc tp_alloc; newfunc tp_new; freefunc tp_free; inquiry tp_is_gc; PyObject *tp_bases; PyObject *tp_mro; PyObject *tp_cache; PyObject *tp_subclasses; PyObject *tp_weaklist; destructor tp_del; unsigned int tp_version_tag; destructor tp_finalize; vectorcallfunc tp_vectorcall; Py_DEPRECATED(3.8) int (*tp_print)(PyObject *, FILE *, int); #ifdef COUNT_ALLOCS Py_ssize_t tp_allocs; Py_ssize_t tp_frees; Py_ssize_t tp_maxalloc; struct _typeobject *tp_prev; struct _typeobject *tp_next;\n#endif\n} PyTypeObject; 类型对象在底层对应的是 struct _typeobject，或者说 PyTypeObject，它保存了实例对象的元信息。 所以不难发现，无论是 int、str、dict 等内置类型，还是使用 class 关键字自定义的类型，它们在 C 的层面都是由 PyTypeObject 这个结构体实例化得到的，只不过内部字段的值不同，PyTypeObject 结构体在实例化之后得到的类型对象也不同。 然后我们来看看 PyTypeObject 里面的字段都代表啥含义，字段还是比较多的，我们逐一介绍。 PyObject_VAR_HEAD 宏，会被替换为 PyVarObject，所以类型对象是一个变长对象。因此类型对象也有引用计数和类型，这与我们前面分析的是一致的。 tp_name 对应 Python 中类型对象的 __name__ 属性，即类型对象的名称。 # 类型对象在底层对应的是 PyTypeObject 结构体实例\n# 它的 tp_name 字段表示类型对象的名称\nprint(int.__name__) # int\n# 动态创建一个类\nA = type(\"我是 A\", (object,), {})\nprint(A.__name__) # 我是 A 所以任何一个类型对象都有 __name__ 属性，也就是都有名称。 tp_basicsize，tp_itemsize tp_basicsize：表示创建实例对象所需的基本内存大小； tp_itemsize：如果对象是变长对象，并且元素保存在对应的结构体内部，比如元组，那么 tp_itemsize 表示内部每个元素的内存大小。如果是定长对象，或者虽然是变长对象，但结构体本身不保存数据，而是只保存了一个指针，那么 tp_itemsize 为 0； tp_dealloc 析构函数，对应 Python 中类型对象的 __del__，会在实例对象被销毁时执行。 tp_vectorcall_offset 如果想调用一个对象，那么它的类型对象要定义 __call__ 函数。 class A: def __call__(self, *args, **kwargs): return \"被调用了\" a = A()\n# 如果调用 a，那么 type(a) 要定义 __call__ 函数\nprint(a())\n\"\"\"\n被调用了\n\"\"\"\n# 底层会转成如下逻辑\nprint(A.__call__(a))\n\"\"\"\n被调用了\n\"\"\" # 函数也是一个实例对象，它能被调用\n# 说明 type(函数) 也一定实现了 __call__\ndef some_func(name, age): return f\"name: {name}, age: {age}\"\n# 函数的类型是 function\nprint(type(some_func))\n\"\"\"\n<class 'function'>\n\"\"\"\n# 调用函数\nprint(some_func(\"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\"\n# 也可以这么做\nprint(type(some_func).__call__(some_func, \"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\" 以上就是对象最通用的调用逻辑，但通用也意味着平庸，这种调用方式的性能是不高的。自定义类的实例对象还好，因为需要支持调用的场景不多，而函数则不同，尽管它也是实例对象，但它生下来就是要被调用的。如果函数调用也走通用逻辑的话，那么效率不高，因此 Python 从 3.8 开始引入了 vectorcall 协议，即矢量调用协议，用于优化和加速函数调用。相比常规调用，矢量调用具备如下优势： 避免创建临时元组来传递参数 减少参数打包/解包的开销 支持关键字参数的快速处理 总之当一个对象被调用时，如果它支持 vectorcall 协议，那么会通过 tp_vectorcall_offset 找到实现矢量调用的函数指针。 注意：vectorcall 函数指针定义在实例对象中，而 tp_vectorcall_offset 字段维护了 vectorcall 函数指针在实例对象中的偏移量，该偏移量用于定位到一个特定的函数指针，这个函数指针符合 vectorcall 协议。 如果类型对象的 tp_vectorcall_offset 为 0，表示其实例对象不支持矢量调用，因此会退化为常规调用，即通过类型对象的 __call__ 进行调用。 tp_getattr，tp_setattr 对应 Python 中类型对象的 __getattr__ 和 __setattr__，用于操作实例对象的属性。但这两个字段已经不推荐使用了，因为它要求在操作属性时，属性名必须为 C 字符串，以及不支持通过描述符协议处理属性。 所以这两个字段主要用于兼容旧版本，现在应该使用 tp_getattro 和 tp_setattro。 tp_as_number、tp_as_sequence、tp_as_mapping、tp_as_async tp_as_number：实例对象为数值时，所支持的操作。这是一个结构体指针，指向的结构体中的每一个字段都是一个函数指针，指向的函数就是对象可以执行的操作，比如四则运算、左移、右移、取模等等。 tp_as_sequence：实例对象为序列时，所支持的操作，也是一个结构体指针。 tp_as_mapping：实例对象为映射时，所支持的操作，也是一个结构体指针。 tp_as_async：实例对象为协程时，所支持的操作，也是一个结构体指针。 tp_repr、tp_str 对应 Python 中类型对象的 __repr__ 和 __str__，用于控制实例对象的打印输出。 tp_hash 对应 Python 中类型对象的 __hash__，用于定义实例对象的哈希值。 tp_call 对应 Python 中类型对象的 __call__，用于控制实例对象的调用行为。当然这属于常规调用，而对象不仅可以支持常规调用，还可以支持上面提到的矢量调用（通过减少参数传递的开销，提升调用性能）。 但要注意的是，不管使用哪种调用协议，对象调用的行为必须都是相同的。因此一个对象如果支持矢量调用，那么它也必须支持常规调用，换句话说对象如果实现了 vectorcall，那么它的类型对象也必须实现 tp_call。 如果你在实现 vectorcall 之后发现它比 tp_call 还慢，那么你就不应该实现 vectorcall，因为实现 vectorcall 是有条件的，当条件不满足时性能反而会变差。 tp_getattro，tp_setattro 对应 Python 中类型对象的 __getattr__ 和 __setattr__。 tp_as_buffer 指向 PyBufferProcs 类型的结构体，用于共享内存。通过暴露出一个缓冲区，可以和其它对象共享同一份数据，因此当类型对象实现了 tp_as_buffer，我们也说其实例对象实现了缓冲区协议，举个例子。 import numpy as np buf = bytearray(b\"abc\")\n# 和 buf 共享内存\narr = np.frombuffer(buf, dtype=\"uint8\")\nprint(arr) # [97 98 99]\n# 修改 buf\nbuf[0] = 255\n# 会发现 arr 也改变了，因为它和 buf 共用一块内存\nprint(arr) # [255 98 99] 所以 tp_as_buffer 主要用于那些自身包含大量数据，且需要允许其它对象直接访问的类型。通过实现缓冲区协议，其它对象可以直接共享数据，而无需事先拷贝，这在处理大型数据或进行高性能计算时非常有用。 关于缓冲区协议，后续还会详细介绍。 tp_flags 对应 Python 中类型对象的 __flags__，负责提供类型对象本身的附加信息，通过和指定的一系列标志位进行按位与运算，即可判断该类型是否具有某个特征。 那么标志位都有哪些呢？我们介绍几个常见的。 // Include/object.h // 类型对象的内存是否是动态分配的\n// 像内置的类型对象属于静态类，它们不是动态分配的\n#define Py_TPFLAGS_HEAPTYPE (1UL << 9)\n// 类型对象是否允许被继承\n#define Py_TPFLAGS_BASETYPE (1UL << 10)\n// 类型对象的实例对象是否参与垃圾回收\n#define Py_TPFLAGS_HAVE_GC (1UL << 14)\n// 类型对象是否是抽象基类\n#define Py_TPFLAGS_IS_ABSTRACT (1UL << 20) 我们通过 Python 来演示一下。 # 是否是自定义的动态类\nPy_TPFLAGS_HEAPTYPE = 1 << 9\nclass A: pass\n# 如果与运算的结果为真，则表示是动态类，否则不是\nprint(A.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n512\n\"\"\"\nprint(int.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n0\n\"\"\" # 类型对象是否允许被继承\nPy_TPFLAGS_BASETYPE = 1 << 10\n# object 显然允许被继承，因此与运算的结果为真\nprint(object.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n1024\n\"\"\"\n# 但 memoryview 就不允许被继承\ntry: class B(memoryview): pass\nexcept TypeError as e: print(e) \"\"\" type 'memoryview' is not an acceptable base type \"\"\"\nprint(memoryview.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n0\n\"\"\" # 类型对象的实例对象是否参与垃圾回收\nPy_TPFLAGS_HAVE_GC = 1 << 14\n# int 的实例对象（整数）不会产生循环引用，所以不会参与垃圾回收\nprint(int.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n0\n\"\"\"\n# 但列表是会参与垃圾回收的\nprint(list.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n16384\n\"\"\" # 类型对象是否是抽象基类\nPy_TPFLAGS_IS_ABSTRACT = 1 << 20\nfrom abc import ABCMeta, abstractmethod\n# 显然 C 不是抽象基类，而 D 是\nclass C: pass\nclass D(metaclass=ABCMeta): @abstractmethod def foo(self): pass\nprint(C.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n0\n\"\"\"\nprint(D.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n1048576\n\"\"\" 所以这就是 tp_flags 的作用，它负责描述一个类型对象都具有哪些额外特征。 tp_doc 对应 Python 中类型对象的 __doc__。 class People: \"\"\"以前我没得选\"\"\" print(People.__doc__)\n\"\"\"\n以前我没得选\n\"\"\" 这个比较简单。 tp_traverse，tp_clear 这两个字段是一对，负责参与垃圾回收机制。 tp_traverse：用于标记阶段，通过遍历实例对象所引用的其它对象，确定对象之间的引用关系，帮助垃圾回收器识别出所有活跃的对象和出现循环引用的对象。 tp_clear：用于清除阶段，负责减少出现循环引用的对象的引用计数。 tp_richcompare 负责实现对象的比较逻辑，包含 >、>=、<、<=、!=、==。 tp_weaklistoffset 实例对象的弱引用列表在实例对象中的偏移量，如果 tp_weaklistoffset 为 0，则表示实例对象不支持弱引用。 tp_iter、tp_iternext 对应 Python 中类型对象的 __iter__ 和 __next__。 tp_methods 负责保存类型对象里的成员函数，我们以 list 为例。 tp_members 负责指定可以绑定在实例对象上的属性，我们使用 class 关键字定义动态类的时候，会在 __init__ 函数中给实例对象绑定属性，而对于底层 C 来说，需要通过 tp_members 字段。 以 slice 为例，它负责创建一个切片。 lst = list(range(10))\nprint(lst[1: 7: 2]) # [1, 3, 5]\n# 等价于\nprint(lst[slice(1, 7, 2)]) # [1, 3, 5] slice 是一个底层实现好的静态类，接收 start、end、step 三个参数，所以它底层的 tp_members 就是这么定义的。 对于静态类而言，可以给 self 绑定哪些属性、以及类型是什么，都已经事先在 tp_members 里面写死了，后续不可以新增或删除属性。 s = slice(1, 7, 2)\n# 静态类的实例对象不可以新增或删除属性\ntry: s.xx = \"xx\"\nexcept AttributeError as e: print(e) \"\"\" 'slice' object has no attribute 'xx' \"\"\" # 至于能否修改，则看定义属性时是否要求属性是 READONLY\n# 对于 slice 来说，它的三个属性都是 READONLY，所以不能修改\ntry: s.start = 2\nexcept AttributeError as e: print(e) \"\"\" readonly attribute \"\"\" 但使用 class 自定义的动态类而言，新增、删除、修改属性都是可以的，至于里面的更多细节，后续在介绍类的时候会详细剖析。 tp_getset 指向一个 PyGetSetDef 结构体数组，里面的每个结构体都定义了一个属性的名称、获取该属性的函数、设置该属性的函数、属性的文档字符串。 name：属性的名称，Python 代码可以通过该名称来访问属性。 get：属性的 getter 函数，如果设置了这个函数，Python 代码读取属性时会调用它。 set：属性的 setter 函数，如果设置了这个函数，Python 代码修改属性时会调用它。 doc：属性的文档字符串，为属性提供描述信息。 closure：一个 void * 指针，用于传递额外的信息给 getter 和 setter，不常用。 所以我们发现 tp_getset 的作用不就类似于 @property 装饰器吗？tp_getset 数组里面的每个结构体负责实现一个 property 属性。 tp_base 对应 Python 中类型对象的 __base__，返回继承的第一个父类。 tp_dict 对应 Python 中类型对象的 __dict__，即属性字典。 tp_descr_get、tp_descr_set 对应 Python 中类型对象的 __get__ 和 __set__，用于实现描述符。 tp_dictoffset 注意它和 tp_dict 的区别，tp_dict 表示类型对象的属性字典，而 tp_dictoffset 表示实例对象的属性字典在实例对象中的偏移量。 tp_init 对应 Python 中类型对象的 __init__，用于实例对象属性的初始化。 tp_alloc 负责为实例对象申请内存，申请多大呢？取决于 tb_basicsize 和 tp_itemsize。 tp_new 对应 Python 中类型对象的 __new__，即构造函数，在 tp_new 内部会调用 tp_alloc 为实例对象申请内存。 tp_free 内存释放函数，负责释放实例对象所占的内存，注意它和 tp_dealloc 的区别与联系。tp_dealloc 表示析构函数，当对象的引用计数降到零的时候执行，内部会负责如下工作。 减少引用的其它对象的引用计数； 释放对象拥有的资源，比如文件句柄或网络连接； 调用内存释放函数来释放对象本身占用的内存，这一步由 tp_free 来完成。 所以要注意这几个字段之间的区别，我们再总结一下。 tp_is_gc 指示该类型对象的实例对象是否参与垃圾回收。 // Objects/typeobject.c\nunsigned long\nPyType_GetFlags(PyTypeObject *type)\n{ return type->tp_flags;\n} // Include/object.h\n#define PyType_HasFeature(t,f) ((PyType_GetFlags(t) & (f)) != 0) // Include/objimpl.h\n// 显然只需判断 tp_flags & Py_TPFLAGS_HAVE_GC 是否不等于 0 即可\n#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC) 如果参与垃圾回收，那么 tp_flags & Py_TPFLAGS_HAVE_GC 的结果不等于 0。 tp_bases 对应 Python 中类型对象的 __bases__，返回一个元组，里面包含直接继承的所有父类。 tp_mro 对应 Python 中类型对象的 __mro__，返回一个元组，里面包含自身以及直接继承和间接继承的所有父类，直到 object。 注意：返回的元组中的类是有顺序关系的，它基于 C3 线性算法生成，定义了方法解析的顺序。当 Python 需要查找方法或属性时，将按照此顺序进行搜索。 tp_cache 该字段已废弃，这里不做介绍。 tp_subclasses 等价于 Python 中类型对象的 __subclasses__，会返回继承该类的所有子类。 class A: pass class B(A): pass class C(B): pass print(A.__subclasses__())\n\"\"\"\n[<class '__main__.B'>]\n\"\"\" 但是只返回直接继承的子类，间接继承的不返回，比如这里只返回了 B，而 C 没有返回。 tp_weaklist 类型对象的弱引用列表，注意它和前面提到的 tp_weaklistoffset 的区别。tp_weaklist 表示类型对象的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表在实例对象中的偏移量。 tp_del 和 tp_dealloc 作用相同，但 tp_del 主要是兼容以前的旧版本，现在直接使用 tp_dealloc 即可。 tp_version_tag 用于标记类型对象的版本，每当类型的定义发生变化时（例如添加、删除或修改成员函数），版本标签就会更新。解释器会使用这个版本标签来确定方法缓存是否有效，从而避免每次调用方法时都重新解析和查找。 tp_finalize 负责在对象被销毁之前执行相应的清理操作，确保资源得到妥善处理，它的调用时机在对象的引用计数达到零之后、tp_dealloc（析构函数）被调用之前。 该字段不常用，一般只出现在生成器和协程当中。然后 tp_dealloc、tp_del、tp_finalize 三个字段的类型是一致的，都是 destructor 类型，那么它们三者有什么区别呢？ tp_dealloc：在所有的类型对象中都需要指定，因为它是管理实例对象生命周期的关键，它负责减少引用的其它对象的引用计数，以及调用 tp_free 释放当前对象占用的内存，当然也可以执行必要的清理操作。 tp_finalize：负责在对象的生命周期结束前执行相关清理操作，一般只用于生成器和协程当中，此时会和 tp_dealloc 搭配使用。 tp_del：除非是兼容遗留代码，否则应避免使用 tp_del，而是依赖于更现代的垃圾回收和清理机制，即使用 tp_dealloc。 tp_vectorcall 前面说了，实例对象在调用时，可以走类型对象的 tp_call，但这样效率不高。为此 Python 引入了矢量调用，实现矢量调用的函数指针定义在实例对象内部，偏移量则由类型对象的 tp_vectorcall_offset 字段维护。 如果实例对象支持矢量调用，那么会通过类型对象的 tp_vectorcall_offset 定位到对应的 vectorcall 函数指针，进行调用。否则执行类型对象的 tp_call。 那么问题来了，既然实例对象可以支持矢量调用，那么类型对象当然也可以支持。而类型对象的矢量调用函数，便由 tp_vectorcall 字段指定。 所以 tp_vectorcall 和 tp_vectorcall_offset 之间的关系，就类似于 tp_dict 和 tp_dictoffset 之间的关系。 tp_dict 表示类型对象自身的属性字典，tp_dictoffset 表示实例对象的属性字典相对于实例对象首地址的偏移量。 tp_vectorcall 表示类型对象自身的矢量调用函数，tp_vectorcall_offset 表示实例对象的矢量调用函数相对于实例对象首地址的偏移量。 tp_weaklist 表示类型对象自身的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表相对于实例对象首地址的偏移量。 offset 机制允许实例对象拥有更加弹性的内存布局。 另外如果类型对象的 tp_vectorcall 字段为空，则表示类型对象不支持矢量调用，那么它在调用时会走元类的 tp_call。所以我们说 class 具有二象性，而这种平行的设计使得 Python 能够统一处理类型对象和实例对象的属性访问和调用行为。 以上就是 PyTypeObject 的各个字段的含义。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 解密 PyTypeObject","id":"18","title":"解密 PyTypeObject"},"180":{"body":"当存储键值对时，要将 key 映射成索引，这个索引就是哈希索引数组的索引。至于具体的映射过程由探测函数负责，即 PyDictKeysObject 结构体内部的 dk_lookup 字段。 Python 为哈希表搜索提供了多种探测函数： lookdict_unicode：专门针对 key 为字符串的 entry。 lookdict_index：专门针对 key 为整数的 entry。 lookdict：通用逻辑，可以把 lookdict_unicode、lookdict_index 看成 lookdict 的特殊实现，只不过 key 是整数和字符串的场景非常常见，因此为其单独实现了一个函数。 我们这里重点看一下 lookdict 的函数实现，不过在介绍之前，先来看几个宏。 // Objects/dictobject.c // 获取哈希表的长度，或者说哈希索引数组的长度\n#define DK_SIZE(dk) ((dk)->dk_size) // 哈希表的长度减 1，将 key 的哈希值和它按位与，便可将 key 映射成索引\n// 因为 dk_size 满足 2 的 n 次方，所以 hash % dk_size 等价于 hash & (dk_size - 1)\n#define DK_MASK(dk) (((dk)->dk_size)-1) // 获取哈希索引数组中每个元素的大小，数组的长度不同，每个元素的大小不同\n// dk_size <= 255，每个元素 1 字节\n// 256 <= dk_size <= 65535，每个元素 2 字节\n// 65536 <= dk_size <= 4294967295，每个元素 4 字节\n// dk_size >= 4294967296，每个元素 8 字节\n// 由于字典的键值对个数基本不会超过 4294967295，所以我们认为元素的大小就是 1、2 或者 4 字节\n#define DK_IXSIZE(dk) \\ (DK_SIZE(dk) <= 0xff ? \\ 1 : DK_SIZE(dk) <= 0xffff ? \\ 2 : DK_SIZE(dk) <= 0xffffffff ? \\ 4 : sizeof(int64_t)) // 获取紧跟在 PyDictKeysObject 结构体后面的键值对数组\n// 这个和前面介绍字符串时，获取 PyASCIIObject 结构体后面的字符数组是类似的\n// 主要是利用 C 语言指针的技巧（甚至都不能算技巧），这里再来详细介绍一下\n// 假设有一个 int *a，那么 a + 3 和 a[3] 是等价的，都会向后偏移 3 个 int，即 12 字节\n// 那么问题来了，对于任意类型的指针 T *p，如果想向后偏移 n 个字节，该怎么做呢？\n// 很简单，将 p 加上 n / sizeof(T) 即可，但问题是 n / sizeof(T) 不一定是个整数啊\n// 因此我们可以将指针转成 int8_t *，然后再加上 n，这样就会偏移 sizeof(int8_t) * n 个字节，即 n 个字节\n// 比如 ((int8_t *)p) + n 或者 ((int8_t *)p)[n]\n// 然后再来看 DK_ENTRIES 这个宏的逻辑，由于键值对数组紧跟在哈希索引数组后面\n// 所以通过 (dk)->dk_indices 获取哈希索引数组，然后转成 int8_t * 类型\n// 而 DK_SIZE(dk) * DK_IXSIZE(dk) 显然是哈希索引数组所占的内存大小\n// 然后让 (int8_t*)((dk)->dk_indices) 向后偏移这些字节，不就定位到键值对数组的首元素了吗\n#define DK_ENTRIES(dk) \\ ((PyDictKeyEntry*)(&((int8_t*)((dk)->dk_indices))[DK_SIZE(dk) * DK_IXSIZE(dk)])) // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 以上就是常用的几个宏，然后来看探测函数 lookdict 的逻辑。 // Objects/dictobject.c #define PERTURB_SHIFT 5 // 基于哈希索引数组的索引，获取指定的哈希槽里面存储的键值对数组的索引\nstatic inline Py_ssize_t\ndictkeys_get_index(PyDictKeysObject *keys, Py_ssize_t i)\n{ // 哈希表的长度 Py_ssize_t s = DK_SIZE(keys); // 键值对数组的索引 Py_ssize_t ix; // 如果哈希表的长度小于 1 << 8，哈希索引数组的每个元素占 1 字节 if (s <= 0xff) { int8_t *indices = (int8_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度小于 1 << 16，哈希索引数组的每个元素占 2 字节 // 指针类型要转成 int16_t *，这样获取元素时会获取两个字节 else if (s <= 0xffff) { int16_t *indices = (int16_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度大于等于 1 << 32，哈希索引数组的每个元素占 8 字节（no way）\n#if SIZEOF_VOID_P > 4 else if (s > 0xffffffff) { int64_t *indices = (int64_t*)(keys->dk_indices); ix = indices[i]; }\n#endif // 否则哈希索引数组的每个元素占 4 字节 else { int32_t *indices = (int32_t*)(keys->dk_indices); ix = indices[i]; } assert(ix >= DKIX_DUMMY); // 返回键值对数组的索引 return ix;\n} // 探测函数\nstatic Py_ssize_t _Py_HOT_FUNCTION\nlookdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr)\n{ // 将 key 映射成索引，这个索引就是哈希索引数组的索引 /* 参数 mp：指向字典的指针 * 参数 key：指向键的指针 * 参数 hash：键的哈希值 * 参数 value_addr：值的二级指针 */ size_t i, mask, perturb; PyDictKeysObject *dk; PyDictKeyEntry *ep0; top: // 指向 PyDictKeysObject 对象 dk = mp->ma_keys; // 获取 PyDictKeysObject 内部的 dk_entries，即键值对数组 ep0 = DK_ENTRIES(dk); // 哈希表的长度减 1 mask = DK_MASK(dk); // perturb，初始值等于参数 hash，即 key 的哈希值 perturb = hash; // 将哈希值和 mask 按位与，计算出哈希索引数组的索引 i = (size_t)hash & mask; for (;;) { // 基于哈希索引数组的索引，从指定的哈希槽中获取键值对数组的索引 Py_ssize_t ix = dictkeys_get_index(dk, i); // 哈希索引数组里面的元素初始为 -1，如果 ix == -1 // 证明当前 key 映射出的哈希槽，还没有存储键值对数组的某个索引 // 这就意味着当前要查找的 key 不存在，此时直接返回 -1 即可 if (ix == DKIX_EMPTY) { *value_addr = NULL; return ix; } // 如果 ix >= 0，说明确实存储了一个合法的键值对数组的索引 if (ix >= 0) { // ep0 是键值对数组，基于索引 ix 获取里面的键值对 PyDictKeyEntry *ep = &ep0[ix]; assert(ep->me_key != NULL); // ep->me_key 和变量 key 都是指针 // 如果这两者相等，说明指向了同一个对象（字符串），显然查找的 key 已在字典中 if (ep->me_key == key) { // 该函数不光要返回索引，还要返回 value，但 C 是单返回值语言，怎么办呢？ // 只需要在调用函数时传个指针过来即可，会在函数内部进行修改 // 由于 Python 的变量、容器存储的元素本身就是指针，所以 value_addr 是个二级指针 *value_addr = ep->me_value; // 返回键值对数组的索引 return ix; } // 如果 ep->me_key != key，说明两者指向的不是同一个对象 // 那么就比较两个对象本身以及哈希值是否相等，如果相等，也表示 key 已存在 if (ep->me_hash == hash) { // 先保证哈希值相等 PyObject *startkey = ep->me_key; Py_INCREF(startkey); // cmp 大于 0 说明比较结果为真，等于 0 说明比较结果为假，小于 0 说明比较时出现错误 int cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) { *value_addr = NULL; return DKIX_ERROR; } // 可能有人觉得这里的 if 是不是有点多余，这肯定百分百成立啊 // 其实这一步主要是为了检测字典是否被修改（不用关注） if (dk == mp->ma_keys && ep->me_key == startkey) { // 如果 cmp > 0，说明两个对象相等，那么修改 *value_addr，返回 ix if (cmp > 0) { *value_addr = ep->me_value; return ix; } } else { // 字典如果被修改，那么重头来，这里不用关注 goto top; } } } // 走到这里说明 ix 是合法的，但是对应的 entry->me_key 和当前要查找的 key 不相等 // 显然出现了索引冲突，于是将哈希值右移 5 位 perturb >>= PERTURB_SHIFT; // 然后加上 i*5 + 1，并重新和 mask 按位与，得到新的哈希索引数组的索引 // 也就是之前说的，改变规则、重新映射 i = (i*5 + perturb + 1) & mask; } Py_UNREACHABLE();\n} 以上就是 lookdict 函数的逻辑，至于 lookdict_index 和 lookdict_unicode 与之是类似的。 我们将逻辑再描述一遍，首先 perturb 初始等于 key 的哈希值，mask 等于哈希表的长度减一，然后执行 perturb & mask 便可得到一个索引。这个过程就是我们说的索引映射，映射出的索引便是哈希索引数组的索引，然后该索引对应的哈希槽又存储了一个索引，这个索引是键值对数组的索引。 哈希索引数组里面的一个位置我们称之为一个槽，如果映射出来的索引对应的哈希槽中存储的键值对数组的索引小于 0，说明该 key 对应的键值对还没有被存储过，那么直接返回初始值 -1 即可。 如果存储的键值对数组的索引（源码中的 ix）大于等于 0，说明已经存储了一个键值对，它的 key 和查找的 key 映射出的索引是相同的。然后比较 key 是否相等，如果相等，说明已经找到了，那么直接返回 ix 即可。如果 key 不相等，说明出现索引冲突了，那么要改变策略，重新映射。 perturb >>= PERTURB_SHIFT;\ni = mask & (i*5 + perturb + 1); 变量 i 便是映射出的哈希索引数组的索引，但发生冲突了，于是将 perturb 右移 5 位，然后加上 perturb + i * 5 + 1，再和 mask 按位与计算出新的 i。至于为什么要选择这种做法，这是 Python 官方经过多次实践得出来的结论。 当 lookdict 执行完之后，外界就拿到了指定的 key 对应的键值对数组的索引，并且也能拿到 key 对应的 value（key 若不存在就是 NULL）。但是还没结束，我们看到 lookdict 返回的是变量 ix，而变量 i 才是我们需要的。 变量 i 表示槽的索引，变量 ix 表示该槽存储的键值对数组的索引。由于我们是要寻找指定的槽，那么返回的应该是槽的位置、也就是变量 i 才对啊，为啥要返回变量 ix 呢？别急，往下看。 #define DKIX_EMPTY (-1) 初始状态下，槽存储的都是 -1，表示当前槽是可用的。如果存储的索引大于等于 0，则表示该槽已经被占用了，当 key 不相等时会改变规则重新映射。总之最终的结果是： 如果 key 存在，那么返回的 ix 就是该 key 对应的键值对在键值对数组中的索引，此时 ix 大于等于 0； 如果 key 不存在，那么返回的 ix 就是哈希槽的初始值 -1。 所以 lookdict 函数只是告诉我们当前 key 在哈希表中是否存在，如果要获取槽的索引，即 lookdict 里面的变量 i，那么还需要另外两个函数。 find_empty_slot：如果 lookdict 返回的 ix 小于 0，说明 key 不存在，那么调用该函数返回槽的索引。 lookdict_index：如果 lookdict 返回的 ix 大于等于 0，说明 key 存在，那么调用该函数返回槽的索引。 所以这两个函数做的事情是一样的，都是返回槽的索引，我们看一下具体实现。 // Objects/dictobject.c static Py_ssize_t\nfind_empty_slot(PyDictKeysObject *keys, Py_hash_t hash)\n{ assert(keys != NULL); const size_t mask = DK_MASK(keys); // 获取槽的索引 i size_t i = hash & mask; // 获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(keys, i); // 不停映射，直到 ix 小于 0 // 因为调用该函数时已经说明 key 不存在了 // 所以最终一定会映射到一个空槽 for (size_t perturb = hash; ix >= 0;) { perturb >>= PERTURB_SHIFT; // 映射的逻辑是相同的 i = (i*5 + perturb + 1) & mask; ix = dictkeys_get_index(keys, i); } // 当 ix 小于 0 时，便找到了槽的索引 return i;\n} static Py_ssize_t\nlookdict_index(PyDictKeysObject *k, Py_hash_t hash, Py_ssize_t index)\n{ size_t mask = DK_MASK(k); size_t perturb = (size_t)hash; size_t i = (size_t)hash & mask; for (;;) { // 基于槽的索引 i，获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(k, i); // 参数 index 就是 lookdict 函数返回的 ix // 如果 ix 和 index 是相等的，说明此时的 i 就是要获取的槽的索引 if (ix == index) { return i; } if (ix == DKIX_EMPTY) { return DKIX_EMPTY; } // 整个映射逻辑都是一样的 // 因为在 lookdict 函数中只返回了 ix，即参数 index // 所以要按照相同的规则再映射一次，如果映射出的 ix 和 index 相等 // 那么我们就找到了槽的索引 i，并且索引为 i 的槽存储的就是 index perturb >>= PERTURB_SHIFT; i = mask & (i*5 + perturb + 1); } Py_UNREACHABLE();\n} 所以我们说的探测函数应该是 lookdict 和 find_empty_slot、lookdict_index 的组合。 lookdict 负责返回槽存储的索引，用于判断 key 是否存在。 find_empty_slot、lookdict_index 则负责返回槽的索引，即 key 最终被映射到了哪一个槽。 另外还有一点，我们之前说索引冲突时，会执行探测函数计算新的存储位置。其实不管有没有发生冲突，即使存储键值对的时候哈希表是空的，也要执行探测函数，毕竟探测函数的目的就是基于哈希值映射出一个合适的槽。如果探测函数执行的时候发现索引冲突了，也就是槽里的索引 ix >= 0，并且 key 还不相等，那么会改变规则重新映射。 因此在存储某个键值对时，无论索引冲突多少次，探测函数只会执行一次。在探测函数里面，会不断尝试解决冲突，直到映射出一个可用的槽。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 探测函数","id":"180","title":"探测函数"},"181":{"body":"以上就是索引映射的具体逻辑，以及出现冲突是怎么解决的。就是先用哈希函数计算出 key 的哈希值，然后作为参数传递到探测函数中。在探测函数里面，会将哈希值和 mask 按位与，得到索引。如果索引冲突了，那么会改变规则，这里的规则如下： // 将哈希值右移 PERTURB_SHIFT 个位\nperturb >>= PERTURB_SHIFT;\n// 然后将哈希值加上 i*5 + 1，这个 i 就是当前冲突的索引\n// 运算之后的结果再和 mask 按位与，得到一个新的 i\n// 然后判断变量 i 对应的槽是否可用，不可用则重复当前逻辑，直到出现一个可用的槽\ni = (i*5 + perturb + 1) & mask; 所以 Python 在索引冲突时，并不像线性探测和平方探测那样，简单地加一个固定的偏移量，而是参考对象的哈希值计算出一个新的索引。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 小结","id":"181","title":"小结"},"182":{"body":"通过前面的学习，我们知道哈希表这种数据结构的逻辑是先通过哈希函数计算出键（key）的哈希值，然后将哈希值传递到探测函数中，映射成一个索引，最终通过索引去访问连续的内存区域。而哈希表这种数据结构，最终目的就是加速键的搜索过程。 但索引会存在冲突，并且键值对数量越多，映射出的索引出现冲突的概率越高。而如果冲突了，就改变规则重新映射，这种做法叫做开放寻址法。当发生冲突时，在探测函数内部会参考哈希值以及冲突的索引，计算下一个候选位置，并判断是否可用。如果不可用，会继续重复此过程，直到找到一个可用的位置。 通过多次探测，会经过多个位置，我们认为这些位置就形成了一个冲突探测链（探测序列），下面举例说明。 为了描述方便，我们后续偶尔会用 dk_indices 表示哈希索引数组、用 dk_entries 表示键值对数组、用 entry 表示键值对（包含两个字段：me_key 和 me_value，分别表示键和值）。当然在源码中，它们也是这个名字。 key 映射之后的索引是哈希索引数组的索引，我们记作 i，该索引对应的哈希槽中又存储了一个索引（entry 在键值对数组中的索引），我们记作 ix。那么 ix = dk_indices[i]，对应的 entry = dk_entries[ix]。 比如插入一个 key 等于 \"satori\" 的键值对，它映射到了索引为 a 的槽，但是该槽已经被占用了，那么 dk_entries[dk_indices[a]] 便是使用该槽的 entry，但它的 key 不等于 \"satori\"，说明出现了索引冲突。于是重新映射，映射到索引为 b 的槽，发现依旧不行。那么只能再次映射，映射到索引为 c 的槽，发现该槽存储的索引是 -1，说明该槽还没有人用，于是将键值对追加到 dk_entries 中，并把它在 dk_entries 中的索引存在该槽中。 那么经过以上流程，a -> b -> c 便形成了一条冲突探测链，同理我们查找的时候也会按照这个顺序进行查找。 显然上面这些东西，现在理解起来已经没什么难度了，我们基于 key 获取 value 时也是这个过程。 当执行 d[\"satori\"] 时，肯定会先映射到索引为 a 的槽，但 dk_entries[dk_indices[a]].me_key 不等于字符串 \"satori\"，于是重新映射。然后映射到索引为 b 的槽，发现还不相等，再映射到索引为 c 的槽，发现对应的键值对的 key 等于 \"satori\"，于是就把值取出来了。 显然以上符合我们的预期，但是，我要说但是了。如果我们把索引为 b 的槽对应的 entry 删掉呢？那么老规矩，映射成索引，先走到索引为 a 的槽，但是发现坑被占，于是又走到索引为 b 的槽，结果发现居然没有 entry，那么直接就报出了一个 KeyError。 所以继续寻找的前提是，哈希槽一定存储了某个 entry 在键值对数组中的索引，并且该 entry 的 key 和指定的 key 不相等。但如果发现没有 entry，直接 KeyError。 然而 \"satori\" 这个 key 确实是存在的，因此这种情况我们称之为探测链断裂。本来应该走到位置 c 的，但是由于位置 b 没有对应 entry，导致探测函数在位置 b 就停止了。 因此我们发现，当一个 entry 只要位于任何一条探测链当中，在删除时都不能执行真正意义上的删除，而是要进行伪删除。那什么是伪删除呢？别着急，先往下看。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表能直接删除元素吗","id":"182","title":"哈希表能直接删除元素吗"},"183":{"body":"哈希槽有以下几种状态： Unused； Active； Dummy； 来解释一下它们的含义。 // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 上面几个宏非常重要，当然主要是前两个宏。 Unused 态 如果没有 key 映射到指定的哈希槽，那么该哈希槽存储的索引就是 -1，即 DKIX_EMPTY，表示该槽尚未被使用，那么状态便是 Unused 态。比如一个刚初始化的哈希表，它的哈希索引数组存储的便都是 -1。 Active 态 如果某个 key 映射到了指定的哈希槽，那么该槽便会存储对应 entry 在键值对数组中的索引，这个索引一定是大于等于 0 的，此时该槽就从 Unused 态变成了 Active 态。 后续如果又有 key 映射到了该槽，那么看它和已存在的 entry 的 key，即 entry->me_key 是否相等。如果不相等，那么要改变规则重新映射；如果相等，那么便找到了指定的 entry，此时便可以更新或返回 entry->me_value。 Dummy 态 假设 key=\"abc\" 映射到了索引为 i 的哈希槽，该槽存储了对应的 entry 在键值对数组中的索引 ix，这时如果将 key=\"abc\" 的键值对给删掉，那么索引为 i 的哈希槽存储的值会变成多少呢？ 可能有人觉得，键值对都删掉了，那么哈希槽也不用再存储它的索引了，应该会重置为 -1 吧。答案是不对的，原因就是我们刚才说的，这么做会导致探测链断裂。 当 entry 被删掉之后，哈希槽存储的值会变成 -2，即 DKIX_DUMMY，表示该槽之前存储过某个 entry 在键值对数组中的索引，但是该 entry 被删除了。注：删除 entry 也不是直接将它从键值对数组中删掉，而是将它的 me_key 和 me_value 字段设置为 NULL。 图中的 dk_indices 中有一个槽存储的是 -2，但很明显之前它存储的应该是 1，只是后续 dk_entries 中索引为 1 的 entry 被删除了。而删除一个 entry，会将它的 me_key 和 me_value 设置为 NULL，并将哈希槽存储的索引设置为 -2，这便是上面提到的伪删除技术。 所以一个哈希槽有三种状态，我们记哈希槽存储的索引为 ix。 1）如果 ix == -1，说明该槽处于 Unused 态，还没有存储任何一个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，那么会 KeyError。 2）如果 ix >= 0，说明该槽处于 Active 态，已经保存了某个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要添加的 entry 的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么直接更新 value。 当基于 key 获取 value 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要搜索的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么返回 entry 的 value。 3）如果 ix == -2，说明该槽处于 Dummy 态，之前存储了某个 entry 在键值对数组中的索引，但之后该 entry 被删除了。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，发现处于 Dummy 态，会明白虽然当前的槽是无效的，但它不是探测链的终点，所以不会报错，而是会继续搜索，这样就保证了探测链的连续性。至于报错，是发现映射出的哈希槽处于 Unused 态，没有存储任何一个 entry 的索引，这就说明 key 对应的 entry 不存在，此时才会 KeyError。 以上就是哈希槽的三种状态，它们之间可以进行转换，但 Unused 态只能转换为 Active 态；Active 态只能转换为 Dummy 态；Dummy 态只能转换为 Active 态。 如果哈希槽存储的 ix == DKIX_EMPTY，那么它处于 Unused 态。如果后续存储了 entry 在键值对数组中的索引，那么 ix >= 0，此时哈希槽会从 Unused 态转换为 Active 态。如果哈希槽存储的索引对应的 entry 被删除，那么 ix 会变成 DKIX_DUMMY，此时哈希槽会从 Active 态转换为 Dummy 态。 那么问题来了，Dummy 态转换为 Active 态，你能猜到会在什么时候发生吗？ 很容易想到，假设新来了一个 entry，它正好撞上了 Dummy 态的哈希槽，那么该槽会从 Dummy 态转为 Active 态。 总结：假设新增一个 entry，它的 key 映射到了索引为 i 的槽，该槽存储的索引为 ix。 如果 ix == -1，说明一上来就有位置可用，那么直接将 entry 追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。也就是说，Python 默认不关心是否有 Dummy 态的哈希槽。 如果 ix >= 0，说明该槽已经有人用了，那么比较 dk_entries[ix].me_key 和要插入的 entry 的 key 是否相等，如果相等，那么更新键值对，不相等则重新映射。 如果 ix == -2，说明该槽之前被使用了，但使用它的 entry 后续又被删除了（伪删除，内存还在）。此时会复用该哈希槽，不过被伪删除的旧 entry 不会被复用，新增的 entry 依旧会追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。 还是这张图，但做了一些修改。图中索引为 5 的哈希槽存储的索引 ix 等于 4，但它经历了以下几个过程。 dk_indices[5] 初始为 -1，即 DKIX_EMPTY，此时处于 Unused 态。 来了一个 entry，映射到了索引为 5 的槽，发现该槽可用，于是将 dk_indices[5] 修改为 1（它在 dk_entries 中的索引），此时哈希槽变成 Active 态。 映射到索引为 5 的哈希槽的 entry 被删除，于是将 dk_indices[5] 修改为 DKIX_DUMMY，即 -2，并将 dk_entries[1] 的 me_key 和 me_value 设置为 NULL，此时哈希槽变成 Dummy 态。 后续又来了一个 entry，也映射到了索引为 5 的哈希槽，发现 dk_indices[5] 等于 -2，处于 Dummy 态。于是将新的 entry 追加到 dk_entries 中，并且在 dk_entries 中的索引为 4，然后再将 dk_indices[5] 修改为 4，此时哈希槽再次变成 Active 态。 那么问题来了，被删除的旧 entry 怎么办？显然会留在那里，它是无法被复用的，当它被删除的那一刻，就和哈希索引数组失去了联系，因为对应的哈希槽存储的值被修改成了 -2。即使后续有新的 entry 映射到了同一个槽，它也不知道该槽在存储 -2 之前存储了什么，所以只能选择追加。 而那些被删除的旧 entry 会在哈希表执行扩缩容的时候被处理，比如哈希表满了，会申请新的存储单元，然后将处于 Active 态的哈希槽对应的 entry 搬过去，其它的则直接丢弃。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希槽的几种状态","id":"183","title":"哈希槽的几种状态"},"184":{"body":"下面我们通过源码，来感受一下字典（哈希表）是如何删除元素的。字典有一个 pop 方法，可以基于 key 弹出指定的 entry，我们就来看一下它的源码实现。 // Objects/dictobject.c\n#define DICT_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))dict_pop, METH_FASTCALL, dict_pop__doc__}, static PyObject *\ndict_pop(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // pop 方法的返回值 PyObject *return_value = NULL; // 指定的 key PyObject *key; // pop 方法支持传入一个默认值 // 当 key 不存在时，如果不指定默认值，pop 方法会报错，否则会返回默认值 PyObject *default_value = NULL; // args 是由参数组成的元组，nargs 表示参数的个数 // 显然参数的个数必须是 1 ~ 2 个 if (!_PyArg_CheckPositional(\"pop\", nargs, 1, 2)) { goto exit; } // args[0] 表示 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示默认值，如果指定了的话 default_value = args[1];\nskip_optional: // 调用 dict_pop_impl 函数 // 从字典中弹出具有指定 key 的 entry，并返回它的 value return_value = _PyDict_Pop((PyObject*)self, key, default_value); exit: return return_value;\n} 具体的逻辑由 _PyDict_Pop 承载，看看它长什么样子？ // Objects/dictobject.c\nPyObject *\n_PyDict_Pop(PyObject *dict, PyObject *key, PyObject *deflt)\n{ Py_hash_t hash; // 快分支，如果键值对的个数为 0 if (((PyDictObject *)dict)->ma_used == 0) { // 那么当指定默认值时，直接返回默认值 if (deflt) { Py_INCREF(deflt); return deflt; } // 否则抛出 KeyError _PyErr_SetKeyError(key); return NULL; } // 计算 key 的哈希值，这里分两种情况 // key 不是字符串，那么调用 PyObject_Hash 函数进行计算 // key 是字符串，那么直接获取，如果获取的结果为 -1（之前没有计算过），也要重新计算 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { // 如果计算的结果是 -1，说明 key 无法被哈希 hash = PyObject_Hash(key); if (hash == -1) return NULL; } return _PyDict_Pop_KnownHash(dict, key, hash, deflt);\n} PyObject *\n_PyDict_Pop_KnownHash(PyObject *dict, PyObject *key, Py_hash_t hash, PyObject *deflt)\n{ Py_ssize_t ix, hashpos; PyObject *old_value, *old_key; PyDictKeyEntry *ep; PyDictObject *mp; assert(PyDict_Check(dict)); mp = (PyDictObject *)dict; // 如果字典为空，即键值对个数为 0 // 那么当指定默认值时，直接返回默认值，否则抛出 KeyError if (mp->ma_used == 0) { if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // mp->ma_keys->dk_lookup 表示探测函数，负责将 key 映射成索引，找到对应的哈希槽 // 然后返回哈希槽存储的 entry 在 dk_entries 中的索引 // 并且在探测函数里面，还会对 old_value 进行修改 ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); if (ix == DKIX_ERROR) return NULL; // 如果 ix == -1，说明映射之后的哈希槽处于 Unused 态 // 说明该 key 对应的 entry 不存在，或者说 key 不存在 if (ix == DKIX_EMPTY || old_value == NULL) { // 如果指定了默认值，返回默认值，否则抛出 KeyError if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // 到这里说明 ix >= 0，即 key 在字典中存在 // 然后检测字典是否是分离表，由于分离表不允许删除 key，所以要重构为结合表 // 分离表就是为了节省内存引入的，因此它的限制较多，这里不做过多讨论 if (_PyDict_HasSplitTable(mp)) { if (dictresize(mp, DK_SIZE(mp->ma_keys))) { return NULL; } ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); assert(ix >= 0); } // 这个函数之前也见过，它负责基于哈希槽存储的 entry 的索引，返回哈希槽的索引 hashpos = lookdict_index(mp->ma_keys, hash, ix); assert(hashpos >= 0); assert(old_value != NULL); // 字典的长度减 1 mp->ma_used--; // 更新字典的版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 将索引为 hashpos 的哈希槽的值设置为 DKIX_DUMMY // 即 dk_indices[hashpos] = DKIX_DUMMY // 注意：不能设置为 DKIX_EMPTY，因为要保护冲突探测链不断裂 dictkeys_set_index(mp->ma_keys, hashpos, DKIX_DUMMY); // 获取指定的 entry，即 dk_entries[ix] ep = &DK_ENTRIES(mp->ma_keys)[ix]; ENSURE_ALLOWS_DELETIONS(mp); // 将 me_key 和 me_value 设置为 NULL，伪删除 // 并减少它们指向的对象的引用计数 old_key = ep->me_key; ep->me_key = NULL; ep->me_value = NULL; Py_DECREF(old_key); ASSERT_CONSISTENT(mp); // 返回弹出的 value return old_value;\n} 整个过程和我们之前的分析一样，这里为了更好地理解，我们再举个实际的例子，将整个流程给串一下。 字典存储了三个键值对，显然它们会按照先来后到的顺序存储在 dk_entries 中。然后 \"a\": 1 映射到了索引为 4 的哈希槽，\"b\": 2 映射到了索引为 0 的哈希槽，\"c\": 3 映射到了索引为 6 的哈希槽。当然实际情况未必是这样，这里只是打个比方。 然后我们再添加一个键值对 mp[\"d\"] = 4，首先要将 \"d\" 映射成索引，假设映射出的索引为 0，由于 dk_indices[0] 的值为 1，而 dk_entries[1].me_key 不等于 \"d\"，所以出现冲突，于是哈希值右移 5 位，重新映射。 第二次映射出的索引为 6，由于 dk_indices[6] 的值为 2，而 dk_entries[2].me_key 也不等于 \"d\"，说明第二次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第三次映射出的索引为 4，由于 dk_indices[4] 的值为 0，而 dk_entries[0].me_key 也不等于 \"d\"，说明第三次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第四次映射出的索引为 2，而 dk_indices[2] 的值为 -1，说明该槽没有人用，于是将 entry 追加到键值对数组中，并将它在 dk_entries 中的索引赋值给 dk_indices[2]。还是那句话，实际情况并不一定是这样，这里只是为了方便解释而刻意举的例子。 所以对于 \"d\": 4 这个键值对来说，0 -> 6 -> 4 -> 2 就是它的冲突探测链，在查找的时候也会按照这个顺序进行查找。比如我们获取 mp[\"d\"]，那么会经历如下过程。 将 key=\"d\" 映射成索引，得到 0，但 dk_entries[dk_indices[0]].me_key 不等于 \"d\"，所以改变策略，重新映射。 第二次映射得到索引 6，但 dk_entries[dk_indices[6]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第三次映射得到索引 4，但 dk_entries[dk_indices[4]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第四次映射得到索引 2，发现 dk_entries[dk_indices[2]].me_key 等于 \"d\"，说明找到了指定的 entry，于是返回它的 value。 以上就是查找的整个过程，这时如果将 key=\"c\" 的 entry 删掉，比如执行 mp.pop(\"c\")，那么会发生什么呢？ 因为 \"c\" 映射到了索引为 6 的槽，当它被删除时，要将 dk_entries[dk_indices[6]] 的 me_key 和 me_value 都设置为 NULL，以及将 dk_indices[6] 设置为 DKIX_DUMMY。然后我们再获取 mp[\"d\"]，第二次映射会得到索引 6，发现该槽存储的值为 -2，就知道该槽并不是探测链的终点，于是会继续映射。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表删除元素源码解析","id":"184","title":"哈希表删除元素源码解析"},"185":{"body":"回顾一下字典的结构： 我们说 ma_used 字段表示字典的长度，它充当了 ob_size，而 dk_nentries 字段表示键值对数组中存储的键值对的个数，那么问题来了，这两个字段啥区别呢？从字面意思来看，这两者似乎是等价的。 相信这个问题对你来说没有任何难度，假设当前添加了 4 个键值对，那么 ma_used 和 dk_nentries 就都是 4。但如果再删除一个键值对，那么 ma_used 会变成 3，而 dk_nentries 还是 4。 所以 ma_used 会随着键值对的删除而减少，但 dk_nentries 保持不变，我们验证一下。 from ctypes import * class PyDictKeysObject(Structure): _fields_ = [(\"dk_refcnt\", c_ssize_t), (\"dk_size\", c_ssize_t), (\"dk_lookup\", c_void_p), (\"dk_usable\", c_ssize_t), (\"dk_nentries\", c_ssize_t), (\"dk_indices\", c_char * 8)] class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", POINTER(PyDictKeysObject)), (\"ma_values\", c_void_p)] d = {1: 1, 2: 2, 3: 3, 4: 4}\nobj = PyDictObject.from_address(id(d))\nprint(obj.ma_used) # 4\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 删除一个键值对\nd.pop(1)\nprint(obj.ma_used) # 3\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 再删除一个\nd.pop(2)\nprint(obj.ma_used) # 2\nprint(obj.ma_keys.contents.dk_nentries) # 4 结果和我们分析的一样，这就是 ma_used 和 dk_nentries 的区别。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » ma_used 和 dk_nentries 的区别","id":"185","title":"ma_used 和 dk_nentries 的区别"},"186":{"body":"以上我们就介绍了哈希表是怎么删除元素的，以及相关的具体细节，下一篇文章来说一说字典的创建，以及它的一些方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 小结","id":"186","title":"小结"},"187":{"body":"到目前为止，我们对字典应该已经有了非常细致的了解了，本篇文章来聊一聊字典的创建和相关操作，通过底层的源码实现，来进一步剖析字典。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 楔子","id":"187","title":"楔子"},"188":{"body":"字典在底层对应 PyDictObject 实例，它是怎么创建的呢？解释器提供了 PyDict_New 函数，会创建一个容量为 8 的字典。 // Objects/dictobject.c // 对于结合表，键值对均由 PyDictKeysObject 维护\n// 它一旦被创建，那么 dk_indices 的长度至少是 8\n// 至于 dk_indices 里面的元素初始为 -1，表示哈希槽尚未被使用\nstatic PyDictKeysObject empty_keys_struct = { 1, /* dk_refcnt */ 1, /* dk_size */ lookdict_split, /* dk_lookup */ 0, /* dk_usable (immutable) */ 0, /* dk_nentries */ {DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY}, /* dk_indices */\n}; #define Py_EMPTY_KEYS &empty_keys_struct\nstatic PyObject *empty_values[1] = { NULL }; PyObject *\nPyDict_New(void)\n{ dictkeys_incref(Py_EMPTY_KEYS); return new_dict(Py_EMPTY_KEYS, empty_values);\n} static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 字典也有缓存池，关于缓存池我们之后再说，这里先不管 if (numfree) { mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); _Py_NewReference((PyObject *)mp); } else { // 为字典申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); if (mp == NULL) { // 由于是先为 PyDictKeysObject 申请内存 // 所以当 PyDictObject 的内存申请失败时，还要处理 PyDictKeysObject dictkeys_decref(keys); if (values != empty_values) { free_values(values); } return NULL; } } // 字段初始化，而 keys 和 values 都是外界提前创建好，然后传过来的 mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 所以整个过程分为两步： 先创建 PyDictKeysObject 实例，底层默认提供了一个 Py_EMPTY_KEYS。 再创建 PyDictObject 实例，然后通过 ma_keys 字段使两者建立联系。 PyDictObject 实例的创建过程我们已经知道了，接下来是 PyDictKeysObject 实例的创建，只有它创建了，才能作为参数传递给 new_dict 函数。 // Objects/dictobject.c static PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // USABLE_FRACTION(size) 表示键值对数组的长度 // 它等于哈希索引数组长度的 2/3 usable = USABLE_FRACTION(size); // 基于哈希索引数组的长度，计算每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 不仅是 PyDictObject，PyDictKeysObject 同样也有自己的缓存池 // 关于它的缓存池，同样之后再聊，这里先不关心 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } // 为 PyDictKeysObject 申请内存，当然还包括两个数组 // 哈希索引数组的内存大小为 es * size // 键值对数组的大小为 sizeof(PyDictKeyEntry) * usable else { dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 字段初始化 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // memset 是一个 C 库函数：memset(p, val, size) // 作用是从指针 p 开始，将之后的 size 个字节的值全部初始化为 val // 显然这里是将哈希索引数组的元素都设置为 -1，注：(char)0xff == -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中每个 entry 的字段都设置为 0 // entry 的内存已经申请了，但还没有保存任何的键值对 // 所以将 me_hash、me_key、me_value 全部设置为 0 // 注：对于指针类型来说，赋值为 0 和 NULL 是等价的，因为 NULL 保存的地址就是 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 以上就是 PyDictKeysObject 实例的创建，当它创建完毕后，再作为参数传递给 new_dict 函数创建 PyDictObject 实例，整个过程还是比较简单的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典的创建","id":"188","title":"字典的创建"},"189":{"body":"首先类型对象定义了三个方法簇： tp_as_number：实例对象作为数值型对象拥有的方法； tp_as_sequence：实例对象作为序列型对象拥有的方法； tp_as_mapping：实例对象作为映射型对象拥有的方法； 当然啦，这三个方法簇对实例对象的类型要求并不严格，比如字符串作为序列型对象，也可以实现 tp_as_number，像字符串实现了里面的取模运算符，用于格式化。 那么字典呢，它的这几个方法簇都定义了哪些方法呢？ // Objects/dictobject.c static PySequenceMethods dict_as_sequence = { 0, /* sq_length */ 0, /* sq_concat */ 0, /* sq_repeat */ 0, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyDict_Contains, /* sq_contains */ 0, /* sq_inplace_concat */ 0, /* sq_inplace_repeat */\n}; static PyMappingMethods dict_as_mapping = { (lenfunc)dict_length, /*mp_length*/ (binaryfunc)dict_subscript, /*mp_subscript*/ (objobjargproc)dict_ass_sub, /*mp_ass_subscript*/\n}; 以上就是字典的几个方法簇，我们从 Python 的角度来演示一下。 d = {\"a\": 1, \"b\": 2, \"c\": 3, \"d\": 4} # dict_as_sequence.sq_contains：判断 key 是否存在\nprint(\"a\" in d) # True # dict_as_mapping.dict_length：返回字典长度\nprint(len(d)) # 4 # dict_as_mapping.dict_subscript：基于 key 获取 value\nprint(d[\"a\"]) # 1 # dict_as_mapping.dict_ass_sub：设置 key、value\nd[\"高老师\"] = \"美男子\"\nprint(d[\"高老师\"]) # 美男子 接下来我们就从源码的角度，来看看这些方法是怎么实现的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典都有哪些方法？","id":"189","title":"字典都有哪些方法？"},"19":{"body":"下面来介绍一些常见的类型在底层的定义。 Python 底层的 C API 和对象的命名都遵循统一的标准，比如类型对象均以 Py***_Type 的形式命名，当然啦，它们都是 PyTypeObject 结构体实例。所以我们发现，Python 里的类在底层是以全局变量的形式静态定义好的。 所以实例对象可以有很多个，但对应的类型对象则是唯一的，在底层直接以全局变量的形式静态定义好了。比如列表的类型是 list，列表可以有很多个，但 list 类型对象则全局唯一。 data1 = [1, 2, 3]\ndata2 = [4, 5, 6]\nprint( data1.__class__ is data2.__class__ is list\n) # True 如果站在 C 的角度来理解的话： data1 和 data2 变量均指向了列表，列表在底层对应 PyListObject 结构体实例，里面字段的含义之前说过。但需要注意的是，指针数组里面保存的是对象的指针，而不是对象。不过为了方便，图中就用对象代替了。 然后列表的类型是 list，在底层对应 PyList_Type，它是 PyTypeObject 结构体实例，保存了列表的元信息（比如内存分配信息、支持的相关操作等）。 而将这两者关联起来的便是 ob_type，它位于 PyObject 中，是所有对象都具有的。因为变量只是一个 PyObject * 指针，那么解释器要如何得知变量指向的对象的类型呢？答案便是通过 ob_type 字段。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 一些常见的类型对象","id":"19","title":"一些常见的类型对象"},"190":{"body":"设置键值对，比如 d[\"a\"] = 1，那么会调用 dict_as_mapping 的 mp_ass_subscript，看一下它的具体逻辑。 // Objects/dictobject.c static int\ndict_ass_sub(PyDictObject *mp, PyObject *v, PyObject *w)\n{ // 参数 mp 指向字典，参数 v 指向 key，参数 w 指向 value // 虽然是设置键值对，但如果 w == NULL，那么也可以实现删除的效果 if (w == NULL) return PyDict_DelItem((PyObject *)mp, v); else return PyDict_SetItem((PyObject *)mp, v, w);\n} int\nPyDict_SetItem(PyObject *op, PyObject *key, PyObject *value)\n{ PyDictObject *mp; Py_hash_t hash; if (!PyDict_Check(op)) { PyErr_BadInternalCall(); return -1; } assert(key); assert(value); mp = (PyDictObject *)op; // 如果 key 不是字符串，或者 key 是字符串、但哈希值等于 -1（尚未计算） // 那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 如果是一个空字典，那么调用 insert_to_emptydict if (mp->ma_keys == Py_EMPTY_KEYS) { return insert_to_emptydict(mp, key, hash, value); } // 不是空字典，那么调用 insertdict return insertdict(mp, key, hash, value);\n} 所以最终会调用 insert_to_emptydict 或 insertdict，这里我们直接看 insertdict 函数的具体实现。 // Objects/dictobject.c static int\ninsertdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject *value)\n{ PyObject *old_value; PyDictKeyEntry *ep; Py_INCREF(key); Py_INCREF(value); // 字典有两种结构，分别是分离表和结合表 // 如果是分离表，那么 key 必须全部是字符串，因为它是为对象的属性字典引入的，而属性肯定是字符串 // 所以当字典使用的是分离表，并且插入的 key 不是字符串时，那么要重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) goto Fail; } // 探测函数，将 key 的哈希值映射成索引，该索引是哈希槽的索引 // 然后返回该哈希槽存储的键值对数组的索引，同时修改 old_value Py_ssize_t ix = mp->ma_keys->dk_lookup(mp, key, hash, &old_value); if (ix == DKIX_ERROR) goto Fail; assert(PyUnicode_CheckExact(key) || mp->ma_keys->dk_lookup == lookdict); MAINTAIN_TRACKING(mp, key, value); // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && old_value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) goto Fail; ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 在字典中不存在 if (ix == DKIX_EMPTY) { assert(old_value == NULL); // 如果键值对数组的长度小于等于 0，说明还没有为键值对数组分配内存 // 那么依旧调用 insertion_resize，该函数后续解释 if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) goto Fail; } // 按照相同的规则对 key 的哈希值进行映射，并返回哈希槽的索引 // 如果没有撞上 Dummy 态的哈希槽，那么 dk_indices[hashpos] 会等于 ix // 如果在映射的过程中，撞上了 Dummy 态的哈希槽，那么直接将该槽的索引返回 // 但不管是哪一种情况，我们都找到了一个合法的槽 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // dk_entries[dk_nentries] 便对应新的 entry，由于内存一开始便分配好了 // 因此所谓添加，其实就是修改它的 me_key 和 me_value 字段 // 将这两个字段的值，修改为参数 key 和参数 value ep = &DK_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries]; // 新的 entry 会添加在键值对数组中索引为 mp->ma_keys->dk_nentries 的位置 // 因为键值对始终是按照先来后到的顺序追加的，然后调用 dictkeys_set_index // 将 entry 在键值对数组中的索引，赋值给 mp->ma_keys->dk_indices[hashpos] dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); // 更新 me_key 和 me_value ep->me_key = key; ep->me_hash = hash; // 如果 mp->ma_values 不为空，证明字典使用的是分离表 if (mp->ma_values) { // 分离表的话，value 统一由 mp->ma_values 维护 // 至于 entry 里面的 me_value 字段则始终为 NULL assert (mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 否则说明字典使用的是结合表，将 entry->me_value 的值设置为 value else { ep->me_value = value; } mp->ma_used++; // 字典长度加 1 mp->ma_version_tag = DICT_NEXT_VERSION(); // 更新字典的版本号 mp->ma_keys->dk_usable--; // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_nentries++; // 键值对已存储的 entry 个数加 1 assert(mp->ma_keys->dk_usable >= 0); ASSERT_CONSISTENT(mp); return 0; } // 如果程序走到这里，说明 ix >= 0，即 key 已存在 // 那么当 old_value != value 时，要对值进行更新 if (old_value != value) { // 分离表，更新 mp->ma_values->values[ix] if (_PyDict_HasSplitTable(mp)) { mp->ma_values[ix] = value; if (old_value == NULL) { /* pending state */ assert(ix == mp->ma_used); mp->ma_used++; } } else { // 结合表，获取 entry，更新它的 me_value 字段 assert(old_value != NULL); DK_ENTRIES(mp->ma_keys)[ix].me_value = value; } mp->ma_version_tag = DICT_NEXT_VERSION(); } Py_XDECREF(old_value); /* which **CAN** re-enter (see issue #22653) */ ASSERT_CONSISTENT(mp); Py_DECREF(key); return 0; Fail: Py_DECREF(value); Py_DECREF(key); return -1;\n} 以上就是获取键值对，源码细节和我们之前分析哈希表时说的是一样的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 设置键值对","id":"190","title":"设置键值对"},"191":{"body":"如果是获取 value，比如 v = d[\"a\"]，那么会调用 dict_as_mapping 的 mp_subscript，看一下它的具体逻辑。 // Objects/dictobject.c\nstatic PyObject *\ndict_subscript(PyDictObject *mp, PyObject *key)\n{ Py_ssize_t ix; Py_hash_t hash; PyObject *value; // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1，那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 探测函数，将 key 映射成索引，并返回对应的哈希槽存储的键值对数组的索引 // 并且在函数内部，还会对参数 value 进行修改，所以这里要传递二级指针 // 如果键值对存在，那么参数 value 就是对应的值，否则 value 会等于 NULL ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 当 ix == -1 或 value == NULL 时，说明 key 对应的键值对不存在 if (ix == DKIX_EMPTY || value == NULL) { if (!PyDict_CheckExact(mp)) { // 但如果 mp 不是字典，即 type(mp) is not dict // 那么说明 mp 的类型一定继承了 dict PyObject *missing, *res; _Py_IDENTIFIER(__missing__); // 检测 mp 是否定义了 __missing__ 方法，如果定义了则调用 // 所以该方法要定义在继承了 dict 的子类中 missing = _PyObject_LookupSpecial((PyObject *)mp, &PyId___missing__); if (missing != NULL) { res = PyObject_CallFunctionObjArgs(missing, key, NULL); Py_DECREF(missing); return res; } else if (PyErr_Occurred()) return NULL; } // 到这里说明 key 不存在，并且也没有定义 __missing__，那么 KeyError _PyErr_SetKeyError(key); return NULL; } // 否则说明键值对存在，那么增加引用计数，返回 value Py_INCREF(value); return value;\n} 所以获取 value 的话，也比较简单，关键在于里面有一个 __missing__ 方法，我们来解释一下。 class Dict(dict): def __getitem__(self, item): return super().__getitem__(item) def __missing__(self, key): return f\"不存在的 key：{key}\" d = Dict({\"a\": 1, \"b\": 2})\n# 会执行 Dict.__getitem__(d, \"a\")\n# 在内部会调用字典的 __getitem__\nprint(d[\"a\"]) # 1\nprint(d[\"b\"]) # 2 # 而在调用字典的 __getitem__ 时，如果发现 key 不存在\n# 那么会尝试寻找 __missing__ 方法\nprint(d[\"c\"]) # 不存在的 key：c\nprint(d[\"高老师\"]) # 不存在的 key：高老师 以上就是获取键值对。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 基于 key 获取 value","id":"191","title":"基于 key 获取 value"},"192":{"body":"关于字典是怎么创建的，以及它添加键值对、基于键获取值的源码细节，我们就分析完了。当然还没有结束，字典还有很多的自定义方法，我们下一篇文章来剖析这些自定义方法的实现细节。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 小结","id":"192","title":"小结"},"193":{"body":"上一篇文章我们介绍了字典的创建过程，和一些基本操作，这些操作都对应一个魔法方法。但除了这些魔法方法之外，每个对象还可以单独定义很多自己的方法，这些方法统一由类型对象的 tp_methods 字段维护，当然这些之前已经说过了。 里面有很多的自定义方法，比如 get、pop、setdefault 等等，我们来剖析一下。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 楔子","id":"193","title":"楔子"},"194":{"body":"获取指定 key 对应的 value，如果 key 不存在，那么返回默认值。 d = {\"name\": \"古明地觉\"}\nprint(d.get(\"name\"))\n\"\"\"\n古明地觉\n\"\"\"\n# key 不存在，返回默认值 None\nprint(d.get(\"desc\"))\n\"\"\"\nNone\n\"\"\"\n# 当然也可以指定默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\" 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_GET_METHODDEF \\ {\"get\", (PyCFunction)(void(*)(void))dict_get, METH_FASTCALL, dict_get__doc__}, static PyObject *\ndict_get(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; // 返回值 PyObject *key; // 指定的 key PyObject *default_value = Py_None; // 默认值，默认为 None // get 方法接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"get\", nargs, 1, 2)) { goto exit; } // args[0] 便是指定的 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 便是传入的默认值，如果有的话 default_value = args[1];\nskip_optional: // 调用 dict_get_impl return_value = dict_get_impl(self, key, default_value); exit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_get_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val = NULL; Py_hash_t hash; // 哈希值 Py_ssize_t ix; // 哈希槽存储的键值对数组的索引 // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 获取 key 对应的哈希槽存储的键值对数组的索引 ix = (self->ma_keys->dk_lookup) (self, key, hash, &val); if (ix == DKIX_ERROR) return NULL; // key 不存在，那么将默认值赋值给 val if (ix == DKIX_EMPTY || val == NULL) { val = default_value; } // 增加 val 的引用计数，然后返回 Py_INCREF(val); return val;\n} 以上就是字典的 get 方法，非常简单。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 get 方法","id":"194","title":"字典的 get 方法"},"195":{"body":"这是一个非常强大的方法，但是用的人不是很多。它和 get 方法类似，都是传入一个 key 和一个默认值，如果 key 存在，那么返回 key 对应的 value，否则返回默认值。但它和 get 方法不同的是，setdefault 在 key 不存在时，会将 key 和默认值添加到字典中。 d = {\"name\": \"古明地觉\"}\n# 当 key 存在时，两个方法的效果是一样的，都等价于 d[key]\nprint(d.get(\"name\"))\nprint(d.setdefault(\"name\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 但当 key 不存在时，就有差别了\n# \"desc\" 这个 key 不存在，返回默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 并且原始的字典不受影响\nprint(d)\n\"\"\"\n{'name': '古明地觉'}\n\"\"\" # 但对于 setdefault 来说，key 不存在时\n# 会将 key 和默认值添加进去，然后返回默认值\nprint(d.setdefault(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 原始的字典会发生改变\nprint(d)\n\"\"\"\n{'name': '古明地觉', 'desc': '地灵殿美少女'}\n\"\"\" 所以当获取的 key 不存在时，v = d.setdefault(key, value) 等价于如下。 d[key] = value v = d[key] 那么 setdefault 一般用在什么地方呢？举个例子。 data = [ (\"古明地觉\", \"2020\", 5), (\"古明地觉\", \"2020\", 2), (\"古明地觉\", \"2021\", 1), (\"古明地觉\", \"2021\", 4), (\"古明地觉\", \"2021\", 3), (\"芙兰朵露\", \"2022\", 7), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2023\", 4), (\"芙兰朵露\", \"2023\", 1)\n]\n# 对于上面这种数据，我们需要变成下面这个样子\n\"\"\"\n{ '古明地觉': { '2020': [5, 2], '2021': [1, 4, 3] }, '芙兰朵露': { '2022': [7, 3, 3], '2023': [4, 1] }\n}\n\"\"\"\n# 如果使用 setdefault 方法，就非常好解决了\nd = {}\nfor name, year, cnt in data: d.setdefault(name, {}).setdefault(year, []).append(cnt)\nprint(d) 下面来看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_SETDEFAULT_METHODDEF \\ {\"setdefault\", (PyCFunction)(void(*)(void))dict_setdefault, METH_FASTCALL, dict_setdefault__doc__}, static PyObject *\ndict_setdefault(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 这部分和 get 方法是类似的 PyObject *return_value = NULL; PyObject *key; PyObject *default_value = Py_None; if (!_PyArg_CheckPositional(\"setdefault\", nargs, 1, 2)) { goto exit; } key = args[0]; if (nargs < 2) { goto skip_optional; } default_value = args[1];\nskip_optional: return_value = dict_setdefault_impl(self, key, default_value);\nexit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_setdefault_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val; val = PyDict_SetDefault((PyObject *)self, key, default_value); Py_XINCREF(val); return val;\n} 所以核心在于 PyDict_SetDefault 函数，这个函数比较长，但逻辑不难理解。 // Objects/dictobject.c\nPyObject *\nPyDict_SetDefault(PyObject *d, PyObject *key, PyObject *defaultobj)\n{ PyDictObject *mp = (PyDictObject *)d; PyObject *value; Py_hash_t hash; if (!PyDict_Check(d)) { PyErr_BadInternalCall(); return NULL; } // 获取哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 如果 mp->ma_keys 等于 Py_EMPTY_KEYS，证明字典是空的，那么 key 肯定不存在 // 将 key 和 defaultobj 添加进字典中，并返回 defaultobj if (mp->ma_keys == Py_EMPTY_KEYS) { if (insert_to_emptydict(mp, key, hash, defaultobj) < 0) { return NULL; } return defaultobj; } // 如果字典使用的是分离表，并且 key 不是字符串 // 意味着字典的结构要发生改变，重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) return NULL; } // 获取哈希槽存储的键值对数组的索引 Py_ssize_t ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) { return NULL; } ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 不存在，那么要先添加键值对 if (ix == DKIX_EMPTY) { PyDictKeyEntry *ep, *ep0; value = defaultobj; // 是否还有可用空间，如果没有，调用 insertion_resize if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) { return NULL; } } // 返回 key 映射之后的哈希槽的索引 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // 新添加的 entry 在键值对数组中的索引为 mp->ma_keys->dk_nentries // 将该索引赋值给 dk_indices[hashpose] ep0 = DK_ENTRIES(mp->ma_keys); ep = &ep0[mp->ma_keys->dk_nentries]; dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); Py_INCREF(key); Py_INCREF(value); MAINTAIN_TRACKING(mp, key, value); ep->me_key = key; ep->me_hash = hash; // 如果字典是分离表 if (_PyDict_HasSplitTable(mp)) { // 值由 mp->ma_values 存储 assert(mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 如果字典是结合表，那么键和值均保存在 entry 中 else { ep->me_value = value; } // 字典长度加 1 mp->ma_used++; // 修改版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_usable--; // 键值对数组已经容纳的 entry 个数加 1 mp->ma_keys->dk_nentries++; assert(mp->ma_keys->dk_usable >= 0); } // ... ASSERT_CONSISTENT(mp); // 返回 value return value;\n} 以上便是 setdefault 方法。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 setdefault 方法","id":"195","title":"字典的 setdefault 方法"},"196":{"body":"字典的 pop 方法之前已经说过了，这里来看一下 popitem 方法。 d = {\"x\": 1, \"y\": 2, \"z\": 3}\n# pop 方法可以弹出指定的 key，并返回对应的 value\n# 如果 key 不存在，并且没有指定默认值，会抛出 KeyError，否则返回默认值\nprint(d.pop(\"x\")) # 1 # 而 popitem 方法则是弹出字典的最后一个键值对\nd = {\"x\": 1, \"y\": 2, \"z\": 3}\nprint(d.popitem()) # ('z', 3)\nprint(d) # {'x': 1, 'y': 2} 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_POPITEM_METHODDEF \\ {\"popitem\", (PyCFunction)dict_popitem, METH_NOARGS, dict_popitem__doc__}, static PyObject *\ndict_popitem(PyDictObject *self, PyObject *Py_UNUSED(ignored))\n{ return dict_popitem_impl(self);\n} // Objects/dictobject.c\nstatic PyObject *\ndict_popitem_impl(PyDictObject *self)\n{ Py_ssize_t i, j; PyDictKeyEntry *ep0, *ep; PyObject *res; // 返回值，一个二元组，负责存储 key 和 value res = PyTuple_New(2); if (res == NULL) return NULL; // 如果字典的长度为 0，那么抛出 KeyError if (self->ma_used == 0) { Py_DECREF(res); PyErr_SetString(PyExc_KeyError, \"popitem(): dictionary is empty\"); return NULL; } // 如果字典使用分离表，那么当 popitem 之后，要重构为结合表 // 分离表要求 key 必须全部是字符串，并且不能删除键值对 if (self->ma_keys->dk_lookup == lookdict_split) { if (dictresize(self, DK_SIZE(self->ma_keys))) { Py_DECREF(res); return NULL; } } ENSURE_ALLOWS_DELETIONS(self); // 获取键值对数组 ep0 = DK_ENTRIES(self->ma_keys); // ma_keys->dk_nentries 表示键值对数组中已使用的 entry 个数 // 那么 entry 的最大索引就是 ma_keys->dk_nentries - 1 i = self->ma_keys->dk_nentries - 1; // 从 i 开始往前遍历，找到第一个 me_value != NULL 的 entry // 因为被删除的 entry 依旧会驻留在键值对数组中，但 me_key、me_value 被设置为 NULL while (i >= 0 && ep0[i].me_value == NULL) { i--; } assert(i >= 0); // 获取 entry ep = &ep0[i]; // 基于哈希槽存储的索引，获取哈希槽的索引 j = lookdict_index(self->ma_keys, ep->me_hash, i); assert(j >= 0); assert(dictkeys_get_index(self->ma_keys, j) == i); // 因为 entry 被删除了，所以对应的哈希槽存储的值要修改为 DKIX_DUMMY dictkeys_set_index(self->ma_keys, j, DKIX_DUMMY); // 将 key 和 value 保存在元组中 PyTuple_SET_ITEM(res, 0, ep->me_key); PyTuple_SET_ITEM(res, 1, ep->me_value); // 因为被弹出了，所以 entry 的 me_key 和 me_value 要重置为 NULL ep->me_key = NULL; ep->me_value = NULL; // 这一步一会儿解释 self->ma_keys->dk_nentries = i; // 键值对个数减 1 self->ma_used--; self->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(self); return res;\n} 以上就是 popitem 方法，但是里面有一行 self->ma_keys->dk_nentries = i 估计让人有些费解，我们解释一下。 首先当键值对数组的空间申请之后，entry 就已经存在了，初始状态下的 entry 的 me_key 和 me_value 均为 NULL。所以一个被伪删除的 entry 和初始的 entry 是等价的，下面假设有这么一个键值对数组。 对于一个容量为 16 的哈希表，它的键值对数组的长度为 10，由于 dk_nentries = 7，说明键值对数组使用了 7 个 entry。而在之后，第 2 个 entry 和第 7 个 entry 被删除了，一旦删除，那么它的 me_key 和 me_value 会被重置为 NULL，和初始 entry 是等价的。 这时候如果执行 popitem，那么会弹出最后一个 me_value 不为 NULL 的 entry，即没有被伪删除的 entry，对于当前来说就是第 6 个 entry。所以源码中的 i 初始等于 dk_nentries - 1，然后往前遍历，最终会找到索引为 5 的 entry，所以循环之后 i = 5。然后将索引为 5 的 entry 的 me_key 和 me_value 设置为 NULL，因为它被删除了。 注意：这里关键来了，既然变量 i 保存的是最后一个 me_value != NULL 的 entry 的索引，那么当它被删除之后，就意味着从索引 i 开始，后面所有的 entry 都相当于回归到了初始状态，那么直接将 dk_nentries 设置为 i。 由于 dk_nentries 被设置为 i，后续再添加键值对时，就会添加到索引为 i 的位置。对于当前来说，添加键值对时，修改的是 dk_entries[5] 的 me_key 和 me_value，而不是 dk_entries[7] 的 me_key 和 me_value。 所以通过 popitem 方法，被删除的 entry 是有可能实现复用的。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 popitem 方法","id":"196","title":"字典的 popitem 方法"},"197":{"body":"以上我们就简单分析了字典的几个自定义方法，下一篇文章来聊一聊字典的扩容。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 小结","id":"197","title":"小结"},"198":{"body":"在介绍字典的底层结构时我们看到，当已使用的 entry 数量达到总容量的 2/3 时，会发生扩容。 而在早期，哈希表只使用一个键值对数组，这个键值对数组不仅要存储具体的 entry，还要承载哈希索引数组的功能。本来这个方式很简单，但是内存浪费严重，于是后面 Python 官方就将一个数组拆成两个数组来实现。 不是说只能用 2/3 吗？那就只给键值对数组申请 2/3 容量的空间，并且只负责存储键值对。至于索引，则由哈希索引数组来承载。通过将 key 映射成索引，找到指定的哈希槽，再根据槽里面存储的索引，找到键值对数组中存储的 entry。 因此减少内存开销的核心就在于，避免键值对数组的浪费。 所以哈希索引数组的长度就可以看成是哈希表的容量，而键值对数组的长度本身就是哈希索引数组长度的 2/3、或者说容量的 2/3。那么很明显，当键值对数组满了，就说明当前的哈希表要扩容了。 // Objects/dictobject.c\n#define GROWTH_RATE(d) ((d)->ma_used*3) 扩容之后的新哈希表的容量要大于等于 ma_used * 3，注意是大于等于 ma_used * 3，不是 dk_nentries * 3。因为 dk_nentries 还包含了被删除的 entry，但哈希表在扩容的候会将其丢弃，所以扩容之后新哈希表的容量取决于 ma_used。 当然啦，哈希表的容量还要等于 2 的幂次方，所以有两个条件： 大于等于 ma_used * 3； 等于 2 的幂次方； 基于以上两个限制条件，取到的最小值便是扩容之后的容量。而扩容的具体过程我们稍后会介绍，目前先来回顾一下基础知识。 以上是字典的底层结构，假设变量 mp 指向了 PyDictObject 实例，那么可以得到如下信息。 mp->ma_keys->dk_indices 便是哈希索引数组，它的长度便是哈希表的容量。 mp->ma_keys->dk_entries 便是键值对数组，里面的一个 entry 就是一个键值对。 如果字典使用的是结合表，那么 entry 的 me_key、me_value 字段负责存储键和值，此时 mp->ma_values 为 NULL。 如果字典使用的是分离表，那么 entry 的 me_key 字段负责存储键，me_value 字段则始终为 NULL，此时由 mp->ma_values 负责存储值，这种做法可以让多个字典共享一组 key，从而节省内存。 因为分离表是 Python 针对实例对象的属性字典单独设计的，我们平时创建的都是结合表，所以一开始并没有讨论分离表。但分离表其实非常简单，这里来补充一下吧。现在假设有一个字典，里面有三个键值对 \"a\": 1, \"b\": 2, \"c\": 3，我们看一下分别使用结合表和分离表存储时，字典的结构是什么样子。 所以结合表是键和值存在一起，分离表是键和值分开存储，非常好理解。我们自己创建的字典，使用的都是结合表，分离表是为了减少对象属性字典的内存使用而专门引入的。因此对于一个分离表而言，它的 key 一定都是字符串，否则不可能是分离表。而如果 key 都是字符串，那么既可以是分离表，也可以是结合表。 接着是转换关系：分离表可以重构为结合表，但反过来不行。 好，下面我们来看一下扩容逻辑，它由 dictresize 函数负责。 // Objects/dictobject.c #define PyDict_MINSIZE 8 static int\ndictresize(PyDictObject *mp, Py_ssize_t minsize)\n{ // 参数 minsize 表示字典的 ma_used * 3，即长度 * 3 Py_ssize_t newsize, numentries; // mp->ma_keys PyDictKeysObject *oldkeys; // mp->ma_values PyObject **oldvalues; // mp->ma_values->dk_entries PyDictKeyEntry *oldentries, *newentries; /* Find the smallest table size > minused. */ // 初始容量为 8，如果 newsize < minsize，那么不断循环 // 直到条件不满足时，便找到了大于等于 minsize 的最小 2 的幂次方数 // newsize 便是字典扩容之后的新容量 for (newsize = PyDict_MINSIZE; newsize < minsize && newsize > 0; newsize <<= 1) ; if (newsize <= 0) { PyErr_NoMemory(); return -1; } // 获取扩容之前的 ma_keys oldkeys = mp->ma_keys; // 在介绍字典的创建时，我们说过这个函数，它负责为 PyDictKeysObject 实例申请内存 mp->ma_keys = new_keys_object(newsize); if (mp->ma_keys == NULL) { mp->ma_keys = oldkeys; return -1; } assert(mp->ma_keys->dk_usable >= mp->ma_used); // 设置探测函数 if (oldkeys->dk_lookup == lookdict) mp->ma_keys->dk_lookup = lookdict; // 字典的长度 numentries = mp->ma_used; // 扩容之前的键值对数组 oldentries = DK_ENTRIES(oldkeys); // 扩容之后的键值对数组 newentries = DK_ENTRIES(mp->ma_keys); // 扩容之前的 ma_values oldvalues = mp->ma_values; // 如果 oldvalues 不为 NULL，说明字典使用的是分离表 // 那么当字典发生扩容时，要转成结合表 if (oldvalues != NULL) { // 将旧的键值对数组的 entry 拷贝到新的键值对数组中 for (Py_ssize_t i = 0; i < numentries; i++) { assert(oldvalues[i] != NULL); PyDictKeyEntry *ep = &oldentries[i]; PyObject *key = ep->me_key; Py_INCREF(key); // key 始终存储在 entry 中 newentries[i].me_key = key; // 设置哈希值 newentries[i].me_hash = ep->me_hash; // 将 mp->ma_values 里面的值，赋值给 entry->me_value newentries[i].me_value = oldvalues[i]; } // 旧的 ma_keys 和 ma_values 要释放掉 dictkeys_decref(oldkeys); mp->ma_values = NULL; if (oldvalues != empty_values) { free_values(oldvalues); } } // 说明字典使用的是结合表，重构的结果依旧是结合表 else { // combined table. // 如果 entry 的数量等于字典的长度，说明没有被删除的 entry，那么直接 memcpy 过去即可 if (oldkeys->dk_nentries == numentries) { memcpy(newentries, oldentries, numentries * sizeof(PyDictKeyEntry)); } // 否则遍历 oldentries，将 me_value != NULL 的 entry 拷贝过去 else { PyDictKeyEntry *ep = oldentries; for (Py_ssize_t i = 0; i < numentries; i++) { while (ep->me_value == NULL) ep++; newentries[i] = *ep++; } } assert(oldkeys->dk_lookup != lookdict_split); assert(oldkeys->dk_refcnt == 1); // 缓存池逻辑，后续聊 if (oldkeys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { _Py_DEC_REFTOTAL; keys_free_list[numfreekeys++] = oldkeys; } else { _Py_DEC_REFTOTAL; PyObject_FREE(oldkeys); } } // 到此键值对数组的元素就拷贝完了，然后还要进行索引映射，并存储在哈希槽中 build_indices(mp->ma_keys, newentries, numentries); // dk_usable 表示还可以容纳多少个键值对 // dk_nentries 表示已经容纳了多少个键值对 // 而 numentries 表示字典的长度，所以重构之后 // dk_usable 的大小要减去 numentries，dk_nentries 直接等于 numentries mp->ma_keys->dk_usable -= numentries; mp->ma_keys->dk_nentries = numentries; return 0;\n} 因为要对哈希表的种类分情况讨论，所以导致代码有点长，但逻辑不难理解： 首先确定哈希表的容量，它要满足 2 的幂次方，并且大于等于 ma_used * 3。 为 ma_keys 重新申请内存。 根据哈希表的种类分情况讨论，但核心都是将旧的没有被删除的 entry 搬过去。 释放 ma_keys，如果字典之前是分离表，还要释放 ma_values。 以上就是哈希表的扩容，或者说字典的扩容，我们就介绍到这儿，下一篇文章来介绍字典的缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"46. 字典是怎么扩容的？它会经历哪些过程？","id":"198","title":"46. 字典是怎么扩容的？它会经历哪些过程？"},"199":{"body":"本篇文章来聊一聊字典的缓存池，我们知道字典有一个 ma_keys 字段和一个 ma_values 字段。当哈希表为分离表时，键由 ma_keys 维护，值由 ma_values 维护；当哈希表为结合表时，键和值均由 ma_keys 维护。 那么当我们销毁一个 PyDictObject 时，也肯定要先释放 ma_keys 和 ma_values。 如果是分离表，会将每个 value 的引用计数减 1，然后释放 ma_values；再将每个 key 的引用计数减 1，然后释放 ma_keys。最后再释放 PyDictObject 本身。 如果是结合表，由于 key、value 都在 ma_keys 中，将每个 key、value 的引用计数减 1 之后，只需释放 ma_keys 即可。最后再释放 PyDictObject 本身。 整个过程还是很清晰的，只不过这里面遗漏了点什么东西，没错，就是缓存池。在介绍浮点数的时候，我们说不同的对象都有自己的缓存池，当然字典也不例外。并且除了 PyDictObject 之外，PyDictKeysObject 也有相应的缓存池，毕竟它负责存储具体的键值对。 那么下面我们就来研究一下这两者的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 楔子","id":"199","title":"楔子"},"2":{"body":"我们上面说了， Python 解释器 = Python 编译器 + Python 虚拟机 ，当解释器执行 py 文件时都经历了哪些过程呢？ Read File、Scanner、Parser、Compiler 都是由 Python 编译器负责的，Code Eval 则由 Python 虚拟机负责。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。 而 Python 编译器和 Python 虚拟机组合起来，便是 Python 解释器。 如果你了解 Java，那么应该知道 Java 也有编译器和虚拟机。只不过 Java 的编译器和虚拟机是分开的，而 Python 则是整合在一起的。 不过在后续介绍 Python 源码的时候，我们暂不涉及 Python 编译器的部分，也就是 Parser 目录里面的代码不做分析，因为涉及到编译原理。而且编译这一过程也不是 Python 语言独有的，任何一门编程语言、当然还有 SQL 都会涉及到编译。所以探究 Python 代码的编译过程没太大意义，我们的重点是 Python 代码的编译结果，以及虚拟机是如何执行的？","breadcrumbs":"1. CPython 源码长什么样子？ » 解释器、编译器、虚拟机","id":"2","title":"解释器、编译器、虚拟机"},"20":{"body":"不同类型的实例对象，在底层由不同的结构体实现，比如整数对应 PyLongObject 实例、浮点数对应 PyFloatObject 实例、列表对应 PyListObject 实例等等。 但所有的类型对象，在底层由同一个结构体实现，它们都是 PyTypeObject 实例。而 PyTypeObject 结构体在实例化时，内部字段接收的值不同，那么生成的类型对象也不同，可以是 PyLong_Type、PyFloat_Type、PyList_Type 等等。并且每个类型对象都是唯一的，比如在程序中可以创建很多个列表（PyListObject 实例），但类型对象 <class 'list'>（PyList_Type）只会存在一个。 因为类型对象都是静态定义在源码中的，并以全局变量的形式存在。而将实例对象和类型对象关联起来的，则是实例对象的 ob_type 字段，在 Python 里面可以通过调用 type 或者获取 __class__ 属性查看。 关于类型对象的更多内容，后续会继续介绍。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 小结","id":"20","title":"小结"},"200":{"body":"字典的缓存池和列表的缓存池高度相似，都是采用数组实现的，并且容量也是 80 个。 // Objects/dictobject.c\n#define PyDict_MAXFREELIST 80 static PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0; 下面看一下字典的销毁过程，因为放入缓存池这个动作，一定是在对象销毁时发生的。 // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 将 dk_refcnt 减 1 // 如果字典是结合表，那么 dk->dk_refcnt 减 1 之后一定为 0 // 如果字典是分离表，那么 dk->dk_refcnt 减 1 之后则不一定为 0 if (--dk->dk_refcnt == 0) { // 释放 ma_keys，该函数稍后再聊 free_keys_object(dk); }\n} static void\ndict_dealloc(PyDictObject *mp)\n{ PyObject **values = mp->ma_values; PyDictKeysObject *keys = mp->ma_keys; Py_ssize_t i, n; // 因为要被销毁，所以让 GC 不再跟踪 PyObject_GC_UnTrack(mp); // 用于延迟释放 Py_TRASHCAN_BEGIN(mp, dict_dealloc) // 如果 values 不为 NULL，说明是分离表 if (values != NULL) { if (values != empty_values) { // 将每个 value 的引用计数减 1 for (i = 0, n = mp->ma_keys->dk_nentries; i < n; i++) { Py_XDECREF(values[i]); } // 释放 ma_values free_values(values); } // 将 ma_keys->dk_refcnt 减 1，至于是否会释放 ma_keys // 则看是否还有其它组的 value 使用它 dictkeys_decref(keys); } // 否则说明是结合表 else if (keys != NULL) { // 结合表的话，dk_refcnt 一定等于 1，因为每组 value 都独占一组 key assert(keys->dk_refcnt == 1); // dk_refcnt 减 1 之后等于 0，内部会调用 free_keys_object // 在里面会先将每个 key、value 的引用计数减 1，然后再释放 ma_keys dictkeys_decref(keys); } // 如果 numfree 没达到 80，那么放入缓存池 if (numfree < PyDict_MAXFREELIST && Py_TYPE(mp) == &PyDict_Type) // PyDictObject 缓存池是一个数组，直接添加在数组的尾部即可，然后 numfree 自增 1 free_list[numfree++] = mp; else // 否则将空间交还给系统堆 Py_TYPE(mp)->tp_free((PyObject *)mp); Py_TRASHCAN_END\n} 同理，当创建字典时，也会优先从缓存池里面获取。 // Objects/dictobject.c static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 如果 numfree != 0，证明缓存池有可用元素 if (numfree) { // 从缓存池当中获取 mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); // 将引用计数设置为 1 _Py_NewReference((PyObject *)mp); } else { // 否则从堆区申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); // ... } // 初始化字段，然后返回 (PyObject *)mp mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 因此在缓存池的实现上，字典和列表有着很高的相似性。不仅都由数组实现，在销毁的时候也会放在数组的尾部，创建的时候也会从数组的尾部获取。当然啦，因为这么做符合数组的特性，如果销毁和创建都是在数组的头部操作，那么时间复杂度就从 O(1) 变成了 O(n)。 我们用 Python 来测试一下： d1 = {k: 1 for k in \"abcdef\"}\nd2 = {k: 1 for k in \"abcdef\"}\nprint(\"id(d1):\", id(d1))\nprint(\"id(d2):\", id(d2))\n# 放到缓存池的尾部\ndel d1\ndel d2\n# 缓存池：[d1, d2] # 从缓存池的尾部获取\n# 显然 id(d3) 和上面的 id(d2) 是相等的\nd3 = {k: 1 for k in \"abcdefghijk\"}\n# id(d4) 和上面的 id(d1) 是相等的\nd4 = {k: 1 for k in \"abcdefghijk\"}\nprint(\"id(d3):\", id(d3))\nprint(\"id(d4):\", id(d4))\n\"\"\"\nid(d1): 140079181793600\nid(d2): 140079181775488\nid(d3): 140079181775488\nid(d4): 140079181793600\n\"\"\" 输出结果和我们的预期是相符合的，以上就是 PyDictObject 的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictObject 缓存池","id":"200","title":"PyDictObject 缓存池"},"201":{"body":"PyDictKeysObject 也有自己的缓存池，同样基于数组实现，大小是 80。 // Objects/dictobject.c #define PyDict_MAXFREELIST 80\n// PyDictObject 缓存池以及容量\nstatic PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0;\n// PyDictKeysObject 缓存池以及容量\nstatic PyDictKeysObject *keys_free_list[PyDict_MAXFREELIST];\nstatic int numfreekeys = 0; 来看一下 PyDictKeysObject 的销毁过程： // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 分离表：多组 value 可以共享一组 key // 结合表：每组 value 独占一组 key // 因此要先将 dk_refcnt 减 1，如果结果为 0，那么才能释放 ma_keys if (--dk->dk_refcnt == 0) { free_keys_object(dk); }\n} static void\nfree_keys_object(PyDictKeysObject *keys)\n{ // 获取键值对数组 PyDictKeyEntry *entries = DK_ENTRIES(keys); Py_ssize_t i, n; // 遍历 dk_entries，减少 key、value 的引用计数 for (i = 0, n = keys->dk_nentries; i < n; i++) { Py_XDECREF(entries[i].me_key); // 如果是分离表，那么 me_value == NULL // 而当参数为 NULL 时，Py_XDECREF 不做任何处理 Py_XDECREF(entries[i].me_value); } // 放入缓存池，除了要保证缓存池没满之外，还要保证 dk_size = 8 // 也就是说，只有容量为 8 的哈希表的 PyDictKeysObject 才会被缓存 if (keys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { keys_free_list[numfreekeys++] = keys; return; } // 如果条件不满足，释放 ma_keys，将内存交还给系统堆 PyObject_FREE(keys);\n} 所以 PyDictKeysObject 的缓存池和列表的缓存池同样是高度相似的，只不过它想要被缓存，除了保证缓存池有剩余空间之外，还要满足哈希表的容量等于 8，这个限制是出于对内存方面的考量。 以上是 ma_keys 的销毁过程，再来看看它的创建过程。 // Objects/dictobject.c // 为 PyDictKeysObject 实例申请内存\nstatic PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // 获取键值对数组的长度 usable = USABLE_FRACTION(size); // 计算哈希索引数组中每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 如果容量等于 8，并且缓存池有可用元素，那么从缓存池中获取 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } else { // 否则在堆区申请内存，而内存包含三部分 // sizeof(PyDictKeysObject)：结构体 PyDictKeysObject 的大小 // es * size：哈希索引数组的大小 // sizeof(PyDictKeyEntry) * usable)：键值对数组的大小 dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 初始化字段 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // 将哈希索引数组中的每个元素都设置成 -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中的每个元素（entry）的所有字段都设置成 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 非常简单，我们来验证一下。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d1 = {k: 1 for k in \"komeiji satori\"}\nprint( \"d1.ma_keys:\", PyDictObject.from_address(id(d1)).ma_keys\n)\n# 键值对个数超过了 8，哈希表的容量必然也超过了 8\n# 那么当销毁 d1 的时候，d1.ma_keys 不会被缓存，而是会直接释放掉\ndel d1 d2 = {k: 1 for k in \"abc\"}\nprint( \"d2.ma_keys:\", PyDictObject.from_address(id(d2)).ma_keys\n)\n# 容量等于 8，所以 d2.ma_keys 会被缓存\ndel d2 d3 = {k: 1 for k in \"komeiji koishi\"}\nprint( \"d3.ma_keys:\", PyDictObject.from_address(id(d3)).ma_keys\n)\n# 尽管 d2 的 ma_keys 被缓存起来了，但是 d3 的 dk_size 大于 8\n# 因此它不会从缓存池中获取，而是重新创建 d4 = {k: 1 for k in \"abc\"}\nprint( \"d4.ma_keys:\", PyDictObject.from_address(id(d4)).ma_keys\n)\n# d4 的 dk_size 等于 8，因此它会从缓存池中获取，从而复用被销毁的 d2.ma_keys\n# 最终打印结果如下\n\"\"\"\nd1.ma_keys: 94324986272656\nd2.ma_keys: 140165216613312\nd3.ma_keys: 140165225069456\nd4.ma_keys: 140165216613312\n\"\"\" 从打印的结果来看，由于 d4.ma_keys 和 d2.ma_keys 是相同的，因此证实了我们的结论。不像列表和字典，它们是只要被销毁，就会放到缓存池里面，因为它们没有存储具体的数据，大小是固定的。但 PyDictKeysObject 不同，由于它存储了 entry，每个 entry 占 24 字节，如果内部的 entry 非常多，那么缓存起来会有额外的内存开销。因此 Python 的策略是，只有在哈希表容量等于 8 的时候，才会缓存。当然这三者在缓存池的实现上，是基本一致的。 不难看出，Python 在性能和内存使用方面都做了考量。但如果你追求更高的效率，那么也可以自己定制 Python 解释器，比如增大缓存池的容量等等，用更多的空间去换取时间。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictKeysObject 缓存池","id":"201","title":"PyDictKeysObject 缓存池"},"202":{"body":"到此，字典相关的内容就全部介绍完了。和元组一样，字典也在我们看不到的地方被大量使用，比如对象的属性字典、名字空间等等。正因为解释器内部也在大量使用字典，所以字典是一个被高度优化的数据结构，不仅要保证搜索效率，还要减少内存使用。 下一篇文章，我们来介绍 Python 的集合。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 小结","id":"202","title":"小结"},"203":{"body":"本篇文章来聊一聊 Python 的集合是怎么实现的？前面我们介绍了字典的实现原理，它底层是基于哈希表实现的，而集合也是如此。 事实上，集合就类似于没有 value 的字典。","breadcrumbs":"48. 解密集合的实现原理 » 楔子","id":"203","title":"楔子"},"204":{"body":"那么集合都有哪些用处呢？ 1）去重 chars = [\"a\", \"b\", \"a\", \"c\", \"c\"] print( list(set(chars))\n) # ['b', 'a', 'c'] 比如你需要监听一个队列，处理接收到的消息，但每一条消息都有一个编号，要保证具有相同编号的消息只能被处理一次，要怎么做呢？ 显然集合此时就派上用场了，我们可以创建一个集合，每来一条消息，就检测它的编号是否在集合中。如果存在，则说明消息已经被处理过了，忽略掉；如果不存在，说明消息还没有被处理，那么就将它的编号添加到集合中，然后处理消息。 2）判断某个序列是否包含指定的多个元素 data = [\"S\", \"A\", \"T\", \"O\", \"R\", \"I\"] # 现在要判断 data 是否包含 \"T\"、\"R\" 和 \"I\"\n# 如果使用列表的话\nprint( \"T\" in data and \"R\" in data and \"I\" in data\n) # True # 显然使用列表比较麻烦，并且效率也不高，于是我们可以使用集合\nprint( set(data) >= {\"T\", \"R\", \"I\"}\n) # True 同理，基于此方式，我们也可以检测一个字典是否包含指定的多个 key。 data = { \"name\": \"satori\", \"age\": 17, \"gender\": \"female\"\n} # 判断字典是否包含 name、age、gender 三个 key\nprint( data.keys() >= {\"name\", \"age\", \"gender\"}\n) # True # 字典的 keys 方法会返回一个 dict_keys 对象\n# 该对象具备集合的性质，可以直接和集合进行运算 显然对于这种需求，有了集合就方便多了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的使用场景","id":"204","title":"集合的使用场景"},"205":{"body":"然后我们来罗列一下集合支持的 API，在使用集合的时候要做到心中有数。 # 如果是创建一个空集合，那么要使用 set()\n# 写成 {} 的话，解释器会认为这是一个空字典\ns = {1, 2, 3} # 添加元素，时间复杂度是 O(1)\ns.add(4)\nprint(s) # {1, 2, 3, 4} # 删除指定的元素，如果元素不存在，会抛出 KeyError\n# 时间复杂度为 O(1)\ns.remove(2)\nprint(s) # {1, 3, 4} # 删除指定的元素，如果元素不存在则什么也不做\n# 时间复杂度为 O(1)\ns.discard(666)\nprint(s) # {1, 3, 4} # 随机弹出一个元素并返回，如果集合为空，会抛出 KeyError\n# 时间复杂度为 O(1)\nprint(s.pop()) # 1\nprint(s) # {3, 4} # 清空一个集合\ns.clear()\nprint(s) # set() # 还有一些 API，但我们更推荐使用操作符的方式\n# 两个集合取交集\nprint({1, 2} & {2, 3}) # {2} # 两个集合取并集\nprint({1, 2} | {2, 3}) # {1, 2, 3} # 两个集合取差集\n# s1 - s2，返回在 s1、但不在 s2 当中的元素\nprint({1, 2, 3} - {2, 3, 4}) # {1} # 两个集合取对称差集\n# s1 ^ s2，返回既不在 s1、也不在 s2 当中的元素\nprint({1, 2, 3} ^ {2, 3, 4}) # {1, 4} # 判断两个集合是否相等，也就是内部的元素是否完全一致\n# 顺序无所谓，只比较元素是否全部相同\nprint({1, 2, 3} == {3, 2, 1}) # True\nprint({1, 2, 3} == {1, 2, 4}) # False # 判断一个集合是否包含另一个集合的所有元素\n# 假设有两个集合 s1 和 s2：\n# 如果 s1 的元素都在 s2 中，那么 s2 >= s1；\n# 如果 s2 的元素都在 s1 中，那么 s1 >= s2；\n# 如果 s1 和元素和 s2 全部相同，那么 s1 == s2；\nprint({1, 2, 3} > {1, 2}) # True\nprint({1, 2, 3} >= {1, 2, 3}) # True 以上就是集合支持的一些 API，还是很简单的。","breadcrumbs":"48. 解密集合的实现原理 » 集合的 API","id":"205","title":"集合的 API"},"206":{"body":"集合和字典的内部都使用了哈希表，但字典的哈希表采用两个数组实现，而集合的哈希表采用一个数组实现。因此对于集合来说，这个数组不仅要存储 entry，并且映射出的索引也是该数组的索引。 下面看一下集合的底层结构长什么样子。 // Include/setobject.h typedef struct { // 定长对象的头部信息，但集合显然是一个变长对象 // 所以和字典一样，肯定有其它字段充当 ob_size PyObject_HEAD // Active 态的 entry 数量加上 Dummy 态的 entry 数量 // 一个 entry 就是哈希表里的一个元素，类型为 setentry // 因此在集合里面，一个 entry 就是一个 setentry 结构体实例 // 当删除集合的 entry 时，也必须是伪删除，因为要保证探测链不断裂 // 如果 entry 被伪删除了，那么它便处于 Dummy 态 Py_ssize_t fill; // Active 态的 entry 数量，显然这个 used 充当了 ob_size，也就是集合的元素个数 Py_ssize_t used; // 在看字典源码的时候，我们也见到了 mask，它用于和哈希值进行按位与、计算索引 // 并且这个 mask 等于哈希表的容量减 1，为什么呢？ // 假设哈希值等于 v，哈希表容量是 n，那么通过 v 对 n 取模即可得到一个位于 0 到 n-1 之间的数 // 然而取模运算的效率不高，应该使用 v&(n-1)，它的作用等价于 v%n，并且速度更快 // 但是注意，只有在 n 为 2 的幂次方的时候，v&(n-1) 和 v%n 才是完全等价的 // 所以哈希表的容量要求是 2 的幂次方，就是为了将取模运算优化成按位与运算 Py_ssize_t mask; // 指向 setentry 数组首元素的指针 // 这个 setentry 数组可以是下面的 smalltable，也可以是单独申请的一块内存 setentry *table; // 集合的哈希值，只适用于不可变集合 Py_hash_t hash; // 用于 pop 方法 Py_ssize_t finger; // 一个 setentry 类型的数组，集合的元素就存在里面，但记得我们前面说过 // 变长对象的内部不会存储具体的元素，而是会存储一个指针，该指针指向的内存区域才是用来存储具体元素的 // 这样当扩容的时候，只需要让指针指向新的内存区域即可，从而方便维护 // 没错，对于集合而言，只有在容量不超过 8 的时候，元素才会存在里面 // 而一旦超过了 8，那么会使用 malloc 单独申请内存 setentry smalltable[PySet_MINSIZE]; // 弱引用列表，不做深入讨论 PyObject *weakreflist;\n} PySetObject; 有了字典的经验，再看集合会简单很多。然后是 setentry，用于承载集合内的元素，那么它的结构长什么样呢？相信你能够猜到。 // Include/setobject.h typedef struct { PyObject *key; Py_hash_t hash;\n} setentry; 相比字典少了一个 value，这是显而易见的。 因此集合的结构很清晰了，假设有一个集合 {3.14, \"abc\", 666}，那么它的结构如下： 由于集合里面只有三个元素，所以它们都会存在 smalltable 数组里面，我们通过 ctypes 来证明这一点。 from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {3.14, \"abc\", 666}\n# 先来打印一下哈希值\nprint('hash(3.14) =', hash(3.14))\nprint('hash(\"abc\") =', hash(\"abc\"))\nprint('hash(666) =', hash(666))\n\"\"\"\nhash(3.14) = 322818021289917443\nhash(\"abc\") = 2548892134347232650\nhash(666) = 666\n\"\"\" # 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 0\n2 666\n3 322818021289917443\n4 0\n5 0\n6 2548892134347232650\n7 0\n\"\"\" 根据输出的哈希值我们可以断定，这三个元素确实存在了 smalltable 数组里面，并且 666 存在了数组索引为 2 的位置、3.14 存在了数组索引为 3 的位置、\"abc\" 存在了数组索引为 6 的位置。 当然，由于哈希值是随机的，所以每次执行之后打印的结果都可能不一样，但是整数除外，它的哈希值就是它本身。既然哈希值不一样，那么每次映射出的索引也可能不同，但总之这三个元素是存在 smalltable 数组里面的。 然后我们再考察一下其它字段： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\n# 集合里面有 3 个元素，所以 fill 和 used 都是 3\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 3 # 将集合元素全部删除\n# 这里不能用 s.clear()，原因一会儿说\nfor _ in range(len(s)): s.pop() # 我们知道哈希表在删除元素的时候是伪删除\n# 所以 fill 不变，但是 used 每次会减 1\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 0 fill 字段维护的是 Active 态的 entry 数量加上 Dummy 态的 entry 数量，所以删除元素时它的大小是不变的。但 used 字段的值每次会减 1，因为它维护的是 Active 态的 entry 的数量。所以在不涉及元素的删除时，这两者的大小是相等的。 另外我们说上面不能用 s.clear()，因为该方法表示清空集合，此时会重置为初始状态，然后 fill 和 used 都会是 0，这样就观察不到想要的现象了。 删除集合所有元素之后，我们再往里面添加元素，看看是什么效果： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\nfor _ in range(len(s)): s.pop() # 添加一个元素\ns.add(0)\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 1 多次执行的话，会发现打印的结果可能是 3、1，也有可能是 4、1。至于原因，有了字典的经验，相信你肯定能猜到。 首先添加元素之后，used 肯定为 1。至于 fill，如果添加元素的时候，正好撞上了一个 Dummy 态的 entry，那么将其替换掉，此时 fill 不变，仍然是 3。但如果没有撞上 Dummy 态的 entry，而是添加在了新的位置，那么 fill 就是 4。 for i in range(1, 10): s.add(i)\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 10\ns.pop()\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 9 在之前代码的基础上，继续添加 9 个元素，然后 used 变成了 10，这很好理解，因为此时集合有 10 个元素。但 fill 也是 10，这是为什么？很简单，因为哈希表扩容了，扩容时会删除 Dummy 态的 entry，所以 fill 和 used 是相等的。同理，如果再继续 pop，那么 fill 和 used 就又变得不相等了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的底层结构","id":"206","title":"集合的底层结构"},"207":{"body":"集合的结构我们已经清楚了，再来看看它的初始化过程。我们调用类 set，传入一个可迭代对象，便可创建一个集合，这个过程是怎样的呢？ // Objects/setobject.c\nPyObject *\nPySet_New(PyObject *iterable)\n{ return make_new_set(&PySet_Type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为 PySetObject 申请内存，初始容量为 8 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 对字段做初始化 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; // 哈希表容量为 8 时，元素会存在 smalltable 里面 // 因此直接将 smalltable 赋值给 table so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 遍历 iterable，将迭代出的元素添加到集合中 // 关于这个函数，我们之后再介绍 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} 可以看到，集合的创建过程非常简单。","breadcrumbs":"48. 解密集合的实现原理 » 集合的创建","id":"207","title":"集合的创建"},"208":{"body":"字典和集合都是采用哈希表实现的，但字典的哈希表使用了两个数组，而集合的哈希表使用了一个数组，我们对比一下两者的差异。 假设有一个字典和一个集合，字典包含三个键值对，分别是 \"a\": 1、\"b\": 2、\"c\": 3，集合包含三个元素，分别是 \"a\"、\"b\"、\"c\"，然后映射出的索引分别是 2、5、3。 注：为了方便，这里的图画得没有那么严谨。比如集合的哈希表，里面的元素直接用字符串代替了，但其实它存储的是 setentry entry，而 entry 的 key 字段指向的才是字符串。当然这里我们心里清楚就好。 在介绍字典的时候我们说过，早期的字典内部的哈希表也是使用一个数组实现，除了 entry 会多存储一个 value 之外，其它和当前的集合是类似的。 但如果只使用一个数组实现，会导致内存浪费严重，因为哈希表必须要保证一定的稀疏性。所以后续字典内部的哈希表采用两个数组实现，将存储键值对的数组的长度压缩到原来的 2/3，至于映射出的索引则由另一个数组（哈希索引数组）来承载。虽然引入新的数组会带来额外的内存开销（假设大小为 m 字节），但存储键值对的数组不用再浪费 1/3 的空间（假设大小为 n 字节），只要 m 小于 n，那么使用两个数组就会更加节省内存。而在介绍字典的时候我们也看到了，m 是远小于 n 的。 那么问题来了，为什么集合不使用两个数组呢？很简单，因为使用一个数组实现哈希表会更简单，虽然也更加浪费内存。而集合和字典在哈希表的实现上之所以区别对待，还是使用频率的问题，解释器内部极度依赖字典，比如全局变量就是使用字典存储的。 可以说字典的效率高度影响着整个解释器的效率，字典的内存大小高度影响着解释器的内存占用。因此 Python 除了优化字典的搜索性能之外，还要尽可能地减少字典的内存大小。所以字典搞出了分离表、结合表，这一切操作都是为了将字典的内存占用降到最低。 至于集合，解释器对它的依赖就很小了，所以内部的哈希表，只采用了一个数组实现。虽然会有内存浪费，但无伤大雅。 好，回到上面的例子，如果将字典的键值对 \"b\": 2 和集合的元素 \"b\" 删掉，那么它们的结构会发生什么变化呢？ \"b\" 映射出的索引为 5，因此对于字典来说，会将索引为 5 的哈希槽存储的值设置为 dummy。然后是键值对数组，会将指定的 entry 的 me_key 和 me_value 字段全部设置为 NULL，相当于回归到了初始状态。 需要注意的是，数组一旦申请，那么 entry 的空间就已经有了，只是 me_key 和 me_value 字段均为 NULL。而所谓添加键值对，本质上也是修改指定 entry 的 me_key 和 me_value 字段。 对于集合来说，它只有一个数组，这个数组不仅要存储键值对，它的索引还表示 key 映射出的索引，当然这里的 key 指的就是集合的元素。\"b\" 映射出的索引为 5，所以将数组中索引为 5 的 entry->key 设置为 dummy。 但要注意的是，字典的 dummy 是一个整数，值为 -2（DKIX_DUMMY），因为哈希索引数组存储的是键值对数组的索引，显然这是一个整数。然后 key 映射出的索引是哈希索引数组的索引，如果对应的哈希槽存储的值是 -2，说明当前搜索的 key 对应的 entry 被删除了，应该继续向后搜索。 而集合的 dummy 是一个结构体指针，定义如下： // Objects/setobject.c\nstatic PyObject _dummy_struct;\n#define dummy (&_dummy_struct) 因为集合内部的哈希表只使用了一个数组，该数组存储的是 setentry。如果在查找的时候，发现对应的 entry 的 key 等于 dummy，就知道该 entry 被删除了，应该继续向后搜索。 好，继续回到上面的例子，假设这时候再给字典添加一个键值对 \"d\": 4，给集合添加一个元素 \"d\"，而字符串 \"d\" 映射出的索引也是 5，那么结构是怎样的呢？ 对于字典来说，键值对始终按照先来后到的顺序添加在键值对数组中，然后将它在键值对数组中的索引保存在指定的哈希槽中。由于索引为 5 的哈希槽保存的是 -2，处于 Dummy 态，因此直接将它设置为 3。 同理对于集合来说也是类似的。数组索引为 5 的位置保存的值等于 dummy，处于 Dummy 态，说明该元素被删除了，那么直接替换掉。因此整个过程的逻辑很简单：由于索引会存在冲突，所以元素删除之后，需要写入一个特殊的墓碑值，也就是这里的 dummy，因为要保证探测链不断裂。但如果集合后续添加元素时，正好撞上了一个 Dummy 态的 entry，那么会直接替换掉。 所以不论是字典还是集合，只要处于 Dummy 态，都可以替换掉。因为 Dummy 态存在的目的就是为了保证探测链不断裂，而替换之后探测链依旧是完整的。","breadcrumbs":"48. 解密集合的实现原理 » 字典和集合的哈希表的差异","id":"208","title":"字典和集合的哈希表的差异"},"209":{"body":"以上我们就剖析了集合的底层结构以及它的创建过程，不难发现集合的实现比字典要简单很多，并且集合没有自己的缓存池。 下一篇文章来介绍集合的相关操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"48. 解密集合的实现原理 » 小结","id":"209","title":"小结"},"21":{"body":"type 和 object 两者的关系估计会让很多人感到困惑，我们说 type 站在类型金字塔的顶端，任何对象按照类型追根溯源，最终得到的都是 type。而 object 站在继承金字塔的顶端，任何类型对象按照继承关系追根溯源，最终得到的都是 object。 因此我们可以得出以下结论： type 的父类是 object object 的类型是 type 验证一下： print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 打印结果说明结论正确，但这就奇怪了，type 的父类是 object，而 object 的类型又是 type，那么问题来了，是先有 type 还是先有 object 呢？带着这些疑问，开始下面的内容。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 楔子","id":"21","title":"楔子"},"210":{"body":"本篇文章来聊一聊集合支持的操作，比如元素的添加、删除，以及集合的扩容等等。并且集合还支持交集、并集、差集等运算，它们又是如何实现的呢？下面就一起来看一看。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 楔子","id":"210","title":"楔子"},"211":{"body":"调用 add 方法可以向集合添加一个元素，在底层会执行 set_add 函数。 // Objects/setobject.c\nstatic PyObject *\nset_add(PySetObject *so, PyObject *key)\n{ // 调用了 set_add_key 函数 if (set_add_key(so, key)) return NULL; // 返回 None Py_RETURN_NONE;\n} static int\nset_add_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值，由于字符串内部会缓存自身的哈希值，因此需要判断一下 // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1（尚未计算过） // 那么计算哈希值，但如果计算之后的结果是 -1，说明对象不支持哈希 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_add_entry return set_add_entry(so, key, hash);\n} 假设有一个集合 so，那么 so.add(\"abc\") 最终等价于 set_add_entry(so, \"abc\", hash(\"abc\"))，所以核心逻辑位于 set_add_entry 里面，看一下它的实现，代码比较长。 // Objects/setobject.c\nstatic int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *freeslot; setentry *entry; size_t perturb; size_t mask; size_t i; size_t j; int cmp; // 增加 key 的引用计数，当然这里的 key 指的就是集合的元素 Py_INCREF(key); restart: // mask 等于哈希表的容量减 1 mask = so->mask; // 和字典一样，让 hash & mask 计算出一个索引 i = (size_t)hash & mask; // 获取对应的 entry，里面包含了元素 key 和哈希值 // 如果 key == NULL，说明该位置还没有存储元素 // 此时就找到了合适的位置，跳转到 found_unused 标签 entry = &so->table[i]; if (entry->key == NULL) goto found_unused; freeslot = NULL; // perturb 初始等于哈希值 perturb = hash; while (1) { // 到这里说明指定的位置已经存储了元素，那么判断哈希值是否相同 // 如果哈希值不同，那么 key 一定不相同 // 如果哈希值相同，那么 key 不一定相同 if (entry->hash == hash) { // 所以当哈希值相等时，还要比较新添加的 key 和已存在的 key 是否相同 PyObject *startkey = entry->key; assert(startkey != dummy); 、// 这里的 startkey 和 key 都是 C 的变量，它们都是指针 // 如果两者相等，说明指向的是同一个对象，那么直接判定为相等，于是跳转到 found_active 标签 if (startkey == key) // 相当于 Python 的 is goto found_active; // 如果 startkey 和 key 不等，说明指向的不是同一个对象 // 那么比较值是否相等，相当于 Python 的 == // 这里是针对字符串的一个快分支 if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); // 如果 key 不是字符串，则执行通用比较逻辑 cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); // cmp > 0，说明结果为真，即两个 key 的值相等 // 跳转到 found_active 标签 if (cmp > 0) goto found_active; // cmp < 0 表示执行比较操作时出现错误，基本不会发生 if (cmp < 0) goto comparison_error; // 到这里说明两个 key 虽然映射出的索引是一样的，但它们的值不相等 // 那么要怎么办呢？显然要看下一个 entry 是否可用 // 然后下面这三行代码估计让人有些费解，所做的事情如下 // 如果在查询的过程中，哈希表扩容了，或者 key 发生了改变，那么跳转到 restart 标签重新执行 // 但因为 GIL 的存在，实际不会发生 if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } /* 如果是 Unused 态的 entry，那么 * entry->key == NULL * entry->hash == 0 * * 如果是 Dummy 态的 entry，那么 * entry->key == dummy * entry->hash == -1 * * 如果是 Active 态的 entry，那么 * entry->key == some key * entry->hash == some hash */ // 说明 entry 处于 dummy 态，将它赋值给 freeslot else if (entry->hash == -1) freeslot = entry; // 关于这一步是做什么的，一会儿解释 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // 到这里说明 (&so->table[i])->key 和添加的 key 不相等，即出现了索引冲突 // 那么要改变规则，重新映射，直到映射出一个可用的位置 perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) goto found_unused_or_dummy; } found_unused_or_dummy: // 如果 freeslot == NULL，说明没有撞上 Dummy 态的 entry // 跳转到 found_unused 标签 if (freeslot == NULL) goto found_unused; // 否则说明撞上了 Dummy 态的 entry // 集合的长度加 1，或者说 Active 态的 entry 个数加 1 so->used++; // 更新 key 和 hash freeslot->key = key; freeslot->hash = hash; return 0; found_unused: // 执行到这里，说明找到了新的可用位置 // 那么不光 used 要加 1，fill 也要加 1 so->fill++; so->used++; // 更新 key 和 hash entry->key = key; entry->hash = hash; // 如果哈希表的 entry 的个数（Active 态 + Dummy 态）没超过 mask * 3 / 5 // 那么目前的容量是合理的，直接返回 if ((size_t)so->fill*5 < mask*3) return 0; // 否则进行扩容，因为扩容的时候会丢弃 Dummy 的 entry // 所以扩容之后的容量取决于 used，而不是 fill // 如果 used 大于 50000，那么 2 倍扩容，否则 4 倍扩容 return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4); found_active: // 执行到这里，说明添加的元素已经存在了 // 那么减少 key 的引用计数，然后返回 Py_DECREF(key); return 0; comparison_error: // 执行比较操作时出现错误，应该抛出异常，但这一步基本不会发生 Py_DECREF(key); return -1;\n} 所以整个过程和字典是类似的，依旧是将哈希值和 mask 按位与，得到索引，通过索引找到对应的 entry。接下来对 entry 分情况讨论。 如果 entry->key == NULL。 说明找到了可用的 entry，那么直接跳转到 found_unused 标签，然后修改 entry 的 key 和 hash 字段，这样新元素就添加成功了。 如果 entry->hash == hash。 说明找到的 entry 处于 Active 态，那么比较两个 key 是否相等。如果相等，证明添加的元素已存在，则不插入，直接减少引用计数，因为不是字典，不存在更新一说。但如果两个 key 不相等，说明出现索引冲突，那么要映射出一个新的索引，并且映射的方式和字典也是一样的。 perturb >>= PERTURB_SHIFT;\ni = (i * 5 + 1 + perturb) & mask; 但字典和集合有一处不同，就是集合这里多了一个 for 循环。 // Objects/setobject.c\n#define LINEAR_PROBES 9 static int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ // ... while (1) { // ... // 当前映射出的索引为 i，如果 i + 9 没有超过 mask，那么循环 9 次 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // ... } // ...\n} 当映射出的索引相同、但 key 不相同时，说明出现了索引冲突，对于字典来说，会立即重新映射，找到一个新的索引。而集合由于只用一个数组存储，可以有更好的做法。我们知道 CPU 是有缓存的，像 L1 Cache 加载数据会一次性加载 64 字节，称为一个 cache line。所以通过索引遍历包含 16 个 int32 的数组，每次 i++ 和每次 i += 4 的耗时是差不多的。 对于集合来说，因为映射出的索引是随机的，使得对应的 entry 可能不在 cache 中，从而导致 CPU 下一次要重新读取。所以 Python 引入了 LINEAR_PROBES，从当前的 entry 开始，向后查找 9 个 entry。如果还找不到可用位置，然后才重新计算，从而提高 cache 的稳定性。 如果 entry->hash == -1，或者说 entry->key == dummy。 说明撞上了一个 Dummy 态的 entry，但估计有人又注意到了一个问题。 就是在发现 Dummy 态的 entry 之后，为啥没有立即跳转到 found_unused_or_dummy 标签，而是要继续循环呢？ 很简单，我们假设在发现 Dummy 态的 entry 之后立即跳转，看看会有什么后果。首先向集合添加一个元素 x，再添加一个元素 y，但 y 和 x 映射出的索引相同，那么在添加 y 的时候，会形成一条探测链，对应的元素就是 x->y。然后再将 x 删除，那么 x->y 就变成了 dummy->y。这时候如果再重新添加一个元素 y，那么肯定会撞上 Dummy 态的 entry，于是 dummy->y 就变成了 y->y。 所以当发现 Dummy 态的 entry 之后，如果立即跳转，就会无法消除集合的重复元素。因此正确的做法是先用变量保存起来，这里赋值给了 freeslot，然后继续查找。如果找到了相同的元素，那么就不添加了，因为集合中的元素是唯一的。但如果最后找到的 entry 的 key 为空，说明元素不存在，此时才能跳转到 found_unused_or_dummy 标签，然后对 freeslot 进行判断。如果不为空，说明撞上了 Dummy 态的 entry，那么直接复用该 entry 即可。 以上就是集合添加元素的过程，当然如果找到的是 Unused 态的 entry，还要判断容量的问题。如果 Active 态 + Dummy 态的 entry 个数不小于 3/5*mask，那么扩容，扩容的规则是判断 Active 态的 entry 个数是否大于 50000，是的话就 2 倍扩容，否则 4 倍扩容；","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » add 方法：添加元素","id":"211","title":"add 方法：添加元素"},"212":{"body":"调用 pop 方法，可以从集合中弹出一个元素，在底层会执行 set_pop 方法。 // Objects/setobject.c static PyObject *\nset_pop(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ // so->table 是指向 entry 数组首元素的指针 // so->finger 是做什么的，稍后解释，总之它是一个整数 // so->mask 等于 entry 数组的长度减 1，用于将取模运算优化成按位与运算 // 因此 so->finger & so->mask 会得到一个 0 ~ mask 之间的整数，我们记为 n // 显然这里的变量 entry 会指向 entry 数组中索引 n 的元素 setentry *entry = so->table + (so->finger & so->mask); // 变量 limit 则指向 entry 数组中最后一个元素（索引为 mask） setentry *limit = so->table + so->mask; PyObject *key; // 如果集合长度为 0，那么 pop 方法会抛出 KeyError if (so->used == 0) { PyErr_SetString(PyExc_KeyError, \"pop from an empty set\"); return NULL; } // entry 有三种状态，但显然弹出的 entry 一定是 Active 态 // 所以如果 entry 处于 Unused 或 Dummy 态，直接下一轮循环 while (entry->key == NULL || entry->key==dummy) { entry++; // 我们记 so->finger & so->mask 的结果为 n // 所以相当于从 entry 数组中索引为 n 的位置开始遍历 // 如果遍历到最后一个位置，也没找到 Active 态的 entry，那么从头开始遍历 if (entry > limit) entry = so->table; // 让变量 entry 指向 entry 数组的首元素 // 所以不难发现，整个过程是先遍历 entry 数组中 [n: limit] 的部分 // 如果没有找到 Active 态 entry，那么将 entry 重置为 so->table，从头开始遍历 // 因为执行到这里，说明 so->used 大于 0，即集合的长度大于 0 // 那么当 entry > limit 时，在 entry 数组 [0: n] 的部分，一定存在 Active 态的 entry } // pop 方法会返回弹出的元素，所以获取 entry->key key = entry->key; // 元素被弹出了，对应的 entry 要进行伪删除，所谓的伪删除就是设置一个特殊的墓碑值 // 所以将 entry->key 设置为 dummy，将 entry->hash 设置为 -1 entry->key = dummy; entry->hash = -1; // 集合的长度减 1 so->used--; // 将 finger 更新为被删除的 entry 在 entry 数组中的索引加 1 so->finger = entry - so->table + 1; /* next place to start */ return key;\n} 所以删除的过程还是很简单的，如果不考虑 finger 字段，你就可以简单理解为遍历整个 entry 数组，找到 Active 态的 entry，然后删除即可。只是这么做会导致每次 pop 时，都要重头开始遍历数组。 而当引入了 finger 字段之后，由于该字段初始为 0，所以第一次 pop 时，会从数组的头部开始遍历。假设删除的是数组中索引为 n 的 entry，那么删除之后 finger 字段会被赋值为 n + 1，那么下一次 pop 就会从数组中索引为 n + 1 的 entry 开始遍历。 我们通过 ctypes 来验证这一点： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {11, 22, 33, 44}\n# 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\n# 对于整数来说，它的哈希值等于自身\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 33\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# finger 初始为 0，因此在 pop 元素的时候会从头开始遍历数组\n# 找到第一个 Active 态的 entry\nprint(py_set_obj.finger)\n\"\"\"\n0\n\"\"\" # 显然第一次 pop 出的元素是 33\nprint(s.pop())\n\"\"\"\n33\n\"\"\"\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 -1\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# 因为被伪删除了\n# 所以索引为 1 的 entry->key 会被设置为 NULL，entry->hash 被设置为 -1\n# 至于 finger 则等于 1 + 1，下一次 pop 时，会从索引为 2 的位置开始遍历\nprint(py_set_obj.finger)\n\"\"\"\n2\n\"\"\" # 那么同理，再次 pop 的时候，会弹出 11，然后 finger 变为 3 + 1 = 4\nprint(s.pop())\n\"\"\"\n11\n\"\"\"\nprint(py_set_obj.finger)\n\"\"\"\n4\n\"\"\" 以上就是 finger 字段的作用，它避免了每次都要从头遍历 entry 数组。从这里也不难发现，当一个集合不断执行 pop 方法，将所有元素依次弹出时，这些元素的顺序和直接遍历 entry 数组拿到的元素的顺序是一致的。 item1 = 22333\nitem2 = 177\nitem3 = 520\nitem4 = 10086\n# 将它们映射成索引，由于是 4 个元素，因此哈希表容量为 8\nindex1 = item1 & 7\nindex2 = item2 & 7\nindex3 = item3 & 7\nindex4 = item4 & 7\nprint(index1, index2, index3, index4)\n\"\"\"\n5 1 0 6\n\"\"\"\n# 所以如果将 item1、item2、item3、item4 放到集合中\n# 不管怎么排列，最终都是下面这个结果\n# item3 会位于 entry 数组中索引为 0 的位置\n# item2 会位于 entry 数组中索引为 1 的位置\n# item1 会位于 entry 数组中索引为 5 的位置\n# item4 会位于 entry 数组中索引为 6 的位置 # 所以不管是弹出元素，还是遍历元素，亦或是直接打印集合\n# 元素顺序一定是 item3、item2、item1、item4\ns1 = {item1, item2, item3, item4}\ns2 = {item2, item1, item4, item3}\ns3 = {item3, item1, item2, item4}\ns4 = {item4, item3, item2, item1}\nprint(s1) # {520, 177, 22333, 10086}\nprint(s2) # {520, 177, 22333, 10086}\nprint(s3) # {520, 177, 22333, 10086}\nprint(s4) # {520, 177, 22333, 10086}\nprint( item3, item2, item1, item4\n) # 520 177 22333 10086 怎么样，是不是对集合又有了更深刻的认识了呢？","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » pop 方法：弹出元素","id":"212","title":"pop 方法：弹出元素"},"213":{"body":"remove 方法可以接收参数，删除集合中指定的元素。除了 remove，还有一个 discard 方法，这两个方法的作用一模一样，都是用来删除指定元素。区别就是当删除的元素不存在时，remove 方法会抛出 KeyError，而 discard 方法不会。 remove 方法在底层对应 set_remove 函数，discard 方法在底层对应 set_discard 函数，而 set_remove 函数只比 set_discard 函数多了一个 if 判断，我们来看一下。 以上是 set_remove 函数，注意图中绿色方框的部分，如果要删除的元素不存在，那么 rv 会等于 DISCARD_NOTFOUND，于是抛出 KeyError。 如果将绿色方框里的 if 逻辑删掉，得到的就是 set_discard 函数的源码。所以这两个函数做的事情是一样的，区别就是 set_remove 会多做一层检测，当删除的元素不存在时，set_remove 会主动抛出一个 KeyError，而 set_discard 函数则什么也不做。 所以这里我们只看 set_remove 函数即可。 // Objects/setobject.c #define DISCARD_NOTFOUND 0\n#define DISCARD_FOUND 1 static PyObject *\nset_remove(PySetObject *so, PyObject *key)\n{ // 要删除的 key，或者说元素 // 当然啦，从 C 的层面来看，删除 key 其实就是删除数组中该 key 对应的 entry // 只不过这个删除是伪删除，即写入一个特殊的墓碑值 PyObject *tmpkey; int rv; // rv 表示删除结果，显然删除逻辑由 set_discard_key 函数实现 // 如果 rv < 0，表示删除元素时出现错误，比如传入了一个不可哈希的对象 // 如果 rv == 0，表示要删除的元素在集合中不存在 // 如果 rv == 1，表示成功将元素从集合中删除 rv = set_discard_key(so, key); if (rv < 0) { // 当传入一个不可哈希对象时，会抛出 TypeError // 我们知道集合也是不可哈希的，但如果要删除的 key 是集合类型 // 那么解释器会额外做一个兜底操作，我们一会儿通过 Python 代码演示 if (!PySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError)) return NULL; // 将回溯栈里的异常清空 PyErr_Clear(); // 基于集合里的元素创建不可变集合 tmpkey = make_new_set(&PyFrozenSet_Type, key); if (tmpkey == NULL) return NULL; // 然后尝试删除这个不可变集合，如果还删除失败，则报错 rv = set_discard_key(so, tmpkey); Py_DECREF(tmpkey); if (rv < 0) return NULL; } // 如果 rv == DISCARD_NOTFOUND，表示要删除的元素不存在 if (rv == DISCARD_NOTFOUND) { _PyErr_SetKeyError(key); // 抛出 KeyError return NULL; } Py_RETURN_NONE;\n} 我们看到当元素删除失败时，如果 key 是集合类型，那么解释器会做一个兜底操作，这是什么意思呢？我们演示一遍。 try: s = {[1, 2, 3]} # 列表不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" try: s = {{1, 2, 3}} # 同样，集合也不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'set'\n\"\"\" # 当我们尝试 remove 列表时，依旧会抛出相同的错误\ns = {1, 2, 3}\ntry: s.remove([])\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" # 但 remove 一个集合就不同了\ns = { frozenset({1, 2, 3}), frozenset({4, 5, 6}),\n}\n# 不可变集合是可哈希对象，因此它可以放在集合中，也可以被删除\ns.remove(frozenset({1, 2, 3}))\n# 但删除可变集合理论上应该和删除列表一样，抛出 TypeError: unhashable type: 'set'\n# 而事实上异常也确实产生了，保存在回溯栈中，但是从源码中我们看到，解释器会多做一个检测\n# 如果删除的 key 是集合类型，并且栈里的异常是 TypeError，那么将异常清空\n# 然后基于集合创建不可变集合，并尝试删除这个不可变集合\ns.remove({4, 5, 6})\n# 所以这里 s.remove({4, 5, 6}) 等价于 s.remove(frozenset({4, 5, 6}))\nprint(s)\n\"\"\"\nset()\n\"\"\"\n# 我们看到 s 里面的两个不可变集合被删除了 好，我们回到 set_remove 函数，它在删除元素时会调用 set_discard_key 函数，显然删除指定元素的核心逻辑位于此函数中，我们看一下它做了什么。 // Objects/setobject.c static int\nset_discard_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_discard_entry 函数 // 传入三个参数：集合、要删除的 key、以及 key 的哈希值 return set_discard_entry(so, key, hash);\n} static int\nset_discard_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; PyObject *old_key; // 将 key 映射成索引，并获取该索引对应的 entry 的指针 entry = set_lookkey(so, key, hash); // 因为 entry 数组申请好之后，内部的每个 entry 都拥有一块合法的内存 // 所以指针不可能为 NULL，如果为 NULL，证明内部出问题了 if (entry == NULL) // 基本不会发生 return -1; // 如果 entry->key 为 NULL，证明要删除的 key 不存在，返回 DISCARD_NOTFOUND // 当 set_remove 函数发现返回的是 DISCARD_NOTFOUND，会抛出 KeyError if (entry->key == NULL) return DISCARD_NOTFOUND; // 否则说明 key 存在 old_key = entry->key; // 因为被删除了，所以将 entry->key、entry->hash 设置为 dummy 和 -1 entry->key = dummy; entry->hash = -1; // 集合长度减 1 so->used--; // 减少 key 指向对象的引用计数，因为集合不再持有对它的引用 Py_DECREF(old_key); // 返回 DISCARD_FOUND return DISCARD_FOUND;\n} 以上就是 set_remove 函数删除指定元素的具体细节，逻辑并不复杂。但是里面出现了一个 set_lookkey 函数，它的作用是将哈希值映射成索引，并返回指定的 entry。至于该函数的逻辑也很简单，它和 set_add 函数里面的逻辑是重复的。 static setentry *\nset_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *entry; size_t perturb; size_t mask = so->mask; size_t i = (size_t)hash & mask; /* Unsigned for defined overflow behavior */ size_t j; int cmp; entry = &so->table[i]; if (entry->key == NULL) return entry; perturb = hash; while (1) { if (entry->hash == hash) { PyObject *startkey = entry->key; /* startkey cannot be a dummy because the dummy hash field is -1 */ assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) /* unlikely */ return NULL; if (table != so->table || entry->key != startkey) /* unlikely */ return set_lookkey(so, key, hash); if (cmp > 0) /* likely */ return entry; mask = so->mask; /* help avoid a register spill */ } if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) return entry; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) return NULL; if (table != so->table || entry->key != startkey) return set_lookkey(so, key, hash); if (cmp > 0) return entry; mask = so->mask; } } } perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) return entry; }\n} 显然该函数的逻辑在介绍 set_add 函数的时候就说过了。 如果 entry->key 为空，说明找到了 Unused 态的 entry，即 key 不存在，那么直接将 entry 返回即可。 如果 entry->key 不为空，那么比较 entry->hash 和传入的 hash 是否相等，如果哈希值不相等，那么 key 一定不相等，说明出现了索引冲突。当然啦，如果 entry 处于 Dummy 态，那么哈希值肯定也不相等，但不管哪一种，都要重新映射。 如果哈希值相等，那么比较 key 是否相等，如果 key 相等，说明查找的 key 存在于集合中，那么返回对应的 entry。如果 key 不相等，则重新映射。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » remove 方法：删除指定元素","id":"213","title":"remove 方法：删除指定元素"},"214":{"body":"调用 copy 方法可以拷贝一个集合，在底层会执行 set_copy 方法。 // Objects/setobject.c static PyObject *\nset_copy(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ return make_new_set_basetype(Py_TYPE(so), (PyObject *)so);\n} static PyObject *\nmake_new_set_basetype(PyTypeObject *type, PyObject *iterable)\n{ if (type != &PySet_Type && type != &PyFrozenSet_Type) { if (PyType_IsSubtype(type, &PySet_Type)) type = &PySet_Type; else type = &PyFrozenSet_Type; } return make_new_set(type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为集合申请内存 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 字段初始化，显然刚创建的集合的容量为 8 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 调用 set_update_internal 函数，将可迭代对象的元素添加到集合中 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} static int\nset_update_internal(PySetObject *so, PyObject *other)\n{ // 参数 so 表示集合，other 表示可迭代对象 PyObject *key, *it; // 如果 other 的类型也是集合（或者不可变集合），那么调用 set_merge 函数 if (PyAnySet_Check(other)) return set_merge(so, other); // 否则检测 other 是否为字典 if (PyDict_CheckExact(other)) { PyObject *value; Py_ssize_t pos = 0; Py_hash_t hash; Py_ssize_t dictsize = PyDict_GET_SIZE(other); // 判断 so->fill + dictsize 是否达到了 so->mask 的 3/5 // 如果达到了，那么扩容 if (dictsize < 0) return -1; if ((so->fill + dictsize)*5 >= so->mask*3) { if (set_table_resize(so, (so->used + dictsize)*2) != 0) return -1; } // 遍历字典，将字典的 key 和 hash 包装成 entry，添加到数组中，value 丢弃 // 这里调用的是 set_add_entry 函数，我们介绍集合的 add 方法时说过 while (_PyDict_Next(other, &pos, &key, &value, &hash)) { if (set_add_entry(so, key, hash)) return -1; } return 0; } // 到这里说明 other 不是字典，那么迭代出来的整体就是 key // 基于可迭代对象创建迭代器 it = PyObject_GetIter(other); if (it == NULL) return -1; // 将元素迭代出来 while ((key = PyIter_Next(it)) != NULL) { // 调用 set_add_key 函数，它内部会先计算 key 的哈希值 // 然后调用 set_add_entry 函数，添加元素 if (set_add_key(so, key)) { Py_DECREF(it); Py_DECREF(key); return -1; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) return -1; return 0;\n} 以上就是集合的 copy 方法的底层实现，非常简单。说白了就是先创建一个新的集合，然后调用 set_update_internal 函数将老集合里面的元素拷贝过去。当然啦，该函数可以拷贝任意可迭代对象里的元素，不仅仅是集合。只是当可迭代对象是集合时，会单独调用 set_merge 函数，如果不是集合，那么会直接遍历。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » copy 方法：拷贝一个集合","id":"214","title":"copy 方法：拷贝一个集合"},"215":{"body":"调用 update 方法，可以合并多个可迭代对象，举例说明。 s = {1, 2, 3}\ns.update([4, 5, 6], (7, 8, 9))\nprint(s)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" 相信你已经知道底层是怎么做的了，获取每个可迭代对象，然后调用 set_update_internal 函数即可。那么底层是不是这么做的呢？我们来看一下，update 方法在底层对应 set_update 函数。 // Objects/setobject.c static PyObject *\nset_update(PySetObject *so, PyObject *args)\n{ Py_ssize_t i; for (i=0 ; i<PyTuple_GET_SIZE(args) ; i++) { PyObject *other = PyTuple_GET_ITEM(args, i); if (set_update_internal(so, other)) return NULL; } Py_RETURN_NONE;\n} 跟我们分析的一样，非常简单。 另外集合还有一个 union 方法，功能和 update 方法类似，但它会返回一个新的集合。 s1 = {1, 2, 3}\ns1.update([4, 5, 6], (7, 8, 9))\nprint(s1)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" s2 = {1, 2, 3}\ns2_new = s2.union([4, 5, 6], (7, 8, 9))\nprint(s2)\nprint(s2_new)\n\"\"\"\n{1, 2, 3}\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" update 方法会原地修改，而 union 方法会返回新的集合，不会影响原有的集合。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » update 方法：合并多个可迭代对象","id":"215","title":"update 方法：合并多个可迭代对象"},"216":{"body":"集合还有一些常用的方法，只不过我们更倾向于使用操作符的形式。 s1 & s2：对两个集合做交集运算，返回新的集合，里面包含同时出现在 s1 和 s2 当中的元素； s1 | s2：对两个集合做并集运算，返回新的集合，里面包含出现在 s1 或 s2 当中的元素； s1 - s2：对两个集合做差集运算，返回新的集合，里面包含出现在 s1 当中、但没有出现在 s2 当中的元素； s1 ^ s2：对两个集合做对称差集运算，返回新的集合，里面包含只出现在 s1 当中、或只出现在 s2 当中的元素； s1 == s2：判断两个集合的元素是否完全相同； s1 >= s2：判断 s2 是否是 s1 的子集，如果是，那么 s2 - s1 == {}。 s1 <= s2：判断 s1 是否是 s2 的子集，如果是，那么 s1 - s2 == {}。 s1 > s2：判断 s2 是否是 s1 的真子集； s1 < s2：判断 s1 是否是 s2 的真子集； 注意：在使用这些操作符时，两侧的 s1 和 s2 都要求是集合类型。但如果使用操作符对应的方法，那么则不要求 s2 是集合类型，只要是可迭代对象即可。 # 做交集运算\ns = {\"a\", \"b\", \"c\"}\nprint(s.intersection(\"bcd\"))\n\"\"\"\n{'b', 'c'}\n\"\"\"\n# print(s & \"bcd\") # TypeError 这些方法都非常的有用，可以自己测试一下，加深一遍印象。至于这些方法的底层实现，感兴趣也可以去 Objects/setobject.c 中探索一番，方法都定义在 set_methods 数组中。这里我们就以集合的交集运算为例，看一下实现过程。 // Objects/setobject.c // 判断集合是否包含某个元素\nstatic int\nset_contains_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; // 调用 set_lookkey，返回 entry // 如果 entry->key 不为空，证明元素存在，否则不存在 entry = set_lookkey(so, key, hash); if (entry != NULL) return entry->key != NULL; return -1;\n} // 两个集合做交集运算，返回新的集合\nstatic PyObject *\nset_intersection(PySetObject *so, PyObject *other)\n{ PySetObject *result; PyObject *key, *it, *tmp; Py_hash_t hash; int rv; // 快分支：如果两个集合相等，那么直接把其中一个拷贝一份 if ((PyObject *)so == other) return set_copy(so, NULL); // 否则创建一个新的空集合 result = (PySetObject *)make_new_set_basetype(Py_TYPE(so), NULL); if (result == NULL) return NULL; // 如果 other 是集合 if (PyAnySet_Check(other)) { Py_ssize_t pos = 0; setentry *entry; // 如果 len(other) > len(so)，那么两者交换位置，也就是遍历元素较少的集合 if (PySet_GET_SIZE(other) > PySet_GET_SIZE(so)) { tmp = (PyObject *)so; so = (PySetObject *)other; other = tmp; } // 遍历集合 other while (set_next((PySetObject *)other, &pos, &entry)) { key = entry->key; hash = entry->hash; // 判断 key 是否存在于集合 so 中 rv = set_contains_entry(so, key, hash); if (rv < 0) { Py_DECREF(result); return NULL; } // 如果存在，那么添加到新集合 result 中 if (rv) { if (set_add_entry(result, key, hash)) { Py_DECREF(result); return NULL; } } } return (PyObject *)result; } // 如果 other 不是集合，那么获取它的迭代器 it = PyObject_GetIter(other); if (it == NULL) { Py_DECREF(result); return NULL; } // 直接迭代内部的元素，以下逻辑和上面类似 while ((key = PyIter_Next(it)) != NULL) { hash = PyObject_Hash(key); if (hash == -1) goto error; // 如果 key 在 so 中存在，那么添加到 result 中 rv = set_contains_entry(so, key, hash); if (rv < 0) goto error; if (rv) { if (set_add_entry(result, key, hash)) goto error; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) { Py_DECREF(result); return NULL; } return (PyObject *)result; error: Py_DECREF(it); Py_DECREF(result); Py_DECREF(key); return NULL;\n} 以上就是集合的交集运算，至于其它的运算操作也是类似的，感兴趣可以看一下。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 其它的一些方法","id":"216","title":"其它的一些方法"},"217":{"body":"关于集合相关的内容我们就介绍完了，当然到目前为止，Python 的内置数据结构也基本介绍完了。回顾一下我们介绍了哪些数据结构： 浮点数； 整数； 复数； 布尔值 None； 切片； bytes 对象； bytearray 对象； 字符串； 列表； 元组； 字典； 集合； 以上这些结构都是内置的，当然还有一些数据结构是定义在标准库里面的，我们后面再说。 下一篇文章来介绍迭代器。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 小结","id":"217","title":"小结"},"218":{"body":"只要类型对象实现了 __iter__，那么它的实例对象就被称为可迭代对象（Iterable），比如字符串、元组、列表、字典、集合等等。而整数、浮点数，由于其类型对象没有实现 __iter__，所以它们不是可迭代对象。 from typing import Iterable print( isinstance(\"\", Iterable), isinstance((), Iterable), isinstance([], Iterable), isinstance({}, Iterable), isinstance(set(), Iterable),\n) # True True True True True print( isinstance(0, Iterable), isinstance(0.0, Iterable),\n) # False False 可迭代对象的一大特点是可以被 for 循环遍历，但能被 for 循环遍历的则不一定是可迭代对象。我们举个例子： class A: def __getitem__(self, item): return f\"参数 item: {item}\" a = A()\n# 内部定义了 __getitem__\n# 首先可以让实例对象像字典一样访问属性\nprint(a[\"name\"]) # 参数 item: name\nprint(a[\"satori\"]) # 参数 item: satori # 此外还可以像可迭代对象一样被 for 循环\n# 循环的时候会自动给 item 传值：0 1 2 3 ...\n# 如果内部出现了 StopIteration，循环结束\n# 否则会一直循环下去，这里我们手动 break\nfor idx, val in enumerate(a): print(val) if idx == 5: break\n\"\"\"\n参数 item: 0\n参数 item: 1\n参数 item: 2\n参数 item: 3\n参数 item: 4\n参数 item: 5\n\"\"\" 所以实现了 __getitem__ 的类的实例，也是可以被 for 循环的，但它并不是可迭代对象。 from typing import Iterable\nprint(isinstance(a, Iterable)) # False 总之判断一个对象是否是可迭代对象，就看它的类型对象有没有实现 __iter__。可迭代对象我们知道了，那什么是迭代器呢？很简单，调用可迭代对象的 __iter__ 方法，得到的就是迭代器。","breadcrumbs":"50. 迭代器是怎么实现的？ » 楔子","id":"218","title":"楔子"},"219":{"body":"不同类型的对象，都有自己的迭代器，举个栗子。 data = [1, 2, 3]\n# 底层调用的其实是 list.__iter__(data)\n# 或者说 PyList_Type.tp_iter(data)\nit = data.__iter__()\nprint(it)\n\"\"\"\n<list_iterator object at 0x102c1cf10>\n\"\"\"\nprint(str.__iter__(\"\"))\n\"\"\"\n<str_iterator object at 0x100e623b0>\n\"\"\"\nprint(tuple.__iter__(()))\n\"\"\"\n<tuple_iterator object at 0x100e623b0>\n\"\"\"\n# 不难发现，迭代器的种类非常多\n# 比如 list_iterator、str_iterator、tuple_iterator 等等 迭代器也是可迭代对象，只不过迭代器内部的 __iter__ 返回的还是它本身。当然啦，在创建迭代器的时候，我们更常用内置函数 iter。 data = [1, 2, 3]\n# 等价于 type(data).__iter__(data)\nit = iter(data) 但是 iter 函数还有一个鲜为人知的用法，我们来看一下： val = 0 def foo(): global val val += 1 return val # iter 可以接收一个参数: iter(可迭代对象)\n# iter 也可以接收两个参数: iter(可调用对象, value)\nfor i in iter(foo, 5): print(i)\n\"\"\"\n1\n2\n3\n4\n\"\"\" 进行迭代的时候，会不停地调用可调用对象，直到返回值等于传递的第二个参数 value（在底层被称为哨兵），然后终止迭代。我们看一下 iter 函数的底层实现。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *v; // 内置函数 iter 接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"iter\", nargs, 1, 2)) return NULL; // 如果 nargs 等于 1，那么 args[0] 是可迭代对象 // 如果 nargs 等于 2，那么 args[0] 是可调用对象 v = args[0]; // nargs == 1，说明 v 是可迭代对象 if (nargs == 1) // 调用 PyObject_GetIter 获取对象的迭代器 return PyObject_GetIter(v); // 否则说明 nargs == 2，那么 v 是可调用对象 // 这里进行检测，如果不是，抛出 TypeError if (!PyCallable_Check(v)) { PyErr_SetString(PyExc_TypeError, \"iter(v, w): v must be callable\"); return NULL; } // 获取哨兵 PyObject *sentinel = args[1]; // 一会儿单独解释 return PyCallIter_New(v, sentinel);\n} 以上就是 iter 函数的内部逻辑，既可以接收一个参数，也可以接收两个参数。这里我们只看接收一个可迭代对象的情况，所以核心就在 PyObject_GetIter 函数里面，它是根据可迭代对象生成迭代器的关键，我们来看一下它的逻辑是怎样的？ // Objects/abstract.c\nPyObject *\nPyObject_GetIter(PyObject *o)\n{ // 获取可迭代对象的类型对象，比如 o 是列表，那么 t 就是 list PyTypeObject *t = o->ob_type; // 我们说类型对象定义的操作，决定了实例对象的行为 // 实例对象调用的那些方法都是定义在类型对象里面的 // 还是那句话：obj.func() 等价于 type(obj).func(obj) getiterfunc f; // 所以这里是获取类型对象的 tp_iter 字段 // 也就是 Python 中的 __iter__ f = t->tp_iter; // 如果 f 为 NULL，说明类型对象的内部没有定义 __iter__ // 像 str、tuple、list 等类型对象，它们的 tp_iter 字段都是不为 NULL 的 if (f == NULL) { // 如果 tp_iter 为 NULL，那么解释器会退而求其次 // 检测该类型对象中是否定义了 __getitem__ // 如果定义了，那么直接调用 PySeqIter_New，创建 seqiterobject 对象 // 下面的 PySequence_Check 函数负责检测类型对象是否实现了 __getitem__ // __getitem__ 对应 tp_as_sequence->sq_item if (PySequence_Check(o)) return PySeqIter_New(o); // 走到这里说明该类型对象既没有 __iter__、也没有 __getitem__ // 因此它的实例对象不具备可迭代的性质，于是抛出异常 return type_error(\"'%.200s' object is not iterable\", o); } else { // 否则说明定义了 __iter__ // 调用 o->ob_type->tp_iter(o) 返回对应的迭代器 PyObject *res = (*f)(o); // 但如果返回值 res 不为 NULL、并且还不是迭代器 // 证明 __iter__ 的返回值有问题，于是抛出异常 if (res != NULL && !PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, \"iter() returned non-iterator \" \"of type '%.100s'\", res->ob_type->tp_name); Py_DECREF(res); res = NULL; } // 返回 res return res; }\n} 以上便是 iter 函数的底层实现，还是很简单的。然后是里面的 __getitem__，我们说如果类型对象内部没有定义 __iter__，那么解释器会退而求其次，检测内部是否定义了 __getitem__。 因此以上就是迭代器的创建过程，每个可迭代对象都有自己的迭代器，而迭代器本质上就是对原始数据的一层封装罢了。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的创建","id":"219","title":"迭代器的创建"},"22":{"body":"首先必须要澄清一个事实，类对象的类型是 type，这句话是没有问题的。但如果说类对象都是由 type 创建的，就有些争议了。因为 type 能够创建的是自定义的类，而内置的类在底层是预先定义好的。 # int、tuple、dict 等内置类型\n# 在底层是预先定义好的，以全局变量的形式存在\n# 我们直接就可以拿来用\nprint(int) # <class 'int'>\nprint(tuple) # <class 'tuple'> # 但对于自定义的类，显然就需要在运行时动态创建了\n# 而创建这一过程，就交给 type 来做\nclass Girl: pass 然后 type 也只能对自定义类进行属性上的增删改，内置的类则不行。 class Girl: pass # 给类对象增加一个成员函数\ntype.__setattr__( Girl, \"info\", lambda self: \"name: 古明地觉, age: 17\"\n)\n# 实例化之后就可以调用了\nprint(Girl().info()) # name: 古明地觉, age: 17 # 但内置的类对象，type 是无法修改的\ntry: type.__setattr__(int, \"a\", \"b\")\nexcept TypeError as e: print(e)\n\"\"\"\ncan't set attributes of built-in/extension type 'int'\n\"\"\" 上一篇文章中我们说了，Python 所有的类型对象（包括 type）都是由 PyTypeObject 结构体实例化得到的，只不过结构体字段的值不同，得到的类也不同。并且内置的类型对象在底层是预定义好的，它们在解释器看来是同级别的，不存在谁创建谁。 而每一个对象都有引用计数和类型，然后解释器将这些类对象的类型都设置成了 type，我们举例说明。不过在此之前，需要先说一个宏。 // Include/object.h // _PyObject_EXTRA_INIT 可以忽略掉\n// 我们看到这个宏是用来初始化引用计数和类型的\n#define PyObject_HEAD_INIT(type) \\ { _PyObject_EXTRA_INIT \\ 1, type }, // 负责初始化引用计数、类型和 ob_size\n#define PyVarObject_HEAD_INIT(type, size) \\ { PyObject_HEAD_INIT(type) size }, 下面我们来看几个类型对象。 我们看到所有类型对象的类型都被设置成了 &PyType_Type，也就是 Python 里的 type。所以结论很清晰了，虽然内置的类型对象可以看做是 type 的实例对象，但它却不是由 type 实例化得到的，而是在底层预定义好，并以全局变量的形式静态出现。 所以内置的类型对象之间不存在谁创建谁，它们都是预定义好的，只是在定义的时候，将自身的类型设置成了 type 而已，包括 type 本身（类型还是 type）。这样一来，每一个对象都会有一个类型，从而将面向对象理念贯彻的更加彻底。 print(int.__class__)\nprint(tuple.__class__)\nprint(set.__class__)\nprint(type.__class__)\n\"\"\"\n<class 'type'>\n<class 'type'>\n<class 'type'>\n<class 'type'>\n\"\"\" print( type.__class__.__class__.__class__ is type\n) # True print( type(type(type(type(type(type))))) is type\n) # True 好，说完了这些之后我们来正式考察 type 和 object 的底层实现。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类是由谁创建的","id":"22","title":"类是由谁创建的"},"220":{"body":"由于迭代器的种类非常多，字符串、元组、列表等等，都有自己的迭代器，这里就不一一介绍了。我们就以列表的迭代器为例，看看迭代器在底层的结构是怎么样的。 // Objects/listobject.c // 列表迭代器的类型对象为 <class 'list_iterator'>\n// 但这个类，解释器并没有暴露给我们，所以需要通过 type 获取\n// 然后它的 tp_basicsize 字段为 sizeof(listiterobject)\n// 这就说明列表迭代器在底层由 listiterobject 结构体表示\nPyTypeObject PyListIter_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"list_iterator\", /* tp_name */ sizeof(listiterobject), /* tp_basicsize */ 0, /* tp_itemsize */ // ...\n}; typedef struct { PyObject_HEAD Py_ssize_t it_index; // 指向创建该迭代器的列表 PyListObject *it_seq;\n} listiterobject; 所以迭代器就是基于可迭代对象进行了一层简单的封装，所谓元素迭代本质上还是基于索引，并且每迭代一次，索引就自增 1。一旦出现索引越界，就将 it_seq 设置为 NULL，表示迭代器迭代完毕。 我们实际演示一下： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_size\", c_void_p) ] class ListIterObject(PyObject): _fields_ = [ (\"it_index\", c_ssize_t), (\"it_seq\", POINTER(PyObject)) ] it = iter([1, 2, 3])\nit_obj = ListIterObject.from_address(id(it)) # it_seq 指向列表 [1, 2, 3]，it_index 初始为 0\nprint(it_obj.it_index) # 0\n# 进行迭代\nnext(it)\n# 索引自增 1，此时 it_index 等于 1\nprint(it_obj.it_index) # 1\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 2\nprint(it_obj.it_index) # 2\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 3\nprint(it_obj.it_index) # 3 当 it_index 为 3 的时候，如果再次迭代，那么底层会发现 it_index 已超过最大索引，于是知道迭代器已经迭代完毕了。因此会将 it_seq 设置为 NULL，并抛出 StopIteration。如果是 for 循环，那么会自动捕获此异常，然后停止循环。 所以这就是迭代器，真的没有想象中的那么神秘，甚至在知道它的实现原理之后，还觉得有点 low，因为就是将原始数据包了一层，加了一个索引而已。所谓的迭代仍然是基于索引来做的，并且每迭代一次，索引就自增 1。当索引超出范围时，证明迭代完毕了，于是将 it_seq 字段设置为 NULL，抛出 StopIteration。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的底层结构","id":"220","title":"迭代器的底层结构"},"221":{"body":"迭代器的创建我们知道了，那么它是怎么迭代元素的呢？首先迭代元素可以通过 next 函数，当然它本质上也是调用了对象的 __next__ 方法。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_next(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *it, *res; // 同样接收 1 ~ 2 个参数 // 因为调用 next 函数时，可以传入一个默认值 // 表示当迭代器没有元素可以迭代的时候，会返回指定的默认值 if (!_PyArg_CheckPositional(\"next\", nargs, 1, 2)) return NULL; // 迭代器 it = args[0]; // 类型检测，如果不是迭代器，那么抛出异常 if (!PyIter_Check(it)) { PyErr_Format(PyExc_TypeError, \"'%.200s' object is not an iterator\", it->ob_type->tp_name); return NULL; } // it->ob_type 表示获取类型对象，也就是该迭代器的类型 // 当然具体类型是哪一种并不确定，可能是列表迭代器、元组迭代器、字符串迭代器等等 // 然后再获取 tp_iternext 字段，相当于 __next__ // 拿到函数指针之后，传入迭代器进行调用 res = (*it->ob_type->tp_iternext)(it); // 如果 res 不为 NULL，那么证明迭代到值了，直接返回 if (res != NULL) { return res; } else if (nargs > 1) { // 否则的话，说明没有迭代到值（返回 NULL），而这时候有两种情况 // 1）迭代器已耗尽，2）在迭代过程中出现异常 // 那么判断 nargs 是否大于 1，如果大于 1，说明设置了默认值 PyObject *def = args[1]; // 检测异常是不是迭代完毕时（或者手动 raise）产生的 StopIteration 异常 if (PyErr_Occurred()) { if(!PyErr_ExceptionMatches(PyExc_StopIteration)) // 如果不是，说明程序的逻辑有问题，直接 return NULL，结束执行 // 然后在 Python 里面我们会看到打印到 stderr 中的异常信息 return NULL; // 如果异常是 StopIteration，证明迭代完毕了 // 但我们设置了默认值，那么就应该返回默认值 // 而不应该抛出 StopIteration，于是将异常回溯栈给清空 PyErr_Clear(); } // 增加默认值的引用计数，然后返回 Py_INCREF(def); return def; } else if (PyErr_Occurred()) { // 走到这里说明 res == NULL，并且没有指定默认值 // 那么当发生异常时，将异常直接抛出 return NULL; } else { // 都不是的话，直接抛出 StopIteration PyErr_SetNone(PyExc_StopIteration); return NULL; }\n} 以上就是 next 函数的背后逻辑，实际上还是调用了迭代器的 __next__ 方法。 data = [1, 2, 3]\nit = iter(data)\n# 然后迭代，等价于 next(it)\nprint(type(it).__next__(it)) # 1\nprint(type(it).__next__(it)) # 2\nprint(type(it).__next__(it)) # 3\n# 但是 next 可以指定默认值\n# 如果不指定默认值，或者还是 type(it).__next__(it)\n# 那么就会报错，抛出 StopIteration\nprint(next(it, 666)) # 666 以上就是元素的迭代，由于内置函数 next 还可以指定一个默认值，所以更强大一些。当然在不指定默认值的情况下，next(it) 和 type(it).__next__(it) 最终是殊途同归的。 我们仍以列表的迭代器为例，看看 __next__ 的具体实现。 由于 tp_iternext 字段指向了 listiter_next，证明迭代的时候调用的是这个函数。 // Objects/listobject.c\nstatic PyObject *\nlistiter_next(listiterobject *it)\n{ // 迭代器只是对可迭代对象的一层封装 // 如果是列表的迭代器，那么内部的 it_seq 字段便指向列表 PyListObject *seq; PyObject *item; assert(it != NULL); // 如果 it->it_seq 等于 NULL，说明迭代器已经迭代完毕了 // 从这里也能看出迭代器不能二次循环迭代 seq = it->it_seq; if (seq == NULL) return NULL; assert(PyList_Check(seq)); // 如果 it->it_index 小于列表的长度 if (it->it_index < PyList_GET_SIZE(seq)) { // 那么获取元素 item = PyList_GET_ITEM(seq, it->it_index); // it_index 自增 1 ++it->it_index; // 增加元素的引用计数，并返回 Py_INCREF(item); return item; } // 否则说明 it_index 已经达到了列表的长度 // 再迭代就索引越界了，而对于迭代器来说 // 当 it_index 等于列表长度时，就证明所有元素都迭代完毕了 it->it_seq = NULL; // 将 it_seq 设置为 NULL Py_DECREF(seq); return NULL;\n} 显然这和之前分析的是一样的，以上我们就以列表为例，考察了迭代器的实现原理和元素迭代的具体过程。当然其它对象也有自己的迭代器，有兴趣可以看一看，实现方式都大同小异。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器是怎么迭代元素的","id":"221","title":"迭代器是怎么迭代元素的"},"222":{"body":"前面说了，iter 函数如果接收一个参数，那么这个参数必须是可迭代对象。如果接收两个参数，那么第一个参数要是 callable，第二个参数是哨兵。迭代时会调用 callable，当返回值等于哨兵时，迭代结束，那么它的底层是怎么实现的呢？这里简单补充一下。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // ... PyObject *sentinel = args[1]; // 如果参数个数等于 2，会调用 PyCallIter_New return PyCallIter_New(v, sentinel);\n} // Objects/iterobject.c\ntypedef struct { PyObject_HEAD PyObject *it_callable; PyObject *it_sentinel;\n} calliterobject; PyObject *\nPyCallIter_New(PyObject *callable, PyObject *sentinel)\n{ // iter(callable, value) 会返回一个 <class 'callable_iterator'> 实例 // 在底层由 calliterobject 结构体实现 calliterobject *it; // 为 calliterobject 实例申请内存 it = PyObject_GC_New(calliterobject, &PyCallIter_Type); if (it == NULL) return NULL; // 初始化字段 Py_INCREF(callable); it->it_callable = callable; Py_INCREF(sentinel); it->it_sentinel = sentinel; _PyObject_GC_TRACK(it); return (PyObject *)it;\n} // 再来看看迭代过程\nstatic PyObject *\ncalliter_iternext(calliterobject *it)\n{ PyObject *result; // 如果 it_callable 字段为空，说明迭代结束，不能再次迭代 if (it->it_callable == NULL) { return NULL; } // 调用 it_callable，拿到返回值 result result = _PyObject_CallNoArg(it->it_callable); if (result != NULL) { int ok; // 如果 result 和哨兵相等，那么 ok == 1，否则 ok == 0 ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ); // ok == 0，说明两者不相等，那么返回 result if (ok == 0) { return result; } // ok > 0，说明返回值和哨兵相等，那么迭代结束 // 减少引用计数，并将 it_callable 和 it_sentinel 字段设置为 NULL Py_DECREF(result); if (ok > 0) { Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } } else if (PyErr_ExceptionMatches(PyExc_StopIteration)) { // 如果函数抛出了 StopIteration 异常，同样视为迭代结束 PyErr_Clear(); Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } return NULL;\n} 还是比较简单的，就是不停地调用可迭代对象，当返回值和哨兵相等时，迭代结束。","breadcrumbs":"50. 迭代器是怎么实现的？ » iter 函数接收两个参数","id":"222","title":"iter 函数接收两个参数"},"223":{"body":"通过探究迭代器，我们再次体会到了 Python 的设计哲学，虽然一切皆对象，但是拿到的都是对象的指针。像变量、函数参数等，它们存储的都不是对象本身，而是对象的泛型指针。而基于 PyObject * 和 ob_type，Python 巧妙地实现了多态。 不管变量 obj 指向什么样的可迭代对象，都可以交给 iter 函数，会调用类型对象内部的 __iter__（底层对应 tp_iter 字段），得到迭代器。不管变量 it 指向什么样的迭代器，都可以交给 next 函数进行迭代，会调用迭代器的类型对象的 __next__（底层对应 tp_iternext 字段），将值迭代出来。 至于 __iter__ 和 __next__ 本身，每个迭代器都会有，我们这里只以列表的迭代器为例。所以这是不是实现了多态呢？ 这就是 Python 的设计哲学，变量只是一个指针，传递变量的时候相当于传递指针（将指针拷贝一份），但操作一个变量的时候会自动操作变量（指针）指向的内存。 以上就是 Python 迭代器的相关内容，当然你也完全可以自己封装一个迭代器，有兴趣可以试一下。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"50. 迭代器是怎么实现的？ » 小结","id":"223","title":"小结"},"224":{"body":"当我们执行一个 py 文件的时候，只需要在命令行中输入 python xxx.py 即可，但你有没有想过这背后的流程是怎样的呢？ 首先 py 文件不是一上来就直接执行的，而是会先有一个编译的过程，整个步骤如下： 这里我们看到了 Python 编译器、Python 虚拟机，而且我们平常还会说 Python 解释器，那么三者之间有什么区别呢？ Python 编译器负责将 Python 源代码编译成 PyCodeObject 对象，然后交给 Python 虚拟机来执行。 那么 Python 编译器和 Python 虚拟机都在什么地方呢？如果打开 Python 的安装目录，会发现有一个 python.exe，点击的时候会通过它来启动一个终端。但问题是这个文件大小还不到 100K，不可能容纳一个编译器加一个虚拟机，所以它下面还有一个 python38.dll。没错，编译器、虚拟机都藏身于 python38.dll 当中。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 楔子","id":"224","title":"楔子"},"225":{"body":"在 Python 开发时，我们肯定都见过这个 pyc 文件，它一般位于 __pycache__ 目录中，那么 pyc 文件和 PyCodeObject 之间有什么关系呢？ 首先我们都知道字节码，虚拟机的执行实际上就是对字节码不断解析的一个过程。然而除了字节码之外，还应该包含一些其它的信息，这些信息也是 Python 运行的时候所必需的，比如常量、变量名等等。 因此我们常听到 py 文件被编译成字节码，这句话其实不太严谨，因为字节码只是一个 PyBytesObject 对象、或者说一段字节序列。但很明显，光有字节码是不够的，还有很多的静态信息也需要被收集起来，它们整体被称为 PyCodeObject，然后 PyCodeObject 对象中有一个字段 co_code，它是一个指针，指向了这段字节序列。但是这个对象除了有指向字节码的 co_code 字段之外，还有很多其它字段，负责保存代码涉及到的常量、变量（名字、符号）等等。 所以虽然编写的是 py 文件，但虚拟机执行的是编译后的 PyCodeObject 对象。但是问题来了，难道每一次执行都要将源文件编译一遍吗？如果没有对源文件进行修改的话，那么完全可以使用上一次的编译结果。相信此时你能猜到 pyc 文件是干什么的了，它就是负责保存编译之后的 PyCodeObject 对象。 现在我们知道了，pyc 文件里面保存的内容是 PyCodeObject 对象。对于 Python 编译器来说，PyCodeObject 对象是对源代码编译之后的结果，而 pyc 文件则是这个对象在硬盘上的表现形式。 当下一次运行的时候，Python 解释器会根据 pyc 文件中记录的编译结果，直接建立内存中的 PyCodeObject 对象，而不需要再重新编译了，当然前提是没有对源文件进行修改。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » pyc 文件是什么","id":"225","title":"pyc 文件是什么"},"226":{"body":"既然 PyCodeObject 对象是源代码的编译结果，那么搞清楚它的底层结构就至关重要，下面来看一下它长什么样子。 // Include/cpython/code.h typedef struct { PyObject_HEAD int co_argcount; int co_posonlyargcount; int co_kwonlyargcount; int co_nlocals; int co_stacksize; int co_flags; int co_firstlineno; PyObject *co_code; PyObject *co_consts; PyObject *co_names; PyObject *co_varnames; PyObject *co_freevars; PyObject *co_cellvars; Py_ssize_t *co_cell2arg; PyObject *co_filename; PyObject *co_name; PyObject *co_lnotab; void *co_zombieframe; PyObject *co_weakreflist; void *co_extra; unsigned char *co_opcache_map; _PyOpcache *co_opcache; int co_opcache_flag; unsigned char co_opcache_size;\n} PyCodeObject; 这里面的每一个字段，我们一会儿都会详细介绍，并通过代码逐一演示。总之 Python 编译器在对源代码进行编译的时候，针对每一个 code block（代码块），都会创建一个 PyCodeObject 与之对应。但多少代码才算得上是一个 block 呢？事实上，Python 有一个简单而清晰的规则：当进入一个新的名字空间，或者说作用域时，就算是进入一个新的 block 了。举个例子： class A: a = 123 def foo(): a = [] 我们仔细观察一下上面这段代码，它在编译完之后会有三个 PyCodeObject 对象，一个是对应整个 py 文件（模块）的，一个是对应 class A 的，一个是对应 def foo 的。因为这是三个不同的作用域，所以会有三个 PyCodeObject 对象。 所以一个 code block 对应一个作用域、同时也对应一个 PyCodeObject 对象。Python 的类、函数、模块都有自己独立的作用域，因此在编译时也都会有一个 PyCodeObject 对象与之对应。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 底层结构","id":"226","title":"PyCodeObject 底层结构"},"227":{"body":"PyCodeObject 我们知道它是干什么的了，那如何才能拿到这个对象呢？首先该对象在 Python 里面的类型是 <class 'code'>，但是底层没有将这个类暴露给我们，因此 code 这个名字在 Python 里面只是一个没有定义的变量罢了。 但我们可以通过其它的方式进行获取，比如函数。 def func(): pass print(func.__code__) # <code object ......\nprint(type(func.__code__)) # <class 'code'> 我们可以通过函数的 __code__ 属性拿到底层对应的 PyCodeObject 对象，当然也可以获取里面的字段，下面就来演示一下，并详细介绍每个字段的含义。 PyObject_HEAD：对象的头部信息 我们看到 Python 真的一切皆对象，源代码编译之后的结果也是一个对象。 co_argcount：可以通过位置参数传递的参数个数 def foo(a, b, c=3): pass\nprint(foo.__code__.co_argcount) # 3 def bar(a, b, *args): pass\nprint(bar.__code__.co_argcount) # 2 def func(a, b, *args, c): pass\nprint(func.__code__.co_argcount) # 2 函数 foo 中的参数 a、b、c 都可以通过位置参数传递，所以结果是 3。而函数 bar 则是两个，这里不包括 *args。最后函数 func 显然也是两个，因为参数 c 只能通过关键字参数传递。 co_posonlyargcount：只能通过位置参数传递的参数个数，Python3.8 新增 def foo(a, b, c): pass\nprint(foo.__code__.co_posonlyargcount) # 0 def bar(a, b, /, c): pass\nprint(bar.__code__.co_posonlyargcount) # 2 注意：这里是只能通过位置参数传递的参数个数。对于 foo 而言，里面的三个参数既可以通过位置参数、也可以通过关键字参数传递，所以个数是 0。而函数 bar，里面的 a、b 只能通过位置参数传递，所以个数是 2。 co_kwonlyargcount：只能通过关键字参数传递的参数个数 def foo(a, b=1, c=2, *, d, e): pass\nprint(foo.__code__.co_kwonlyargcount) # 2 这里是 d 和 e，它们必须通过关键字参数传递。 co_nlocals：代码块中局部变量的个数，也包括参数 def foo(a, b, *args, c, **kwargs): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'args', 'kwargs', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_nlocals)\n\"\"\"\n8\n\"\"\" co_varnames 保存的是代码块的局部变量，显然 co_nlocals 就是它的长度。并且我们看到在编译之后，函数的局部变量就已经确定了，因为它们是静态存储的。 co_stacksize：执行该段代码块所需要的栈空间 def foo(a, b, c): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_stacksize) # 1 这个暂时不需要太关注，后续介绍栈帧的时候会详细说明。 co_flags：函数标识 先来提出一个问题： def some_func(): return \"hello world\" def some_gen(): yield return \"hello world\" print(some_func.__class__)\nprint(some_gen.__class__)\n\"\"\"\n<class 'function'>\n<class 'function'>\n\"\"\" print(some_func())\n\"\"\"\nhello world\n\"\"\"\nprint(some_gen())\n\"\"\"\n<generator object some_gen at 0x1028a80b0>\n\"\"\" 调用 some_func 会将代码执行完毕，调用 some_gen 会返回生成器，但问题是这两者都是函数类型，为什么执行的时候会有不同的表现呢？可能有人觉得这还不简单，Python 具有词法作用域，由于 some_func 里面没有出现 yield 关键字，所以是普通函数，而 some_gen 里面出现了 yield，所以是生成器函数。 从源代码来看确实如此，但源代码是要编译成 PyCodeObject 对象的，在编译之后，函数内部是否出现 yield 关键字这一信息要怎么体现呢？答案便是通过 co_flags 字段。 然后解释器内部定义了一系列的标志位，通过和 co_flags 字段按位与，便可判断函数是否具备指定特征。常见的标志位如下： // Include/code.h // 函数参数是否包含 *args\n#define CO_VARARGS 0x0004\n// 函数参数是否包含 **kwargs\n#define CO_VARKEYWORDS 0x0008\n// 函数是否是内层函数\n#define CO_NESTED 0x0010\n// 函数是否是生成器函数\n#define CO_GENERATOR 0x0020\n// 函数是否是协程函数\n#define CO_COROUTINE 0x0080\n// 函数是否是异步生成器函数\n#define CO_ASYNC_GENERATOR 0x0200 我们实际测试一下，比如检测函数的参数类型： CO_VARARGS = 0x0004\nCO_VARKEYWORDS = 0x0008\nCO_NESTED = 0x0010 def foo(*args): pass def bar(): pass # 因为 foo 的参数包含 *args，所以和 CO_VARARGS 按位与的结果为真\n# 而 bar 的参数不包含 *args，所以结果为假\nprint(foo.__code__.co_flags & CO_VARARGS) # 4\nprint(bar.__code__.co_flags & CO_VARARGS) # 0 def foo(**kwargs): pass def bar(): pass print(foo.__code__.co_flags & CO_VARKEYWORDS) # 8\nprint(bar.__code__.co_flags & CO_VARKEYWORDS) # 0 def foo(): def bar(): pass return bar # foo 是外层函数，所以和 CO_NESTED 按位与的结果为假\n# foo() 返回的是内层函数，所以和 CO_NESTED 按位与的结果为真\nprint(foo.__code__.co_flags & CO_NESTED) # 0\nprint(foo().__code__.co_flags & CO_NESTED) # 16 当然啦，co_flags 还可以检测一个函数的类型。比如函数内部出现了 yield，那么它就是一个生成器函数，调用之后会得到一个生成器；使用 async def 定义，那么它就是一个协程函数，调用之后会得到一个协程。 这些在词法分析的时候就可以检测出来，编译之后会体现在 co_flags 字段中。 CO_GENERATOR = 0x0020\nCO_COROUTINE = 0x0080\nCO_ASYNC_GENERATOR = 0x0200 # 如果是生成器函数，那么 co_flags & 0x20 为真\ndef foo1(): yield\nprint(foo1.__code__.co_flags & 0x20) # 32 # 如果是协程函数，那么 co_flags & 0x80 为真\nasync def foo2(): pass\nprint(foo2.__code__.co_flags & 0x80) # 128\n# 显然 foo2 不是生成器函数，所以 co_flags & 0x20 为假\nprint(foo2.__code__.co_flags & 0x20) # 0 # 如果是异步生成器函数，那么 co_flags & 0x200 为真\nasync def foo3(): yield\nprint(foo3.__code__.co_flags & 0x200) # 512\n# 显然它不是生成器函数、也不是协程函数\n# 因此和 0x20、0x80 按位与之后，结果都为假\nprint(foo3.__code__.co_flags & 0x20) # 0\nprint(foo3.__code__.co_flags & 0x80) # 0 在判断函数种类时，这种方式是最优雅的。 co_firstlineno：代码块的起始位置在源文件中的哪一行 def foo(a, b, c): pass # 显然是文件的第一行\n# 或者理解为 def 所在的行\nprint(foo.__code__.co_firstlineno) # 1 如果函数出现了调用呢？ def foo(): return bar def bar(): pass print(foo().__code__.co_firstlineno) # 4 如果执行 foo，那么会返回函数 bar，因此结果是 def bar(): 所在的行数。所以每个函数都有自己的作用域，以及 PyCodeObject 对象。 co_code：指令集，也就是字节码，它是一个 bytes 对象 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 字节码，一个 bytes 对象，它保存了要操作的指令\n# 但光有字节码是肯定不够的，还需要其它的静态信息\n# 显然这些信息连同字节码一样，都位于 PyCodeObject 中\nprint(foo.__code__.co_code)\n\"\"\"\nb'd\\x01}\\x03d\\x02}\\x04d\\x03}\\x05t\\x00|\\x03|\\x04|\\x05\\x83\\x03\\x01\\x00d\\x00S\\x00'\n\"\"\" co_consts：常量池，一个元组，保存代码块中创建的所有常量 def foo(): a = 122 + 1 b = \"hello\" c = (1, 2) d = [\"x\", \"y\"] e = {\"p\": \"k\"} f = {7, 8} print(foo.__code__.co_consts)\n\"\"\"\n(None, 123, 'hello', (1, 2), 'x', 'y', 'p', 'k', 7, 8)\n\"\"\" co_consts 里面出现的都是编译阶段可以确定的常量，而 [\"x\", \"y\"] 和 {\"p\": \"k\"} 没有出现，由此我们可以得出，列表和字典绝不是在编译阶段构建的。编译时，只是收集了里面的元素，然后等到运行时再去动态构建。 不过问题来了，在构建的时候解释器怎么知道是要构建列表、还是字典、亦或是其它的什么对象呢？所以这就依赖于字节码了，解释字节码的时候，会判断到底要构建什么样的对象。因此解释器执行的是字节码，核心逻辑都体现在字节码中，但是光有字节码还不够，它包含的只是程序的主干逻辑，至于变量、常量，则从符号表和常量池里面获取。 另外函数里面的变量 a 等于 122 + 1，但常量池里面却存储了 123，这个过程叫做常量折叠。常量之间的加减乘除，结果依旧是一个常量，编译阶段就会计算好。 co_names：符号表，一个元组，保存代码块中引用的其它作用域的变量 c = 1 def foo(a, b): print(a, b, c) d = (list, int, str) print(foo.__code__.co_names)\n\"\"\"\n('print', 'c', 'list', 'int', 'str')\n\"\"\" 虽然一切皆对象，但看到的都是指向对象的变量，所以 print, c, list, int, str 都是变量，它们都不在当前 foo 函数的作用域中。 co_varnames：符号表，一个元组，保存当前作用域中创建的局部变量 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 当前作用域中创建的变量，注意它和 co_names 的区别\n# co_varnames 保存的是当前作用域中创建的局部变量\n# 而 co_names 保存的是当前作用域中引用的其它作用域的变量\nprint(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_varnames)\n\"\"\"\n('print',)\n\"\"\" co_cellvars：一个元组，保存外层函数的作用域中被内层函数引用的变量 co_freevars：一个元组，保存内层函数引用的外层函数的作用域中的变量 def foo(a, b, c): def bar(): print(a, b, c) return bar # co_cellvars：外层函数的作用域中被内层函数引用的变量\n# co_freevars：内层函数引用的外层函数的作用域中的变量\nprint(foo.__code__.co_cellvars)\nprint(foo.__code__.co_freevars)\n\"\"\"\n('a', 'b', 'c')\n()\n\"\"\"\n# foo 里面的变量 a、b、c 被内层函数 bar 引用了\n# 所以它的 co_cellvars 是 ('a', 'b', 'c')\n# 而 foo 不是内层函数，所以它的 co_freevars 是 () bar = foo(1, 2, 3)\nprint(bar.__code__.co_cellvars)\nprint(bar.__code__.co_freevars)\n\"\"\"\n()\n('a', 'b', 'c')\n\"\"\"\n# bar 引用了外层函数 foo 里面的变量 a、b、c\n# 所以它的 co_freevars 是 ('a', 'b', 'c')\n# 而 bar 已经是最内层函数了，所以它的 co_cellvars 是 () 当然目前的函数只嵌套了两层，但嵌套三层甚至更多层也是一样的。 def foo(a, b, c): def bar(d, e): print(a) def func(): print(b, c, d, e) return func return bar # 对于 foo 而言，它的内层函数就是 bar\n# 至于最里面的 func，由于定义在 bar 的内部，因此可以看做是 bar 函数体的一部分\n# 而 foo 里面的变量 a、b、c 都被内层函数引用了\nprint(foo.__code__.co_cellvars) # ('a', 'b', 'c')\nprint(foo.__code__.co_freevars) # () bar = foo(1, 2, 3)\n# 对于函数 bar 而言，它的内层函数就是 func\n# 而显然 bar 里面的变量 d 和 e 被 func 引用了\nprint(bar.__code__.co_cellvars) # ('d', 'e')\n# 然后 bar 引用了外层函数 foo 里面的 a、b、c\nprint(bar.__code__.co_freevars) # ('a', 'b', 'c')\n# 所以 co_cellvars 和 co_freevars 这两个字段的关系有点类似镜像 co_cellvars 和 co_freevars 在后续介绍闭包的时候会用到。 co_filename：代码块所在的文件的路径 # 文件名：main.py\ndef foo(): pass print(foo.__code__.co_filename)\n\"\"\"\n/Users/satori/Documents/testing_project/main.py\n\"\"\" 如果你无法使用 IDE，那么便可通过该字段查看函数定义在哪个文件中。 co_name：代码块的名字 def foo(): pass print(foo.__code__.co_name) # foo 对于函数来说，代码块的名字就是函数名。 co_lnotab：负责存储指令的偏移量和源代码行号之间的对应关系 PyCodeObject 是源代码编译之后的产物，虽然两者的结构千差万别，但体现出的信息是一致的。像源代码具有行号，那么编译成 PyCodeObject 之后，行号信息也应该要有专门的字段来维护，否则报错时我们就无法快速定位到行号。 def foo(): name = \"古明地觉\" hobby = ( \"sing\", \"dance\", \"rap\", \"🏀\" ) age = 16 我们通过 dis 模块反编译一下。 第一列数字表示行号，第二列数字表示字节码指令的偏移量，或者说指令在整个字节码指令集中的索引。我们知道字节码指令集就是一段字节序列，由 co_code 字段维护，并且每个指令都带有一个参数，所以偏移量（索引）为 0 2 4 6 8 ··· 的字节表示指令，偏移量为 1 3 5 7 9 ··· 的字节表示参数。 关于反编译的具体细节后续会说，总之一个字节码指令就是一个八位整数。对于当前函数来说，它的字节码偏移量和行号的对应关系如下： 偏移量和源代码行号的对应关系便由 co_lnotab（一个字节序列）维护，只不过 co_lnotab 并没有直接记录这些信息，而是记录的增量值。 (0, 1) 到 (0, 2)：偏移量增加 0，行号增加 1； (0, 2) 到 (4, 3)：偏移量增加 4，行号增加 1； (4, 3) 到 (8, 9)：偏移量增加 4，行号增加 6； 所以 co_lnotab 便是 0 1 4 1 4 6，我们验证一下。 结果和我们分析的一样。 以上就是 PyCodeObject 里面的字段的含义，至于剩下的几个字段就无需关注了。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 字段解析","id":"227","title":"PyCodeObject 字段解析"},"228":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机。 编译器先将 .py 源码文件编译成 PyCodeObject 对象，然后再交给虚拟机执行。 PyCodeObject 对象可以认为是源码文件的另一种等价形式，但经过编译，虚拟机可以更快速地执行。 为了避免每次都要对源文件进行编译，因此编译后的结果会序列化在 .pyc 文件中，如果源文件没有做改动，那么下一次执行时会直接从 .pyc 文件中读取。 Python 的函数、类、模块等，都具有各自的作用域，每个作用域对应一个独立的代码块，在编译时，Python 编译器会为每个代码块都创建一个 PyCodeObject 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 小结","id":"228","title":"小结"},"229":{"body":"上一篇文章我们介绍了 PyCodeObject 对象，但是还遗漏了一些内容，这里再单独补充一下。","breadcrumbs":"52. PyCodeObject 拾遗 » 楔子","id":"229","title":"楔子"},"23":{"body":"type 是所有类型对象的类型，我们称之为元类型或者元类，即 metaclass，当然它同时也是一个类型对象。下面看一下它的底层实现。 // Objects/typeobject.c PyTypeObject PyType_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"type\", /* tp_name */ sizeof(PyHeapTypeObject), /* tp_basicsize */ sizeof(PyMemberDef), /* tp_itemsize */ (destructor)type_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ (reprfunc)type_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ (ternaryfunc)type_call, /* tp_call */ // ...\n}; 所有的类型对象加上元类都是由 PyTypeObject 这个结构体实例化得到的，所以它们内部的字段都是一样的。只不过传入的值不同，实例化之后得到的结果也不同，可以是 PyLong_Type、可以是 PyFloat_Type，也可以是这里的 PyType_Type。 再看一下里面的宏 PyVarObject_HEAD_INIT，它用来初始化引用计数、类型和 ob_size，其中类型被初始化成了 &PyType_Type。换句话说，PyType_Type 里面的 ob_type 字段指向的还是 PyType_Type，而对应 Python 的话，就是 type 的类型还是 type。 >>> type.__class__\n<class 'type'>\n>>> type.__class__.__class__.__class__.__class__.__class__ is type\nTrue\n>>> type(type(type(type(type(type))))) is type\nTrue 显然不管套娃多少次，最终的结果都是 True，这也是符合预期的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的类型：PyType_Type","id":"23","title":"类型对象的类型：PyType_Type"},"230":{"body":"之前通过函数的 __code__ 属性获取了该函数的 PyCodeObject 对象，但是还有没有其它的方法呢？显然是有的，答案是通过内置函数 compile，不过在介绍 compile 之前，先介绍一下 eval 和 exec。 eval：传入一个字符串，然后把字符串里面的内容当做表达式。 a = 1\n# 所以 eval(\"a\") 就等价于 a\nprint(eval(\"a\")) # 1\nprint(eval(\"1 + 1 + 1\")) # 3 注意：eval 是有返回值的，返回值就是字符串里面的内容。所以 eval 接收的字符串里面一定是一个表达式，表达式计算之后是一个具体的值，比如 a = eval(\"1 + 2\")，等价于 a = 3。 但如果是语句的话，比如 a = eval(\"b = 3\")，这样等价于 a = (b = 3)，显然这会出现语法错误。因此 eval 函数把字符串两边的引号剥掉之后，得到的一定是一个普通的值。 try: print(eval(\"xxx\"))\nexcept NameError as e: print(e) # name 'xxx' is not defined 此时等价于 print(xxx)，但是 xxx 没有定义，所以报错。 # 此时是合法的，等价于 print('xxx')\nprint(eval(\"'xxx'\")) # xxx 以上就是 eval 函数，使用起来还是很方便的。 exec：传入一个字符串，把字符串里面的内容当成语句来执行，这个是没有返回值的，或者说返回值是 None。 # 相当于 a = 1\nexec(\"a = 1\") print(a) # 1 statement = \"\"\"\na = 123\nif a == 123: print(\"a 等于 123\")\nelse: print(\"a 不等于 123\")\n\"\"\"\nexec(statement) # a 等于 123 注意：a 等于 123 并不是 exec 返回的，而是把上面那坨字符串当成普通代码执行的时候 print 出来的。这便是 exec 的作用，将字符串当成语句来执行。 所以使用 exec 可以非常方便地创建多个变量。 import random for i in range(1, 5): exec(f\"a{i} = {random.randint(1, 100)}\") print(a1) # 72\nprint(a2) # 21\nprint(a3) # 38\nprint(a4) # 32 那么 exec 和 eval 的区别就显而易见了，eval 是要求字符串里面的内容能够当成一个值，并且该值就是 eval 函数的返回值。而 exec 则是直接执行里面的内容，返回值是 None。 print(eval(\"1 + 1\")) # 2\nprint(exec(\"1 + 1\")) # None # 相当于 a = 2\nexec(\"a = 1 + 1\")\nprint(a) # 2 try: # 相当于 a = 2，但很明显 a = 2 是一个语句 # 它无法作为一个值，因此放到 eval 里面就报错了 eval(\"a = 1 + 1\")\nexcept SyntaxError as e: print(e) # invalid syntax (<string>, line 1) 还是很好区分的，但是 eval 和 exec 在生产中尽量要少用。另外，eval 和 exec 还可以接收第二个参数和第三个参数，我们在介绍名字空间的时候再说。 compile：关键来了，它执行后返回的就是一个 PyCodeObject 对象。 这个函数接收哪些参数呢？ 参数一：当成代码执行的字符串 参数二：可以为这些代码起一个文件名 参数三：执行方式，支持三种，分别是 exec、single、eval 我们演示一下。 # exec：将源代码当做一个模块来编译\n# single：用于编译一个单独的 Python 语句（交互式）\n# eval：用于编译一个 eval 表达式\nstatement = \"a, b = 1, 2\"\n# 这里我们选择 exec，当成一个模块来编译\nco = compile(statement, \"古明地觉的编程教室\", \"exec\") print(co.co_firstlineno) # 1\nprint(co.co_filename) # 古明地觉的编程教室\nprint(co.co_argcount) # 0\n# 我们是以 a, b = 1, 2 这种方式赋值\n# 所以 (1, 2) 会被当成一个元组加载进来\n# 因此从这里可以看出，元组在编译阶段就已经确定好了\nprint(co.co_consts) # ((1, 2), None) statement = \"\"\"\na = 1\nb = 2\n\"\"\"\nco = compile(statement, \"<file>\", \"exec\")\nprint(co.co_consts) # (1, 2, None)\nprint(co.co_names) # ('a', 'b') 我们后面在分析 PyCodeObject 的时候，会经常使用 compile 函数。 然后 compile 还可以接收一个 flags 参数，也就是第四个参数，它的默认值为 0，表示按照标准模式进行编译，就是之前说的那几步。 对文本形式的源代码进行分词，将其切分成一个个的 Token； 对 Token 进行语法解析，生成抽象语法树（AST）； 将 AST 编译成 PyCodeObject 对象，简称 code 对象或者代码对象； 但如果将 flags 指定为 1024，那么 compile 函数在生成 AST 之后会直接停止，然后返回一个 _ast.Module 对象。 print( compile(\"a = 1\", \"<file>\", \"exec\").__class__\n) # <class 'code'> print( compile(\"a = 1\", \"<file>\", \"exec\", flags=1024).__class__\n) # <class '_ast.Module'> _ast 模块是和 Python 的抽象语法树相关的，那么问题来了，这个 _ast.Module 对象能够干什么呢？别着急，我们后续在介绍栈帧的时候说。不过由于抽象语法树比较底层，因此知道 compile 的前三个参数的用法即可。","breadcrumbs":"52. PyCodeObject 拾遗 » 内置函数 compile","id":"230","title":"内置函数 compile"},"231":{"body":"关于 Python 的字节码，是后面剖析虚拟机的重点，现在先来看一下。我们知道执行源代码之前会先编译得到 PyCodeObject 对象，里面的 co_code 字段指向了字节码序列，或者说字节码指令集。 虚拟机会根据这些指令集来进行一系列的操作（当然也依赖其它的静态信息），从而完成对程序的执行。关于指令，解释器定义了 100 多种，我们大致看一下。 // Include/opcode.h\n#define POP_TOP 1\n#define ROT_TWO 2\n#define ROT_THREE 3\n#define DUP_TOP 4\n#define DUP_TOP_TWO 5\n#define ROT_FOUR 6\n#define NOP 9\n#define UNARY_POSITIVE 10\n#define UNARY_NEGATIVE 11\n#define UNARY_NOT 12\n#define UNARY_INVERT 15\n#define BINARY_MATRIX_MULTIPLY 16\n#define INPLACE_MATRIX_MULTIPLY 17\n#define BINARY_POWER 19\n#define BINARY_MULTIPLY 20\n#define BINARY_MODULO 22\n#define BINARY_ADD 23\n#define BINARY_SUBTRACT 24\n#define BINARY_SUBSCR 25\n#define BINARY_FLOOR_DIVIDE 26\n#define BINARY_TRUE_DIVIDE 27\n#define INPLACE_FLOOR_DIVIDE 28\n#define INPLACE_TRUE_DIVIDE 29\n#define GET_AITER 50\n#define GET_ANEXT 51\n#define BEFORE_ASYNC_WITH 52\n#define BEGIN_FINALLY 53\n#define END_ASYNC_FOR 54\n#define INPLACE_ADD 55\n#define INPLACE_SUBTRACT 56\n#define INPLACE_MULTIPLY 57\n#define INPLACE_MODULO 59\n#define STORE_SUBSCR 60\n#define DELETE_SUBSCR 61\n#define BINARY_LSHIFT 62\n#define BINARY_RSHIFT 63\n#define BINARY_AND 64\n#define BINARY_XOR 65\n#define BINARY_OR 66\n#define INPLACE_POWER 67\n#define GET_ITER 68\n#define GET_YIELD_FROM_ITER 69\n#define PRINT_EXPR 70\n#define LOAD_BUILD_CLASS 71\n#define YIELD_FROM 72\n#define GET_AWAITABLE 73\n#define INPLACE_LSHIFT 75\n#define INPLACE_RSHIFT 76\n// ... 所谓字节码指令其实就是个整数，多个指令组合在一起便是字节码指令集（字节码序列），它是一个 bytes 对象。当然啦，指令集里面不全是指令，索引（偏移量）为偶数的字节表示指令，索引为奇数的字节表示指令参数，后续会细说。 然后我们可以通过反编译的方式查看每行 Python 代码都对应哪些操作指令。 # Python 的 dis 模块专门负责干这件事情\nimport dis def foo(a, b): c = a + b return c # 里面接收 PyCodeObject 对象\n# 当然函数也是可以的，会自动获取 co_code\ndis.dis(foo)\n\"\"\" 2 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 BINARY_ADD 6 STORE_FAST 2 (c) 3 8 LOAD_FAST 2 (c) 10 RETURN_VALUE\n\"\"\" 字节码反编译后的结果多么像汇编语言，其中第一列是源代码行号，第二列是字节码偏移量，第三列是字节码指令（也叫操作码），第四列是指令参数（也叫操作数）。Python 的字节码指令都是成对出现的，每个指令会带有一个指令参数。 另外查看字节码也可以使用 opcode 模块： from opcode import opmap opmap = {v: k for k, v in opmap.items()} def foo(a, b): c = a + b return c code = foo.__code__.co_code\nfor i in range(0, len(code), 2): print(\"操作码: {:<12} 操作数: {}\".format( opmap[code[i]], code[i+1] ))\n\"\"\"\n操作码: LOAD_FAST 操作数: 0\n操作码: LOAD_FAST 操作数: 1\n操作码: BINARY_ADD 操作数: 0\n操作码: STORE_FAST 操作数: 2\n操作码: LOAD_FAST 操作数: 2\n操作码: RETURN_VALUE 操作数: 0\n\"\"\" 总之字节码就是一段字节序列，转成列表之后就是一堆数字。偶数位置表示指令本身，而每个指令后面都会跟一个指令参数，也就是奇数位置表示指令参数。 所以指令本质上只是一个整数，而虚拟机会根据不同的指令执行不同的逻辑。说白了 Python 虚拟机执行字节码的逻辑就是把自己想象成一颗 CPU，并内置了一个巨型的 switch case 语句，其中每个指令都对应一个 case 分支。然后遍历整条字节码，拿到每一个指令和指令参数。接着对指令进行判断，不同的指令进入不同的 case 分支，执行不同的处理逻辑，直到字节码全部执行完毕或者程序出错。 关于执行字节码的具体流程，等介绍栈帧的时候细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"52. PyCodeObject 拾遗 » 字节码与反编译","id":"231","title":"字节码与反编译"},"232":{"body":"上一篇文章我们介绍了字节码，当时提到，py 文件在执行的时候会先被编译成 PyCodeObject 对象，并且该对象还会被保存到 pyc 文件中。 然而事实并不总是这样，有时当我们运行一个简单的程序时，并没有产生 pyc 文件。因此我们猜测：有些 Python 程序只是临时完成一些琐碎的工作，这样的程序仅仅只会运行一次，然后就不会再使用了，因此也就没有保存至 pyc 文件的必要。 如果我们在代码中加上了一个 import abc 这样的语句，再执行你就会发现解释器为 abc.py 生成了 pyc 文件，这就说明 import 语句会触发 pyc 的生成。 实际上，在运行过程中，如果碰到 import abc 这样的语句，那么 Python 会在设定好的 path 中寻找 abc.pyc 或者 abc.pyd 文件。但如果没有这些文件，而是只发现了 abc.py，那么会先将 abc.py 编译成 PyCodeObject，然后写入到 pyc 文件中。 接下来，再对 abc.pyc 进行 import 动作。对的，并不是编译成 PyCodeObject 对象之后就直接使用，而是先写到 pyc 文件里，然后再将 pyc 文件里面的 PyCodeObject 对象重新在内存中复制出来。 当然啦，触发 pyc 文件生成不仅可以通过 import，还可以通过 py_compile 模块手动生成。比如当前有一个 tools.py，代码如下。 a = 1\nb = \"你好啊\" 如何将其编译成 pyc 呢？ import py_compile py_compile.compile(\"tools.py\") 查看当前目录的 __pycache__ 目录，会发现 pyc 已经生成了。 py文件名.cpython-版本号.pyc 便是编译之后的 pyc 文件名。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的触发","id":"232","title":"pyc 文件的触发"},"233":{"body":"如果有一个现成的 pyc 文件，我们要如何导入它呢？ from importlib.machinery import SourcelessFileLoader tools = SourcelessFileLoader( \"tools\", \"__pycache__/tools.cpython-38.pyc\"\n).load_module() print(tools.a) # 1\nprint(tools.b) # 你好啊 以上我们就成功手动导入了 pyc 文件。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的导入","id":"233","title":"pyc 文件的导入"},"234":{"body":"pyc 文件在创建的时候都会往里面写入哪些内容呢？ 1）magic number 这是解释器内部定义的一个值，不同版本的解释器会定义不同的 magic number，这个值是为了保证能够加载正确的 pyc，比如 Python3.8 不会加载 3.7 版本的 pyc。因为解释器在加载 pyc 文件的时候会检测该 pyc 的 magic number，如果和自身的 magic number 不一致，说明此 pyc 是由其它版本的解释器写入的，因此拒绝加载。 from importlib.util import MAGIC_NUMBER\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: magic_number = f.read(4)\nprint(magic_number) # b'U\\r\\r\\n' pyc 文件的前 4 个字节便是 magic number。 2）py 文件的最后修改时间 这个很好理解，在加载 pyc 的时候会比较源代码的实际修改时间和 pyc 文件中存储的修改时间。如果两者不相等，说明在生成 pyc 之后，源代码又被修改了，那么会重新编译并写入 pyc，而反之则会直接加载已存在的 pyc。 3）py 文件的大小 py 文件的大小也会被记录在 pyc 文件中。 4）PyCodeObject 对象 编译之后的 PyCodeObject 对象，这个不用说了，肯定是要存储的，并且是序列化之后再存储。 因此 pyc 文件的结构如下： 我们实际验证一下： import struct\nfrom importlib.util import MAGIC_NUMBER\nfrom datetime import datetime with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 0 ~ 4 字节是 MAGIC NUMBER\nprint(data[: 4]) # b'U\\r\\r\\n'\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' # 4 ~ 8 字节是 4 个 \\x00\nprint(data[4: 8]) # b'\\x00\\x00\\x00\\x00' # 8 ~ 12 字节是 py 文件的最后修改时间（小端存储），一个时间戳\nts = struct.unpack(\"<I\", data[8: 12])[0]\nprint(ts) # 1734595934\nprint(datetime.fromtimestamp(ts)) # 2024-12-19 08:12:14 # 12 ~ 16 字节是 py 文件的大小\nprint(struct.unpack(\"<I\", data[12: 16])[0]) # 22 那么实际的 tools.py 是不是这样呢？我们查看一下。 结果没有问题，实际大小是 22 字节，和 pyc 文件记录的一样。然后是最后修改时间，由于在生成 pyc 之后，没有对源文件做修改，所以它的最后修改时间和 pyc 文件记录的一样，都是 08:12。但如果我们再对 tools.py 做修改的话，那么它的最后修改时间和 pyc 文件记录的就不一样了，此时如果再导入 tools.py 就会重新编译生成 pyc，并写入新的最后修改时间。 以上就是 pyc 文件的前 16 个字节，而 16 个字节往后就是 PyCodeObject 对象，并且是序列化之后的，因为该对象显然无法直接存在文件中。 import marshal with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 通过 marshal.loads 可以反序列化\n# marshal.dumps 则表示序列化\ncode = marshal.loads(data[16:])\n# 此时就拿到了 py 文件编译之后的 PyCodeObject\nprint(code)\n\"\"\"\n<code object <module> at 0x..., file \"tools.py\", line 1>\n\"\"\"\n# 查看常量池\nprint(code.co_consts) # (1, '你好啊', None) # 符号表\nprint(code.co_names) # ('a', 'b') 常量池和符号表都是正确的。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件都包含哪些内容","id":"234","title":"pyc 文件都包含哪些内容"},"235":{"body":"下面通过源码来查看 pyc 文件的写入过程，既然要写入，那么肯定要有文件句柄。 // Python/marshal.c // FILE 是 C 自带的文件句柄\n// 可以把 WFILE 看成是 FILE 的包装\ntypedef struct { FILE *fp; // 下面的字段在写入数据的时候会看到 int error; int depth; PyObject *str; char *ptr; char *end; char *buf; _Py_hashtable_t *hashtable; int version;\n} WFILE; 首先是写入 magic number、创建时间和文件大小，它们会调用 PyMarshal_WriteLongToFile 函数进行写入： // Python/marshal.c\nvoid\nPyMarshal_WriteLongToFile(long x, FILE *fp, int version)\n{ // magic number、创建时间和文件大小，只是一个 4 字节整数 // 因此使用 char[4] 来保存 char buf[4]; // 声明一个 WFILE 类型的变量 wf WFILE wf; // 内存初始化 memset(&wf, 0, sizeof(wf)); // 初始化内部字段 wf.fp = fp; // 文件句柄 wf.ptr = wf.buf = buf; // buf 数组首元素的地址 wf.end = wf.ptr + sizeof(buf); // buf 数组尾元素的地址 wf.error = WFERR_OK; wf.version = version; // 调用 w_long 将信息写到 wf 里面 // 写入的信息可以是 magic number、时间和文件大小 w_long(x, &wf); // 刷到磁盘上 w_flush(&wf);\n} 所以该函数只是初始化了一个 WFILE 对象，真正写入则是调用的 w_long。 // Python/marshal.c\nstatic void\nw_long(long x, WFILE *p)\n{ w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); w_byte((char)((x>>16) & 0xff), p); w_byte((char)((x>>24) & 0xff), p);\n} w_long 则是调用 w_byte 将 x 逐个字节地写到文件里面去。 当头信息写完之后，就该写 PyCodeObject 对象了，这个过程由 PyMarshal_WriteObjectToFile 函数负责。 // Python/marshal.c\nvoid\nPyMarshal_WriteObjectToFile(PyObject *x, FILE *fp, int version)\n{ char buf[BUFSIZ]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; if (w_init_refs(&wf, version)) return; /* caller mush check PyErr_Occurred() */ // 写入头信息由 PyMarshal_WriteLongToFile 负责，它内部会调用 w_long // 写入 PyCodeObject 由当前函数负责，它内部会调用 w_object w_object(x, &wf); w_clear_refs(&wf); w_flush(&wf);\n} 然后我们看一下 w_object 函数。 // Python/marshal.c\nstatic void\nw_object(PyObject *v, WFILE *p)\n{ char flag = '\\0'; p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->error = WFERR_NESTEDTOODEEP; } else if (v == NULL) { w_byte(TYPE_NULL, p); } else if (v == Py_None) { w_byte(TYPE_NONE, p); } else if (v == PyExc_StopIteration) { w_byte(TYPE_STOPITER, p); } else if (v == Py_Ellipsis) { w_byte(TYPE_ELLIPSIS, p); } else if (v == Py_False) { w_byte(TYPE_FALSE, p); } else if (v == Py_True) { w_byte(TYPE_TRUE, p); } else if (!w_ref(v, &flag, p)) w_complex_object(v, flag, p); p->depth--;\n} 可以看到 w_object 和 w_long 一样，本质上都是调用了 w_byte。当然 w_byte 只能写入一些简单数据，如果是列表、字典之类的数据，那么会调用 w_complex_object 函数，也就是代码中的最后一个 else if 分支。 w_complex_object 这个函数的源代码很长，我们看一下整体结构，具体逻辑就不贴了，后面会单独截取一部分进行分析。 // Python/marshal.c static void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ Py_ssize_t i, n; // 如果是整数，执行整数的写入逻辑 if (PyLong_CheckExact(v)) { // ... } // 如果是浮点数，执行浮点数的写入逻辑 else if (PyFloat_CheckExact(v)) { // ... } // 如果是复数，执行复数的写入逻辑 else if (PyComplex_CheckExact(v)) { // ... } // 如果是字节序列，执行字节序列的写入逻辑 else if (PyBytes_CheckExact(v)) { // ... } // 如果是字符串，执行字符串的写入逻辑 else if (PyUnicode_CheckExact(v)) { // ... } // 如果是元组，执行元组的写入逻辑 else if (PyTuple_CheckExact(v)) { // ... } // 如果是列表，执行列表的写入逻辑 else if (PyList_CheckExact(v)) { // ... } // 如果是字典，执行字典的写入逻辑 else if (PyDict_CheckExact(v)) { // ... } // 如果是集合，执行集合的写入逻辑 else if (PyAnySet_CheckExact(v)) { // ... } // 如果是 PyCodeObject 对象，执行 PyCodeObject 对象的写入逻辑 else if (PyCode_Check(v)) { // ... } // 如果是 Buffer，执行 Buffer 的写入逻辑 else if (PyObject_CheckBuffer(v)) { // ... } else { W_TYPE(TYPE_UNKNOWN, p); p->error = WFERR_UNMARSHALLABLE; }\n} 源代码虽然长，但是逻辑非常单纯，就是对不同的对象、执行不同的写动作，然而其最终目的都是通过 w_byte 写到 pyc 文件中。了解完函数的整体结构之后，我们再看一下具体细节，看看它在写入对象的时候到底写入了哪些内容？ // Python/marshal.c\nstatic void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ // ...... else if (PyList_CheckExact(v)) { W_TYPE(TYPE_LIST, p); n = PyList_GET_SIZE(v); W_SIZE(n, p); for (i = 0; i < n; i++) { w_object(PyList_GET_ITEM(v, i), p); } } else if (PyDict_CheckExact(v)) { Py_ssize_t pos; PyObject *key, *value; W_TYPE(TYPE_DICT, p); /* This one is NULL object terminated! */ pos = 0; while (PyDict_Next(v, &pos, &key, &value)) { w_object(key, p); w_object(value, p); } w_object((PyObject *)NULL, p); } // ......\n} 以列表和字典为例，它们在写入的时候实际上写的是内部的元素，其它对象也是类似的。 def foo(): lst = [1, 2, 3] # 把列表内的元素写进去了\nprint( foo.__code__.co_consts\n) # (None, 1, 2, 3) 但很明显，如果只是将元素收集起来显然是不够的，否则 Python 在加载的时候怎么知道它是一个列表呢？所以在写入的时候不能光写数据，还要将类型信息也写进去。我们再看一下上面列表和字典的写入逻辑，里面都调用了 W_TYPE，它负责写入类型信息。 因此无论对于哪种对象，在写入具体数据之前，都会先调用 W_TYPE 将类型信息写进去。如果没有类型信息，那么当解释器加载 pyc 文件的时候，只会得到一坨字节流，而无法解析字节流中隐藏的结构和蕴含的信息。所以在往 pyc 文件里写入数据之前，必须先写入一个标识，比如 TYPE_LIST、TYPE_TUPLE、TYPE_DICT 等等，这些标识正是对应的类型信息。 如果解释器在 pyc 文件中发现了这样的标识，则预示着上一个对象结束，新的对象开始，并且也知道新对象是什么样的对象，从而也知道该执行什么样的构建动作。至于这些标识都是可以看到的，在底层已经定义好了。 到了这里可以看到，Python 对 PyCodeObject 对象的导出实际上是不复杂的。因为不管什么对象，最后都会归结为两种简单的形式，一种是数值写入，一种是字符串写入。 上面都是对数值的写入，比较简单，仅仅需要按照字节依次写入 pyc 即可。然而在写入字符串的时候，Python 设计了一种比较复杂的机制，有兴趣可以自己阅读源码，这里不再介绍。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的写入","id":"235","title":"pyc 文件的写入"},"236":{"body":"最后再来说一下字节码混淆，我们知道 pyc 是可以反编译的，而且目前也有现成的工具。但这些工具会将每一个指令都解析出来，所以字节码混淆的方式就是往里面插入一些恶意指令（比如加载超出范围的数据），让反编译工具在解析的时候报错，从而失去作用。 但插入的恶意指令还不能影响解释器执行，因此还要插入一些跳转指令，从而让解释器跳过恶意指令。 混淆之后多了两条指令，其中偏移量为 8 的指令，参数为 255，表示加载常量池中索引为 255 的元素。如果常量池没有这么多元素，那么显然会发生索引越界，导致反编译的时候报错。 但对于解释器来说，是可以正常执行的，因为在执行到偏移量为 6 的指令时出现了一个相对跳转，直接跳到偏移量为 6 + 4 = 10 的指令了。 因此对于解释器执行来说，混淆前后是没有区别的，但对于反编译工具而言则无法正常工作，因为它会把每个指令都解析一遍。根据这个思路，我们可以插入很多很多的恶意指令，然后再利用跳转指令来跳过这些不合法的指令。当然混淆的手段并不止这些，我们还可以添加一些虚假的分支，然后在执行时跳转到真实的分支当中。 而这一切的目的，都是为了防止别人根据 pyc 文件反推出源代码。不过这种做法属于治标不治本，如果真的想要保护源代码的话，可以使用 Cython 将其编译成 pyd ，这是最推荐的做法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » 字节码混淆","id":"236","title":"字节码混淆"},"237":{"body":"从现在开始，我们将剖析虚拟机运行字节码的原理。前面说了，Python 解释器可以分为两部分：Python 编译器和 Python 虚拟机。编译器将源代码编译成 PyCodeObject 对象之后，就由虚拟机接手整个工作。虚拟机会从 PyCodeObject 中读取字节码，并在当前的上下文中执行，直到所有的字节码都被执行完毕。 那么问题来了，既然源代码在经过编译之后，字节码指令以及静态信息都存储在 PyCodeObject 当中，那么是不是意味着虚拟机就在 PyCodeObject 对象上进行所有的动作呢？ 很明显不是的，因为尽管 PyCodeObject 包含了关键的字节码指令以及静态信息，但有一个东西是没有包含、也不可能包含的，就是程序在运行时的执行环境，这个执行环境在 Python 里面就是栈帧。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 楔子","id":"237","title":"楔子"},"238":{"body":"那什么是栈帧呢？我们举个例子。 name = \"古明地觉\" def some_func(): name = \"八意永琳\" print(name) some_func()\nprint(name) 上面的代码当中出现了两个 print(name)，它们的字节码指令相同，但执行的效果却显然是不同的，这样的结果正是执行环境的不同所产生的。因为环境的不同，name 的值也不同。 因此同一个符号在不同环境中可能指向不同的类型、不同的值，必须在运行时进行动态捕捉和维护，这些信息不可能在 PyCodeObject 对象中被静态存储。 所以可以得出结论，虚拟机并不是在 PyCodeObject 对象上执行操作的，而是在栈帧对象上。虚拟机在执行时，会根据 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。所以栈帧是虚拟机执行的上下文，执行时依赖的所有信息都存储在栈帧中。 然后对于上面的代码，我们可以大致描述一下流程： 首先基于模块的 PyCodeObject 创建一个栈帧，假设叫 A，所有的字节码都会在栈帧中执行，虚拟机可以从栈帧里面获取变量的值，也可以修改； 当发生函数调用的时候，这里是 some_func，那么虚拟机会在栈帧 A 之上，为 some_func 创建一个新的栈帧，假设叫 B，然后在栈帧 B 里面执行函数 some_func 的字节码指令； 在栈帧 B 里面也有一个名字为 name 的变量，但由于执行环境、或者说栈帧的不同，name 指向的对象也不同； 一旦函数 some_func 的字节码指令全部执行完毕，那么会将当前的栈帧 B 销毁（也可以保留），再回到调用者的栈帧中来。就像是递归一样，每当调用函数时，就会在当前栈帧之上创建一个新的栈帧，一层一层创建，一层一层返回；","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧：虚拟机的执行环境","id":"238","title":"栈帧：虚拟机的执行环境"},"239":{"body":"不难发现，Python 虚拟机执行字节码这个过程，就是在模拟操作系统运行可执行文件。比如： 程序加载 操作系统：加载可执行文件到内存，设置程序计数器。 Python 虚拟机：加载 .pyc 文件中的 PyCodeObject 对象，初始化字节码指令指针。 内存管理 操作系统：为进程分配内存空间，管理堆和栈。 Python 虚拟机：创建和管理 Python 对象，处理内存分配和垃圾回收。 指令执行 操作系统：CPU 逐条执行机器指令。 Python 虚拟机：虚拟机逐条执行字节码指令。 资源管理 操作系统：管理文件句柄、网络连接等系统资源。 Python 虚拟机：管理文件对象、套接字等 Python 级别的资源。 异常处理 操作系统：处理硬件中断和软件异常。 Python 虚拟机：捕获和处理 Python 异常。 我们简单地画一张示意图，来看看在一台普通的 x64 机器上，可执行文件是以什么方式运行的，在这里主要关注栈帧的变化。假设有三个函数，函数 f 调用了函数 g，函数 g 又调用了函数 h。 首先 CPU 有两个关键的寄存器，它们在函数调用和栈帧管理中扮演关键角色。 RSP（Stack Pointer）：栈指针，指向当前栈帧的顶部，或者说最后一个入栈的元素。因此随着元素的入栈和出栈，RSP 会动态变化。由于地址从栈底到栈顶是逐渐减小的，所以 RSP 会随着数据入栈而减小，随着数据出栈而增大。当然不管 RSP 怎么变，它始终指向当前栈的顶部。 RBP（Base Pointer）：基指针，指向当前栈帧的基址，它的作用是提供一个固定的参考点，用于访问当前函数的局部变量和参数。当新的帧被创建时，它的基址会保存上一个帧的基址，并由 RBP 指向。 我们用一段 C 代码来解释一下。 #include <stdio.h> int add(int a, int b) { int c = a + b; return c;\n} int main() { int a = 11; int b = 22; int result = add(a, b); printf(\"a + b = %d\\n\", result);\n} 当执行函数 main 的时候，RSP 指向 main 栈帧的顶部，RBP 指向 main 栈帧的基址。然后在 main 里面又调用了函数 add，那么毫无疑问，系统会在地址空间中，在 main 的栈帧之上为 add 创建栈帧。然后让 RSP 指向 add 栈帧的顶部，RBP 指向 add 栈帧的基址，而 add 栈帧的基址保存了上一级栈帧（main 栈帧）的基址。 当函数 add 执行结束时，会销毁对应栈帧，再将 RSP 和 RBP 恢复为创建 add 栈帧之前的值，这样程序的执行流程就又回到了函数 main 里面，当然程序的运行空间也回到了函数 main 的栈帧中。 不难发现，通过两个 CPU 寄存器 RSP、RBP，以及栈帧中保存的上一级栈帧的基址，完美地维护了函数之间的调用链，这就是可执行文件在 x64 机器上的运行原理。 那么 Python 里面的栈帧是怎样的呢？","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 虚拟机和操作系统","id":"239","title":"虚拟机和操作系统"},"24":{"body":"Python 中有两个类型对象比较特殊，一个是站在类型金字塔顶端的 type，另一个是站在继承金字塔顶端的 object。看完了 type，再来看看 object。 由于 object 的类型是 type，那么在初始化 PyBaseObject_Type 的时候，它的 ob_type 一定也被设置成了 &PyType_Type。 我们看一下 PyBaseObject_Type 的具体实现，它同样定义在 Objects/typeobject.c 中。 类型对象在创建的时候，ob_type 字段都会被初始化成 &PyType_Type，而 object 也不例外，所以它的类型为 type，这个非常简单。但 type 的基类是 object，又是怎么一回事呢？ 之前介绍类型对象的时候，我们说类型对象内部的 tp_base 指向继承的基类，那么对于 PyType_Type 来讲，它内部的 tp_base 肯定是 &PyBaseObject_Type，即 object。 但令我们吃鲸的是，它的 tp_base 居然是个 0，也就是说基类为空。 在 C 中，将指针变量赋值为 0 和赋值为 NULL 是等价的，因为 NULL 就是值为 0 的指针常量。 不是说 type 的基类是 object 吗？为啥 tp_base 是 0 呢。事实上如果你去看其它类型的话，会发现它们内部的 tp_base 也是 0。为 0 的原因就在于我们目前看到的类型对象还不够完善，因为 Python 的动态性，显然不可能在定义的时候就将所有字段属性都设置好、然后解释器一启动就得到我们平时使用的类型对象。 因此目前看到的类型对象还不是最终形态，有一部分字段属性是在解释器启动之后再动态完善的，而这个完善的过程被称为类型对象的初始化，它由函数 PyType_Ready 负责。 // Objects/typeobject.c int\nPyType_Ready(PyTypeObject *type)\n{ // ... // 注意这里的 type 是一个 C 函数的参数，不是 Python 里的 <class 'type'> // 获取类型对象的基类（指针） base = type->tp_base; // 如果类型对象的 tp_base 为空，并且本身也不是 &PyBaseObject_Type // 那么就将它的 tp_base 设置为 &PyBaseObject_Type if (base == NULL && type != &PyBaseObject_Type) { base = type->tp_base = &PyBaseObject_Type; Py_INCREF(base); } // ...\n} 当解释器发现类对象还没有初始化时，会将其作为参数传递给 PyType_Ready，进行初始化。 初始化过程会做很多的工作，用于完善类型对象，而其中一项工作就是设置基类。如果发现类型对象的基类为空，那么就将基类设置为 object，因为在 Python3 里面新式类都要继承 object。当然啦，这个类不能是 object 本身，object 的基类是 None，因为继承链向上要有一个终点。 当 PyType_Ready 完成初始化之后，就得到我们平常使用的类型对象了，最终 PyType_Type 和 PyBaseObject_Type 的关系如下。 因此到目前为止，type 和 object 之间的恩怨纠葛算是真相大白了，总结一下： 1）和自定义类不同，内置的类不是由 type 实例化得到的，它们都是在底层预先定义好的，不存在谁创建谁。只是内置的类在定义的时候，它们的类型都被设置成了 type。这样不管是内置的类，还是自定义类，在调用时都可以执行 type 的 __call__ 函数，从而让它们的行为是一致的。 2）虽然内置的类在底层预定义好了，但还有一些瑕疵，因为有一部分逻辑无法以源码的形式体现，只能在解释器启动的时候再动态完善。而这个完善的过程，便包含了基类的填充，会将基类设置成 object。 所以 type 和 object 是同时出现的，它们的存在需要依赖彼此。首先这两者会以不完全体的形式定义在源码中，并且在定义的时候将 object 的类型设置成 type；然后当解释器启动的时候，再经过动态完善，进化成完全体，而进化的过程中会将 type 的基类设置成 object。 因此 object 的类型是 type，type 继承 object 就是这么来的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的基类：PyBaseObject_Type","id":"24","title":"类型对象的基类：PyBaseObject_Type"},"240":{"body":"相较于 x64 机器上看到的那个简简单单的栈帧，Python 的栈帧实际上包含了更多的信息。注：栈帧也是一个对象。 // Include/frameobject.h typedef struct _frame { PyObject_VAR_HEAD struct _frame *f_back; PyCodeObject *f_code; PyObject *f_builtins; PyObject *f_globals; PyObject *f_locals; PyObject **f_valuestack; PyObject **f_stacktop; PyObject *f_trace; char f_trace_lines; char f_trace_opcodes; PyObject *f_gen; int f_lasti; int f_lineno; int f_iblock; char f_executing; PyTryBlock f_blockstack[CO_MAXBLOCKS]; PyObject *f_localsplus[1];\n} PyFrameObject; 下面来解释一下里面的每个字段都是啥含义，不过在解释之前，我们要先知道如何在 Python 中获取栈帧对象。 import inspect def foo(): # 返回当前所在的栈帧 # 这个函数实际上是调用了 sys._getframe(1) return inspect.currentframe() frame = foo()\nprint(frame) \"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\nprint(type(frame)) \"\"\"\n<class 'frame'>\n\"\"\" 我们看到栈帧的类型是 <class 'frame'>，正如 PyCodeObject 对象的类型是 <class 'code'> 一样，这两个类没有暴露给我们，所以不可以直接使用。 同理，还有 Python 的函数，类型是 <class 'function'>，模块的类型是 <class 'module'>。这些解释器都没有给我们提供，如果直接使用的话，那么 frame、code、function、module 只是几个没有定义的变量罢了，这些类我们只能通过这种间接的方式获取。 下面来看一下 PyFrameObject 里面每个字段的含义。 PyObject_VAR_HEAD 变长对象的头部信息，所以栈帧也是一个对象。 struct _frame *f_back 当前栈帧的上一级栈帧，也就是调用者的栈帧。所以 x64 机器是通过 RSP、RBP 两个指针维护函数的调用关系，而 Python 虚拟机则是通过栈帧的 f_back 字段。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame)\n\"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\n# foo 的上一级栈帧，显然对应的是模块的栈帧\nprint(frame.f_back)\n\"\"\"\n<frame at 0x100adde40, file '.../main.py', line 12, code <module>>\n\"\"\"\n# 相当于模块的上一级栈帧，显然是 None\nprint(frame.f_back.f_back)\n\"\"\"\nNone\n\"\"\" 因此通过栈帧，可以轻松地获取完整的函数调用链路，我们一会儿演示。 PyCodeObject *f_code 栈帧对象是在 PyCodeObject 之上构建的，所以它内部一定有一个字段指向 PyCodeObject，而该字段就是 f_code。 import inspect def e(): f() def f(): g() def g(): h() def h(): frame = inspect.currentframe() # 获取栈帧 func_names = [] # 只要 frame 不为空，就一直循环，并将函数名添加到列表中 while frame is not None: func_names.append(frame.f_code.co_name) frame = frame.f_back print(f\"函数调用链路：{' -> '.join(func_names[:: -1])}\") f()\n\"\"\"\n函数调用链路：<module> -> f -> g -> h\n\"\"\" 模块 -> f -> g -> h，显然我们获取了整个调用链路，是不是很有趣呢？ PyObject *f_builtins、*f_gloabls、*f_locals 这三者均表示名字空间，其中 f_gloabls 指向全局名字空间（一个字典），它是全局变量的容身之所。是的，Python 的全局变量是通过字典存储的，调用函数 globals 即可拿到该字典。 # 等价于 name = \"古明地觉\"\nglobals()[\"name\"] = \"古明地觉\" # 等价于 print(name)\nprint(globals()[\"name\"]) # 古明地觉 def foo(): import inspect return inspect.currentframe() frame = foo()\n# frame.f_globals 同样会返回全局名字空间\nprint(frame.f_globals is globals()) # True\n# 相当于创建了一个全局变量 age\nframe.f_globals[\"age\"] = 18\nprint(age) # 18 关于名字空间，我们后面会用专门的篇幅详细说明。 然后 f_locals 指向局部名字空间（一个字典），但和全局变量不同，局部变量不存在局部名字空间中，而是静态存储在数组中。该字段先有个印象，后续再详细说。 f_builtins 指向内置名字空间（一个字典），显然一些内置的变量都存在里面。 def foo(): import inspect return inspect.currentframe() frame = foo()\nprint(frame.f_builtins[\"list\"](\"abcd\"))\n\"\"\"\n['a', 'b', 'c', 'd']\n\"\"\" 和我们直接使用 list(\"abcd\") 是等价的。 PyObject **f_valuestack 指向运行时栈的栈底，关于什么是运行时栈，后续详细说明。 PyObject **f_stacktop 指向运行时栈的栈顶。 PyObject *f_trace 追踪函数，用于调试。 char f_trace_lines 是否为每一行代码调用追踪函数，当设置为真（非零值）时，每当虚拟机执行到一个新的代码行时，都会调用追踪函数。这允许调试器在每行代码执行时进行干预，比如设置断点、检查变量等。 char f_trace_opcodes 是否为每个字节码指令调用追踪函数，当设置为真时，虚拟机会在执行每个字节码指令之前调用追踪函数。这提供了更细粒度的控制，允许进行指令级别的调试。 所以不难发现，f_trace_lines 是行级追踪，对应源代码的每一行，通常用于普通的调试，如设置断点、单步执行等，并且开销相对较小。f_trace_opcodes 是指令级追踪，对应每个字节码指令，通常用于更深层次的调试，比如分析具体的字节码执行过程，并且开销较大。 import sys def trace_lines(frame, event, arg): print(f\"行号：{frame.f_lineno}，文件名：{frame.f_code.co_filename}\") return trace_lines sys.settrace(trace_lines) 设置追踪函数一般需要通过 sys.settrace，不过不常用，了解一下即可。 PyObject *f_gen 是否是基于生成器的 PyCodeObject 构建的栈帧。 int f_lasti 上一条已执行完毕的指令在指令序列中的偏移量。 int f_lineno 获取该栈帧时的源代码行号。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame.f_lineno) # 4 我们是在第 4 行获取的栈帧，所以打印结果是 4。 int f_iblock 用于跟踪 try / except / finally 代码块的层级深度。具体等介绍异常捕获的时候再说，总之 f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。 char f_executing 当前栈帧是否仍在执行。 PyTryBlock f_blockstack[CO_MAXBLOCKS] 一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？ SETUP_FINALLY：try / finally 块 SETUP_WITH：with 语句块 SETUP_ASYNC_WITH：async with 语句块 PyObject *localsplus[1] 一个柔性数组，负责维护 \"局部变量 + cell 变量 + free 变量 + 运行时栈\"，大小在运行时确定。 以上就是栈帧内部的字段，这些字段先有个印象，后续在剖析虚拟机的时候还会继续细说。 总之我们看到，PyCodeObject 并不是虚拟机的最终目标，虚拟机最终是在栈帧中执行的。每一个栈帧都会维护一个 PyCodeObject 对象，换句话说，每一个 PyCodeObject 对象都会隶属于一个栈帧。并且从 f_back 可以看出，虚拟机在实际执行时，会产生很多的栈帧对象，而这些对象会被链接起来，形成一条执行环境链表，或者说栈帧链表。 而这正是 x64 机器上栈帧之间关系的模拟，在 x64 机器上，栈帧之间通过 RSP 和 RBP 指针建立了联系，使得新栈帧在结束之后能够顺利地返回到旧栈帧中，而 Python 虚拟机则是利用 f_back 来完成这个动作。 当然，获取栈帧除了通过 inspect 模块之外，在捕获异常时，也可以获取栈帧。 def foo(): try: 1 / 0 except ZeroDivisionError: import sys # exc_info 返回一个三元组 # 分别是异常的类型、值、以及 traceback exc_type, exc_value, exc_tb = sys.exc_info() print(exc_type) # <class 'ZeroDivisionError'> print(exc_value) # division by zero print(exc_tb) # <traceback object at 0x00000135CEFDF6C0> # 调用 exc_tb.tb_frame 即可拿到异常对应的栈帧 # 另外这个 exc_tb 也可以通过下面这种方式获取 # except ZeroDivisionError as e; e.__traceback__ print(exc_tb.tb_frame.f_code.co_name) # foo print(exc_tb.tb_frame.f_back.f_code.co_name) # <module> # 显然 tb_frame 是当前函数 foo 的栈帧 # 那么 tb_frame.f_back 就是整个模块对应的栈帧 # 而 tb_frame.f_back.f_back 显然就是 None 了 print(exc_tb.tb_frame.f_back.f_back) # None foo() 关于栈帧内部的字段的含义，我们就说完了。当然如果有些字段现在不是很理解，也没关系，随着不断地学习，你会豁然开朗。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧的底层结构","id":"240","title":"栈帧的底层结构"},"241":{"body":"因为很多动态信息无法静态地存储在 PyCodeObject 对象中，所以 PyCodeObject 对象在交给虚拟机之后，虚拟机会在其之上动态地构建出 PyFrameObject 对象，也就是栈帧。 因此虚拟机是在栈帧里面执行的字节码，它包含了虚拟机在执行字节码时依赖的全部信息。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 小结","id":"241","title":"小结"},"242":{"body":"在介绍栈桢的时候，我们看到了 3 个独立的名字空间：f_locals、f_globals、f_builtins。名字空间对 Python 来说是一个非常重要的概念，虚拟机的运行机制和名字空间有着非常紧密的联系。并且在 Python 中，与名字空间这个概念紧密联系在一起的还有名字、作用域这些概念，下面我们就来剖析这些概念是如何体现的。","breadcrumbs":"55. 名字空间：变量的容身之所 » 楔子","id":"242","title":"楔子"},"243":{"body":"在这个系列的最开始我们就说过，从解释器的角度来看，变量只是一个泛型指针 PyObject *，而从 Python 的角度来看，变量只是一个名字、或者说符号，用于和对象进行绑定的。 name = \"古明地觉\" 上面这个赋值语句其实就是将 name 和 \"古明地觉\" 绑定起来，让我们可以通过 name 这个符号找到对应的 PyUnicodeObject。因此定义一个变量，本质上就是建立名字和对象之间的映射关系。 另外我们说 Python 虽然一切皆对象，但拿到的都是指向对象的指针，因此创建函数和类，以及模块导入，同样是在完成名字和对象的绑定。 def foo(): pass class A(): pass 创建一个函数也相当于定义一个变量，会先根据函数体创建一个函数对象，然后将名字 foo 和函数对象绑定起来。所以函数名和函数体之间是分离的，同理类也是如此。 import os 导入一个模块，也是在定义一个变量。import os 相当于将名字 os 和模块对象绑定起来，通过 os 可以找到指定的模块对象。 当我们导入一个模块的时候，解释器是这么做的。 import os 等价于 os = __import__(\"os\")，可以看到本质上还是一个赋值语句。 import numpy as np 中的 as 语句同样是在定义变量，将名字 np 和对应的模块对象绑定起来，以后就可以通过 np 这个名字去获取指定的模块了。 总结：无论是普通的赋值语句，还是定义函数和类，亦或是模块导入，它们本质上都是在完成变量和对象的绑定。 name = \"古明地觉\" def foo(): pass class A(): pass import os\nimport numpy as np 里面的 name、foo、A、os、np，都只是一个变量，或者说名字、符号，然后通过名字可以获取与之绑定的对象。","breadcrumbs":"55. 名字空间：变量的容身之所 » 变量只是一个名字","id":"243","title":"变量只是一个名字"},"244":{"body":"正如上面所说，赋值语句、函数定义、类定义、模块导入，本质上只是完成了变量和对象之间的绑定，或者说我们创建了变量到对象的映射，通过变量可以获取对应的对象，而它们的容身之所就是名字空间。 所以名字空间是通过 PyDictObject 对象实现的，这对于映射来说简直再适合不过了。而前面介绍字典的时候，我们说字典是被高度优化的，原因就是虚拟机本身也重度依赖字典，从这里的名字空间即可得到体现。 当然，在一个模块内部，变量还存在可见性的问题，比如： x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 我们看到同一个变量名，打印的确是不同的值，说明指向了不同的对象，换句话说这两个变量是在不同的名字空间中被创建的。 名字空间本质上是一个字典，如果两者在同一个名字空间，那么由于 key 的不重复性，当执行 x = 2 的时候，会把字典里面 key 为 \"x\" 的 value 给更新成 2。但是在外面还是打印 1，这说明两者所在的不是同一个名字空间，打印的也就自然不是同一个 x。因此对于一个模块而言，内部可以存在多个名字空间，每一个名字空间都与一个作用域相对应。作用域可以理解为一段程序的正文区域，在这个区域里面定义的变量是有意义的，然而一旦出了这个区域，就无效了。 关于作用域这个概念，我们要记住：它仅仅是由源代码的文本所决定。在 Python 中，一个变量在某个位置是否起作用，是由它的文本位置决定的。 因此 Python 具有静态作用域（词法作用域），而名字空间则是作用域的动态体现，一个由程序文本定义的作用域在运行时会转化为一个名字空间、即一个 PyDictObject 对象。比如进入一个函数，显然会进入一个新的作用域，因此函数在执行时，会创建一个名字空间。 在介绍 PyCodeObject 的时候，我们说解释器在对源代码进行编译的时候，对于代码中的每一个 code block，都会创建一个 PyCodeObject 对象与之对应。而当进入一个新的名字空间、或者说作用域时，就算是进入一个新的 block 了。 而根据我们使用 Python 的经验，显然函数、类都是一个新的 block，解释器在执行的时候会为它们创建各自的名字空间。 所以名字空间是名字、或者说变量的上下文环境，名字的含义取决于名字空间。更具体的说，一个变量绑定的对象是不确定的，需要由名字空间来决定。位于同一个作用域的代码可以直接访问作用域中出现的名字，即所谓的直接访问；但不同的作用域，则需要通过访问修饰符 . 进行属性访问。 class A: x = 1 class B: y = 2 print(A.x) # 1 print(y) # 2 如果想在 B 里面访问 A 里面的内容，要通过 A.属性的方式，表示通过 A 来获取 A 里面的属性。但是访问 B 的内容就不需要了，因为都是在同一个作用域，所以直接访问即可。 访问名字这样的行为被称为名字引用，名字引用的规则决定了 Python 程序的行为。 x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 还是上面的代码，如果我们把函数里面的 x = 2 给删掉，意味着函数的作用域里面已经没有 x 这个变量了，那么再执行程序会有什么结果呢？从 Python 层面来看，显然是会寻找外部的 x。因此我们可以得到如下结论： 作用域是层层嵌套的； 内层作用域可以访问外层作用域； 外层作用域无法访问内层作用域，如果是把外层的 x = 1 给去掉，那么最后面的 print(x) 铁定报错； 查找元素会依次从当前作用域向外查找，也就是查找元素时，对应的作用域是按照从小往大、从里往外的方向前进的；","breadcrumbs":"55. 名字空间：变量的容身之所 » 作用域和名字空间","id":"244","title":"作用域和名字空间"},"245":{"body":"不光函数、类有自己的作用域，模块对应的源文件本身也有相应的作用域。比如： name = \"古明地觉\"\nage = 16 def foo(): return 123 class A: pass 这个文件本身也有自己的作用域，并且是 global 作用域，所以解释器在运行这个文件的时候，也会为其创建一个名字空间，而这个名字空间就是 global 名字空间，即全局名字空间。它里面的变量是全局的，或者说是模块级别的，在当前文件的任意位置都可以直接访问。 而 Python 也提供了 globals 函数，用于获取 global 名字空间。 name = \"古明地觉\" def foo(): pass print(globals())\n\"\"\"\n{..., 'name': '古明地觉', 'foo': <function foo at 0x0000015255143E20>}\n\"\"\" 里面的 ... 表示省略了一部分输出，我们看到创建的全局变量就在里面。而且 foo 也是一个全局变量，它指向一个函数对象。 注意：我们说函数内部是一个独立的 block，因此它会对应一个 PyCodeObject。然后在解释到 def foo 的时候，会根据 PyCodeObject 对象创建一个 PyFunctionObject 对象，然后将 foo 和这个函数对象绑定起来。 当后续调用 foo 的时候，再根据 PyFunctionObject 对象创建 PyFrameObject 对象、然后执行，至于具体细节留到介绍函数的时候再细说。总之，我们看到 foo 也是一个全局变量，全局变量都在 global 名字空间中。并且 global 名字空间全局唯一，它是程序运行时的全局变量和与之绑定的对象的容身之所。你在任何一个位置都可以访问到 global 名字空间，正如你在任何一个位置都可以访问全局变量一样。 另外我们思考一下，global 名字空间是一个字典，全局变量和对象会以键值对的形式存在里面。那如果我手动地往 global 名字空间里面添加一个键值对，是不是也等价于定义一个全局变量呢？ globals()[\"name\"] = \"古明地觉\"\nprint(name) # 古明地觉 def foo1(): def foo2(): def foo3(): globals()[\"age\"] = 16 return foo3 return foo2 foo1()()()\nprint(age) # 16 我们看到确实如此，往 global 名字空间里面插入一个键值对完全等价于定义一个全局变量。并且 global 名字空间是唯一的，你在任何地方调用 globals() 得到的都是 global 名字空间，正如你在任何地方都可以访问到全局变量一样。 所以即使是在函数中给 global 名字空间添加一个键值对，也等价于定义一个全局变量。 问题来了，如果在函数里面，我们不获取 global 名字空间，怎么创建全局变量呢？ name = \"古明地觉\" def foo(): global name name = \"古明地恋\" print(name) # 古明地觉\nfoo()\nprint(name) # 古明地恋 很简单，Python 为我们准备了 global 关键字，表示声明的变量是全局的。","breadcrumbs":"55. 名字空间：变量的容身之所 » global 名字空间","id":"245","title":"global 名字空间"},"246":{"body":"像函数和类拥有的作用域，我们称之为 local 作用域，在运行时会对应 local 名字空间，即局部名字空间。由于不同的函数具有不同的作用域，所以局部名字空间可以有很多个，但全局名字空间只有一个。 对于 local 名字空间来说，它也对应一个字典，显然这个字典就不是全局唯一的了。而如果想获取局部名字空间，Python 也提供了 locals 函数。 def foo(): name = \"古明地觉\" age = 17 return locals() def bar(): name = \"雾雨魔理沙\" age = 18 return locals() print(locals() == globals()) # True\nprint(foo()) # {'name': '古明地觉', 'age': 17}\nprint(bar()) # {'name': '雾雨魔理沙', 'age': 18} 对于模块来讲，它的 local 名字空间和 global 名字空间是一样的，也就是说，模块对应的栈桢对象里面的 f_locals 和 f_globals 指向的是同一个 PyDictObject 对象。但对于函数而言，局部名字空间和全局名字空间就不一样了，调用 locals() 是获取自身的局部名字空间，而不同函数的局部名字空间是不同的。但是 globals() 函数的调用结果是一样的，获取的都是全局名字空间，这也符合函数内不存在指定变量的时候会去找全局变量这一结论。 注：关于 local 名字空间，还有一个重要的细节，全局变量会存储在 global 名字空间中，但局部变量却并不存储在 local 名字空间中。函数有哪些局部变量在编译的时候就已经确定了，会被静态存储在数组中，关于这一点，后续会单独详细说明。","breadcrumbs":"55. 名字空间：变量的容身之所 » local 名字空间","id":"246","title":"local 名字空间"},"247":{"body":"Python 有一个所谓的 LGB 规则，指的是在查找一个变量时，会按照自身的 local 空间、外层的 global 空间、内置的 builtin 空间的顺序进行查找。 builtin 名字空间也是一个字典，当 local 名字空间、global 名字空间都查找不到指定变量的时候，会去 builtin 空间查找。而关于 builtin 空间的获取，Python 提供了一个模块。 # 等价于 __builtins__\nimport builtins\nprint(builtins is __builtins__) # True\nprint(builtins) # <module 'builtins' (built-in)> builtins 是一个模块，那么 builtins.__dict__ 便是 builtin 名字空间，也叫内置名字空间。 import builtins # builtins.list 表示从 builtin 名字空间中查找 list\n# 它等价于 builtins.__dict__[\"list\"]\n# 而如果只写 list，那么由于 local 空间、global 空间都没有\n# 因此最终还是会从 builtin 空间中查找\n# 但如果是 builtins.list，那么就不兜圈子了\n# 表示：\"builtin 空间，就从你这里获取了\"\nprint(builtins.list is list) # True # 将 builtin 空间的 dict 改成 123\nbuiltins.dict = 123\n# 那么此时获取的 dict 就是 123\nprint(dict + 456) # 579 # 如果是 str = 123，等价于创建全局变量 str = 123\nstr = 123\n# 显然影响的是 global 空间\nprint(str) # 123\n# builtin 空间则不受影响\nprint(builtins.str) # <class 'str'>\nprint(builtins.__dict__[\"str\"]) # <class 'str'> 这里提一下在 Python2 中，while 1 比 while True 要快，为什么？ 因为 True 在 Python2 中不是关键字，所以它是可以作为变量名的。那么虚拟机在执行的时候就要先看 local 空间和 global 空间里有没有 True 这个变量，有的话使用我们定义的，没有的话再使用内置的 True。 而 1 是一个常量，直接加载就可以，所以 while True 多了符号查找这一过程。但是在 Python3 中两者就等价了，因为 True 在 Python3 中是一个关键字，也会直接作为一个常量来加载。","breadcrumbs":"55. 名字空间：变量的容身之所 » builtin 名字空间","id":"247","title":"builtin 名字空间"},"248":{"body":"记得之前介绍 exec 和 eval 的时候，我们说这两个函数里面还可以接收第二个参数和第三个参数，它们分别表示 global 名字空间、local 名字空间。 # 如果不指定，默认是当前所在的名字空间\n# 显然此时是全局名字空间\nexec(\"name = '古明地觉'\")\nprint(name) # 古明地觉 # 但我们也可以指定某个名字空间\nnamespace = {}\n# 比如将 namespace 作为全局名字空间\n# 另外这里没有指定第三个参数，也就是局部名字空间\n# 如果指定了第二个参数，但没有指定第三个参数\n# 那么第三个参数默认和第二个参数保持一致\nexec(\"name = 'satori'\", namespace)\nprint(namespace[\"name\"]) # satori 至于 eval 也是同理： namespace = {\"seq\": [1, 2, 3, 4, 5]}\ntry: print(eval(\"sum(seq)\"))\nexcept NameError as e: print(e) # name 'seq' is not defined\n# 告诉我们 seq 没有被定义\n# 如果将 namespace 作为名字空间\nprint(eval(\"sum(seq)\", namespace)) # 15 所以名字空间本质上就是一个字典，所谓的变量不过是字典里面的一个 key。为了进一步加深印象，再举个模块的例子： # 我们自定义一个模块吧\n# 首先模块也是一个对象，类型为 <class 'module'>\n# 但底层没有将这个类暴露给我们，所以需要换一种方式获取\nimport sys\nModuleType = type(sys) # 以上就拿到了模块的类型对象，调用即可得到模块对象\n# 这里我们自定义一个类，继承 ModuleType\nclass MyModule(ModuleType): def __init__(self, module_name): self.module_name = module_name super().__init__(module_name) # 也可以定义一些其它的属性 def __str__(self): return f\"<module '{self.module_name}' from '虚无之境'>\" my_module = MyModule(\"自定义模块\")\nprint(my_module)\n\"\"\"\n<module '自定义模块' from '虚无之境'>\n\"\"\" # 此时的 my_module 啥也没有，我们为其添砖加瓦\nmy_module.__dict__[\"name\"] = \"古明地觉\"\nprint(my_module.name) # 古明地觉 # 给模块设置属性，本质上也是操作模块的属性字典，当然获取属性也是如此\n# 如果再和 exec 结合的话\ncode_string = \"\"\"\nage = 16\ndef foo(): return \"我是函数 foo\" from functools import reduce \"\"\"\n# 将属性设置在模块的属性字典里面\nexec(code_string, my_module.__dict__)\n# 然后我们获取它\nprint(my_module.age) # 16\nprint(my_module.foo()) # 我是函数 foo\nprint(my_module.reduce(int.__add__, range(101))) # 5050 # 是不是很神奇呢？由于 my_module 是一个模块对象\n# 我们还可以将它注入到 sys.modules 中，然后通过 import 获取\nsys.modules[\"俺滴模块\"] = my_module\nfrom 俺滴模块 import name, age, foo\nprint(name) # 古明地觉\nprint(age) # 16\nprint(foo()) # 我是函数 foo 怎么样，是不是很有意思呢？相信你对名字空间已经有了足够清晰的认识，它是变量和与之绑定的对象的容身之所。","breadcrumbs":"55. 名字空间：变量的容身之所 » exec 和 eval","id":"248","title":"exec 和 eval"},"249":{"body":"名字空间是 Python 的灵魂，它规定了一个变量应该如何查找，关于变量查找，下一篇文章来详细介绍，到时你会对名字空间有更加透彻的理解。 然后是作用域，所谓名字空间其实就是作用域的动态体现。整个 py 文件是一个作用域，也是全局作用域；定义函数、定义类、定义方法，又会创建新的作用域，这些作用域层层嵌套。那么同理，运行时的名字空间也是层层嵌套的，形成一条名字空间链。内层的变量对外层是不可见的，但外层的变量对内层是可见的。 然后全局名字空间是一个字典，它是唯一的，操作里面的键值对等价于操作全局变量；至于局部名字空间则不唯一，每一个函数都有自己的局部名字空间，但我们要知道函数内部在访问局部变量的时候是静态访问的（相关细节后续聊）。 还有内置名字空间，可以通过 __builtins__ 获取，但拿到的是一个模块，再获取它的属性字典，那么就是内置名字空间了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"55. 名字空间：变量的容身之所 » 小结","id":"249","title":"小结"},"25":{"body":"至此，我们算是从解释器的角度完全理清了 Python 中对象之间的关系，用之前的一张图总结一下。 当然，目前还远远没有结束，后续还会针对内置的对象进行专门的剖析，如浮点数、整数、字符串、字节串、元组、列表、字典、集合等等，都会一点一点剖析。我们会从 Python 的角度介绍对象该怎么用，然后再看它的底层实现，最后再用 Python 代码进行验证，加深理解。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 小结","id":"25","title":"小结"},"250":{"body":"上一篇文章我们介绍了名字空间，并且知道了全局变量都存在 global 名字空间中，往 global 空间添加一个键值对相当于定义一个全局变量。那么问题来了，如果往函数的 local 空间里面添加一个键值对，是不是也等价于创建了一个局部变量呢？ def foo(): locals()[\"name\"] = \"古明地觉\" try: print(name) except Exception as e: print(e) foo() # name 'name' is not defined 全局变量的创建是通过向字典添加键值对实现的，因为全局变量会一直变，需要使用字典来动态维护。 但对于函数来讲，内部的变量是通过静态方式存储和访问的，因为局部作用域中存在哪些变量在编译的时候就已经确定了，我们通过 PyCodeObject 的 co_varnames 即可获取内部都有哪些变量。 所以，虽然我们说变量查找遵循 LGB 规则，但函数内部的变量其实是静态访问的，不过完全可以按照 LGB 的方式理解。关于这方面的细节，后续还会细说。 因此名字空间是 Python 的灵魂，它规定了变量的作用域，使得 Python 对变量的查找变得非常清晰。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 楔子","id":"250","title":"楔子"},"251":{"body":"LGB 是针对 Python2.2 之前的，而从 Python2.2 开始，由于引入了嵌套函数，所以内层函数在找不到某个变量时应该先去外层函数找，而不是直接就跑到 global 空间里面找，那么此时的规则就是 LEGB。 x = 1 def foo(): x = 2 def bar(): print(x) return bar foo()()\n\"\"\"\n2\n\"\"\" 调用了内层函数 bar，如果按照 LGB 的规则来查找的话，由于函数 bar 的作用域没有 a，那么应该到全局里面找，打印的结果是 1 才对。 但我们之前说了，作用域仅仅是由文本决定的，函数 bar 位于函数 foo 之内，所以函数 bar 定义的作用域内嵌于函数 foo 的作用域之内。换句话说，函数 foo 的作用域是函数 bar 的作用域的直接外围作用域。所以应该先从 foo 的作用域里面找，如果没有那么再去全局里面找，而作用域和名字空间是对应的，所以最终打印了 2。 另外在调用 foo() 的时候，会执行函数 foo 中的 def bar(): 语句，这个时候解释器会将 a = 2 与函数 bar 捆绑在一起，然后返回，这个捆绑起来的整体就叫做闭包。 所以：闭包 = 内层函数 + 引用的外层作用域。 而这里显示的规则就是 LEGB，其中 E 表示 Enclosing，代表直接外围作用域。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » LEGB 规则","id":"251","title":"LEGB 规则"},"252":{"body":"在初学 Python 时，估计很多人都会对下面的问题感到困惑。 x = 1 def foo(): print(x) foo()\n\"\"\"\n1\n\"\"\" 首先这段代码打印 1，这显然是没有问题的，不过下面问题来了。 x = 1 def foo(): print(x) x = 2 foo() 这段代码在执行 print(x) 的时候是会报错的，会抛出一个 UnboundLocalError: local variable 'x' referenced before assignment，意思是局部变量 x 在赋值之前就被使用了。 那么问题来了，在 print(x) 的下面加一个 x = 2，整体效果不应该是先打印全局变量 x，然后再创建一个局部变量 x 吗？为啥就报错了呢，相信肯定有人为此困惑。如果想弄明白这个错误的原因，需要深刻理解两点： 函数中的变量是静态存储、静态访问的，内部有哪些变量在编译的时候就已经确定； 局部变量在整个作用域内都是可见的； 在编译的时候，因为 x = 2 这条语句，所以知道函数中存在一个局部变量 x，那么查找的时候就会在当前局部作用域中查找，但还没来得及赋值，就 print(x) 了。换句话说，在打印 x 的时候，它还没有和某个具体的值进行绑定，所以报错：局部变量 x 在赋值之前就被使用了。 但如果没有 x = 2 这条语句则不会报错，因为知道局部作用域中不存在 x 这个变量，所以会找全局变量 x，从而打印 1。 更有趣的东西隐藏在字节码当中，我们可以通过反汇编来查看一下： import dis x = 1 def foo(): print(x) dis.dis(foo)\n\"\"\" 6 0 LOAD_GLOBAL 0 (print) 2 LOAD_GLOBAL 1 (x) 4 CALL_FUNCTION 1 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE\n\"\"\" def bar(): print(x) x = 2 dis.dis(bar) \"\"\" 19 0 LOAD_GLOBAL 0 (print) 2 LOAD_FAST 0 (x) 4 CALL_FUNCTION 1 6 POP_TOP 20 8 LOAD_CONST 1 (2) 10 STORE_FAST 0 (x) 12 LOAD_CONST 0 (None) 14 RETURN_VALUE\n\"\"\" 第二列的序号代表字节码指令的偏移量，我们看偏移量为 2 的指令，函数 foo 对应的指令是 LOAD_GLOBAL，意思是在 global 空间中查找 x。而函数 bar 的指令是 LOAD_FAST，表示在数组中静态查找 x，但遗憾的是，此时 x 还没有和某个值进行绑定。 因此结果说明 Python 采用了静态作用域策略，在编译的时候就已经知道变量藏身于何处。而且这个例子也表明，一旦函数内有了对某个变量的赋值操作，它会在整个作用域内可见，因为编译时就已经确定。换句话说，会遮蔽外层作用域中相同的名字。 我们看一下函数 foo 和函数 bar 的符号表。 x = 1 def foo(): print(x) def bar(): print(x) x = 2 print(foo.__code__.co_varnames) # ()\nprint(bar.__code__.co_varnames) # ('x',) 在编译的时候，就知道函数 bar 里面存在局部变量 x。 如果想修复这个错误，可以用之前说的 global 关键字，将变量 x 声明为全局的。 x = 1 def bar(): global x # 表示变量 x 是全局变量 print(x) x = 2 bar() # 1\nprint(x) # 2 但这样的话，会导致外部的全局变量被修改，如果不想出现这种情况，那么可以考虑直接获取全局名字空间。 x = 1 def bar(): print(globals()[\"x\"]) x = 2 bar() # 1\nprint(x) # 1 这样结果就没问题了，同样的，类似的问题也会出现在嵌套函数中。 def foo(): x = 1 def bar(): print(x) x = 2 return bar foo()() 执行内层函数 bar 的时候，print(x) 也会出现 UnboundLocalError，如果想让它不报错，而是打印外层函数中的 x，该怎么做呢？Python 同样为我们准备了一个关键字：nonlocal。 def foo(): x = 1 def bar(): # 使用 nonlocal 的时候，必须是在内层函数里面 nonlocal x print(x) x = 2 return bar foo()() # 1 如果 bar 里面是 global x，那么表示 x 是全局变量，当 foo()() 执行完毕之后，会创建一个全局变量 x = 2。但这里不是 global，而是 nonlocal，表示 x 是外部作用域中的变量，因此会打印 foo 里面的变量 x。 当然啦，既然声明为 nonlocal，那么 foo 里面的 x 肯定会受到影响。 import inspect frame = None def foo(): globals()[\"frame\"] = inspect.currentframe() x = 1 def bar(): nonlocal x # print(x) x = 2 return bar bar = foo()\n# 打印 foo 的局部变量，此时变量 x 的值为 1\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 1}\n\"\"\"\n# 调用内层函数 bar\nbar()\n# 此时 foo 的局部变量 x 的值变成了 2\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 2}\n\"\"\" 不过由于 foo 是一个函数，调用内层函数 bar 的时候，外层函数 foo 已经结束了，所以不管怎么修改它里面的变量，都无所谓了。 另外上面的函数只嵌套了两层，即使嵌套很多层也是可以的。 import inspect frame = None def a(): def b(): globals()[\"frame\"] = inspect.currentframe() x = 123 def c(): def d(): def e(): def f(): nonlocal x print(x) x = 456 return f return e return d return c return b b = a()\nc = b()\nd = c()\ne = d()\nf = e()\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 123}\n\"\"\"\n# 调用函数 f 的时候，打印的是函数 b 里面的变量 x\n# 当然，最后也会修改它\nf()\n\"\"\"\n123\n\"\"\"\n# 可以看到 x 变成了 456\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 456}\n\"\"\" 不难发现，在嵌套多层的情况下，会采用就近原则。如果函数 d 里面也定义了变量 x，那么函数 f 里面的 nonlocal x 表示的就是函数 d 里面的局部变量 x。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » global 表达式","id":"252","title":"global 表达式"},"253":{"body":"当我们访问某个变量时，会按照 LEGB 的规则进行查找，而属性查找也是类似的，本质上都是到名字空间中查找一个名字所引用的对象。但由于属性查找限定了范围，所以要更简单，比如 a.xxx，就是到 a 里面去找属性 xxx，这个规则是不受 LEGB 作用域限制的，就是到 a 里面查找，有就是有，没有就是没有。 import numpy as np # 在 np 指向的对象（模块）中查找 array 属性\nprint(np.array([1, 2, 3]))\n\"\"\"\n[1 2 3]\n\"\"\"\n# 本质上就是去 np 的属性字典中查找 key = \"array\" 对应的 value\nprint(np.__dict__[\"array\"]([11, 22, 33]))\n\"\"\"\n[11 22 33]\n\"\"\" class Girl: name = \"古明地觉\" age = 16 print(Girl.name, Girl.age)\n\"\"\"\n古明地觉 16\n\"\"\"\nprint(Girl.__dict__[\"name\"], Girl.__dict__[\"age\"])\n\"\"\"\n古明地觉 16\n\"\"\" 需要补充一点，我们说属性查找会按照 LEGB 规则，但这必须限制在自身所在的模块内，如果是多个模块就不行了。举个例子，假设有两个 py 文件，内容如下： # girl.py\nprint(name) # main.py\nname = \"古明地觉\"\nfrom girl import name 关于模块的导入我们后续会详细说，总之执行 main.py 的时候报错了，提示变量 name 没有被定义，但问题是 main.py 里面定义了变量 name，为啥报错呢？ 很明显，因为 girl.py 里面没有定义变量 name，所以导入 girl 的时候报错了。因此结论很清晰了，变量查找虽然是 LEGB 规则，但不会越过自身所在的模块。print(name) 在 girl.py 里面，而变量 name 定义在 main.py 里面，在导入时不可能跨过 girl.py 的作用域去访问 main.py 里的 name，因此在执行 from girl import name 的时候会抛出 NameError。 虽然每个模块内部的作用域规则有点复杂，因为要遵循 LEGB；但模块与模块的作用域之间则划分得很清晰，就是相互独立。 关于模块，我们后续会详细说。总之通过属性操作符 . 的方式，本质上都是去指定的名字空间中查找对应的属性。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性查找","id":"253","title":"属性查找"},"254":{"body":"自定义的类里面如果没有 __slots__，那么这个类的实例对象会有一个属性字典，和名字空间的概念是等价的。 class Girl: def __init__(self): self.name = \"古明地觉\" self.age = 16 g = Girl()\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16} # 对于查找属性而言, 也是去属性字典中查找\nprint(g.name, g.__dict__[\"name\"]) # 古明地觉 古明地觉 # 同理设置属性, 也是更改对应的属性字典\ng.__dict__[\"gender\"] = \"female\"\nprint(g.gender) # female 当然模块也有属性字典，本质上和类的实例对象是一致的，因为模块本身就是一个实例对象。 print(__builtins__.str) # <class 'str'>\nprint(__builtins__.__dict__[\"str\"]) # <class 'str'> 另外这个 __builtins__ 位于 global 名字空间里面，然后获取 global 名字空间的 globals 又是一个内置函数，于是一个神奇的事情就出现了。 print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"] ) # <module 'builtins' (built-in)> print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"].list(\"abc\") ) # ['a', 'b', 'c'] global 名字空间和 builtin 名字空间，都保存了指向彼此的指针，所以不管套娃多少次，都是可以的。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性空间","id":"254","title":"属性空间"},"255":{"body":"整个内容很好理解，关键的地方就在于局部变量，它是静态存储的，编译期间就已经确定。而在访问局部变量时，也是基于数组实现的静态查找，而不是使用字典。 关于 local 空间，以及如何使用数组实现静态查找，我们后面还会详细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 小结","id":"255","title":"小结"},"256":{"body":"当解释器启动后，首先会进行运行时环境的初始化，注意这里的运行时环境，它和之前说的执行环境有很大不同，运行时环境是一个全局的概念，而执行环境是一个栈帧。 关于运行时环境的初始化是一个很复杂的过程，涉及到 Python 进程、线程的创建，类型对象的完善等非常多的内容，我们暂时先不讨论。这里就假设初始化动作已经完成，我们已经站在了虚拟机的门槛外面，只需要轻轻推动第一张骨牌，整个执行过程就像多米诺骨牌一样，一环扣一环地展开。 在介绍字节码的时候我们说过，解释器可以看成是：编译器+虚拟机，编译器负责将源代码编译成 PyCodeObject 对象，而虚拟机则负责执行。所以我们的重点就是虚拟机是怎么执行 PyCodeObject 对象的？整个过程是什么，掌握了这些，你对虚拟机会有一个更深的理解。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 楔子","id":"256","title":"楔子"},"257":{"body":"在介绍栈帧的时候我们说过，Python 是一门动态语言，一个变量指向什么对象需要在运行时才能确定，这些信息不可能静态存储在 PyCodeObject 对象中。所以虚拟机在运行时会基于 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。而创建栈帧，主要使用以下两个函数： // Python/ceval.c /* 基于 PyCodeObject、全局名字空间、局部名字空间，创建栈帧 * 参数非常简单，所以它一般适用于模块这种参数不复杂的场景 * 前面说了，模块也会对应一个栈帧，并且它位于栈帧链的最顶层 */\nPyObject *\nPyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)\n{ return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, (PyObject **)NULL, 0, (PyObject **)NULL, 0, NULL, NULL);\n} /* 相比 PyEval_EvalCode 多了很多的参数 * 比如里面有位置参数以及个数，关键字参数以及个数 * 还有默认参数以及个数，闭包等等，显然它用于函数等复杂场景 */\nPyObject *\nPyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, int argcount, PyObject *const *kws, int kwcount, PyObject *const *defs, int defcount, PyObject *kwdefs, PyObject *closure)\n{ return _PyEval_EvalCodeWithName(_co, globals, locals, args, argcount, kws, kws != NULL ? kws + 1 : NULL, kwcount, 2, defs, defcount, kwdefs, closure, NULL, NULL);\n} 我们看到 PyEval_EvalCode 也是调用了 PyEval_EvalCodeEx，后者是通用逻辑，只不过为模块创建栈帧时，参数非常简单，所以又封装了 PyEval_EvalCode 函数。 当然啦，上面这两个函数最终都会调用 _PyEval_EvalCodeWithName 函数，创建并初始化栈帧对象，我们来看一下该函数内部的逻辑。 // Python/ceval.c PyObject *\n_PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, Py_ssize_t argcount, PyObject *const *kwnames, PyObject *const *kwargs, Py_ssize_t kwcount, int kwstep, PyObject *const *defs, Py_ssize_t defcount, PyObject *kwdefs, PyObject *closure, PyObject *name, PyObject *qualname)\n{ PyCodeObject* co = (PyCodeObject*)_co; PyFrameObject *f; PyObject *retval = NULL; PyObject **fastlocals, **freevars; // ... // 调用 _PyFrame_New_NoTrack 函数创建栈帧 f = _PyFrame_New_NoTrack(tstate, co, globals, locals); if (f == NULL) { return NULL; } fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; // ... // 调用 PyEval_EvalFrameEx 在栈帧中执行字节码 retval = PyEval_EvalFrameEx(f,0); fail: assert(tstate != NULL); if (Py_REFCNT(f) > 1) { Py_DECREF(f); _PyObject_GC_TRACK(f); } else { ++tstate->recursion_depth; Py_DECREF(f); --tstate->recursion_depth; } return retval;\n} 这个函数的逻辑比较长，但做的事情很简单。 调用 _PyFrame_New_NoTrack 函数创建栈帧，并初始化内部字段。 栈帧创建完毕之后，里面的字段都是初始值，所以还要基于当前的 PyCodeObject 对象、位置参数、关键字参数、参数个数等信息修改栈帧字段，而省略掉的大部分代码就是在负责相关逻辑。以上这两步组合起来，就是我们之前说的基于 PyCodeObject 对象构建栈帧对象。 栈帧字段设置完毕之后，调用 PyEval_EvalFrameEx 函数，在栈帧中执行字节码。 当然，PyEval_EvalFrameEx 也不是整个流程的终点，它内部还调用了一个函数。 // Python/ceval.c PyObject *\nPyEval_EvalFrameEx(PyFrameObject *f, int throwflag)\n{ // interp 表示进程状态对象，它的 eval_frame 字段被设置为 _PyEval_EvalFrameDefault // 这个 _PyEval_EvalFrameDefault 函数便是虚拟机运行的核心，是一个代码量超级多的函数 PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE(); return interp->eval_frame(f, throwflag);\n} 所以整个流程很清晰了，我们画一张图。 所以 _PyEval_EvalFrameDefault 函数是虚拟机运行的核心，该函数较为复杂，我们会在下一篇文章中分析它的具体实现。至于本篇文章就先从宏观的角度来描述一下虚拟机执行字节码的流程，并对之前的内容做一个补充，将背后涉及的概念阐述一遍，这样后续看源码的时候也会事半功倍。 首先栈帧中有一个 f_code 字段，它指向 PyCodeObject 对象，该对象的 co_code 字段则保存着字节码指令序列。而虚拟机执行字节码就是从头到尾遍历整个 co_code，对指令逐条执行的过程。 另外也不要觉得字节码指令（简称指令）有多神秘，说白了它就是个 uint8 整数，而一个程序肯定会包含多条指令，它们整体便构成了指令集，或者说指令序列。那么显然，使用 bytes 对象来表示指令序列再合适不过了，如果站在 C 的角度，则就是一个普普通通的字符数组，一条指令就是一个字符、或者说一个整数。 当然指令序列里面包含的不仅仅是指令，还有指令参数，因为每个指令都会带一个参数。因此索引为 0 2 4 6 8 ··· 的整数表示指令，索引为 1 3 5 7 9 ··· 的整数表示指令参数。 我们用 Python 来演示一下： code_string = \"\"\"\na = 1\nb = 2\nc = a + b\n\"\"\" code_object = compile(code_string, \"<file>\", \"exec\")\n# 查看常量池\nprint(code_object.co_consts)\n\"\"\"\n(1, 2, None)\n\"\"\"\n# 查看符号表\nprint(code_object.co_names)\n\"\"\"\n('a', 'b', 'c')\n\"\"\" 这些都比较简单，再来看一下反编译的结果，直接 dis.dis(code_object) 即可。 /* 常量池：(1, 2, None) * 符号表：('a', 'b', 'c') */ // 第一列表示源代码行号\n// 第二列表示指令的偏移量\n// 第三列表示指令，在 C 中它们都是宏，对应一个整数\n// 第四列表示指令参数\n// 第五列是 dis 模块为了方便我们阅读而补充的提示信息 // 指令：LOAD_CONST，指令参数：0\n// 表示从常量池中加载索引为 0 的常量，并压入运行时栈（关于运行时栈，一会儿详细说明）\n// 索引为 0 的常量显然是 1，而括号里面的提示信息显示的也是 1\n2 0 LOAD_CONST 0 (1)\n// 指令：STORE_NAME，指令参数：0\n// 表示从符号表中加载索引为 0 的符号，显然结果是 \"a\"\n// 然后弹出运行时栈的栈顶元素，显然是上一条指令压入的 1\n// 将 \"a\" 和 1 组成键值对，存储在当前的名字空间中\n// 到此 a = 1 这条语句便完成了，或者说完成了变量和值的绑定 2 STORE_NAME 0 (a) // 从常量池中加载索引为 1 的常量（结果是 2），并压入运行时栈 3 4 LOAD_CONST 1 (2)\n// 从符号表中加载索引为 1 的符号（结果是 \"b\")\n// 然后从栈顶弹出元素 2，将 \"b\" 和 2 绑定起来 6 STORE_NAME 1 (b) // 加载符号表中索引为 0 的符号对应的值，并压入运行时栈 4 8 LOAD_NAME 0 (a)\n// 加载符号表中索引为 1 的符号对应的值，并压入运行时栈 10 LOAD_NAME 1 (b)\n// 将运行时栈的两个元素弹出，并执行加法运算\n// 运算之后，再将结果 a + b 压入运行时栈 12 BINARY_ADD\n// 从符号表中加载索引为 2 的符号，结果是 \"c\" // 将运行时栈的栈顶元素弹出，这里是 a + b 的运算结果\n// 然后进行绑定，完成 c = a + b 这条赋值语句 14 STORE_NAME 2 (c)\n// 从常量池中加载索引为 2 的元素并返回，有一个隐式的 return None 16 LOAD_CONST 2 (None) 18 RETURN_VALUE 这些指令的源码实现后续都会说，但是不难发现，程序的主干逻辑都体现在字节码中，而依赖的信息则由其它字段来维护。所谓执行源代码，其实就是虚拟机执行编译之后的字节码，通过遍历 co_code，对不同的指令执行不同的逻辑。 然后我们基于上面这些输出信息，看看能否将字节码指令集还原出来，当然在还原之前首先要知道这些指令代表的数值是多少。 下面我们来进行还原。 \"\"\" 0 LOAD_CONST 0 (1) 2 STORE_NAME 0 (a) 4 LOAD_CONST 1 (2) 6 STORE_NAME 1 (b) 8 LOAD_NAME 0 (a)\n10 LOAD_NAME 1 (b)\n12 BINARY_ADD\n14 STORE_NAME 2 (c)\n16 LOAD_CONST 2 (None)\n18 RETURN_VALUE\n\"\"\"\nBINARY_ADD = 23\nRETURN_VALUE = 83\nSTORE_NAME = 90\nLOAD_CONST = 100\nLOAD_NAME = 101 codes = [ # a = 1 LOAD_CONST, 0, STORE_NAME, 0, # b = 2 LOAD_CONST, 1, STORE_NAME, 1, # c = a + b LOAD_NAME, 0, # 加载 a LOAD_NAME, 1, # 加载 b BINARY_ADD, 0, # 计算 a + b STORE_NAME, 2, # 和变量 c 绑定 # 所有代码块都隐式地包含了一个 return None LOAD_NAME, 2, RETURN_VALUE, 0\n]\nprint(bytes(codes))\n\"\"\"\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02e\\x02S\\x00'\n\"\"\" 那么字节码是不是我们还原的这个样子呢？来对比一下。 >>> code_object.co_code\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02d\\x02S\\x00' 结果是一样的，到此相信你对 Python 源代码的执行过程应该有更深的了解了，简单来讲，其实就是以下几个步骤。 1）源代码被编译成 PyCodeObject 对象，该对象的 co_code 字段指向字节码指令序列，它包含了程序执行的主干逻辑，剩余字段则保存常量池、符号表等其它静态信息。 2）虚拟机在 PyCodeObject 对象的基础上构建栈桢对象。 3）虚拟机在栈桢对象内部执行字节码（帧评估），具体流程就是遍历指令集和，根据不同指令执行不同的处理逻辑，而这一过程便由 _PyEval_EvalFrameDefault 函数负责完成。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 虚拟机的运行框架","id":"257","title":"虚拟机的运行框架"},"258":{"body":"之前一直提到一个概念，叫运行时栈，那什么是运行时栈呢？别急，我们先来回顾一下栈桢的基本结构。 大部分字段都很好理解，因为之前通过 Python 代码演示过。但有几个字段是虚拟机用于执行指令的，后续会遇到，所以这里再拿出来解释一下。 f_lasti 上一条刚执行完的字节码指令的偏移量，因为每个指令要带一个参数，所以当虚拟机要执行偏移量为 n 的指令时，那么 f_lasti 就是 n - 2。当然，如果字节码还没有开始执行，那么 f_lasti 为 -1。 f_localsplus 一个柔性数组，它的内存大小被分为 4 个部分。 注：f_localsplus 是一个数组，所以它是一段连续的内存，只不过按照用途被分成了 4 个部分。如果用新一团团长丁伟的说法：每个部分之间是鸡犬相闻，但又老死不相往来。 然后再着重强调一下运行时栈，虚拟机在执行字节码指令时高度依赖它，因为一个指令只能带一个参数，那么剩余的参数就必须通过运行时栈给出。比如 a = 1 会对应两条字节码：LOAD_CONST 和 STORE_NAME。 STORE_NAME 的作用是从符号表中获取符号，或者说变量名，然后和值绑定起来。而要加载符号，那么必须要知道它在符号表中的索引，显然这可以通过指令参数给出，但问题是与之绑定的值怎么获取？毫无疑问，要通过运行时栈。因此 LOAD_CONST 将值读取进来之后，还要压入运行时栈，然后 STORE_NAME 会将值从运行时栈中弹出，从而完成符号（变量）和值的绑定。 关于运行时栈，我们再看个复杂的例子： 偏移量为 6 的指令表示要构建一个字典，指令参数 2 表示构建的字典的长度为 2，但问题是字典的键值对在什么地方？显然它们已经被提前压入了运行时栈，执行 BUILD_CONST_KEY_MAP 的时候直接弹出即可。 所以这就是运行时栈的作用，如果某个指令需要 n 个参数，那么其中的 n - 1 个必须要提前压入运行时栈，然后在该指令执行的时候依次弹出，因为一个指令只能带一个参数。 f_stacktop 一个指针，指向运行时栈的栈顶。由于运行时栈存储的都是 PyObject *，所以 f_stacktop 的类型是 PyObject **。当然在源码中没有直接操作 f_stacktop 字段，而是定义了一个变量 stack_pointer，它初始等于 f_stacktop。后续操作的都是 stack_pointer，当然操作完之后，还要重新赋值给 f_stacktop。 所以 stack_pointer 始终指向运行时栈的栈顶，而元素的入栈和出栈，显然都是通过操作 stack_pointer 完成的。 执行 *stack_pointer++ = v，一个元素就入栈了。 执行 v = *--stack_pointer，一个元素就出栈了。 而随着元素的入栈和出栈，运行时栈的栈顶、或者说 stack_pointer 也在不断变化，但无论如何，stack_pointer 始终指向运行时栈的栈顶。当然啦，由于栈顶发生变化，后续还要对 f_stacktop 进行更新。 f_valuestack 一个指针，指向运行时栈的栈底。 另外我们说 f_localsplus 数组被分成了 4 份，最后一份给了运行时栈，因此虽然我们称之为栈，但它其实就是一个数组，而且还是数组的一部分。 而对于数组而言，内存地址从左往右是增大的。 这是 f_localsplus 的示意图，灰色区域表示运行时栈之前的部分，这里我们只看运行时栈，目前栈里面有两个元素，stack_pointer 指向栈顶。 这时如果要添加一个元素 3，那么直接 *stack_pointer++ = 3 即可。 如果要将栈顶元素弹出，那么执行 v = *--stack_pointer 即可。 还是比较清晰的，不过还没结束，我们还要继续探讨运行时栈。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 什么是运行时栈","id":"258","title":"什么是运行时栈"},"259":{"body":"相信你已经知道什么是运行时栈了，说白了它就是参数的容身之所，比如虚拟机在执行 a + b 的时候，通过指令和指令参数可以判断这是一个加法操作，但在执行加法的时候，加号两边的值要怎么获取呢？这时候就需要一个栈来专门保存相应的参数。在执行加法之前，先将 a 和 b 压入栈中，等执行加法的时候，再将 a 和 b 从栈里面弹出来即可，非常简单。 然后再来看看和运行时栈相关的一些宏，并加深对运行时栈的理解。 // Python/ceval.c #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))\n#define EMPTY() (STACK_LEVEL() == 0)\n#define TOP() (stack_pointer[-1])\n#define SECOND() (stack_pointer[-2])\n#define THIRD() (stack_pointer[-3])\n#define FOURTH() (stack_pointer[-4])\n#define PEEK(n) (stack_pointer[-(n)])\n#define SET_TOP(v) (stack_pointer[-1] = (v))\n#define SET_SECOND(v) (stack_pointer[-2] = (v))\n#define SET_THIRD(v) (stack_pointer[-3] = (v))\n#define SET_FOURTH(v) (stack_pointer[-4] = (v))\n#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))\n#define BASIC_STACKADJ(n) (stack_pointer += n)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v))\n#define BASIC_POP() (*--stack_pointer) #define PUSH(v) BASIC_PUSH(v)\n#define POP() BASIC_POP()\n#define STACK_GROW(n) BASIC_STACKADJ(n)\n#define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER)) 宏还是比较多的，我们来逐一介绍。假设目前运行时栈内部有三个元素，从栈底到栈顶分别是整数 1、2、3，那么运行时栈的结构就是下面这样。 f_localsplus 数组被分成 4 个区域，运行时栈占据最后一个，因此图中的灰色区域便是运行时栈之前的内存。由于我们是研究运行时栈，所以这部分区域后续就不再画了。 然后看一下这些和运行时栈相关的宏都是干嘛的。 STACK_LEVEL() 返回运行时栈的元素个数，显然直接让栈顶指针和栈底指针相减就完事了。 #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack)) 所以 STACK_LEVEL() 是会动态变化的，因为 stack_pointer 会动态变化。 记得之前在介绍 PyCodeObject 时，我们说它内部的 co_stacksize 字段表示执行代码块所需要的栈空间，而这个栈空间就是运行时栈的长度。当然也可以理解为要想执行这段代码块，后续创建栈桢时，应该给 f_localsplus 数组中表示运行时栈的区域分配能存储多少个元素的内存。 比如 co_stacksize 是 1，那么表示应该给运行时栈分配能存储 1 个元素的内存，即运行时栈的长度为 1。 STACK_LEVEL() 表示当前运行时栈已存储的元素数量，而 co_stacksize 表示运行时栈的长度，即最多能存储多少个元素。 我们通过反编译的方式，实际演示一下。 import dis def some_func(): a = 1 b = 2 c = 3 # 这里只保留字节码指令\ndis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 也就是说，运行时栈只要能容纳一个元素，即可执行这段代码\nprint(some_func.__code__.co_stacksize) # 1 我们再来看个例子。 import dis def some_func(): a = 1 b = 2 c = 3 lst = [a, b, c] dis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 1\nLOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 2 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 3\nBUILD_LIST # 将栈里的三个元素弹出，构建列表并入栈（此时元素个数为 1）\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 不难看出，要想执行这段代码，运行时栈要能容纳 3 个元素\nprint(some_func.__code__.co_stacksize) # 3 相信你现在应该理解 co_stacksize 的作用了，它表示运行时栈最多能容纳多少个元素，也就是运行时栈的长度。以上面代码为例，由于最多会压入 3 个元素，所以运行时栈的长度就是 3，即最多能容纳 3 个元素。并且这个长度在编译之后就已经确定了，因为可以通过遍历指令集静态计算出来。 我们画一张图描述一下上面的代码在执行时，运行时栈的变化过程。 整个过程应该很清晰，当然上面只是运行时栈的变化，f_localsplus 中存储局部变量的内存区域也在变化。另外如果代码块位于全局作用域，那么变化的就是全局名字空间，相关细节后续详细展开。 EMPTY() #define EMPTY() (STACK_LEVEL() == 0) 判断运行时栈是否为空，显然只需判断运行时栈的元素个数是否为 0 即可。 TOP() #define TOP() (stack_pointer[-1]) 查看当前运行时栈的栈顶元素。 SECOND() #define SECOND() (stack_pointer[-2]) 查看从栈顶元素开始的第二个元素。 THIRD() #define THIRD() (stack_pointer[-3]) 查看从栈顶元素开始的第三个元素。 FOURTH() #define FOURTH() (stack_pointer[-4]) 查看从栈顶元素开始的第四个元素。 PEEK(n) #define PEEK(n) (stack_pointer[-(n)]) 查看从栈顶元素开始的第 n 个元素。 SET_TOP(v) #define SET_TOP(v) (stack_pointer[-1] = (v)) 将当前运行时栈的栈顶元素设置成 v。 SET_SECOND(v) #define SET_SECOND(v) (stack_pointer[-2] = (v)) 将从栈顶元素开始的第二个元素设置成 v。 SET_THIRD(v) #define SET_THIRD(v) (stack_pointer[-3] = (v)) 将从栈顶元素开始的第三个元素设置成 v。 SET_FOURTH(v) #define SET_FOURTH(v) (stack_pointer[-4] = (v)) 将从栈顶元素开始的第四个元素设置成 v。 SET_VALUE(n, v) #define SET_VALUE(n, v) (stack_pointer[-(n)] = (v)) 将从栈顶元素开始的第 n 个元素设置成 v。 PUSH(v) #define PUSH(v) BASIC_PUSH(v)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v)) 往运行时栈中压入一个元素，并且压入之后，栈中已存储的元素个数一定不超过 co_stacksize。假设当前栈里有一个元素 1，然后添加一个元素 2。 Python 的变量都是一个指针，所以 stack_pointer 是一个二级指针，它永远指向栈顶位置，只不过栈顶位置会变。另外要注意：运行时栈的内存一开始就申请好了，初始状态下，里面的元素全部为 NULL。而往栈里面压入一个元素，其实就是修改 stack_pointer 指向的内存单元，然后执行 stack_pointer++。 POP() #define POP() BASIC_POP()\n#define BASIC_POP() (*--stack_pointer) 弹出栈顶元素，注意它和 TOP 的区别，TOP 是返回栈顶元素，但不弹出。 stack_pointer 指向栈顶位置，所以它向栈底移动一个位置，就相当于元素被弹出了。 关于弹出元素需要做一个说明，所谓弹出元素本质上就是将 stack_pointer 向栈底移动一个位置。我们看一下上图，一开始栈里面有两个元素，分别是整数 1 和整数 2，当然准确来说应该是指向它们的指针，但为了描述方便，我们就用对象本身代替了。 然后执行 POP()，将整数 2 弹出，但我们发现 POP() 之后，整数 2 还在栈里面。关于这一点很好理解，因为 stack_pointer 始终指向栈顶位置，而它向栈底移动了一个位置，那么整数 2 就已经不是栈顶元素了。当下一个元素入栈时，会把整数 2 替换掉。因此虽然整数 2 还在运行时栈里面，但和不在没有任何区别，此时我们依旧认为整数 2 被弹出了。 不过在后续的文章中，在画运行时栈的时候，我们也会这么画。 为了阅读清晰，stack_pointer 之后的元素就不写了。另外还要注意一点，运行时栈的内存一开始就已经申请好了，是固定的，弹出元素只是改变栈顶指针 stack_pointer 的指向，而内存区域的大小是不变的。 当然这些内容都比较简单，但为了避免出现歧义，这里单独解释一下。 STACK_GROW(n) #define STACK_GROW(n) BASIC_STACKADJ(n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 改变运行时栈的栈顶，注：运行时栈的大小是固定的，但栈顶是由 stack_pointer 决定的。 那么问题来了，假设要往运行时栈压入两个元素，分别是 2、3，该怎么做呢？首先肯定可以通过 PUSH 实现。 PUSH(2);\nPUSH(3); 但如果不让你用 PUSH，该怎么做呢？ STACK_GROW(2);\n// 设置元素\nSET_VALUE(1, 3); // stack_pointer[-1] = 3\nSET_VALUE(2, 2); // stack_pointer[-2] = 2 两种做法都是可以的。 STACK_SHRINK(n) #define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 它的作用和 STACK_GROWN 正好相反。 注意：STACK_SHRINK(3) 之后，stack_pointer 和 f_valuestack 都指向了运行时栈的栈底，同时也是栈顶。还是之前说的，栈空间是固定的，但栈顶会随着元素的入栈和出栈而动态变化。 另外，对于当前示例来说，如果你不关注栈里的元素的话，那么执行 STACK_SHRINK(3) 和执行三次 POP() 是等价的。当然不管是哪种情况，最终栈里的元素都还是 1、2、3，因为弹出元素只是改变栈顶指针 stack_pointer 的指向，而不会修改栈里的元素。当然啦，既然栈顶是由 stack_pointer 决定的，而它目前指向了栈底位置，所以我们可以认为此时栈是空的。 这么画似乎更清晰一些，但我们要知道这背后的整个过程。另外还要再次强调，运行时栈只是数组 f_localsplus 的一部分，并且是最后一部分，所以它的内存空间事先就申请好了，里面的每个元素都是 NULL。所谓添加元素，就是修改 stack_pointer 指针指向的内存，然后 stack_pointer++。所谓弹出元素，就是 stack_pointer--，然后返回 stack_pointer 指向的内存。 以上就是运行时栈的一些宏，后续阅读源码的时候，会经常遇到。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 运行时栈的一些宏","id":"259","title":"运行时栈的一些宏"},"26":{"body":"本篇文章来聊一聊对象的创建，一个对象是如何从无到有产生的呢？ >>> n = 123\n>>> n\n123 比如在终端中执行 n = 123，一个整数对象就创建好了，但它的背后都发生了什么呢？带着这些疑问，开始今天的内容。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"26","title":"楔子"},"260":{"body":"本篇文章我们就从宏观的角度介绍了虚拟机执行字节码的流程，说白了虚拟机就是把自己当成一个 CPU，在栈桢中执行指令。通过遍历字节码指令集，对不同的指令执行不同的处理逻辑。 然后是运行时栈，因为一个指令只能带一个参数，那么剩余的参数就需要通过运行时栈给出。比如 LOAD_CONST 指令，它在加载完常量之后，会将常量压入运行时栈，然后 STORE_NAME 或 STORE_FAST 指令再将常量从运行时栈的顶部弹出，并和某个符号（变量）绑定起来。 关于这些指令，我们后面会详细说。 最后我们介绍了运行时栈的一些宏，因为执行指令的时候会反复操作运行时栈，所以底层封装了很多的宏。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 小结","id":"260","title":"小结"},"261":{"body":"上一篇文章我们介绍了虚拟机是怎么执行字节码指令的，并且还介绍了运行时栈，以及操作运行时栈的一些宏。相信你对字节码执行的整个流程应该有了清晰的认识，那么接下来我们就深入到源码中，进一步考察执行过程。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 楔子","id":"261","title":"楔子"},"262":{"body":"之前说了，虚拟机就是把自己当成一个 CPU，在栈帧中执行字节码，面对不同的字节码指令，执行不同的处理逻辑。 具体实现由 Python/ceval.c 中的 _PyEval_EvalFrameDefault 函数负责，该函数超级长，并且里面还包含了大量的宏，这些宏完全可以定义在其它的文件中。像我们之前介绍的操作运行时栈的宏，也定义在 _PyEval_EvalFrameDefault 函数里面了。所以为了方便大家理解，我决定先介绍里面出现的宏，等宏说完了之后再看具体的逻辑。 #ifdef HAVE_COMPUTED_GOTOS #ifndef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 1 #endif\n#else #if defined(USE_COMPUTED_GOTOS) && USE_COMPUTED_GOTOS #error \"Computed gotos are not supported on this compiler.\" #endif #undef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 0\n#endif // 如果使用 \"计算跳转\"，导入静态跳转表\n#if USE_COMPUTED_GOTOS\n/* Import the static jump table */\n#include \"opcode_targets.h\" 里面出现了一个关键词：计算跳转，这是什么意思呢？ 首先 _PyEval_EvalFrameDefault（后续简称为帧评估函数）的代码量虽然很大，但它的核心不难理解，就是循环遍历字节码指令集，处理每一条指令。而当一条指令执行完毕时，虚拟机会有以下三种动作之一： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，比如执行 GET_ITER 指令，但对象不具备可迭代的性质。那么要进行异常处理（或者直接抛出异常），然后退出帧评估函数。 执行下一条指令。 前面两种动作没啥好说的，关键是第三种，如何执行下一条指令。首先虚拟机内部有一个巨型的 switch 语句，伪代码如下： int opcode;\nint oparg; for (;;) { // 循环遍历指令集，获取指令和指令参数 opcode = ...; // 指令 oparg = ...; // 指令参数 // 执行对应的处理逻辑 switch (opcode) { case LOAD_CONST: 处理逻辑; case LOAD_FAST: 处理逻辑; case LOAD_FAST: 处理逻辑; case BUILD_LIST: 处理逻辑; case DICT_UPDATE: 处理逻辑; // ... }\n} 一个 case 分支，对应一个字节码指令的实现，由于指令非常多，所以这个 switch 语句也非常庞大。然后遍历出的指令，会进入这个 switch 语句进行匹配，执行相应的处理逻辑。所以循环遍历 co_code 得到字节码指令，然后交给内部的 switch 语句、执行匹配到的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 其实到这里，你应该已经了解了帧评估函数的整体结构。说白了就是将自己当成一个 CPU，在栈帧中执行一条条指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。因此在虚拟机的执行流程进入了那个巨大的 for 循环，并取出第一条字节码指令交给里面的 switch 语句之后，第一张多米诺骨牌就已经被推倒，命运不可阻挡的降临了。一条接一条的指令如同潮水般涌来，浩浩荡荡，横无际涯。 虽然在概念上很好理解，但很多细节被忽略掉了，本篇文章就将它们深挖出来。还是之前的问题，当一个指令执行完毕时，怎么执行下一条指令。 估计有人对这个问题感到奇怪，在 case 分支的内部加一行 continue 进行下一轮循环不就行了吗？没错，这种做法是行得通的，但存在性能问题。因为 continue 会跳转到 for 循环所在位置，所以遍历出下一条指令之后，会再次进入 switch 语句进行匹配。尽管逻辑上是正确的，但 switch 里面有数百个 case 分支，如果每来一个指令，都要顺序匹配一遍的话，那么效率必然不高。 而事实上整个字节码指令集是已知的，所以不管执行哪个指令，我们都可以提前得知它的下一个指令，只需将指针向后偏移两个字节即可。 那么问题来了，既然知道下一条要执行的指令是什么，那么在当前指令执行完毕时，可不可以直接跳转到下一条指令对应的 case 分支中呢？ 答案是可以的，这个过程就叫做计算跳转，通过标签作为值即可实现。关于什么是标签作为值，我们用一段 C 代码解释一下。 #include <stdio.h> void label_as_value(int jump) { int num = 4; void *label; switch (num) { case 1: printf(\"%d\\n\", 1); break; // 在 case 2 分支里面定义了一个标签叫 two case 2: two: { printf(\"%d\\n\", 2); break; } // 在 case 3 分支里面定义了一个标签叫 three case 3: three: { printf(\"%d\\n\", 3); break; } case 4: printf(\"%d\\n\", 4); // 如果参数 jump 等于 2，保存 two 标签的地址 // 如果参数 jump 等于 3，保存 three 标签的地址 if (jump == 2) label = &&two; else if (jump == 3) label = &&three; // 跳转到指定标签 goto *label; default: break; }\n} int main() { label_as_value(2); // 4 // 2 label_as_value(3); // 4 // 3\n} 由于变量 num 等于 4，所以会进入 case 4 分支，在里面有一个 goto *label。如果你对 C 不是特别熟悉的话，估计会有些奇怪，觉得不应该是 goto label 吗？如果是 goto label，那么需要显式地定义一个名为 label 的标签，但这里并没有。我们的目的是跳转到 two 标签或 three 标签，具体跳转到哪一个，则由参数控制。因此可以使用 && 运算符，这是 GCC 的一个扩展特性，叫做标签作为值，它允许我们获取标签的地址作为一个值。 所以在开头声明了一个 void *label，然后让 label 保存标签地址，再通过 goto *label 跳转到指定标签。由于 *label 代表哪个标签是在运行时经过计算才能知晓，因此称为计算跳转（在运行时动态决定跳转目标）。 注意：goto *&&标签名 属于高级的、非标准的 C 语言用法。 那么毫无疑问，解释器也一定为处理指令的 case 分支定义了相应的标签，并拿到了这些标签的地址。没错，这些标签地址位于 Python/opcode_targets.h 中，这个 opcode_targets.h 就是上面的帧评估函数导入的头文件。 每个指令的处理逻辑都会对应一个标签，这些标签的地址全部保存在了数组中，执行帧评估函数时导入进来即可。这里可能有人会问，导入数组时，它里面的标签都还没有定义吧。确实如此，不过没关系，对于 C 来说，标签只要定义了，那么它在函数的任何一个位置都可以使用。 假设要执行的下一条指令为 opcode，那么就会跳转到 *opcode_targets[opcode]，因此我们有理由相信，指令和 opcode_targets 数组的索引之间存在某种关联。而这种关联也很好想，opcode_targets[opcode] 指向的标签，其内部的逻辑就是用来处理 opcode 指令的，我们来验证一下。 #define LOAD_CONST 100\n#define LOAD_NAME 101 比如 LOAD_CONST 的值为 100，那么 opcode_targets[100] 肯定会指向 TARGET_LOAD_CONST 标签；LOAD_NAME 的值为 101，那么 opcode_targets[101] 肯定会指向 TARGET_LOAD_NAME 标签。 结果没有问题，其它指令也是一样的，通过计算跳转，可以直接 goto 到指定的标签。 好，我们总结一下，首先帧评估函数内部有一个巨型的 switch，每一个指令的处理逻辑都对应一个 case 分支，由于指令有一百多个，所以 case 分支也有一百多个。而当指令进入 switch 后，显然会顺序匹配这一百多个 case 分支，找到符合条件的那一个。 整个过程的逻辑是没问题的，但效率上还可以更进一步优化，因为整个字节码指令集是已知的，既然都提前知道了下一条待处理的指令是什么，那完全可以直接跳转到对应的 case 分支中。所以每个 case 分支都会对应一个标签，我们看一下源码。 这个 TARGET 是一个宏，也定义在帧评估函数中。 #define TARGET(op) \\ op: \\ TARGET_##op // 所以 case TARGET(LOAD_CONST): 展开之后就会变成\n// case LOAD_CONST: TARGET_LOAD_CONST: 所以在指令的名称前加一个 TARGET_ 就是对应的标签，比如下一条要执行的指令是 YIELD_VALUE，它等于 86，那么 opcode_targets[86] 就等于 &&TARGET_YIELD_VALUE，指向的标签内部便是 YIELD_VALUE 的处理逻辑，至于其它指令也是同理。 因此读取完下一条指令之后，就不用跳转到开头重新走一遍 switch 了。而是将指令作为索引，从 opcode_targets 拿到标签地址直接跳转即可，并且跳转后的标签内部的逻辑就是用来处理该指令的。 所以底层为每个指令的处理逻辑都定义了一个标签，而标签的地址在数组中的索引，和要处理的指令本身是相等的。 不过要想实现计算跳转，需要 GCC 支持标签作为值这一特性，即 goto *标签地址，至于标签地址是哪一个标签的地址，则在运行时动态计算得出。比如 opcode_targets[opcode] 指向哪个标签无从得知，这取决于 opcode 的值。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 以上就是计算跳转，我们继续往下说。 // 如果使用了计算跳转\n#define FAST_DISPATCH() \\ { \\ if (!_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \\ f->f_lasti = INSTR_OFFSET(); /* 将当前指令的偏移量赋值给 f_lasti */ \\ NEXTOPARG(); /* 获取下一条指令 */ \\ goto *opcode_targets[opcode]; /* 跳转到对应的标签中 */ \\ } \\ goto fast_next_opcode; \\ } #define DISPATCH() \\ { \\ if (!_Py_atomic_load_relaxed(eval_breaker)) { \\ FAST_DISPATCH(); \\ } \\ continue; \\ } #define TARGET(op) \\ op: \\ TARGET_##op // 如果不使用计算跳转\n#define TARGET(op) op\n#define FAST_DISPATCH() goto fast_next_opcode\n#define DISPATCH() continue 每条指令在执行的最后，都会调用 DISPATCH() 或 FAST_DISPATCH()，我们看一下源码。 如果不使用计算跳转，那么 DISPATCH() 就等价于 continue，直接进行下一轮 for 循环，然后进入 switch。而 FAST_DISPATCH() 会跳转到 fast_next_opcode 标签，该标签定义在 for 循环的里面，switch 的外面，所以它虽然不用从 for 循环的位置开始执行，但依然要走一遍完整的 switch。另外由于不使用计算跳转，那么 case 分支里的标签也就没意义了，所以 case TARGET(op) 就等价于 case op。 如果使用计算跳转，那么就是之前说的那样，在指令执行完之后（并且没有中断请求）会调用 NEXTOPARG() 获取下一条指令，然后通过 goto *opcode_targets[opcode] 实现计算跳转，直接跳到下一条指令对应的 case 分支中，从而省去了匹配的时间。 好，我们继续往下看。 // 获取元组 v 中索引为 i 的元素\n#define GETITEM(v, i) PyTuple_GetItem((v), (i)) /* 在遍历字节码指令序列时，会用到以下两个变量 * first_instr：永远指向字节码指令序列的第一条指令 * next_instr：永远指向下一条待执行（或正在执行）的字节码指令 * 另外由于每条字节码指令都会带有一个参数 * 所以 first_instr 和 next_instr 的类型都是 _Py_CODEUNIT *，即 uint16_t * * 其中前 8 位表示指令，后 8 位表示指令参数 */ // 在调用 NEXTOPARG() 之前，next_instr 指向正在执行的字节码指令\n// 如果调用了 NEXTOPARG()，那么 next_instr 就会指向下一条待执行的字节码指令\n// 该宏计算的显然就是它和第一条指令（或者说字节码指令序列的起始位置）之间的偏移量\n#define INSTR_OFFSET() \\ (sizeof(_Py_CODEUNIT) * (int)(next_instr - first_instr)) // 获取 next_instr 指向的 uint16 的前 8 位和后 8 位，也就是拿到指令和指令参数\n// 然后执行 next_instr++\n#define NEXTOPARG() do { \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ } while (0) 通过 INSTR_OFFSET 和 NEXTOPARG，我们介绍了两个指针变量：first_instr 和 next_instr，虚拟机就是通过它们来完成遍历的。 #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个指令等到介绍 if 控制流的时候再说，不过相信你也能猜到它是做什么的，if 控制流的某个分支如果不满足条件，就会跳到下一个分支。而这个跳转过程是怎么实现的呢？显然要借助于这里的 JUMPTO 和 JUMPBY。 // 指令预测\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif\n#define PREDICTED(op) PRED_##op: PREDICT 宏和指令预测相关，后续介绍 if 控制流的时候再说。 关于宏就说到这里，至于剩下的一些宏，暂时就先不用看了，我们在后续的部分才会用到它们。 好，既然宏说完了，接下来我们可以看整个帧评估函数都做些什么了，代码有删减。 PyObject* _Py_HOT_FUNCTION\n_PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)\n{ // 初始化一些变量，它们的含义等赋值的时候再说 PyObject **stack_pointer; const _Py_CODEUNIT *next_instr; int opcode; int oparg; PyObject **fastlocals, **freevars; PyObject *retval = NULL; _PyRuntimeState * const runtime = &_PyRuntime; PyThreadState * const tstate = _PyRuntimeState_GetThreadState(runtime); struct _ceval_runtime_state * const ceval = &runtime->ceval; _Py_atomic_int * const eval_breaker = &ceval->eval_breaker; PyCodeObject *co; int instr_ub = -1, instr_lb = 0, instr_prev = -1; const _Py_CODEUNIT *first_instr; PyObject *names; PyObject *consts; _PyOpcache *co_opcache; // ... // 省略了一堆的宏定义，就是我们上面刚介绍的 // ... // 检查是否超过递归深度限制 if (Py_EnterRecursiveCall(\"\")) return NULL; // tstate->frame 保存当前正在执行的栈桢，所以将 f 赋值给 tstate->frame // 至于之前的 tstate->frame，则保存在 f.f_back 字段中（在创建栈桢 f 的时候就完成了） tstate->frame = f; // 如果启用追踪机制 if (tstate->use_tracing) { // tstate->c_tracefunc 对应 Python 里的 sys.settrace // 如果不为空，那么进行调用 // 该函数可以监控每行代码的执行，因此一般用于调试器 if (tstate->c_tracefunc != NULL) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } // tstate->c_profilefunc 对应 Python 里的 sys.setprofile // 如果不为空，那么进行调用，该函数主要用于性能分析 if (tstate->c_profilefunc != NULL) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } } // DTrace 是一个强大的动态追踪工具 // 这里检测是否启用了 DTrace 的函数入口探针 if (PyDTrace_FUNCTION_ENTRY_ENABLED()) // 如果启用了 DTrace，则记录函数进入的事件 dtrace_function_entry(f); // 获取栈桢内部的关键字段 co = f->f_code; names = co->co_names; consts = co->co_consts; fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; assert(PyBytes_Check(co->co_code)); assert(PyBytes_GET_SIZE(co->co_code) <= INT_MAX); assert(PyBytes_GET_SIZE(co->co_code) % sizeof(_Py_CODEUNIT) == 0); assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(co->co_code), sizeof(_Py_CODEUNIT))); // 注意这里的 first_instr，上面已经介绍了，它指向字节码指令序列的起始位置，或者说第一条指令 first_instr = (_Py_CODEUNIT *) PyBytes_AS_STRING(co->co_code); assert(f->f_lasti >= -1); // 初始状态下，next_instr 和 first_instr 相等 next_instr = first_instr; if (f->f_lasti >= 0) { assert(f->f_lasti % sizeof(_Py_CODEUNIT) == 0); next_instr += f->f_lasti / sizeof(_Py_CODEUNIT) + 1; } stack_pointer = f->f_stacktop; assert(stack_pointer != NULL); f->f_stacktop = NULL; f->f_executing = 1; // 进入主循环，在这个 for 循环里面一会儿就会看到那个巨型的 switch main_loop: // 遍历字节码指令集，处理每一条指令 for (;;) { // stack_pointer 是栈顶指针，f_valuestack 是栈底指针 // 由于 Python 的运行时栈是基于数组实现的，所以从栈底到栈顶，地址是增大的 // 因此 stack_pointer 一定大于等于 f_valuestack assert(stack_pointer >= f->f_valuestack); // STACK_LEVEL() 一定小于等于运行时栈的长度，之前说过的 assert(STACK_LEVEL() <= co->co_stacksize); // 线程状态对象里面没有异常产生 assert(!_PyErr_Occurred(tstate)); // 检测是否有待处理的中断（比如信号、GIL 释放请求等） if (_Py_atomic_load_relaxed(eval_breaker)) { opcode = _Py_OPCODE(*next_instr); /* 如果指令是以下之一，那么忽略中断，直接跳到 fast_next_opcode 标签进行处理 * SETUP_FINALLY：try / finally 语句的开始 * SETUP_WITH：with 语句的开始 * BEFORE_ASYNC_WITH：async with 语句的开始 * YIELD_FROM：yield from 表达式 */ // 这种设计主要是为了确保在某些关键操作（如资源管理、异常处理、异步操作）的开始阶段不被中断信号打断 // 从而保证这些操作的正确性和可靠性，进而保证 Python 程序的稳定性和可预测性 if (opcode == SETUP_FINALLY || opcode == SETUP_WITH || opcode == BEFORE_ASYNC_WITH || opcode == YIELD_FROM) { goto fast_next_opcode; } // 使用原子操作检查是否有待处理的信号 // 如果有待处理的信号，那么调用 handle_signals 函数处理它们 // 这个机制允许 Python 程序响应外部事件和系统信号，同时保证执行的正确性 if (_Py_atomic_load_relaxed(&ceval->signals_pending)) { if (handle_signals(runtime) != 0) { goto error; } } // 通过原子操作检查是否有待处理的调用需要执行，calls_to_do 是一个计数器，表示待处理的调用的数量 // 如果有待处理的调用，那么执行 make_pending_calls 函数 // pending calls 主要用于垃圾回收（GC）、异步 IO 回调、定时器事件等 // 这个机制是 Python 运行时系统的重要组成部分，允许虚拟机在主循环中处理各种异步任务和周期性任务 // 确保各种后台任务能够得到及时处理，并且不需要使用额外的线程和复杂的调度机制 if (_Py_atomic_load_relaxed(&ceval->pending.calls_to_do)) { if (make_pending_calls(runtime) != 0) { goto error; } } // 通过原子操作检查是否有释放 GIL 的请求，如果有，那么该线程就要释放 GIL if (_Py_atomic_load_relaxed(&ceval->gil_drop_request)) { // 将当前线程状态设置为 NULL，因为要发生切换了（关于 GIL，后续会单独介绍） if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) { Py_FatalError(\"ceval: tstate mix-up\"); } // 释放 GIL，给其它线程一个机会，不能让某一个线程一直霸占着 // 如果开启了多线程，那么当释放 GIL 的那一刻，就会被其它线程获取 drop_gil(ceval, tstate); // GIL 释放之后，还要再次获取，但 GIL 已经被其它线程拿走了 // 所以会触发操作系统内核的线程调度机制，进入阻塞状态，等待 GIL 再度回到自己手中 // 因此不难发现，如果有 n 个线程，那么其中的 n - 1 个会陷入阻塞，等待获取 GIL // 而一旦持有 GIL 的线程执行了 drop_gil 函数，将 GIL 释放了 // 那么这 n - 1 个线程当中就会有一个线程拿到 GIL 并解除阻塞，然后开始执行字节码 // 至于释放 GIL 的线程，则会尝试再次获取 GIL，但会因为获取不到而陷入阻塞（已经被其它线程拿走了） take_gil(ceval, tstate); // 检查是否需要快速退出线程（比如在解释器关闭时） exit_thread_if_finalizing(runtime, tstate); // 到这里说明 take_gil 返回了（即阻塞状态解除），也意味着拿到了 GIL，那么要恢复线程状态 if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) { Py_FatalError(\"ceval: orphan tstate\"); } } // 检测线程状态中是否存在异步的异常 if (tstate->async_exc != NULL) { PyObject *exc = tstate->async_exc; tstate->async_exc = NULL; UNSIGNAL_ASYNC_EXC(ceval); _PyErr_SetNone(tstate, exc); Py_DECREF(exc); goto error; } } // 以上是一些中断检测逻辑，如果执行顺利，那么会走到这里 fast_next_opcode: // 保存上一条已执行完毕的字节码的偏移量 f->f_lasti = INSTR_OFFSET(); // 如果启用了 DTrace 行追踪，那么记录行级别的执行信息 if (PyDTrace_LINE_ENABLED()) maybe_dtrace_line(f, &instr_lb, &instr_ub, &instr_prev); // 检查是否需要执行行级追踪，如果追踪功能可用并且设置了追踪函数，那么执行 // 这是 Python 调试和性能分析功能的核心部分，使得像 pdb 这样的调试器能够逐行执行代码 if (_Py_TracingPossible(ceval) && tstate->c_tracefunc != NULL && !tstate->tracing) { int err; // 保存当前栈指针 f->f_stacktop = stack_pointer; // 调用行追踪函数 err = maybe_call_line_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, &instr_lb, &instr_ub, &instr_prev); // 追踪函数可能改变帧的状态，需要重新加载，并更新栈指针 JUMPTO(f->f_lasti); if (f->f_stacktop != NULL) { stack_pointer = f->f_stacktop; f->f_stacktop = NULL; } if (err) goto error; } // 这个宏前面介绍了，它会获取下一条待处理的指令和指令参数 NEXTOPARG(); // 进入 dispatch_opcode 标签 dispatch_opcode: // 下面这些宏主要用于指令追踪和性能分析，简单了解一下就好\n#ifdef DYNAMIC_EXECUTION_PROFILE // 如果启用了动态执行性能分析\n#ifdef DXPAIRS // 如果启用了指令对分析 dxpairs[lastopcode][opcode]++; // 记录相邻指令对的出现次数 lastopcode = opcode; // 更新上一个指令\n#endif dxp[opcode]++; // 记录单个指令的执行次数\n#endif #ifdef LLTRACE // 如果启用了低级追踪，并且追踪开关打开，那么打印偏移量、指令、指令参数等信息 if (lltrace) { if (HAS_ARG(opcode)) { printf(\"%d: %d, %d\\n\", f->f_lasti, opcode, oparg); } else { printf(\"%d: %d\\n\", f->f_lasti, opcode); } }\n#endif // 好的，关键来了，我们终于来到了这个巨型的 switch // 一个指令对应一个 case 分支，里面包含了该指令的处理逻辑 // 因为有一百多个 case 分支，所以这个 switch 语句的代码量高达 2300 多行 // 当然啦，也仅仅只是代码量大，但逻辑很单纯，就是定义了一百多条指令的处理逻辑嘛 switch (opcode) { // NOP 指令的处理逻辑，另外还记得这个 TARGET 宏吗？如果开启了计算跳转，那么分支内部还会定义一个标签 // 此时 case TARGET(NOP) 会展开成 case NOP: TARGET_NOP: case TARGET(NOP): { FAST_DISPATCH(); } // LOAD_FAST 指令的处理逻辑 case TARGET(LOAD_FAST): { PyObject *value = GETLOCAL(oparg); if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // LOAD_CONST 指令的处理逻辑 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); PyObject *value = GETITEM(consts, oparg); Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // STORE_FAST 指令的处理逻辑 case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); PyObject *value = POP(); SETLOCAL(oparg, value); FAST_DISPATCH(); } // POP_TOP 指令的处理逻辑 case TARGET(POP_TOP): { PyObject *value = POP(); Py_DECREF(value); FAST_DISPATCH(); } // ... // ... // ... // MAKE_FUNCTION 指令的处理逻辑 case TARGET(MAKE_FUNCTION): { // ... PUSH((PyObject *)func); DISPATCH(); } // BUILD_SLICE 指令的处理逻辑 case TARGET(BUILD_SLICE): { // ... if (slice == NULL) goto error; DISPATCH(); } // FORMAT_VALUE 指令的处理逻辑 case TARGET(FORMAT_VALUE): { // ... DISPATCH(); } // EXTENDED_ARG 指令的处理逻辑 case TARGET(EXTENDED_ARG): { int oldoparg = oparg; NEXTOPARG(); oparg |= oldoparg << 8; goto dispatch_opcode; } /* 这些指令内部的具体逻辑，我们后续会聊 */ // 如果执行到这里，说明上面的 case 分支都没有匹配到，意味着出现了一个未知的指令 // 那么打印错误信息：unknown opcde，不过基本不会发生，除非你刻意构造一个不存在的指令\n#if USE_COMPUTED_GOTOS _unknown_opcode:\n#endif default: fprintf(stderr, \"XXX lineno: %d, opcode: %d\\n\", PyFrame_GetLineNumber(f), opcode); _PyErr_SetString(tstate, PyExc_SystemError, \"unknown opcode\"); goto error; } // 到这里，switch 语句块就结束了 // 这个位置永远不可能到达，因为在每条指令的处理逻辑的最后，要么调用 DISPATCH()，要么 goto error // 调用 DISPATCH() 会去执行下一条指令，goto error 会跳转到下面的 error 标签 // 当然这里的 Py_UNREACHABLE() 有没有都无所谓，但加上之后会让程序显得更加严谨 Py_UNREACHABLE(); // 如果字节码指令在执行时出错了，那么会设置异常，然后跳转到 error 标签\nerror:\n// 以下是错误处理的防御性代码，用于确保在发生错误时总是设置了适当的异常 // 记得之前介绍过异常的本质，其实就是解释器内部在执行时发现逻辑出问题了（比如索引超出范围）\n// 那么会将异常（比如 IndexError）设置在回溯栈中，并立即返回一个表示错误的哨兵值\n// 当解释器将返回值传递给 Python 时，会发现返回值为 NULL，知道出异常了\n// 于是会将回溯栈里的异常输出到 stderr 当中，就是我们在终端中看到的那一坨红色的东西，然后结束进程\n// 但如果解释器发现回溯栈里面没有异常，那么会额外设置一个 SystemError: error return without exception set\n// 意思就是：\"明明发生错误了，为什么回溯栈里面没有设置异常呢？\"，一般这个问题会在用 C 编写扩展模块的时候遇到 #ifdef NDEBUG if (!_PyErr_Occurred(tstate)) { _PyErr_SetString(tstate, PyExc_SystemError, \"error return without exception set\"); }\n#else // 当然如果没有定义 NDEBUG 宏的话，那么就会展开成一个 assert 断言 // 对于解释器本身来说，像这种 assert 断言都是成立的，否则底层源码写的就有问题 assert(_PyErr_Occurred(tstate));\n#endif // 报错时，要生成 traceback，即回溯栈，关于 traceback，等介绍异常捕获的时候再说 PyTraceBack_Here(f); // 执行追踪函数，用于调试器捕获异常、追踪异常、以及异常处理的监控和分析等 // 在使用 pdb 调试器时，这个机制允许调试器捕获和显示异常信息 if (tstate->c_tracefunc != NULL) call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); // 这里和异常捕获相关，我们后续再聊 exception_unwind: while (f->f_iblock > 0) { // ... } break; } // 到这里，外层的 for 循环就结束了，显然会有两种情况 // 要么字节码都执行完毕了，要么出异常了，但不管是哪种，都意味着要退出栈桢了 assert(retval == NULL); assert(_PyErr_Occurred(tstate)); // 到这里说明要退出栈桢了，如果运行时栈里面还有元素的话，那么要清空\nexit_returning: while (!EMPTY()) { PyObject *o = POP(); Py_XDECREF(o); } // 生成器在 yield 时的追踪处理逻辑\n// 另外像这些追踪函数可以不用太关注，都是用于调试和性能分析的\nexit_yielding: if (tstate->use_tracing) { if (tstate->c_tracefunc) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } if (tstate->c_profilefunc) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } } // 帧评估函数退出时的清理代码\nexit_eval_frame: // 如果启用了 DTrace，记录函数返回事件 if (PyDTrace_FUNCTION_RETURN_ENABLED()) dtrace_function_return(f); // 退出递归调用，与之前的 Py_EnterRecursiveCall() 相对应 Py_LeaveRecursiveCall(); // 标记帧不再处于执行状态 f->f_executing = 0; // 当调用一个函数时，会在当前帧的基础上创建新的帧，并将执行权交给新的帧 // 当函数执行完毕时，会销毁栈桢，并将执行权还给上一级栈帧（即调用者的帧），这个过程叫做栈桢回退 // 显然这里要将 f->back 赋值给 tstate->frame，即回退到上一级栈桢 tstate->frame = f->f_back; // 检查返回值的有效性，确保返回值符合 Python 的调用约定 return _Py_CheckFunctionResult(NULL, retval, \"PyEval_EvalFrameEx\"); } 以上就是帧评估函数的源码逻辑，总的来说并不难理解，其核心就是通过 for 循环遍历字节码指令集，将遍历出的指令交给内部的 switch 语句，执行对应的 case 分支。当匹配到的 case 分支执行完毕时，会有以下三种情况： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，跳转到 error 标签，然后进行异常处理（或者直接抛出异常）。 执行下一条指令，如果开启了计算跳转，那么会精确跳转到下一条指令的处理逻辑中，否则会跳转到 fast_next_opcode 标签的所在位置、或者 for 循环的所在位置。但不管如何，虚拟机接下来的动作就是获取下一条字节码指令和指令参数，完成对下一条指令的执行。 所以通过 for 循环一条一条遍历 co_code 中的字节码指令，然后交给内部的 switch 语句、执行对应的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 相信到此刻你已经彻底了解了 Python 执行引擎的整体结构。说白了虚拟机就是将自己当成一个 CPU，在栈帧中一条条的执行指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 源码解析字节码指令的执行过程","id":"262","title":"源码解析字节码指令的执行过程"},"263":{"body":"光看源码还是有点枯燥的，下面我们来写一段简单的代码，然后反编译，并通过画图来演示虚拟机是如何执行字节码的。 code = \"\"\"\\\nchinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3\n\"\"\" # 将上面的代码以模块的方式进行编译\nco = compile(code, \"my_module\", \"exec\")\n# 查看常量池\nprint(co.co_consts) # (89, 99, 91, 3, None)\n# 查看符号表\nprint(co.co_names) # ('chinese', 'math', 'english', 'avg') 在编译的时候，常量和符号（变量）都会被静态收集起来。然后我们反编译一下看看字节码，直接通过 dis.dis(co) 即可，结果如下： 1 0 LOAD_CONST 0 (89) 2 STORE_NAME 0 (chinese) 2 4 LOAD_CONST 1 (99) 6 STORE_NAME 1 (math) 3 8 LOAD_CONST 2 (91) 10 STORE_NAME 2 (english) 4 12 LOAD_NAME 0 (chinese) 14 LOAD_NAME 1 (math) 16 BINARY_ADD 18 LOAD_NAME 2 (english) 20 BINARY_ADD 22 LOAD_CONST 3 (3) 24 BINARY_TRUE_DIVIDE 26 STORE_NAME 3 (avg) 28 LOAD_CONST 4 (None) 30 RETURN_VALUE 上面每一列的含义之前说过，这里再重复一下。 第一列是源代码的行号； 第二列是指令的偏移量，或者说该指令在整个字节码指令序列中的索引。因为每条指令后面都跟着一个参数，所以偏移量是 0 2 4 6 8 ...； 第三列是字节码指令，简称指令，它们在宏定义中代表整数； 第四列是字节码指令参数，简称指令参数、或者参数，不同的指令参数的含义不同； 第五列是 dis 模块给我们额外提供的信息，一会儿说； 我们从上到下依次解释每条指令都干了什么？ 0 LOAD_CONST：表示加载一个常量（指针），并压入运行时栈。后面的指令参数 0 表示从常量池中加载索引为 0 的常量，至于 89 则表示加载的常量是 89。所以最后面的括号里面的内容实际上起到的是一个提示作用，告诉你加载的对象是什么。 2 STORE_NAME：表示将 LOAD_CONST 加载的常量用一个名字绑定起来，放在所在的名字空间中。后面的 0 (chinese) 则表示使用符号表中索引为 0 的名字（符号），且名字为 \"chinese\"。 所以像 chinese = 89 这种简单的赋值语句，会对应两条字节码指令。 然后 4 LOAD_CONST、6 STORE_NAME 和 8 LOAD_CONST、10 STORE_NAME 的作用显然和上面是一样的，都是加载一个常量，然后将某个符号和常量绑定起来，并放在名字空间中。 12 LOAD_NAME：加载一个变量，并压入运行时栈，而后面的 0 (chinese) 表示加载符号表中索引为 0 的变量的值，然后这个变量叫 chinese。14 LOAD_NAME 也是同理，将符号表中索引为 1 的变量的值压入运行时栈，并且变量叫 math。此时栈里面有两个元素，从栈底到栈顶分别是 chinese 和 math。 16 BINARY_ADD：将上面两个变量从运行时栈弹出，然后执行加法操作，并将结果压入运行时栈。 18 LOAD_NAME：将符号表中索引为 2 的变量 english 的值压入运行时栈，此时栈里面有两个元素，从栈底到栈顶分别是 chinese + math 的返回结果和 english。 20 BINARY_ADD：将运行时栈里的两个元素弹出，然后执行加法操作，并将结果压入运行时栈。此时栈里面有一个元素，就是 chinese + math + english 的返回结果。 22 LOAD_CONST：将常量 3 压入运行时栈，此时栈里面有两个元素； 24 BINARY_TRUE_DIVIDE：将运行时栈里的两个元素弹出，然后执行除法操作，并将结果压入运行时栈，此时栈里面有一个元素； 26 STORE_NAME：将元素从运行时栈里面弹出，并用符号表中索引为 3 的变量 avg 和它绑定起来，然后放在名字空间中。 28 LOAD_CONST：将常量 None 压入运行时栈，然后通过 30 RETURN_VALUE 将其从栈中弹出、并返回。 所以 Python 虚拟机就是把自己想象成一个 CPU，在栈帧中一条条执行字节码指令，当指令执行完毕或执行出错时，停止执行。 我们通过几张图展示一下上面的过程，为了阅读方便，这里将相应的源代码再贴一份。 chinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3 之前说了，模块也有自己的作用域，并且是全局作用域，所以虚拟机也会为它创建栈帧。而在代码还没有执行的时候，栈帧就已经创建好了，整个布局如下。 f_localsplus 下面的箭头方向，代表运行时栈从栈底到栈顶的方向。 这里再强调一下 f_localsplus 字段，它是一个柔性数组。虽然声明的时候写着长度为 1，但实际使用时，长度不受限制，和 Go 语言不同，C 数组的长度不属于类型的一部分。然后 f_localsplus 在逻辑上被分成了四份，分别用于局部变量、cell 变量、free 变量、运行时栈，由于当前示例中的代码是以模块的方式编译的，里面所有的变量都是全局变量，而且也不涉及闭包啥的，所以这里就把 f_localsplus 理解为运行时栈即可。 接下来就开始执行字节码了，next_instr 指向下一条待执行的字节码指令，显然初始状态下，下一条待执行的指令就是第一条指令。 于是虚拟机开始执行 0 LOAD_CONST，该指令表示将常量加载进运行时栈，而要加载的常量在常量池中的索引，由指令参数表示。 在源码中，指令对应的变量是 opcode，指令参数对应的变量是 oparg。 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); // 调用元组的 GETITEM 方法，从常量池中加载索引为 oparg 的对象 // 当然啦，为了描述方便我们称之为对象，但其实是指向对象的指针 PyObject *value = GETITEM(consts, oparg); // 增加引用计数 Py_INCREF(value); // 压入运行时栈 PUSH(value); FAST_DISPATCH();\n} 该指令的参数为 0，所以会将常量池中索引为 0 的元素 89 压入运行时栈，执行完之后，栈帧的布局就变成了下面这样： 接着虚拟机执行 2 STORE_NAME 指令，从符号表中获取索引为 0 的符号、即 chinese。然后将栈顶元素 89 弹出，再将符号 chinese 和整数对象 89 绑定起来保存到 local 名字空间中。 case TARGET(STORE_NAME): { // 从符号表中加载索引为 oparg 的符号 // 符号本质上就是一个 PyUnicodeObject 对象 // 这里就是字符串 \"chinese\" PyObject *name = GETITEM(names, oparg); // 从运行时栈的栈顶弹出元素 // 显然是上一步压入的 89 PyObject *v = POP(); // 获取名字空间 namespace PyObject *ns = f->f_locals; int err; // 如果没有名字空间则报错，设置异常 if (ns == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals found when storing %R\", name); Py_DECREF(v); goto error; } // 将符号和对象绑定起来放在 ns 中 // 名字空间是一个字典，PyDict_CheckExact 负责检测 ns 是否为字典，等价于 type(ns) is dict // 除此之外，还有 PyDict_Check(ns)，它等价于 isinstance(ns, dict) if (PyDict_CheckExact(ns)) // 通过字典的特定类型 API 将键值对 \"chinese\": 89 设置到字典中 err = PyDict_SetItem(ns, name, v); else // 走到这里说明 type(ns) 不是 dict，那么它应该继承 dict // 通过泛型 API 设置元素 err = PyObject_SetItem(ns, name, v); // 对象的引用计数减 1，因为从运行时栈中弹出了 Py_DECREF(v); // 如果 err != 0，证明设置元素出错了，跳转至 error 标签 if (err != 0) goto error; // 调用 DISPATCH() 执行下一条指令，如果没有开启计算跳转，那么它就相当于一个 continue DISPATCH();\n} 执行完之后，栈帧的布局就变成了下面这样： 此时运行时栈为空，local 名字空间多了个键值对。 同理剩余的两个赋值语句也是类似的，只不过指令参数不同，比如 6 STORE_NAME 加载的是符号表中索引为 1 的符号，10 STORE_NAME 加载的是符号表中索引为 2 的符号，分别是 math 和 english。它们执行完之后，栈桢布局如下： 然后 12 LOAD_NAME 和 14 LOAD_NAME 负责将符号表中索引为 0 和 1 的变量的值压入运行时栈： case TARGET(LOAD_NAME): { // 从符号表 co_names 中加载索引为 oparg 的变量（符号） // 但是注意：全局变量是通过字典存储的 // 所以这里的 name 只是一个字符串罢了，比如 \"chinese\" // 然后还要再根据这个字符串从字典里面查找对应的 value PyObject *name = GETITEM(names, oparg); // 对于模块来说，f->f_locals 和 f->f_globals 指向同一个字典 PyObject *locals = f->f_locals; PyObject *v; // local 名字空间一定不为 NULL if (locals == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals when loading %R\", name); goto error; } // 如果 type(locals) is dict 为真 if (PyDict_CheckExact(locals)) { // 根据 name 获取 value，所以 print(chinese) 本质上就是下面这样 // print(locals[\"chinese\"]) v = PyDict_GetItemWithError(locals, name); if (v != NULL) { Py_INCREF(v); } else if (_PyErr_Occurred(tstate)) { goto error; } } // 否则说明 type(locals) is dict 为假，但 isinstance(locals, dict) 为真 else { // 通过泛型 API 获取元素 v = PyObject_GetItem(locals, name); if (v == NULL) { if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) goto error; _PyErr_Clear(tstate); } } // 如果 v 等于 NULL，说明 local 空间不存在 if (v == NULL) { // 那么从全局名字空间（global 名字空间）获取 v = PyDict_GetItemWithError(f->f_globals, name); // 如果 v 不等于 NULL，说明获取到了 if (v != NULL) { Py_INCREF(v); } // 否则说明 global 空间也不存在指定的 key // 这里检测一下是否有异常产生，有的话跳转到 error 标签 else if (_PyErr_Occurred(tstate)) { goto error; } // local 空间和 global 空间都没有，那么该去 builtin 空间查找了 else { // 逻辑和上面是类似的，如果查找不到，跳转到 error 标签，否则增加引用计数 if (PyDict_CheckExact(f->f_builtins)) { v = PyDict_GetItemWithError(f->f_builtins, name); if (v == NULL) { if (!_PyErr_Occurred(tstate)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } Py_INCREF(v); } else { v = PyObject_GetItem(f->f_builtins, name); if (v == NULL) { if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } } } } // 压入运行时栈 PUSH(v); DISPATCH();\n} 上面两条指令执行完之后，栈帧的布局就变成了下面这样： 接下来执行 16 BINARY_ADD，它会将栈里的两个元素弹出，然后执行加法操作，最后再将结果入栈。 当然上面这种说法是为了方便理解，其实虚拟机真正执行的时候，只会弹出一个元素，而另一个元素只是使用 TOP() 进行查看，但不弹出。等结果计算完毕之后，再将栈顶元素替换掉。 所以本质上，和弹出两个元素、再将计算结果入栈是一样的。 case TARGET(BINARY_ADD): { // 从栈顶弹出元素，这里是 99（变量 math） PyObject *right = POP(); // math 弹出之后，chinese 就成为了新的栈顶元素 // 这里的 TOP() 则是获取栈顶元素 89（变量 chinese） PyObject *left = TOP(); // 用于保存两者的和 PyObject *sum; // 如果是字符串，执行专门的函数 if (PyUnicode_CheckExact(left) && PyUnicode_CheckExact(right)) { sum = unicode_concatenate(tstate, left, right, f, next_instr); } // 否则通过泛型 API 进行计算 else { sum = PyNumber_Add(left, right); Py_DECREF(left); } // 减少元素的引用计数 Py_DECREF(right); // 将栈顶元素替换成 sum SET_TOP(sum); if (sum == NULL) goto error; DISPATCH();\n} BINARY_ADD 指令执行完之后，栈帧的布局就变成了下面这样： 然后 18 LOAD_NAME 负责将符号表中索引为 2 的变量 english 的值压入运行时栈，而指令 20 BINARY_ADD 则是继续执行加法操作，并将结果设置在栈顶，然后 22 LOAD_CONST 将常量 3 再压入运行时栈。 这三条指令执行之后，运行时栈的变化如下： 接着是 24 BINARY_TRUE_DIVIDE，它的逻辑和 BINARY_ADD 类似，只不过一个执行除法，一个执行加法。 case TARGET(BINARY_TRUE_DIVIDE): { // 从栈顶弹出元素，显然是 3 PyObject *divisor = POP(); // 查看栈顶元素，此时栈顶元素变成了 279 PyObject *dividend = TOP(); // 调用 PyNumber_TrueDivide，执行 279 / 3 PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); // 减少引用计数 Py_DECREF(dividend); Py_DECREF(divisor); // 将栈顶元素替换成 279 / 3 的计算结果 SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} 当 24 BINARY_TRUE_DIVIDE 执行完之后，运行时栈如下： 然后 26 STORE_NAME 将栈顶元素 93.0 弹出，并将符号表中索引为 3 的变量 avg 和它绑定起来，放到名字空间中。因此最终栈帧关系图如下： 以上就是虚拟机对这几行代码的执行流程，整个过程就像 CPU 执行指令一样。 我们再用 Python 代码描述一遍上面的逻辑： # LOAD_CONST 将 89 压入栈中，STORE_NAME 将 89 从栈中弹出\n# 并将符号 \"chinese\" 和 89 绑定起来，放在名字空间中\nchinese = 89\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89} math = 99\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99} english = 91\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91} avg = (chinese + math + english) / 3\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91, 'avg': 93.0} 现在你是不是对虚拟机执行字节码有更深的了解了呢？当然字节码指令非常多，不止我们上面看到的那几个。你可以随便写一些代码，然后分析一下它的字节码指令是什么。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 通过反编译查看字节码","id":"263","title":"通过反编译查看字节码"},"264":{"body":"到此，我们就深入源码，考察了虚拟机执行字节码的流程，帧评估函数虽然很长，也有那么一些复杂，但是核心逻辑不难理解。就是把自己当成一个 CPU，在栈帧中执行字节码指令。 下一篇文章我们来介绍一下常见的几个指令，并探讨不同的变量赋值语句的背后原理。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 小结","id":"264","title":"小结"},"265":{"body":"前面我们剖析了字节码的执行流程，本来应该接着介绍一些常见指令的，但因为有几个指令涉及到了局部变量，所以我们单独拿出来说。与此同时，我们还要再度考察一下 local 名字空间，它的背后还隐藏了很多内容。 我们知道函数的参数和函数内部定义的变量都属于局部变量，均是通过静态方式访问的。 x = 123 def foo1(): global x a = 1 b = 2 # co_nlocals 会返回局部变量的个数\n# a 和 b 是局部变量，x 是全局变量，因此是 2\nprint(foo1.__code__.co_nlocals) # 2 def foo2(a, b): pass print(foo2.__code__.co_nlocals) # 2 def foo3(a, b): a = 1 b = 2 c = 3 print(foo3.__code__.co_nlocals) # 3 无论是参数还是内部新创建的变量，本质上都是局部变量。 按照之前的理解，当访问一个全局变量时，会去访问 global 名字空间（也叫全局名字空间）。 那么问题来了，当操作函数的局部变量时，是不是也等价于操作其内部的 local 名字空间（局部名字空间）呢？我们往下看。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 楔子","id":"265","title":"楔子"},"266":{"body":"之前我们说过 Python 变量的访问是有规则的，会按照本地、闭包、全局、内置的顺序去查找，也就是 LEGB 规则，所以在查找变量时，local 名字空间应该是第一选择。 但不幸的是，虚拟机在为调用的函数创建栈帧对象时，这个至关重要的 local 名字空间并没有被创建。因为栈帧的 f_locals 字段和 f_globals 字段分别指向了局部名字空间和全局名字空间，而创建栈帧时 f_locals 被初始化成了 NULL，所以并没有创建局部名字空间。这里可能有人会有疑问，因为印象之中函数是有 local 空间的吧。 import inspect # 模块的栈帧\nframe = inspect.currentframe()\n# 对于模块而言，局部名字空间和全局名字空间是同一个字典\nprint(frame.f_locals is frame.f_globals) # True\n# 当然啦，局部名字空间和全局名字空间也可以通过内置函数获取\nprint( frame.f_locals is locals() is frame.f_globals is globals()\n) # True # 但对于函数而言就不一样了\ndef foo(): name = \"古明地觉\" return inspect.currentframe() frame = foo()\n# global 名字空间全局唯一\n# 无论是获取栈帧的 f_globals，还是调用 globals()，得到的都是同一份字典\nprint(frame.f_globals is globals()) # True\n# 但每个函数都有自己独立的局部名字空间\nprint(frame.f_locals) # {'name': '古明地觉'} # 咦，不是说局部名字空间被初始化为 NULL 吗？\n# 那么在 Python 里面获取的话，结果应该是个 None 才对啊\n# 关于这一点，我们稍后会解释 总之对于函数而言，在创建栈帧时，它的 f_locals 被初始化为 NULL。那么问题来了，局部变量到底存储在什么地方呢？当然，由于变量只是一个名字（符号），而局部变量的名字都存储在符号表中，所以更严谨的说法是，局部变量的值存储在什么地方？ 在介绍虚拟机执行字节码的时候我们说过，当函数被调用时，虚拟机会为其创建一个栈帧。栈帧是虚拟机的执行环境，包含了执行时所依赖的上下文，而栈帧内部有一个字段叫 f_localsplus，它是一个数组。 这个数组虽然是一段连续内存，但在逻辑上被分成了 4 份，其中局部变量便存储在 f_localsplus 的第一份空间中。现在我们明白了，局部变量是静态存储在数组中的。 我们举个例子。 def foo(a, b): c = a + b print(c) 它的字节码如下： // 加载局部变量 a，压入运行时栈\n2 0 LOAD_FAST 0 (a) // 加载局部变量 b，压入运行时栈 2 LOAD_FAST 1 (b) // 将 a 和 b 从栈中弹出，然后做加法运算，再将结果压入栈中 4 BINARY_ADD // 加载符号 c，弹出栈顶元素（a + b 的运算结果） // 然后将两者绑定起来，完成赋值语句 c = a + b 6 STORE_FAST 2 (c) // 加载变量 print，优先从 global 空间中加载 // 如果 global 空间里面没有，那么再从 builtin 空间中加载\n3 8 LOAD_GLOBAL 0 (print) // 加载局部变量 c 10 LOAD_FAST 2 (c) // 执行 print(c)，并将返回值压入栈中，print 的返回值是 None 12 CALL_FUNCTION 1 // 弹出栈顶的返回值，因为没有用变量保存，所以会直接丢弃 14 POP_TOP // 隐式的 return None 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 注意里面的 LOAD_FAST 和 STORE_FAST，这两个指令对应的逻辑如下。 case TARGET(LOAD_FAST): { // 通过宏 GETLOCAL 获取局部变量的值 PyObject *value = GETLOCAL(oparg); // 如果值为 NULL，抛出 UnboundLocalError if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } // 增加引用计数并压入运行时栈 Py_INCREF(value); PUSH(value); FAST_DISPATCH();\n} case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); // 获取栈顶元素 PyObject *value = POP(); // 通过宏 SETLOCAL 创建局部变量 SETLOCAL(oparg, value); FAST_DISPATCH();\n} 所以 LOAD_FAST 和 STORE_FAST 分别负责加载和创建局部变量，而核心就是里面的两个宏：GETLOCAL、SETLOCAL，这两个宏也是定义在帧评估函数里面的。 // Python/ceval.c // 在帧评估函数中，fastlocals 会被赋值为 f->f_localsplus\n#define GETLOCAL(i) (fastlocals[i]) #define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \\ GETLOCAL(i) = value; \\ Py_XDECREF(tmp); } while (0)\n/* 这里额外再补充一个关于 C 语言的知识点 * 我们看到宏 SETLOCAL 展开之后的结果是 do {...} while (0) * do while 循环会先执行 do 里面的循环体，然后再判断条件是否满足 * 因此从效果上来说，执行 do {...} while (0) 和直接执行 ... 是等价的 * 那么问题来了，既然效果等价，为啥还要再套一层 do while 呢 * 其实原因很简单，如果宏在展开之后会生成多条语句，那么这些语句要成为一个整体 * 另外由于 C 程序的语句要以分号结尾，所以在调用宏时，我们也会习惯性地在结尾加上分号 * 因此我们希望有这样一种结构，能同时满足以下要求： * 1）可以将多条语句包裹起来，作为一个整体； * 2）程序的语义不能发生改变； * 3）在语法上，要以分号结尾； * 显然 do while 完美满足以上三个要求，只需将 while 里的条件设置为 0 即可 * 并且当编译器看到 while (0) 时，也会进行优化，去掉不必要的循环控制结构 * 因此以后看到 do {...} while (0) 时，不要觉得奇怪，这是宏的一个常用技巧 */ 我们看到操作局部变量，就是在基于索引操作数组 f_localsplus，显然这个过程比操作字典要快。尽管字典是经过高度优化的，但显然再怎么优化，也不可能快过数组的静态操作。 所以此时我们对局部变量的藏身之处已经了然于心，它们就存放在栈帧的 f_localsplus 字段中，而之所以没有使用 local 名字空间的原因也很简单。因为函数内部的局部变量在编译时就已经确定了，个数是不会变的，因此编译时也能确定局部变量占用的内存大小，以及访问局部变量的字节码指令应该如何访问内存。 def foo(a, b): c = a + b print(c) print( foo.__code__.co_varnames\n) # ('a', 'b', 'c') 比如变量 c 位于符号表中索引为 2 的位置，这在编译时就已确定。 当创建变量 c 时，只需修改数组 f_localsplus 中索引为 2 的元素即可。 当访问变量 c 时，只需获取数组 f_localsplus 中索引为 2 的元素即可。 这个过程是基于数组索引实现的静态查找，所以操作局部变量和操作全局变量有着异曲同工之妙。操作全局变量本质上是基于 key 操作字典的 value，其中 key 是变量的名称，value 是变量的值；而操作局部变量本质上是基于索引操作数组 f_localsplus 的元素，这个索引就是变量名在符号表中的索引，对应的数组元素就是变量的值。 所以我们说 Python 的变量其实就是个名字，或者说符号，到这里是不是更加深刻地感受到了呢？ 但对于局部变量来说，如果想实现静态查找，显然要满足一个前提：变量名在符号表中的索引和与之绑定的值在 f_localsplus 中的索引必须是一致的。毫无疑问，两者肯定是一致的，并且索引是多少在编译阶段便已经确定，会作为指令参数保存在字节码指令序列中。 好，到此可以得出结论，虽然虚拟机为函数实现了 local 名字空间（初始为 NULL），但在操作局部变量时却没有使用它，原因就是为了更高的效率。当然还有所谓的 LEGB，都说变量查找会遵循这个规则，但我们心里清楚，局部变量其实是静态访问的，不过完全可以按照 LEGB 的方式来理解。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 如何访问（创建）一个局部变量","id":"266","title":"如何访问（创建）一个局部变量"},"267":{"body":"先来看一下全局名字空间： x = 1 def foo(): globals()[\"x\"] = 2 foo()\nprint(x) # 2 global 空间全局唯一，在 Python 层面上就是一个字典，在任何地方操作该字典，都相当于操作全局变量，即使是在函数内部。因此在执行完 foo() 之后，全局变量 x 就被修改了。但 local 名字空间也是如此吗？我们尝试一下。 def foo(): x = 1 locals()[\"x\"] = 2 print(x) foo() # 1 我们按照相同的套路，却并没有成功，这是为什么？原因就是上面解释的那样，函数内部有哪些局部变量在编译时就已经确定了，查询的时候是从数组 f_localsplus 中静态查找的，而不是从 local 名字空间中查找。 然后我们打印一下 local 名字空间，看看里面都有哪些内容。 def foo(): name = \"satori\" print(locals()) age = 17 print(locals()) gender = \"female\" print(locals()) foo()\n\"\"\"\n{'name': 'satori'}\n{'name': 'satori', 'age': 17}\n{'name': 'satori', 'age': 17, 'gender': 'female'}\n\"\"\" 我们看到打印 locals() 居然也会显示内部的局部变量，相信聪明如你已经猜到 locals() 是怎么回事了。符号表里面存储了局部变量的符号（或者说名字），f_localsplus 里面存储了局部变量的值，当执行 locals() 的时候，会基于符号表和 f_localsplus 创建一个字典出来。 def foo(): name = \"satori\" age = 17 gender = \"female\" print(locals()) # 符号表：保存了函数中创建的局部变量的名字\nprint(foo.__code__.co_varnames)\n\"\"\"\n('name', 'age', 'gender')\n\"\"\"\n# 调用函数时会创建栈帧，局部变量的值都保存在 f_localsplus 里面\n# 并且符号表中变量名的顺序和 f_localsplus 中变量值的顺序是一致的\nf_localsplus = [\"satori\", 17, \"female\"]\n# 这里就用一个列表来模拟了 我们来看一下变量的创建。 由于符号 name 位于符号表中索引为 0 的位置，那么执行 name = \"satori\" 时，就会将 \"satori\" 放在 f_localsplus 中索引为 0 的位置。 由于符号 age 位于符号表中索引为 1 的位置，那么执行 age = 17 时，就会将 17 放在 f_localsplus 中索引为 1 的位置。 由于符号 gender 位于符号表中索引为 2 的位置，那么执行 gender = \"female\" 时，就会将 \"female\" 放在 f_localsplus 中索引为 2 的位置。 后续在访问变量的时候，比如访问变量 age，由于它位于符号表中索引为 1 的位置，那么就会通过 f_localsplus[1] 获取它的值，这些符号对应的索引都是在编译阶段确定的。所以在运行时才能实现静态查找，指令 LOAD_FAST 和 STORE_FAST 都是基于索引来静态操作底层数组。 我们用一张图来描述这个过程： 符号表负责存储局部变量的名字，f_localsplus 负责存储局部变量的值（里面的元素初始为 NULL），而在给局部变量赋值的时候，本质上就是将值写在了 f_localsplus 中。并且变量名在符号表中的索引，和变量值在 f_localsplus 中的索引是一致的，因此操作局部变量本质上就是在操作 f_localsplus 数组。至于 locals() 或者说局部名字空间，它是基于符号表和 f_localsplus 动态创建的，为了方便我们获取已存在的局部变量，执行 locals() 会临时创建一个字典（只会创建一次）。 所以我们通过 locals() 获取局部名字空间之后，访问里面的局部变量是可以的，只不过此时将静态访问变成了动态访问。 def foo(): name = \"satori\" # 会从 f_localsplus 中静态查找 print(name) # 先基于已有的变量和值创建一个字典 # 然后通过字典实现变量的动态查找 print(locals()[\"name\"]) foo()\n\"\"\"\nsatori\nsatori\n\"\"\" 两种方式都是可以的，但基于 locals() 来访问，在效率上明显会低一些。 另外基于 locals() 访问一个变量是可以的，但无法创建一个变量。 def foo(): name = \"satori\" locals()[\"age\"] = 17 try: print(age) except NameError as e: print(e) foo()\n\"\"\"\nname 'age' is not defined\n\"\"\" 局部变量是静态存储在数组里的，locals() 只是做了一个拷贝而已。往局部名字空间里面添加一个键值对，不等于创建一个局部变量，因为局部变量不是从它这里查找的，因此代码中打印 age 报错了。但如果外部还有一个全局变量 age 的话，那么会打印全局变量 age。 然后再补充一点，我们说全局名字空间在任何地方都是唯一的，而对于函数而言，它的局部名字空间在整个函数内部也是唯一的。不管调用 locals 多少次，拿到的都是同一个字典。 def foo(): name = \"satori\" # 执行 locals() 的时候，内部只有一个键值对 d = locals() print(d) # {'name': 'satori'} # 再次获取，此时有两个键值对 print(locals()) # {'name': 'satori', 'd': {...}} # 但两者的 id 相同，因为一个函数只有一个局部名字空间 # 不管调用多少次 locals()，拿到的都是同一个字典 print(id(d) == id(locals())) # True foo() 所以 locals() 和 globals() 指向的名字空间都是唯一的，只不过 locals() 是在某个函数内部唯一，而 globals() 在所有地方都唯一。 因此局部名字空间初始为 NULL，但在第一次执行 locals() 时，会以符号表中的符号作为 key，f_localsplus 中的值作为 value，创建一个字典作为函数的局部名字空间。而后续再执行 locals() 的时候，由于名字空间已存在，就不会再次创建了，直接基于当前的局部变量对字典进行更新即可。 def foo(): # 创建一个字典，由于当前还没有定义局部变量，因此是空字典 print(locals()) # {} # 往局部名字空间添加一个键值对 locals()[\"a\"] = \"b\" print(locals()) # {'a': 'b'} # 定义一个局部变量 name = \"satori\" # 由于局部名字空间已存在，因此不会再次创建 # 直接将局部变量的名字作为 key、值作为 value，拷贝到字典中 print(locals()) # {'a': 'b', 'name': 'satori'} foo() 注意：虽然局部名字空间里面存在 \"a\" 这个 key，但 a 这个局部变量是不存在的。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 解密 local 名字空间","id":"267","title":"解密 local 名字空间"},"268":{"body":"目前我们已经知道 local 名字空间是怎么创建的了，也熟悉了它的特性，下面通过源码来看一下它的构建过程。 // Python/bltinmodule.c static PyObject *\nbuiltin_locals_impl(PyObject *module)\n{ PyObject *d; // Python 内置函数的源码实现位于 bltinmodule.c 中 // 这里又调用了 PyEval_GetLocals d = PyEval_GetLocals(); Py_XINCREF(d); return d;\n} // Python/ceval.c\nPyObject *\nPyEval_GetLocals(void)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); // 拿到当前栈桢 PyFrameObject *current_frame = _PyEval_GetFrame(tstate); if (current_frame == NULL) { _PyErr_SetString(tstate, PyExc_SystemError, \"frame does not exist\"); return NULL; } // 调用 PyFrame_FastToLocalsWithError 创建 local 名字空间 // 并赋值给 current_frame->f_locals if (PyFrame_FastToLocalsWithError(current_frame) < 0) { return NULL; } assert(current_frame->f_locals != NULL); // 返回 current_frame->f_locals return current_frame->f_locals;\n} // Objects/frameobject.c\nint\nPyFrame_FastToLocalsWithError(PyFrameObject *f)\n{ PyObject *locals, *map; PyObject **fast; PyCodeObject *co; Py_ssize_t j; Py_ssize_t ncells, nfreevars; // 栈桢不能为空 if (f == NULL) { PyErr_BadInternalCall(); return -1; } // 获取局部名字空间 locals = f->f_locals; // 如果为 NULL，那么创建一个新字典，作为名字空间 // 所以局部名字空间只会创建一次，后续不会再创建 if (locals == NULL) { locals = f->f_locals = PyDict_New(); if (locals == NULL) return -1; } // 获取 PyCodeObject 对象 co = f->f_code; // 拿到内部的符号表（一个元组），里面保存了函数局部变量的名字 map = co->co_varnames; if (!PyTuple_Check(map)) { PyErr_Format(PyExc_SystemError, \"co_varnames must be a tuple, not %s\", Py_TYPE(map)->tp_name); return -1; } // 获取 f_localsplus，它里面保存了局部变量的值 // 只不过除了局部变量的值之外，还保存了其它的 fast = f->f_localsplus; // 那么 f_localsplus 里面到底有多少个局部变量的值呢？显然这要基于符号表来判断 // co_varnames 里面保存了多少个符号，f_localsplus 里面就保存了多少个局部变量的值 j = PyTuple_GET_SIZE(map); if (j > co->co_nlocals) // 理论上符号表的长度和局部变量的个数（co_nlocals）是相等的 // 但如果超过了 co_nlocals，那么让它等于 co_nlocals j = co->co_nlocals; // 如果 co_nlocals 大于 0，证明存在局部变量，那么调用 map_to_dict // 将 co_varnames 和 f_localsplus 里的元素组成键值对，添加到局部名字空间中 if (co->co_nlocals) { // 相当于 locals.update(zip(co_varnames, f_localsplus)) if (map_to_dict(map, j, locals, fast, 0) < 0) return -1; } // 如果里面有 cell 变量和 free 变量的话，也会添加到局部名字空间中 // 关于 cell 变量和 free 变量，由于它们和闭包相关，所以等介绍闭包的时候再说 ncells = PyTuple_GET_SIZE(co->co_cellvars); nfreevars = PyTuple_GET_SIZE(co->co_freevars); if (ncells || nfreevars) { if (map_to_dict(co->co_cellvars, ncells, locals, fast + co->co_nlocals, 1)) return -1; if (co->co_flags & CO_OPTIMIZED) { if (map_to_dict(co->co_freevars, nfreevars, locals, fast + co->co_nlocals + ncells, 1) < 0) return -1; } } return 0;\n} 可以看到，源码的实现逻辑和我们之前分析的是一样的。 变量 map 是符号表 co_varnames，保存了局部变量的名字； 变量 fast 是 f_localsplus，保存了局部变量的值； 变量 j 是局部变量的个数； 变量 locals 是局部名字空间； 然后将它们作为参数，传递给 map_to_dict 函数，该函数内部会进行遍历，按照顺序将变量名和变量值依次添加到局部名字空间中。然后我们再来看一下 map_to_dict 函数，它内部有一处细节非常之关键。 // Objects/frameobject.c static int\nmap_to_dict(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values, int deref)\n{ Py_ssize_t j; assert(PyTuple_Check(map)); assert(PyDict_Check(dict)); assert(PyTuple_Size(map) >= nmap); // nmap 表示局部变量的个数 for (j=0; j < nmap; j++) { // 从符号表中获取符号（变量名） PyObject *key = PyTuple_GET_ITEM(map, j); // values 就是 f_localsplus，然后获取变量的值 PyObject *value = values[j]; assert(PyUnicode_Check(key)); // 闭包变量相关，等介绍闭包的时候再说，由于当前不存在闭包，所以先忽略掉 if (deref && value != NULL) { assert(PyCell_Check(value)); value = PyCell_GET(value); } // 注意这一步：检测 value 是否等于 NULL，那么问题来了，什么时候 value 会等于 NULL 呢？ // 之前说了，局部变量有哪些在编译的时候就确定了，保存在符号表中，局部变量的值保存在 f_localsplus 中 // 在局部变量还没有赋值的时候，它在 f_localsplus 中对应的值就是 NULL // 而给一个局部变量赋值，本质上就是在修改 f_localsplus // 假设一个函数的符号表为 (\"a\", \"b\", \"c\")，在给变量 c 赋值之前调用了 locals() // 那么在获取变量 c 对应的值时，拿到的就是一个 NULL if (value == NULL) { // 如果某个符号对应的值为 NULL，则说明在获取名字空间时，该变量还没有被赋值 // 那么当该符号在 local 空间中已存在时，还要将它删掉。这一步非常关键，它的作用我们稍后会说 if (PyObject_DelItem(dict, key) != 0) { if (PyErr_ExceptionMatches(PyExc_KeyError)) PyErr_Clear(); else return -1; } } // 如果 value 不等于 NULL，说明变量已经完成了和某个值的绑定，于是将它们组成键值对拷贝到 local 空间中 else { if (PyObject_SetItem(dict, key, value) != 0) return -1; } } return 0;\n} 以上就是 local 名字空间的获取过程在源码层面的体现。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间的创建过程","id":"268","title":"local 名字空间的创建过程"},"269":{"body":"我们再来搭配 exec 关键字，结果会更加明显。首先 exec 函数可以将一段字符串当成代码来执行，并将执行结果体现在当前的名字空间中。 def foo(): print(locals()) # {} exec(\"x = 1\") print(locals()) # {'x': 1} try: print(x) except NameError as e: print(e) # name 'x' is not defined foo() 尽管 locals() 变了，但是依旧访问不到 x，因为虚拟机并不知道 exec(\"x = 1\") 是创建一个局部变量，它只知道这是一个函数调用。 事实上 exec 会作为一个独立的编译单元来执行，并且有自己的作用域。 所以 exec(\"x = 1\") 执行完之后，效果就是改变了局部名字空间，里面多了一个 \"x\": 1 键值对。但关键的是，局部变量 x 不是从局部名字空间中查找的，exec 终究还是错付了人。而由于函数 foo 对应的 PyCodeObject 对象的符号表中并没有 x 这个符号，所以报错了。 补充：exec 默认影响的是 local 名字空间，如果在执行时发现 local 名字空间为 NULL，那么会自动创建一个。所以调用 exec 也可以创建名字空间（当它为 NULL 时）。 exec(\"x = 1\")\nprint(x) # 1 如果放在模块里面是可以的，因为模块的 local 名字空间和 global 名字空间指向同一个字典，所以 global 名字空间会多一个 key 为 \"x\" 的键值对。而全局变量是从 global 名字空间中查找的，所以这里没有问题。 def foo(): # 此时 exec 影响的是 global 名字空间 exec(\"x = 123\", globals()) # 所以这里不会报错, 但此时的 x 不是局部变量, 而是全局变量 print(x) foo()\nprint(x)\n\"\"\"\n123\n123\n\"\"\" 可以给 exec 指定要影响的名字空间，代码中 exec 影响的是全局名字空间，打印的 x 也是全局变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间与 exec 函数","id":"269","title":"local 名字空间与 exec 函数"},"27":{"body":"前面我们介绍了 Python 对象在底层的数据结构，知道了 Python 底层是通过 PyObject 实现了对象的多态。所以我们先来分析一下 Python 为什么慢？ 在 Python 中创建一个对象，会分配内存并进行初始化，然后用一个 PyObject * 指针来维护这个对象，当然所有对象都是如此。因为指针是可以相互转化的，所以变量在保存一个对象的指针时，会将指针转成 PyObject * 之后再交给变量保存。 因此在 Python 中，变量的传递（包括函数的参数传递）实际上传递的都是泛型指针 PyObject *。这个指针具体指向什么类型的对象我们并不知道，只能通过其内部的 ob_type 字段进行动态判断，而正是因为这个 ob_type，Python 实现了多态机制。 比如 a.pop()，我们不知道 a 指向的对象是什么类型，它可能是列表、也可能是字典，或者是我们实现了 pop 方法的自定义类的实例对象。至于它到底是什么类型，只能通过 ob_type 动态判断。 如果 a 的 ob_type 为 &PyList_Type，那么 a 指向的对象就是列表，于是会调用 list 类型中定义的 pop 操作。如果 a 的 ob_type 为 &PyDict_Type，那么 a 指向的对象就是字典，于是会调用 dict 类型中定义的 pop 操作。所以变量 a 在不同的情况下，会表现出不同的行为，这正是 Python 多态的核心所在。 再比如列表，它内部的元素也都是 PyObject *，因为类型要保持一致，所以对象的指针不能直接存（因为类型不同），而是需要统一转成泛型指针 PyObject * 之后才可以存储。当我们通过索引获取到该指针进行操作的时候，也会先通过 ob_type 判断它的类型，看它是否支持指定的操作。所以操作容器内的某个元素，和操作一个变量并无本质上的区别，它们都是 PyObject *。 从这里我们也能看出 Python 为什么慢了，因为有一部分时间浪费在类型和属性的查找上面。 以变量 a + b 为例，这个 a 和 b 指向的对象可以是整数、浮点数、字符串、列表、元组、以及实现了 __add__ 方法的类的实例对象。因为 Python 的变量都是 PyObject *，所以它可以指向任意的对象，这就意味着 Python 无法做基于类型的优化。 底层在执行 a + b 时，首先要通过 ob_type 判断变量指向的对象是什么类型，这在 C 的层面需要一次属性查找。然后 Python 将每一个算术操作都抽象成了一个魔法方法，所以实例相加时要在类型对象中找到该方法对应的函数指针，这又是一次属性查找。找到了之后将 a、b 作为参数传递进去，这会产生一次函数调用，将对象维护的值拿出来进行运算，然后根据相加的结果创建一个新的对象，再将新的对象的指针转成 PyObject * 之后返回。 所以一个简单的加法运算，Python 内部居然做了这么多的工作，要是再放到循环里面，那么上面的步骤要重复 N 次。而对于 C 来讲，由于已经规定好了类型，所以 a + b 在编译之后就是一条简单的机器指令，因此两者在效率上差别很大。 当然我们不是来吐槽 Python 效率的问题，因为任何语言都有擅长的一面和不擅长的一面，这里只是通过回顾前面的知识来解释为什么 Python 效率低。因此当别人问你 Python 为什么效率低的时候，希望你能从这个角度来回答它，主要就两点： Python 无法基于类型做优化； Python 对象基本都存储在堆上； 建议不要一上来就谈 GIL，那是在多线程情况下才需要考虑的问题。而且我相信大部分觉得 Python 慢的人，都不是因为 Python 无法利用多核才觉得慢的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 为什么这么慢","id":"27","title":"Python 为什么这么慢"},"270":{"body":"我们说 exec 的执行效果会体现在 local 名字空间中，但是需要考虑变量名冲突的问题。举个例子： def foo(): exec(\"x = 1\") print(locals()[\"x\"]) foo()\n\"\"\"\n1\n\"\"\" def bar(): exec(\"x = 1\") print(locals()[\"x\"]) x = 123 bar()\n\"\"\"\nTraceback (most recent call last): File ..... bar() File ..... print(locals()[\"x\"])\nKeyError: 'x'\n\"\"\" 这是什么情况？函数 bar 只是多了一行赋值语句，为啥就报错了呢？要想搞懂这个问题，首先要明确两点： 1）函数的局部变量在编译的时候就已经确定，并存储在对应的 PyCodeObject 对象的符号表 (co_varnames) 中，这是由语法规则所决定的； 2）函数内的局部变量在其整个作用域范围内都是可见的； 对于 foo 函数来说，exec 执行完之后相当于往 local 名字空间中添加一个键值对，这没有问题。对于 bar 函数而言也是如此，在执行完 exec(\"x = 1\") 之后，local 名字空间中也会存在 \"x\": 1 这个键值对，但下面执行 locals() 的时候又把字典更新了。因为局部变量可以在函数的任意位置创建，或者修改，所以每一次执行 locals() 的时候，都会遍历符号表和 f_localsplus，组成键值对将原来的字典更新一遍。 在 bar 函数里面有一行 x = 123，所以知道函数里面存在局部变量 x，符号表里面也会有 \"x\" 这个符号，这是在编译时就确定的。但我们是在 x = 123 之前调用的 locals，所以此时符号 x 在 f_localsplus 中对应的值还是一个 NULL，没有指向一个合法的 PyObject。换句话说就是，知道里面存在局部变量 x，但是还没有来得及赋值。 然后在更新名字空间的时候，如果发现值是个 NULL，那么就把名字空间中该变量对应的键值对给删掉。 我们回顾一下 map_to_dict 函数： 所以 bar 函数执行 locals()[\"x\"] 的时候，会先获取名字空间，原本里面是有 \"x\": 1 这个键值对的。但因为赋值语句 x = 123 的存在，导致符号表里面存在 \"x\" 这个符号，但执行 locals() 的时候又尚未完成赋值，所以值为 NULL，于是又把这个键值对给删掉了。所以执行 locals()[\"x\"] 的时候，出现了 KeyError。 因为局部名字空间体现的是局部变量的值，而调用 locals 的时候，局部变量 x 还没有被创建。所以 locals() 里面不应该存在 key 为 \"x\" 的键值对，于是会将它删除。 我们将名字空间打印一下： def foo(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 但当前不存在局部变量，所以名字空间仍是 {\"x\": 1} print(locals()) def bar(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 由于里面存在局部变量 x，但尚未赋值 # 于是将字典中 key 为 \"x\" 的键值对给删掉 # 所以名字空间变成了 {} print(locals()) x = 123 foo() # {'x': 1}\nbar() # {} 上面代码中，局部变量的创建发生在 exec 之后，如果发生在 exec 之前也是相同的结果。 def foo(): exec(\"x = 2\") print(locals()) foo() # {'x': 2} def bar(): x = 1 exec(\"x = 2\") print(locals()) bar() # {'x': 1} 在 exec(\"x = 2\") 执行之后，名字空间也变成了 {\"x\": 2}。但从源码中我们看到，每次调用 locals，都会遍历符号表和 f_localsplus，对字典进行更新，所以在 bar 函数里面获取名字空间的时候，又把 \"x\" 对应的 value 给更新回来了。 当然这是在变量冲突的情况下，会保存真实存在的局部变量的值。但如果不冲突，比如 bar 函数里面是 exec(\"y = 2\")，那么 locals() 里面就会存在两个键值对。但只有 x 才是真正的局部变量，而 y 则不是。 将 exec(\"x = 2\") 换成 locals()[\"x\"] = 2 也是一样的效果，它们都是往局部名字空间中添加一个键值对，但不会创建一个局部变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 变量名冲突的问题","id":"270","title":"变量名冲突的问题"},"271":{"body":"当 Python 中混进一只薛定谔的猫…… ，这是猫哥在 19 年更新的一篇文章，里面探讨的内容我们本文的主题是重叠的。猫哥在文章中举了几个疑惑重重的例子，看看用上面学到的内容能不能合理地解释。 # 例 0\ndef foo(): exec('y = 1 + 1') z = locals()['y'] print(z) foo()\n# 输出：2 # 例 1\ndef foo(): exec('y = 1 + 1') y = locals()['y'] print(y) foo()\n# 报错：KeyError: 'y' 以上是猫哥文章中举的示例，首先例 0 很简单，因为 exec 影响了所在的局部名字空间，里面存在 \"y\": 2 这个键值对。至于里面的变量 z 则不影响，因为我们获取的是 \"y\" 这个 key 对应的 value。 但例 1 则不同，因为 Python 在语法解析的时候发现了 y = ... 这样的赋值语句，那么它在编译的时候就知道函数里面存在 y 这个局部变量，并写入符号表中。既然符号表中存在，那么调用 locals 的时候就会对它进行更新。但是对 y 赋值是发生在调用 locals 之后，所以在调用 locals 的时候，y 的值还是一个 NULL，也就是变量还没有赋值。所以会将名字空间中的 \"y\": 2 这个键值对给删掉，于是报出 KeyError 错误。 再来看看猫哥文章的例 2： # 例 2\ndef foo(): y = 1 + 1 y = locals()['y'] print(y) foo()\n# 输出：2 locals() 是对真实存在的局部变量的一个拷贝，在调用 locals 之前 y 就已经创建好了。符号表里面有 \"y\"，f_localsplus 里面有一个数值 2，所以调用 locals() 的时候，会得到 {\"y\": 2}，因此函数执行正常。 猫哥文章的例 3： # 例3\ndef foo(): exec('y = 1 + 1') boc = locals() y = boc['y'] print(y) foo()\n# KeyError: 'y' 这个例3 和例1 是一样的，只不过用变量 boc 将局部名字空间保存起来了。执行 exec 的时候，会创建局部名字空间，写入键值对 \"y\": 2。但调用 locals 的时候，发现函数内部存在局部变量 y 并且还尚未赋值，于是又会将 \"y\": 2 这个键值对给删掉，因此 boc 变成了一个空字典。 所以在执行 y = boc[\"y\"] 的时候会出现 KeyError。 猫哥文章的例 4： # 例4\ndef foo(): boc = locals() exec('y = 1 + 1') y = boc['y'] print(y) foo()\n# 输出：2 显然在调用 locals 的时候，会返回一个空字典，因为此时的局部变量都还没有赋值。但需要注意的是：boc 已经指向了局部名字空间（字典），而局部名字空间在一个函数里面也是唯一的。所以 exec(\"y = 1 + 1\") 执行之后，会往局部名字空间里面写入一个键值对，而变量 boc 指向的字典也会发生改变，因为是同一个字典，所以程序正常执行。 猫哥文章的例 5： # 例5\ndef foo(): boc = locals() exec('y = 1 + 1') print(locals()) y = boc['y'] print(y) foo()\n# {'boc': {...}} # KeyError: 'y' 首先在执行 boc = locals() 之后，boc 会指向一个空字典，然后 exec 函数执行之后会往字典里面写入一个键值对 \"y\": 2。如果在 exec 执行之后，直接执行 y = boc[\"y\"]，那么代码是没有问题的，但问题是执行之前插入了一个 print(locals())。 我们说过，当调用 locals 的时候，会对名字空间进行更新，然后返回更新之后的名字空间。由于函数内部存在 y = ... 这样的赋值语句，所以符号表中就存在 \"y\" 这个符号，于是会进行更新。但更新的时候，发现 y 还没有被赋值，于是又将字典中的键值对 \"y\": 2 给删掉了。 由于局部名字空间只有一份，所以 boc 指向的字典也会发生改变，换句话说在 print(locals()) 之后，boc 就指向了一个空字典，因此执行 y = boc[\"y\"] 时会出现 KeyError。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 薛定谔的猫","id":"271","title":"薛定谔的猫"},"272":{"body":"以上我们就探讨了 local 名字空间相关的内容，它是一个字典，是对真实存在的局部变量的一个拷贝，每当我们调用 locals，都会拷贝一次（但字典只会存在一份）。 然后函数的局部变量都是静态存储的，编译时就已经确定，无法在运行时动态添加。我们往局部名字空间里面添加键值对，并不等价于创建局部变量。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 小结","id":"272","title":"小结"},"273":{"body":"前面我们考察了虚拟机执行字节码指令的原理，那么本篇文章就来看看这些指令对应的逻辑是怎样的，每个指令都做了哪些事情。当然啦，由于字节码指令有一两百个，我们没办法逐一分析，这里会介绍一些常见的。至于其它的指令，会随着学习的深入，慢慢揭晓。 介绍完常见指令之后，我们会探讨 Python 赋值语句的背后原理，并分析它们的差异。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 楔子","id":"273","title":"楔子"},"274":{"body":"有一部分指令出现的频率极高，非常常用，我们来看一下。 LOAD_CONST：加载一个常量； LOAD_FAST：在局部作用域中加载一个局部变量； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量； LOAD_NAME：在全局作用域中加载一个全局变量或内置变量； STORE_FAST：在局部作用域中定义一个局部变量，来建立和某个对象之间的映射关系； STORE_GLOBAL：在局部作用域中定义一个使用 global 关键字声明的全局变量，来建立和某个对象之间的映射关系； STORE_NAME：在全局作用域中定义一个全局变量，来建议和某个对象之间的映射关系； 我们举例说明： import dis name = \"古明地觉\" def foo(): age = 16 print(age) global name print(name) name = \"古明地恋\" dis.dis(foo)\n\"\"\" 6 0 LOAD_CONST 1 (16) 2 STORE_FAST 0 (age) 7 4 LOAD_GLOBAL 0 (print) 6 LOAD_FAST 0 (age) 8 CALL_FUNCTION 1 10 POP_TOP 9 12 LOAD_GLOBAL 0 (print) 14 LOAD_GLOBAL 1 (name) 16 CALL_FUNCTION 1 18 POP_TOP 10 20 LOAD_CONST 2 ('古明地恋') 22 STORE_GLOBAL 1 (name) 24 LOAD_CONST 0 (None) 26 RETURN_VALUE\n\"\"\" 我们看到 age = 16 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 16； STORE_FAST：在局部作用域中创建一个局部变量，这里是 age； print(age) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_FAST：在局部作用域中加载一个局部变量，这里是 age； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； print(name) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 name； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； name = \"古明地恋\" 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 \"古明地恋\"； STORE_GLOBAL：在局部作用域中创建一个 global 关键字声明的全局变量，这里是 name； 这些指令非常常见，因为它们和常量、变量的加载，以及变量的定义密切相关，你写的任何代码在反编译之后都少不了它们的身影。 注：不管加载的是常量、还是变量，得到的永远是指向对象的指针。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 常用指令","id":"274","title":"常用指令"},"275":{"body":"这里再通过变量赋值感受一下字节码的执行过程，首先关于变量赋值，你平时是怎么做的呢？ 这些赋值语句背后的原理是什么呢？我们通过字节码来逐一回答。 1）a, b = b, a 的背后原理是什么？ 想要知道背后的原理，查看它的字节码是我们最好的选择。 1 0 LOAD_NAME 0 (b) 2 LOAD_NAME 1 (a) 4 ROT_TWO 6 STORE_NAME 1 (a) 8 STORE_NAME 0 (b) 10 LOAD_CONST 0 (None) 12 RETURN_VALUE 里面关键的就是 ROT_TWO 指令，虽然我们还没看这个指令，但也能猜出来它负责交换栈里面的两个元素。假设 a 和 b 的值分别为 22、33，看一下运行时栈的变化过程。 示意图还是很好理解的，关键就在于 ROT_TWO 指令，它是怎么交换元素的呢？ case TARGET(ROT_TWO): { // 获取栈顶元素 PyObject *top = TOP(); // 获取从栈顶开始的第二个元素（栈底元素） PyObject *second = SECOND(); // 将栈顶元素设置为 second，将栈的第二个元素设置为 top // 完成两个元素之间的交换 SET_TOP(second); SET_SECOND(top); FAST_DISPATCH();\n} 执行 ROT_TWO 指令之前，栈里有两个元素，栈顶元素是 a，栈底元素是 b。执行 ROT_TWO 指令之后，栈顶元素是 b，栈底元素是 a。然后后面的两个 STORE_NAME 会将栈里面的元素 b、a 依次弹出，赋值给 a、b，从而完成变量交换。 2）a, b, c = c, b, a 的背后原理是什么？ 老规矩，还是查看字节码，因为一切真相都隐藏在字节码当中。 1 0 LOAD_NAME 0 (c) 2 LOAD_NAME 1 (b) 4 LOAD_NAME 2 (a) 6 ROT_THREE 8 ROT_TWO 10 STORE_NAME 2 (a) 12 STORE_NAME 1 (b) 14 STORE_NAME 0 (c) 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 整个过程和 a, b = b, a 是相似的，首先 LOAD_NAME 将变量 c、b、a 依次压入栈中。由于栈先入后出的特性，此时栈的三个元素按照顺序（从栈顶到栈底）分别是 a、b、c。然后是 ROT_THREE 和 ROT_TWO，毫无疑问，这两个指令执行完之后，会将栈的三个元素调换顺序，也就是将 a、b、c 变成 c、b、a。最后 STORE_NAME 将栈的三个元素 c、b、a 依次弹出，分别赋值给 a、b、c，从而完成变量的交换。 因此核心就在 ROT_THREE 和 ROT_TWO 上面，由于后者上面已经说过了，所以我们看一下 ROT_THREE。 case TARGET(ROT_THREE): { PyObject *top = TOP(); PyObject *second = SECOND(); PyObject *third = THIRD(); SET_TOP(second); SET_SECOND(third); SET_THIRD(top); FAST_DISPATCH();\n} 栈顶元素是 top、栈的第二个元素是 second、栈的第三个元素是 third，然后将栈顶元素设置为 second、栈的第二个元素设置为 third、栈的第三个元素设置为 top。所以栈里面的 a、b、c 在经过 ROT_THREE 之后就变成了 b、c、a，显然这还不是正确的结果。于是继续执行 ROT_TWO，将栈的前两个元素进行交换，执行完之后就变成了 c、b、a。 假设 a、b、c 的值分别为 \"a\"、\"b\"、\"c\"，整个过程如下： 对于多元赋值来说，解释器的做法是固定的，首先按照从左往右的顺序，将等号右边的变量依次压入栈中，然后在栈里面对元素做处理，最后再将栈里的元素弹出，仍旧按照从左往右的顺序，依次赋值给等号左边的变量。 另外这里为了交换栈里的三个元素，使用了两个指令，但其实一个指令就够了，只需将栈顶元素和栈底元素进行交换即可，因为中间的元素是不需要动的。而在之后的版本中，官方优化了这个逻辑。 3）a, b, c, d = d, c, b, a 的背后原理是什么？它和上面提到的 1）和 2）有什么区别呢？ 我们还是看一下字节码。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_TUPLE 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 将等号右边的变量，按照从左往右的顺序，依次压入栈中，但此时没有直接将栈里面的元素做交换，而是构建一个元组。因为往栈里面压入了四个元素，所以 BUILD_TUPLE 后面的 oparg 是 4，表示构建长度为 4 的元组。 case TARGET(BUILD_TUPLE): { // 元素从栈顶到栈底依次是 a、b、c、d PyObject *tup = PyTuple_New(oparg); if (tup == NULL) goto error; // 将元素依次弹出，弹出的顺序也是 a、b、c、d // 但是注意循环，元素是从后往前设置的 // 所以 item[3], item[2], item[1], item[0] = a, b, c, d while (--oparg >= 0) { PyObject *item = POP(); PyTuple_SET_ITEM(tup, oparg, item); } // 将元组 item 压入栈中，元组为 (d, c, b, a) PUSH(tup); DISPATCH();\n} 此时栈里面只有一个元素，指向一个元组。接下来是 UNPACK_SEQUENCE，负责对序列进行解包，它的指令参数也是 4，表示要解包的序列的长度为 4，我们来看看它的逻辑。 case TARGET(UNPACK_SEQUENCE): { PREDICTED(UNPACK_SEQUENCE); // seq：从栈里面弹出的元组 (d, c, b, a) // item：用于遍历元素 // items：指向一个 PyObject * 类型的数组 PyObject *seq = POP(), *item, **items; if (PyTuple_CheckExact(seq) && PyTuple_GET_SIZE(seq) == oparg) { // 获取元组内部的 ob_item 字段，元素就存储在它指向的数组中 items = ((PyTupleObject *)seq)->ob_item; // 遍历内部的每一个元素，并依次压入栈中 // 由于是从后往前遍历的，所以遍历的元素依次是 a b c d // 但在压入栈中之后，元素从栈顶到栈底就变成了 d c b a while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } else if (PyList_CheckExact(seq) && PyList_GET_SIZE(seq) == oparg) { // 该指令同样适用于列表，逻辑一样（一会儿会看到） items = ((PyListObject *)seq)->ob_item; while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } // ... Py_DECREF(seq); DISPATCH();\n} 最后 STORE_NAME 将 d c b a 依次弹出，赋值给变量 a b c d，从而完成变量交换。所以当交换的变量多了之后，不会直接在运行时栈里面操作，而是将栈里面的元素挨个弹出，构建元组；然后再按照指定顺序，将元组里面的元素重新压到栈里面。 假设变量 a b c d 的值分别为 1 2 3 4，我们画图来描述一下整个过程。 不管是哪一种做法，Python 在进行变量交换时所做的事情是不变的，核心分为三步走。首先将等号右边的变量，按照从左往右的顺序，依次压入栈中；然后对运行时栈里面元素的顺序进行调整；最后再将运行时栈里面的元素挨个弹出，还是按照从左往右的顺序，再依次赋值给等号左边的变量。 只不过当变量不多时，调整元素位置会直接基于栈进行操作；而当达到四个时，则需要额外借助于元组。 然后多元赋值也是同理，比如 a, b, c = 1, 2, 3，看一下它的字节码。 1 0 LOAD_CONST 0 ((1, 2, 3)) 2 UNPACK_SEQUENCE 3 4 STORE_NAME 0 (a) 6 STORE_NAME 1 (b) 8 STORE_NAME 2 (c) 10 LOAD_CONST 1 (None) 12 RETURN_VALUE 元组直接作为一个常量被加载进来了，然后解包，再依次赋值。 4）a, b, c, d = d, c, b, a 和 a, b, c, d = [d, c, b, a] 有区别吗？ 答案是没有区别，两者在反编译之后对应的字节码指令只有一处不同。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_LIST 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 前者是 BUILD_TUPLE，现在变成了 BUILD_LIST，其它部分一模一样，并且解包用的依旧是 UNPACK_SEQUENCE 指令，所以两者的效果是相同的。当然啦，由于元组的构建比列表快一些，因此还是推荐第一种写法。 5）a = b = c = 123 背后的原理是什么？ 如果变量 a、b、c 指向的值相同，比如都是 123，那么便可以通过这种方式进行链式赋值。那么它背后是怎么做的呢？ 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 STORE_NAME 2 (c) 12 LOAD_CONST 1 (None) 14 RETURN_VALUE 出现了一个新的字节码指令 DUP_TOP，只要搞清楚它的作用，事情就简单了。 case TARGET(DUP_TOP): { // 获取栈顶元素，注意是获取、不是弹出 // TOP：查看元素，POP：弹出元素 PyObject *top = TOP(); // 增加指向对象的引用计数 Py_INCREF(top); // 压入栈中 PUSH(top); FAST_DISPATCH();\n} 所以 DUP_TOP 干的事情就是将栈顶元素拷贝一份，再重新压到栈里面。另外不管链式赋值语句中有多少个变量，模式都是一样的。 我们以 a = b = c = d = e = 123 为例： 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 DUP_TOP 12 STORE_NAME 2 (c) 14 DUP_TOP 16 STORE_NAME 3 (d) 18 STORE_NAME 4 (e) 20 LOAD_CONST 1 (None) 22 RETURN_VALUE 将常量压入运行时栈，然后拷贝一份，赋值给 a；再拷贝一份，赋值给 b；再拷贝一份，赋值给 c；再拷贝一份，赋值给 d；最后自身赋值给 e。 当然啦，虽然 Python 一切皆对象，但拿到的都是指向对象的指针，所以这里拷贝的是指针。 以上就是链式赋值的秘密，其实没有什么好神奇的，就是将栈顶元素进行拷贝，再依次赋值。但是这背后有一个坑，就是给变量赋的值不能是可变对象，否则容易造成 BUG。 a = b = c = {} a[\"ping\"] = \"pong\"\nprint(a) # {'ping': 'pong'}\nprint(b) # {'ping': 'pong'}\nprint(c) # {'ping': 'pong'} 虽然 Python 一切皆对象，但对象都是通过指针来间接操作的。所以 DUP_TOP 是将字典的地址拷贝一份，而字典只有一个，因此最终 a、b、c 会指向同一个字典。 6）a is b 和 a == b 的区别是什么？ is 用于判断两个变量是不是引用同一个对象，也就是保存的对象的地址是否相等；而 == 则是判断两个变量引用的对象是否相等，等价于 a.__eq__(b) 。 Python 的变量在 C 看来只是一个指针，因此两个变量是否指向同一个对象，等价于 C 中的两个指针存储的地址是否相等； 而 Python 的 ==，则需要调用 PyObject_RichCompare，来比较它们指向的对象所维护的值是否相等。 这两个语句的字节码指令是一样的，唯一的区别就是指令 COMPARE_OP 的参数不同。 // a is b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 8 (is) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE // a == b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 2 (==) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 我们看到指令参数一个是 8、一个是 2，然后是 COMPARE_OP 指令的背后逻辑： case TARGET(COMPARE_OP): { // 弹出栈顶元素，这里是 b PyObject *right = POP(); // 显然 left 就是 a，因为 b 被弹出之后，a 就成为了新的栈顶元素 PyObject *left = TOP(); // 进行比较，比较结果为 res PyObject *res = cmp_outcome(tstate, oparg, left, right); // 减少 left 和 right 引用计数 Py_DECREF(left); Py_DECREF(right); // 将栈顶元素替换为 res SET_TOP(res); if (res == NULL) goto error; // 指令预测，暂时不用管，等介绍 if 控制流的时候再说 PREDICT(POP_JUMP_IF_FALSE); PREDICT(POP_JUMP_IF_TRUE); DISPATCH();\n} 所以逻辑很简单，核心就在 cmp_outcome 函数中。 // Python/ceval.c\nstatic PyObject *\ncmp_outcome(PyThreadState *tstate, int op, PyObject *v, PyObject *w)\n{ int res = 0; // op 就是 COMPARE_OP 指令的参数 switch (op) { // PyCmp_IS 是一个枚举变量，等于 8，定义在 Include/opcode.h 中 // 而 is 关键字，在 C 的层面就是一个 == 判断 case PyCmp_IS: res = (v == w); break; // is not 则对应 != case PyCmp_IS_NOT: res = (v != w); break; // in 关键字 case PyCmp_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; break; // not in 关键字 case PyCmp_NOT_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; res = !res; break; // except 关键字 case PyCmp_EXC_MATCH: if (PyTuple_Check(w)) { Py_ssize_t i, length; length = PyTuple_Size(w); for (i = 0; i < length; i += 1) { PyObject *exc = PyTuple_GET_ITEM(w, i); if (!PyExceptionClass_Check(exc)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } } else { if (!PyExceptionClass_Check(w)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } res = PyErr_GivenExceptionMatches(v, w); break; default: // 剩下的走 PyObject_RichCompare 逻辑 // 这是一个函数调用，比较对象维护的值是否相等 return PyObject_RichCompare(v, w, op); } v = res ? Py_True : Py_False; Py_INCREF(v); return v;\n} 我们实际举个栗子： a = 3.14\nb = float(\"3.14\")\nprint(a is b) # False\nprint(a == b) # True a 和 b 都是 3.14，两者是相等的，但不是同一个对象。 反过来也是如此，如果 a is b 成立，那么 a == b 也不一定成立。可能有人好奇，a is b 成立说明 a 和 b 指向的是同一个对象，那么 a == b 表示该对象和自己进行比较，结果应该始终是相等的呀，为啥也不一定成立呢？以下面两种情况为例： class Girl: def __eq__(self, other): return False g = Girl()\nprint(g is g) # True\nprint(g == g) # False __eq__ 返回 False，此时虽然是同一个对象，但是两者不相等。 import math\nimport numpy as np a = float(\"nan\")\nb = math.nan\nc = np.nan\nprint(a is a, a == a) # True False\nprint(b is b, b == b) # True False\nprint(c is c, c == c) # True False nan 是一个特殊的浮点数，意思是 not a number（不是一个数字），用于表示空值。而 nan 和所有数字的比较结果均为 False，即使是和它自身比较。 但需要注意的是，在使用 == 进行比较的时候虽然是不相等的，但如果放到容器里面就不一定了。举个例子： import numpy as np lst = [np.nan, np.nan, np.nan]\nprint(lst[0] == np.nan) # False\nprint(lst[1] == np.nan) # False\nprint(lst[2] == np.nan) # False\n# lst 里面的三个元素和 np.nan 均不相等 # 但是 np.nan 位于列表中，并且数量是 3\nprint(np.nan in lst) # True\nprint(lst.count(np.nan)) # 3 出现以上结果的原因就在于，元素被放到了容器里，而容器的一些 API 在比较元素时会先判定它们存储的对象的地址是否相同，即：是否指向了同一个对象。如果是，直接认为相等；否则，再去比较对象维护的值是否相等。可以理解为先进行 is 判断，如果结果为 True，直接判定两者相等；如果 is 操作的结果不为 True，再去进行 == 判断。 因此 np.nan in lst 的结果为 True，lst.count(np.nan) 的结果是 3，因为它们会先比较对象的地址。地址相同，则直接认为对象相等。 在用 pandas 做数据处理的时候，nan 是一个非常容易坑的地方。 提到 is 和 ==，那么问题来了，在和 True、False、None 比较时，是用 is 还是用 == 呢？由于 True、False、None 它们不仅是关键字，而且也被看做是一个常量，最重要的是它们都是单例的，所以我们应该用 is 判断。 另外 is 在底层只需要一个 == 即可完成，但 Python 的 ==，在底层则需要调用 PyObject_RichCompare 函数。因此 is 在速度上也更有优势，== 操作肯定比函数调用要快。 补充：判断对象是否相等，底层有两个常用的函数，分别是 PyObject_RichCompare 和 PyObject_RichCompareBool。 PyObject_RichCompare 是直接比较对象的值是否相等。而 PyObject_RichCompareBool 会先比较地址是否相等（即是否是同一个对象），如果是同一个对象，那么直接认为相等，否则再调用 PyObject_RichCompare 判断值是否相等。 对于容器的一些 API，在比较对象是否相等时，调用的都是 PyObject_RichCompareBool。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 变量赋值的具体细节","id":"275","title":"变量赋值的具体细节"},"276":{"body":"以上我们就分析了常见的几个指令，以及变量赋值的底层逻辑，怎么样，是不是对 Python 有更深的理解了呢。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 小结","id":"276","title":"小结"},"277":{"body":"前面我们分析了虚拟机执行字节码的原理，并且也介绍了不少指令，但这些指令都是从上往下顺序执行的，不涉及任何的跳转。而像流程控制语句，比如 if、for、while、try 等等，它们在执行时会发生跳转，因此 Python 底层一定还存在相应的跳转指令。 那么从现在开始，就来分析一下这些流程控制语句的实现原理，本文先来介绍 if 语句。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 楔子","id":"277","title":"楔子"},"278":{"body":"if 语句应该是最简单也是最常用的流程控制语句，那么它的字节码是怎么样的呢？当然这里的 if 语句指的是 if elif else 整体，里面的某个条件叫做该 if 语句的分支。 我们看一下 if 语句的字节码长什么样子。 import dis code_string = \"\"\"\nscore = 90 if score >= 85: print(\"Good\") elif score >= 60: print(\"Normal\") else: print(\"Bad\")\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译得到的字节码指令比较多，我们来慢慢分析。另外为了阅读方便，源代码行号就不显示了。 // 加载常量 90 并压入运行时栈 0 LOAD_CONST 0 (90) // 加载符号表中索引为 0 的符号 \"score\"，弹出运行时栈的栈顶元素 90 // 然后将两者绑定起来，存放在当前的名字空间中 2 STORE_NAME 0 (score) // 加载变量 score 4 LOAD_NAME 0 (score) // 加载常量 85 6 LOAD_CONST 1 (85) // 进行比较，操作符是 >=，这个指令之前介绍过的 8 COMPARE_OP 5 (>=) // 如果比较结果为 False，就进行跳转，从名字也能看出指令的含义 // 那么跳转到什么地方呢？指令参数 22 表示跳转到偏移量为 22 的指令 // 很明显，就是当前分支的下一个分支。关于具体是怎么跳转的，一会儿说 10 POP_JUMP_IF_FALSE 22 // 如果走到这里说明没有跳转，当前分支的条件为真，那么开始执行该分支内部的逻辑 // 以下 4 条指令对应 print(\"Good\") 12 LOAD_NAME 1 (print) 14 LOAD_CONST 2 ('Good') 16 CALL_FUNCTION 1 18 POP_TOP // if 语句只有一个分支会被执行，如果执行了某个分支，那么整个 if 语句就结束了 // 于是向前跳转 26 个偏移量，来到偏移量为 48 的指令 20 JUMP_FORWARD 26 (to 48) // 对应 score >= 60\n>> 22 LOAD_NAME 0 (score) 24 LOAD_CONST 3 (60) 26 COMPARE_OP 5 (>=) // 如果比较结果为假，跳转到偏移量为 40 的指令 28 POP_JUMP_IF_FALSE 40 // 以下 4 条指令对应 print(\"Normal\") 30 LOAD_NAME 1 (print) 32 LOAD_CONST 4 ('Normal') 34 CALL_FUNCTION 1 36 POP_TOP // 向前跳转 8 个偏移量，来到偏移量为 48 的指令 38 JUMP_FORWARD 8 (to 48) // 最后一个是 else 分支，而 else 分支没有判断条件\n>> 40 LOAD_NAME 1 (print) 42 LOAD_CONST 5 ('Bad') 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明 if 语句结束了，而下面也没有代码了，于是返回 // 每个代码块对应的指令的最后都有一个 return\n>> 48 LOAD_CONST 6 (None) 50 RETURN_VALUE 我们看到字节码偏移量之前有几个 >> 这样的符号，显然这是 if 语句中的每一个分支开始的地方。 经过分析，整个 if 语句的字节码指令还是很简单的。就是从上到下依次判断每一个分支，如果某个分支条件成立，就执行该分支的代码，执行完毕后结束整个 if 语句；否则跳转到下一个分支。 显然核心就在于 POP_JUMP_IF_FALSE 指令，我们看一下它的逻辑。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » if 字节码","id":"278","title":"if 字节码"},"279":{"body":"COMPARE_OP 执行完之后会将比较的结果压入运行时栈，而 POP_JUMP_IF_FALSE 指令则是将结果从栈顶弹出并判断真假。如果为假，那么跳到下一个分支，否则执行此分支的代码。 case TARGET(POP_JUMP_IF_FALSE): { PREDICTED(POP_JUMP_IF_FALSE); // 从栈顶弹出比较结果 PyObject *cond = POP(); int err; // 如果 cond is True，说明当前分支的条件成立，那么执行下一条指令 if (cond == Py_True) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is False，那么通过 JUMPTO 跳转到 if 语句的下一个分支 // 关于 JUMPTO 一会儿介绍 if (cond == Py_False) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 到这里说明 cond 不是布尔值，那么调用 PyObject_IsTrue 并判断结果是否为真 // PyObject_IsTrue(cond)：等价于 Python 的 bool(cond) is True err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 cond 的布尔值为真，那么返回 1，此时什么也不做 // 最后会调用 DISPATCH()，去执行下一条指令 if (err > 0) ; // 如果 cond 的布尔值为假，那么返回 0，跳转到下一个 if 分支 else if (err == 0) JUMPTO(oparg); else goto error; DISPATCH();\n} 逻辑不难理解，但是里面出现了判断对象布尔值的函数，我们补充一下。 // Objects/object.c // 等价于 Python 的 bool(v) is True\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身就是布尔值 True，返回 1 if (v == Py_True) return 1; // 如果 v 本身就是布尔值 False，返回 0 if (v == Py_False) return 0; // 如果 v 是 None，返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且实现了 nb_bool（对应 __bool__） // 那么调用，如果结果不为 0，返回 1，否则返回 0 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且实现了 mp_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且实现了 sq_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 如果以上条件都不满足，直接返回 1，比如自定义类的实例对象（默认为真） else return 1; // 如果 res > 0 返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} // not 底层也调用了 PyObject_IsTrue\nint\nPyObject_Not(PyObject *v)\n{ int res; // 如果 v 是真，res == 1，那么 res == 0 结果是 0 // 如果 v 是假，res == 0，那么 res == 0 结果是 1 // 相当于取反 res = PyObject_IsTrue(v); if (res < 0) return res; return res == 0;\n} // Objects/boolobject.c\nstatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // <class 'bool'> 是一个 Python 类，这里的 bool_new 便是它的构造函数 PyObject *x = Py_False; long ok; // 不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 只接收 0 ~ 1 个参数，如果不传，那么默认返回 False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 PyObject_IsTrue，所以我们说 if v 和 if bool(v) 是等价的 // 因为当 v 不是布尔值时，if v 对应的指令内部会调用 PyObject_IsTrue // 而 bool(v) 也会调用 PyObject_IsTrue，所以两者是等价的 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 调用 PyBool_FromLong 创建布尔值，ok 为 1 返回 True，为 0 返回 False return PyBool_FromLong(ok);\n} PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 相信你现在明白了为什么 if 后面不跟布尔值也是可以的，因为有一个 C 函数 PyObject_IsTrue，可以判断任意对象的真假。如果 if 后面跟着的不是布尔值，那么会自动调用该函数。另外由于 bool(v) 也会调用该函数，所以 if v 和 if bool(v) 是等价的。 注：没有 PyObject_IsFalse。 说完了 POP_JUMP_IF_FALSE 指令，再补充一个和它相似的指令叫 POP_JUMP_IF_TRUE，它表示当比较结果为真时，跳到下一个分支，否则执行当前分支的代码。可能有人觉得，这不对吧，比较结果为真，难道不应该执行当前分支的逻辑吗？所以 POP_JUMP_IF_TRUE 指令似乎本身就是矛盾的。 仔细想想你应该能够猜到原因，答案就是使用了 not。 import dis code_string = \"\"\"\nif 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" code_string = \"\"\"\nif not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 正常情况下如果比较结果为 False，则跳转到 if 语句的下一个分支，所以 POP_JUMP_IF_FALSE 指令是合理的。至于 POP_JUMP_IF_TRUE 指令从逻辑上似乎就不该存在，因为它和 if 语句本身是相矛盾的。但现在我们明白了，该指令其实是为 not 关键字准备的。如果比较结果为真，那么 not 取反就是假，于是跳转到 if 语句的下一个分支，所以整个逻辑依旧是正确的。 当然这里只有一个 not，即使有很多个 not 也是可以的，尽管这没太大意义。 import dis # 这里有 4 个 not，因为是偶数个，两两相互抵消\n# 所以结果等价于 if 2 > 1\ncode_string = \"\"\"\nif not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" # 这里有 5 个 not，因为是奇数个，两两相互抵消之后还剩下一个\n# 所以结果等价于 if not 2 > 1\ncode_string = \"\"\"\nif not not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 然后再看一下 POP_JUMP_IF_TRUE 指令的内部逻辑，显然它和 POP_JUMP_IF_FALSE 是类似的。 case TARGET(POP_JUMP_IF_TRUE): { PREDICTED(POP_JUMP_IF_TRUE); // 弹出栈顶元素 PyObject *cond = POP(); int err; // 如果 cond is False，那么 not 之后就是 True // 所以当前 if 分支成立，于是执行下一条指令 if (cond == Py_False) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is True，那么 not 之后就是 False // 因此跳转到下一个分支 if (cond == Py_True) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 说明 cond 不是布尔值，那么通过 PyObject_IsTrue 判断是否为真 // 为真返回 1，为假返回 0，出现错误的话返回 -1（基本不会发生） err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 err > 0，说明布尔值为真，但还要进行 not 取反，因此最终整体为假 // 所以会跳转到下一个分支 if (err > 0) { JUMPTO(oparg); } // 如果 err == 0，说明布尔值为假，那么 not 取反之后整体为真 // 因此会执行当前分支内的逻辑，所以此处什么也不用做，直接 DISPATCH() 到下一条指令即可 else if (err == 0) ; else goto error; DISPATCH();\n} 以上就是 POP_JUMP_IF_FALSE 和 POP_JUMP_IF_TRUE 的内部逻辑，可以说非常简单。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » POP_JUMP_IF_FALSE","id":"279","title":"POP_JUMP_IF_FALSE"},"28":{"body":"然后来说一说 Python 的 C API，这个非常关键。首先 Python 解释器听起来很高大上，但按照陈儒老师的说法，它不过就是用 C 语言写出的一个开源软件，从形式上和其它软件并没有本质上的不同。 比如你在 Windows 系统中打开 Python 的安装目录，会发现里面有一个二进制文件 python.exe 和一个动态库文件 python38.dll。二进制文件负责执行，动态库文件则包含了相应的依赖，当然编译的时候也可以把动态库里的内容统一打包到二进制文件中，不过大部分软件在开发时都会选择前者。 既然解释器是用 C 写的，那么在执行时肯定会将 Python 代码翻译成 C 代码，这是毫无疑问的。比如创建一个列表，底层就会创建一个 PyListObject 实例，比如调用某个内置函数，底层会调用对应的 C 函数。 所以如果你想搞懂 Python 代码的执行逻辑或者编写 Python 扩展，那么就必须要清楚解释器提供的 API 函数。而按照通用性来划分的话，这些 API 可以分为两种。 泛型 API； 特定类型 API； 泛型 API 顾名思义，泛型 API 和参数类型无关，属于抽象对象层。这类 API 的第一个参数是 PyObject *，可以处理任意类型的对象，API 内部会根据对象的类型进行区别处理。 而且泛型 API 的名称也是有规律的，格式为 PyObject_###，我们举例说明。 所以泛型 API 一般以 PyObject_ 开头，第一个参数是 PyObject *，表示可以处理任意类型的对象。 特定类型 API 顾名思义，特定类型 API 和对象的类型是相关的，属于具体对象层，只能作用在指定类型的对象上面。因此不难发现，每种类型的对象，都有属于自己的一组特定类型 API。 // 通过 C 的 double 创建 PyFloatObject\nPyObject* PyFloat_FromDouble(double v); // 通过 C 的 long 创建 PyLongObject\nPyObject* PyLong_FromLong(long v);\n// 通过 C 的 char * 创建 PyLongObject\nPyObject* PyLong_FromString(const char *str, char **pend, int base) 以上就是解释器提供的两种 C API，了解完之后我们再来看看对象是如何创建的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 的 C API","id":"28","title":"Python 的 C API"},"280":{"body":"指令跳转是由 JUMPTO 实现的，它内部的逻辑长啥样呢？并且跳转除了 JUMPTO 之外，还有一个 JUMPBY，这两者有啥区别呢？ // Python/ceval.c #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 字节码指令的遍历是通过 next_instr 实现的，如果将指令执行的方向代表前进的方向。 JUMPTO(x)：表示从头开始向前跳转 x 个偏移量。 JUMPBY(x)：表示从当前指令所在的位置向前跳转 x 个偏移量。 所以 JUMPTO 表示绝对跳转，JUMPBY 表示相对跳转。不难发现，JUMPTO 既可以向前跳转（偏移量增大），也可以向后跳转（偏移量减小）；而 JUMPBY 只能向前跳转。 假设参数为 n，当前指令的偏移量为 m。对于 JUMPTO 而言，跳转之后的偏移量始终为 2n，如果 m < 2n 就是向前跳转，m > 2n 就是向后跳转。但对于 JUMPBY 而言，由于它是从当前待执行的指令开始跳转的，所以只能向前跳转（偏移量增大）。 另外在看字节码指令的时候，我们还看到了一个 JUMP_FORWARD 指令，当某个分支执行完毕之后，会直接跳转到 if 语句结束的下一条指令。并且不同分支对应的 JUMP_FORWARD 指令的参数是不同的，所以它内部一定使用了相对跳转。 case TARGET(JUMP_FORWARD): { JUMPBY(oparg); FAST_DISPATCH();\n} 我们分析的没错，它内部就是调用了一个 JUMPBY，因为终点相同、但跳转的偏移量不同，所以只能是相对跳转。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » JUMPTO","id":"280","title":"JUMPTO"},"281":{"body":"通过引入计算跳转，可以避免不必要的匹配。因为整个指令集合是已知的，这就说明某条指令在执行时，便可知道它的下一条指令是什么。所以当前指令处理完后，可以直接跳转到下一条指令对应的处理逻辑中，这就是计算跳转。但如果不使用计算跳转，那么每次读取到指令后，都要进入 switch，顺序匹配一百多个 case 分支，找到匹配成功的那一个。 因此使用计算跳转可以避免不必要的匹配，既然提前知道下一条指令是啥了，那么直接精确跳转就行，无需多走一遍 switch。不过要想实现计算跳转，需要 GCC 支持标签作为值，即 goto *label_addr 用法，由于 label_addr 是一个标签地址，那么解引用之后就是标签了。至于具体会跳转到哪一个标签，取决于 label_addr 保存了哪一个标签的地址，因此这种跳转是动态的，在运行时决定跳转目标。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 虚拟机为每个指令的处理逻辑都定义了一个标签，对于计算跳转来说，goto 的结果是 *标签地址，这个地址是运行时计算得出的。我们举个例子，随便看一段字节码指令集。 比如当前正在执行 LOAD_FAST 指令，那么下一条指令可以是 STORE_FAST、LOAD_FAST 以及 BUILD_LIST 等。当开启计算跳转时： 如果下一条指令是 STORE_FAST，那么之后就会跳转到 STORE_FAST 对应的标签； 如果下一条指令是 LOAD_FAST，那么之后就会跳转到 LOAD_FAST 对应的标签； 如果下一条指令是 BUILD_LIST，那么之后就会跳转到 BUILD_LIST 对应的标签； 所以在运行时判断指令的值，获取对应的标签，从而实现精确跳转，这就是计算跳转。当然这些内容在剖析虚拟机执行字节码时已经说过了，这里再回顾一下。 接下来说一说指令预测，不难发现，如果是计算跳转，那么指令预测功能貌似没啥用，因为总是能精确跳转到下一条指令对应的标签中。没错，指令预测只有在不使用计算跳转的情况下有用，那什么是指令预测呢？ 在不使用计算跳转时，goto 后面必须是一个静态的标签，跳转位置在编译阶段便已经固定，换句话说一个指令执行完毕后要跳转到哪一个标签是写死的，不能保证跳转后的标签正好对应下一条指令的处理逻辑。比如 LOAD_FAST 的下一条指令可以是 STORE_FAST 和 BUILD_LIST，那么应该跳转到哪一个指令对应的标签中呢？ 正因为这种不确定性，绝大部分指令在执行完毕后都会直接跳转到 fast_next_opcode 标签，然后顺序匹配 case 分支。 但也有那么几个指令，由于彼此的关联性很强，很多时候都是成对出现的，面对这样的指令，虚拟机会进行预测。比如 A 和 B 两个指令的关联性很强，尽管 A 的下一条指令除了是 B 之外，也有可能是其它指令，但 B 出现的概率是最大的，因此虚拟机会预测下一条指令是 B 指令。于是在执行完 A 指令之后，会验证自己的预测是否正确，即检测下一条指令是否是 B 指令。如果预测对了，可以实现精确跳转，如果预测错了，就只能回到 switch 语句逐一匹配 case 分支了。 总结一下：指令在执行时，它的下一条指令是已知的，但是不固定，有多种可能。如果不使用计算跳转，由于 goto 后面必须是一个写死的标签，而下一条指令却不固定，那么只能选择进入 switch、顺序匹配 case 分支。但也有那么几对指令，关联性很强，虽然不能保证百分百，但值得做一次尝试，这便是指令预测。 当然啦，如果使用计算跳转，情况则不一样了，此时压根用不到指令预测。因为 goto 后面是 *标签地址，而地址是可以动态获取的。由于所有标签的地址都保存在了一个数组中，不管接下来要处理哪一条指令，都可以获取到对应的标签地址，实现精确跳转。 好，关于指令预测我们已经知道是啥了，那么在源码层面又是如何体现的呢？在 POP_JUMP_IF_FALSE 指令中，我们看到有这么一行逻辑。 里面有一个宏 PREDICTED。 // Python/ceval.c\n#define PREDICTED(op) PRED_##op: 这个宏展开之后又是一个标签，由于调用时结尾加了分号，所以这还是一个空标签。整体效果如下： 那么展开成一个标签有什么用呢？首先肯定是为了跳转，至于具体过程我们再看一下 COMPARE_OP 指令就明白了。 COMPARE_OP 指令上面已经介绍了，它会对两个对象进行比较，并将比较结果压入运行时栈。之后它做了指令预测，并且还预测了两次，因为虚拟机认为 COMPARE_OP 执行完之后大概率会执行 POP_JUMP_IF_FALSE 或 POP_JUMP_IF_TRUE，所以做了一个预测。而相关逻辑位于 PREDICT 中，看一下它长什么样子。 // Python/ceval.c // 如果开启计算跳转，那么指令预测不生效，因为本身就知道该跳转到哪个指令对应的标签\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n// 如果不开启计算跳转，那么会比较预测的指令和实际的指令是否相等\n// 所以 COMPARE_OP 指令处理逻辑里面的 PREDICT(POP_JUMP_IF_FALSE)\n// 就是在判断下一条指令是不是自己预测的 POP_JUMP_IF_FALSE\n// 如果是，说明预测成功，那么 goto PRED_POP_JUMP_IF_FALSE\n// 否则说明预测失败，那么会执行 DISPATCH()，然后 goto 到 switch 语句所在位置\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif 以上便是指令预测，说白了就是如果指令 A 和指令 B 具有极高的关联性（甚至百分百），那么执行完 A 指令后会判断下一条指令是不是 B。如果是，那么直接跳转即可，就省去了匹配 case 分支的时间，如果不是，那就只能挨个匹配了。 因为是静态跳转，goto 后面的标签是写死的，编译阶段就确定了，所以只有那种关联度极高的指令才会开启预测功能，因为预测成功的概率比较高。但如果指令 A 的下一条指令有多种可能（假设有 6 种），并且每种指令出现的概率还差不多，那么这时不管预测哪一个，成功的概率都只有 1/6。显然这就不叫预测了，这是在掷骰子，因此对于这样的指令，虚拟机不会为它开启预测功能。 比如 LOAD_FAST 的下一个指令可以是 STORE_FAST、LOAD_FAST、BUILD_LIST 等等，不管预测哪一种，成功的概率都不是特别高，因此它没有进行指令预测。 所以就一句话：只有 A 和 B 两个指令的关联度极高的时候，执行 A 之后才会预测下一条指令是否是 B。预测成功直接跳转，预测失败执行 DISPATCH()，跳转到 fast_next_opcode 标签，进入 switch 语句。 但如果使用了计算跳转，情况就不一样了，此时不会开启指令预测，或者说指令预测里的逻辑会变得无效。 很明显，使用计算跳转后，PREDICT(op) 不会产生任何效果，因此也可以理解为没有开启指令预测。而之所以不用预测，是因为执行 DISPATCH() 的时候，本身就可以精确跳转到指定位置。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 指令预测","id":"281","title":"指令预测"},"282":{"body":"本篇文章我们就分析了 if 语句的实现原理，总的来说不难理解。依旧是在栈桢中执行字节码，只是多了一个指令跳转罢了，至于怎么跳转、跳转到什么地方，全部都体现在字节码中。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 小结","id":"282","title":"小结"},"283":{"body":"在介绍 if 语句的时候，我们看到了最基本的控制流，其核心就是跳转。但是 if 只能向前跳转，而接下来介绍的 for、while 循环，指令是可以回退的，也就是向后跳转。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 楔子","id":"283","title":"楔子"},"284":{"body":"我们看一个简单的 for 循环的字节码。 import dis code_string = \"\"\"\nlst = [1, 2]\nfor item in lst: print(item)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译之后，字节码指令如下。 // 加载常量 1，压入运行时栈 0 LOAD_CONST 0 (1) // 加载常量 2，压入运行时栈 2 LOAD_CONST 1 (2) // 将运行时栈的元素弹出，构建长度为 2 的列表，并压入栈中 4 BUILD_LIST 2 // 将上一步构建的列表从栈顶弹出，并用符号 lst 与之绑定 // 到此 lst = [1, 2] 便完成了 6 STORE_NAME 0 (lst) // 从全局名字空间中加载 lst 8 LOAD_NAME 0 (lst) // 获取对应的迭代器，即 iter(lst) 10 GET_ITER // 开始 for 循环，将里面的元素依次迭代出来 // 如果迭代结束，向前跳转 12 个偏移量，来到偏移量为 26 的指令\n>> 12 FOR_ITER 12 (to 26) // 到这里说明上一步迭代出元素了 // 用符号 item 和迭代出的元素进行绑定 14 STORE_NAME 1 (item) // 对应 print(item) 16 LOAD_NAME 2 (print) 18 LOAD_NAME 1 (item) 20 CALL_FUNCTION 1 22 POP_TOP // 到此，一次遍历就完成了，那么跳转到偏移量为 12 的指令，进行下一轮循环 // 注意：上面的 FOR_ITER 指令和这里的 JUMP_ABSOLUTE 指令的参数都是 12 // 但它们有着不同，FOR_ITER 指令的参数 12 表示从当前位置向前跳转 12 个偏移量 // 而 JUMP_ABSOLUTE 指令的参数 12 表示跳转到偏移量为 12 个位置（或者说从开头跳转 12 个偏移量） 24 JUMP_ABSOLUTE 12\n>> 26 LOAD_CONST 2 (None) 28 RETURN_VALUE 我们直接从 10 GET_ITER 开始看起，首先 for 循环遍历的对象必须是可迭代对象，然后会调用它的 __iter__ 方法，得到迭代器。再不断地调用迭代器的 __next__ 方法，一步一步将里面的值全部迭代出来，当出现 StopIteration 异常时，for 循环捕捉，最后退出。 另外，我们说 Python 里面是先有值，后有变量，for 循环也不例外。循环的时候，先将迭代器中的元素迭代出来，然后再让变量 item 指向。因此包含 10 个元素的迭代器，需要迭代 11 次才能结束。因为 for 循环事先是不知道迭代 10 次就能结束的，它需要再迭代一次，发现没有元素可以迭代、并捕获抛出的 StopIteration 之后，才能结束。 for 循环遍历可迭代对象时，会先拿到对应的迭代器，那如果遍历的就是一个迭代器呢？答案是依旧调用 __iter__，只不过由于本身就是一个迭代器，所以返回的还是其本身。 将元素迭代出来之后，就开始执行 for 循环体的逻辑了。 执行完一轮循环之后，通过 JUMP_ABSOLUTE 跳转到字节码偏移量为 12、也就是 FOR_ITER 的位置开始下一次循环。这里我们发现它没有跳到 GET_ITER 那里，所以可以得出结论，for 循环在遍历的时候只会创建一次迭代器。 下面来看指令对应的具体逻辑： case TARGET(GET_ITER): { // 获取栈顶元素，即上一步压入的列表指针 PyObject *iterable = TOP(); // 调用 PyObject_GetIter，获取对应的迭代器 // 这个函数在介绍迭代器的时候已经说过了 // 等价于 iter = type(iterable).__iter__(iterable) PyObject *iter = PyObject_GetIter(iterable); Py_DECREF(iterable); // 将迭代器 iter 设置为栈顶元素 SET_TOP(iter); if (iter == NULL) goto error; // 指令预测，解释器认为下一条指令大概率是 FOR_ITER 或 CALL_FUNCTION PREDICT(FOR_ITER); PREDICT(CALL_FUNCTION); DISPATCH();\n} 当创建完迭代器之后，就正式进入 for 循环了。所以从 FOR_ITER 开始，进入了虚拟机层面上的 for 循环。 源代码中的 for 循环，在虚拟机层面也一定对应着一个相应的循环控制结构。因为无论进行怎样的变换，都不可能在虚拟机层面利用顺序结构来实现源码层面上的循环结构，这也可以看作是程序的拓扑不变性。 因此源代码是宏观的，虚拟机执行字节码是微观的，尽管两者的层级不同，但本质上等价的，是程序从一种形式到另一种形式的等价转换。 我们来看一下 FOR_ITER 指令对应的具体实现： case TARGET(FOR_ITER): { PREDICTED(FOR_ITER); // 从栈顶获取迭代器对象（指针） PyObject *iter = TOP(); // 调用迭代器类型对象的 tp_iternext，将迭代器内的元素迭代出来 PyObject *next = (*iter->ob_type->tp_iternext)(iter); // 如果 next != NULL，说明迭代到元素了，那么压入运行时栈 if (next != NULL) { PUSH(next); PREDICT(STORE_FAST); PREDICT(UNPACK_SEQUENCE); DISPATCH(); } // 否则说明迭代出现异常 if (_PyErr_Occurred(tstate)) { // 如果异常还不是 StopIteration，那么跳转到 error 标签 if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) { goto error; } else if (tstate->c_tracefunc != NULL) { call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); } // 否则说明是 StopIteration，那么证明迭代完毕，将异常清空 _PyErr_Clear(tstate); } // 迭代结束了，但运行时栈里面还有一个迭代器对象 // 那么要将它弹出，因此这里执行了 STACK_SHRINK(1) STACK_SHRINK(1); Py_DECREF(iter); // 跳转到 for 循环结束后的下一条指令 // 当前的指令为：12 FOR_ITER 12 (to 26) // 所以会通过 JUMPBY 实现一个相对跳转 // 从当前位置向前跳转 12 个偏移量，来到偏移量为 26 的指令 JUMPBY(oparg); PREDICT(POP_BLOCK); DISPATCH();\n} 在执行 FOR_ITER 的时候，如果迭代器没有耗尽，那么会迭代出元素，压入运行时栈，然后调用 DISPATCH() 去执行下一条指令。当一轮循环结束后，还要进行指令回退，从字节码中也看到了，for 循环遍历一次之后，会再次跳转到 FOR_ITER，而跳转所使用的指令就是 JUMP_ABSOLUTE，从名字也能看出这个指令会使用绝对跳转。 case TARGET(JUMP_ABSOLUTE): { PREDICTED(JUMP_ABSOLUTE); // 跳转到偏移量为 oparg 的指令 JUMPTO(oparg);\n#if FAST_LOOPS FAST_DISPATCH();\n#else DISPATCH();\n#endif\n} 之前介绍过 JUMPTO 和 JUMPBY 两个宏， #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个宏都表示跳转 x 个偏移量，但 JUMPTO 是从头开始跳转，所以只要 x 固定，那么跳转位置就始终是固定的。而 JUMPBY 表示从当前位置开始跳转，所以位置不同，跳转的结果也不同。 然后天下没有不散的宴席，随着迭代的进行，for 循环总有退出的那一刻，而这个退出的动作只能落在 FOR_ITER 的身上。在 FOR_ITER 指令执行的过程中，如果遇到了 StopIteration，就意味着迭代结束了。这个结果将导致虚拟机会将迭代器从运行时栈中弹出，同时执行一个 JUMPBY 动作，向前跳跃，在字节码的层面是向下，也就是偏移量增大的方向。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » for 控制流","id":"284","title":"for 控制流"},"285":{"body":"看完了 for，再来看看 while，并且我们还要分析两个关键字：break、continue。 import dis code_string = \"\"\"\na = 0\nwhile a < 10: a += 1 if a == 5: continue if a == 7: break print(a)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 看一下它的指令： // a = 0 0 LOAD_CONST 0 (0) 2 STORE_NAME 0 (a) // 比较 a < 10\n>> 4 LOAD_NAME 0 (a) 6 LOAD_CONST 1 (10) 8 COMPARE_OP 0 (<) // 如果 a < 10 为假，说明循环结束 // 跳转到偏移量为 50 的指令，内部会使用绝对跳转 10 POP_JUMP_IF_FALSE 50 // 到这里说明 while 条件成立，进入循环体 // 执行 a += 1 12 LOAD_NAME 0 (a) 14 LOAD_CONST 2 (1) 16 INPLACE_ADD 18 STORE_NAME 0 (a) // 比较 a == 5 20 LOAD_NAME 0 (a) 22 LOAD_CONST 3 (5) 24 COMPARE_OP 2 (==) // 如果 a == 5 为假，跳转到偏移量为 30 的指令 26 POP_JUMP_IF_FALSE 30 // 否则说明 a == 5 为真，执行 continue // 由于 continue 是立即进入下一轮循环 // 所以直接跳转到偏移量为 4 的指令，即 while 循环的开始位置 // 所以在虚拟机的层面，continue 就是一个跳转指令 28 JUMP_ABSOLUTE 4 // 比较 a == 7\n>> 30 LOAD_NAME 0 (a) 32 LOAD_CONST 4 (7) 34 COMPARE_OP 2 (==) // 如果 a == 7 为假，跳转到偏移量为 40 的指令 36 POP_JUMP_IF_FALSE 40 // 否则说明 a == 7 为真，执行 break // 因此直接跳转到偏移量为 50 的位置，即 while 循环结束后的下一条指令 38 JUMP_ABSOLUTE 50 // print(a)\n>> 40 LOAD_NAME 1 (print) 42 LOAD_NAME 0 (a) 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明一轮循环结束了，那么跳转到偏移量为 4 的位置，即 while 循环的开始位置 48 JUMP_ABSOLUTE 4 // 隐式的 return None\n>> 50 LOAD_CONST 5 (None) 52 RETURN_VALUE 有了 for 循环，再看 while 循环就简单多了，整体逻辑和 for 高度相似，当然里面还结合了 if。 刚才说了，尽管源代码和字节码的层级不同，但本质上是等价的，是程序从一种形式到另一种形式的等价转换。在源码中能看到的，在字节码当中也能看到。比如源代码中的 continue 会跳转到循环所在位置，那么在字节码中自然也会对应一个跳转指令。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » while 控制流","id":"285","title":"while 控制流"},"286":{"body":"以上我们就探讨了 Python 的两种循环，总的来说没什么难度，本质上还是跳转。只不过有时会通过 JUMPTO 进行绝对跳转，有时会通过 JUMPBY 进行相对跳转。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 小结","id":"286","title":"小结"},"287":{"body":"程序在运行的过程中，总是会不可避免地产生异常，此时为了让程序不中断，必须要将异常捕获掉。如果能提前得知可能会发生哪些异常，建议使用精确捕获，如果不知道会发生哪些异常，则使用 Exception 兜底。 另外异常也可以用来传递信息，比如生成器。 def gen(): yield 1 yield 2 return \"result\" g = gen()\nnext(g)\nnext(g)\ntry: next(g)\nexcept StopIteration as e: print(f\"返回值: {e.value}\") # 返回值: result 如果想要拿到生成器的返回值，我们需要让它抛出 StopIteration，然后进行捕获，再通过 value 属性拿到返回值。所以，Python 是将生成器的返回值封装到了异常里面。 之所以举这个例子，目的是想说明，异常并非是让人嗤之以鼻的东西，它也可以作为信息传递的载体。特别是在 Java 语言中，引入了 checked exception，方法的所有者还可以声明自己会抛出什么异常，然后调用者对异常进行处理。在 Java 程序启动时，抛出大量异常都是司空见惯的事情，并在相应的调用堆栈中将信息完整地记录下来。至此，Java 的异常不再是异常，而是一种很普遍的结构，从良性到灾难性都有所使用，异常的严重性由调用者来决定。 虽然在 Python 里面，异常还没有达到像 Java 异常那么高的地位，但使用频率也是很高的，下面我们就来剖析一下异常是怎么实现的？","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 楔子","id":"287","title":"楔子"},"288":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机，所以异常可以由编译器抛出，也可以由虚拟机剖出。如果是编译器抛出的异常，那么基本上都是 SyntaxError，即语法错误。 try: >>>\nexcept Exception as e: print(e) 比如上面这段代码，你会发现异常捕获根本没用，因为这是编译阶段就发生的错误，而异常捕获是在运行时进行的。当然语法不对属于低级错误，所以不会留到运行时。 然后是运行时产生的异常： try: 1 / 0\nexcept ZeroDivisionError: print(\"Division by zero\") 像这种语法正确，但程序执行时因逻辑出现问题而导致的异常，是可以被捕获的。对于我们来说，关注的显然是运行时产生的异常，比如 TypeError、IndexError 等等。 那么问题来了，异常本质上是什么呢？我们以列表为例，看看 IndexError 是怎么产生的。 lst = [1, 2, 3]\nprint(lst[3])\n\"\"\"\nIndexError: list index out of range\n\"\"\" 列表的最大索引是 2，但我们访问了索引为 3 的元素，虚拟机就知道不能再执行下去了，否则会访问非法内存。因此虚拟机的做法是：输出异常信息，结束进程。我们通过源码来验证一下： 在获取列表元素时发现索引不合法，就知道要抛出 IndexError 了，于是将异常写入到回溯栈中，并返回 NULL。正常情况下，返回值应该指向一个合法的对象，如果为 NULL，证明出现异常了。 此时虚拟机会将回溯栈里的异常抛出来（就是我们在控制台看到的那一抹鲜红），然后结束进程，这就是异常的本质。当然异常也是一个 Python 对象，虚拟机在退出前，会写入到 stderr 中。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常的本质是什么？","id":"288","title":"异常的本质是什么？"},"289":{"body":"当我们用 C 编写 Python 扩展时，如果想设置异常的话，该怎么做呢？首先设置异常之前，我们要知道有哪些异常。在 pyerrors.h 中，虚拟机内置了大量的异常，另外 Python 一切皆对象，因此异常也是一个对象。 有了异常之后，怎么写入呢？关于异常写入，底层也提供了相应的 C API。 PyErr_SetNone：设置异常，不包含提示信息。 PyErr_SetObject：设置异常，包含提示信息（Python 字符串）。 PyErr_SetString：设置异常，包含提示信息（C 字符串）。 PyErr_Occurred：检测回溯栈中是否有异常产生。 PyErr_Clear：将回溯栈中的异常清空，相当于 Python 的异常捕获。 PyErr_Fetch：将回溯栈中的异常清空，同时拿到它的 exc_type、exc_value、exc_tb。 PyErr_Restore：基于 exc_type、exc_value、exc_tb 设置异常。 我们以 PyErr_Restore 为例，看看异常的具体设置过程。 // Python/errors.c // PyErr_SetObject、PyErr_SetString 等等，最终都会调用 PyErr_Restore\nvoid\nPyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); _PyErr_Restore(tstate, type, value, traceback);\n} // 将异常设置在线程状态对象中\nvoid\n_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *traceback)\n{ PyObject *oldtype, *oldvalue, *oldtraceback; if (traceback != NULL && !PyTraceBack_Check(traceback)) { Py_DECREF(traceback); traceback = NULL; } // 获取线程状态对象中已存在的异常（可能为空） oldtype = tstate->curexc_type; oldvalue = tstate->curexc_value; oldtraceback = tstate->curexc_traceback; // 将新异常设置在线程状态对象中 tstate->curexc_type = type; tstate->curexc_value = value; tstate->curexc_traceback = traceback; // 减少旧异常的引用计数 Py_XDECREF(oldtype); Py_XDECREF(oldvalue); Py_XDECREF(oldtraceback);\n} 注意这里的 PyThreadState 对象，它是与线程相关的，但它只是线程信息的一个抽象描述，而真实的线程及状态肯定是由操作系统来维护和管理的。 但虚拟机在运行的时候总需要另外一些与线程相关的状态和信息，比如是否发生了异常等等，而这些信息显然操作系统是没办法提供的。而 PyThreadState 对象正是 Python 为线程准备的、在虚拟机层面保存线程状态信息的对象（后面简称线程状态对象、或者线程对象）。 当前活动线程（OS 原生线程）对应的 PyThreadState 对象可以通过 PyThreadState_GET 获得，在得到了线程状态对象之后，就将异常信息存放在里面。 关于线程相关的内容，后续会详细说。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常写入的一些 C API","id":"289","title":"异常写入的一些 C API"},"29":{"body":"创建对象可以使用泛型 API，也可以使用特定类型 API，比如创建一个浮点数。 使用泛型 API 创建 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type); 通过泛型 API 可以创建任意类型的对象，因为该类 API 和类型无关。那么问题来了，解释器怎么知道要给对象分配多大的内存呢？ 在介绍类型对象的时候我们提到，对象的内存大小、支持哪些操作等等，都属于元信息，而元信息会存在对应的类型对象中。其中 tp_basicsize 和 tp_itemsize 负责指定实例对象所需的内存空间。 // Include/objimpl.h // 创建定长对象\n#define PyObject_New(type, typeobj) \\ ( (type *) _PyObject_New(typeobj) )\n// 创建变长对象\n#define PyObject_NewVar(type, typeobj, n) \\ ( (type *) _PyObject_NewVar((typeobj), (n)) )\n/* 所以 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type) 等价于如下 * PyObject* pi = (PyObject *)_PyObject_New(&PyFloat_Type) */ 所以实际申请内存的动作由 _PyObject_New 和 _PyObject_NewVar 负责，看看它的逻辑。 // Objects/object.c\nPyObject *\n_PyObject_New(PyTypeObject *tp)\n{ PyObject *op; // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_SIZE(tp) op = (PyObject *) PyObject_MALLOC(_PyObject_SIZE(tp)); if (op == NULL) return PyErr_NoMemory(); // 设置对象的类型和引用计数 return PyObject_INIT(op, tp);\n} PyVarObject *\n_PyObject_NewVar(PyTypeObject *tp, Py_ssize_t nitems)\n{ PyVarObject *op; const size_t size = _PyObject_VAR_SIZE(tp, nitems); // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_VAR_SIZE(tp, nitems) op = (PyVarObject *) PyObject_MALLOC(size); if (op == NULL) return (PyVarObject *)PyErr_NoMemory(); // 设置对象的类型、引用计数和 ob_size return PyObject_INIT_VAR(op, tp, nitems);\n} // Include/objimpl.h\n#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) #define _PyObject_VAR_SIZE(typeobj, nitems) \\ _Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \\ (nitems)*(typeobj)->tp_itemsize, \\ SIZEOF_VOID_P)\n/* 类型对象的 tp_basicsize 字段表示它的实例对象的基础大小，即底层结构体的大小 * 对于像浮点数这种不可变的定长对象来说，显然大小就等于 PyFloat_Type 的 tp_basicsize * * 如果对象内部可以容纳指定数量的元素，比如元组，那么 tp_itemsize 便是每个元素的大小 * 对于元组来说，它的大小等于 tp_basicsize + 元素个数 * tp_itemsize，并且按照 8 字节对齐 */ 以上便是泛型 API 创建对象的流程，但泛型 API 属于通用逻辑，而内置类型的实例对象一般会采用特定类型 API 创建。 使用特定类型 API 创建 // 创建浮点数，值为 2.71\nPyObject* e = PyFloat_FromDouble(2.71);\n// 创建一个可以容纳 5 个元素的元组\nPyObject* tpl = PyTuple_New(5);\n// 创建一个可以容纳 5 个元素的列表\n// 当然这是初始容量，列表还可以扩容\nPyObject* lst = PyList_New(5); 和泛型 API 不同，使用特定类型 API 只能创建指定类型的对象，因为这种 API 是和类型绑定的。比如我们可以用 PyDict_New 创建一个字典，但不可能创建一个集合出来。 如果使用特定类型 API，那么可以直接分配内存。因为内置类型的实例对象，它们的定义在底层都是写死的，解释器对它们了如指掌，因此可以直接分配内存并初始化。 比如通过 e = 2.71 创建一个浮点数，解释器看到 2.71 就知道要创建 PyFloatObject 结构体实例，那么申请多大内存呢？显然是 sizeof(PyFloatObject)，直接计算一下结构体实例的大小即可。 // Include/floatobject.h\ntypedef struct { // ob_refcnt 占 8 字节，ob_type 也占 8 字节 PyObject_HEAD // 占 8 字节 double ob_fval;\n} PyFloatObject; 由于 PyFloatObject 只是在 PyObject 的基础上引入了一个 double 字段，用于维护浮点数的值，所以一个 PyFloatObject 实例的大小为 24 字节。既然内存大小知道，那么直接分配就可以了，分配之后再将 ob_refcnt 初始化为 1、将 ob_type 设置为 &PyFloat_Type、将 ob_fval 设置为 2.71 即可。 同理可变对象也是一样，因为字段都是固定的，容纳的元素个数也可以根据赋的值得到，所以内部的所有字段占用了多少内存可以算出来，因此也是可以直接分配内存的。 还是那句话，解释器对内置的数据结构了如指掌，因为这些结构在底层都是定义好的，源码直接写死了。所以解释器根本不需要借助类型对象去创建实例对象，它只需要在实例对象创建完毕之后，再将 ob_type 设置为指定的类型即可（让实例对象和类型对象建立联系）。 所以采用特定类型 API 创建实例的速度会更快，但这只适用于内置的数据结构，而我们自定义类的实例对象显然没有这个待遇。假设通过 class Person: 定义了一个类，那么在实例化的时候，显然不可能通过 PyPerson_New 去创建，因为底层压根就没有这个 API。这种情况下创建 Person 的实例对象就需要 Person 这个类型对象了，因此自定义类的实例对象如何分配内存、如何进行初始化，需要借助对应的类型对象。 总的来说，Python 内部创建一个对象有两种方式： 通过特定类型 API，适用于内置数据结构，即内置类型的实例对象。 通过调用类型对象去创建（底层会调用泛型 API），多用于自定义类型。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 对象是如何创建的","id":"29","title":"对象是如何创建的"},"290":{"body":"帧评估函数里面有一个巨型的 switch，负责执行字节码指令，如果执行出错，那么跳转到 error 标签。 如果在执行指令的时候出现了异常，那么会跳转到 error 这里，否则会跳转到其它地方。另外当出现异常时，会在线程状态对象中将异常信息记录下来，包括异常类型、异常值、回溯栈（traceback），这个 traceback 就是在 error 标签中调用 PyTraceBack_Here 创建的。 另外可能有人不清楚 traceback 是做什么的，我们举个 Python 的例子。 def h(): 1 / 0 def g(): h() def f(): g() f()\n\"\"\"\nTraceback (most recent call last): File \"/Users/.../main.py\", line 10, in <module> f() File \"/Users/.../main.py\", line 8, in f g() File \"/Users/.../main.py\", line 5, in g h() File \"/Users/.../main.py\", line 2, in h 1 / 0\nZeroDivisionError: division by zero\n\"\"\" 这是脚本运行时产生的错误输出，我们看到了函数调用的信息：比如在源代码的哪一行调用了哪一个函数，那么这些信息是从何而来的呢？没错，显然是 traceback 对象。虚拟机在处理异常的时候，会创建 traceback 对象，在该对象中记录栈帧的信息。虚拟机利用该对象来将栈帧链表中每一个栈帧的状态进行可视化，可视化的结果就是上面输出的异常信息。 而且我们发现输出的信息也是一个链状的结构，因为每一个栈帧都会对应一个 traceback 对象，这些 traceback 对象之间也会组成一个链表。 所以当虚拟机开始处理异常的时候，它首先的动作就是创建 traceback 对象，用于记录异常发生时活动栈帧的状态。创建方式是通过 PyTraceBack_Here 函数，它接收一个栈帧作为参数。 // Python/traceback.c\nint\nPyTraceBack_Here(PyFrameObject *frame)\n{ // 获取当前的异常对象，拿到它的 exc_type、exc_val、exc_tb PyObject *exc, *val, *tb, *newtb; PyErr_Fetch(&exc, &val, &tb); // 创建新的 traceback 对象，并和旧的 traceback 对象组成链表 newtb = _PyTraceBack_FromFrame(tb, frame); if (newtb == NULL) { _PyErr_ChainExceptions(exc, val, tb); return -1; } // 将异常设置在线程状态对象中 // 并且异常的 exc_type 和 exc_val 保持不变，但 traceback 是新的 traceback PyErr_Restore(exc, val, newtb); Py_XDECREF(tb); return 0;\n} 那么这个 traceback 对象究竟长什么样呢？ // Include/cpython/traceback.h\ntypedef struct _traceback { PyObject_HEAD struct _traceback *tb_next; struct _frame *tb_frame; int tb_lasti; int tb_lineno;\n} PyTracebackObject; 里面有一个 tb_next，所以很容易想到 traceback 也是一个链表结构。其实 traceback 对象的链表结构跟栈帧对象的链表结构是同构的、或者说一一对应的，即一个栈帧对象对应一个 traceback 对象。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 是什么？","id":"290","title":"traceback 是什么？"},"291":{"body":"在 PyTraceBack_Here 函数中我们看到，traceback 对象是通过 _PyTraceBack_FromFrame 创建的，那么秘密就隐藏在这个函数中。 // Python/traceback.c\n_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)\n{ assert(tb_next == NULL || PyTraceBack_Check(tb_next)); assert(frame != NULL); return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_lasti, PyFrame_GetLineNumber(frame));\n} static PyObject *\ntb_create_raw(PyTracebackObject *next, PyFrameObject *frame, int lasti, int lineno)\n{ PyTracebackObject *tb; if ((next != NULL && !PyTraceBack_Check(next)) || frame == NULL || !PyFrame_Check(frame)) { PyErr_BadInternalCall(); return NULL; } // 为 traceback 对象申请内存 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type); if (tb != NULL) { // 设置属性 Py_XINCREF(next); tb->tb_next = next; Py_XINCREF(frame); tb->tb_frame = frame; tb->tb_lasti = lasti; tb->tb_lineno = lineno; PyObject_GC_Track(tb); } return (PyObject *)tb;\n} tb_next 将两个 traceback 连接了起来，不过这个和栈帧的 f_back 正好相反，f_back 指向的是上一个栈帧，而 tb_next 指向的是下一个 traceback。 另外在 traceback 中，还通过 tb_frame 字段和对应的 PyFrameObject 对象建立了联系，当然还有最后执行完毕时的字节码偏移量、以及在源代码中对应的行号。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 创建","id":"291","title":"traceback 创建"},"292":{"body":"traceback 的创建我们知道了，那么它和栈帧对象是怎么联系起来的呢？我们还以之前的代码为例，来解释一下。 def h(): 1 / 0 def g(): h() def f(): g() f() 当执行到函数 h 的 1 / 0 这行代码时，底层会执行 BINARY_TRUE_DIVIDE 指令。 case TARGET(BINARY_TRUE_DIVIDE): { PyObject *divisor = POP(); PyObject *dividend = TOP(); // 调用了数值型对象的泛型 API PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); Py_DECREF(dividend); Py_DECREF(divisor); SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} // Objects/abctract.c\nPyObject *\nPyNumber_TrueDivide(PyObject *v, PyObject *w)\n{ return binary_op(v, w, NB_SLOT(nb_true_divide), \"/\");\n} #define NB_SLOT(x) offsetof(PyNumberMethods, x)\n// 最终会执行 (&PyLong_Type) -> tp_as_methods -> nb_true_divide\n// 即 long_true_divice 函数，看一下它的逻辑 // Objects/longobject.c\nstatic PyObject *\nlong_true_divide(PyObject *v, PyObject *w)\n{ // ... a_size = Py_ABS(Py_SIZE(a)); b_size = Py_ABS(Py_SIZE(b)); negate = (Py_SIZE(a) < 0) ^ (Py_SIZE(b) < 0); // 如果除数为 0，设置 ZeroDivisionError if (b_size == 0) { PyErr_SetString(PyExc_ZeroDivisionError, \"division by zero\"); goto error; } // ... error: return NULL;\n} 由于除数为 0，因此会通过 PyErr_SetString 设置一个异常进去，最终将异常类型、异常值、以及 traceback 保存到线程状态对象中。然后跳转到 error 标签，注意：当前是 long_true_divide 的 error 标签，然后会返回 NULL。 当 long_true_divide 返回 NULL 时，那么变量 quotient 拿到的就是 NULL，由于没有指向一个合法的 PyObject，虚拟机就意识到发生异常了，这时候会跳转到 error 标签。注意：这个 error 标签是帧评估函数里的 error 标签。 在里面会先取出线程状态对象中已有的 traceback 对象，然后以函数 h 的栈帧为参数，创建一个新的 traceback 对象，将两者通过 tb_next 关联起来。最后，再替换掉线程状态对象里面的 traceback 对象。 在虚拟机意识到有异常抛出，并创建了 traceback 之后，它会在当前栈帧中寻找 try except 语句，来执行开发人员指定的异常捕捉动作。如果没有找到，那么虚拟机将退出当前的活动栈帧，并沿着栈帧链回退到上一个栈帧（这里是函数 g 的栈帧），在上一个栈帧中寻找 try except 语句。 就像我们之前说的，函数调用会创建栈帧，当函数执行完毕或者出现异常时，会回退到上一级栈帧。一层一层创建、一层一层返回。至于回退的这个动作，则是在 _PyEval_EvalFrameDefault 的最后完成。 当出现异常时，虚拟机会进入 exception_unwind 标签寻找异常捕获逻辑，相关细节下一篇文章再说，这里就让它抛出去。然后来到 exit_returning 标签，将运行时栈清空。最后进入 exit_eval_frame 标签，将当前线程状态对象中的活跃栈帧设置为上一级栈帧，从而完成栈帧回退的动作。 当栈帧回退时，会进入函数 g 的栈帧，由于返回值为 NULL，所以知道自己调用的函数 h 的内部发生异常了（否则返回值一定会指向一个合法的 PyObject），那么继续寻找异常捕获语句。对于当前这个例子来说，显然是找不到的，于是会从线程状态对象中取出已有的 traceback 对象（函数 h 的栈帧对应的 traceback），然后以函数 g 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 异常会沿着栈帧链进行反向传播，函数 h 出现的异常被传播到了函数 g 中，显然接下来函数 g 要将异常传播到函数 f 中。因为函数 g 在无法捕获异常时，那么返回值也是 NULL，而函数 f 看到返回值为 NULL 时，同样会去寻找异常捕获语句。但是找不到，于是会从线程状态对象中取出已有的 traceback 对象（此时是函数 g 的栈帧对应的 traceback），然后以函数 f 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 最后再传播到模块对应的栈帧中，如果还无法捕获发生的异常，那么虚拟机就要将异常抛出来了。 这个沿着栈帧链不断回退的过程我们称之为栈帧展开，在栈帧展开的过程中，虚拟机不断地创建与各个栈帧对应的 traceback，并将其链接成链表。 由于没有异常捕获，那么接下来会调用 PyErr_Print。然后在 PyErr_Print 中，虚拟机取出维护的 traceback 链表，并进行遍历，将里面的信息逐个输出到 stderr 当中，最终就是我们在 Python 中看到的异常信息。 并且打印顺序是：.py文件、函数f、函数g、函数h。因为每一个栈帧对应一个 traceback，而栈帧又是往后退的，因此显然会从 .py文件对应的 traceback 开始打印，然后通过 tb_next 找到函数 f 对应的 traceback，依次下去。当异常信息全部输出完毕之后，解释器就结束运行了。 因此从链路的开始位置到结束位置，将整个调用过程都输出出来，可以很方便地定位问题出现在哪里。 另外，虽然 traceback 一直在更新（因为要对整个调用链路进行追踪），但是异常类型和异常值始终是不变的，就是函数 h 中抛出的 ZeroDivisionError: division by zero。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 栈帧展开","id":"292","title":"栈帧展开"},"293":{"body":"以上就是虚拟机抛异常的过程，异常在 Python 里面也是一个对象，和其它的实例对象并无本质区别。 exc = StopIteration(\"迭代结束了\")\nprint(exc.value) # 迭代结束了\nprint(exc.args) # ('迭代结束了',) exc = IndexError(\"索引越界了\")\nprint(exc.args) # ('索引越界了',) exc = Exception(\"不知道是啥异常，总之出问题了\")\nprint(exc.args) # ('不知道是啥异常，总之出问题了',) # 异常都有一个 args 属性，以元组的形式保存传递的参数 所谓抛出异常，就是将错误信息输出到 stderr 中，然后停止进程。并且除了虚拟机内部会抛出异常之外，我们还可以使用 raise 关键字手动引发一个异常。 def judge_score(score: int): if score > 100 or score < 0: raise ValueError(\"Score must be between 0 and 100\") 站在虚拟机的角度，score 取任何值都是合理的，但对于我们来说，希望 score 位于 0 ~ 100。那么当 score 不满足 0 ~ 100 时，就可以手动 raise 一个异常。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 小结","id":"293","title":"小结"},"3":{"body":"本文就说到这里，赶快下载 Python 3.8 源码，来和我一起学习 Python 吧（ヾ(◍°∇°◍)ﾉﾞ）。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"1. CPython 源码长什么样子？ » 小结","id":"3","title":"小结"},"30":{"body":"lst = [] 和 lst = list() 都会创建一个空列表，但这两种方式有什么区别呢？ 我们说创建实例对象可以通过解释器提供的特定类型 API，用于内置类型；也可以通过实例化类型对象去创建，既可用于自定义类型，也可用于内置类型。 # 通过特定类型 API 创建\n>>> lst = [] >>> lst\n[]\n# 通过调用类型对象创建\n>>> lst = list() >>> lst\n[] 还是那句话，解释器对内置数据结构了如指掌，并且做足了优化。 看到 123，就知道创建 PyLongObject 实例； 看到 2.71，就知道创建 PyFloatObject 实例； 看到 ( )，就知道创建 PyTupleObject 实例； 看到 [ ]，就知道创建 PyListObject 实例； ······ 这些都会使用特定类型 API 去创建，直接为结构体申请内存，然后设置引用计数和类型，所以使用 [ ] 创建列表是最快的。但如果使用 list() 创建列表，那么就产生了一个调用，要进行参数解析、类型检测、创建栈帧、销毁栈帧等等，所以开销会大一些。 import time start = time.perf_counter()\nfor _ in range(10000000): lst = []\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.2144167000001289\n\"\"\" start = time.perf_counter()\nfor _ in range(10000000): lst = list()\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.4079916000000594\n\"\"\" 通过 [ ] 的方式创建一千万次空列表需要 0.21 秒，但通过 list() 的方式创建一千万次空列表需要 0.40 秒，主要就在于 list() 是一个调用，而 [ ] 会直接被解析成 PyListObject，因此 [ ] 的速度会更快一些。 所以对于内置类型的实例对象而言，使用特定类型 API 创建要更快一些。而且事实上通过类型对象去创建的话，会先调用 tp_new，然后在 tp_new 内部还是调用了特定类型 API。 比如： 创建列表：可以是 list()、也可以是 [ ]； 创建元组：可以是 tuple()、也可以是 ( )； 创建字典：可以是 dict()、也可以是 { }； 前者是通过类型对象创建的，后者是通过特定类型 API 创建的。对于内置类型的实例对象而言，我们推荐使用特定类型 API 创建，会直接解析为对应的 C 一级数据结构，因为这些结构在底层都是已经实现好了的，可以直接用。而无需通过诸如 list() 这种调用类型对象的方式来创建，因为它们内部最终还是使用了特定类型 API，相当于多绕了一圈。 不过以上都是针对内置类型，而自定义的类型就没有这个待遇了，它的实例对象只能通过调用它自己创建。比如 Person 这个类，解释器不可能事先定义一个 PyPersonObject 然后将 API 提供给我们，所以我们只能通过调用 Person 来创建它的实例对象。 另外内置类型被称为静态类，它和它的实例对象在底层已经定义好了，无法动态修改。我们自定义的类型被称为动态类，它是在解释器运行的过程中动态构建的，所以我们可以对其进行动态修改。 事实上 Python 的动态性、GIL 等特性，都是解释器在将字节码翻译成 C 代码时动态赋予的，而内置类型在编译之后已经是指向 C 一级的数据结构，因此也就丧失了相应的动态性。不过与之对应的就是效率上的提升，因为运行效率和动态性本身就是鱼与熊掌的关系。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » [] 和 list()，应该使用哪种方式","id":"30","title":"[] 和 list()，应该使用哪种方式"},"31":{"body":"以上我们就简单分析了 Python 对象的创建过程，当然这只是一个开头，其背后还隐藏了大量的细节，我们后续会慢慢说。 下一篇文章来聊一聊，对象是如何被调用的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"31","title":"小结"},"32":{"body":"在上一篇文章中，我们分析了对象是如何创建的，主要有两种方式，一种是通过特定类型 API，另一种是通过调用类型对象。 对于内置类型的实例对象而言，这两种方式都是支持的，比如列表，我们既可以通过 [ ] 创建，也可以通过 list() 创建，前者是列表的特定类型 API，后者是调用类型对象。但对于自定义类的实例对象而言，我们只能通过调用类型对象的方式来创建。 而一个对象如果可以被调用，那么这个对象就是 callable，否则就不是 callable。那么问题来了，如果一个对象是 callable，那么它都具有哪些特征呢？ 从 Python 的角度看，如果对象是 callable，那么它的类型对象一定实现了 __call__ 函数； 从解释器的角度看，如果对象是 callable，那么它的类型对象的 tp_call 字段一定不为空。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"32","title":"楔子"},"33":{"body":"调用 int 可以创建一个整数，调用 str 可以创建一个字符串，调用 tuple 可以创建一个元组，调用自定义的类也可以创建出相应的实例对象，这就说明类型对象是可调用的，也就是 callable。既然类型对象可调用，那么类型对象的类型对象（type）内部一定实现了 __call__ 函数。 # int 可以调用，那么它的类型对象、也就是元类（type）一定实现了 __call__ 函数\nprint(hasattr(type, \"__call__\")) # True # 而调用一个对象，等价于调用其类型对象的 __call__ 函数\n# 所以 int(2.71) 实际上就等价于如下\nprint(type.__call__(int, 2.71)) # 2 我们说 int、str、float 这些都是类型对象（简单来说就是类），而 123、\"你好\"、2.71 是其对应的实例对象，这些都没问题。但如果相对 type 而言，int、str、float 是不是又成了实例对象呢？因为它们的类型都是 type。 所以 class 具有二象性： 如果站在实例对象（如：123、\"你好\"、2.71）的角度上，它是类型对象； 如果站在 type 的角度上，它是实例对象； 同理，由于 type 的类型还是 type，那么 type 既是 type 的类型对象，type 也是 type 的实例对象。虽然这里描述的有一些绕，但应该不难理解，而为了避免后续的描述出现歧义，这里我们做一个申明： 整数、浮点数、字符串、列表等等，我们称之为实例对象 int、float、str、dict，以及自定义的类，我们称之为类型对象 type 虽然也是类型对象，但我们称它为元类 由于 type 的内部定义了 __call__ 函数，那么说明类型对象都是可调用的，因为调用类型对象就是调用元类 type 的 __call__ 函数。而实例对象能否调用就不一定了，这取决于它的类型对象是否定义了 __call__ 函数，因为调用一个对象，本质上是调用其类型对象内部的 __call__ 函数。 class A: pass a = A()\n# 因为自定义的类 A 里面没有 __call__\n# 所以 a 是不可以被调用的\ntry: a()\nexcept Exception as e: # 告诉我们 A 的实例对象无法被调用 print(e) # 'A' object is not callable # 如果我们给 A 设置了一个 __call__\ntype.__setattr__(A, \"__call__\", lambda self: \"这是__call__\")\n# 发现可以调用了\nprint(a()) # 这是__call__ 这就是动态语言的特性，即便在类创建完毕之后，依旧可以通过 type 进行动态设置，而这在静态语言中是不支持的。所以 type 是所有类的元类，它控制了自定义类的生成过程，因此 type 这个古老而又强大的类可以让我们玩出很多新花样。 但对于内置的类，type 是不可以对其动态增加、删除或者修改属性的，因为内置的类在底层是静态定义好的。从源码中我们看到，这些内置的类、包括元类，它们都是 PyTypeObject 对象，在底层已经被声明为全局变量了，或者说它们已经作为静态类存在了。所以 type 虽然是所有类型对象的类型，但只有面对自定义的动态类，type 才具有对属性进行增删改的能力。 而且在上一篇文章中我们也解释过，Python 的动态性是解释器将字节码翻译成 C 代码的时候赋予的，因此给类对象动态设置属性只适用于动态类，也就是在 py 文件中使用 class 关键字定义的类。而对于静态类，它们在编译之后已经是指向 C 一级的数据结构了，不需要再被解释器解释了，因此解释器自然也就无法在它们身上动手脚，毕竟彪悍的人生不需要解释。 try: type.__setattr__(dict, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'dict' \"\"\" try: type.__setattr__(list, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'list' \"\"\" 同理其实例对象亦是如此，静态类的实例对象也不可以动态设置属性： lst = list()\ntry: lst.name = \"古明地觉\"\nexcept Exception as e: print(e) # 'list' object has no attribute 'name' 在介绍 PyTypeObject 结构体的时候我们说过，静态类的实例对象可以绑定哪些属性，已经写死在 tp_members 字段里面了。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从 Python 的角度看对象的调用","id":"33","title":"从 Python 的角度看对象的调用"},"34":{"body":"如果一个对象可以被调用，那么它的类型对象中一定要有 tp_call，更准确的说是 tp_call 字段的值是一个具体的函数指针，而不是 0。由于 PyList_Type 是可以调用的，这就说明 PyType_Type 内部的 tp_call 是一个函数指针，这在 Python 的层面我们已经验证过了，下面再来通过源码看一下。 在创建 PyType_Type 的时候，PyTypeObject 内部的 tp_call 字段被设置成了 type_call。所以当我们调用 PyList_Type 的时候，会执行 type_call 函数。 因此 list() 在 C 的层面上等价于： (&PyList_Type)->ob_type->tp_call(&PyList_Type, args, kwargs);\n// 即：\n(&PyType_Type)->tp_call(&PyList_Type, args, kwargs);\n// 而在创建 PyType_Type 的时候，给 tp_call 字段传递的是 type_call\n// 因此最终等价于\ntype_call(&PyList_Type, args, kwargs) 如果用 Python 来演示这一过程的话： # 以 list(\"abcd\") 为例，它等价于\nlst1 = list.__class__.__call__(list, \"abcd\")\n# 等价于\nlst2 = type.__call__(list, \"abcd\")\nprint(lst1) # ['a', 'b', 'c', 'd']\nprint(lst2) # ['a', 'b', 'c', 'd'] 这就是 list() 的秘密，相信其它类型在实例化的时候是怎么做的，你已经知道了，做法是相同的。 # dct = dict([(\"name\", \"古明地觉\"), (\"age\", 17)])\ndct = dict.__class__.__call__( dict, [(\"name\", \"古明地觉\"), (\"age\", 17)]\n)\nprint(dct) # {'name': '古明地觉', 'age': 17} # buf = bytes(\"hello world\", encoding=\"utf-8\")\nbuf = bytes.__class__.__call__( bytes, \"hello world\", encoding=\"utf-8\"\n)\nprint(buf) # b'hello world' 当然，目前还没有结束，我们还需要看一下 type_call 的源码实现。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从解释器的角度看对象的调用","id":"34","title":"从解释器的角度看对象的调用"},"35":{"body":"调用类型对象，本质上会调用 type.__call__，在底层对应 type_call 函数，因为 PyType_Type 的 tp_call 字段被设置成了 type_call。当然调用 type 也是如此，因为 type 的类型还是 type。 那么这个 type_call 都做了哪些事情呢？ // Objects/typeobject.c static PyObject *\ntype_call(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 参数 type 表示类型对象或者元类，假设调用的是 list，那么它就是 &PyList_Type // 参数 args 和 kwds 表示位置参数和关键字参数，args 是元组，kwds 是字典 // 指向创建的实例对象，当然也可能是类型对象，取决于参数 type // 如果参数 type 表示元类，那么 obj 会指向类型对象，并且是自定义的动态类 // 如果参数 type 表示类型对象，那么 obj 会指向实例对象 PyObject *obj; // 执行类型对象（也可能是元类）的 tp_new，也就是 __new__ // 如果不存在，那么会报错，而在 Python 中见到的报错信息就是这里指定的 if (type->tp_new == NULL) { PyErr_Format(PyExc_TypeError, \"cannot create '%.100s' instances\", type->tp_name); return NULL; } obj = type->tp_new(type, args, kwds); // 检测调用是否正常，如果调用正常，那么 obj 一定指向一个合法的 PyObject // 而如果 obj 为 NULL，则表示执行出错，此时解释器会抛出异常 obj = _Py_CheckFunctionResult((PyObject*)type, obj, NULL); if (obj == NULL) return NULL; // 这里要做一个额外判断： // 如果参数 type 是 &PyType_Type，也就是 Python 中的元类 // 那么它可以接收一个位置参数（查看对象类型），也可以接收三个位置参数（创建自定义类） // 所以当 type 是 &PyType_Type，位置参数的个数为 1，并且没有传递关键字参数时 // 那么表示查看对象的类型，此时直接返回 obj 即可 if (type == &PyType_Type && PyTuple_Check(args) && PyTuple_GET_SIZE(args) == 1 && (kwds == NULL || (PyDict_Check(kwds) && PyDict_GET_SIZE(kwds) == 0))) return obj; // 到这里说明不是查看对象类型，而是创建类或者实例 // 如果参数 type 是元类，那么表示创建类，此时 args 的长度必须为 3 // 如果参数 type 是类型对象，那么表示创建实例对象 // 所以为了描述方便，我们就假设参数 type 是类型对象，但我们知道它也可以是元类 // 总之到这里 __new__ 已经执行完了，那么之后该干啥了？显然是执行 __init__，但需要先做一个检测 // 如果 __new__ 返回的实例对象的类型不是当前类型，那么直接返回，不再执行 __init__ // 比如自定义 class A，那么在 __new__ 里面应该返回 A 的实例对象，但我们故意返回个 123 // 由于返回值的类型不是当前类型，那么不再执行初始化函数 __init__ if (!PyType_IsSubtype(Py_TYPE(obj), type)) return obj; // 走到这里说明类型一致，那么执行 __init__，将 obj、args、kwds 一起传过去 type = Py_TYPE(obj); if (type->tp_init != NULL) { int res = type->tp_init(obj, args, kwds); if (res < 0) { assert(PyErr_Occurred()); Py_DECREF(obj); obj = NULL; } else { assert(!PyErr_Occurred()); } } // 返回创建的对象 obj，当然准确来说是对象的泛型指针 // 因为 Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针 // 只是有时为了描述方便，我们会说成是对象，这一点我们心里清楚就好 return obj;\n} 所以整个过程就三步： 如果传递的是元类，并且只有一个参数，那么直接返回对象的类型； 否则先调用 tp_new 为实例对象申请内存； 再调用 tp_init（如果有）进行初始化，设置对象属性； 所以这对应了 Python 中的 __new__ 和 __init__，其中 __new__ 负责为实例对象开辟一份内存，然后返回指向对象的指针，并且该指针会自动传递给 __init__ 中的 self。 class Girl: def __new__(cls, name, age): print(\"__new__ 方法执行啦\") # 调用 object.__new__(cls) 创建 Girl 的实例对象 # 然后该对象的指针会自动传递给 __init__ 中的 self return object.__new__(cls) def __init__(self, name, age): print(\"__init__ 方法执行啦\") self.name = name self.age = age g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n__new__ 方法执行啦\n__init__ 方法执行啦\n古明地觉 16\n\"\"\" __new__ 里面的参数要和 __init__ 里面的参数保持一致，因为会先执行 __new__ ，然后解释器再将 __new__ 的返回值和传递的参数组合起来一起传给 __init__。因此从这个角度上讲，设置属性完全可以在 __new__ 里面完成。 class Girl: def __new__(cls, name, age): self = object.__new__(cls) self.name = name self.age = age return self g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n古明地觉 16\n\"\"\" 这样也是没问题的，不过 __new__ 一般只负责创建实例，设置属性应该交给 __init__ 来做，毕竟一个是构造函数、一个是初始化函数，各司其职。另外由于 __new__ 里面不负责初始化，那么它的参数除了 cls 之外，一般都会写成 *args 和 **kwargs。 然后再回过头来看一下 type_call 中的这两行代码： tp_new 应该返回该类型对象的实例对象，而且一般情况下我们是不重写 __new__ 的，会默认执行 object 的 __new__。但如果我们重写了，那么必须要手动返回 object.__new__(cls)。可如果我们不返回，或者返回其它的话，会怎么样呢？ class Girl: def __new__(cls, *args, **kwargs): print(\"__new__ 方法执行啦\") instance = object.__new__(cls) # 打印看看 instance 到底是个啥 print(\"instance:\", instance) print(\"type(instance):\", type(instance)) # 正确做法是将 instance 返回 # 但是我们不返回，而是返回一个整数 123 return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\n\"\"\"\n__new__ 方法执行啦\ninstance: <__main__.Girl object at 0x0000019A2B7270A0>\ntype(instance): <class '__main__.Girl'>\n\"\"\" 这里面有很多可以说的点，首先就是 __init__ 里面需要两个参数，但是我们没有传，却还不报错。原因就在于这个 __init__ 压根就没有执行，因为 __new__ 返回的不是 Girl 的实例对象。 通过打印 instance，我们知道了 object.__new__(cls) 返回的就是 cls 的实例对象，而这里的 cls 就是 Girl 这个类本身。所以我们必须要返回 instance，才会自动执行相应的 __init__。 我们在外部来打印一下创建的实例对象吧，看看结果： class Girl: def __new__(cls, *args, **kwargs): return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\nprint(g)\n\"\"\"\n123\n\"\"\" 我们看到打印的结果是 123，所以再次总结一下 tp_new 和 tp_init 之间的区别，当然也对应 __new__ 和 __init__ 的区别： tp_new：为实例对象申请内存，底层会调用 tp_alloc，至于对象的大小则记录在 tp_basicsize 字段中，而在 Python 里面则是调用 object.__new__(cls)，然后一定要将实例对象返回； tp_init：tp_new 的返回值会自动传递给 self，然后为 self 绑定相应的属性，也就是进行实例对象的初始化； 但如果 tp_new 返回的对象的类型不对，比如 type_call 的第一个参数接收的是 &PyList_Type，但 tp_new 返回的却是 PyTupleObject *，那么此时就不会执行 tp_init。对应上面的 Python 代码就是，Girl 的 __new__ 应该返回 Girl 的实例对象（指针）才对，但却返回了整数，因此类型不一致，不会执行 __init__。 所以都说类在实例化的时候会先调用 __new__，再调用 __init__，相信你应该知道原因了，因为在源码中先调用 tp_new，再调用 tp_init。所以源码层面表现出来的，和我们在 Python 层面看到的是一样的。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » type_call 源码解析","id":"35","title":"type_call 源码解析"},"36":{"body":"到此，我们就从 Python 和解释器两个层面剖析了对象是如何调用的，更准确的说，我们是从解释器的角度对 Python 层面的知识进行了验证，通过 tp_new 和 tp_init 的关系，来了解 __new__ 和 __init__ 的关系。 当然对象调用还不止目前说的这么简单，更多的细节隐藏在了幕后。后续我们会循序渐进，一点点地揭开它的面纱，并且在这个过程中还会不断地学习到新的东西。比如说，实例对象在调用方法的时候会自动将实例本身作为参数传递给 self，那么它为什么会传递呢？解释器在背后又做了什么工作呢？这些在之后的文章中都会详细说明。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"36","title":"小结"},"37":{"body":"之前我们提到了泛型 API，这类 API 的特点是可以处理任意类型的对象，举个例子。 // 返回对象的长度\nPyObject_Size\n// 返回对象的某个属性的值\nPyObject_GetAttr\n// 返回对象的哈希值\nPyObject_Hash\n// 将对象转成字符串后返回\nPyObject_Str 对应到 Python 代码中，就是下面这个样子。 # PyObject_Size\nprint(len(\"古明地觉\"))\nprint(len([1, 2, 3]))\n\"\"\"\n4\n3\n\"\"\" # PyObject_GetAttr\nprint(getattr(\"古明地觉\", \"lower\"))\nprint(getattr([1, 2, 3], \"append\"))\nprint(getattr({}, \"update\"))\n\"\"\"\n<built-in method lower of str object at 0x7f081aa7e920>\n<built-in method append of list object at 0x7f081adc1100>\n<built-in method update of dict object at 0x7f081aa8fd80>\n\"\"\" # PyObject_Hash\nprint(hash(\"古明地觉\"))\nprint(hash(2.71))\nprint(hash(123))\n\"\"\"\n8152506393378233203\n1637148536541722626\n123\n\"\"\" # PyObject_Str\nprint(str(\"古明地觉\"))\nprint(str(object()))\n\"\"\"\n古明地觉\n<object object at 0x7fdfa0209d10>\n\"\"\" 这些 API 能处理任意类型的对象，这究竟是怎么办到的？要想搞清楚这一点，还是要从 PyObject 入手。 我们知道对象在 C 看来就是一个结构体实例，并且结构体嵌套了 PyObject。 # 创建一个浮点数，让变量 var 指向它\nvar = 2.71\n# 创建一个列表，让变量 var 指向它\nvar = [1, 2, 3] 浮点数对应的结构体是 PyFloatObject，列表对应的结构体是 PyListObject，变量 var 是指向对象的指针。那么问题来了，凭啥一个变量可以指向不同类型的对象呢？或者说变量和容器里面为什么可以保存不同对象的指针呢？ 原因在前面的文章中解释的很详细了，因为对象的指针会统一转成 PyObject * 之后再交给变量保存，以创建列表为例。 当然创建浮点数也是同理，因此变量和容器里的元素本质上就是一个泛型指针 PyObject *。而对象的指针在交给变量保存的时候，也都会先转成 PyObject *，因为不管什么对象，它底层的结构体都嵌套了 PyObject。正是因为这个设计，变量才能指向任意的对象。 所以 Python 变量相当于一个便利贴，可以贴在任意对象上。 不过问题来了，由于对象的指针会统一转成 PyObject * 之后再交给变量保存，那么变量怎么知道自己指向的是哪种类型的对象呢？相信你肯定知道答案：通过 ob_type 字段。 对象对应的结构体可以有很多个字段，比如 PyListObject，但变量能看到的只有前两个字段。至于之后的字段是什么，则取决于对象的类型。 所以变量会先通过 ob_type 字段获取对象的类型，如果 ob_type 字段的值为 &PyList_Type，那么变量指向的就是 PyListObject。如果 ob_type 字段的值为 &PyFloat_Type，那么变量指向的就是 PyFloatObject，其它类型同理。当得到了对象的类型，那么再转成相应的指针即可，假设 ob_type 是 &PyList_Type，那么变量会再转成 PyListObject *，这样就可以操作列表的其它字段了。 所以我们再总结一下： 变量和容器里的元素只能保存相同的指针类型，而不同类型的对象，其底层的结构体是不同的。但这些结构体无一例外都嵌套了 PyObject，因此它们的指针会统一转成 PyObject * 之后再交给变量保存。 然后变量在操作对象时，会先通过 ob_type 判断对象的类型，假如是 &PyList_Type，那么会再转成 PyListObject *，其它类型同理。我们以获取列表元素为例： 相信你已经知道为什么泛型 API 可以处理任意类型的对象了，我们再以 PyObject_GetAttr 为例，它内部会调用类型对象的 tp_getattro。 // Objects/object.c // 等价于 getattr(v, name)\nPyObject *\nPyObject_GetAttr(PyObject *v, PyObject *name)\n{ // 获取对象 v 的类型对象 PyTypeObject *tp = Py_TYPE(v); // 属性名称必须是字符串 if (!PyUnicode_Check(name)) { PyErr_Format(PyExc_TypeError, \"attribute name must be string, not '%.200s'\", name->ob_type->tp_name); return NULL; } // 如果类型对象实现了 tp_getattro，那么进行调用 // 等价于 Python 中的 type(v).__getattr__(v, name) if (tp->tp_getattro != NULL) return (*tp->tp_getattro)(v, name); // 否则会退化为 tp_getattr，它要求属性名称必须是 C 字符串 // 不过 tp_getattr 已经废弃，应该使用 tp_getattro if (tp->tp_getattr != NULL) { const char *name_str = PyUnicode_AsUTF8(name); if (name_str == NULL) return NULL; return (*tp->tp_getattr)(v, (char *)name_str); } // 否则说明对象 v 没有该属性 PyErr_Format(PyExc_AttributeError, \"'%.50s' object has no attribute '%U'\", tp->tp_name, name); return NULL;\n} 函数先通过 ob_type 找到对象的类型，然后通过类型对象的 tp_getattro 调用对应的属性查找函数。所以对象的类型不同，PyObject_GetAttr 调用的属性查找函数也不同，而这就是泛型 API 能处理任意对象的秘密。 我们再以 Python 代码为例： class A: def __getattr__(self, item): return f\"class：A，item：{item}\" class B: def __getattr__(self, item): return f\"class：B，item：{item}\" a = A()\nb = B()\nprint(getattr(a, \"some_attr\"))\nprint(getattr(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\"\n# 以上等价于\nprint(type(a).__getattr__(a, \"some_attr\"))\nprint(type(b).__getattr__(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\" 在 Python 里的表现和源码是一致的，我们再举个 iter 的例子： data = [1, 2, 3]\nprint(iter(data))\nprint(type(data).__iter__(data))\n\"\"\"\n<list_iterator object at 0x7fb8200f29a0>\n<list_iterator object at 0x7fb8200f29a0>\n\"\"\" 如果一个对象支持创建迭代器，那么它的类型对象一定实现了 __iter__，通过 type(data) 可以获取到类型对象，然后再将 data 作为参数调用 __iter__ 即可。 所以通过 ob_type 字段，这些泛型 API 实现了类似多态的效果，一个函数，多种实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"9. 再探泛型 API，感受 Python 对象的设计哲学","id":"37","title":"9. 再探泛型 API，感受 Python 对象的设计哲学"},"38":{"body":"我们知道所有类型对象在底层都由结构体 PyTypeObject 实例化得到，但内部字段接收的值不同，得到的类型对象就不同。类型对象不同，那么实例对象的表现就不同，这也正是一种对象区别于另一种对象的关键所在。 比如 PyLong_Type 的 tp_iter 是空，那么整数就不是可迭代对象，而 PyList_Type 的 tp_iter 不是空，那么列表就是可迭代对象。再比如 PyLong_Type 和 PyFloat_Type，虽然内部都实现了 tp_hash，但它们是不同的类型，所以整数和浮点数的哈希值计算方式也不一样。 因此类型对象决定了实例对象的行为，比如能否调用、能否计算哈希值、能否迭代等等，这些都由类型对象决定。 PyTypeObject 里面定义了很多函数指针，比如 tp_call、tp_hash 等等，它们可能指向某个具体的函数，也可能为空。这些函数指针可以看做是类型对象所定义的操作，这些操作决定了其实例对象在运行时的行为。 class A: # tp_new def __new__(cls, *args, **kwargs): pass # tp_init def __init__(self): pass # tp_call def __call__(self): pass # tp_getattro def __getattr__(self, attr): pass # tp_setattro def __setattr__(self, key, value): pass ... ... 像 tp_call、tp_hash、tp_new 等字段会直接对应 Python 里的魔法函数，它们以双下划线开头、以双下划线结尾。但除了魔法函数之外，每种类型还可以有很多自定义的成员函数。 # 自定义 foo 和 bar\nclass A: def foo(self): pass def bar(self): pass # 当然内置类型也是如此\n# 像 str 定义了 join、split、upper 等\nprint(str.join)\nprint(str.split)\nprint(str.upper)\n# 像 list 定义了 append、extend，insert 等\nprint(list.append)\nprint(list.extend)\nprint(list.insert) 这些自定义的函数会一起保存在类型对象的 tp_methods 里面，负责让实例对象更具有表现力。另外需要补充的是，类型对象里面定义的是函数，也叫成员函数，但实例对象在获取之后会自动包装成方法。所以当提到魔法函数和魔法方法时，其实表达的是同一个意思，只不过一个是站在类的角度，一个是站在实例的角度。 所以实例对象能调用的方法都定义在类型对象里面，并且通过实例调用本质上就是一个语法糖，但用起来更加优雅。假设有一个类 A，实例对象为 a，那么 a.some() 底层会转成 A.some(a)，至于这背后的细节后续再聊。 但除了以上这些，PyTypeObject 还提供了三个字段。 每个字段分别指向一个结构体实例，结构体实例中有大量的字段，这些字段都是函数指针，指向了具体的函数。所以它们也被称为方法簇，分别应用于如下操作。 tp_as_number：负责数值型操作，比如整数、浮点数的加减乘除； tp_as_sequence：负责序列型操作，比如字符串、列表、元组等通过索引取值的行为； tp_as_mapping：负责映射型操作，比如字典通过 key 映射出 value； 我们以 tp_as_number 为例，它指向 PyNumberMethods 类型的结构体实例，那么这个结构体长什么样子呢？ // Include/cpython/object.h typedef struct { // __add__，对应 + 操作符，如 a + b binaryfunc nb_add; // __sub__，对应 - 操作符，如 a - b binaryfunc nb_subtract; // __mul__，对应 * 操作符，如 a * b binaryfunc nb_multiply; // __mod__，对应 % 操作符，如 a % b binaryfunc nb_remainder; // __divmod__，对应 divmode 函数，如 divmod(a, b) binaryfunc nb_divmod; // __power__，对应 ** 操作符，如 a ** b ternaryfunc nb_power; // __neg__，对应 - 操作符，如 -a unaryfunc nb_negative; // __pos__，对应 + 操作符，如 +a unaryfunc nb_positive; // __abs__，对应 abs 函数，如 abs(a) unaryfunc nb_absolute; // __bool__，如 bool(a) inquiry nb_bool; // __invert__，对应 ~ 操作符，如 ~a unaryfunc nb_invert; // __lshift__，对应 << 操作符，如 a << b binaryfunc nb_lshift; // __rshift__，对应 >> 操作符，如 a >> b binaryfunc nb_rshift; // __and__，对应 & 操作符，如 a & b binaryfunc nb_and; // __xor__，对应 ^ 操作符，如 a ^ b binaryfunc nb_xor; // __or__，对应 | 操作符，如 a | b binaryfunc nb_or; // __int__，如 int(a) unaryfunc nb_int; // ...\n} PyNumberMethods; 你看到了什么？是不是想到了 Python 里面的魔法方法，所以它们也被称为方法簇。 在 PyNumberMethods 这个方法簇里面定义了作为一个数值对象应该支持的操作，同理，在 PySequenceMethods 和 PyMappingMethods 中分别定义了作为一个序列对象和映射对象应该支持的操作，这两种对象的典型例子就是 list 和 dict。 所以，只要类型对象提供相关操作，实例对象便具备对应的行为，因为实例对象所调用的方法都是由类型对象提供的。 class Girl: def __init__(self, name, age): self.name = name self.age = age def say(self): pass def cry(self): pass g = Girl(\"古明地觉\", 16)\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16}\nprint(\"say\" in Girl.__dict__) # True\nprint(\"cry\" in Girl.__dict__) # True 实例对象的属性字典，只包含了一些在 __init__ 里面设置的属性而已，而实例能够调用的 say、cry 都是定义在类型对象中的。 因此一定要记住：类型对象定义的操作，决定了实例对象的行为。 class Int(int): def __getitem__(self, item): return item a = Int(1)\nb = Int(2) print(a + b) # 3\nprint(a[\"你好\"]) # 你好 继承了 int 的自定义类 Int 在实例化之后自然是一个数值对象，但 a[\"\"] 却是一个类似于字典才具有的行为，那为什么可以实现呢？原因就是我们重写了 __getitem__ 这个魔法函数，它在底层对应 PyMappingMethods 中的 mp_subscript 操作，因此最终 Int 实例对象表现的像一个字典一样。 归根结底就在于这几个方法簇都只是 PyTypeObject 的一个字段罢了，默认使用 PyTypeObject 结构体创建的 PyLong_Type 所生成的实例对象（整数）是不具备列表和字典的属性特征的。但我们通过继承 PyLong_Type，同时指定 __getitem__，使得构建出来的类型对象所生成的实例对象，同时具备多种属性特征，就是因为解释器支持这种做法。 自定义的类在底层也是 PyTypeObject 结构体实例，而在继承 int 的时候，将其内部定义的 PyNumberMethods 方法簇也继承了下来，而我们又单独实现了 PyMappingMethods 中的 mp_subscript。所以自定义类 Int 的实例对象具备了整数的全部行为，以及字典的部分行为（因为我们只实现了 __getitem__）。 下面再通过 PyLong_Type 实际考察一下： 整数对象支持数值操作，所以在创建 PyLong_Type 时，实现了 tp_as_number。但整数显然不支持序列和映射操作，因此字段 tp_as_sequence 和 tp_as_mapping 就是 0，相当于空。 而 tp_as_number 字段被赋值为 long_as_number，看一下它长什么样。 里面的 long_add、long_sub、long_mul 等等显然都是已经定义好的函数指针，在创建 PyNumberMethods 结构体实例 long_as_number 的时候，这些函数指针分别赋值给了字段 nb_add、nb_substract、nb_multiply 等等。然后创建完 long_as_number 之后，再将其指针交给 PyLong_Type 的 tp_as_number 字段。 因此整数在操作的时候，比如相加，会先通过 变量->ob_type->tp_as_number->nb_add 获取该操作对应的函数指针，其中 int 类型对象的 tp_as_number 字段的值是 &long_as_number，因此获取其字段 nb_add 的时候，拿到的就是 long_add 函数指针，然后调用。 同理 float 类型里的 tp_as_number 字段则被赋值成了 &float_as_number，获取 nb_add 字段的时候，拿到的就是 float_add 函数指针。不同类型的对象的行为不同，它们都有属于自己的一组方法簇。 最后再画一张图总结一下，假设有两个变量，分别是 e = 2.71 和 num = 666。 所以对象的行为是由其类型对象定义的操作所决定的，比如一个对象可以计算长度，那么它的类型对象要实现 __len__；一个对象可以转成整数，那么它的类型对象要实现 __int__ 或 __index__。 class A: def __len__(self): return 123 def __int__(self): return 456 a = A()\nprint(len(a)) # 123\nprint(int(a)) # 456\n# len(a) 在底层会执行 A.__len__(a)\n# int(a) 在底层会执行 A.__int__(a)\nprint(A.__len__(a)) # 123\nprint(A.__int__(a)) # 456 总之核心就是一句话：类型对象定义了哪些操作，决定了实例对象具有哪些行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"10. Python 对象的行为是怎么区分的？","id":"38","title":"10. Python 对象的行为是怎么区分的？"},"39":{"body":"如果对编程语言进行分类的话，一般可以分为静态语言和动态语言，也可以分为编译型语言和解释型语言。但个人觉得还有一种划分标准，就是是否自带垃圾回收。关于有没有垃圾回收，陈儒老师在《Python 2.5源码剖析》中，总结得非常好。 对于像 C 和 C++ 这类语言，程序员被赋予了极大的自由，可以任意地申请内存。但权力的另一面对应着责任，程序员最后不使用的时候，必须负责将申请的内存释放掉，并把无效指针设置为空。可以说，这一点是万恶之源，大量内存泄漏、悬空指针、越界访问的 bug 由此产生。 而现代的开发语言（比如 C#、Java）都带有垃圾回收机制，将开发人员从维护内存分配和清理的繁重工作中解放出来，开发者不用再担心内存泄漏的问题，但同时也被剥夺了和内存亲密接触的机会，并牺牲了一定的程序运行效率。不过好处就是提高了开发效率，并降低了 bug 发生的概率。 由于现在的垃圾回收机制已经非常成熟了，把对性能的影响降到了最低，因此大部分场景选择的都是带垃圾回收的语言。 而 Python 里面同样具有垃圾回收，只不过它是为引用计数机制服务的。所以解释器通过引用计数和垃圾回收，代替程序员进行繁重的内存管理工作，关于垃圾回收我们后面会详细说，先来看一下引用计数。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 楔子","id":"39","title":"楔子"},"4":{"body":"在学习 Python 的时候，你肯定听过这么一句话：Python 中一切皆对象。没错，在 Python 世界里，一切都是对象。整数是一个对象、字符串是一个对象、字典是一个对象，甚至 int, str, list 以及我们使用 class 关键字自定义的类，它们也是对象。 像 int, str, list 等基本类型，以及自定义的类，由于它们可以表示类型，因此我们称之为类型对象；类型对象实例化得到的对象，我们称之为实例对象。但不管是哪种对象，它们都属于对象。因此 Python 将面向对象理念贯彻的非常彻底，面向对象中的类和对象在 Python 中都是通过对象实现的。 在面向对象理论中，存在着类和对象两个概念，像 int、dict、tuple、以及使用 class 关键字自定义的类型对象实现了面向对象理论中类的概念，而 123、3.14、\"string\" 等实例对象则实现了面向对象理论中对象的概念。但在 Python 里面，面向对象中的类和对象都是通过对象实现的。 我们举个例子： # dict 是一个类，因此它属于类型对象\n# 类型对象实例化得到的对象属于实例对象\nprint(dict)\n\"\"\"\n<class 'dict'>\n\"\"\"\nprint(dict(a=1, b=2))\n\"\"\"\n{'a': 1, 'b': 2}\n\"\"\" 因此可以用一张图来描述面向对象在 Python 中的体现。 而如果想查看一个对象的类型，可以使用 type，或者通过对象的 __class__ 属性。 data = [1, 2, 3]\n# 查看类型\nprint(type(data))\n\"\"\"\n<class 'list'>\n\"\"\"\nprint(data.__class__)\n\"\"\"\n<class 'list'>\n\"\"\" 如果想判断一个对象是不是指定类型的实例对象，可以使用 isinstance。 data = [1, 2, 3]\n# 判断是不是指定类型的实例对象\nprint(isinstance(data, list))\n\"\"\"\nTrue\n\"\"\" 但是问题来了，按照面向对象的理论来说，对象是由类实例化得到的，这在 Python 中也是适用的。既然是对象，那么就必定有一个类来实例化它，换句话说对象一定要有类型。至于一个对象的类型是什么，就看这个对象是被谁实例化的，被谁实例化，那么类型就是谁，比如列表的类型是 list，字典的类型是 dict 等等。 而 Python 中一切皆对象，所以像 int, str, tuple 这些内置的类对象也是具有相应的类型的，那么它们的类型又是谁呢？使用 type 查看一下就知道了。 print(type(int)) # <class 'type'>\nprint(type(str)) # <class 'type'>\nprint(type(dict)) # <class 'type'>\nprint(type(type)) # <class 'type'> 我们看到类型对象的类型，无一例外都是 type。而 type 我们也称其为元类，表示类型对象的类型。至于 type 本身，它的类型还是 type，所以它连自己都没放过，把自己都变成自己的对象了。 因此在 Python 中，你能看到的任何对象都是有类型的，可以使用 type 查看，也可以获取该对象的 __class__ 属性查看。所以：实例对象、类型对象、元类，Python 中任何一个对象都逃不过这三种身份。 到这里可能有人会发现一个有意思的点，我们说 int 是一个类对象，这显然是没有问题的。因为站在整数（比如 123）的角度上，int 是一个不折不扣的类对象；但如果站在 type 的角度上呢？显然我们又可以将 int 理解为实例对象，因此 class 具有二象性。 至于 type 也是同理，虽然它是元类，但本质上也是一个类对象。 注：不仅 type 是元类，那些继承了 type 的类也可以叫做元类。 然后 Python 中还有一个关键的类型（对象），叫做 object，它是所有类型对象的基类。不管是什么类，内置的类也好，我们自定义的类也罢，它们都继承自 object。因此 object 是所有类型对象的基类、或者说父类。 那如果我们想获取一个类都继承了哪些基类，该怎么做呢？方式有三种： class A: pass class B: pass class C(A): pass class D(B, C): pass # 首先 D 继承自 B 和 C, C 又继承 A\n# 我们现在要来查看 D 继承的父类 # 方法一: 使用 __base__\nprint(D.__base__) \"\"\"\n<class '__main__.B'>\n\"\"\" # 方法二: 使用 __bases__\nprint(D.__bases__) \"\"\"\n(<class '__main__.B'>, <class '__main__.C'>)\n\"\"\" # 方法三: 使用 __mro__\nprint(D.__mro__)\n\"\"\"\n(<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>)\n\"\"\" __base__：如果继承了多个类，那么只显示继承的第一个类，没有显式继承则返回 <class 'object'> __bases__：返回一个元组，会显示所有直接继承的父类，没有显式继承则返回 (<class 'object'>,) __mro__: mro（Method Resolution Order）表示方法查找顺序，会从自身出发，找到最顶层的父类。因此返回自身、继承的基类、以及基类继承的基类，一直找到 object 而如果想查看某个类型是不是另一个类型的子类，可以通过 issubclass。 print(issubclass(str, object))\n\"\"\"\nTrue\n\"\"\" 因此，我们可以得出以下两个结论： type 站在类型金字塔的最顶端，任何一个对象按照类型追根溯源，最终得到的都是 type； object 站在继承金字塔的最顶端，任何一个类型对象按照继承关系追根溯源，最终得到的都是 object； 但要注意的是，我们说 type 的类型还是 type，但 object 的基类则不再是 object，而是 None。 print(type.__class__) # <class 'type'> # 注：以下打印结果容易让人产生误解\n# 它表达的含义是 object 的基类为空\n# 而不是说 object 继承 None\nprint(object.__base__) # None 但为什么 object 的基类是 None，而不是它自身呢？其实答案很简单，Python 在查找属性或方法的时候，自身如果没有的话，会按照 __mro__ 指定的顺序去基类中查找。所以继承链一定会有一个终点，否则就会像没有出口的递归一样出现死循环了。 我们用一张图将对象之间的关系总结一下： 实例对象的类型是类型对象，类型对象的类型是元类； 所有类型对象的基类都收敛于 object； 所有对象的类型都收敛于 type； 因此 Python 算是将 一切皆对象 的理念贯彻到了极致，也正因为如此，Python 才具有如此优秀的动态特性。 但是还没结束，我们再重新审视一下上面那张图，会发现里面有两个箭头看起来非常的奇怪。object 的类型是 type，type 又继承了 object。 print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 因为 type 是所有类的元类，而 object 是所有类的基类，这就说明 type 要继承自 object，而 object 的类型是 type。很多人都会对这一点感到奇怪，这难道不是一个先有鸡还是先有蛋的问题吗？答案不是的，这两个对象是共存的，它们之间的定义是互相依赖的。而具体是怎么一回事，我们后续分析。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » Python 中一切皆对象","id":"4","title":"Python 中一切皆对象"},"40":{"body":"Python 一切皆对象，所有对象都有一个 ob_refcnt 字段，该字段维护着对象的引用计数，从而也决定对象的存在与消亡。下面来探讨一下引用计数，当然引用计数在介绍 PyObject 的时候说的很详细了，这里再回顾一下。 但需要说明的是，比起类型对象，我们更关注实例对象的行为。引用计数也是如此，只有实例对象，我们探讨引用计数才是有意义的。因为内置的类型对象超越了引用计数规则，永远都不会被析构，或者销毁，因为它们在底层是被静态定义好的。同理，自定义的类虽然可以被回收，但是探讨它的引用计数也是没有价值的。我们举个栗子： class A: pass del A 首先 del 关键字只能作用于变量，不可以作用于对象。比如 e = 2.71，可以 del e，但是不可以 del 2.71，这是不符合语法规则的。因为 del 的作用是删除变量，并将其指向的对象的引用计数减 1，所以我们只能 del 变量，不可以 del 对象。 至于 def、class 语句执行完之后拿到的也是变量，前面说了，Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针。比如上面代码中的 class A，它会先创建一个类对象，然后再让变量 A 指向这个类对象。所以我们拿到的 A 也是一个变量，只要是变量，就可以被 del。但是 del 变量只是删除了该变量，换言之就是让该变量无法再被使用，至于变量指向的对象是否会被回收，就看是否还有其它的变量也指向它。 总结：对象是否会被回收，完全由解释器判断它的引用计数是否为 0 所决定。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数","id":"40","title":"引用计数"},"41":{"body":"操作引用计数无非就是将其加一或减一，至于什么时候加一、什么时候减一，在介绍 PyObject 的时候已经说的很详细了。这里我们通过源码，看看引用计数具体是怎么操作的。 在底层，解释器会通过 Py_INCREF 和 Py_DECREF 两个宏来增加和减少对象的引用计数，而当对象的引用计数为 0 时，会调用对应的析构函数来销毁该对象，这个析构函数由对象的类型对象内部的 tp_dealloc 字段决定。 下面我们来看看底层实现，不过在介绍 Py_INCREF 和 Py_DECREF 之前，先来看几个其它的宏，这些宏非常常见，有必要单独说一下。 // Include/object.h // 将对象的指针转成 PyObject *\n#define _PyObject_CAST(op) ((PyObject*)(op))\n// 将对象的指针转成 PyVarObject *\n#define _PyVarObject_CAST(op) ((PyVarObject*)(op)) // 返回对象的引用计数，即对象的 ob_refcnt 字段\n#define Py_REFCNT(ob) (_PyObject_CAST(ob)->ob_refcnt)\n// 返回对象的类型，即对象的 ob_type 字段\n#define Py_TYPE(ob) (_PyObject_CAST(ob)->ob_type)\n// 返回对象的长度，即对象的 ob_size 字段\n#define Py_SIZE(ob) (_PyVarObject_CAST(ob)->ob_size) 然后再来看看 Py_INCREF 和 Py_DECREF，它们负责对引用计数执行加一和减一操作。 // Include/object.h // 将对象的 ob_refcnt 加 1\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op))\nstatic inline void _Py_INCREF(PyObject *op)\n{ _Py_INC_REFTOTAL; op->ob_refcnt++;\n} // 将对象的 ob_refcnt 减 1\n#define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))\ntatic inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ (void)filename; /* may be unused, shut up -Wunused-parameter */ (void)lineno; /* may be unused, shut up -Wunused-parameter */ _Py_DEC_REFTOTAL; // 将引用计数减 1 之后进行判断，如果结果不等于 0，则什么也不做 if (--op->ob_refcnt != 0) { // 正常情况下，Py_REF_DEBUG 宏不会被定义，因为引用计数不可能小于 0\n#ifdef Py_REF_DEBUG if (op->ob_refcnt < 0) { _Py_NegativeRefcount(filename, lineno, op); }\n#endif } // 否则说明引用计数为 0，意味着对象已经不被任何变量引用了，那么应该被销毁 else { // 调用 _Py_Dealloc 将对象销毁，这个 _Py_Dealloc 函数内部的逻辑很简单 // 虽然里面存在宏判断，但如果只看编译后的最终结果，那么代码就只有下面两行 /* destructor dealloc = Py_TYPE(op)->tp_dealloc; * (*dealloc)(op); */ // 会获取类型对象的 tp_dealloc，然后调用，销毁实例对象 _Py_Dealloc(op); }\n} 以上就是 Py_INCREF 和 Py_DECREF 两个宏的具体实现，但是它们不能接收空指针，如果希望能接收空指针，那么可以使用另外两个宏。 // Include/object.h #define Py_XINCREF(op) _Py_XINCREF(_PyObject_CAST(op))\nstatic inline void _Py_XINCREF(PyObject *op)\n{ if (op != NULL) { Py_INCREF(op); }\n} #define Py_XDECREF(op) _Py_XDECREF(_PyObject_CAST(op))\nstatic inline void _Py_XDECREF(PyObject *op)\n{ if (op != NULL) { Py_DECREF(op); }\n} 所以 Py_XINCREF 和 Py_XDECREF 会额外对指针做一次判断，如果为空则什么也不做，不为空再调用 Py_INCREF 和 Py_DECREF。而当一个对象的引用计数为 0 时，与该对象对应的析构函数就会被调用。 但要特别注意的是，我们上面说调用析构函数之后会回收对象，或者说销毁对象，意思是将这个对象从内存中抹去，但并不意味着要释放空间，也就是对象没了，但对象占用的内存却还在。 如果对象没了，占用的内存也要释放的话，那么频繁申请、释放内存空间会使 Python 的执行效率大打折扣，更何况 Python 已经背负了人们对其执行效率的不满这么多年。 所以 Python 底层大量采用了缓存池的技术，使用这种技术可以避免频繁地申请和释放内存空间。因此在析构的时候，只是将对象占用的空间放到缓存池中，并没有真的释放。 这一点，在后面剖析内置实例对象的实现中，将会看得一清二楚，因为大部分内置的实例对象都会有自己的缓存池。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数的相关操作","id":"41","title":"引用计数的相关操作"},"42":{"body":"到此我们就把这些基础概念说完了，后续你会发现目前花费的这些笔墨都是值得的，总之先对 Python 有一个宏观的认识，然后再学习具体的数据结构就简单多了。 所以从下一篇文章开始就要详细剖析内置对象的底层实现了，比如浮点数、复数、整数、布尔值、None、bytes 对象、bytearray 对象、字符串、元组、列表、字典、集合等等，所有的内置对象都会详细地剖析一遍，看看它是如何实现的。 有了目前为止的这些基础，我们后面就会轻松很多。先把对象、变量等概念梳理清楚，然后再来搞这些数据结构的底层实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 小结","id":"42","title":"小结"},"43":{"body":"从现在开始，我们就来分析 Python 的内置对象，看看它们在底层是如何实现的。但说实话，我们在前面几篇文章中介绍对象的时候，已经说了不少了，不过从现在开始要进行更深入的分析。 除了对象本身，还要看对象支持的操作在底层是如何实现的。我们首先以浮点数为例，因为它是最简单的，没错，浮点数比整数要简单，至于为什么，等我们分析整数的时候就知道了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 楔子","id":"43","title":"楔子"},"44":{"body":"要想搞懂浮点数的实现原理，就要知道它在底层是怎么定义的，当然在这之前我们已经见过它很多遍了。 // Include/floatobject.h\ntypedef struct { PyObject_HEAD double ob_fval;\n} PyFloatObject; 它包含了一个公共头部 PyObject 和一个 double 类型的 ob_fval 字段，毫无疑问这个 ob_fval 字段负责存储浮点数的具体数值。 我们以 e = 2.71 为例，底层结构如下。 还是很简单的，每个对象在底层都是由结构体表示的，这些结构体中有的字段负责维护对象的元信息，有的字段负责维护具体的值。比如这里的 2.71，总要有一个字段来存储 2.71 这个值，而这个字段就是 ob_fval。所以浮点数的结构非常简单，直接使用一个 C 的 double 来维护。 假设我们要将两个浮点数相加，相信你已经知道解释器会如何做了。通过 PyFloat_AsDouble 将两个浮点数的 ob_fval 抽出来，然后相加，最后再根据相加的结果创建一个新的 PyFloatObject 即可。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数的底层结构","id":"44","title":"浮点数的底层结构"},"45":{"body":"下面来看看浮点数是如何创建的，在前面的文章中，我们说内置对象可以使用对应的特定类型 API 创建，也可以通过调用类型对象创建。 调用类型对象 float 创建实例对象，解释器会执行元类 type 的 tp_call，它指向了 type_call 函数。然后 type_call 内部会先调用类型对象（这里是 float）的 tp_new 为其实例对象申请一份空间，申请完毕之后对象就创建好了。然后再调用 tp_init，并将实例对象作为参数传递进去，进行初始化，也就是设置属性。 但是对于 float 来说，它内部的 tp_init 字段为 0，也就是空。 这就说明 float 没有 __init__，因为浮点数太过简单，只需要一个 tp_new 即可。我们举个例子： class Girl1: def __init__(self, name, age): self.name = name self.age = age # __new__ 负责开辟空间、生成实例对象\n# __init__ 负责给实例对象绑定属性 # 但其实 __init__ 所做的工作可以直接在 __new__ 当中完成\n# 换言之有 __new__ 就足够了，其实可以没有__init__\n# 我们将上面的例子改写一下 class Girl2: def __new__(cls, name, age): instance = object.__new__(cls) instance.name = name instance.age = age return instance g1 = Girl1(\"古明地觉\", 16)\ng2 = Girl2(\"古明地觉\", 16)\nprint(g1.__dict__ == g2.__dict__) # True 我们看到效果是等价的，因为 __init__ 负责给 self 绑定属性，而这个 self 是 __new__ 返回的。那么很明显，我们也可以在 __new__ 当中绑定属性，而不需要 __init__。 但是按照规范，属性绑定应该放在 __init__ 中执行。只是对于浮点数而言，由于其结构非常简单，所以底层就没有给 float 实现 __init___，所有操作都是在 __new__ 当中完成的。 print(float.__init__ is object.__init__) # True\nprint(tuple.__init__ is object.__init__) # True\nprint(list.__init__ is object.__init__) # False 所以 float 没有 __init__，即便获取拿到的也是 object 的 __init__，因为 object 是 float 的基类。同理 tuple 也没有，但 list 是有的。 那么下面就来看一下 PyFloat_Type 的 tp_new，看它是如何创建浮点数的。通过 PyFloat_Type 的定义我们可以看到，在创建的时候给 tp_new 字段设置的是 float_new，那么一切秘密就隐藏在 float_new 里面。 // Objects/clinic/floatobject.c.h\nstatic PyObject *\nfloat_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)\n{ PyObject *return_value = NULL; PyObject *x = _PyLong_Zero; // float 不接收关键字参数，如果传递了，那么报错 if ((type == &PyFloat_Type) && !_PyArg_NoKeywords(\"float\", kwargs)) { goto exit; } // float 只接收 0 到 1 个位置参数，如果不满足，那么报错 if (!_PyArg_CheckPositional(\"float\", PyTuple_GET_SIZE(args), 0, 1)) { goto exit; } // 如果参数个数为 0，说明调用 float 时没传参数，那么直接跳转到 skip_optional 标签 // 由于变量 x 的值初始为 _PyLong_Zero，所以在 Python 中，float() 和 float(0) 是等价的 if (PyTuple_GET_SIZE(args) < 1) { goto skip_optional; } // 否则说明传递了一个参数，那么获取该参数 x = PyTuple_GET_ITEM(args, 0);\nskip_optional: // 调用 float_new_impl，拿到返回值 // 所以核心实现位于 float_new_impl 函数中 return_value = float_new_impl(type, x); exit: return return_value;\n} // Objects/floatobject.c\nstatic PyObject *\nfloat_new_impl(PyTypeObject *type, PyObject *x)\n{ // 如果 type 不是 &PyFloat_Type，那么必须是它的子类，否则调用 float_subtype_new 会报错 // 但该条件很少触发，因为创建的是浮点数，所以 type 自然是 &PyFloat_Type if (type != &PyFloat_Type) return float_subtype_new(type, x); // 然后检测 x 的类型，如果它是一个字符串，那么就根据字符串创建浮点数，比如 float(\"3.14\") if (PyUnicode_CheckExact(x)) return PyFloat_FromString(x); // 不是字符串，则调用 PyNumber_Float return PyNumber_Float(x);\n} 再来看看 PyNumber_Float。 // Objects/abstract.c\nPyObject *\nPyNumber_Float(PyObject *o)\n{ PyNumberMethods *m; // 如果传递的是 NULL，直接返回错误 if (o == NULL) { return null_error(); } // 如果传递的本身就是个浮点数，那么增加引用计数，直接返回 if (PyFloat_CheckExact(o)) { Py_INCREF(o); return o; } // 走到这里说明对象不是浮点数，那么它必须要能转成浮点数 // 也就是类型对象的内部要有 __float__ 这个魔法函数，即 nb_float // 获取方法簇 m = o->ob_type->tp_as_number; // 如果方法簇不为空，并且也实现了 nb_float if (m && m->nb_float) { // 那么获取 nb_float 指向的函数并调用，将对像转成浮点数 PyObject *res = m->nb_float(o); double val; // 如果 res 不为 NULL，并且是浮点数，那么返回 // PyFloat_CheckExact 负责检测一个对象的类型是否是 <class 'float'> // 其逻辑等价于 type(res) is float if (!res || PyFloat_CheckExact(res)) { return res; } // 走到这里说明 __float__ 返回的对象不是浮点数，即对象的类型不是 float // 如果不是 float，那么 float 的子类目前也是可以的（会抛警告） // PyFloat_Check 负责检测对象的类型是否是 float 或者其子类 // 其逻辑等价于 isinstance(res, float) if (!PyFloat_Check(res)) { // 如果返回的对象的类型不是 float 或者其子类，那么报错 PyErr_Format(PyExc_TypeError, \"%.50s.__float__ returned non-float (type %.50s)\", o->ob_type->tp_name, res->ob_type->tp_name); Py_DECREF(res); return NULL; } // 到这里说明返回的对象的类型是 float 的子类，此时也是合法的，但会抛出警告 if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, \"%.50s.__float__ returned non-float (type %.50s). \" \"The ability to return an instance of a strict subclass of float \" \"is deprecated, and may be removed in a future version of Python.\", o->ob_type->tp_name, res->ob_type->tp_name)) { Py_DECREF(res); return NULL; } // res 虽然是 float 子类的实例对象，但依旧具备浮点数的特征，因此将内部的数值抽出来 val = PyFloat_AS_DOUBLE(res); // 减少 res 指向对象的引用计数 Py_DECREF(res); // 创建 PyFloatObject 实例，并返回它的泛型指针 // 因此即使 __float__ 返回的是 float 子类的实例对象，也会默认转成 float 对象（浮点数）返回 return PyFloat_FromDouble(val); } // 如果 float 接收的参数没有实现 nb_float（__float__），那么会去找 nb_index（__index__） if (m && m->nb_index) { // 内部会调用对象的 nb_index PyObject *res = PyNumber_Index(o); if (!res) { return NULL; } // __index__ 返回的必须是整数 // 所以调用的是 PyLong_AsDouble，表示基于 Python 整数创建 C 浮点数 double val = PyLong_AsDouble(res); Py_DECREF(res); if (val == -1.0 && PyErr_Occurred()) { return NULL; } // 通过 C 浮点数创建 Python 浮点数 return PyFloat_FromDouble(val); } // 到这里说明对象没有实现 __float__ 和 __index__ // 那么检测传递的对象的类型是不是 float 的子类 // 如果是，证明它的结构和浮点数是一致的 // 直接根据 ob_fval 构建 PyFloatObject if (PyFloat_Check(o)) { return PyFloat_FromDouble(PyFloat_AS_DOUBLE(o)); } // 如果以上条件都不满足，说明它有可能是字节串、字节数组、字符串（但类型是 str 的子类）等等 // 那么直接交给 PyFloat_FromString return PyFloat_FromString(o);\n} 所以一个 float 调用居然要走这么多逻辑，总之解释器为我们考虑了很多。我们用 Python 来演绎一下： # 2.71 是一个字符串，所以在 float_new_impl 里面直接调用 PyFloat_FromString\nprint(float(\"2.71\")) # 2.71 class E: def __float__(self): return 2.71 # 传递的参数是一个 E 类型，所以会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_float，所以会直接调用\nprint(float(E())) # 2.71 class N: def __index__(self): return 3 # N 不是字符串类型，显然也会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_index，所以会直接调用\nprint(float(N())) # 3.0 class PI: class Float(float): pass def __float__(self): return self.Float(3.14) # 显然会调用内部的 __float__，但 __float__ 返回的不是 float 实例，而是 float 子类的实例\n# 虽然这种做法是允许的，但会抛出警告，警告的内容就是源码中描述的那样\n# DeprecationWarning: PI.__float__ returned non-float (type Float).\nprint(float(PI())) # 3.14 # 参数不是字符串，也没有实现 __float__ 和 __index__，那么直接执行 PyFloat_FromString\nprint(float(b\"1.414\")) # 1.414 以上是通过类型对象创建，但在底层实际上也是调用了对象的特定类型 APl。 PyObject *\nPyFloat_FromDouble(double); PyObject *\nPyFloat_FromString(PyObject *); PyFloat_FromDouble：基于 C 浮点数创建 Python 浮点数； PyFloat_FromString：基于字符串创建 Python 浮点数； 如果以 e = 2.71 这种方式创建，那么解释器在编译的时候就知道这是一个浮点数，因此会一步到胃，直接调用 PyFloat_FromDouble，然后在该函数内部会根据 C 的浮点数 2.71 创建对应的 PyFloatObject。而通过类型对象调用的话则会有一些额外的开销，因为这种方式最终也会调用相关的特定类型 API，但是在调用之前会干一些别的事情，比如类型检测等等。 所以 e = 2.71 比 float(2.71)、float(\"2.71\") 都要高效。 因此对于内置对象来说，可以调用它的类型对象去创建，这是最通用的逻辑。但这种做法会先兜个圈子，然后再去使用对象的特定类型 API，肯定没有直接使用特定类型 API 的效率高，也就是说 e = 2.71 这种方式是最快的，底层会直接调用 PyFloat_FromDouble。 对于其它对象也是同理，当然大部分情况下我们也都是使用特定类型 API 来创建的。以列表为例，比起 list()，我们更习惯使用［］。 还没结束，浮点数的实际创建过程我们还没有见到，因为最终还是调用特定类型 API 创建的。那么接下来就以 PyFloat_FromDouble 函数为例，看看浮点数在底层的创建过程。 // Objects/floatobject.c // 缓存池（链表）的最大长度，也就是缓存池最多能容纳多少个元素\n#define PyFloat_MAXFREELIST 100\n// 缓存池已经容纳了多少个元素，最多不能超过 PyFloat_MAXFREELIST\nstatic int numfree = 0;\n// 指向缓存池（链表）的头结点，因为缓存池是一个由 PyFloatObject 实例组成的链表\nstatic PyFloatObject *free_list = NULL;\n// 介绍引用计数时说过，引用计数如果为 0，那么对象会被销毁\n// 但是对象所占的内存则不一定释放，而是会缓存起来，浮点数也是如此\n// 销毁浮点数时，会将其放入缓存池中，创建浮点数时，也会优先从缓存池里面获取\n// 而缓存池是使用链表实现的，每一个节点都是一个 PyFloatObject 实例，然后 free_list 指向链表的头节点 PyObject *\nPyFloat_FromDouble(double fval)\n{ // 如果 op 不为 NULL，说明缓存池中有可用对象 PyFloatObject *op = free_list; if (op != NULL) { // 而一旦获取了，那么要维护 free_list，让它指向下一个节点 // 但问题来了，为啥获取下一个节点要通过 Py_TYPE，它不是负责返回 ob_type 吗？ // 相信你已经猜到原因了，因为 ob_type 充当了链表中的 next 指针 // 关于这里的细节，后续介绍缓存池的时候会详细说 free_list = (PyFloatObject *) Py_TYPE(op); // 然后还要将缓存池（链表）的节点个数减 1 numfree--; } else { // 否则说明缓存池里面没有空闲的可用对象，那么要重新申请内存 // PyObject_MALLOC 是基于 malloc 的一个封装，但对内存碎片做了优化 op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } // 走到这里说明内存分配好了，PyFloatObject 也创建了 // 但是不是还少了点啥呢？没错，显然内部的字段还没有初始化 // 还是那句话，内置类型的实例对象该分配多少空间，解释器了如指掌 // 因为通过 PyFloatObject 内部的字段一算就出来了 // 所以虽然对象创建了，但是 ob_refcnt、ob_type、以及 ob_fval 三个字段还没有初始化 // 因此还要将其 ob_refcnt 设置为 1，因为新创建的对象的引用计数是 1 // 以及将 ob_type 设置为指向 PyFloat_Type 的指针，因为它的类型是 float // 而 PyObject_INIT 专们用来设置 ob_refcnt 以及 ob_type，它的源码解释在下面 (void)PyObject_INIT(op, &PyFloat_Type); // 将内部的 ob_fval 字段设置为参数 fval，此时三个字段都已经初始化完毕 op->ob_fval = fval; // 变量是泛型指针 PyObject *，所以还要转成 PyObject * 之后才能返回 return (PyObject *) op;\n} // 补充：PyObject_INIT 的定义如下\n// Include/objimpl.h\n#define PyObject_INIT(op, typeobj) \\ _PyObject_INIT(_PyObject_CAST(op), (typeobj)) static inline PyObject*\n_PyObject_INIT(PyObject *op, PyTypeObject *typeobj)\n{ assert(op != NULL); // 设置实例对象的 ob_type Py_TYPE(op) = typeobj; // 如果 typeobj 是自定义的动态类，那么还要将类型对象的引用计数加 1 // 因为实例对象创建了，意味着类型对象会多一个引用 // 当然这只是针对于动态类，如果 typeobj 是内置的静态类型，那么不做处理 // 因为内置类型超越了引用计数规则，永远不会被析构 if (PyType_GetFlags(typeobj) & Py_TPFLAGS_HEAPTYPE) { Py_INCREF(typeobj); } // 将实例对象的引用计数初始化为 1 _Py_NewReference(op); return op;\n} // Objects/floatobject.c\nvoid\n_Py_NewReference(PyObject *op)\n{ if (_Py_tracemalloc_config.tracing) { _PyTraceMalloc_NewReference(op); } _Py_INC_REFTOTAL; // 初始化为 1 op->ob_refcnt = 1; _Py_AddToAllObjects(op, 1); _Py_INC_TPALLOCS(op);\n} 所以整体流程如下： 为实例对象分配内存空间，空间分配完了对象也就创建了，不过会优先使用缓存池； 初始化实例对象内部的引用计数和类型指针； 初始化 ob_fval 字段为参数 fval； 另外这里又体现了之前说的一个现象，对于自定义的类而言，想要创建实例对象必须要借助于类型对象。但使用特定类型 API 创建浮点数，却压根不需要类型对象 float，而是直接就创建了。创建完之后再让其 ob_type 字段指向 float，将类型和实例关联起来即可。 而之所以能这么做的根本原因就在于，内置类型的实例对象在底层都是静态定义好的，字段已经写死了，所以创建的时候不需要类型对象。解释器知道创建这样的对象需要分配多少内存，所以会直接创建，创建完之后再对内部字段进行初始化，比如设置引用计数和类型。 但对于我们自定义的类而言，想要创建实例对象就必须要借助于类型对象了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么创建的","id":"45","title":"浮点数是怎么创建的"},"46":{"body":"当删除一个变量时，解释器会通过函数 Py_DECREF 来减少该变量指向的对象的引用计数，并判断引用计数减一之后是否为 0，如果为 0 则调用其类型对象的 tp_dealloc 回收该对象。 // Include/object.h\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op)) static inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ // ... if (--op->ob_refcnt != 0) { // ... } else { _Py_Dealloc(op); }\n} // Objects/object.c\nvoid\n_Py_Dealloc(PyObject *op)\n{ destructor dealloc = Py_TYPE(op)->tp_dealloc; // 函数里面有个宏判断，编译展开之后就是下面这一行 (*dealloc)(op);\n} 所以当浮点数被销毁时，会调用 PyFloat_Type 的 tp_dealloc，这是显然的。而 PyFloat_Type 的 tp_dealloc 被初始化为 float_dealloc。 在 float_dealloc 函数内部我们会清晰地看到一个浮点数被销毁的全部过程，关于它的源代码，我们会在介绍缓存池的时候细说。总之到这里我们已经知道了浮点数被销毁的整个流程，下面来画张图描述一下。 以上就是浮点数对象被销毁的流程图，整个过程很简单。 在将对象的引用计数减 1 之后会判断是否为 0，如果为 0，则调用 _Py_Dealloc 销毁对象。而在 _Py_Dealloc 内部会获取对象的类型对象，然后拿到类型对象的 tp_dealloc 字段指向的函数。对于浮点数来说，这个函数就是 float_dealloc。 然后执行 float_dealloc(obj) 将对象销毁，但占用的空间会被缓存起来（取决于是否有缓存池以及缓存池的容量）。 所以整个流程理解起来没有任何难度，里面唯一没有说的就是 float_dealloc，即浮点数的具体销毁过程，这个等介绍缓存池的时候再一起说。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么销毁的","id":"46","title":"浮点数是怎么销毁的"},"47":{"body":"以上就是浮点数在底层的创建和销毁过程，下一篇文章来聊一聊浮点数的缓存池。当一些占用内存较小的对象在被销毁时，不会释放所占的内存，而是缓存起来。等下一次再使用的时候，直接从缓存池中获取，从而避免了频繁申请内存。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 小结","id":"47","title":"小结"},"48":{"body":"浮点数这种对象经常容易被创建和销毁，因为它很简单，使用频率高。如果每次创建都借助操作系统分配内存、每次销毁都借助操作系统回收内存的话，那效率会低到什么程度，可想而知。 因此 Python 解释器在操作系统之上封装了一个内存池，在内存管理的时候会详细介绍，目前可以认为内存池就是解释器预先向操作系统申请的一部分内存，专门用于小对象的快速创建和销毁，从而避免了频繁和操作系统打交道，这便是 Python 的内存池机制。 但浮点数的使用频率很高，并且使用时还会创建和销毁大量的临时对象，举个例子: a = 95.5\nb = 117.3\nc = 108.9 avg = (a + b + c) / 3 计算平均值的时候，会先计算 a + b，创建一个临时对象。接着让临时对象和 c 相加再创建一个临时对象，然后除以 3得到结果。最后销毁临时对象，并将结果交给变量 avg。 尽管我们平常很少注意到这些，但运算背后所产生的对象的创建和销毁的次数，比我们想象的要多。特别是在循环的时候，会伴随大量的对象创建和销毁操作， 如果每次创建和销毁对象都要伴随着内存操作，这个时候即便有内存池机制，效率也是不高的，因为使用内存池虽然可以不经过操作系统，但它也会增加解释器系统的开销。 因此解释器在浮点数对象被销毁后，并不急着回收对象所占用的内存，换句话说其实对象还在，只是将该对象放入一个空闲的链表中。之前我们说对象可以理解为一片内存空间，对象如果被销毁，那么理论上内存空间要归还给操作系统，或者回到内存池中。但 Python 考虑到效率，并没有真正地释放内存，而是将对象放入到链表中，占用的内存还在。 后续如果需要创建新的浮点数对象时，那么从链表中直接取出之前放入的对象（我们认为被回收的对象），然后根据新的浮点数对象重新初始化对应的字段即可，这样就避免了内存分配造成的开销。而这个链表就是我们说的缓存池，当然不光浮点数对象有缓存池，Python 的很多其它对象也有对应的缓存池，比如列表。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 楔子","id":"48","title":"楔子"},"49":{"body":"下面看一下浮点数的缓存池的具体细节。 // Objects/floatobject.c // 缓存池（链表）的最大长度\n// 因此池子里面最多容纳 100 个 PyFloatobject\n#define PyFloat_MAXFREELIST 100 // 缓存池已经容纳了多少个 PyFloatobject\nstatic int numfree = 0;\n// 指向缓存池（链表）的头节点\nstatic PyFloatObject *free_list = NULL; 我们观察一下 free_list，发现它是一个 PyFloatObect *，这就说明缓存池（链表）中的每一个节点都是 PyFloatObject 实例。但以我们刷 Leetcode 的经验，链表里的每个节点应该有一个 next 字段指向下一个节点，可 PyFloatObject 里面似乎并没有这样的字段啊。 相信你已经猜到原因了，因为解释器是使用 ob_type 字段来指向下一个对象。本来 ob_type 指向的应该是 PyFloat_Type，但在缓存池中指向的是下一个 PyFloatObject。 以上就是浮点数的缓存池，说白了就是一个链表，free_list 指向链表的头节点，节点之间通过 ob_type 字段充当 next 指针。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 缓存池的实现细节","id":"49","title":"缓存池的实现细节"},"5":{"body":"Python 的变量只是一个名字，如果站在 C 语言的角度来看，那么就是一个指针。所以 Python 的变量保存的其实是对象的内存地址，或者说指针，而指针指向的内存存储的才是对象。 所以在 Python 中，我们都说变量指向了某个对象。在其它静态语言中，变量相当于是为某块内存起的别名，获取变量等于获取这块内存所存储的值。而 Python 中变量代表的内存所存储的不是对象，而是对象的指针（或者说引用）。 我们举例说明，看一段 C 代码。 #include <stdio.h> void main()\n{ int a = 666; printf(\"address of a = %p\\n\", &a); a = 667; printf(\"address of a = %p\\n\", &a);\n} 编译执行一下： 赋值前后地址都是 0x7fff9eda521c，没有变化，再来看一段 Python 代码。 a = 666\nprint(hex(id(a))) # 0x7febf803a3d0 a = 667\nprint(hex(id(a))) # 0x7fec180677b0 我们看到 Python 里面输出的地址发生了变化，下面分析一下原因。 首先在 C 中，创建一个变量的时候必须规定好类型，比如 int a = 666，那么变量 a 就是 int 类型，以后在所处的作用域中就不可以变了。如果这时候再设置 a = 777，那么等于是把内存中存储的 666 换成 777，a 的地址和类型是不会变化的。 而在 Python 中，a = 666 等于是先开辟一块内存，存储的值为 666，然后让变量 a 指向这片内存，或者说让变量 a 保存这块内存的地址。然后 a = 777 的时候，再开辟一块内存，然后让 a 指向存储 777 的内存，由于是两块不同的内存，所以它们的地址是不一样的。 所以 Python 的变量只是一个和对象关联的名字，它代表的是对象的指针。换句话说 Python 的变量就是个便利贴，可以贴在任何对象上，一旦贴上去了，就代表这个对象被引用了。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量其实是指针","id":"5","title":"变量其实是指针"},"50":{"body":"我们以 PyFloat_FromDouble 这个 API 为例，再回顾一下浮点数的创建, // Objects/floatobject.c PyObject *\nPyFloat_FromDouble(double fval)\n{ // 获取缓存池的头结点指针 PyFloatObject *op = free_list; // 如果 op 不为 NULL，说明它指向了 PyFloatObject // 换句话说就是，缓存池里面有可用节点 if (op != NULL) { // 维护 free_list，让它指向链表的下一个节点 free_list = (PyFloatObject *) Py_TYPE(op); // 缓存池的节点个数减 1 numfree--; } else { op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } (void)PyObject_INIT(op, &PyFloat_Type); op->ob_fval = fval; return (PyObject *) op;\n} 在链表中，ob_type 被用于指向下一个节点，换言之 ob_type 保存的是下一个 PyFloatObject 的地址。不过话虽如此，可 ob_type 的类型仍是 PyTypeObject *。因此在存储的时候，PyFloatObject * 一定是先转成了 PyTypeObject *，之后再交给 ob_type 保存。因为对于指针来说，是可以任意转化的，我们一会儿看 float_dealloc 的时候就知道了。 那么同理，这里的 Py_TYPE(op) 在获取下一个节点的指针之后，还要再转成 PyFloatObject *，然后才能交给 free_list 保存。如果没有下一个对象了，那么 free_list 就是 NULL，在下一次分配的时候，上面的 if (op!=NULL) 就会不成立，从而走下面的 else，使用 PyObject_MALLOC 重新分配内存。 既然对象创建时可以从缓存池获取，那么销毁的时候，肯定要放入到缓存池中。而销毁对象时，会调用类型对象的 tp_dealloc（析构函数），对于浮点数而言就是 float_dealloc，我们看一下源代码。 static void\nfloat_dealloc(PyFloatObject *op)\n{ // 如果要放入浮点数的缓存池，那么它必须是浮点数 if (PyFloat_CheckExact(op)) { // 如果缓存池中的节点个数已经达到了 PyFloat_MAXFREELIST，那么直接释放掉 if (numfree >= PyFloat_MAXFREELIST) { PyObject_FREE(op); return; } // 否则放入到缓存池中 // 缓存池的节点个数加 1 numfree++; // 因为对象要成为链表的新头结点，那么它的 ob_type（充当 next）要指向当前头结点 // 所以将 ob_type 的值设置为 state->free_list 即可 // 但 ob_type 字段的类型为 PyTypeObject *，而 free_list 是 PyFloatobject * // 因此赋值之后，要将类型转换一下 Py_TYPE(op) = (struct _typeobject *)free_list; // 然后将 op 赋值为 state->free_list，也就是让 free_list 指向新的头结点 free_list = op; } // 如果销毁的对象不是浮点数，而是 float 子类的实例，那么直接释放内存 else Py_TYPE(op)->tp_free((PyObject *)op);\n} 以上便是浮点数缓存池的具体实现，说白了缓存池的作用只有一个，就是在对象被销毁的时候不释放所占的内存，下次创建新的对象时能够直接拿来用。因为内存没有被释放，因此创建起来就会快很多。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 再探浮点数的创建与销毁","id":"50","title":"再探浮点数的创建与销毁"},"51":{"body":"下面我们修改解释器源代码，当创建和销毁浮点数的时候，打印一些日志信息。 日志信息以字典的形式打印，里面有三个 key，含义如下： action：如果值为 \"from_freelist\"，表示从缓存池获取对象；如果值为 \"to_freelist\" 表示对象放入缓存池。 numfree：从缓存池获取对象、或将对象放入缓存池之后的元素个数。 address of object：创建或销毁的对象的地址。 当创建 f1 的时候，指向的浮点数会从缓存池中获取，日志信息中的对象地址显然和 Python 里打印的地址是一样的。然后 del f1，会将对象放入缓存池中。最后新建一个变量 f2，显然它指向的浮点数会复用 f1 指向的浮点数的内存。 再举个例子： 我们重新创建变量 f1、f2，并打印对象地址，然后删除 f1、f2 变量，之后再重新创建 f1、f2 变量并打印对象地址，结果发现地址在删除前后正好是相反的。至于原因，如果思考一下将对象放入缓存池、以及从缓存池获取对象时所采取的策略，那么很容易就明白了。 因为 del f1,f2 的时候会先删除 f1，再删除 f2。删除 f1 的时候，会将 f1 指向的对象作为链表中的头结点，然后删除 f2 的时候，会将 f2 指向的对象作为链表中新的头结点，所以之前 f1 指向的对象就变成了链表中的第二个节点。 浮点数缓存池在添加节点的时候，采用的是头插法。 而获取的时候，也会从链表的头部开始获取，所以当重新创建变量 f1 的时候，其指向的对象使用的是之前变量 f2 指向的对象所占的内存，而一旦获取，那么 free_list 指针会指向下一个节点。然后创建变量 f2 的时候，其指向的对象使用的就是之前变量 f1 指向的对象所占的内存。 因此前后打印的地址是相反的，所以我们算是通过实践从另一个角度印证了之前分析的结论。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 侵入 PyFloatObject","id":"51","title":"侵入 PyFloatObject"},"52":{"body":"有时我们想观察底层数据结构的表现行为时，不一定非要修改解释器，因为那样太麻烦，还要重新编译。Python 在上层提供了一种方式，可以让我们通过 Python 的类轻松地模拟 C 的结构体。 from ctypes import * class PyObject(Structure): \"\"\" 继承 ctypes.structure，便可以得到c的结构体 然后通过 fields 指定结构体字段 \"\"\" # _fields_ 是一个列表，内部的元组对应结构体的字段 _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] # ob_refcnt 是 Py_ssize_t 类型，等价于 c_ssize_t # 至于 ob_type，我们就指定 void *，因为暂时不用这个字段 class PyFloatObject(PyObject): \"\"\" 继承 Pyobject，相当于结构体的嵌套 \"\"\" _fields_ = [ (\"ob_fval\", c_double) ] e = 2.71\n# 创建 PyFloatObject 实例，返回它的指针\n# from_address 表示根据对象的地址创建\nf = PyFloatObject.from_address(id(e))\n# 此时 e 和 f 都指向了 2.71 这个浮点数 # 注意接下来会发生神奇的一幕\nprint(e) # 2.71\nprint(hex(id(e))) # 0x1f94d2382f0 # f 等价于底层的 PyFloatObject *，修改 ob_fval 字段\nf.ob_fval = 3.14\nprint(e) # 3.14\nprint(hex(id(e))) # 0x1f94d2382f0 我们看到 id(e) 在前后并没有发生改变，证明 e 指向的始终是同一个对象，但是它的值却变了。咦，不是说浮点数是不可变对象吗？如果想变的话只能创建一个新的浮点数，这样一来前后打印的地址应该会变才对啊。 首先说明结论是没错的，可这是从 Python 的角度而言。如果是从解释器的角度来看的话，没有什么可变不可变，只要我们想让它可变，那么它就是可变的。 另外为了更好地观察底层数据结构的表现，我们后面会经常使用这种方式，而且会介绍更多的骚操作，但是切记这种动态修改解释器的做法不可用于生产环境。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 通过 ctypes 模拟底层数据结构","id":"52","title":"通过 ctypes 模拟底层数据结构"},"53":{"body":"以上就是浮点数的缓存池机制，简单来说是一种空间换时间的做法。 为了避免频繁地和内核打交道，CPython 引入了内存池机制，事先会向操作系统申请一部分内存，然后根据大小划分成不同的单元，按需分配。这样就无需频繁和操作系统的内核打交道了，因为系统调用是代价昂贵的操作。 但有了内存池还不够，我们知道 Python 对象是分配在堆上的，而在堆上分配内存效率要比栈差很多。所以又引入了缓存池，对象在被销毁后不释放所占内存，而是通过一个链表串起来，留着下次备用。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 小结","id":"53","title":"小结"},"54":{"body":"本篇文章来聊一聊浮点数支持的操作，之前说过实例对象的相关操作都定义在类型对象里面，所以我们需要查看 PyFloat_Type。 // Objects/floatobject.c\nPyTypeObject PyFloat_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"float\", sizeof(PyFloatObject), // 浮点数的 __repr__ 方法 (reprfunc)float_repr, /* tp_repr */ // 浮点数作为数值对象拥有的算数操作 &float_as_number, /* tp_as_number */ // ... // 浮点数的哈希操作 (hashfunc)float_hash, /* tp_hash */ // ... // 浮点数支持的比较操作 float_richcompare, /* tp_richcompare */ // ...\n}; 还是之前说的，Python 底层的函数命名以及 API 都是很有规律的，举个例子： tp_repr 字段表示实例对象的字符串格式化，在 PyFloat_Type 里面它被赋值为 float_repr。 tp_hash 字段表示实例对象的哈希操作，在 PyFloat_Type 里面它被赋值为 float_hash。 tp_richcompare 字段表示实例对象的比较操作，所有的比较运算均由该字段负责实现，在 PyFloat_Type 里面它被赋值为 float_richcompare。 下面我们来通过源码看一下底层实现。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 楔子","id":"54","title":"楔子"},"55":{"body":"由于 PyFloat_Type 没有实现 tp_str（字段的值为 0 ），所以打印一个浮点数会执行 tp_repr，它对应的具体实现为 float_repr 函数。 // Objects/floatobject.c static PyObject *\nfloat_repr(PyFloatObject *v)\n{ PyObject *result; // 返回值 char *buf; // 将 Python 浮点数转成 C 的浮点数，然后再转成字符串 buf = PyOS_double_to_string(PyFloat_AS_DOUBLE(v), 'r', 0, Py_DTSF_ADD_DOT_0, NULL); if (!buf) return PyErr_NoMemory(); // 基于 C 字符串创建 Python 字符串 result = _PyUnicode_FromASCII(buf, strlen(buf)); // 释放 buf，然后返回 PyMem_Free(buf); return result;\n} 比较简单，当然具体的转换逻辑由 PyOS_double_to_string 函数负责，内部最终会调用 C 的库函数，感兴趣可以看一下。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的字符串打印","id":"55","title":"浮点数的字符串打印"},"56":{"body":"获取浮点数的哈希值会执行 tp_hash，它对应的具体实现为 float_hash。 // Objects/floatobject.c\nstatic Py_hash_t\nfloat_hash(PyFloatObject *v)\n{ return _Py_HashDouble(v->ob_fval);\n} 具体的哈希计算逻辑由 _Py_HashDouble 负责，通过 v->ob_fval 拿到 C 浮点数，然后传进去计算哈希值。 感兴趣可以看一下具体的哈希值计算逻辑，该函数位于 Python/pyhash.c 中。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的哈希值","id":"56","title":"浮点数的哈希值"},"57":{"body":"浮点数之间的比较操作由 tp_richcompare 字段负责实现，该字段的值为 float_richcompare。 // Include/object.h\n#define Py_LT 0 // 小于\n#define Py_LE 1 // 小于等于\n#define Py_EQ 2 // 等于\n#define Py_NE 3 // 不等于\n#define Py_GT 4 // 大于\n#define Py_GE 5 // 大于等于 // Objects/floatobject.c\nstatic PyObject*\nfloat_richcompare(PyObject *v, PyObject *w, int op)\n{ // 假设在 Python 里面执行了 3.14 == 2.71 // 那么这里的 v 和 w 就会指向 3.14 和 2.71，而 op 就是 Py_EQ double i, j; int r = 0; assert(PyFloat_Check(v)); // 通过 ((PyFloatObject *) v)->ob_fval 拿到具体的 C 浮点数 i = PyFloat_AS_DOUBLE(v); // 变量只是泛型指针 PyObject *，它究竟指向什么类型的对象是需要判断的 // 对于 v == w 来讲，如果能执行该函数，我们只能确保 v 一定指向浮点数，但 w 则不一定 // 所以需要判断，如果 w 的类型是 float 或者 float 的子类，那么转成 C double 并赋值给 j if (PyFloat_Check(w)) // 绝大部分情况都会触发此分支 j = PyFloat_AS_DOUBLE(w); else if (!Py_IS_FINITE(i)) { // ... } else if (PyLong_Check(w)) { // ... } else /* w isn't float or int */ goto Unimplemented; Compare: PyFPE_START_PROTECT(\"richcompare\", return NULL) // 拿到 i 和 j 之后，判断 op 是哪一种操作符，然后执行相应的比较逻辑 switch (op) { case Py_EQ: r = i == j; break; case Py_NE: r = i != j; break; case Py_LE: r = i <= j; break; case Py_GE: r = i >= j; break; case Py_LT: r = i < j; break; case Py_GT: r = i > j; break; } PyFPE_END_PROTECT(r) return PyBool_FromLong(r); Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 该函数的代码量还是有一些大的，但逻辑很好理解，主要是会对 w 做一些类型上的检测。因为 w 不一定是浮点数，比如 3.14 != [] 同样会触发该函数，但函数里的 w 指向的就不是浮点数，而是列表。 不过大部分情况下，两个对象比较的时候，如果符号左侧是浮点数，那么右侧基本也是浮点数。所以基本上都会走开始的 if 分支，然后进入比较逻辑。但如果符号右侧不是浮点数，那么会执行剩下的分支，逻辑会更复杂一些。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的比较操作","id":"57","title":"浮点数的比较操作"},"58":{"body":"最后是重头戏，来看看浮点数是如何运算的。由于加减乘除等算术操作很常见，所以解释器将其抽象成 PyNumberMethods 方法簇。对于数值型对象来说，它的类型对象会实现此方法簇，并由 tp_as_number 字段指向。 // Include/cpython/object.h\ntypedef struct { binaryfunc nb_add; binaryfunc nb_subtract; binaryfunc nb_multiply; binaryfunc nb_remainder; binaryfunc nb_divmod; ternaryfunc nb_power; unaryfunc nb_negative; unaryfunc nb_positive; unaryfunc nb_absolute; inquiry nb_bool; unaryfunc nb_invert; binaryfunc nb_lshift; binaryfunc nb_rshift; binaryfunc nb_and; binaryfunc nb_xor; binaryfunc nb_or; // ...\n} PyNumberMethods; PyNumberMethods 这个结构体在前面已经介绍过，每个字段都是一个函数指针，对应一个算术操作。而根据参数个数的不同，这些函数可以分为多种。 unaryfunc： 一元函数，只接收一个参数，返回 PyObject *； binaryfunc： 二元函数，接收两个参数，返回 PyObject *； ternaryfunc： 三元函数，接收三个参数，返回 PyObject *； inquiry：一元函数，接收一个参数，但返回的是 int。 它们本质上就是解释器基于参数的类型和个数而起的别名，除了以上这些，还有很多其它的别名，具体可以查看 Include/object.h。 由于浮点数是数值型对象，所以 PyFloat_Type 实现了该方法簇，值为 float_as_number，来看一下，它位于 Objects/floatobject.c 中。 像 float_add 负责浮点数的加法运算，float_sub 负责浮点数的减法运算，都比较简单。但我们看到有的函数指针被赋值成了 0，如果为 0 则表示不支持相应操作，比如浮点数不支持位运算。 在 C 语言中，给指针类型的字段赋值为 0 和赋值为 NULL 是等价的。 好，下面我们以加法运算为例，看一下具体实现。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ // 显然两个 Python 浮点数相加，一定是先转成 C 的浮点数，然后再相加 // 加完之后再根据结果创建新的 Python 浮点数 double a,b; // 声明两个 double 变量 // CONVERT_TO_DOUBLE 是一个宏，从名字上也能看出来它的作用 // 将 PyFloatObject 里面的 ob_fval 抽出来，赋值给 double 变量 CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) // 将 a 和 b 相加，然后再重新赋值给 a a = a + b; PyFPE_END_PROTECT(a) // 根据相加后的结果创建新的 PyFloatObject 对象 // 并将其指针转成 PyObject * 之后返回 return PyFloat_FromDouble(a);\n} 以上就是浮点数的加法运算，核心如下： 定义两个 double 变量 a 和 b。 将相加的两个 Python 浮点数维护的值（ob_fval）抽出来，交给 a 和 b。 让 a 和 b 相加，将相加的结果传入 PyFloat_FromDouble 函数中创建新的 PyFloatObject，然后返回其 PyObject *。 另外 float_add 里面还有两个宏我们没有说，分别是：PyFPE_START_PROTECT 和 PyFPE_END_PROTECT，它们是做什么的呢？首先浮点数计算一般都遵循 IEEE-754 标准，如果计算时出现了错误，那么需要将 IEEE-754 异常转换成 Python 异常，而这两个宏就是用来干这件事情的。 所以我们不需要管它，这两个宏定义在 Include/pyfpe.h 中，并且已经在 Python3.9 的时候被移除了。 以上便是浮点数的加法运算，所谓的浮点数在底层就是一个 PyFloatObject 结构体实例。而结构体实例无法直接相加，所以必须先将结构体中维护的值抽出来，对于浮点数而言就是 ob_fval，然后转成 C 的 double 再进行相加。最后根据相加的结果创建新的结构体实例，于是新的 Python 对象便诞生了。 假设 a, b = 1.1, 2.2，那么 c = a + b 的流程如下所示： 但如果是 C 的两个浮点数相加，那么编译之后就是一条简单的机器指令，然而 Python 则需要额外做很多其它工作。并且后续在介绍整数的时候，你会发现 Python 的整数相加更麻烦，但对于 C 而言同样是一条简单的机器码就可以搞定。 所以为什么 Python 会比 C 慢很多倍，从一个简单的加法上面就可以看出来。 以上是浮点数的加法操作，至于减法、乘法、除法等操作也是类似的。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) a = a + b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_sub(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"subtract\", return 0) a = a - b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_mul(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"multiply\", return 0) a = a * b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_div(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); if (b == 0.0) { PyErr_SetString(PyExc_ZeroDivisionError, \"float division by zero\"); return NULL; } PyFPE_START_PROTECT(\"divide\", return 0) a = a / b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} 代码逻辑是类似的，整个过程就是将 Python 浮点数里面的值抽出来，得到 C 浮点数，然后进行运算，再基于运算的结果创建 Python 浮点数，并返回它的泛型指针。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的算数操作","id":"58","title":"浮点数的算数操作"},"59":{"body":"到此浮点数就介绍完了，之所以先介绍浮点数，是因为浮点数最简单。至于整数，其实并没有那么简单，因为它的值在底层是通过数组存储的。而浮点数的值则是用一个 double 类型的字段来维护，会更简单一些，所以我们就先拿浮点数开刀了。 首先我们介绍了浮点数的创建和销毁，创建有两种方式，分别是使用对象的特定类型API 和调用类型对象。前者速度更快，但只适用于内置数据结构，而后者更加通用。 销毁的时候则调用类型对象内部的 tp_dealloc 字段指向的 float_dealloc 函数。当然为了保证效率，避免内存的频繁创建和回收，解释器为浮点数引入了缓存池机制，我们也分析了背后的原理。 最后浮点数还支持数值运算，PyFloat_Type 的 tp_as_number 字段指向了 PyNumberMethods 结构体实例 float_as_number，里面有大量的函数指针，每个指针指向了具体的函数，专门用于浮点数的运算。至于运算的具体逻辑，我们也以加法为例详细介绍了 float_add 函数的实现。核心就是将 Python 对象内部的值抽出来，转成 C 的类型，然后运算，最后再根据运算的结果创建 Python 对象，并返回泛型指针。 关于浮点数，如果你还想知道它的更多内容，可以进入源码中，大肆探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 小结","id":"59","title":"小结"},"6":{"body":"再来看看变量之间的传递，在 Python 中是如何体现的。 a = 666\nprint(hex(id(a))) # 0x1f4e8ca7fb0 b = a\nprint(hex(id(b))) # 0x1f4e8ca7fb0 我们看到打印的地址是一样的，再用一张图解释一下。 a = 666 的时候，先开辟一份内存，再让 a 存储对应内存的地址；然后 b = a 的时候，会把 a 拷贝一份给 b，所以 b 和 a 存储了相同的地址，它们都指向了同一个对象。 因此说 Python 是值传递、或者引用传递都是不准确的，准确的说 Python 是变量的值传递，对象的引用传递。因为 Python 的变量可以认为是 C 的一个指针，在 b = a 的时候，等于把 a 指向的对象的地址（a 本身）拷贝一份给 b，所以对于变量来说是值传递；然后 a 和 b 又都是指向对象的指针，因此对于对象来说是引用传递。 在这个过程中，对象没有重复创建，它只是多了一个引用。 另外还有最关键的一点，Python 的变量是一个指针，当传递变量的时候，传递的是指针；但是在操作变量的时候，会操作变量指向的内存。所以 id(a) 获取的不是 a 的地址，而是 a 指向的内存的地址（在底层其实就是 a 本身）；同理 b = a，是将 a 本身，或者说将 a 存储的、指向某个具体的对象的地址传递给了 b。 另外在 C 的层面，显然 a 和 b 属于指针变量，那么 a 和 b 有没有地址呢？显然是有的，只不过在 Python 中是获取不到的，解释器只允许获取对象的地址。 我们再举个函数的例子： def some_func(num): print(\"address of local num\", hex(id(num))) num = 667 print(\"address of local num\", hex(id(num))) num = 666\nprint(\"address of global num\", hex(id(num)))\nsome_func(num)\n\"\"\"\naddress of global num 0x2356cd698d0\naddress of local num 0x2356cd698d0\naddress of local num 0x2356c457f90\n\"\"\" 函数的参数也是一个变量，所以 some_func(num) 其实就是把全局变量 num 存储的对象的地址拷贝一份给局部变量 num，所以两个 num 指向了同一个对象，打印的地址相同。然后函数内部又执行了 num = 667，相当于让局部变量指向新的对象，或者说保存新对象的地址，因此打印的结果发生变化。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 值传递？引用传递？","id":"6","title":"值传递？引用传递？"},"60":{"body":"本篇文章来聊一聊复数，尽管在日常开发中基本用不到复数，但对它有一个深刻的认识，知道它是做什么的，个人觉得还是很有必要的。另外，本系列力求精致、详细，因此每一个细节都要到位。 那么下面就来解释一下什么是复数。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 楔子","id":"60","title":"楔子"},"61":{"body":"复数是一种用来扩展实数的数，它由实数和虚数两部分组成，用来解决实数范围内无法解决的问题，基本形式如下。 形如 a + bi 的数，我们称之为复数，其中 a 和 b 是浮点数（实数），i 是虚数，满足 i 的平方等于 -1。 所以复数不仅包含实数，还包含虚数，形式为 a + bi，然后 a 被称为复数的实部，b 被称为复数的虚部。如果两个复数的实部相同，虚部相反，那么它们互为共轭复数，比如 1 + 3i 和 1-3i。 如果对复数的实部和虚部进行平方和再开根号，便可得到复数的模，比如 3 + 4i 的模便是 5。 复数的引入可以帮助我们更好地理解和解决许多数学以及物理问题，特别是在涉及振动、波动和电路分析等领域，比如： 电工程：分析交流电路和信号处理； 控制系统：用于系统稳定性分析； 量子力学：描述波函数和量子态； 流体力学：用于描述流动问题； 当然复数也有自己的运算规则。 加法：两个复数相加等于对应的实部和虚部分别相加 减法：两个复数相减等于对应的实部和虚部分别相减 乘法：两个复数的乘法使用分配率 除法：两个复数的乘法涉及到共轭复数 以上就是复数的基本概念，下面来看看 Python 的复数是怎么实现的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 什么是复数","id":"61","title":"什么是复数"},"62":{"body":"复数的实现比想象中要简单很多，说白了就是维护两个浮点数而已。 // Include/complexobject.h\ntypedef struct { double real; double imag;\n} Py_complex; typedef struct { PyObject_HEAD Py_complex cval;\n} PyComplexObject; 我们看到复数的结构和浮点数是非常相似的，只不过浮点数只用一个 double 来维护具体的值。而复数因为存在实部和虚部，因此需要两个 double，其中 real 维护复数的实部，imag 维护复数的虚部。 # 在别的语言中，虚数都是用 i 来表示\n# 而 Python 觉得 i 是一个很常用的变量，所以使用 j 来表示虚数\ncpx = 3 + 4j\n# 其中 3 为实部，4 为虚部\nprint(cpx) # (3+4j)\n# 如果虚部为 1，那么要写成 1j，不能只写 j，否则解释器会认为 j 是一个变量\nprint(3 + 1j) # (3+1j)\n# 复数的实部可以为 0\nprint(2j) # 2j\n# 当然虚部也可以为 0，如果虚部为 0，那么要写成 0j，不能不写\n# 因为 3 和 3+0j 不是等价的，前者是整数，后者是复数\nprint(0j) # 0j\nprint(3 + 0j) # (3+0j) 整个过程非常简单，当解释器看到 3 + 4j 的时候，就知道要创建复数了，因为解释器对内置的数据结构了如指掌，所以在底层会创建一个 PyComplexObject 结构体实例。 没有什么难度，和浮点数是类似的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的底层结构","id":"62","title":"复数的底层结构"},"63":{"body":"类型对象定义的操作，决定了实例对象的行为，所以我们需要查看复数的类型都定义了哪些操作。复数的类型在 Python 里面对应 <class 'complex'>，那么根据解释器的命名规则，它在底层应该由 PyComplex_Type 负责实现。 // Objects/complexobject.c\nPyTypeObject PyComplex_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"complex\", sizeof(PyComplexObject), // ... &complex_as_number, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ // ... complex_richcompare, /* tp_richcompare */ // ... complex_methods, /* tp_methods */ complex_members, /* tp_members */ // ...\n}; complex 的类型也是 type，它的实例对象的大小就是 PyComplexObject 结构体的大小。然后我们看下它的 tp_members，该字段表示实例对象有哪些属性，它被赋值为 complex_members。 它有两个属性，分别是 real 和 imag，类型为 double，并且是只读的。那么在 Python 里面创建复数之后，便可以获取 real 和 imag 属性。 cpx = 3 + 4j\n# 注意：虽然写的是 3 + 4j，但实部和虚部都是浮点数\nprint(cpx.real) # 3.0\nprint(cpx.imag) # 4.0 然后 complex 类型还实现了 tp_richcompare，用于复数之间的比较，但对于复数来说，比较操作只支持等于和不等于。 // Objects/complexobject.c\nstatic PyObject *\ncomplex_richcompare(PyObject *v, PyObject *w, int op)\n{ PyObject *res; // 比较结果 Py_complex i; // 复数的实部和虚部组成的结构体 int equal; // 两个复数是否相等 // 如果 op 不是 ==、也不是 !=，那么报错 // 因为复数只支持这两种比较操作 if (op != Py_EQ && op != Py_NE) { goto Unimplemented; } assert(PyComplex_Check(v)); // 获取复数 v 的 cval 字段，并赋值给 i // 即 i = ((PyComplexObject *) v)->cval TO_COMPLEX(v, i); if (PyLong_Check(w)) { // ... } else if (PyFloat_Check(w)) { // ... } else if (PyComplex_Check(w)) { Py_complex j; // j = ((PyComplexObject *) w)->cval TO_COMPLEX(w, j); // 如果实部和虚部都相等，那么两个复数相等 equal = (i.real == j.real && i.imag == j.imag); } else { goto Unimplemented; } // equal 为 1，表示两个复数相等，为 0 表示两个复数不相等 // 如果 op 为 Py_EQ，那么相等返回 True，不等返回 False // 如果 op 为 Py_NE，那么相等返回 False，不等返回 True if (equal == (op == Py_EQ)) res = Py_True; else res = Py_False; Py_INCREF(res); return res; Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 以上就是复效的比较，核心就是比较对应的实部和虚部是否均相等。 由于复数也属于数值型对象，所以它也实现了 tp_as_number 方法簇。 我们以复数的加法和减法为例，看一下源码细节。 // Objects/complexobject.c // 负责将两个 Py_complex 结构体实例相加\nPy_complex\n_Py_c_sum(Py_complex a, Py_complex b)\n{ // 复数的值由 Py_complex 结构体维护，它里面有 real 和 imag 两个字段 Py_complex r; // 两个 Py_complex 实例相加的时候，等于内部的 real 和 imag 字段分别相加 r.real = a.real + b.real; r.imag = a.imag + b.imag; return r;\n} // 负责将两个 Py_complex 结构体实例相减\nPy_complex\n_Py_c_diff(Py_complex a, Py_complex b)\n{ Py_complex r; r.real = a.real - b.real; r.imag = a.imag - b.imag; return r;\n} // 基于 Py_complex 创建 PyComplexObject\nPyObject *\nPyComplex_FromCComplex(Py_complex cval)\n{ PyComplexObject *op; // 为 PyComplexObject 结构体实例申请内存 // 我们看到内存大小可以直接计算出来，因为内置数据结构在底层是写死的 // 解释器对它们了如指掌，直接通过 sizeof 算一下即可，不需要借助类型对象 op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject)); // 如果 op 为 NULL，表示内存不够，申请失败 if (op == NULL) return PyErr_NoMemory(); // 初始化引用计数，并将 op->ob_type 初始化为 &PyComplex_Type // 也就是让实例对象和类型对象建立联系 (void)PyObject_INIT(op, &PyComplex_Type); // 最后初始化 cval 字段，它是 Py_complex 结构体实例，负责维护复数具体的值 op->cval = cval; // 转成泛型指针 PyObject * 之后返回 return (PyObject *) op;\n} // 复数的加法\nstatic PyObject *\ncomplex_add(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_add\", return 0) // 调用 _Py_c_sum 进行相加，得到新的 Py_complex result = _Py_c_sum(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} // 复数的减法\nstatic PyObject *\ncomplex_sub(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_sub\", return 0) // 调用 _Py_c_diff 进行相减，得到新的 Py_complex result = _Py_c_diff(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} 以上就是复数的加法和减法，比较简单，至于其它操作，感兴趣可以自己阅读一下源码。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的行为","id":"63","title":"复数的行为"},"64":{"body":"本次我们就介绍了复数的底层结构以及它的一些相关操作，总的来说和浮点数是比较像的。不过还是像上面说的那样，对于我们日常开发来说，复数用的并不多，甚至可以说是几乎不用，但通过它来加深对源码的理解以及感受 Python 对象的设计哲学，还是非常有意义的。 下一篇文章来说一说整数，我们知道 Python 整数不会溢出，那么它是怎么设计的呢？背后有什么黑科技呢？我们下一篇文章再聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 小结","id":"64","title":"小结"},"65":{"body":"本篇文章来分析一下 Python 整数的实现原理，我们知道 Python 整数是不会溢出的，换句话说它可以计算无穷大的数。只要你的内存足够，它就能计算，但对于 C 来说显然是不行的，C 能保存的整数范围是有限的。 但问题是，Python 的底层是 C 实现的，那么它是怎么做到整数不溢出的呢？想要知道答案，那么看一下整数在底层是怎么定义的就行了。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 楔子","id":"65","title":"楔子"},"66":{"body":"Python 整数在底层由 PyLongObject 结构体负责承载，看一下它的定义。 // Include/longobject.h\ntypedef struct _longobject PyLongObject; // Include/longintrepr.h\nstruct _longobject { PyObject_VAR_HEAD digit ob_digit[1];\n}; 里面每个字段的含义如下： ob_refcnt：对象的引用计数； ob_type：对象的类型； ob_size：数组 ob_digit 的长度； ob_digit：digit 类型的数组； 别的先不说，就冲里面的 ob_size 我们就可以思考一番。首先 Python 的整数有大小、但应该没有长度的概念吧，那为什么会有一个 ob_size 呢？从结构体字段来看，这个 ob_size 表示数组 ob_digit 的长度，而这个 ob_digit 显然是用来维护具体的值。 相信你已经猜到 Python 整数不会溢出的秘密了，因为它内部通过数组来存储整数，所以能存储无限大的数。因此答案出来了，虽然整数没有我们生活中的那种长度的概念，但它是个变长对象，因为不同的整数占用的内存可能是不一样的。尽管它没有字符串、列表那种长度的概念，或者说无法对整数使用 len 函数，但它是个变长对象。 接下来的重点就是这个 ob_digit 数组，我们要从它的身上挖掘信息，看看整数是怎么放在里面的，不过首先我们要搞清楚这个 digit 是什么类型。 // Include/longintrepr.h\n#if PYLONG_BITS_IN_DIGIT == 30 typedef uint32_t digit;\n#elif PYLONG_BITS_IN_DIGIT == 15 typedef unsigned short digit;\n#else #error \"PYLONG_BITS_IN_DIGIT should be 15 or 30\" PYLONG_BITS_IN_DIGIT 是一个宏，这个宏是做什么的我们先不管，总之如果机器是 64 位的，那么它会被定义为 30，机器是 32 位的，则会被定义为 15。而现在的机器基本都是 64 位的，所以 PYLONG_BITS_IN_DIGIT 等于 30，因此 digit 等价于 uint32_t，即 unsigned int。 因此 ob_digit 是一个无符号 32 位整型数组，至于长度，虽然声明为 1，但其实没有限制，你可以当成任意长度的数组来用，这是 C 语言的一个常见特性。和 Go 不同，C 数组的长度不属于类型信息。至于数组具体多长，取决于存储的整数有多大，显然整数越大，这个数组就越长，占用的空间也就越大。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数的底层结构","id":"66","title":"整数的底层结构"},"67":{"body":"了解了 ob_digit 数组之后，来分析一下它是怎么存储整数的？ 首先抛出一个问题，如果你是 Python 的设计者，要保证整数不会溢出，你会怎么办？我们不妨再把问题简化一下，假设有一个 8 位无符号整数类型，我们知道它能表示的最大数字是 255，但这时候如果要表示 256，该怎么办呢？ 可能有人会想，那用两个数来存储不就好了，一个存储 255，一个存储 1，然后将这两个数放在数组里面。这个答案虽然有些接近，但其实还有偏差：就是我们并不能简单地按照大小拆分，比如 256 拆分成 255 和 1，要是 265 就拆分成 255 和 10，不能这样拆分，而是要通过二进制的方式，也就是用新的整数来模拟更高的位。 如果感到困惑的话没有关系，我们以 Python 整数的底层存储为例，来详细解释一下这个过程。解释器实现整数也是通过我们上面说的这种方式，但考虑的会更加全面一些。 整数 0 注意：当表示的整数为 0 时，ob_digit 数组为空，不存储任何值。而 ob_size 为 0，表示这个整数的值为 0，这是一种特殊情况。 整数 1 整数 -1 我们看到 ob_digit 数组没有变化，但是 ob_size 变成了 -1。没错，整数的正负是通过 ob_size 决定的，ob_digit 存储的其实是绝对值。无论整数 n 是多少，-n 和 n 对应的 ob_digit 是完全一致的，但是 ob_size 则互为相反数。所以 ob_size 除了表示数组的长度之外，还可以表示对应整数的正负。 因此我们之前说整数越大，底层的 ob_digit 数组就越长。更准确地说是绝对值越大，底层数组就越长。所以 Python 在比较两个整数的大小时，会先比较 ob_size，如果 ob_size 不一样则可以直接比较出大小。显然 ob_size 越大，对应的整数越大，不管 ob_size 是正是负，都符合这个结论。 整数 2 ** 30 - 1 如果想表示 2 ** 30 - 1，那么也可以使用一个 digit 表示。话虽如此，但为什么突然说这个数字呢？答案是：虽然 digit 是 4 字节、32 位，但解释器只用 30 个位。 之所以这么做是和加法进位有关系，如果 32 个位全部用来存储其绝对值，那么相加产生进位的时候，可能会溢出。比如 2 ** 32 - 1，此时 32 个位全部占满了，即便它只加上 1，也会溢出。那么为了解决这个问题，就需要先强制转换为 64 位整数再进行运算，从而会影响效率。但如果只用 30 个位的话，那么加法是不会溢出的。 因为 30 个位最大就是 2 ** 30 - 1，即便两个这样的数相加，结果也是 2 ** 31 - 2。而 32 个位最大能表示 2 ** 32 - 1，所以肯定不会溢出的。如果一开始 30 个位就存不下，那么数组中会有两个 digit。 所以虽然将 32 位全部用完，可以只用一个 digit 表示更大的整数，但会面临相加之后一个 digit 存不下的情况，于是只用 30 个位。如果数值大到 30 个位存不下的话，那么就会多使用一个 digit。 这里可能有人发现了，如果使用 31 个位的话，那么相加产生的最大值就是 2 ** 32 - 2，依旧可以使用一个 32 位整型存储啊，那 Python 为啥要牺牲两个位呢？答案是为了乘法运算。 为了方便计算乘法，需要多保留 1 位用于计算溢出。这样当两个整数相乘的时候，可以直接按 digit 计算，并且由于兼顾了\"溢出位\"，可以把结果直接保存在一个寄存器中，以获得最佳性能。 具体细节就不探究了，只需要知道整数在底层是使用 unsigned int 类型的数组来维护具体的值即可，并且虽然该类型的整数有 32 个位，但解释器只用 30 个位。 然后还记得我们在看 digit 类型的时候，说过一个宏吗？PYLONG_BITS_IN_DIGIT，在 64 位机器上等于 30，在 32 位机器上等于 15。相信这个宏表示的是啥你已经清楚了，它代表的就是使用的 digit 的位数。 整数 2 ** 30 问题来了，我们说 digit 只用 30 个位，所以 2 ** 30 - 1 是一个 digit 能存储的最大值。而现在是 2 ** 30，所以数组中就要有两个 digit 了。 我们看到此时就用两个 digit 来存储了，然后数组里面的元素是 0 和 1，而且充当高位的放在后面，因为是使用新的 digit 来模拟更高的位。由于一个 digit 只用 30 位，那么数组中第一个 digit 的最低位就是 1，第二个 digit 的最低位就是 31，第三个 digit 的最低位就是 61，以此类推。 所以如果 ob_digit 为 [a, b, c]，那么对应的整数就等于： 如果 ob_digit 不止 3 个，那么就按照 30 个位往上加，比如 ob_digit 还有第四个元素 d，那么就再加上 d * 2 ** 90 即可。 以上就是 Python 整数的存储奥秘，说白了就是串联多个小整数来表达大整数。并且这些小整数之间的串联方式并不是简单的相加，而是将各自的位组合起来，共同形成一个具有更高位的大整数，比如将两个 32 位整数串联起来，表示 64 位整数。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 探究整数的秘密","id":"67","title":"探究整数的秘密"},"68":{"body":"下面我们再分析一下，一个整数要占用多大的内存。 相信所有人都知道可以使用 sys.getsizeof 计算内存大小，但是这大小到底是怎么来的，估计会一头雾水。因为 Python 中对象的大小，是根据底层的结构体计算出来的。 由于 ob_refcnt、ob_type、ob_size 这三个是整数所必备的，它们都是 8 字节，加起来 24 字节，所以任何一个整数所占内存都至少 24 字节。至于具体占多少，则取决于 ob_digit 里面的元素有多少个。 因此整数所占内存等于 24 + 4 * ob_size的绝对值。 import sys # 如果是 0 的话，ob_digit 数组为空，所以大小就是 24 字节\nprint(sys.getsizeof(0)) # 24 # 如果是 1 的话，ob_digit 数组有一个元素，所以大小是 24 + 4 = 28 字节\nprint(sys.getsizeof(1)) # 28\n# 同理\nprint(sys.getsizeof(2 ** 30 - 1)) # 28 # 一个 digit 只用 30 位，所以最大能表示 2 ** 30 - 1\n# 如果是 2 ** 30，那么就需要两个元素，所以大小是 24 + 4 * 2 = 32 字节\nprint(sys.getsizeof(2 ** 30)) # 32\nprint(sys.getsizeof(2 ** 60 - 1)) # 32 # 如果是两个 digit，那么能表示的最大整数就是 2 ** 60 - 1\n# 因此 2 ** 60 需要三个 digit，所以大小是 24 + 4 * 3 = 36 字节\nprint(sys.getsizeof(1 << 60)) # 36\nprint(sys.getsizeof((1 << 90) - 1)) # 36 print(sys.getsizeof(1 << 90)) # 40 所以整数的大小就是这么计算的，当然不光整数，其它的对象也是如此，计算的都是底层结构体的大小。 另外我们也可以反推一下，如果有一个整数 88888888888，那么它对应的底层数组 ob_digit 有几个元素呢？每个元素的值又是多少呢？下面来分析一波。 import numpy as np # 假设占了 n 个位\n# 由于 n 个位能表达的最大整数是 2 ** n - 1\na = 88888888888\n# 所以只需获取以 2 为底、a + 1 的对数，即可算出 n 的大小\nprint(np.log2(a + 1)) # 36.371284042320475 计算结果表明，如果想要存下这个整数，那么至少需要 37 个位。而 1 个 digit 用 30 个位，很明显需要两个 digit。 # 如果 ob_digit 有两个元素\n# 那么对应的整数就等于 ob_digit[0] + ob_digit[1] * 2 ** 30\na = 88888888888\nprint(a // 2 ** 30) # 82\nprint(a - 82 * 2 ** 30) # 842059320 所以整数 88888888888 在底层对应的 ob_digit 数组为 [842059320, 82]，下面修改解释器，来验证这一结论。 我们看到结果和我们分析的是一样的，但这种办法有点麻烦，我们可以通过之前说的 ctypes 来构造底层的结构体，在 Python 的层面模拟 C 的行为。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 2) ] a = 88888888888\n# 基于对象的地址构造 PyLongObject 对象\nlong_obj = PyLongObject.from_address(id(a))\n# 打印结果和我们预期的一样\nprint(long_obj.ob_digit[0]) # 842059320\nprint(long_obj.ob_digit[1]) # 82 # 如果将 ob_digit[1] 改成 28，那么 a 会变成多少呢？\n# 很简单，算一下就知道了\nlong_obj.ob_digit[1] = 28\nprint(842059320 + 28 * 2 ** 30) # 30906830392\n# 那么 a 会不会也打印这个结果呢？毫无疑问，肯定会的\nprint(a) # 30906830392 # 并且前后 a 保存的地址没有发生改变，因为我们修改的是底层数组\n# 因此所谓的可变和不可变，都只是根据 Python 的表现抽象出来的\n# 或者说，对象是否可变，取决于解释器有没有将修改对象的接口暴露出来\n# 要是解释器没有提供修改对象的接口，那么对象就是不可变的\n# 但如果站在解释器的层面上看，则没啥可变或不可变，一切都由我们决定 通过打印 ob_digit 存储的值，我们验证了得出的结论，原来 Python 是通过数组来存储整数，并且数组的类型虽然是无符号 32 位整数，但是只用 30 个位。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数占的内存大小是怎么计算的","id":"68","title":"整数占的内存大小是怎么计算的"},"69":{"body":"以上我们就探究了 Python 整数的秘密，它是怎么实现的。不过还没有结束，后续还要继续分析小整数对象池，以及整数的行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 小结","id":"69","title":"小结"},"7":{"body":"当提到类型时，这个类型指的是变量的类型还是对象的类型呢？不用想，肯定是对象的类型。因为 Python 的变量是个指针，操作指针会自动操作它指向的内存，所以使用 type(a) 查看的其实是变量 a 指向的对象的类型。 那么问题来了，我们在创建变量的时候，并没有显式地指定类型啊，那么解释器是如何判断一个变量指向什么类型的数据呢？答案是：解释器是通过靠猜的方式，通过赋的值（或者说变量引用的值）来推断类型。 因此在 Python 中，如果你想创建一个变量，那么必须在创建变量的时候同时赋值，否则解释器就不知道这个变量指向的数据是什么类型。所以 Python 是先创建相应的值，这个值在 C 中对应一个结构体，结构体里面有一个字段专门用来记录该值对应的类型，因此在 Python 中，类型是和对象绑定的，而不是和变量。当创建完值之后，再让这个变量指向它，所以 Python 中是先有值后有变量。 但在 C 里面显然不是这样的，因为 C 的变量代表的内存所存储的就是具体的值，所以在 C 里面可以直接声明一个变量的同时不赋值。因为 C 要求声明变量时必须指定类型，所以变量声明之后，其类型和内存大小就已经固定了。 而 Python 的变量存的是个地址，它只是指向了某个对象，所以由于其便利贴的特性，可以贴在任意对象上面。但是不管贴在哪个对象，都必须先有对象才可以，不然变量贴谁去。 另外，尽管 Python 在创建变量的时候不需要指定类型，但 Python 是强类型语言，而且是动态强类型。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量有类型吗？","id":"7","title":"变量有类型吗？"},"70":{"body":"之前分析过浮点数的创建，而整数的创建与之是类似的，都是基于字面量形式的 C 数据创建 Python 数据。 创建浮点数可以使用 PyFloat_FromDouble、PyFloat_FromString 等； 创建整数可以使用 PyLong_FromLong、PyLong_FromDouble、PyLong_FromString 等； 创建整数的这些函数直接去 Objects/longobject.c 里面查看即可，这里就不多说了，我们重点来看一下小整数对象池。 我们知道整数属于不可变对象，运算之后会创建新的对象。 >>> a = 666\n>>> id(a)\n140078521506224\n>>> a += 1\n>>> id(a)\n140078521506096\n>>> 显然这种做法一定存在性能缺陷，因为程序运行时会有大量的对象创建和销毁。根据浮点数的经验，我们猜测 Python 应该也对整数使用了缓存池吧。答案是差不多，只不过不是缓存池，而是小整数对象池。 一些使用频率高的整数在创建之后，会被保存在一个静态数组里面，我们称之为小整数对象池。 看一下小整数对象池的实现。 // Objects/longobject.c #define NSMALLPOSINTS 257\n#define NSMALLNEGINTS 5 static PyLongObject small_ints[NSMALLNEGINTS + NSMALLPOSINTS]; 数组 small_ints 便是小整数对象池，它是一个类型为 PyLongObject、长度为 262 的数组，里面缓存了 -5 到 256 之间的整数。当然这只是解释器的默认行为，因为 -5 到 256 之间的整数使用频率最高，但你也可以根据自身情况修改源码，让它缓存更多的整数，以提升效率，当然这也会额外占用一些内存。 小整数对象池是预先创建好的，里面的整数全局唯一，我们来验证一下。 >>> n1 = 256\n>>> n2 = 256\n>>> id(n1), id(n2)\n(140078528922016, 140078528922016)\n>>> >>> n1 = 257\n>>> n2 = 257\n>>> id(n1), id(n2)\n(140078521507472, 140078521506704)\n>>> 256 位于小整数对象池内，所以全局唯一，需要使用的话直接去取即可，因此它们的地址是一样的。但 257 不在小整数对象池内，所以它们的地址不一样。 另外上面的代码是交互式执行的，但如果有小伙伴不是通过交互式，那么打印地址的时候会得到出乎意料的结果。 a = 257\nb = 257\nprint(id(a) == id(b)) # True 可能有人会好奇，为什么地址又是一样的了，257 明明不在小整数对象池中啊。虽然涉及到了后面的内容，但提前解释一下也是可以的。主要区别就在于一个是交互式执行的，另一个是通过 python3 xxx.py 的方式执行的。 首先 Python 的编译单元是函数，每个函数都有自己的作用域，在这个作用域中出现的所有常量都是唯一的，并且都位于常量池中，由 co_consts 指向。虽然上面的对象不在函数中，而是在全局作用域中，但全局也可以看成是一个函数，它也是一个独立的编译单元。同一个编译单元中，相同的常量只会出现一次。 当执行 a = 257 的时候，会创建 257 这个整数，并放入常量池中。所以 b = 257 的时候就不会再创建了，因为常量池中已经有了，所以会直接从常量池中获取，因此它们的地址是一样的，因为是同一个 PyLongObject。 而对于交互式环境来说，因为输入一行代码就会立即执行一行，所以任何一行可独立执行的代码都是一个独立的编译单元。注意：是可独立执行的代码，比如变量赋值、函数、方法调用等等。但如果是 if、for、while、def 等需要多行表示的逻辑，比如 if 2 > 1:，显然就不是一行可独立执行的代码，它还依赖你输入的下面的内容。 # 此时按下回车，我们看到不再是 >>>，而是 ...\n# 这代表还没有结束，还需要你输入下面的内容\n>>> if 2 > 1:\n... print(\"2 > 1\")\n... # 此时这个 if 语句整体才是一个独立的编译单元\n2 > 1\n>>> 但是像 a = 1、foo()、lst.appned(123) 这些显然是一行可独立执行的代码，因此在交互式中它们是独立的编译单元。 # 此时这行代码已经执行了，它是一个独立的编译单元\n>>> a = 257\n# 这行代码也是独立的编译单元，所以它里面的常量池为空，因此要重新创建 257\n>>> b = 257\n# 由于它们是不同常量池内的整数，所以 id 是不一样的\n>>> id(a), id(b)\n(140078521506768, 140078521506096) 再来看个例子。 >>> a = 666; b = 666\n>>> id(a), id(b)\n(140078521506512, 140078521506512)\n>>>\n>>> a, b = 777, 777\n>>> id(a), id(b)\n(140078521506224, 140078521506224) 666 和 777 明显不在常量池中，为啥 a 和 b 指向对象的地址是一样的呢？相信你能猜到原因，因为上面两种方式无论哪一种，都是在同一行，因此整体会作为一个编译单元。既然是同一个编译单元，那么常量池里面的每个常量只会创建一次，所以地址是一样的。 注意：常量池里面的常量一定在编译期间就可以确定，比如整数、浮点数、字符串等等，解释器在编译期间会静态收集起来，保存在常量池中。但如果编译期间无法确定，就不会静态收集了，举个例子。 >>> a, b = int(\"257\"), int(\"257\")\n>>> id(a), id(b)\n(140078521506768, 140078521506512)\n>>> >>> a, b = int(\"123\"), int(\"123\")\n>>> id(a), id(b)\n(140078528917760, 140078528917760)\n>>> >>> a, b = 258, 258\n>>> id(a), id(b)\n(140078521507632, 140078521507632) int(\"257\") 需要在运行时执行，因此会创建两个 257，然后赋值给 a 和 b，所以地址不一样。 int(\"123\") 虽然也在运行时执行，但解释器创建完之后发现 123 位于小整数对象池中，于是会直接从池子里面取，所以打印的地址一样。注意：int(\"123\") 肯定是会执行的，只是执行之后发现结果存在于小整数对象池中，会再将创建的对象销毁。 258 属于编译期间可以静态收集的常量，会被保存在常量池中，而常量池里的常量只会出现一次，所以打印的地址一样。 ⭐️：常量不仅仅是 123、\"hello\" 这种，像 2 ** 10、\"AAA\" + \"BBB\" 这种也属于常量，它们在编译之后会被替换为 1024、\"AAABBB\"，这个过程被称为常量折叠。 以上就是小整数对象池相关的内容，比较简单，因为小整数对象池就是一个数组，里面缓存了 -5 到 256 之间的 Python 整数，而这些整数可以直接拿来用。 下一篇文章我们来分析整数的运算，这也是最关键的地方。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"17. 解密 Python 的小整数对象池","id":"70","title":"17. 解密 Python 的小整数对象池"},"71":{"body":"通过考察整数的底层实现，我们明白了它能够保证不溢出的缘由。整数的值在底层是由 C 数组来维护的，通过组合多个 digit（uint32_t）来实现大整数的存储。这么做的好处就是 Python 整数没有大小限制了，因此不会溢出，而不会溢出是因为数组没有长度限制，所以只要你的内存足够，就可以存任意大的数。 Python 表示：存不下？会溢出？这都不是事儿，直接继续往数组里面塞 digit 就 ok 了。另外数组存的是绝对值，符号是通过 ob_size 体现的。 不过说实话，用数组实现大整数的做法非常普遍，并没有什么神秘的，就是将多个整数组合起来，模拟具有更高位的大整数。但这种实现方式的难点在于大整数的数学运算，它们才是重点，实现的时候比较考验编程技巧以及思维逻辑。 因此 Python 的整数比浮点数要复杂的多，浮点数在底层直接用 C 的 double 来维护具体的值，因此运算的话，比如相加，直接转成 C 的 double 做加法即可。但整数就不行了，在底层不能简单地将数组相加。 下面来看看具体实现。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 楔子","id":"71","title":"楔子"},"72":{"body":"先来看看整数的大小比较，由于整数具体的值是通过数组维护的，显然数组越长，整数的绝对值就越大，这是毫无疑问的。至于整数的正负，则由 ob_size 来体现。 因此可以得出一个结论：当两个整数在比大小时，可以先比较各自的 ob_size，如果 ob_size 不一样，可以直接比较出大小，并且 ob_size 越大，对应的整数越大。但如果两个整数的 ob_size 一样，那么就从数组 ob_digit 的尾部元素开始，不断向前进行比较。只要两个整数的 ob_digit 中有一个对应元素不相同，那么就可以比较出大小。 之所以从数组的尾部开始，是因为数组元素的索引越大，那么充当的位数就越高，而在比较的时候显然要从高位开始比。 # ob_digit = [892311, 32, 3]\na = 3458764548181171607\n# ob_digit = [2296, 31, 3]\nb = 3458764547106539768 我们以 a 和 b 为例，显然 a 大于 b，那么在底层，它们是如何比较的呢？ 如果 ob_size 不相等，那么可以直接比较出大小。但这里两个整数的 ob_size 是相等的，所以需要比较 ob_digit，并且是从后往前比。具体做法就是让索引从 ob_digit 长度减 1 开始，依次往前遍历。 因为 a->ob_digit[2] 等于 b->ob_digit[2]，此时无法比较出大小，因此索引减一，比较上一个元素。 因为 a->ob_digit[1] 大于 b->ob_digit[1]，所以成功比较出大小，可以得出 |a| 大于 |b|。 当然啦，由于数组反映的是绝对值的大小，所以还需要判断符号。 如果是正数，那么和绝对值相同。 但如果是负数，那么绝对值越大，对应的整数反而越小，因此比较之后的结果还要再乘上 -1。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 3) ] a = 3458764548181171607\nb = 3458764547106539768\nlong_obj1 = PyLongObject.from_address(id(a))\nlong_obj2 = PyLongObject.from_address(id(b))\nprint(list(long_obj1.ob_digit)) # [892311, 32, 3]\nprint(list(long_obj2.ob_digit)) # [2296, 31, 3] 以上就是整数的大小比较逻辑，下面再看一下具体的源码实现。 int 类型对象的 tp_richcompare 字段的值为 long_richcompare，所以具体的比较逻辑便由该函数负责实现。 // Objects/longobject.c static PyObject *\nlong_richcompare(PyObject *self, PyObject *other, int op)\n{ // 比较结果 int result; // 类型检测，确保 self 和 other 的类型都是整数 CHECK_BINOP(self, other); // self 和 other 都是泛型指针 PyObject * // 如果 self == other，说明指针保存的地址相同，它们指向的是同一个对象 // 因此可以直接判定两者相等 if (self == other) result = 0; else // 否则调用 long_compare，将对象维护的 ob_digit 抽出来，挨个比较 // 如果 self > other，那么 result 为 1 // 如果 self == other，那么 result 为 0 // 如果 self < other，那么 result 为 -1 result = long_compare((PyLongObject*)self, (PyLongObject*)other); // 一会儿解释 Py_RETURN_RICHCOMPARE(result, 0, op);\n} 在 Python 中不同的算术操作符会对应不同的魔法方法，而在 C 中均由 long_richcompare 函数实现。 而在 long_richcompare 里面，不管操作符是什么，result 都是固定的。 如果 self > other，那么 result 为 1； 如果 self == other，那么 result 为 0； 如果 self < other，那么 result 为 -1； 不管我们传入的操作符 op 是什么，都不影响上面的结论，因为 result 只是表达了 self 和 other 之间的关系。然后再看一下结尾的 Py_RETURN_RICHCOMPARE 这个宏，它的定义如下。 // Include/object.h\n#define Py_RETURN_RICHCOMPARE(val1, val2, op) \\ do { \\ switch (op) { \\ case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ default: \\ Py_UNREACHABLE(); \\ } \\ } while (0) 这个宏做的事情很简单，就是基于操作符比较 val1 和 val2，如果 if 条件成立，返回 Python 的 True，否则返回 Python 的 False。而在 long_richcompare 里面，最后调用这个宏的时候，给 val1、val2 传的是 result 和 0。注意：这一步稍微有点绕，我们举个例子就简单了。 假设 self = 5，other = 6，我们要判断 self > other 是 True 还是 False。 首先 self 小于 other，因此在 long_richcompare 里面比较之后，result 会等于 -1。那么调用宏的时候，传的三个参数就是 -1、0、Py_GT。然后执行对应分支，发现 val1 > val2 不成立，于是返回 False，因此 self > other 的结果也是 False。 所以 long_richcompare 里面的 result 只是通过 1、0、-1 描述了 self 和 other 之间的关系（C 语言的特点之一），而判断 self > other 最终等价于判断 result > 0，同理其它操作符也是如此。 再举个例子，假设要判断 self <= other，那么最终等价于判断 result <= 0。 如果 self > other，那么 result 就是 1，而 1 <= 0 不成立，所以 self <= other 就是 False。 如果 self == other，那么 result 就是 0，而 0 <= 0 成立，所以 self <= other 就是 True。 如果 self < other，那么 result 就是 -1，而 -1 <= 0 成立，所以 self <= other 就是 True。 因此最后这一步还是很巧妙的，但也稍微有一点绕。估计有人会好奇，为啥不能像浮点数那样直接比较呢？其实原因很好想，因为浮点数在底层使用 double 类型的字段来维护具体的值，比较逻辑非常简单。但整数不同，由于整数的值是通过数组维护的，比较起来非常复杂，如果还按照上面那种做法，那么每个分支里面会存在大量重复代码。 所以整数在比较的时候，先不管指定的操作符是什么，而是先判断两个数的大小关系。如果两个数是大于关系，那么给 result 赋值为 1；等于关系，赋值为 0；小于关系，赋值为 1。 最后将两个整数的比较操作，转成 result 和 0 的比较操作，这个实现思路非常巧妙，你在工作中也可以用起来。 但是还没结束，我们还有最关键的一步没有看。 显然这最关键的一步就在 long_compare 身上，它负责具体的比较逻辑。 // Objects/longobject.c static int\nlong_compare(PyLongObject *a, PyLongObject *b)\n{ Py_ssize_t sign; // 如果两个整数的 ob_size 不一样，那么直接可以比较出大小 if (Py_SIZE(a) != Py_SIZE(b)) { sign = Py_SIZE(a) - Py_SIZE(b); } else { // 否则说明 ob_size 一样，那么获取 ob_size 的绝对值，即数组 ob_digit 的长度 Py_ssize_t i = Py_ABS(Py_SIZE(a)); // 从后往前依次比较数组元素的大小 while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果两个数组的元素全部一样，那么 i 最终会等于 -1 if (i < 0) sign = 0; // 否则说明两个数组中索引为 i 的元素存在不同 else { // 那么比较大小 sign = (sdigit)a->ob_digit[i] - (sdigit)b->ob_digit[i]; // 如果 ob_size < 0，说明是负数，那么比较结果还要再乘上 -1 if (Py_SIZE(a) < 0) sign = -sign; } } // 如果 a < b，那么 sign < 0，直接返回 -1 // 如果 a == b，那么 sign == 0，直接返回 0 // 如果 a > b，那么 sign > 0，直接返回 1 return sign < 0 ? -1 : sign > 0 ? 1 : 0;\n} 以上就是 Python 整数的比较逻辑，所以一个简单的整数比较，Python 底层居然做了这么多工作。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 整数的大小比较","id":"72","title":"整数的大小比较"},"73":{"body":"以上就是整数的比较逻辑，所以用数组实现大整数的思路没什么特别的，但难点就在于运算。而为了方便大家理解和消化，本篇文章暂时只介绍比较操作，下一篇文章来介绍整数的运算。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 小结","id":"73","title":"小结"},"74":{"body":"本篇文章来探讨一下整数的加减法是怎么做的，因为整数在底层采用数组进行存储，所以它的加减法就不像浮点数那么简单。 在介绍浮点数的时候说过，对于数值型对象，它的类型一定实现了 tp_as_number 字段，该字段指向了 PyNumberMethods 结构体实例。结构体里面的每个字段都是一个函数指针，对应数值型对象的一个操作。 比如 nb_add 负责加法操作，nb_substract 负责减法操作等等，本篇文章就来探讨一下。首先整数支持的操作非常多，这里我们只探讨加减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 楔子","id":"74","title":"楔子"},"75":{"body":"整数的加法和减法分别由 long_add 和 long_sub 实现，但运算的核心却不在这两个函数上，它们内部会调用另外两个函数。因为数组保存了整数的绝对值，所以 Python 将整数的运算转成了绝对值运算，而底层有两个函数专门用来做这件事情，分别是 x_add 和 x_sub。 x_add(a, b)：计算 a 和 b 的绝对值之和； x_sub(a, b)：计算 a 和 b 的绝对值之差； 所以整数相加就可以这么做，假设两个整数 a 和 b 相加： 如果 a 和 b 均为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 如果 a 和 b 均为负数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 而整数相减也是同理，还是整数 a 和 b，两者相减： 如果 a 为正数，b 为负数，那么通过 x_add 计算两者的绝对值之和即可； 如果 a 为负数，b 为正数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 和 b 均为正数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果 a 和 b 均为负数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 相加时，符号相同会调用 x_add、符号不同会调用 x_sub。相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 所以这就是 Python 的设计，因为绝对值的加减法不用考虑符号的影响，实现更为简单，所以 Python 将整数运算转化成整数的绝对值运算。那么下面我们的重心就在 x_add 和 x_sub 上面了，看看它们是如何对大整数绝对值进行运算的。到这里你可能会有疑问，大整数运算这么复杂，效率会差吧。显然这是啃腚的，整数数值越大，整数对象的底层数组就越长，运算开销也就越大。 但 Python 底层有一个机制叫做快分支，因为通用逻辑能处理所有情况，那么它的效率必然不高。而快分支则是对那些可以简单运算的情况提前进行处理，比如在对 a 和 b 计算加减法的时候，底层会先判断数组的长度是否均小于等于 1，如果是则说明数组中最多只有一个元素。这样的话，就可以直接转成 C 的整数进行运算了，这样性能损耗就可以忽略不计。 关于快分支，需要再单独解释一下。我们举个生活中的例子：好比你去见女朋友，正常情况下，你需要买花，并且精心打扮。但如果女朋友不在生理期，那么这一切都不需要做，只需买杯奶茶就好了。所以先判断女朋友是否在生理期，如果不在，那么只需买杯奶茶就能牵手便属于快分支。快分支具有命中率高等特点，绝大部分都是这个情况，而一旦命中快分支，那么程序便可快速处理。 回到上面的例子，只要整数不超过 2 ** 30 - 1，都可以走快分支，显然这可以满足绝大部分场景，因为这个数字已经很大了。至于 x_add 和 x_sub 则属于通用逻辑，而通用也意味着平庸，但如果快分支没有命中，那么就只能走通用逻辑了。 而我们的重点就是要研究 x_add 和 x_sub 的实现，感受大整数运算的魅力。不过在介绍之前，不妨想象一下我们平时将两个整数相加的时候是怎么做的。 从最低位开始进行相加，逢十进一，ob_digit 也是同理。我们可以把数组中的每一个元素看成是一个整体，只不过它不再是逢十进一，而是逢 2 ** 30 进一。 # 数组的每个元素最大能表示 2 ** 30 - 1\n# 把元素整体想象成我们生活中加法的个位、十位、百位...\n# 然后对应的位相加，逢 2 ** 30 进一\na = [1024, 22]\nb = [342, 18]\nc = [1024 + 342, 22 + 18] # [1366, 40] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 所以仍旧是对应的位进行相加，和我们生活中的加法并无本质上的区别。只不过生活中的加法，每一位能表示 0~9，逢十进一。而 Python 底层的加法，因为整数使用数组存储，那么每一个位能表示 0 ~ 2 ** 30 - 1，逢 2 ** 30 进一。 把 1024、342 想象成个位，把 22、18 想象成十位，并且此时不再是逢十进一，而是逢 2 ** 30 进一。 a = [2 ** 30 - 1, 16]\nb = [2 ** 30 - 1, 21]\n# a[0] + b[0] 超过了 2 ** 30，要进个 1\n# 而逢十进一之后，该位要减去十\n# 那么逢 2 ** 30 进一之后，显然要减去 2 ** 30\nc = [ a[0] + b[0] - 2 ** 30, a[1] + b[1] + 1\n] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 然后是绝对值减法，和绝对值加法一样，也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，由于 7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 18。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]\n# 所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 然后是 a[1] - b[1]\n# 由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 结果没有问题，以上我们就从原理上介绍了大整数的加减法，下面再看一下源码实现。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法的运算原理","id":"75","title":"整数加减法的运算原理"},"76":{"body":"当整数相加时会执行 long_add 函数，看一下它的具体实现。 // Objects/longobject.c\nstatic PyObject *\nlong_add(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 // 由于 2 ** 30 - 1 已经很大了，所以绝大部分场景，都会执行此分支 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { // MEDIUM_VALUE 是一个宏，接收一个 abs(ob_size) <= 1 的 PyLongObject * // 如果 ob_size 等于 0, 那么返回 0 // 如果 ob_size 等于 1, 那么返回 ob_digit[0] // 如果 ob_size 等于 -1, 那么返回 -ob_digit[0] // 所以计算出 MEDIUM_VALUE(a) + MEDIUM_VALUE(b) 之后 // 将结果转成 PyLongObject，然后返回其泛型指针即可 // 因此当数组中元素个数不超过 1 的时候，显然是可以直接相加的 return PyLong_FromLong(MEDIUM_VALUE(a) + MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| + |b| if (Py_SIZE(b) < 0) { z = x_add(a, b); if (z != NULL) { // 然后对 z 取相反数 assert(Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } // 如果 a 是负数、b 是正数，那么计算 |b| - |a| else z = x_sub(b, a); } else { // 如果 a 是正数、b 是负数，那么计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| + |b| else z = x_add(a, b); } return (PyObject *)z;\n} 因此 long_add 函数并不长，但是调用了 x_add 和 x_sub，显然核心逻辑是在这两个函数里面。至于 long_add 函数，它的逻辑如下： 判断两个整数底层对应的数组的长度是否均小于等于 1，如果是的话那么通过宏 MEDIUM_VALUE 直接将其转成 C 的一个 digit，当然符号也会考虑在内。然后直接相加、返回即可。显然这里走的是快分支，或者说快速通道。 但如果其中一方的数组长度（ob_size）大于 1，那么判断两者的符号。如果都为负数，那么通过 x_add 计算两者的绝对值之和，然后取相反数。 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果都为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 所以 Python 整数设计的非常巧妙，ob_digit 虽然用来维护具体数值，但它并没有考虑正负，整数的正负是通过 ob_size 来表示的。通过将运算变成绝对值运算，实现起来会方便很多。 说完了 long_add，再来看看 long_sub，这两者是类似的。 // Objects/longobject.c\nstatic PyObject *\nlong_sub(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { return PyLong_FromLong(MEDIUM_VALUE(a) - MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是负数、b 是正数，那么先计算 |a| + |b| else z = x_add(a, b); // 然后对 z 取相反数 if (z != NULL) { assert(Py_SIZE(z) == 0 || Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } else { // 如果 a 是正数、b 是负数，那么计算 |a| + |b| if (Py_SIZE(b) < 0) z = x_add(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| - |b| else z = x_sub(a, b); } return (PyObject *)z;\n} 所以 long_add 和 long_sub 的代码是类似的，它们将整数的运算转成了整数的绝对值运算，所以关键要理解什么时候用 x_add，什么时候用 x_sub。 a + b 如果 a 是正数，b 是正数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数、b 是负数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数、b 是正数，调用 x_sub(b, a)，计算 |b| - |a|； 所以相加时，符号相同会调用 x_add、符号不同会调用 x_sub。 a - b 如果 a 是正数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是正数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数，b 是正数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数，b 是负数，调用 x_sub(b, a)，计算 |b| - |a|。当然在源码中调用的是 x_sub(a, b)，计算 |a| - |b|，然后再取相反数； 所以相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 接下来我们的重点就是绝对值加法和绝对值减法的具体实现细节。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法源码实现","id":"76","title":"整数加减法源码实现"},"77":{"body":"函数 x_add 负责绝对值加法，但是介绍之前，需要先了解几个宏，它们在 x_add 中会有体现。 // Include/longintrepr.h\n#define PyLong_SHIFT 30\n#define PyLong_BASE ((digit)1 << PyLong_SHIFT)\n#define PyLong_MASK ((digit)(PyLong_BASE - 1)) 显然 PyLong_BASE 等于 2 ** 30，PyLong_MASK 等于 2 ** 30 - 1（说明 32 个位，前两个位是 0，后三十个位都是 1）。 然后我们可以看 x_add 的具体实现了。 // Objects/longobject.c static PyLongObject *\nx_add(PyLongObject *a, PyLongObject *b)\n{ // 参数 a 和 b 指向了两个要相加的整数对象 // 获取整数在底层的 ob_size Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // 指向两个整数的相加结果 PyLongObject *z; // 循环变量 Py_ssize_t i; // 每个部分的运算结果 digit carry = 0; // 如果 size_a 小于 size_b，说明 |a| < |b| // 那么将两个整数交换位置，确保操作符左边的数大于右边的数 // 这么做也符合人类习惯，可以想象一下小学时候的加法计算 // 如果一个位数多，一个位数少，也会习惯将位数多的放在左边 if (size_a < size_b) { { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 申请一个 ob_digit 的长度为 size_a + 1 的 PyLongObject // 但为什么是 size_a + 1 呢? 由于上面的 if 语句，使得 size_a 一定不小于 size_b // 那么 a 和 b 相加之后的 z 的 ob_size 一定不小于 size_a // 但是也可能比 size_a 多 1，比如: a = 2 ** 60 - 1, b = 1 // 那么相加之后结果为 2 ** 60，于是 ob_size 就变成了 3 // 因此在创建 z 的时候，ob_digit 的容量会等于 size_a + 1 z = _PyLong_New(size_a+1); // 正常情况下, z 是一个 PyLongObject *，但如果 z == NULL, 表示分配失败（程序崩溃） // 但说实话, 除非你内存不够了, 否则这种情况不会发生 if (z == NULL) return NULL; // 重点来了，因为 size_a > size_b，所以会以 size_b 为准，两者从低位向高位依次对应相加 // 当 b 到头了，再单独算 a 的剩余部分 // 因此以 i < size_b 作为条件 for (i = 0; i < size_b; ++i) { // 将 a->ob_digit[i] + b->ob_digit[i] + carry（初始为 0）作为 carry // 如果 carry 没有超过 2 ** 30 - 1，那么它就是 z -> ob_digit[i] 的值 carry += a->ob_digit[i] + b->ob_digit[i]; // 但 carry 是可能溢出的，当溢出时，应该要减去 2 ** 30，所以还要判断是否产生了进位 // 但解释器没有使用常规的判断，而是选择了效率更高的位运算（carry & PyLong_MASK） // 由于 PyLong_MASK 等于 (1 << 30) - 1，所以它的前两个位是 0，后面三十个位全是 1 // 因此当 carry 不超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry // 当 carry 超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry - 2 ** 30 z->ob_digit[i] = carry & PyLong_MASK; // 然后当 carry 产生进位时，显然不可以丢，它们要作用在数组中下一个元素相加的结果上 // 所以这里将 carry 右移 30 位，得到进位，然后重新赋值给 carry，并作用在下一轮循环中 // 如果没有产生进位，那么 carry 为 0，如果产生了进位，那么 carry 为 1 carry >>= PyLong_SHIFT; } // 如果 b 到头了, 那么继续从当前的 i 开始遍历，直到 i == size_a, 逻辑还是和上面一样 for (; i < size_a; ++i) { // 此时只需要加上 a->ob_digit[i] 和 carry 即可，因为 b 到头了 carry += a->ob_digit[i]; // 这里也要按位与 PyLong_MASK, 因为也可能存在进位的情况 // 拿生活中的 99999 + 1 为例，此时 a = 99999, b = 1，显然第一次循环 b 就到头了 // 但后面单独循环 a 的时候, 依旧会产生进位，所以这里也是同理 z->ob_digit[i] = carry & PyLong_MASK; // carry 右移 30 位得到进位，然后重新赋值给 carry carry >>= PyLong_SHIFT; } // 两个循环结束之后, 其实还差一步，还拿 99999 + 1 举例子 // 按照顺序相加得到的是 00000，因为最后还进了一个 1，这里的 carry 也是同理 // 因此 z 的 ob_size 要比 size_a 多 1，目的就在于此 // 所以要将 z->ob_digit 的最后一个元素设置成 carry z->ob_digit[i] = carry; // 但如果最后的 carry 没有进位的话，显然其结果就是 0 // 所以最后没有直接返回 z，而是返回了 long_normalize(z) // 这个 long_normalize 函数的作用是从后往前依次检查 ob_digit 的元素 // 如果为 0，那么就将其 ob_size 减去 1, 直到出现一个不为 0 的元素 // 比如 ob_digit 为 [0, 3, 1, 0, 0, 0]，长度为 6，但规范化之后的 ob_size 显然是 3 // 不过对于当前来说，显然最多只会检查一次，因为它的 ob_size 只比 size_a 多 1 // 所以判断数组最后一个元素是否为 0 也可以，如果为 0 则说明没有产生进位 return long_normalize(z);\n} 整数在底层实现的很巧妙，不理解的话可以多看几遍，然后我们在 Python 的层面上再反推一下绝对值加法，进一步感受底层的运算过程。 # 假设有 a 和 b 两个整数\n# 当然这里是使用列表直接模拟底层数组 ob_digit\na = [1073741744, 999, 765, 123341]\nb = [841, 1073741633, 2332]\n# 然后创建 z，表示 a 和 b 的相加结果\nz = [] # 为了更直观，我们一步步手动相加\n# 首先是 a[0] + b[0]，得到 carry\ncarry = a[0] + b[0]\n# 但 carry 可能大于 2 ** 30 - 1，所以要进行判断\n# 如果大于，那么要减去 2 ** 30，否则保持不变\n# 而这一步可以使用位运算来实现，将 carry 和 (2 ** 30 - 1) 按位与即可\nprint(carry & (2 ** 30 - 1)) # 761\n# 结果是 761，说明 carry 比 2 ** 30 - 1 大\n# 然后 z 的第一个元素就是 761\nz.append(761) # 接着计算 a[1] + b[1] 得到新的 carry\n# 但是之前的 carry 大于 2 ** 30 - 1，所以还要再加上 carry >> 30，即进位\n# 当然，如果没有产生进位，那么 carry >> 30 就是 0\ncarry = (carry >> 30) + a[1] + b[1]\n# 然后 carry & (2 ** 30 - 1) 得到 809，说明 carry 依旧大于 2 ** 30 - 1\nprint(carry & (2 ** 30 - 1)) # 809\n# 所以 z 的第二个元素就是 809\nz.append(809) # 计算 a[2] + b[2] 的时候也是同理\ncarry = (carry >> 30) + a[2] + b[2]\n# 但显然此时的 carry 已经不大于 2 ** 30 - 1 了\nprint(carry & (2 ** 30 - 1)) # 3098\n# 说明 z 的第三个元素是 3098\nz.append(3098) # 此时 b 到头了，所以直接将 a[3] 作为 carry\n# 当然还要判断上一步的 carry 是否大于 2 ** 30 - 1\n# 所以还是右移 30 位，当不大于 2 ** 30 - 1 时，carry >> 30 就是 0\ncarry = (carry >> 30) + a[3]\nprint(carry & (2 ** 30 - 1)) # 123341\nz.append(123341) # 此时 a 也遍历完毕，但是不要忘记再对 carry 进行判断\n# 如果大于 2 ** 30 - 1，那么会产生进位，所以 z 还要再 append 一个 1\n# 当然这里 carry 没有超过 2 ** 30 - 1 # 此时 z 为 [761, 809, 3098, 123341]\nprint(z) # [761, 809, 3098, 123341] # a = [1073741744, 999, 765, 123341]\n# b = [841, 1073741633, 2332]\n# z = [761, 809, 3098, 123341]\n# 因此 ob_digit 为 [1073741744, 999, 765, 123341]\n# 和 ob_digit 为 [841, 1073741633, 2332] 的两个 PyLongObject 相加\n# 得到的新的 PyLongObject 的 ob_digit 为 [761, 809, 3098, 123341]\nprint( a[0] + a[1] * 2 ** 30 + a[2] * 2 ** 60 + a[3] * 2 ** 90 + b[0] + b[1] * 2 ** 30 + b[2] * 2 ** 60 == z[0] + z[1] * 2 ** 30 + z[2] * 2 ** 60 + z[3] * 2 ** 90\n) # True 以上就是绝对值加法，我们从源码的角度和 Python 代码的角度分别解释了一遍。看完了绝对值加法，再来看看绝对值减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值加法：x_add","id":"77","title":"绝对值加法：x_add"},"78":{"body":"和绝对值加法一样，绝对值减法也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 17。 // Objects/longobject.c static PyLongObject *\nx_sub(PyLongObject *a, PyLongObject *b)\n{ // 依旧是获取两者的 ob_size 的绝对值 Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // z 指向相加之后的 PyLongObject PyLongObject *z; // 循环变量 Py_ssize_t i; // 如果 size_a 小于 size_b，那么 sign 就是 -1，否则就是 1 int sign = 1; // 之前 carry 保存相加的结果，这里的 borrow 保存相减的结果 // 名字很形象，相加要进位叫 carry，相减要借位叫 borrow digit borrow = 0; // 接下来依旧要判断两个整数的大小，确保相减的时候，绝对值大的一方在左边 // 相加的时候，大的一方在左边还是在右边，其实没太大影响 // 而相减的时候如果大的一方在左边，显然会省事很多 // 所以如果 size_a 比 size_b 小，说明 a 的绝对值比 b 小 if (size_a < size_b) { // 那么令 sign = -1，因为 a 和 b 交换了位置，所以后续相减之后还要再乘上 sign // 因为计算的是绝对值之差，符号是在绝对值之差计算完毕之后通过 sign 判断的 sign = -1; // 交换 a 和 b 的位置 { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 如果 size_a == size_b，那么需要依次比较 ob_digit 里的元素，才能判断出大小 else if (size_a == size_b) { // 所以从 ob_digit 的尾部开始遍历 i = size_a; while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果所有元素都相等，那么 i 会等于 -1，相减的结果为 0，此时直接返回 0 即可 // 所以这一步也是为了能够快速返回结果，而额外做的一层判断 if (i < 0) return (PyLongObject *)PyLong_FromLong(0); // 但如果某个对应的元素不相等，那么只需判断这两者谁大谁小即可 // 假设 a 的 ob_digit 是 [2, 3, 4, 5]，b 的 ob_digit 是 [1, 2, 4, 5] // 那么上面的 while 循环结束之后，i 会等于 1，显然只需要判断索引为 1 时，对应的值谁大谁小即可 if (a->ob_digit[i] < b->ob_digit[i]) { // 如果 a->ob_digit[i] < b->ob_digit[i]，同样说明 a 小于 b // 那么将 sign 设置为 -1，并交换 a 和 b 的位置 sign = -1; { PyLongObject *temp = a; a = b; b = temp; } } // 因为高位在减法的时候会被抵消掉，所以将 size_a 和 size_b 设置成 i + 1 即可 // 假设两个整数的 ob_digit 分别是 [2, 3, 4, 5] 和 [1, 2, 4, 5] // 因为后两个元素是一样的，所以后续只需要对索引为 [0: i+1] 的部分做差即可 size_a = size_b = i+1; } // a 和 b 相减之后，结果一定不超过 a，因此 ob_digit 的长度一定小于等于 size_a z = _PyLong_New(size_a); if (z == NULL) return NULL; // 然后下面的逻辑和 x_add 是类似的 for (i = 0; i < size_b; ++i) { // 让 a 的 ob_digit[i] 减去 b 的 ob_digit[i] // 当然，由于上一个元素在相减的时候，可能会向当前元素借位，因此还要再减去 borrow // 如果没借位，那么 borrow 是 0，如果借位了，那么 borrow 是 1 // 然后如果当前元素相减的结果也小于 0，那么继续向下一个元素借位 // 但我们似乎没有看到借位的逻辑，这是因为 digit 是无符号 32 位整型，负数会发生环绕 // 假设这里相减得到的是 -100，那么结果就是 2 ** 32 - 100 // 所以存储的负数会变成 \"2 ** 32 + 该负数\"，相当于自动向数组的下一个元素借了一位 // 但 digit 只用 30 个位，所以借一位之后应该加上 2 ** 30，而目前加的是 2 ** 32 borrow = a->ob_digit[i] - b->ob_digit[i] - borrow; // 所以还要和 PyLong_MASK 按位与，只保留后 30 个位的值 // 当然如果没有产生借位，borrow & PyLong_MASK 的结果还是 borrow z->ob_digit[i] = borrow & PyLong_MASK; // 如果借位了，下一轮循环的时候，肯定要多减个 1，但问题是怎么判断有没有借位呢？ // 很简单，如果没有借位，borrow 一定小于 2 ** 30，第 31 个位一定是 0 // 如果借位了，那么 borrow 一定大于 2 ** 30，第 31 个位一定是 1 // 所以让 borrow 右移 30 个位 borrow >>= PyLong_SHIFT; // 然后和 1 按位与，如果产生了借位，borrow 就是 1，否则就是 0 // 等到下一轮循环的时候，再减去 borrow borrow &= 1; /* 所以 Python 底层的整数只用 30 个位真的非常巧妙，尤其是在减法的时候 由于 digit 是 32 位，借位时会加上 2 ** 32 但底层只用 30 个位，所以再和 PyLong_MASK 按位与，只保留后 30 个位 而当前元素如果借位了，那么数组下一个元素要减去 1，但怎么判断它有没有借位呢？ 首先两个不超过 2 ** 30 - 1 的数，相减的结果如果为正（没产生借位） 那么一定也不会超过 2 ** 30 - 1，换句话说其结果对应的第 31 位一定是 0 但如果两个整数相减的结果为负，那么会自动加上 2 ** 32，因此第 31 位一定是 1 所以再让 borrow 右移 30 位，并和 1 按位与 如果结果为 1，证明相减为负数，确实向下一个元素借了 1，因此下一次循环时会多减一个 1 如果结果为 0，那么说明没有借位，下一次循环时相当于多减了一个 0 */ } // 如果 size_a 和 size_b 不相等，那么还需要继续处理 a 的 ob_digit 剩余的元素 for (; i < size_a; ++i) { // 这里的逻辑和之前分析 x_add 是类似的 borrow = a->ob_digit[i] - borrow; z->ob_digit[i] = borrow & PyLong_MASK; borrow >>= PyLong_SHIFT; borrow &= 1; } // 只不过由于不会产生进位，因此不需要再对 borrow 做额外判断 // 而 x_add 中最后还要判断 carry 有没有进位 assert(borrow == 0); // 如果 sign < 0，那么证明是负数，因此还要改变 z 的符号 if (sign < 0) { Py_SIZE(z) = -Py_SIZE(z); } // 最后同样要将 z 规范化，将高位的 0 忽略掉 // 比如 100000 - 99999，结果是 000001，显然只需要保留最低位的 1 即可 // 另外如果相减的结果是小整数，那么直接从池子里获取，否则返回新创建的 return long_normalize(z);\n} 同样的，关于绝对值减法，我们也用 Python 代码演示一遍，感受底层的运算过程。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]，所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 注：源码中加的是 2 ** 32，所以之后还要和 PyLong_MASK 按位与\n# 因此 a[0] + 2 ** 30 - b[0] 等价于 (a[0] + 2 ** 32 - b[0]) & (2 ** 30 - 1) # 然后是 a[1] - b[1]，由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 以上就是绝对值减法，设计的非常巧妙，可以多看几遍，并用列表模拟 ob_digit 数组，然后实际测试一下。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值减法：x_sub","id":"78","title":"绝对值减法：x_sub"},"79":{"body":"关于整数的内容，我们就介绍完了。回顾一下，首先我们剖析了整数的底层实现，了解了它不会溢出的奥秘，然后又介绍了小整数对象池。但也正如之前所说，使用数组实现大整数并不是什么特别新颖的思路，它的难点在于数学运算，这是非常考验编程技巧的地方。 而我们这里只是分析了加减法，至于乘除则更加复杂，这里就不再分析了。关于乘法，解释器采用的是效率更高的 karatsuba 算法，比较有意思，有兴趣可以自己查看一下。 综上所述不难发现 Python 效率低的原因，毕竟一个简单的整数运算都要做这么多工作。当然了，解释器内部也定义了很多快分支，会提前检测能否使用快速通道进行处理，当无法使用快速通道时，再走通用逻辑。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 小结","id":"79","title":"小结"},"8":{"body":"以上我们就聊了聊 Python 的变量和对象，核心就在于：变量保存的不是对象本身，而是对象的内存地址，站在 C 的角度上看变量就是一个指针。 尽管 Python 一切皆对象，但你拿到的都是对象的指针，变量是一个指针，函数是一个指针，元组、列表、字典里面存储的还是指针。我们可以想象一下列表，它底层是基于数组实现的，由于 C 数组要求里面每个元素的类型和大小都相同，因此从这个角度上讲，列表内部存储的只能是指针。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 小结","id":"8","title":"小结"},"80":{"body":"本篇文章来聊一聊布尔值是怎么实现的，在 Python 里面 True 和 False 虽然是关键字，但它们其实也是对象。 下面我们就来详细地解释一下。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 楔子","id":"80","title":"楔子"},"81":{"body":"先来说一下布尔类型本身，我们知道 bool 继承自 int，所以 True 和 False 也具备整数的特征。 print(bool.__base__) # <class 'int'>\nprint(isinstance(True, bool)) # True # True 和 False 可以当成 1 和 0 来用\nprint(True * 2) # 2\nprint(3 // 3 == True) # True\nprint(sum([True, 1, 2])) # 4\nprint(False + 1) # 1 bool 在底层对应 PyBool_Type，因此我们可以肯定地讲，PyBool_Type 的 tp_base 字段的值一定是 &PyLong_Type。 // Objects/boolobject.c\nPyTypeObject PyBool_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bool\", sizeof(struct _longobject), 0, 0, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ bool_repr, /* tp_repr */ &bool_as_number, /* tp_as_number */ // ... &PyLong_Type, /* tp_base */ // ...\n}; bool 继承 int，所以它也实现了 tp_as_number。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔类型","id":"81","title":"布尔类型"},"82":{"body":"既然 bool 继承 int，那么布尔值和整数的底层结构是一样的。 // Objects/boolobject.c // PyLongObject 是 struct _longobject 的类型别名\nstruct _longobject _Py_FalseStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 0) { 0 }\n}; struct _longobject _Py_TrueStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 1) { 1 }\n}; 我们看到布尔值在底层是静态定义好的 PyLongObject 结构体实例，ob_digit 分别为 [0] 和 [1]，所以 False 和 True 完全可以当成 0 和 1 来用。当然啦，由于变量都是 PyObject *，所以这两个结构体实例一般不直接用，而是用底层提供的两个宏。 // Include/boolobject.h /* Use these macros */\n#define Py_False ((PyObject *) &_Py_FalseStruct)\n#define Py_True ((PyObject *) &_Py_TrueStruct) 当返回 Python 的 True 和 False 时，底层会返回 Py_True 和 Py_False，也就是转成 PyObject * 之后再返回。为此解释器还提供了两个宏。 // Include/boolobject.h #define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True\n#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False 当然这些应该比较简单了。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的底层结构","id":"82","title":"布尔值的底层结构"},"83":{"body":"创建布尔值有两种方式，一种是基于 C 整数创建，另一种是将 Python 对象转成布尔值。 基于 C 整数创建，会通过 PyBool_FromLong 函数，显然它是布尔对象的特定类型 API。 // Objects/boolobject.c PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 这个特定类型 API 一般都是解释器内部使用，或者编写扩展的时候使用。而除了这种方式，我们还可以调用 bool 类型，将对象转成布尔值。 // Objects/boolobject.c // 基于 Python 对象创建，比如 bool(obj)\n// 显然会调用 PyBool_Type 的 tp_new，在底层该字段被赋值为 bool_new\ntatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 保存接收的参数，先设置为 False PyObject *x = Py_False; long ok; // bool 类型不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 最多接收 1 个位置参数，解析出来赋值给 x // 如果不传位置参数，那么 x 就是上面设置的 Py_False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 Pyobject_Islrue 判断 x 是真是假 // 如果为真返回 1，否则返回 0 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 将整数转成布尔值 return PyBool_FromLong(ok);\n} 所以核心就在 PyObject_IsTrue 函数里面，看一下它的内部逻辑。 // Objects/object.c\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身是布尔值 True，那么返回 1 if (v == Py_True) return 1; // 如果 v 本身是布尔值 False，那么返回 0 if (v == Py_False) return 0; // 如果 v 是 None，那么返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且它的类型对象定义了 __bool__，那么调用 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且它的类型对象定义了 __len__，那么调用 // 说白了就是基于内部的键值对个数进行判断 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且它的类型对象定义了 __len__，那么调用 // 也就是基于内部的元素个数进行判断 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 否则默认为真，比如我们自定义类的实例 else return 1; // 如果 res 大于 0，返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} 当 PyObject_IsTrue 调用完之后，再基于 PyBool_FromLong 创建布尔值即可，我们用 Python 代码演示一下。 # 不传参数，默认返回 False\nprint(bool()) # False # 整数实现了 __bool__，所以 bool(1) 会调用 int.__bool__(1)\nprint(bool(1)) # True # 字符串实现了 __len__，所以 bool(\"abc\") 会调用 str.__len__(\"abc\")\nprint(bool(\"abc\")) # True class A: pass # 自定义类没有实现 __bool__、__len__\n# 所以在 PyObject_IsTrue 里面最终会走 else 分支，直接为真\nprint(bool(A())) # True # 但如果定义了 __len__，那么是否为真取决于 __len__ 的返回值\n# 并且 __len__ 要定义在类型对象里面，因为 a.__len__() 其实只是语法糖\n# 底层真正执行的是 A.__len__(a)，关于这部分细节后续介绍类的时候会细说\ntype.__setattr__(A, \"__len__\", lambda self: 0)\n# 因为 __len__ 返回的是 0，所以为假，注意：__len__ 要返回整数\nprint(bool(A())) # False # 如果再实现一个 __bool__ 呢？\ntype.__setattr__(A, \"__bool__\", lambda self: True)\n# 我们发现结果又变成了 True，因为 __bool__ 返回的是 True（必须返回布尔值）\n# 并且在源码中，__bool__ 查找的优先级高于 __len__\nprint(bool(A())) # True 现在你是不是对布尔值有一个更深的印象了呢？一个简单的布尔值，居然有这么多可说的。 但是还没结束，我们还要补充一个知识点，先看一段代码。 name = \"satori\" if name: pass if bool(name): pass 这两个 if 判断有啥区别呢？首先 if bool(name) 我们已经分析过了，它会执行 bool_new 函数，将参数解析出来，接着再调用 PyObject_IsTrue，最后得到布尔值。 而对于 if name 来说，它会直接调用 PyObject_IsTrue，后续在分析 if 语句的时候会介绍。所以在工作中，我们使用 if name 即可。 当然啦，获取布尔值除了 bool(obj) 之外，还可以使用 not not obj。 name = \"satori\" print(bool(name)) # True\nprint(not not name) # True 这两者又有什么区别呢？首先 bool(name) 在 Python 里面是一个调用，会进行参数解析，拿到对象之后调用 PyObject_IsTrue 判断真假，正常执行的话，会返回 1 或 0。然后基于 1 和 0 创建布尔值，为 1 返回 True，为 0 返回 False。 而 not name 会对应一条 UNARY_NOT 字节码，它内部也会调用 PyObject_IsTrue，如果结果为 1 返回 False，为 0 返回 True，正好是相反的。所以 not not name 则相当于在 not name 的基础上再反过来一次，这样就和 bool(name) 的结果是一致的了。 当然在工作中，使用哪种都可以，看自己喜好。但为了代码的可读性，显式获取布尔值的时候还是建议使用 bool(name)，效率上没太大差别。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的创建","id":"83","title":"布尔值的创建"},"84":{"body":"以上就是布尔值相关的内容。 bool 继承 int，并且布尔值在底层和整数使用同一个结构体，只是 ob_type 不同； 布尔值具备整数的所有特征，可以像整数一样参与各种运算，其中 True 会被解释成 1，False 会被解释成 0； 布尔值有两种，分别是 True 和 False，它们是单例的，判断时应该使用 is，而不是 ==，除非你把 True 和 False 当成整数使用； 在 Python 里面如果要创建布尔值，有三种方式：通过 True 和 False 字面量、调用类型对象 bool、使用 not not； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 小结","id":"84","title":"小结"},"85":{"body":"None 在 Python 里面也是一个对象，用于表示空（值不存在的情况）。比如基于主键从数据库获取记录，如果没有查询到，那么一般会返回 None。另外如果函数没有返回值，那么也会隐式地返回 None，表示返回的是空。 本篇文章就来聊一聊 None 是怎么实现的。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 楔子","id":"85","title":"楔子"},"86":{"body":"和其它对象不同，由于 None 没有额外的实体数据，所以它在底层就是一个 PyObject 结构体实例。因此也能看出，None 的大小为 16 字节。 // Objects/object.c\nPyObject _Py_NoneStruct = { _PyObject_EXTRA_INIT 1, &_PyNone_Type\n}; None 在底层只包含引用计数和类型，然后类型为 _PyNone_Type。由于变量都是 PyObject *，所以和布尔值一样，解释器也提供了相应的宏，从而方便使用。 // Include/object.h\n#define Py_None (&_Py_NoneStruct) 注意：None 是单例的，如果要判断对象是否为空，应该使用 is 关键字。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的底层结构","id":"86","title":"None 的底层结构"},"87":{"body":"说完了 None 本身，再来看看它的类型。 print(type(None)) # <class 'NoneType'> None 的类型是 <class 'NoneType'>，但这个类解释器没有暴露给我们，需要通过 type 去获取。注意：NoneType 无法被继承，当然我们一般也不会去继承它。 class MyType(type(None)): pass\n\"\"\"\nTypeError: type 'NoneType' is not an acceptable base type\n\"\"\" 然后看一下 NoneType 的底层结构，它位于 Objects/object.c 中。 PyTypeObject _PyNone_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"NoneType\", 0, 0, none_dealloc, /*tp_dealloc*/ /*never called*/ 0, /*tp_vectorcall_offset*/ 0, /*tp_getattr*/ 0, /*tp_setattr*/ 0, /*tp_as_async*/ none_repr, /*tp_repr*/ &none_as_number, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ 0, /*tp_hash */ 0, /*tp_call */ 0, /*tp_str */ 0, /*tp_getattro */ 0, /*tp_setattro */ 0, /*tp_as_buffer */ Py_TPFLAGS_DEFAULT, /*tp_flags */ 0, /*tp_doc */ 0, /*tp_traverse */ 0, /*tp_clear */ 0, /*tp_richcompare */ 0, /*tp_weaklistoffset */ 0, /*tp_iter */ 0, /*tp_iternext */ 0, /*tp_methods */ 0, /*tp_members */ 0, /*tp_getset */ 0, /*tp_base */ 0, /*tp_dict */ 0, /*tp_descr_get */ 0, /*tp_descr_set */ 0, /*tp_dictoffset */ 0, /*tp_init */ 0, /*tp_alloc */ none_new, /*tp_new */\n}; NoneType 的类型也是 type，然后它实现了 tp_as_number。 // Objects/object.c\nstatic PyNumberMethods none_as_number = { // ... (inquiry)none_bool, /* nb_bool */ // ...\n} 但是只实现了里面的 nb_bool，用于生成布尔值。 // Objects/object.c\nstatic int\nnone_bool(PyObject *v)\n{ return 0;\n} 函数返回的是 0，因此调用 PyBool_FromLong 的时候，会返回 Py_False。 print(bool(None)) # False\nprint(not not None) # False","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的类型","id":"87","title":"None 的类型"},"88":{"body":"以上我们就简单介绍了 None，当然内容有些过于简单了，因为 None 本身就没多少内容，核心就两点： None 是单例的； 判断的时候使用 is 关键字； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 小结","id":"88","title":"小结"},"89":{"body":"本篇文章来探讨一下切片是如何实现的，因为在操作字符串、元组、列表等数据结构时，我们经常会使用切片截取数据，所以对切片做一个全方位的了解是很有必要的。 data = list(range(10))\nprint(data[1: 8: 3]) # [1, 4, 7] 以上就是基于切片截取数据，在工作中我们会大量使用切片。但你知道吗，其实切片也是一个对象，类型为 slice，下面我们来看一下切片的底层结构。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 楔子","id":"89","title":"楔子"},"9":{"body":"在程序开发中，我们每时每刻都在创建对象，那到底什么是对象呢？ 其实一个对象就是一片被分配的内存空间，空间可以是连续的，也可以是不连续的。然后空间里面存储了指定的数据，并提供了操作数据的一些功能方法。而按照是否可变和内存大小是否固定，我们可以将对象进行如下分类。 可变对象和不可变对象； 定长对象和变长对象； 下面来详细解释一下。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 楔子","id":"9","title":"楔子"},"90":{"body":"切片的类型是 slice，那么根据解释器的 API 命名规则，我们猜测： 切片（slice 对象）在底层对应 PySliceObject 结构体实例； slice 类型本身在底层对应 PySlice_Type； 下面看一下具体实现。 // Include/sliceobject.h\ntypedef struct { PyObject_HEAD PyObject *start, *stop, *step;\n} PySliceObject; 切片是不可变对象，除了对象的公共头部之外，还有三个字段，分别表示切片的起始位置、终止位置、步长。这也意味着创建切片时，可以给 slice 传递三个参数。 # 创建一个切片\ns = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3) 问题来了，切片创建的时候，传递的参数绑定在了哪些属性上呢？前面我们说过，实例对象可以绑定哪些属性，会定义在类型对象的 tp_members 字段中。 我们看到切片拥有三个属性，名称也是 start、stop、step。 s = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3)\nprint(s.start) # 1\nprint(s.stop) # 8\nprint(s.step) # 3 非常简单，你在 Python 里面看到的一切，都能从源码中找到答案。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的底层结构","id":"90","title":"切片的底层结构"},"91":{"body":"切片是内置类型的实例对象，对于这样的对象，有两种创建方式，相信你已经知道我要说什么了。我们在最开始专门用了十篇文章，从宏观的角度介绍了 Python 的对象模型，目的就在于此。 创建内置对象的两种方式： 通过对象的特定类型 API 创建，只适用于内置对象； 通过调用类型对象创建，所有对象都适用； 解释器对内置对象了如指掌，它们对应的结构体在源码中是写死的，直接 sizeof 一下即可知晓要申请多大内存，完全不需要借助类型对象。 data = list(range(10))\n# 通过特定类型 API 创建\nprint(data[1: 8: 3]) # [1，4，7]\n# 通过调用类型对象创建\nprint(data[slice(1, 8, 3)]) # [1，4，7] 解释器看到 data[1: 8: 3] 就知道要创建一个切片，并且是在数据截取的过程中创建的，我们不能单独写一个 1: 8: 3，这是不符合语法规则的。如果真的想单独创建一个切片，那么需要通过 slice(1, 8, 3) 的方式。 下面通过源码，看一下底层的创建过程。 // Objects/sliceobject.c\nstatic PyObject *\nslice_new(PyTypeObject *type, PyObject *args, PyObject *kw)\n{ PyObject *start, *stop, *step; start = stop = step = NULL; // slice 不接收关键字参数，因此 kw 要指向空字典 if (!_PyArg_NoKeywords(\"slice\", kw)) return NULL; // slice 接收 1 ~ 3 个位置参数，因此 args 指向的元组必须包含 1 ~ 3 个元素 // 然后解析 args，将内部的元素分别赋值给 start、stop、step if (!PyArg_UnpackTuple(args, \"slice\", 1, 3, &start, &stop, &step)) return NULL; // 如果 stop == NULL，说明只传递了一个参数，按照顺序这个参数会赋值给 start // 但很明显，如果只有一个参数，那么这个参数应该交给 stop 保存 // 于是让 stop = start，并让 start = NULL，至于这么做的原因可以想象一下 range // 如果是 range(0, 9)，那么起始位置和终止位置就是 0 和 9 // 但如果是 range(9)，那么这个 9 就是终止位置 if (stop == NULL) { stop = start; start = NULL; } // 假设传了一个参数 8，那么这里就是 PySlice_New(NULL, 8, NULL) // 假设传了两个参数 1、8，那么这里就是 PySlice_New(1, 8, NULL) // 假设传了三个参数 1、8、3，那么这里就是 PySlice_New(1, 8, 3) return PySlice_New(start, stop, step);\n} // 切片缓存，注：slice_cache 只能缓存一个切片\nstatic PySliceObject *slice_cache = NULL; PyObject *\nPySlice_New(PyObject *start, PyObject *stop, PyObject *step)\n{ PySliceObject *obj; // 如果 slice_cache 不为 NULL，证明缓存了切片，那么赋值给 obj // 由于 slice_cache 只能缓存一个切片，那么赋值给 obj 之后，自身要重置为 NULL if (slice_cache != NULL) { obj = slice_cache; slice_cache = NULL; _Py_NewReference((PyObject *)obj); } else { // 否则调用 PyObject_GC_New 为 PySliceObject 实例申请内存 obj = PyObject_GC_New(PySliceObject, &PySlice_Type); if (obj == NULL) return NULL; } // 如果 start、stop、step 是 NULL，那么转成 Python 的 None if (step == NULL) step = Py_None; Py_INCREF(step); if (start == NULL) start = Py_None; Py_INCREF(start); if (stop == NULL) stop = Py_None; Py_INCREF(stop); // 设置切片的 start、stop、step 属性 obj->step = step; obj->start = start; obj->stop = stop; // 接收 GC 跟踪（在之后的篇章中会解释） _PyObject_GC_TRACK(obj); // 转成泛型指针之后返回 return (PyObject *) obj;\n} 以上就是切片的创建过程，非常简单，我们用 Python 代码演示一遍。 print(slice(8)) # slice(None, 8, None)\nprint(slice(1, 8)) # slice(1, 8, None)\nprint(slice(1, 8, 3)) # slice(1, 8, 3) 结果和源码是一致的。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片是怎么创建的","id":"91","title":"切片是怎么创建的"},"92":{"body":"从源码中可以看到，切片是有缓存的。 static PySliceObject *slice_cache = NULL; 这个字段用于缓存被回收的切片，并且从切片的创建过程可以看出只会缓存一个，而不是像浮点数那样以链表的形式缓存多个。之所以这么做，是因为在大部分情况下，切片用完之后会立即销毁。 data = list(range(10))\n# 创建一个切片，截取完数据之后就销毁\nprint(data[0: 3]) # [0, 1, 2]\n# 创建一个切片，截取完数据之后就销毁\nprint(data[2: 7]) # [2, 3, 4, 5, 6] 像 data[start: stop: step] 这种形式，当数据截取完毕之后，创建的切片会立即回收，所以对于解释器来说，它只需要缓存一个切片即可。因此你可以认为同一时刻只会存在一个有效切片，那什么时候会存在多个呢？ data = list(range(10))\ns1 = slice(0, 3)\ns2 = slice(2, 7)\nprint(data[s1]) # [0, 1, 2]\nprint(data[s2]) # [2, 3, 4, 5, 6] 在这种情况下，会同时存在多个有效切片，比如 s1 和 s2 都指向了有效的切片。但很明显，我们在工作中不会这么做，而是在截取数据时，让解释器通过切片的特定类型 API 自动创建。 下面我们来打印切片的地址，看看切片是否被缓存起来了。 # 创建一个切片，缓存如果存在，从缓存获取，否则创建新的切片\n>>> s1 = slice(0, 3)\n>>> id(s1)\n140190801666944 # 创建切片，因为 s1 和 s2 是两个独立的切片，所以它们的地址是不一样的\n>>> s2 = slice(2, 7)\n>>> id(s2)\n140190800965120 # 删除 s1，那么它指向的切片会被放到缓存中\n>>> del s1 # 创建新的切片，使用缓存，显然它的地址和之前 s1 指向的切片的地址是一样的\n>>> s3 = slice(1, 5)\n>>> id(s3)\n140190801666944 # 由于缓存为空，那么删除 s2，它指向的切片会被放入缓存\n>>> del s2 # 创建新的切片，显然它的地址和之前 s2 指向的切片的地址是一样的\n>>> s4 = slice(1, 6)\n>>> id(s4)\n140190800965120 打印结果表明，切片是会被缓存的，但我们怎么证明切片只会缓存一个呢？这个直接看源码即可，根据之前的经验，对象被放入缓存这一步一定发生在对象被销毁的时候，所以我们只需要看切片的销毁过程即可。 对象被销毁时，会调用类型对象的 tp_dealloc，也就是析构函数。 类型对象的 tp_basicsize 保存了实例对象的基础大小，对于切片而言就是 sizeof(PySliceObject)，然后切片又是定长对象，因此 tp_itemsize 是 0。所以切片的大小是固定的，PyObject 占 16 字节，start、end、step 各占 8 字节，总共 40 字节，因此任何一个切片的大小都是固定的 40 字节。 而这个大小即使不借助类型对象也可以计算出来，因为内置对象的定义都是写死的，解释器对它们了如指掌。 为了唤醒大家的记忆，加深理解，以前的内容会时不时回顾一下。我们继续看切片的销毁，对应的析构函数是 slice_dealloc。 // Objects/sliceobject.c\nstatic void\nslice_dealloc(PySliceObject *r)\n{ // 取消 GC 跟踪，相关内容后续介绍 _PyObject_GC_UNTRACK(r); // 切片销毁时，减少 start、stop、step 指向对象的引用计数 Py_DECREF(r->step); Py_DECREF(r->start); Py_DECREF(r->stop); // 关键来了，如果 slice_cache 为 NULL，证明没有缓存 // 那么让 slice_cache 保存销毁的切片的指针，而切片的内存不释放 // 这样下一次创建切片时就不需要申请内存了，直接使用缓存即可 // 因为没有申请内存，只是初始化了 start、stop、step 三个字段，所以效率会更高 if (slice_cache == NULL) slice_cache = r; // 否则释放切片所占的内存 else PyObject_GC_Del(r);\n} 从源码中可以看到，如果 slice_cache 不为空，说明已经缓存了一个切片，if 条件不成立，于是会选择释放内存，所以切片只会缓存一个。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的缓存","id":"92","title":"切片的缓存"},"93":{"body":"切片接收 1 到 3 个元素，但我们可能只传一个，那么剩余的属性是怎么初始化的呢？举个例子： >>> data = list(range(10))\n>>> data[: 5]\n[0, 1, 2, 3, 4]\n>>> data[1:]\n[1, 2, 3, 4, 5, 6, 7, 8, 9]\n>>> data[1:: 2]\n[1, 3, 5, 7, 9]\n>>> data[:: 2]\n[0, 2, 4, 6, 8]\n>>> data[:]\n[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 这些切片都是合法的，当参数不足时，它们的 start、end、step 是怎么设置的呢？ // Objects/sliceobject.c // 该函数接收指向切片的指针，以及三个整型指针\n// 会将切片的起始位置、终止位置、步长解析出来，赋值给 *start、*stop、*step\n// 所以该函数会在其它函数的内部被调用，先声明 Py_ssize_t start, stop, step\n// 然后将切片指针、&start、&stop、&end 传递给 PySlice_Unpack 进行调用\n// 当该函数执行完毕时，外部就拿到了切片的起始位置、终止位置以及步长\nint\nPySlice_Unpack(PyObject *_r, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)\n{ // 将 PyObject * 转成 PySliceObject * PySliceObject *r = (PySliceObject*)_r; Py_BUILD_ASSERT(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX); // 判断步长，如果解析出的步长为空，那么将 *step 赋值为 1 // 所以当不指定步长时，步长会被设置为 1，因此 data[::] 等价于 data[:: 1] if (r->step == Py_None) { *step = 1; } else { // 如果步长不为空，那么它应该是整数，或者是实现了 __index__ 的类的实例对象 // 但如果步长的类型不合法，那么 _PyEval_SliceIndex 里面会设置异常 // 合法的话，会将 r->step 赋值给 *step if (!_PyEval_SliceIndex(r->step, step)) return -1; // 步长不能为 0，否则设置 ValueError(\"slice step cannot be zero\") if (*step == 0) { PyErr_SetString(PyExc_ValueError, \"slice step cannot be zero\"); return -1; } // 如果步长小于 -PY_SSIZE_T_MAX，那么设置为 -PY_SSIZE_T_MAX // 显然这一步基本不会发生 if (*step < -PY_SSIZE_T_MAX) *step = -PY_SSIZE_T_MAX; } // 检测起始位置，如果为 None // 当步长大于 0 时，将 *start 设置为 0 // 当步长小于 0 时，将 *start 设置为 int64 最大值，这背后的原理一会儿解释 if (r->start == Py_None) { *start = *step < 0 ? PY_SSIZE_T_MAX : 0; } // 说明起始位置不为 None else { // 如果起始位置的类型不合法，那么设置异常，直接返回，否则赋值给 *start if (!_PyEval_SliceIndex(r->start, start)) return -1; } // 如果终止位置为 None // 当步长大于 0 时，将 *stop 设置为 PY_SSIZE_T_MAX，即 int64 最大值 // 当步长小于 0 时，将 *stop 设置为 PY_SSIZE_T_MIN，即 int64 最小值 if (r->stop == Py_None) { *stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX; } // 说明终止位置不为 None else { // 如果终止位置不合法，那么设置异常，直接返回，否则赋值给 *stop if (!_PyEval_SliceIndex(r->stop, stop)) return -1; } return 0;\n} 代码逻辑有一些绕，虽然我们知道它在做什么，但问题是这么做的意义是什么呢？在解释之前，我们先用 Python 代码将该函数所做的事情再描述一遍，这样更容易理解。 PY_SSIZE_T_MAX = 2 ** 63 - 1\nPY_SSIZE_T_MIN = -2 ** 63 # 如果切片同时包含起始位置、终止位置、步长，会直接赋值给 start、end、step\n# 这种情况最简单，就不赘述了，我们来讨论未被同时指定的情况 # 步长为空，比如 data[1: 8]\nstart = 1\nend = 8\nstep = 1 # 起始位置为空，步长大于 0，比如 data[: 8]\nstart = 0\nend = 8\nstep = 1\n# 起始位置为空，步长小于 0，比如 data[: 8: -1]\nstart = PY_SSIZE_T_MAX\nend = 8\nstep = -1 # 终止位置为空，步长大于 0，比如 data[2:]\nstart = 2\nend = PY_SSIZE_T_MAX\nstep = 1\n# 终止位置为空，步长小于 0，比如 data[2:: -1]\nstart = 2\nend = PY_SSIZE_T_MIN\nstep = -1 # 起始位置、终止位置均为空，步长大于 0，比如 data[::]\nstart = 0\nend = PY_SSIZE_T_MAX\nstep = 1\n# 起始位置、终止位置均为空，步长小于 0，比如 data[:: -1]\nstart = PY_SSIZE_T_MAX\nend = PY_SSIZE_T_MIN\nstep = -1 下面来分析一下它为什么要这么做，首先我们要知道，所谓的切片截取数据，本质上就是一层 for 循环。 def slice_data(data: list, start: int, end: int, step: int) -> list: ret_data = [] assert step != 0 if step > 0: while start < end and start < len(data): ret_data.append(data[start]) start += step else: while start > end and start >= 0: ret_data.append(data[start]) start -= step * -1 return ret_data data = list(range(0, 10))\nprint(data[: 5])\nprint(slice_data(data, 0, 5, 1))\n\"\"\"\n[0, 1, 2, 3, 4]\n[0, 1, 2, 3, 4]\n\"\"\"\nprint(data[8: 3: -1])\nprint(slice_data(data, 8, 3, -1))\n\"\"\"\n[8, 7, 6, 5, 4]\n[8, 7, 6, 5, 4]\n\"\"\" 所以当步长大于 0 时，从左往右遍历，当步长小于 0 时，从右往左遍历。最后我们再画两张图，看完之后你就彻底理解了。 当步长大于 0 时： 步长大于 0 时，从左往右遍历。 如果 start 未指定，那么设置为 0，表示从头截取，这很好理解，但问题是 end 应该设置为多少。由于 PySlice_Unpack 相当于只是做了一步预处理，它并不包含截取的原始数据的信息，所以 end 如果不指定，直接设置为 int64 最大值。 当步长小于 0 时： 当步长小于 0 时，从右往左遍历。 因为不知道截取的原始数据有多长，所以如果 start 未指定，那么设置为 int64 最大值。但不管是从左往右还是从右往左，end 都是不包含的，所以当 end 为空时，不能指定为 0，否则索引为 0 的元素就取不到了。当然也不能设置为 -1，因为 -1 会被当成是合法的负数索引，后续截取数据时会被解释为最后一个元素的索引，所以它被设置成了 int64 最小值。 我们以使用切片截取列表为例，后续介绍列表的时候还会详细说： 代码中的 item 指向切片，截取数据之前要先获取它内部的 start、stop、step 属性，于是创建三个 Py_ssize_t 变量，并将指针作为参数，调用 PySlice_Unpack。当调用结束后，就拿到了切片的起始位置、终止位置、步长。 但还没有结束，我们说 PySlice_Unpack 只是对切片里面的值做了一些预处理，比如当 step 为 1 并且 end 没有指定时，那么 end 会被设置为 PY_SSIZE_T_MAX。 所以它下面又调用了函数 PySlice_AdjustIndices，会将截取的原始数据的长度也传进去，然后对 start、end、step 做进一步处理，所有的序列对象在基于切片截取数据时都会有这两步。我们看一下该函数的逻辑。 // Objects/sliceobject.c\nPy_ssize_t\nPySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)\n{ // 参数 length：截取的原始数据的长度 // 参数 start、stop：指向起始位置和终止位置的指针 // 参数 step：步长 assert(step != 0); assert(step >= -PY_SSIZE_T_MAX); // 如果起始位置小于 0 if (*start < 0) { // 那么加上长度，得到正数索引，因为负数索引就是个语法糖 *start += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *start < 0 时， 直接将 *start 设置为 0，最终会从第一个元素开始往后遍历 如果 step < 0，表示从后往前遍历，因此当 *start < 0 时， 显然遍历不到任何元素，因为索引是大于 0 的，所以直接将 *start 设置为 -1 */ if (*start < 0) { *start = (step < 0) ? -1 : 0; } } // 如果起始位置大于等于长度，继续判断步长 else if (*start >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *start >= length 时， 显然遍历不到任何元素，因为最大索引为 length - 1 所以直接将 *start 设置为 length 如果 step < 0，表示从后往前遍历，因此当 *start >= length 时， 直接将 *start 设置为 length - 1，最终会从最后一个元素往前遍历 */ *start = (step < 0) ? length - 1 : length; } // 如果终止位置小于 0 if (*stop < 0) { // 那么加上长度，得到正数索引 *stop += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *stop < 0 时， 显然遍历不到任何元素，因此直接将 *stop 设置为 0 如果 step < 0，表示从后往前遍历，因此当 *stop < 0 时， 直接将 *stop 设置为 -1，最终会从后往前遍历到头 */ if (*stop < 0) { *stop = (step < 0) ? -1 : 0; } } // 如果终止位置大于等于长度，继续判断步长 else if (*stop >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *stop >= length 时， 直接设置为 length，会从 start 往后遍历到头 如果 step < 0，表示从后往前遍历，因此当 *stop >= length 时， 此时遍历不到任何元素，直接设置为 length - 1 */ *stop = (step < 0) ? length - 1 : length; } // 到这里 *start、*stop 就已经转换好了 // 或者说 PY_SSIZE_T_MIN、PY_SSIZE_T_MAX 已经基于 length 被替换掉了 // 然后计算 *start 和 *stop 之间的距离，也就是应该要遍历多少个元素 if (step < 0) { if (*stop < *start) { return (*start - *stop - 1) / (-step) + 1; } } else { if (*start < *stop) { return (*stop - *start - 1) / step + 1; } } // 如果不符合条件的话，比如像 data[3: 8: -1]，显然遍历不到任何元素 // 那么直接返回 0 return 0;\n} 可以看到，哪有什么岁月静好，我们之所以能够通过各种姿势使用切片，全靠解释器在替我们负重前行，它在背后做了非常多的工作。正如前面提到的，C 是一门很单纯的语言，Python 的花里胡哨的操作回归到 C 里面，就是普通的 if else 以及 while、for。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片属性的初始化","id":"93","title":"切片属性的初始化"},"94":{"body":"以上我们就介绍了切片的底层结构，切片也是一个对象，拥有自己的缓存。并且 Python 针对切片提供的语法也非常丰富： data[:: 1]，从左往右遍历，或者说从前往后遍历； data[:: -1]，从右往左遍历； data[:: 2]，只筛选索引为偶数的元素； 起始位置和终止位置可以为负数，会自动转成正数； 所以切片用起来很方便，但要明白这背后都是因为解释器做了大量的工作。当然大部分情况下我们使用切片都是无感知的，一般不会刻意地想着要去创建一个切片，只是字符串、列表、元组等数据都支持通过切片截取数据，所以切片还是值得我们深入了解一下的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 小结","id":"94","title":"小结"},"95":{"body":"本篇文章来聊一聊 bytes 对象，也就是字节串，而说到字节串就不得不提字符串。 字符串是由任意数量的字符组成的序列，用于表示文本数据。在大多数编程语言中，字符串被视为一种高层数据类型，能够处理和操作文本信息。 字节串是由任意数量的字节组成的序列，用于表示二进制数据。 字符串具有特定的字符编码，比如 UTF-8、ASCII 等等，这些编码定义了字符如何在内存中表示。而字节串没有预定义的编码，它只是原始的二进制序列，在处理非文本数据时非常有用。 计算机在存储数据以及通过网络传输数据时，数据格式都是二进制字节串，所以如果你想传输一段文本，那么必须先将它转成字节串。 name = \"古明地觉\" print(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\"\nprint(name.encode(\"utf-16\"))\n\"\"\"\nb'\\xff\\xfe\\xe4S\\x0ef0W\\xc9\\x89'\n\"\"\"\nprint(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\" 字节串传输之后还需要转成文本数据，这个过程叫做反序列化。但由于字节串不保存编码信息，它只是一坨字节流，因此反序列化时还需要知道指定的编码，如果编码指定错误，那么反序列化会失败。 # name_utf8 和 name_gbk 都只是普通的字节串\nname_utf8 = b'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\nname_gbk = b'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5' # 如果反序列化，必须要知道原始文本使用的编码是什么\nprint(name_utf8.decode(\"utf-8\"))\nprint(name_gbk.decode(\"gbk\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 如果指定了错误的编码，那么反序列化会失败\ntry: name_utf8.decode(\"gbk\")\nexcept UnicodeDecodeError as e: print(e)\n\"\"\"\n'gbk' codec can't decode byte 0xa7 in position 10: illegal multibyte sequence\n\"\"\" 另外我们看到字符串只有 4 个字符，但序列化之后的字节串却明显多于 4 个字节。这是因为一个字节最多能表示 256 个字符，对于英文字符来说已经足够了，但对于非英文字符则力不从心，毕竟光普通的中文字符就好几千个。 所以便有了多字节编码，它使用多个字节来表示一个字符，具体使用多少个，则取决于编码。如果是 GBK 编码，那么两个字节表示一个字符，如果是 UTF-8 编码，那么三个字节表示一个字符，当然这里的字符指的是非英文字符。所以在反序列化的时候，需要指定正确的编码，否则解析一定会失败。 以上就是关于 bytes 对象的一些基础概念，下面来看一下它的底层结构。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 楔子","id":"95","title":"楔子"},"96":{"body":"字节串的类型是 bytes，那么我们有理由相信它在底层由 PyBytesObject 结构体表示。 // Include/bytesobject.h\ntypedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 我们看一下里面的字段： PyObject_VAR_HEAD：变长对象的公共头部，因为字节串是由若干个字节组成的，具有长度的概念，所以它是变长对象。 ob_shash：保存字节串的哈希值，因为计算哈希值需要遍历所有的字节，如果每获取一次哈希值都要重新计算的话，性能会有影响。所以第一次计算之后会用 ob_shash 字段保存起来，之后就不再计算了。如果 bytes 对象的哈希值尚未计算，那么 ob_shash 为 -1。 ob_sval：char 类型的数组，负责保存具体的字节。这个和整数的 ob_digit 字段的声明方式类似，由于数组长度不属于类型的一部分，因此虽然声明的时候长度是 1，但其实长度不受限制，具体是多少取决于 bytes 对象的字节数量。 我们创建几个不同的 bytes 对象，然后通过画图感受一下。 val = b\"\" 我们看到即便是空的字节序列，底层的 ob_sval 也需要一个 '\\0'，那么这个结构体实例占多大内存呢？首先 ob_sval 之外的四个成员，每个都占 8 字节，而 ob_sval 是一个 char 类型的数组，一个 char 占 1 字节，所以 bytes 对象的内存大小等于 32 + ob_sval 的长度。 而 ob_sval 里面至少有一个 '\\0'，因此一个空的字节序列需要占 33 字节的内存。 >>> sys.getsizeof(b\"\")\n33 注意：ob_size 统计的是 ob_sval 中有效字节的个数，不包括 '\\0'，但是计算占用内存的时候，显然是需要考虑在内的，因为它确实占用了一个字节的空间。因此我们说 bytes 对象占的内存等于 33 + ob_size 也是可以的。 val = b\"abc\" 显然内存大小等于 32 + 4 = 36 字节。 因此 bytes 对象的底层结构还是很好理解的，因为它是字节序列，所以在底层用一个 char 类型的数组来维护具体的值再合适不过了。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 字节串的底层结构","id":"96","title":"字节串的底层结构"},"97":{"body":"下面来看一下 bytes 对象的创建方式，这里我们暂时先不介绍底层是如何创建的，等到介绍缓存池的时候再说。这里来聊一聊如何在 Python 中创建，虽然该系列是剖析源码，但是光说底层的话可能会有一些无趣，因此这个过程中也会穿插大量的 Python 内容。 先观察 Python 代码执行时的表现，再通过底层的源码进行解析，两者结合起来更容易让人理解。另外该系列也能保证即使你没有相应的 C 语言基础，也一样能收获很多。 b = b\"hello\" 以上是最简单的创建方式，它使用我们之前说的特定类型 API，但通过这种方式创建的字节串只能包含 ASCII 字符。下面这种方式是不行的： b = b\"古明地觉\" \"古明地觉\" 包含非 ASCII 字符，所以采用多字节编码，但编码方式也有多种，比如 UTF-8、GBK 等等，解释器不知道你用的是哪一种。因此采用字面量的方式，只能包含 ASCII 字符，因为对于 ASCII 字符而言，不管使用哪种编码，得到的结果都是一样的。但如果包含非 ASCII 字符，那么必须手动指定编码。 b = bytes(\"古明地觉\", encoding=\"utf-8\")\nprint(b)\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 里面的 \\x 表示十六进制，我们知道字符 a 的 ASCII 码是 97，对应十六进制是 61。同理字符 b 是 62，字符 c 是 63，那么 b\"abc\" 就还可以这么创建。 b = b\"\\x61\\x62\\x63\"\nprint(b)\n\"\"\"\nb'abc'\n\"\"\" 以上是根据十六进制的数字创建 bytes 对象，注意：采用这种方式创建必须指定 \\x，然后 b\"\\x61\" 表示的是 1 个字节，并且该字节对应的 ASCII 码的十六进制是 61，也就是字符 a。而 b\"61\" 表示的是两个字节。 # \\x61、\\x62、\\x63 均表示 1 字节\nprint(b\"\\x61\\x62\\x63\")\n\"\"\"\nb'abc'\n\"\"\"\n# 下面这个创建的 bytes 对象是 6 字节\nprint(b\"616263\")\n\"\"\"\nb'616263'\n\"\"\" 可如果有一串字符也是十六进制格式，但开头没有 \\x，这个时候要怎么转成 bytes 对象呢？很简单，使用 bytes.fromhex 方法即可。 print(bytes.fromhex(\"616263\"))\n\"\"\"\nb'abc'\n\"\"\" # 转成 bytes 对象之后，如果是可打印字符的话\n# 那么会显示对应的字符，比如 abc\n# 如果是不可打印字符，就原本输出，比如 \\xff\nprint(bytes.fromhex(\"616263FF\"))\n\"\"\"\nb'abc\\xff'\n\"\"\" 该方法会将里面的字符串当成十六进制来解析，得到 bytes 对象。并且使用这种方式的话，字符的个数一定是偶数，每个字符的范围均是 0~9、A~F（或者 a~f）。因为十六进制需要两个字符来表示，范围是 00 到 FF。即便小于 16，也必须用两个字符表示，比如我们可以写 05，但绝不能只写个 5。 总之使用 bytes.fromhex 创建时，字符串的长度一定是一个偶数，从前往后每两个分为一组。使用字面量的方式创建时也是如此，比如我们可以写成 b\"\\x01\\x02\"，但不能写成 b\"\\x1\\x2\"。 # 不可以写成 b\"\\x0\"，会报错\nprint(b\"\\x00\") # b'\\x00' # \\x 后面至少跟两个字符，但这里跟了 3 个字符\n# 所以 \\x 会和 61 组合得到 'a'\n# 至于后面的那个 1 就单纯的表示字符 '1'\nprint(b\"\\x611\") # b'a1' 所以 \\x 后面可以跟超过两个以上的字符，超过两个以上的部分会被当成普通字符来处理，与十六进制无关。每个 \\x 只和它后面的两个字符结合，因此 \\x 后面不能少于两个字符。 然后我们通过索引获取的时候，得到的也是一个整数： b = \"古\".encode(\"utf-8\")\nprint(b) # b'\\xe5\\x8f\\xa4'\nprint([b[0], b[1], b[2]]) # [229, 143, 164] 所以 bytes 对象的每个字节都是 0 ~ 255 之间的一个整数，那么问题来了，如果我有每个字节对应的整数，那么如何再转成 bytes 对象呢？ # 里面的每个整数都必须位于 0 ~ 255 之间\nprint(bytes([229, 143, 164]))\nprint(bytes([229, 143, 164, 97, 98, 99]))\n\"\"\"\nb'\\xe5\\x8f\\xa4'\nb'\\xe5\\x8f\\xa4abc'\n\"\"\" print(bytes([229, 143, 164]).decode(\"utf-8\"))\nprint(bytes([229, 143, 164, 97, 98, 99]).decode(\"utf-8\"))\n\"\"\"\n古\n古abc\n\"\"\" 以上就是 bytes 对象的几种创建方式，我们再总结一下。 # 1）通过字面量的方式创建\nprint(b\"hello\") # b'hello'\n# 也可以使用十六进制的 ASCII 码，但要指定 \\x 前缀\n# \\x 会和它后面的两个数字（范围是 0 ~ 9、A ~ F）进行组合，表示一个字符\nprint(b\"\\x61\\x62\\x63\") # b'abc'\n# 除了十六进制之外，还可以使用八进制的 ASCII 码，前缀是 \\\n# \\ 会和它后面的三个数字（范围是 0 ~ 7）进行组合，表示一个字符\n# 97、98、99 对应的八进制为 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Python 编写，然后放在 Lib 目录下面。 Modules 目录 Python 的内置库，这些库都是用 C 编写的，编译之后会内嵌在解释器里面。我们举个例子： import random, _random\nimport re, _sre\nimport io, _io\nimport ast, _ast 以 random 为例，它是用来生成随机数的，和性能密切相关。所以它的核心功能由 C 编写，编译之后内嵌在解释器里，模块名为 _random。只不过 Python 又封装了一个 random，在内部会导入 _random，像 re 和 _sre、asyncio 和 _asyncio 都是类似的关系。 Modules 目录里面实现了大量和性能相关的模块，比如 sys、time、gc 等等，我们后续再聊。 Objects 目录 包含 Python 内置数据结构的底层实现，像字典、列表、元组、函数等，底层实现都定义在 Objects 目录中。 Parser 目录 负责 Python 代码的编译，虽然 Python 是解释型语言，但也是要经过编译的。编译的结果为 PyCodeObject 对象，它里面包含了要执行的字节码，编译完之后会交给虚拟机执行。 所以 Python 解释器 = Python 编译器 + Python 虚拟机。 Python 目录 Python 虚拟机的具体实现，字节码的执行、执行环境的管理等都在里面。 Mac 目录 用于 Mac OS X 平台的特定工具和脚本。 Misc 目录 包含各种杂项文件，如配置脚本、工具等。 PC 目录 专为 Windows 平台编写的配置文件和特定扩展。 PCbuild 目录 用于在 Windows 上编译 Python 的项目文件。 Programs 目录 包含 Python 其它可执行文件（如 IDLE）的源代码。 Tools 目录 包含用 Python 编写的各种脚本和工具，帮助开发和维护 Python。 以上就是 CPython 的源码结构，对它有一个基本的认识有助于我们后续的源码学习。","breadcrumbs":"1. CPython 源码长什么样子？ » CPython 源码结构","id":"1","title":"CPython 源码结构"},"10":{"body":"不可变对象一旦创建，其内存中存储的值就不可以再修改了。如果想修改，只能创建一个新的对象，然后让变量指向新的对象，所以前后的地址会发生改变。而可变对象在创建之后，其存储的值可以动态修改。 像整数就是一个不可变对象。 >>> a = 666\n>>> id(a)\n140176818069136\n>>> a += 1\n>>> id(a)\n140176818068368 我们看到执行 a += 1 操作之后，前后地址发生了变化，所以整数不支持本地修改，因此是一个不可变对象； 原来 a = 666，而我们说操作一个变量等于操作这个变量指向的内存，所以 a += 1 会将 a 指向的整数对象 666 和 1 进行加法运算，得到 667。因此会开辟新的空间来存储 667，然后让 a 指向这片新的空间。至于原来的 666 所占的空间怎么办，解释器会看它的引用计数，如果不为 0 代表还有变量引用（指向）它，如果为 0 则证明没有变量引用了，所以会被回收。 关于引用计数，我们后面会详细说，目前只需要知道，如果对象被变量引用了，那么该对象的引用计数就会加 1。有几个变量引用，那么它的引用计数就是几。 除了整数之外，浮点数、字符串、布尔值等等，都是不可变对象，它们的值不能本地修改。 然后是可变对象，像列表、字典、集合等都是可变对象，它们支持动态修改。 这里先多提一句，Python 对象本质上就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。Python 的任何对象在 C 中都会对应一个结构体，这个结构体除了存放具体的值之外，还存放了一些额外信息，具体细节在后续剖析内置对象的时候会细说。 在上一篇文章中我们说到，列表、元组、集合这些容器的内部存储的不是具体的对象，而是对象的指针。比如：lst = [1, 2, 3]，你以为列表存储的是三个整数对象吗？其实不是的，它存储的是三个整数对象的指针，当我们获取 lst[0] 的时候，拿到的是一个指针，但是操作（比如 print）的时候会自动操作指针指向的内存。 因为 Python 底层是用 C 实现的，所以列表的实现必然要借助 C 的数组。可 C 数组里面的元素的类型是一致的，但列表却可以存放任意的元素，因此从这个角度上讲，列表里面的元素就不可能是对象，因为不同的对象在底层对应的结构体是不同的，所以元素只能是指针。 可能有人又好奇了，不同对象的指针也是不同的啊，是的，但 C 指针是可以转化的。Python 底层将所有对象的指针，都转成了 PyObject 类型的指针，这样不就是同一种类型的指针了吗？关于这个 PyObject，它是我们后面要剖析的重中之重，贯穿了整个系列。不过目前只需要知道列表（还有其它容器）存储的元素、以及 Python 的变量，它们都是一个泛型指针 PyObject *。 >>> lst = [1, 2, 3]\n>>> id(lst)\n140176818170432\n>>> lst.append(4)\n>>> lst.append(5)\n>>> lst\n[1, 2, 3, 4, 5]\n>>> id(lst)\n140176818170432 我们看到列表在添加元素的时候，前后地址并没有改变。列表在 C 中是通过 PyListObject 结构体实现的，我们在介绍列表的时候会细说。这个 PyListObject 内部除了一些基本信息之外，还维护了一个 PyObject 的二级指针，指向了 PyObject * 类型的数组的首元素。 显然图中的指针数组用来存储具体的对象的指针，每一个指针都指向了相应的对象（这里是整数对象）。 然后我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了一个二级指针。显然添加、删除、修改元素等操作，都是通过这个二级指针来间接操作指针数组。 因为一个对象一旦被创建（任何语言都是如此），那么它在内存中的大小就不可以变了。所以这就意味着那些可以容纳可变长度数据的可变对象，要在内部维护一个指针，指针指向一片内存区域，该区域存放具体的数据。如果空间不够了，那就申请一片更大的内存区域，然后将元素依次拷贝过去，再让指针指向新的内存区域。而列表的底层也是这么做的，其内部并没有直接存储具体的指针数组，而是存储了指向指针数组首元素的二级指针。 那么问题来了，为什么要这么做？ 其实很好理解，遵循这样的规则可以使通过指针维护对象的工作变得非常简单。一旦允许对象的大小可在运行期改变，那么我们就要考虑如下场景。 在内存中有对象 A，并且其后面紧跟着对象 B。如果在运行的某个时候，A 的大小增大了，这就意味着必须将 A 整个移动到内存中的其他位置，否则 A 增大的部分会覆盖掉原本属于 B 的数据。但要将 A 移动到内存的其他位置，那么所有指向 A 的指针就必须立即得到更新。可想而知这样的工作是多么的繁琐，因此通过在可变对象的内部维护一个指针就变得简单多了。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 可变对象和不可变对象","id":"10","title":"可变对象和不可变对象"},"100":{"body":"根据解释器 API 的命名规则，bytes 类型在底层应该对应 PyBytes_Type。 // Objects/bytesobject.c\nPyTypeObject PyBytes_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bytes\", PyBytesObject_SIZE, sizeof(char), // ... &bytes_as_number, /* tp_as_number */ &bytes_as_sequence, /* tp_as_sequence */ &bytes_as_mapping, /* tp_as_mapping */ // ...\n}; 实例对象的大小信息保存在类型对象中，由 tp_basicsize 和 tp_itemsize 负责维护。 tp_basicsize：实例对象的基本大小，对于 bytes 对象来说就是 PyBytesObject_SIZE。 tp_itemsize：如果实例对象是变长对象，并且结构体本身还保存了具体的元素，那么该字段则表示每个元素的大小，否则为 0。对于 bytes 对象来说就是 sizeof(char)，即 1 字节。 其中 PyBytesObject_SIZE 是一个宏，等于 offsetof(PyBytesObject, ob_sval) + 1，也就是结构体的起始位置到 ob_sval 字段的偏移量再加 1。显然这个大小是固定不变的基础大小，那么它等于多少呢？ typedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 很明显，大小是 32 + 1 = 33 字节，然后再加上 sizeof(char) * ob_size 就是整个 bytes 对象的大小。由于 sizeof(char) 等于 1，所以 bytes 对象的大小等于 PyBytesObject_SIZE 加上 ob_size，我们后面介绍 bytes 对象的创建时会看到。 然后看一下方法簇，我们发现这三个方法簇 bytes 对象居然都支持。 // Objects/bytesobject.c static PyNumberMethods bytes_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ bytes_mod, /*nb_remainder*/\n}; static PySequenceMethods bytes_as_sequence = { // 计算长度，如 len(b\"abc\") (lenfunc)bytes_length, /*sq_length*/ // 将两个 bytes 对象相加 // 比如 b\"abc\" + b\"def\" (binaryfunc)bytes_concat, /*sq_concat*/ // 将 bytes 对象重复 N 次 // 比如 \"abc\" * 3 (ssizeargfunc)bytes_repeat, /*sq_repeat*/ // 基于索引获取 bytes 对象的指定元素 // 比如 b\"abc\"[1] (ssizeargfunc)bytes_item, /*sq_item*/ 0, /*sq_slice*/ 0, /*sq_ass_item*/ 0, /*sq_ass_slice*/ // 判断 bytes 对象是否包含某个元素 (objobjproc)bytes_contains /*sq_contains*/\n}; static PyMappingMethods bytes_as_mapping = { // 获取 bytes 对象的长度 (lenfunc)bytes_length, // 基于切片截取 bytes 对象 (binaryfunc)bytes_subscript, 0,\n}; 对于数值型操作，bytes 对象实现了 nb_remainder，它居然支持求余数，这是怎么回事？好吧，我表现的有些刻意了，其实就是一个字节串的格式化操作。 对于序列型操作，bytes 对象支持五个，从名字上看也知道是做什么的，不过这些我们一会儿都会说。 对于映射型操作，bytes 对象支持两个。虽然 bytes 对象不是字典，但解释器允许它做一些类似于映射的操作，这种设计使得 bytes 对象具有更加丰富和灵活的操作接口。 下面我们就来详细介绍这些操作的底层实现，它们都位于 Objects/bytesobject.c 中。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 类型","id":"100","title":"bytes 类型"},"101":{"body":"bytes 对象借用取模运算符 % 实现格式化，它对应 bytes_as_number->nb_remainder 字段，该字段被赋值为 bytes_mod。 static PyObject *\nbytes_mod(PyObject *self, PyObject *arg)\n{ if (!PyBytes_Check(self)) { Py_RETURN_NOTIMPLEMENTED; } // PyBytes_AS_STRING 会返回 PyBytesObject 的 ob_sval 字段 // PyBytes_GET_SIZE 会返回 PyBytesObject 的 ob_size 字段，即长度 // arg 是传递的参数，它是一个元组 return _PyBytes_FormatEx(PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self), arg, 0);\n} 最终会调用 _PyBytes_FormatEx 进行格式化，我们再以 Python 为例。 info = b\"name: %s, age: %d\"\nprint(info % (b\"satori\", 17)) # b'name: satori, age: 17' bytes 对象的格式化，在工作中其实用的不多。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 对象的格式化","id":"101","title":"bytes 对象的格式化"},"102":{"body":"计算字节串的长度会执行 bytes_as_sequence->sq_length，该字段被赋值为 bytes_length。 static Py_ssize_t\nbytes_length(PyBytesObject *a)\n{ return Py_SIZE(a);\n} Py_SIZE 是一个宏，我们之前说过，它会返回对象的 ob_size。 name = b\"satori\"\n# 直接返回 ob_size\nprint(len(name)) # 6 ob_size 维护了 bytes 对象的有效字节个数，计算长度的时候直接返回。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 计算 bytes 对象的长度","id":"102","title":"计算 bytes 对象的长度"},"103":{"body":"bytes 对象支持乘法操作，可以重复指定次数，举个例子。 word = b\"abc\"\n# 重复 3 次\nprint(word * 3) # b'abcabcabc' 我们看到这里使用了乘法运算符，所以很容易联想到 PyNumberMethods 的 nb_mul，但对于 bytes 对象而言却不是这样，它对应的是 PySequenceMethods 的 sq_repeat。所以 Python 的同一个操作符，在底层会对应不同的函数，比如 long_mul 和 float_mul、以及这里的 bytes_repeat，在 Python 的层面都是 * 这个操作符。 下面我们看一下具体逻辑，它由 bytes_repeat 函数实现。 static PyObject *\nbytes_repeat(PyBytesObject *a, Py_ssize_t n)\n{ Py_ssize_t i; Py_ssize_t j; Py_ssize_t size; // 新创建的 bytes 对象的 ob_size PyBytesObject *op; // 指向新创建的 bytes 对象 size_t nbytes; // 应该为 bytes 对象内部的 char 数组（ob_sval）申请多大内存 // 如果 bytes 对象乘上一个小于 0 的数，那么等价于乘以 0 if (n < 0) n = 0; // Py_SIZE(a) * n 就是新创建的 bytes 对象的长度 // 如果这个长度超过了 PY_SSIZE_T_MAX，那么报错，字节串过长 // 另外注意这里的条件，正常思路是 Py_SIZE(a) * n > PY_SSIZE_T_MAX // 但为了避免 Py_SIZE(a) * n 发生溢出，所以改成了除法 // 这个和我们写二分查找求平均值是一个道理 if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) { PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 将 Py_SIZE(a) * n 赋值给 size size = Py_SIZE(a) * n; // 如果 size 和 Py_SIZE(a) 相等，说明 n 为 1，或者 Py_SIZE(a) 为 0 // 但不管哪一种，都意味着新创建的 bytes 对象和原始的 bytes 对象是相同的 // 既然这样的话，就没必要创建了，直接给原始的 bytes 对象的引用计数加一，然后返回即可 if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) { Py_INCREF(a); return (PyObject *)a; } // 需要为内部的 char 数组申请的内存大小，一个元素一个字节 // 注：严格意义上说，nbytes 应该等于 char 数组的内存大小减 1 // 因为额外存储 '\\0' 所需的一字节被算在了 PyBytesObject_SIZE 里面 // 所以这个 nbytes 的含义其实和 bytes 对象的长度是等价的 nbytes = (size_t)size; // PyBytesObject_SIZE + nbytes 便是 bytes 对象的内存大小了 // 但如果两者相加的结果反而小于等于 nbytes，说明产生溢出了（发生了环绕） if (nbytes + PyBytesObject_SIZE <= nbytes) { // 那么报错，字节串太长了 PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 为新创建的 bytes 对象申请 PyBytesObject_SIZE + nbytes 大小的内存 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + nbytes); // 如果 op 为 NULL，说明内存不足 if (op == NULL) return PyErr_NoMemory(); // 初始化，将 op->ob_type 设置为 &PyBytes_Type，将 op->ob_size 设置为 size (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); // 将 ob_shash 初始化为 -1，等到需要计算的时候，再更新 ob_shash // 一旦更新，后续就不用再计算了，会直接返回 ob_shash op->ob_shash = -1; // ob_sval 要额外存储一个 '\\0'，显然它位于索引为 size 的位置 // 因此有效字符的数量为 size，但 ob_sval 的大小为 size + 1 // 那么问题来了，既然这样的话，nbytes 应该等于 size + 1 才对，为啥等于 size 呢 // 很简单，原因已经说过了，因为 PyBytesObject_SIZE 为 offsetof(PyBytesObject, ob_sval) + 1 // offsetof(PyBytesObject, ob_sval) 表示从结构体起始位置到 ob_sval 的偏移量 // 或者你也可以理解为 ob_sval 之前的所有字段的大小 // 但它又额外加上了 1，所以 '\\0' 需要的空间已经被申请了，因此没有问题 op->ob_sval[size] = '\\0'; // 此时对象的内存就已经申请好了，类型、长度等元数据也设置好了，接下来就是拷贝元素了 // 首先做一个快分支判断，如果原始的 bytes 对象的长度为 1，证明新的 bytes 对象的所有字节都是一样的 // 直接将 op->ob_sval 里面的 n 个元素设置为 a->ob_sval[0] 即可 if (Py_SIZE(a) == 1 && n > 0) { memset(op->ob_sval, a->ob_sval[0] , n); return (PyObject *) op; } // 否则将 a->ob_sval 里面除了 '\\0' 之外的有效字符拷贝到 op->ob_sval 里面 // 每次拷贝 Py_SIZE(a) 个字符，直到拷贝的字符个数达到 size i = 0; if (i < size) { memcpy(op->ob_sval, a->ob_sval, Py_SIZE(a)); i = Py_SIZE(a); } while (i < size) { j = (i <= size-i) ? i : size-i; memcpy(op->ob_sval+i, op->ob_sval, j); i += j; } // 将 PyBytesObject * 类型的 op 转成 PyObject *，然后返回，交给变量保存 return (PyObject *) op;\n} 所以通过观察源码，你会发现 Python 里面的操作并没有什么神奇的，简单思考一下就知道它的底层逻辑。再比如后续介绍的切片截取，即使现在还没看具体源码，但也能猜到底层就是单纯的 for 循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 将 bytes 对象重复 N 次","id":"103","title":"将 bytes 对象重复 N 次"},"104":{"body":"bytes 对象也支持通过索引和切片截取指定部分的元素。 buf = b\"abcde\"\n# 基于索引获取元素，拿到的是整数\nprint(buf[0]) # 97\n# 基于切片获取元素，拿到的依旧是字节串\nprint(buf[0: 1]) # b'a' 那么底层是怎么做的呢？ static PyObject*\nbytes_subscript(PyBytesObject* self, PyObject* item)\n{ // 如果是 buf[0] 这种，那么 self 就是 buf，item 就是 0 // 如果是 buf[0: 3] 这种，那么 self 就是 buf，item 就是 slice(0, 3) // 所以要对 item 进行检测，判断它到底是索引还是切片 if (PyIndex_Check(item)) { // 如果 item 是整数或者实现了 tp_as_number->nb_index // 那么表示索引，会转成 Py_ssize_t，如果转换失败，那么会设置异常回溯栈 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError); // 如果 PyErr_Occurred() 为真，那么表示有异常发生 // 但问题是这里为什么要多一个 i == -1 呢？我们稍后再说 if (i == -1 && PyErr_Occurred()) return NULL; // 如果转换之后发现 i 小于 0，表示使用的是负数索引 // 那么要加上长度，变成正数索引，因此负数索引本质上也是 Python 的一个语法糖 if (i < 0) i += PyBytes_GET_SIZE(self); // 到这里发现 i 如果还小于 0，或者本身大于等于长度，那么索引越界 if (i < 0 || i >= PyBytes_GET_SIZE(self)) { PyErr_SetString(PyExc_IndexError, \"index out of range\"); return NULL; } // 否则说明索引 i 是合法的，那么获取数组 ob_sval 中索引为 i 的元素 // 但拿到的是 C 的整数，所以还要基于 C 整数创建 Python 整数，然后返回 return PyLong_FromLong((unsigned char)self->ob_sval[i]); } // 如果 item 是切片 else if (PySlice_Check(item)) { // 我们知道切片有三个属性，分别是起始位置、终止位置、步长 Py_ssize_t start, stop, step, slicelength, i; size_t cur; char* source_buf; char* result_buf; PyObject* result; // 解析切片，将内部属性赋值给 start、stop、step // 关于 PySlice_Unpack 我们在介绍切片的时候说过 if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 这个函数在介绍切片的时候也说过 // 它会调整 start 和 stop 的值，比如将负数转成正数，然后返回应该遍历的元素个数 slicelength = PySlice_AdjustIndices(PyBytes_GET_SIZE(self), &start, &stop, step); // 如果小于等于 0，说明截取不到任何元素，因此直接返回空字节串 if (slicelength <= 0) { // 基于 C 的字符数组和拷贝的字节数，创建 Python 的字节串 return PyBytes_FromStringAndSize(\"\", 0); } // 如果 start 为 0，step 为 1，并且截取的元素个数和原始字节串的长度相等 // 比如 buf[::] 这种，说明截取之后的字节串和原始字节串相同 // 那么直接给原始字节串增加一个引用计数，然后返回即可 else if (start == 0 && step == 1 && slicelength == PyBytes_GET_SIZE(self) && PyBytes_CheckExact(self)) { Py_INCREF(self); return (PyObject *)self; } // 如果步长为 1，那么从索引为 start 的位置截取 slicelength 个字节即可 // PyBytes_AS_STRING(self) 会返回字节串的 ob_sval，即 C 字符数组 // ob_sval + start 会将指针偏移到索引为 start 的位置 // 然后通过 C 的 memcpy 函数从 start 开始拷贝 slicelength 个字节 else if (step == 1) { return PyBytes_FromStringAndSize( PyBytes_AS_STRING(self) + start, slicelength); } // 否则说明步长不为 1，此时只能使用循环了 else { // 拿到原始字节串的 ob_sval source_buf = PyBytes_AS_STRING(self); // 创建长度为 slicelength 的字节串 // 注意：此时内部字符数组的容量已经有了，但还没有元素 result = PyBytes_FromStringAndSize(NULL, slicelength); if (result == NULL) return NULL; // 拿到新创建的字节串的 ob_sval result_buf = PyBytes_AS_STRING(result); // 从 start 开始遍历，遍历 slicelength 次，指针每次跳 step 个元素 for (cur = start, i = 0; i < slicelength; cur += step, i++) { // 将元素设置进去 result_buf[i] = source_buf[cur]; } // 返回 return result; } } // 如果 item 既不是整数也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"byte indices must be integers or slices, not %.200s\", Py_TYPE(item)->tp_name); return NULL; }\n} 虽然代码有点长，但逻辑一点都不难。还是那句话，对于 C 这样朴素的语言来说，就是 if 判断加循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 基于索引和切片获取元素","id":"104","title":"基于索引和切片获取元素"},"105":{"body":"在看 bytes_subscript 源码时，我们提出了一个问题。 上面代码中为什么要有一个 i == -1 判断呢？要解释这一点，首先必须要理解 Python 的异常是怎么抛出来的。 所谓的抛异常，本质上就是底层的某个 C 函数的代码逻辑出现了问题，不能继续执行了，于是将异常信息设置到回溯栈中，并给出一个表示错误的返回值。当解释器发现返回值不对时，就知道程序出错了，于是将回溯栈的异常写入到 stderr（标准错误输出）中。 比如这里，当检测到索引小于 0 或大于等于长度时，就知道索引越界了，不能再执行了。于是会通过 PyErr_SetString 将异常设置到回溯栈中，并返回了 NULL，表示错误的返回值。 因为对于当前函数来说，它的返回值类型是 PyObject *，如果正常执行，那么返回值应该指向一个合法的 PyObject。但当逻辑出现错误时，就意味着函数不能再执行了，于是设置异常并返回 NULL。而解释器在看到返回值为 NULL 时，就知道该函数执行出现错误了，那么会将回溯栈里的异常信息输出到 stderr 中， data = []\n# data[1] 在底层会执行 bytes_subscript(data, 1)\n# 但是发现索引 1 大于等于长度，于是会将异常信息写入到 stderr，并返回 NULL\n# 解释器发现返回的是 NULL，就知道执行出错了，否则返回值一定会指向一个合法的 PyObject\n# 于是解释器会将回溯栈里的异常写入到 stderr，并终止运行（暂时不考虑异常捕获）\nprint(data[1]) 在 Python 中看到的就是下面这个样子。 所以这就是抛异常的本质，如果 C 函数执行逻辑有问题，那么会以异常的形式将信息写入到回溯栈，并给出一个表示错误的返回值。外界发现返回值有问题时，就知道执行出错了，最终会由解释器将回溯栈里的异常写入到 stderr 当中。 既然 C 函数执行出现问题会设置异常，那么判断函数执行是否有问题，除了看它的返回值是否正常之外，还可以通过检测异常回溯栈。如果回溯栈里面有异常，调用 PyErr_Occurred 会返回真，否则返回假。 但 PyErr_Occurred 的效率稍微低一些，而直接判断返回值会更快，因为只是一个比较操作。比如这里的 bytes_subscript 函数，只需要检测它的返回值是否等于 NULL 即可判断函数执行是否出现异常。因为返回值类型是 PyObject *，如果正常执行，返回值一定不是 NULL，否则说明程序出问题了。 但 PyNumber_AsSsize_t 函数则不同，该函数的返回值类型是整型。 索引要么是整数，要么是实现了 __index__ 的类的实例对象，内部调用的 _PyNumber_Index 会统一将 item 转成 Python 整数并返回，如果转换失败则设置异常并返回 NULL。 而 PyNumber_AsSsize_t 函数则负责将 Python 整数转成 C 的 ssize_t 整数，但当它发现返回的 value 没有指向一个合法的 PyObject，而是 NULL，就知道 _PyNumber_Index 执行失败了。那么对于 PyNumber_AsSsize_t 而言，它也不能再执行了，应该返回一个表示错误的返回值。但 PyNumber_AsSsize_t 的返回值类型不是 PyObject *，而是整型，所以它不能返回 NULL。那么返回多少呢？解释器使用 -1 来充当表示错误的哨兵返回值。 但 -1 除了可以表示出现错误，也可能是函数正常执行，而返回值本身就是 -1。所以和指针类型不同，对于指针类型，通过返回值是否为 NULL 即可判断函数是否执行正常，而返回整型则需要借助 PyErr_Occurred。 比如发现 i 不等于 -1，说明 PyNumber_AsSsize_t 执行正常，不用再判断了。如果 i 等于 -1，那么则需要进一步检查异常回溯栈，如果栈不为空，证明确实发生错误了。如果栈为空，证明此时返回的 -1 不是因出现错误而返回的哨兵值，而是函数正常执行、但返回值本身就是 -1。 假设 PyNumber_AsSsize_t 因为索引类型不合法而返回了 -1，那么 bytes_subscript 就知道调用出现了错误，于是也不能再执行了，于是立即返回。由于它的返回值类型是 PyObject *，所以会返回 NULL。而最后当解释器看到 bytes_subscript 返回的是 NULL 时，就知道程序应该报错，于是会将回溯栈里的异常抛出来，并结束进程。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 聊一聊异常","id":"105","title":"聊一聊异常"},"106":{"body":"以上我们就介绍了 bytes 对象（字节串）的一些操作的底层实现，不过还没结束，下一篇文章我们来聊一聊 bytes 对象的加法运算。 当然加法运算本身很简单，之所以单独摘出来是因为背后涉及一个非常重要的概念：缓冲区，它也是 Numpy 得以实现的关键，下一篇文章细聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 小结","id":"106","title":"小结"},"107":{"body":"bytes 对象支持加法运算，将两个 bytes 对象合并为一个，举个例子。 b1 = b\"abc\"\nb2 = b\"def\"\nprint(b1 + b2) # b'abcdef' 这背后是怎么实现的呢？我们通过源码分析一下，并通过 bytes 对象的相加，介绍一下缓冲区的知识。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 楔子","id":"107","title":"楔子"},"108":{"body":"提到加法，很容易联想到 PyNumberMethods 的 nb_add，比如：PyLongObject 的 long_add 和 PyFloatObject 的 float_add。 但对于 bytes 对象而言却不是这样，加法操作对应的是 PySequenceMethods 的 sq_concat。所以我们将加法运算改成合并，会更合适一些，只是它在 Python 层面对应的也是 + 操作符。对于 bytes 对象而言，sq_concat 字段会被赋值为 bytes_concat。 static PyObject *\nbytes_concat(PyObject *a, PyObject *b)\n{ // 两个 Py_buffer 结构体类型的变量，用于维护缓冲区 // 关于缓冲区，我们一会儿说 Py_buffer va, vb; // 相加结果 PyObject *result = NULL; // 此时缓冲区啥也没有，默认将缓冲区的长度初始化为 -1 va.len = -1; vb.len = -1; // 每个 bytes 对象底层都对应一个缓冲区，可以通过 PyObject_GetBuffer 获取 // 这里获取两个 bytes 对象的缓冲区，然后交给变量 va 和 vb // 获取成功返回 0，获取失败返回非 0 // 如果下面的条件不成功，就意味着获取失败了，说明至少有一个老铁不是 bytes 类型 if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 || PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) { // 然后设置异常，PyExc_TypeError 表示 TypeError（类型错误） // 专门用来表示对一个对象执行了它所不支持的操作 PyErr_Format(PyExc_TypeError, \"can't concat %.100s to %.100s\", Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name); // 比如 b\"123\" + 123 就会得到 TypeError: can't concat int to bytes // 和这里设置的异常信息是一样的，然后当出现异常之后，直接跳转到 done 标签 goto done; } // 这里判断是否有一方长度为 0 // 如果 a 的长度为 0，那么相加之后的结果就是 b if (va.len == 0 && PyBytes_CheckExact(b)) { result = b; Py_INCREF(result); goto done; } // 逻辑和上面类似，如果 b 的长度为 0，那么相加之后的结果就是 a if (vb.len == 0 && PyBytes_CheckExact(a)) { result = a; Py_INCREF(result); goto done; } // 判断两个 bytes 对象合并之后，长度是否超过 PY_SSIZE_T_MAX // 所以 bytes 对象是有长度限制的，因为维护长度的 ob_size 有最大范围 // 但还是之前说的，这个条件基本不可能满足，除非你写恶意代码 // 补充一句，这个 if 条件看起来会有些别扭，更直观的写法应该像下面这样 // if (va.len + vb.len > PY_SSIZE_T_MAX)，但 va.len + vb.len 可能会溢出 if (va.len > PY_SSIZE_T_MAX - vb.len) { PyErr_NoMemory(); goto done; } // 否则的话，创建指定容量的 PyBytesObject result = PyBytes_FromStringAndSize(NULL, va.len + vb.len); if (result != NULL) { // PyBytes_AS_STRING 会获取 PyBytesObject 的 ob_sval 字段 // 将缓冲区 va 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 va.len memcpy(PyBytes_AS_STRING(result), va.buf, va.len); // 将缓冲区 vb 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 vb.len // 但是要从 va.len 的位置开始拷贝，不然会把之前的内容覆盖掉 memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len); } done: // 拷贝完之后，将 va 和 vb 里的内容释放掉，否则可能会导致内存泄漏 if (va.len != -1) PyBuffer_Release(&va); if (vb.len != -1) PyBuffer_Release(&vb); return result;\n} 代码虽然有点长，但是不难理解，重点是里面的 Py_buffer。我们以 a = b\"ab\"，b = b\"cde\" 为例，看一下 a + b 是怎么做的？ 说白了整个过程就是将 a->ob_sval 和 b->ob_sval 拷贝到 result->ob_sval 中。但问题是为啥不直接拷贝，而是要搞出来一个 Py_buffer 呢？这就要说一说 Python 的缓冲区了。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » bytes 对象的加法运算","id":"108","title":"bytes 对象的加法运算"},"109":{"body":"为了更好地理解缓冲区，我们需要解释一下什么是缓冲区协议。缓冲区协议是一个 C 级协议，它定义了一个具有数据缓冲区和元数据的 C 级结构体，这个结构体就是上面的 Py_buffer。通过 Py_buffer 来描述缓冲区的布局、数据类型和读写权限，并且还定义了支持协议的对象所必须实现的 API。 实现缓冲区协议的对象有 bytes对象、array.array 对象、以及最知名的 numpy.ndarray 对象。 至于缓冲区本身，它就是一个单纯的一维数组，负责存储具体的数据。我们以 numpy 数组为例，不管数组是多少维的，底层的缓冲区永远是一个一维数组。那么问题来了，我们在定义数组时设置的维度信息要如何体现呢？答案是通过 Py_buffer，来看一下它的底层结构。 // Include/cpython/object.h typedef struct bufferinfo { // 指针，指向具体的缓冲区，注意：缓冲区就是个一维数组 void *buf; // 指向实现缓冲区协议的对象本身 PyObject *obj; // 缓冲区的长度 Py_ssize_t len; // 缓冲区中每个元素的大小 Py_ssize_t itemsize; // 缓冲区是否只读，0 表示可读写、1 表示只读 int readonly; // 维度，比如数组的 shape 为 (3, 4, 5)，那么它的 ndim 就是 3 int ndim; // 格式化字符串，用于描述缓冲区的元素类型 char *format; // 等价于 numpy 数组的 shape // 因此缓冲区永远是个一维数组，由 buf 字段指向 // 而其它字段则负责描述这个一维数组应该怎么使用 Py_ssize_t *shape; // 在某个维度下，从一个元素到下一个元素所需要跳跃的字节数 Py_ssize_t *strides; Py_ssize_t *suboffsets; void *internal;\n} Py_buffer; 以上就是 Py_buffer，它的 buf 字段指向了具体的缓冲区，对于 bytes 对象而言就是内部的 ob_sval 字段。再比如 numpy 数组的拷贝，默认情况下在拷贝数组时只会将 Py_buffer 拷贝一份，而 Py_buffer 内部的 buf 字段指向的缓冲区则不会拷贝。 import numpy as np # Py_buffer.buf 指向了缓冲区\n# Py_buffer.shape 为 (6,)\narr1 = np.array([3, 9, 5, 7, 6, 8])\n# 将 Py_buffer 拷贝一份，并且 Py_buffer.shape 变成了 (2, 3)\n# 但 Py_buffer.buf 指向的缓冲区没有拷贝\narr2 = arr1.reshape((2, 3)) # 然后在通过索引访问的时候，可以认为 numpy 为其创建了虚拟的索引轴\n# 由于 arr1 只有一个维度，那么 numpy 会为其创建一个虚拟的索引轴\n\"\"\"\narr1 = [3 9 5 7 6 8] index1: 0 1 2 3 4 5 buf: 3 9 5 7 6 8 \"\"\"\n# arr2 有两个维度，shape 是 (2, 3)\n# 那么 numpy 会为其创建两个虚拟的索引轴\n\"\"\"\narr2 = [[3, 9, 5] [7, 6, 8]] index1: 0 0 0 1 1 1 index2: 0 1 2 0 1 2 buf: 3 9 5 7 6 8 \"\"\"\n# 缓冲区中索引为 4 的元素被修改\narr2[1, 1] = 666\n# 由于 arr1 和 arr2 共享一个缓冲区\n# 所以 print(arr1[4]) 也会打印 666\nprint(arr1[4]) # 666 以上就是缓冲区的内容，关于缓冲区在后续还会详细介绍，到时候我们也会让自定义的实例对象支持缓冲区。 回到 bytes 对象，它也实现了缓冲区协议，内部的 ob_sval（一个一维数组）就是对应的缓冲区，Py_buffer 里面的 buf 字段同样指向了这个缓冲区，而其它的字段则负责描述该如何使用这个缓冲区，可以理解为元信息。正如 numpy 的数组，虽然多个数组底层共用一个缓冲区，数据也只有一份，但在 numpy 的层面却可以表现出不同的维度，究其原因就是元信息不同。 相信你现在肯定明白 Py_buffer 存在的意义了，就是共享内存。不管什么对象，只要实现了缓冲区协议，那么就可以直接向彼此暴露自身的缓冲区。并且在操作的时候，统一使用 Py_buffer，保证不同类型的对象的操作是一致的。 import numpy as np # bytes 对象实现了缓冲区协议，后续操作时会创建 Py_buffer 实例\n# Py_buffer.buf 指向的缓冲区便是 bytes 对象的 ob_sval\n# 对于当前来说就是 {'a', 'b', 'c', 'd', '\\0'}\nb = b\"abcd\" # np.frombuffer 表示基于已有的缓冲区创建数组，因此会共享 bytes 对象的缓冲区\n# 但问题是缓冲区只是一个普通的一维数组，numpy 该怎么解析这个缓冲区呢\n# 所以我们必须显式地指定 dtype，而 \"S1\" 表示按照单个字节来进行解析\narr1 = np.frombuffer(b, dtype=\"S1\")\nprint(arr1) # [b'a' b'b' b'c' b'd'] # \"S2\" 表示按照两个字节来进行解析\narr2 = np.frombuffer(b, dtype=\"S2\")\nprint(arr2) # [b'ab' b'cd'] # 那么问题来了，按照三个字节解析是否可行呢？\n# 答案是不可行，因为缓冲区的大小不是 3 的整数倍\n# 而 \"S4\" 显然是可以的\narr3 = np.frombuffer(b, dtype=\"S4\")\nprint(arr3) # [b'abcd'] # 按照 int8 进行解析\narr4 = np.frombuffer(b, dtype=\"int8\")\nprint(arr4) # [ 97 98 99 100] # 按照 int16 进行解析\n# 显然 97 98 整体会被解析成一个整数，99 100 整体会被解析成一个整数\n# 你想到了什么，这不就类似于 Python 整数的底层实现嘛\n\"\"\"\n97 -> 01100001\n98 -> 01100010\n那么 97 98 组合起来就是 01100010_01100001 99 -> 01100011\n100 -> 01100100\n那么 99 100 组合起来就是 01100100_01100011\n\"\"\"\nprint(0b01100010_01100001) # 25185\nprint(0b01100100_01100011) # 25699\nprint(np.frombuffer(b, dtype=\"int16\")) # [25185 25699] # 按照 int32 来解析，显然这 4 个字节整体表示一个 int32\nprint(0b01100100_01100011_01100010_01100001) # 1684234849\nprint(np.frombuffer(b, dtype=\"int32\")) # [1684234849] 怎么样，是不是有点神奇呢？相信你在使用 numpy 的时候应该会有更加深刻的认识了，这就是缓冲区协议的威力。哪怕是不同的对象，只要都实现了缓冲区协议，那么彼此之间就可以暴露底层的缓冲区，从而实现共享内存。 所以 np.frombuffer 就是直接根据对象的缓冲区来创建数组，然后它底层的 buf 字段也指向这个缓冲区。但它不知道该如何解析这个缓冲区，所以我们需要显式地指定 dtype 来告诉它，相当于告诉它一些元信息。 那么问题来了，我们能不能修改缓冲区呢？ import numpy as np b = b\"abcd\"\narr = np.frombuffer(b, dtype=\"S1\") try: arr[0] = b\"A\"\nexcept ValueError as e: print(e) # assignment destination is read-only # 答案是不可以的，因为原始的 bytes 对象不可修改，所以缓冲区只读\n# 但我们真的就没办法了吗？还记得之前介绍的骚操作吗？\nfrom ctypes import * class PyBytesObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_shash\", c_ssize_t), (\"ob_sval\", 5 * c_byte), ]\nobj = PyBytesObject.from_address(id(b))\n# 修改缓冲区之前，打印 arr\nprint(arr) # [b'a' b'b' b'c' b'd']\n# 修改缓冲区之后，打印 arr\nobj.ob_sval[0] = ord(\"A\")\nprint(arr) # [b'A' b'b' b'c' b'd'] 我们看到由于共享缓冲区，所以修改 bytes 对象也会影响数组 arr，只是由于 bytes 对象不可变，我们只能出此下策。但其实还有一个办法，就是使用 bytearray 对象。 import numpy as np # 可以理解为可变的 bytes 对象\nb = bytearray(b\"abcd\")\narr = np.frombuffer(b, dtype=\"S1\") print(b) # bytearray(b'abcd')\n# 此时缓冲区是可修改的，并且修改任何一个对象都会影响另一个，因为它们共享同一个缓冲区\narr[0] = b\"A\"\n# 再次打印\nprint(b) # bytearray(b'Abcd') Py_buffer 的实现，也是 numpy 诞生的一个重要原因。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 详解缓冲区","id":"109","title":"详解缓冲区"},"11":{"body":"所谓定长和变长，取决于对象所占的内存大小是否固定，举个例子。 >>> import sys\n>>> sys.getsizeof(\"\")\n49\n>>> sys.getsizeof(\"hello\")\n54\n>>> sys.getsizeof(\"hello world\")\n60 >>> sys.getsizeof(1.0)\n24\n>>> sys.getsizeof(3.14)\n24\n>>> sys.getsizeof((2 << 30) + 3.14)\n24\n>>> 我们看到字符串的长度不同，所占的内存也不同，像这种内存大小不固定的对象，我们称之为变长对象；而浮点数所占的内存都是一样的，像这种内存大小固定的对象，我们称之为定长对象。 至于 Python 如何计算对象所占的内存，我们在剖析具体对象的时候会说，因为这涉及到底层对应的结构体。 所以变长对象的特点是：同一个类型的实例对象，如果值不同，那么占用的内存大小不同。像字符串、列表、元组、字典等，它们毫无疑问都是变长对象。值得一提的是，整数也是变长对象，因为 Python 整数的值在底层是通过数组维护的，后续介绍整数实现的时候再聊。 而定长对象的特点是：同一个类型的实例对象，不管值是多少，占用的内存大小始终是固定的，比如浮点数。因为 Python 的浮点数的值在 C 中是通过一个 double 来维护的。而 C 里面值的类型一旦确定，那么内存大小就不变了，所以 Python 浮点数的内存大小也是不变的。 但既然类型固定，内存大小固定，那么范围肯定是有限的。所以当浮点数不断增大，会牺牲精度来进行存储。 如果实在过大，则抛出 OverFlowError。 当然除了浮点数之外，布尔值、复数等也属于定长对象，它们占用的内存大小是固定的。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 定长对象和变长对象","id":"11","title":"定长对象和变长对象"},"110":{"body":"通过两个 bytes 对象相加，我们了解了什么是缓冲区、缓冲区协议，以及存在的作用，并且通过 numpy 进行了解释。了解缓冲区，可以让你更加深刻地理解 numpy。 下面再来总结一下： 如果一个类型对象实现了 tp_as_buffer，那么它的实例对象便支持缓冲区协议； tp_as_buffer 是一个函数指针，指向的函数负责初始化 Py_buffer； 在共享缓冲区的时候，比如 np.frombuffer(obj)，会直接调用 obj 的类型对象的 tp_as_buffer 字段指向的函数，拿到 Py_buffer 实例的 buf 字段指向的缓冲区。但 numpy 不知道该怎么解析这个缓冲区，所以还需要我们指定 dtype 参数。 缓冲区存在的最大意义就是共享内存，numpy 的数组在拷贝的时候，默认只拷贝 Py_buffer 实例，至于 Py_buffer 的 buf 字段指向的缓冲区默认是不会拷贝的。比如数组有 100 万个元素，这些元素都存储在缓冲区中，被 Py_buffer 的 buf 字段指向，拷贝的时候这 100 万个元素是不会拷贝的。 numpy 数组的维度、shape，是借助于 Py_buffer 中的元信息体现的，维度和 shape 不同，访问缓冲区元素的方式也不同。但存储元素的缓冲区，永远是一个一维数组，由 buf 字段指向。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 小结","id":"110","title":"小结"},"111":{"body":"bytes 对象是不可变对象，那么根据我们对浮点数的了解，可以大胆猜测 bytes 对象也有自己的缓存池。事实上确实如此，为了优化单字节 bytes 对象的创建效率，Python 底层维护了一个缓存池，该缓存池是一个 PyBytesObject * 类型的数组。 // Objects/bytesobject.c // 保存了 256 个单字节 bytes 对象，对应的 ASCII 码为 0 ~ 255\nstatic PyBytesObject *characters[UCHAR_MAX + 1];\n// 保存空 bytes 对象\nstatic PyBytesObject *nullstring; Python 内部创建单字节 bytes 对象时，会先检查目标对象是否已在缓存池中。PyBytes_FromString 函数是负责创建 bytes 对象的一个常用的 Python/C API，我们看一下它的逻辑。 // Objects/bytesobject.c // 基于 C 字符串创建 bytes 对象\nPyObject *\nPyBytes_FromString(const char *str)\n{ size_t size; // bytes 对象的长度 PyBytesObject *op; // 指向创建的 bytes 对象 assert(str != NULL); // 计算 C 字符串的长度，它和对应的 bytes 对象的长度是相等的 size = strlen(str); if (size > PY_SSIZE_T_MAX - PyBytesObject_SIZE) { PyErr_SetString(PyExc_OverflowError, \"byte string is too long\"); return NULL; } // 如果 size 等于 0，并且 nullstring 保存了空 bytes 对象，那么直接返回 if (size == 0 && (op = nullstring) != NULL) {\n#ifdef COUNT_ALLOCS _Py_null_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 如果 size 等于 1，比如 char *str = \"a\"，证明创建的是单字节对象 // 而 str 是字符串首元素的地址，所以 *str 会得到 'a'，即 97 // 假设 *str 是 97，那么 op 就是 bytes_characters[97] if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {\n#ifdef COUNT_ALLOCS _Py_one_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 否则创建新的 PyBytesObject 对象，此时是个空 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size); if (op == NULL) return PyErr_NoMemory(); // 初始化内部字段 (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); op->ob_shash = -1; // 将 C 字符串拷贝到 ob_sval 中 memcpy(op->ob_sval, str, size+1); // 如果 size == 0，说明创建的是空 bytes 对象，那么赋值给 nullstring if (size == 0) { nullstring = op; Py_INCREF(op); } else if (size == 1) { // 如果 size == 1，说明创建的是单字节 bytes 对象，那么放入到缓存池中 // 并且在缓存池中的索引，就是该字节对应的 ASCII 码 characters[*str & UCHAR_MAX] = op; Py_INCREF(op); } // 转成泛型指针之后返回 return (PyObject *) op;\n} 整体来说并不难，该 API 会将 C 字符串全部拷贝到 ob_sval 中。但如果 C 字符串长度为 10，而我们只希望基于前 n 个字符创建 bytes 对象，这时候可以使用 PyBytes_FromStringAndSize 函数。 PyBytes_FromString(\"Hello World\") 会返回 b\"Hello World\"。 PyBytes_FromStringAndSize(\"Hello World\", 5) 会返回 b\"Hello\"，如果传递的第二个参数 size 和 C 字符串长度相同，那么效果和 PyBytes_FromString 是等价的。 至于 PyBytes_FromStringAndSize 的逻辑和 PyBytes_FromString 类似，缓存池部分也是一样的，可以自己看一下。 当 Python 程序开始运行时，字节序列缓存池是空的。但随着单字节 bytes 对象的创建，缓存池中的对象慢慢多了起来。这样一来，单字节序列首次创建后便在缓存池中缓存起来，后续再使用时会直接从缓存池中获取，避免重复创建和销毁。与前面章节介绍的小整数对象池一样，字节序列缓存池也只能容纳为数不多的 256 个单字节序列，但使用频率非常高。 缓存池技术作为一种以空间换时间的优化手段，只需较小的内存为代价，便可明显提升执行效率。 >>> a1 = b\"a\"\n>>> a2 = b\"a\"\n>>> a1 is a2\nTrue\n>>>\n>>> a1 = b\"ab\"\n>>> a2 = b\"ab\"\n>>> a1 is a2\nFalse\n>>> 显然此时不需要解释了，单字节 bytes 对象会缓存起来，放到缓存池中。至于空字节 bytes 对象，则是由专门的 nullstring 变量保存，它们都是单例的。 到目前为止，关于 bytes 对象的内容就说完了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"26. 解密 bytes 对象的缓存池","id":"111","title":"26. 解密 bytes 对象的缓存池"},"112":{"body":"前面我们介绍了 bytes 对象，本篇文章来聊一聊 bytearray 对象，这两者都表示字节串或者字节序列，它们的创建方式和支持的操作也是类似的。 # 基于列表创建，里面的元素为 0 ~ 255 的整数\nb1 = bytes([97, 98, 99])\nb2 = bytearray([97, 98, 99])\nprint(b1)\nprint(b2)\n\"\"\"\nb'abc'\nbytearray(b'abc')\n\"\"\" # 基于字符串创建\nb1 = bytes(\"hello\", encoding='utf-8')\nb2 = bytearray(\"hello\", encoding='utf-8')\nprint(b1)\nprint(b2)\n\"\"\"\nb'hello'\nbytearray(b'hello')\n\"\"\" b1 = bytes.fromhex(\"61626364\")\nb2 = bytearray.fromhex(\"61626364\")\nprint(b1)\nprint(b2)\n\"\"\"\nb'abcd'\nbytearray(b'abcd')\n\"\"\" 但区别在于 bytes 对象是不可变对象，bytearray 对象是可变对象。 # 也可以直接基于 bytes 对象创建 bytearray 对象\n# 反过来也是如此\nb = bytearray(b\"satori\")\nprint(b) # bytearray(b'satori') # 既然是可变对象，那么就意味着可以本地修改内部元素\n# 由于字节序列内部的每个元素都是 0 ~ 255 的整数\n# 因此这里修改时，也必须赋值整数\nb[0] = ord(\"S\")\nprint(b) # bytearray(b'Satori') # 当然，如果基于切片修改，那么需要赋值一个 bytes 对象\nb[0: 2] = b\"SA\"\nprint(b) # bytearray(b'SAtori')\n# 当然也可以赋值一个 bytearray 对象\n# 它和 bytes 对象本质一样，无非是 bytes 对象不能本地修改\nb[0: 3] = bytearray(b\"saT\")\nprint(b) # bytearray(b'saTori') # 在尾部追加字节\nb.append(ord(\" \"))\nb.append(ord(\"h\"))\nb.append(ord(\"e\"))\nb.append(ord(\"l\"))\nb.append(ord(\"l\"))\nb.append(ord(\"o\"))\nprint(b) # bytearray(b'saTori hello') 还是那句话，如果不需要对字节序列做修改的话，那么 bytes 对象和 bytearray 对象是等价的，我们使用 bytes 对象即可。但若是希望字节序列可变，那么只能使用 bytearray 对象。 下面我们来分析一下 bytearray 对象的底层实现。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 楔子","id":"112","title":"楔子"},"113":{"body":"bytearray 对象在底层由 PyByteArrayObject 结构体表示，定义如下。 // Include/bytearrayobject.h typedef struct { PyObject_VAR_HEAD Py_ssize_t ob_alloc; char *ob_bytes; char *ob_start; int ob_exports;\n} PyByteArrayObject; 解释一下每个字段的含义： PyObject_VAR_HEAD：变长对象的公共头部，包含引用计数、类型和长度。 ob_alloc：底层缓冲区的长度，即最多能容纳多少个字节。注意它和 ob_size 的区别，ob_size 表示 bytearray 对象的长度，也就是缓冲区当前已经容纳了多少个字节。如果 append 的时候发现 ob_size 达到了 ob_alloc，那么要对缓冲区进行扩容。 ob_bytes：指向缓冲区的指针，缓冲区是一个连续的内存块，用于存储字节序列的所有数据。 ob_start：ob_bytes 指向缓冲区的物理起始位置，而 ob_start 指向缓冲区的逻辑起始位置。说白了 ob_start 可以指向缓冲区的任意位置，允许字节序列使用部分缓冲区，比如通过切片 [1:] 进行截取，那么 ob_start 便指向缓冲区的第二个元素（逻辑起始位置），而无需重新分配内存。 ob_exports：缓冲区被外部对象引用的次数。 下面我们来创建几个 bytearray 对象，并通过画图来描述对应的底层结构。 b = bytearray(b\"\") 每个结构体字段都是 8 字节，所以一个空 bytearray 对象的大小是 56 字节。 >>> b = bytearray()\n>>> b\nbytearray(b'')\n>>> b.__sizeof__()\n56 结果和我们分析的一样。 b = bytearray(b\"abc\") 由于缓冲区长度为 4，因此大小为 56 + 4 = 60 字节。 >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60 所以我们可以得出结论，bytearray 对象的大小等于 56 + 缓冲区的长度，在不发生扩容的情况下，缓冲区的长度等于 ob_size + 1。 >>> name = \"古明地觉\"\n>>> b = bytearray(name, encoding=\"utf-8\")\n>>> >>> 56 + len(name) * 3 + 1\n69\n>>> b.__sizeof__()\n69 但如果发生扩容会怎么样呢？ >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60\n# 添加一个元素\n>>> b.append(100)\n>>> b\nbytearray(b'abcd')\n>>> b.__sizeof__()\n63 添加一个元素之后，大小从 60 变成了 63，难道不应该是 61 吗？之所以出现这个现象，就是因为扩容的时候多申请了两个字节，我们画张图来展示一下这个过程。 以上就是 bytearray 对象的底层结构。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的底层实现","id":"113","title":"bytearray 对象的底层实现"},"114":{"body":"说完了 bytearray 对象的底层结构之后，再来看看它是怎么创建的？ // Objects/bytearrayobject.c PyObject *\nPyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)\n{ // 基于 C 的字符数组创建 bytearray 对象 // 参数 size 表示 bytearray 对象的长度 PyByteArrayObject *new; Py_ssize_t alloc; // size 必须大于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyByteArray_FromStringAndSize\"); return NULL; } // size 必须小于 PY_SSIZE_T_MAX if (size == PY_SSIZE_T_MAX) { return PyErr_NoMemory(); } // 为 PybyteArrayObject 申请内存，此处调用的是泛型 API new = PyObject_New(PyByteArrayObject, &PyByteArray_Type); // 申请失败返回 NULL if (new == NULL) return NULL; // 如果 size == 0，表示 bytearray 对象的长度为 0 // 那么将 ob_bytes 设置为 NULL，将 alloc 设置为 0 if (size == 0) { new->ob_bytes = NULL; alloc = 0; } else { // 否则将 alloc 设置为 size + 1，因为要多一个 '\\0' alloc = size + 1; // 申请 alloc 个字节的内存，赋值给 ob_bytes new->ob_bytes = PyObject_Malloc(alloc); // 为 NULL 表示申请失败，内存不足 if (new->ob_bytes == NULL) { Py_DECREF(new); return PyErr_NoMemory(); } // 将参数 bytes（这里是 C 字符串）拷贝到 ob_bytes 指向的缓冲区 // 在拷贝的时候，可以指定拷贝的长度，通过 size 参数指定 // 如果希望整个字符串全部拷贝，那么将 size 指定为 strlen(bytes) 即可 if (bytes != NULL && size > 0) memcpy(new->ob_bytes, bytes, size); // 将最后一个元素（索引为 size）设置为 '\\0' new->ob_bytes[size] = '\\0'; /* Trailing null byte */ } // 将 ob_size 字段初始化为 size Py_SIZE(new) = size; // 将 ob_alloc 字段初始化为 alloc new->ob_alloc = alloc; // ob_start 默认等于 ob_bytes new->ob_start = new->ob_bytes; // 缓冲区被引用的次数为 0，因为刚创建 new->ob_exports = 0; // 转成泛型指针之后返回 return (PyObject *)new;\n} 之前在创建 bytes 对象的时候介绍过 PyBytes_FromStringAndSize 这个函数，创建 bytearray 对象和它是类似的。但需要注意的是，bytes 对象和 bytearray 对象都实现了缓冲区，但这两者有一个区别。 bytes 对象的缓冲区存储在 PyBytesObject 结构体内部； bytearray 对象则不是这样，PyByteArrayObject 内部存储的是指针，指针指向了缓冲区； 我们回顾一下这两个结构体的定义。 PyBytesObject 里面的 ob_sval 是一个数组，而 PyByteArrayObject 的 ob_bytes 是一个指针。那为什么会出现这种情况呢？原因在这个系列的最开始就说过了，bytes 对象是不可变的，元素会直接存储在对应的结构体内部。 而 bytearray 对象是可变的，那么它内部只能存储指针，指针指向的内存区域负责存储元素。如果发生扩容，只需申请一片更大的内存区域并将元素拷贝过去，然后改变指针（ob_bytes）指向即可。至于 bytearray 对象本身的地址是不会发生任何变化的，它的扩容对引用它的变量来说是无感知的。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的创建","id":"114","title":"bytearray 对象的创建"},"115":{"body":"以上就是 bytearray 对象，关于它的具体操作就不赘述了，和 bytes 对象是类似的，可以自己尝试读一读。 总之在工作中，如果你不明确需要字节序列可变，那么使用 bytes 对象即可，否则使用 bytearray 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 小结","id":"115","title":"小结"},"116":{"body":"接下来我们将分析 Python 的字符串，这应该是使用频率最高的数据结构了，我们会通过多篇文章来详细阐述字符串的实现原理。 首先字符串是一个变长对象，因为不同长度的字符串所占的内存是不一样的。但同时字符串又是一个不可变对象，因为一旦创建就不可以再修改了。","breadcrumbs":"28. 字符集和字符编码 » 楔子","id":"116","title":"楔子"},"117":{"body":"我们知道计算机的存储单位是字节，一个字节可以表示 256 种字符，对于发明计算机的美国人来说足够了。因为英文字母算上大小写只有 52 个，即便再加上一些特殊字符，数量也不会超过 256 个，因此一个字节完全可以表示。 但随着计算机的普及，越来越多的非英文字符出现，导致一个字节已经无法表示了。所以只能曲线救国，对于一个字节无法表示的字符，使用多个字节表示，这便是多字节编码。而多字节编码也存在相应的问题，就是容易出现乱码。 到这里先不继续往下深入，我们先来理清楚一些概念。","breadcrumbs":"28. 字符集和字符编码 » 多字节编码","id":"117","title":"多字节编码"},"118":{"body":"估计有很多小伙伴搞不清这两者的区别，我们先来解释一下所谓的字符集和字符编码是怎么一回事？ 字符集：系统支持的所有字符组成的集合，像 ASCII、GB2312、Big5、unicode 都属于字符集。只不过不同的字符集所能容纳的字符个数不同，比如 ASCII 字符集不包含中文，unicode 则可以容纳世界上的所有字符； 多字节编码：负责将每个字符转成一个或多个计算机可以接受的具体数字，该数字可以理解为编号，因此字符编码维护了字符和编号之间的对应关系。而编码也分为多种，比如 ASCII、GBK、UTF-8 等等，字符编码不同，那么字符转换之后的编号也不同，当然能转化的字符种类也不同。比如 ASCII 这种字符编码，它就只能转换 ASCII 字符。 当然，ASCII 比较特殊，它既是字符集、也是字符编码。并且不管采用什么编码，ASCII 字符对应的编号永远是相同的。 将字符串中的每一个字符转成对应的编号，那么得到的就是字节序列（bytes 对象），因为计算机存储和网络通讯的基本单位都是字节，所以字符串必须以字节序列的形式进行存储或传输。 因此字符串和字节序列在某种程度上是很相似的，字符串按照指定的编码进行 encode 即可得到字节序列，也就是将每个字符都转成对应的编号；字节序列按照相同的编码 decode 即可得到字符串，也就是根据编号找到对应的字符。 比如我们写了一段文本，然后在存储的时候必须先进行 encode，也就是将每一个字符都转成一个或多个系统可以接受的数字、即对应的编号之后，才可以进行存储。 name = \"古明地觉\" print(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\"\nprint(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 采用不同的编码，得到的字节序列是不同的，比如使用 gbk 编码 encode，那么也必须使用 gbk 编码 decode。否则会因为无法解析而报错，因为字符编码不同，字符对应的编号也不同。 再比如每个国家都有自己的字符编码，你在日本的一台计算机上写好的文件拿到中国的计算机上打开，很有可能出现乱码。因为字符编码不同，字符和编号之间的对应关系也不同，采用不同的字符编码进行解析肯定会出问题。 但我们说，对于 ASCII 字符来说，由于不管采用哪一种编码，它们得到的编号都是固定的。所以编码对于 ASCII 字符来说，没有任何影响。 name = \"satori\" print(name.encode(\"gbk\"))\n\"\"\"\nb'satori'\n\"\"\"\nprint(name.encode(\"gbk\").decode(\"utf-8\"))\n\"\"\"\nsatori\n\"\"\" # 但如果是非 ASCII 字符，就不行了\ntry: \"你好\".encode(\"gbk\").decode(\"utf-8\")\nexcept UnicodeDecodeError as e: print(e) \"\"\" 'utf-8' codec can't decode byte 0xc4 in position 0: invalid continuation byte \"\"\" 这里再回忆一下 bytes 对象，创建的时候可以采用字面量的方式，比如 b\"abc\"，但是 b\"憨\" 却不可以。原因就是憨这个字符不是 ASCII 字符，那么采用不同的字符编码，其对应的编号是不同的。而解释器又不知道我们使用的是哪一种编码，所以不允许这么做，而是需要通过 \"憨\".encode() 的方式手动指定字符编码。 但对于 ASCII 字符而言，不管采用哪一种字符编码，得到的编号都是一样的， 所以 Python 针对 ASCII 字符则允许这种做法，比如 b\"abc\"。并且我们看到，对于汉字来说，在编码之后会对应多个编号，而每个编号占 1 字节，因此不同的字符所占的大小可能不同。","breadcrumbs":"28. 字符集和字符编码 » 字符集和字符编码","id":"118","title":"字符集和字符编码"},"119":{"body":"以上就是字符集和字符编码，字符集就是字符组成的集合，不同字符集所能容纳的字符数量是有限的。字符编码是将字符转成对应的编号，比如将一个字符串中的所有字符都转成对应的编号之后，就得到了字节序列。当然和字符集一样，字符编码能转换的字符种类也是有限的，像汉字我们可以使用 GBK 编码、UTF-8 编码，但是不能使用 ASCII 编码。 以上算是理清楚了一些概念，显然过于简单了，主要是为后面的内容做铺垫。那么下一篇文章，我们就从 Python 的角度来分析字符串的存储方式。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"28. 字符集和字符编码 » 小结","id":"119","title":"小结"},"12":{"body":"以上我们就分析了对象的种类，对象可以被分为可变对象和不可变对象，以及变长对象和定长对象。 不可变对象：对象不支持本地修改； 可变对象：对象支持本地修改； 变长对象：对象维护的值不同，占用的内存大小也不同； 定长对象：占用的内存大小始终固定； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 小结","id":"12","title":"小结"},"120":{"body":"上一篇文章我们介绍了字符集，它是一系列字符组成的集合，但不同的字符集所能容纳的字符是有限的。于是为了能将全世界的字符统一起来，便诞生了 unicode。 unicode 字符集对世界上出现的所有字符都进行了系统的整理，包括各种 emoji，不管是哪个国家的语言，都可以使用 unicode 字符集。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"て\")) # 12390 不管什么文字，都可以用一个 unicode 来表示，它们在字符集中对应一个唯一的码点。所谓码点，就是字符在字符集中的索引，或者说唯一编号。 但是问题来了，unicode 能表示这么多的字符，占用的内存一定不低吧。的确，根据当时的编码，一个 unicode 字符最高会占用到 4 字节，因此对西方人来说就有点苦不堪言了，明明一个字节就够用了，为啥需要那么多。于是又出现了 utf-8，它是为 unicode 提供的一个新的编码规则，具有可变长的功能。不同种类的字符占用的大小不同，比如英文字符使用一个字节存储，汉字使用 3 个字节存储，emoji 使用 4 个字节存储。 但 Python 在表示 unicode 字符串时，使用的却不是 utf-8 编码，至于原因我们下面来分析一下。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 楔子","id":"120","title":"楔子"},"121":{"body":"从 Python3 开始，字符串使用的是 unicode。而根据编码的不同，unicode 的每个字符最大可以占用 4 字节，从内存的角度来说，这种编码有时会比较昂贵。为了减少内存消耗并且提高性能，Python 的内部使用了三种编码方式来表示 unicode。 Latin-1 编码：每个字符占 1 字节; UCS2 编码：每个字符占 2 字节； UCS4 编码：每个字符占 4 字节； 在 Python 编程中，所有字符串的行为都是一致的，而且大多数时候我们都没有注意到差异。然而在处理大文本的时候，这种差异就会变得异常显著，甚至有些让人出乎意料。为了看到内部表示的差异，我们看一下字符串所占的内存大小。 >>> sys.getsizeof(\"a\")\n50\n>>> sys.getsizeof(\"憨\")\n76\n>>> sys.getsizeof(\"😂\")\n80 我们看到都是一个字符，但它们占用的内存却是不一样的。因为 Python 面对不同的字符会采用不同的编码，进而导致大小不同。但需要注意的是，Python 的每一个字符串都需要额外占用至少 49 个字节，因为要存储一些元数据，比如：公共的头部、哈希、长度、字节长度、编码类型等等。 import sys # 对于 ASCII 字符，一个占 1 字节，此时是 Latin-1 编码\nprint(sys.getsizeof(\"ab\") - sys.getsizeof(\"a\")) # 1 # 对于汉字，日文等等，一个占 2 字节，此时是 UCS2 编码\nprint(sys.getsizeof(\"憨憨\") - sys.getsizeof(\"憨\")) # 2\nprint(sys.getsizeof(\"です\") - sys.getsizeof(\"で\")) # 2 # 像 Emoji，则是一个占 4 字节 ，此时是 UCS4 编码\nprint(sys.getsizeof(\"😂😂\") - sys.getsizeof(\"😂\")) # 4 而采用不同的编码，底层结构体实例的元数据也会占用不同大小的内存。 # 所以一个空字符串占用 49 个字节\n# 此时会采用占用内存最小的 Latin-1 编码\nprint(sys.getsizeof(\"\")) # 49\n# 此时使用 UCS2\nprint(sys.getsizeof(\"憨\") - 2) # 74\n# UCS4\nprint(sys.getsizeof(\"🍌\") - 4) # 76 如果编码是 Latin-1，那么结构体实例的元数据会占 49 个字节；编码是 UCS2，占 74 个字节；编码是 UCS4，占 76 个字节。然后字符串所占的字节数就等于：元数据 + 字符个数 * 单个字符所占的字节。","breadcrumbs":"29. Python 是怎么存储字符串的？ » unicode 的三种编码","id":"121","title":"unicode 的三种编码"},"122":{"body":"上面提到的三种编码是 Python 在底层所使用的，但我们知道 unicode 还有一个 utf-8 编码，那 Python 为啥不用呢？ 先来抛出一个问题，我们知道 Python 支持通过索引查找一个字符串指定位置的字符（注意不是字节），比如 s[2] 查找的就是字符串 s 中的第 3 个字符。 s = \"古明地觉\"\nprint(s[2]) # 地 那么问题来了，通过索引查找字符串的某个字符，时间复杂度为 O(1)，那么 Python 是怎么通过索引瞬间定位到指定字符的呢？显然是通过指针的偏移，用索引乘上每个字符占的字节数，得到偏移量，然后从头部向后偏移指定数量的字节即可，这样就能在定位到指定字符的同时还保证时间复杂度为 O(1)。 但是这需要一个前提：字符串中每个字符所占的大小必须是相同的，如果字符占的大小不同，比如有的占 1 字节、有的占 3 字节，显然就无法通过指针偏移的方式了。这个时候若还想准确定位的话，只能按顺序对所有字符都逐个扫描，但这样的话时间复杂度肯定不是 O(1)，而是 O(n)。 我们以 Go 为例，Go 字符串默认就是使用的 utf-8 编码。 package main import \"fmt\" func main() { s := \"古明地觉\" fmt.Println(s[2]) // 164 fmt.Println(string(s[2])) // ¤\n} 惊了，我们看到打印的并不是我们希望的结果。因为 Go 底层使用的是 utf-8 编码，不同的字符可能会占用不同的字节。但 Go 通过索引定位的时间复杂度也是 O(1)，所以定位的时候是以字节为单位、而不是字符。在获取的时候也只会获取一个字节，而不是一个字符。 所以 s[2] 在 Go 里面指的是第 3 个字节，而不是第 3 个字符，而汉字在 utf-8 编码下占 3 个字节，所以 s[2] 指的就是汉字古的第三个字节。我们看到打印的时候，该字节的值为 164。 s = \"古明地觉\"\nprint(s.encode(\"utf-8\")[2]) # 164 这就是采用 utf-8 编码带来的弊端，它无法让我们以 O(1) 的时间复杂度去准确地定位字符，尽管它在存储的时候更省内存。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 为什么不使用 utf-8 编码","id":"122","title":"为什么不使用 utf-8 编码"},"123":{"body":"Python 会使用 3 种编码来表示 unicode，所占字节大小分别是 1、2、4 字节。 因此 Python 在创建字符串的时候会先扫描，尝试使用占字节数最少的 Latin-1 编码存储，但是范围肯定有限。如果发现存储不下的字符，只能改变编码，使用 UCS2，然后继续扫描。但如果又发现 UCS2 也无法存储的字符，因为两个字节最多表示 65535 个不同的字符，那么会再次改变编码，使用 UCS4。UCS4 占四个字节，肯定能存下了。 一旦改变编码，字符串中的所有字符都会使用同样的编码，因为它们不具备可变长功能。比如字符串 \"hello 古明地觉\"，肯定都会使用 UCS2，不存在 \"hello \" 使用 Latin-1，\"古明地觉\" 使用 UCS2，因为一个字符串只能有一个编码。 当通过索引获取的时候，会将索引乘上每个字符占的字节数，这样就能跳到准确位置上，因为字符串的所有字符占的字节都是一样的，然后获取的时候也会获取指定的字节数。比如使用 UCS2 编码，那么定位到某个字符的时候，会取两个字节，这样才能表示一个完整的字符。 import sys # 此时全部是 ascii 字符，那么 Latin-1 编码可以存储\n# 所以结构体实例的元数据占 49 个字节\ns1 = \"hello\"\n# 有 5 个字符，一个字符一个字节，所以加一起是 54 个字节\nprint(sys.getsizeof(s1)) # 54 # 出现了汉字，那么 Latin-1 肯定存不下，于是使用 UCS2\n# 所以结构体实例的元数据占 74 个字节\n# 但是别忘了此时的英文字符也是 UCS2，所以也是一个字符两字节\ns2 = \"hello憨\"\n# 6 个字符，74 + 6 * 2 = 86\nprint(sys.getsizeof(s2)) # 86 # 这个牛逼了，UCS2 也存不下，只能 UCS4 存储了\n# 所以结构体实例的元数据占 76 个字节\ns3 = \"hello憨🍌\"\n# 此时所有字符一个占 4 字节，总共 7 个字符\n# 76 + 7 * 4 = 104\nprint(sys.getsizeof(s3)) # 104 除此之外，我们再举一个例子更形象地证明这个现象。 import sys s1 = \"a\" * 1000\ns2 = \"a\" * 1000 + \"🍑\" # 我们看到 s2 只比 s1 多了一个字符\n# 但是两者占的内存，s2 却将近是 s1 的 4 倍。\nprint(sys.getsizeof(s1)) # 1049\nprint(sys.getsizeof(s2)) # 4080 s2 和 s1 的差别只是 s2 比 s1 多了一个字符，但就是这么一个字符导致 s2 比 s1 多占了 3031 个字节。然而这 3031 个字节不可能是多出来的字符所占的大小，什么字符一个会占到三千多个字节，这是不可能的。 尽管如此，它也是罪魁祸首，但前面的 1000 个字符也是共犯。我们说 Python 会根据字符串选择不同的编码，s1 全部是 ASCII 字符，所以 Latin1 能存下，因此一个字符只占一个字节，所以大小就是 49 + 1000 = 1049。 对于 s2，Python 发现前 1000 个字符 Latin1 能存下，但不幸的是最后一个字符存不下，于是只能使用 UCS4。而字符串的所有字符只能有一个编码，为了保证索引查找的时间复杂度为 O(1)，前面一个字节就能存下的字符，也需要用 4 字节来存储，这是 Python 的设计策略。 而使用 UCS4，结构体的元数据会占 76 个字节，因此 s2 的大小就是 76 + 1001 * 4 = 4080。 # 74 + 7 * 2 = 88\n>>> sys.getsizeof(\"爷的青春回来了\") 88 # 76 + 7 * 4 = 104\n>>> sys.getsizeof(\"👴的青春回来了\")\n104 字符数量相同但是占用内存大小不同，相信原因你肯定能分析出来。 所以如果字符串中的所有字符都是 ASCII 字符，则使用 1 字节 Latin1 编码。Latin1 能表示前 256 个 unicode 字符，它支持多种拉丁语，如英语、瑞典语、意大利语、挪威语。但是它们不能存储非拉丁语言，比如汉语、日语、希伯来语、西里尔语。这是因为它们的码点（数字索引）定义在 1 字节（0 ~ 255）范围之外。 大多数自然语言的文字都采用 2 字节（UCS2）编码，但当字符串包含特殊符号、Emoji 或稀有语言时，则使用 4 字节（UCS4）编码。unicode 标准有将近 300 个块（范围），你可以在 0XFFFF 块之后找到 4 字节块。 假设我们有一个 10G 的 ASCII 文本，想把它加载到内存中，但如果在文本中插入一个表情符号，那么字符串的大小将增加 4 倍。这是一个巨大的差异，你可能会在实践当中遇到，比如处理 NLP 问题。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"😁\")) # 128513 所以最著名和最流行的 unicode 编码都是 utf-8，但 Python 不在内部使用它，而是使用 Latin1、UCS2、UCS4。至于原因我们上面已经解释的很清楚了，主要是字符串的索引是基于字符，而不是字节。 当一个字符串使用 utf-8 编码存储时，每个字符会根据自身选择一个合适的大小，这是一种存储效率很高的编码，但它有一个明显的缺点。由于每个字符的字节长度可能不同，就导致无法按照索引瞬间定位到单个字符，即便能定位，也无法定位准确。如果想准，那么只能逐个扫描所有字符。 假设要对使用 utf-8 编码的字符串执行一个简单的操作，比如 s[5]，就意味着解释器需要扫描每一个字符，直到找到需要的字符，这样效率是很低的。但如果是固定长度的编码就没有这样的问题，所以当 Latin1 存储的 \"hello\"，在和 UCS2 存储的 \"古明地觉\" 组合之后，整体每一个字符都会向大的方向扩展，变成 2 字节。 这样定位字符的时候，只需要将 索引 * 2 便可计算出偏移的字节数，然后跳转该字节数即可。但如果原来的 \"hello\" 还是 1字节，而汉字是 2 字节，那么只通过索引是不可能定位到准确字符的，因为不同类型的字符的大小不同，必须要扫描整个字符串才可以。但是扫描字符串，效率又比较低，所以 Python 内部才会使用这个方法，而不是使用 utf-8。 因此对于 Go 来讲，如果想像 Python 一样，那么需要这么做： package main import \"fmt\" func main() { s := \"hello古明地觉\" // 我们看到长度为 17，因为使用 utf-8 编码，并且 len 函数统计的是字节的数量 fmt.Println(s, len(s)) // hello古明地觉 17 // 如果想像 Python 一样，那么可以使用 Go 提供的 rune，相当于 int32 // 此时每个字符均使用 4 个字节，所以长度变成了 9 r := []rune(s) fmt.Println(string(r), len(r)) // hello古明地觉 9 // 虽然打印的内容是一样的，但此时每个字符都使用 4 字节存储 // 此时跳转会偏移 5 * 4 个字节，然后获取也会获取 4 个字节，因为一个字符占 4 个字节 fmt.Println(string(r[5])) // 古\n} 由于 utf-8 编码的 unicode 字符串里面的字符可能占用不同的字节，显然没办法实现 Python 字符串的索引查找效果，因此 Python 没有使用 utf-8 编码。 Python 的做法是让字符串的所有字符都占用相同的字节，先使用占用内存最少的 Latin1，不行的话再使用 UCS2，还不行则使用 UCS4。但不管使用哪种编码，都会确保每个字符占用的字节是一样的。至于原因上面分析的很透彻了，因为无论是索引还是切片，还是计算长度等等，都是基于字符来的，显然这也符合人类的思维习惯。","breadcrumbs":"29. Python 是怎么存储字符串的？ » Latin-1、UCS2、UCS4 该使用哪一种","id":"123","title":"Latin-1、UCS2、UCS4 该使用哪一种"},"124":{"body":"以上就是 Python 字符串的存储策略，它并没有使用最为流行的 utf-8，归根结底就在于这种编码不适合 Python 字符串。当然，我们在将字符串转成字节序列的时候，一般使用的都是 utf-8 编码。 下一篇文章来介绍字符串的底层实现，看看字符串在底层是如何设计的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 小结","id":"124","title":"小结"},"125":{"body":"我们之前提到，字符串采用不同的编码，底层的结构体实例的元数据所占用的内存是不一样的。其实本质上是，字符串会根据编码的不同，而选择不同的存储结构。 PyASCIIObject：字符串仅包含 ASCII 字符； PyCompactUnicodeObject：字符串包含非 ASCII 字符，但可以紧凑表示； PyUnicodeObject：通用结构，可以表达所有类型的字符串（该结构不做讨论）； 需要强调的是，虽然 ASCII 字符占一字节，但只有码点小于 128 的字符才叫 ASCII 字符。 下面我们来分析一下。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 楔子","id":"125","title":"楔子"},"126":{"body":"unicode 会根据编码的不同而分为以下几类。 // Include/cpython/unicodeobject.h\nenum PyUnicode_Kind { // 所有字符的码点均位于 U+0000 ~ U+00FF PyUnicode_1BYTE_KIND = 1, // 所有字符的码点均位于 U+0000 ~ U+FFFF // 且至少有一个大于 U+00FF PyUnicode_2BYTE_KIND = 2, // 所有字符的码点均位于 U+0000 ~ U+10FFFF // 且至少有一个大于 U+FFFF PyUnicode_4BYTE_KIND = 4\n}; 而采用不同的编码，每个字符的大小也是不同的。 // Include/unicodeobject.h\ntypedef uint32_t Py_UCS4;\ntypedef uint16_t Py_UCS2;\ntypedef uint8_t Py_UCS1; Python 有一个内置函数 ord，可以查看字符的码点。 如果码点位于 0 ~ 255，那么使用 Py_UCS1，占 1 字节； 如果码点位于 256 ~ 65535，那么使用 Py_UCS2，占 2 字节； 如果码点大于 65535，那么使用 Py_UCS4，占 4 字节； 通过字符的范围，选择一个最合适的存储单元，从而节省内存。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » unicode 分类","id":"126","title":"unicode 分类"},"127":{"body":"如果字符串只包含 ASCII 字符，即字符的码点均小于 128，那么底层使用 PyASCIIObject 进行存储。 // Include/cpython/unicodeobject.h\ntypedef struct { // 对象的公共头部 PyObject_HEAD // 字符串的长度，充当了 ob_size Py_ssize_t length; // 哈希值，初始为 -1 Py_hash_t hash; struct { // 字符串是否开启 intern 机制，后续介绍 unsigned int interned:2; // 类型，标识每个存储单元的大小，可以有以下几种 // PyUnicode_1BYTE_KIND // PyUnicode_2BYTE_KIND // PyUnicode_4BYTE_KIND unsigned int kind:3; // 字符串是否紧凑表示，它是针对内存分配方案而言的 /* 紧凑的字符串由 PyASCIIObject 和 PyCompactUnicodeObject 表示 它的特点是对象和文本缓冲区是结合的，只需要一个内存块 */ /* 非紧凑的字符串由 PyUnicodeObject 表示（不是本文的重点） 它的特点是对象和文本缓冲区是分离的，需要两个内存块 一个负责存储 PyUnicodeObject 对象，另一个负责存储文本缓冲区 */ unsigned int compact:1; // 字符串是否只包含 ASCII 字符，如果是则为 1, 否则为 0 // 虽然一个字节可表示的范围是 0 ~ 255，但只有 0 ~ 127 之间的才是 ASCII 字符 unsigned int ascii:1; // 对象布局是否已完全初始化，不用关注 unsigned int ready:1; // 注意上面的字段名后面跟着 :数字，这是 C 语言的位域 // 比如 interned:2 表示使用 unsigned int 的前 2 个位 // 所以 struct state 结构体总共占 4 字节，因为所有字段共用 4 字节内存 // 上面总共使用了 8 个位，显然这里的 :24 负责占满 32 个位 unsigned int :24; } state; // 缓存宽字符格式（wide character）的字符串，无需关注，在之后的版本会被移除 wchar_t *wstr;\n} PyASCIIObject; 那么问题来了，实际的字符串文本数据存在了什么地方，我们没看到结构体里面有哪个字段负责存储文本啊。答案很简单，字符串文本会直接跟在 PyASCIIObject 结构体实例的后面，也就是紧凑表示。 我们以字符串 \"miu\" 为例，看一下它的底层结构。 注：为优化内存访问效率，结构体字段会进行内存对齐，所以 state 后面会多出一个 4 字节的空洞。 再来分析一下为什么一个空字符串会占 49 个字节，因为 ob_refcnt、ob_type、length、hash、wstr 都是 8 字节，加起来 40 字节。而 state 是 4 字节，但又留下了 4 字节的空洞，加起来也是 8 字节，所以总共占 40 + 8 = 48 个字节。然后还有一个 '\\0'，所以还要加上一个 1，总共 49 字节。 而对于 \"miu\" 这个 unicode 字符串来说，占的总字节数就是 49 + 3 = 52。 >>> import sys\n>>> sys.getsizeof(\"abc\")\n52 当字符串只包含 ASCII 字符时，由 PyASCIIObject 结构体表示，大小等于 49 + 字符串长度。当然啦，我们也可以认为大小等于 48 + (字符串长度 + 1)，这样理解起来更直观一些。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyASCIIObject","id":"127","title":"PyASCIIObject"},"128":{"body":"如果字符串包含了非 ASCII 字符，那么由 PyCompactUnicodeObject 结构体表示，假设字符串中码点最大的字符的码点为 maxchar。 if maxchar < 128: struct = PyASCIIObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 1\nelif maxchar < 256: struct = PyCompactUnicodeObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 0\nelif maxchar < 65536: struct = PyCompactUnicodeObject kind = PyUnicode_2BYTE_KIND # 2 ascii = 0\nelse: struct = PyCompactUnicodeObject kind = PyUnicode_4BYTE_KIND # 4 ascii = 0 看一下 PyCompactUnicodeObject 的底层结构。 // Include/cpython/unicodeobject.h\ntypedef struct { PyASCIIObject _base; // 字符串的 utf-8 编码长度 Py_ssize_t utf8_length; // 字符串使用 utf-8 编码的结果，这里是缓存起来从而避免重复的编码运算 char *utf8; // 宽字符的数量 Py_ssize_t wstr_length;\n} PyCompactUnicodeObject; PyCompactUnicodeObject 相当于在 PyASCIIObject 的基础上增加了 3 个字段，那么它实例的大小是多少呢？由于新增的三个字段，每个都是 8 字节，并且字符串文本会紧跟在 PyCompactUnicodeObject 的后面，所以大小一目了然。 PyCompactUnicodeObject 实例的大小等于 48 + 24 + (字符串长度 + 1) * 每个字符的大小，即 72 + (字符串长度 + 1) * 每个字符的大小 因此以后在看到一个字符串时，我们可以很轻松地计算出它的大小。 import sys\n# 只包含 ASCII 字符，那么结构体使用 PyASCIIObject\n# 这样的字符串所占的内存大小为 48 + (字符串长度 + 1)\nonly_ascii = \"satori\"\n# 所以结果是 48 + (6 + 1) = 55 字节\nprint(sys.getsizeof(only_ascii))\n\"\"\"\n55\n\"\"\" # 包含非 ASCII 字符，结构体使用 PyCompactUnicodeObject\n# 但所有字符的码点均小于 256，因此编码仍使用 Py_UCS1\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1)\nnon_ascii_with_ucs1 = \"sator¡\"\n# 所以结果是 72 + (6 + 1) = 79 字节\nprint(sys.getsizeof(non_ascii_with_ucs1))\n\"\"\"\n79\n\"\"\" # 字符的码点达到了 256，但小于 65536，因此编码使用 Py_UCS2\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 2\n# 注意：因为编码使用 Py_UCS2，那么 \\0 也要占两个字节\nnon_ascii_with_ucs2 = \"憨pi\"\n# 所以结果是 72 + (3 + 1) * 2 = 80\nprint(sys.getsizeof(non_ascii_with_ucs2))\n\"\"\"\n80\n\"\"\" # 字符的码点达到了 65536，因此编码使用 Py_UCS4\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 4\n# 因为编码使用 Py_UCS4，那么 \\0 也要占 4 个字节\nnon_ascii_with_ucs4 = \"🍌君\"\n# 所以结果是 72 + (2 + 1) * 4 = 84\nprint(sys.getsizeof(non_ascii_with_ucs4))\n\"\"\"\n84\n\"\"\" 所以随着编码的不同，一个 Python 字符串的元数据（包含 '\\0'）会占据不同的大小，假设字符串中码点最大的字符的码点为 maxchar。 如果 maxchar < 128，那么采用 Latin-1 编码，结构体为 PyASCIIObject，元数据的大小为 48 + 1 = 49。 如果 128 <= maxchar < 256，那么采用 Latin-1 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 1 = 73。 如果 256 <= maxchar < 65536，那么采用 USC2 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 2 = 74。 如果 maxchar >= 65536，那么采用 USC4 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 4 = 76。 所以我们之前说根据编码的不同，字符串的额外部分可能占据 49、74、76字节，这个结论其实不够准确，还漏掉了一个 73。因为 128 <= maxchar < 256 的字符串虽然不是 ASCII 字符串，但它仍然使用 Latin-1 编码，所以 '\\0' 占的是 1 字节，而不是 2 字节和 4 字节。 下面通过画图来描述一下这几个字符串的底层结构，由于 ASCII 字符串已经说过了，这里就不再赘述了。 non_ascii_with_ucs1 = \"sator¡\" 注意结尾的是字符 ¡，不是 i。 每个字符占一字节，所以大小是 72 + 7= 79 字节，然后 kind 为 PyUnicode_1BYTE_KIND。 import sys print(sys.getsizeof(\"sator¡\")) # 79 只有所有的字符的码点都小于 128，才叫 ASCII 字符串。而 ¡ 的码点是 161，所以 \"sator¡\" 不是 ASCII 字符串，但它的每个字符仍然只需一个字节存储。 non_ascii_with_ucs2 = \"憨pi\" 每个字符占两字节，所以大小是 72 + 4 * 2 = 80 字节，然后 kind 为 PyUnicode_2BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"憨pi\"))\n80 non_ascii_with_ucs4 = \"🍌君\" 每个字符占四字节，所以大小是 72 + 3 * 4 = 84 字节，然后 kind 为 PyUnicode_4BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"🍌君\"))\n84 以上我们就讨论了不同编码的字符串的底层结构，以及内存计算方式。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyCompactUnicodeObject","id":"128","title":"PyCompactUnicodeObject"},"129":{"body":"我们再来看一下解释器是怎么为字符串申请内存的，这个过程会调用 PyUnicode_New 函数。 该函数接收一个 size 参数和 maxchar 参数，负责申请容纳 size 个字符的 unicode 对象。而 maxchar 表示所有字符的码点中最大的那一个，对象的每个字符占多大空间，则基于 maxchar 进行判断。 // Objects/unicodeobject.c PyObject *\nPyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)\n{ // 声明相关变量 PyObject *obj; PyCompactUnicodeObject *unicode; void *data; enum PyUnicode_Kind kind; int is_sharing, is_ascii; Py_ssize_t char_size; Py_ssize_t struct_size; // 如果 size 为 0，返回空字符串，注：空字符串是单例的 if (size == 0 && unicode_empty != NULL) { Py_INCREF(unicode_empty); return unicode_empty; } is_ascii = 0; is_sharing = 0; struct_size = sizeof(PyCompactUnicodeObject); // 如果 maxchar 小于 128，说明全部是 ASCII 字符 // 此时结构体使用 PyASCIIObject if (maxchar < 128) { kind = PyUnicode_1BYTE_KIND; // kind 为 1 char_size = 1; // 字符大小为 1 is_ascii = 1; // 是 ASCII 字符串 struct_size = sizeof(PyASCIIObject); // 结构体大小 } // 否则说明字符串包含非 ASCII 字符，那么 is_ascii 为 0 // 此时结构体一律使用 PyCompactUnicodeObject else if (maxchar < 256) { // 如果 maxchar 小于 256，那么 kind 依旧为 1，字符大小为 1 kind = PyUnicode_1BYTE_KIND; char_size = 1; } else if (maxchar < 65536) { // 如果 maxchar 小于 65536，那么 kind 为 2，字符大小为 2 kind = PyUnicode_2BYTE_KIND; char_size = 2; if (sizeof(wchar_t) == 2) is_sharing = 1; } else { // 否则说明要采用 4 字节存储，此时 kind 为 4，字符大小为 4 // 注意：maxchar 也是有范围的，不能超过 0x10ffff // 不过目前也没有哪个字符的码点能超过这个值 if (maxchar > MAX_UNICODE) { PyErr_SetString(PyExc_SystemError, \"invalid maximum character passed to PyUnicode_New\"); return NULL; } kind = PyUnicode_4BYTE_KIND; char_size = 4; if (sizeof(wchar_t) == 4) is_sharing = 1; } // size 不能小于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyUnicode_New\"); return NULL; } // (size + 1) * char_size + struct_size 不能超过 PY_SSIZE_T_MAX if (size > ((PY_SSIZE_T_MAX - struct_size) / char_size - 1)) return PyErr_NoMemory(); // 为 Unicode 对象申请内存，如果返回 NULL 则说明申请失败 // 申请的内存不仅包含结构体本身，还有 size + 1 个字符，每个字符大小为 char_size // 从这里就体现出 \"紧凑\" 的含义了，因为结构体和字符串文本是结合的 obj = (PyObject *) PyObject_MALLOC(struct_size + (size + 1) * char_size); if (obj == NULL) return PyErr_NoMemory(); // 初始化引用计数和类型 obj = PyObject_INIT(obj, &PyUnicode_Type); if (obj == NULL) return NULL; // 将 obj 转成 PyCompactUnicodeObject * unicode = (PyCompactUnicodeObject *)obj; // 注：存储字符串文本的内存（可以理解为一个数组）紧跟在结构体后面 // 而下面的变量 data 会指向数组的首元素 // 那么问题来了，这是怎么做到的呢？我们解释一下，顺便回顾一下 C 的指针 // 假设有一个 int * 类型的指针 a，即 a 指向一个 int // 而 C 指针是可以运算的，a + 1 会指向下一个 int // 当然更准确的说，a + 1 会向后偏移 sizeof(int) 个字节 // 同理，如果 a 的类型是 ssize_t *，那么 a + 1 会向后偏移 sizeof(ssize_t) 个字节 if (is_ascii) // 此时我们就知道这里的代码是做什么的了，如果 is_ascii 等于 1 // 说明结构体是 PyASCIIObject，将泛型指针 obj 转成 PyASCIIObject * // 加 1 之后会向后偏移 sizeof(PyASCIIObject) 个字节 // 正好指向跟在 PyASCIIObject 结构体实例尾部的首个字符 data = ((PyASCIIObject*)obj) + 1; else // 否则说明结构体是 PyCompactUnicodeObject // 那么 unicode + 1 之后会向后偏移 sizeof(PyCompactUnicodeObject) 个字节 // 同样指向跟在 PyCompactUnicodeObject 结构体实例尾部的首个字符 data = unicode + 1; // 将 length 字段设置为 size _PyUnicode_LENGTH(unicode) = size; // 将 hash 字段初始化为 -1 _PyUnicode_HASH(unicode) = -1; // 将 state.interned 字段设置为 0 _PyUnicode_STATE(unicode).interned = 0; // 将 state.kind 字段设置为 kind _PyUnicode_STATE(unicode).kind = kind; // 将 state.compact 字段设置为 1 _PyUnicode_STATE(unicode).compact = 1; // 将 state.ready 字段设置为 1 _PyUnicode_STATE(unicode).ready = 1; // 将 state.ascii 字段设置为 is_ascii _PyUnicode_STATE(unicode).ascii = is_ascii; // 如果 is_ascii 等于 1，即字符串为 ASCII 字符串 // 将字符数组索引为 size 的元素设置为 '\\0' if (is_ascii) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; } // 否则说明结构体是 PyCompactUnicodeObject，还要多初始化两个字段 // 将 utf8 设置为 NULL，将 utf8_length 设置为 0 else if (kind == PyUnicode_1BYTE_KIND) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; _PyUnicode_WSTR_LENGTH(unicode) = 0; unicode->utf8 = NULL; unicode->utf8_length = 0; } // 结构体是 PyCompactUnicodeObject，并且 kind 不等于 PyUnicode_1BYTE_KIND else { unicode->utf8 = NULL; unicode->utf8_length = 0; // 如果 kind 等于 PyUnicode_2BYTE_KIND，说明每个字符要占 2 字节 // 将 data 转成 Py_UCS2 *，此时会用两个字节存储 '\\0' if (kind == PyUnicode_2BYTE_KIND) ((Py_UCS2*)data)[size] = 0; // 否则说明 kind 等于 PyUnicode_4BYTE_KIND，每个字符要占 4 字节 // 将 data 转成 Py_UCS4 *，此时会用四个字节存储 '\\0' else ((Py_UCS4*)data)[size] = 0; if (is_sharing) { _PyUnicode_WSTR_LENGTH(unicode) = size; _PyUnicode_WSTR(unicode) = (wchar_t *)data; } else { _PyUnicode_WSTR_LENGTH(unicode) = 0; _PyUnicode_WSTR(unicode) = NULL; } }\n#ifdef Py_DEBUG unicode_fill_invalid((PyObject*)unicode, 0);\n#endif assert(_PyUnicode_CheckConsistency((PyObject*)unicode, 0)); // 最后返回泛型指针 PyObject * return obj;\n} 通过字符串的内存申请，我们应该对底层结构有了更深刻的认识，说白了就是采用不同的编码，每个字符占用不同数量的字节。 另外 PyUnicode_New 主要负责申请内存，包括结构体本身以及指定数量的字符，至于具体的字符是什么则不得而知。因此 PyUnicode_New 一般会被其它 API 调用，当调用 PyUnicode_New 申请完内存之后，再对字符数组初始化。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 字符串的内存申请","id":"129","title":"字符串的内存申请"},"13":{"body":"在前面的文章中我们说到，面向对象理论中的类和对象这两个概念在 Python 内部都是通过对象实现的。类是一种对象，称为类型对象，类实例化得到的也是对象，称为实例对象。但是对象在 Python 的底层是如何实现的呢？Python 解释器是基于 C 语言编写的 ，但 C 并不是一个面向对象的语言，那么它是如何实现 Python 的面向对象的呢？ 首先对于人的思维来说，对象是一个比较形象的概念，但对于计算机来说，对象却是一个抽象的概念。它并不能理解这是一个整数，那是一个字符串，计算机所知道的一切都是字节。通常的说法是：对象是数据以及基于这些数据所能进行的操作的集合。在计算机中，一个对象实际上就是一片被分配的内存空间，这些内存可能是连续的，也可能是离散的。 而 Python 的任何对象在 C 中都对应一个结构体实例，在 Python 中创建一个对象，等价于在 C 中创建一个结构体实例。所以 Python 的对象，其本质就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。 下面我们就来分析一下对象在 C 中是如何实现的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 楔子","id":"13","title":"楔子"},"130":{"body":"以上就是字符串的底层结构，虽然字符串作为最基础的数据结构被大量使用，但它的底层实现却并不简单。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 小结","id":"130","title":"小结"},"131":{"body":"上一篇文章我们介绍了字符串的底层结构，看到里面有一个 state 字段，该字段也是一个结构体，内部定义了很多的标志位。 如果字符串的 interned 标志位大于 0，那么虚拟机将为其开启 intern 机制。那什么是 intern 机制呢？在 Python 中，某些字符串也可以像小整数对象池里的整数一样，共享给所有变量使用，从而通过避免重复创建来降低内存使用、减少性能开销，这便是 intern 机制。 Python 的做法是在虚拟机内部维护一个全局字典，所有开启 intern 机制的字符串均会保存在这里，后续如果需要使用的话，会尝试在全局字典中获取，从而实现避免重复创建的功能。 另外 intern 机制也分为多种。 // Include/cpython/unicode.h\n#define SSTATE_NOT_INTERNED 0\n#define SSTATE_INTERNED_MORTAL 1\n#define SSTATE_INTERNED_IMMORTAL 2 解释一下这几个字段： SSTATE_NOT_INTERNED：字符串未开启 intern 机制； SSTATE_INTERNED_MORTAL：字符串开启了 intern 机制，但它不是永久驻留的，在某些情况下可能会被回收； SSTATE_INTERNED_IMMORTAL：字符串开启了 intern 机制，会永远存活于内存中； 这些字段定义了字符串在内存管理中的不同驻留状态，从未驻留、短暂驻留到永久驻留，帮助优化字符串的内存使用和管理。 而当一个字符串要开启 intern 机制时，会调用 PyUnicode_InternInPlace 函数，看一下它的逻辑。 // Objects/unicodeobject.c void\nPyUnicode_InternInPlace(PyObject **p)\n{ PyObject *s = *p; PyObject *t; // 类型检查，因为 intern 共享机制只能用在字符串对象上 // PyUnicode_Check(s) -> isinstance(s, str) // PyUnicode_CheckExact(s) -> type(s) is str if (s == NULL || !PyUnicode_Check(s)) return; if (!PyUnicode_CheckExact(s)) return; // 执行到这儿，说明 s 一定指向字符串，那么检测它是否已经开启了 intern 机制 // 这个函数的逻辑很简单，内部会获取 state.interned，看它是否大于 0 // 如果已经被 intern 机制处理了，那么直接返回 if (PyUnicode_CHECK_INTERNED(s)) return; // 所有开启 intern 机制的字符串，都会保存在 interned 字典中 // 如果 interned 字典为空，那么创建 if (interned == NULL) { interned = PyDict_New(); if (interned == NULL) { PyErr_Clear(); /* Don't leave an exception */ return; } } // 将字符串同时作为 key 和 value 保存在 interned 字典中，即开启 intern 机制 // PyDict_SetDefault 对应字典的 setdefault 方法 t = PyDict_SetDefault(interned, s, s); if (t == NULL) { PyErr_Clear(); return; } // 注意这里有一个让人混淆的地方，首先 t 和 s 都是 C 指针 // 如果 t != s，说明它们指向了不同的字符串，如果 t == s，说明它们指向的是同一个字符串 // 由于 s 同时作为 key 和 value，那么不管 s 指向的字符串是否在字典中已存在 // PyObject_RichCompare(t, s, Py_EQ) 永远为真，也就是 t 和 s 指向的字符串的值是相等的 // 只是当 t != s 时，说明它们指向的不是同一个字符串，但值相等 // 这也意味着字典中已经存在某个 key，它指向的字符串维护了相同的文本数据 // 那么增加 t 指向的字符串的引用计数，减少 s 指向的字符串的引用计数 if (t != s) { Py_INCREF(t); Py_SETREF(*p, t); return; } // 否则说明 t == s，即 s 在字典中不存在，那么开启 interned 机制 Py_REFCNT(s) -= 2; _PyUnicode_STATE(s).interned = SSTATE_INTERNED_MORTAL;\n} 估计很多人都以为 Python 在创建字符串时，会先检测该字符串是否已经存在，如果有，就不用创建新的，这样可以节省空间。但其实不是这样的，事实上节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。 对于任何一个字符串，Python 总是会为它申请内存，尽管创建出来的字符串在 interned 字典中已经存在了（有另外的字符串对象维护了相同的文本）。而这正是关键所在，通常 Python 在运行时创建了一个字符串对象（假设叫 temp）之后，基本上都会调用 PyUnicode_InternInPlace 对 temp 进行处理。 如果维护的值已经存在于 interned 字典中，那么 temp 指向的对象的引用计数就会减 1，然后会因引用计数为 0 而被销毁，只是昙花一现，然后归于湮灭。 所以现在我们就明白了 intern 机制，并不是说先判断是否存在，如果存在，就不创建。而是先创建，然后发现已经有其它的字符串维护了一个与之相同的文本数据，于是 intern 机制再将引用计数减一，导致引用计数为 0，最终被回收。 然后关于字符串对象的 intern 机制，还有一点需要注意。实际上，被 intern 机制处理过后的字符串分为两类，一类处于 SSTATE_INTERNED_IMMORTAL 状态，另一类处于 SSTATE_INTERNED_MORTAL 状态，这两种状态的区别在 unicode_dealloc 中可以清晰的看到。SSTATE_INTERNED_IMMORTAL 状态的字符串是永远不会被销毁的，它与解释器共存亡。 而 PyUnicode_InternInPlace 只能创建 SSTATE_INTERNED_MORTAL 的字符串对象，如果想创建 SSTATE_INTERNED_IMMORTAL 对象，必须通过另外的接口来强制改变 intern 状态。 void\nPyUnicode_InternImmortal(PyObject **p)\n{ PyUnicode_InternInPlace(p); if (PyUnicode_CHECK_INTERNED(*p) != SSTATE_INTERNED_IMMORTAL) { _PyUnicode_STATE(*p).interned = SSTATE_INTERNED_IMMORTAL; Py_INCREF(*p); }\n} 但是问题来了，什么样的字符串才会开启 intern 机制呢？ 1）如果字符串为 ASCII 字符串，并且长度不超过 4096，那么会开启 intern 机制。 >>> s1 = \"a\" * 4096\n>>> s2 = \"a\" * 4096\n# 会开启 intern 机制，s1 和 s2 指向同一个字符串\n>>> s1 is s2\nTrue # 长度超过了 4096，所以不会开启 intern 机制\n>>> s1 = \"a\" * 4097\n>>> s2 = \"a\" * 4097\n>>> s1 is s2\nFalse 2）如果一个字符串只有一个字符，并且码点小于 256（一个字节可以表示），那么也会开启 intern 机制。 >>> hex(128)\n'0x80'\n# s1 和 s2 指向同一个字符串，因为开启了 intern 机制\n>>> s1 = chr(128)\n>>> s2 = \"\\x80\"\n>>> s1 is s2\nTrue # ASCII 字符指的是码点小于 128 的字符，显然 s1 和 s2 不是 ASCII 字符串\n# 虽然码点小于 256，但长度不等于 1，所以不会开启 intern 机制\n>>> s1 = chr(128) + \"x\"\n>>> s2 = chr(128) + \"x\"\n>>> s1 is s2\nFalse 实际上，存储单个字符这种方式有点类似于 bytes 对象的缓存池。是的，正如整数有小整数对象池、bytes 对象有字符缓存池一样，字符串也有其对应的缓存池。 总之 intern 机制并不是大家想的那样：先检测字符串是否已经存在，如果有，就不用创建新的，从而节省内存。但其实不是这样的，节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。对于任何一个字符串，解释器总是会为它创建对应的结构体实例，但如果发现创建出来的实例在 intern 字典中已经存在了，那么再将它销毁。 最后关于 intern 机制，在 Python 里面可以通过 sys.intern 函数强制开启。 >>> s1 = \"憨pi-_-||\"\n>>> s2 = \"憨pi-_-||\"\n>>> s1 is s2\nFalse\n>>> >>> s1 = sys.intern(\"憨pi-_-||\")\n>>> s2 = sys.intern(\"憨pi-_-||\")\n>>> s1 is s2\nTrue 以上就是字符串的 intern 机制，下一篇文章来介绍字符串的相关操作是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"31. 字符串的 intern 机制是怎么一回事？","id":"131","title":"31. 字符串的 intern 机制是怎么一回事？"},"132":{"body":"本文来说一说字符串的操作，字符串支持哪些操作，取决于类型对象 str，所以我们来看看 str 在底层的定义。 // Objects/unicodeobject.c\nPyTypeObject PyUnicode_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"str\", /* tp_name */ sizeof(PyUnicodeObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* Slots */ (destructor)unicode_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ unicode_repr, /* tp_repr */ &unicode_as_number, /* tp_as_number */ &unicode_as_sequence, /* tp_as_sequence */ &unicode_as_mapping, /* tp_as_mapping */ // ...\n} bytes 对象和 str 对象的很多行为都是相似的，str 对象可以 encode 成 bytes 对象，bytes 对象可以 decode 成 str 对象。 看一下三个操作簇，字符串都支持，但根据 bytes 对象的经验，我们猜测 tp_as_number 里面实现的函数只有取模，也就是格式化。 // Objects/unicodeobject.c // 不出所料，只实现了一个取模\nstatic PyNumberMethods unicode_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ unicode_mod, /*nb_remainder*/\n}; // 我们看到和 bytes 对象是几乎一样的\n// 因为 str 对象和 bytes 都是不可变的变长对象，并且可以相互转化\n// 因此它们的行为是高度相似的\nstatic PySequenceMethods unicode_as_sequence = { (lenfunc) unicode_length, /* sq_length */ PyUnicode_Concat, /* sq_concat */ (ssizeargfunc) unicode_repeat, /* sq_repeat */ (ssizeargfunc) unicode_getitem, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyUnicode_Contains, /* sq_contains */\n}; //也和 bytes 对象一样\nstatic PyMappingMethods unicode_as_mapping = { (lenfunc)unicode_length, /* mp_length */ (binaryfunc)unicode_subscript, /* mp_subscript */ (objobjargproc)0, /* mp_ass_subscript */\n}; 下面我们就通过源码来考察一下。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 楔子","id":"132","title":"楔子"},"133":{"body":"获取字符串的长度会执行 unicode_length 函数。 // Objects/unicodeobject.c\nstatic Py_ssize_t\nunicode_length(PyObject *self)\n{ if (PyUnicode_READY(self) == -1) return -1; return PyUnicode_GET_LENGTH(self);\n} // Include/cpython/unicodeobject.h\n#define PyUnicode_GET_LENGTH(op) \\ (assert(PyUnicode_Check(op)), \\ assert(PyUnicode_IS_READY(op)), \\ ((PyASCIIObject *)(op))->length) 比较简单，没什么可说的，length 字段维护的是字符串的长度。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 获取字符串的长度","id":"133","title":"获取字符串的长度"},"134":{"body":"字符串相加会执行 PyUnicode_Concat 函数，将两个字符串组合成一个新的字符串。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Concat(PyObject *left, PyObject *right)\n{ // 参数 left 和 right 指向两个要相加的字符串 // result 则指向相加之后的字符串 PyObject *result; // 还记得这个 Py_UCS4 吗，它是一个无符号 32 位整型 Py_UCS4 maxchar, maxchar2; // left 的长度、right 的长度、相加之后的长度 Py_ssize_t left_len, right_len, new_len; // 必须是两个字符串相加 if (ensure_unicode(left) < 0) return NULL; if (!PyUnicode_Check(right)) { PyErr_Format(PyExc_TypeError, \"can only concatenate str (not \\\"%.200s\\\") to str\", right->ob_type->tp_name); return NULL; } if (PyUnicode_READY(right) < 0) return NULL; // 如果 left 指向空字符串，直接返回 right if (left == unicode_empty) return PyUnicode_FromObject(right); // 如果 right 指向空字符串，直接返回 left if (right == unicode_empty) return PyUnicode_FromObject(left); // 获取两个字符串的长度 left_len = PyUnicode_GET_LENGTH(left); right_len = PyUnicode_GET_LENGTH(right); // 如果相加的之后的长度超过了 PY_SSIZE_T_MAX，那么报错 if (left_len > PY_SSIZE_T_MAX - right_len) { PyErr_SetString(PyExc_OverflowError, \"strings are too large to concat\"); return NULL; } // 计算相加之后的字符串的长度 new_len = left_len + right_len; // 解释一下 PyUnicode_MAX_CHAR_VALUE，它的逻辑很简单 /* 如果是 ASCII 字符串，返回 0x7f * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0xff * 如果 kind 等于 PyUnicode_2BYTE_KIND，返回 0xffff * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0x10ffff */ // 所以该函数计算的就是字符串使用的编码所能表示的最大范围 maxchar = PyUnicode_MAX_CHAR_VALUE(left); maxchar2 = PyUnicode_MAX_CHAR_VALUE(right); // 显然要取 maxchar 和 maxchar2 之间两者较大的那一个 maxchar = Py_MAX(maxchar, maxchar2); // PyUnicode_New 我们之前介绍过，它负责为字符串申请内存 // new_len 表示要容纳多少个字符 // maxchar 表示字符的最大码点，内部会基于 maxchar 选择一个合适的编码 result = PyUnicode_New(new_len, maxchar); if (result == NULL) return NULL; // _PyUnicode_FastCopyCharacters 负责字符串之间的拷贝，它的原型如下： /* void _PyUnicode_FastCopyCharacters(PyObject *to, Py_ssize_t to_start, PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many) 如果用 Python 代码举例的话，那么该函数所做的事情就等价于如下： for i in range(how_many): to[to_start + i] = from[from_start + i] */ // 相当于 result[0: left_len] = left[0: left_len] _PyUnicode_FastCopyCharacters(result, 0, left, 0, left_len); // 相当于 result[left_len: left_len + right_len] = right[0: right_len] _PyUnicode_FastCopyCharacters(result, left_len, right, 0, right_len); assert(_PyUnicode_CheckConsistency(result, 1)); return result;\n} 可以看到逻辑还是很清晰的，不过和 bytes 对象不同，字符串没有实现缓冲区。但是在操作上，和 bytes 对象是类似的，如果有大量的字符串相加，那么效率会非常低下，官方建议是通过 join 的方式。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的相加","id":"134","title":"字符串的相加"},"135":{"body":"序列型对象除了拥有 tp_as_sequence 里面的方法之外，还可以有很多自定义方法，比如字符串可以转大小写，列表可以追加元素等等。下面来聊一聊字符串的自定义方法，在介绍类型对象的时候说过，实例对象的自定义方法都会放在类型对象的 tp_methods 字段里面。 tp_methods 字段的类型是 PyMethodDef 结构体数组，一个 PyMethodDef 结构体实例对应一个可调用方法。那么 PyMethodDef 长什么样子呢？ // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 包含具体实现的 C 函数 PyCFunction ml_meth; // 函数的参数类型 // 比如函数接收多少参数，是否支持关键字参数， // 是不是静态方法、类方法等等，这些都需要通过 ml_flags 指定 int ml_flags; // 函数的 docstring const char *ml_doc; }; 字符串的自定义方法非常多，我们先从 Python 的角度罗列一下，然后再挑几个看一下源码实现。 # 字符串转小写\nprint(\"ABC\".lower()) # abc # 字符串转大写\nprint(\"abc\".upper()) # ABC # 每个单词首字母大写，其它字母小写\nprint(\"my GRIL\".title()) # My Gril # 第一个单词首字母大写，其它字母小写\nprint(\"MY GIRL\".capitalize()) # My girl # 从字符两端开始去除指定的字符，比如位于 \"001\" 的字符会被去除\nprint(\"001古明地觉 1 号001\".strip(\"001\")) # 古明地觉 1 号\n# 也可以只从一端去除\nprint(\"001古明地觉 1 号001\".lstrip(\"001\")) # 古明地觉 1 号001\nprint(\"001古明地觉 1 号001\".rstrip(\"001\")) # 001古明地觉 1 号 # 查找指定的子串，返回子串第一次出现的位置\nprint(\"abcabcabc\".index(\"bca\")) # 1\n# 查找时也支持指定范围，比如从索引为 2 的位置开始查找\nprint(\"abcabcabc\".index(\"bca\", 2)) # 4 # index 方法如果在没有找到指定的子串时，会抛出 ValueError:\n# 如果不希望报错，那么可以使用 find，当字符串不存在时会返回 -1\nprint(\"hello\".find(\"ll\")) # 2\nprint(\"hello\".find(\"lll\")) # -1\n# find 也支持指定查找范围，并且是从左往右查找\n# 如果使用 rfind，则可以实现从右往左查找，同理还有 rindex\nprint(\"abc abc\".find(\"abc\")) # 0\nprint(\"abc abc\".rfind(\"abc\")) # 4 # 统计指定子串的数量\nprint(\"abc abc abc\".count(\"abc\")) # 3 # 是否以某个字符串开头\nprint(\"Hello\".startswith(\"Hel\")) # True\nprint(\"Hello\".startswith(\"hel\")) # False # 是否以某个字符串结尾\nprint(\"world\".endswith(\"rld\")) # True\nprint(\"world\".endswith(\"rlD\")) # False # 按照指定字符串进行分割，并支持传入 maxsplit 参数指定最大分割次数\nprint(\"a-b-c-d-e\".split(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".split(\"-\", 2)) # ['a', 'b', 'c-d-e']\n# 如果不传递参数，那么会默认按照空白符（包含空格、Tab、换行等等）分隔\nprint(\"a \\n b \\tc\".split()) # ['a', 'b', 'c']\n# 还可以从右向左分割，当然在不指定 maxsplit 参数时，效果和 split 一样\nprint(\"a-b-c-d-e\".rsplit(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".rsplit(\"-\", 2)) # ['a-b-c', 'd', 'e'] # 等价于 .split(\"\\n\")\nprint(\"a b\\nc\".splitlines()) # ['a b', 'c'] # 按照指定子串进行分割，返回一个三元组：(子串之前的部分, 子串, 子串之后的部分)\nprint(\"abcxxdef\".partition(\"xx\")) # ('abc', 'xx', 'def')\n# 当子串不存在时，会返回 (字符串本身, \"\"， \"\")\nprint(\"abc\".partition(\"xx\")) # ('abc', '', '') # 大小写交换\nprint(\"Hello World\".swapcase()) # hELLO wORLD # 对指定子串进行替换\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\")) # ABC ABC ABC\n# 也可以指定最大替换次数\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\", 2)) # ABC ABC abc # 和 replace 作用相似，也是用来替换字符串指定部分\n# 将 a 替换成 abc，将 x 替换成 xyz\ntrans = str.maketrans({\"a\": \"abc\", \"x\": \"xyz\"})\nprint(\"aaxx\".translate(trans)) # abcabcxyzxyz\n# 如果给 str.maketrans 只传一个参数，那么要传字典，并且 key 必须是单字符\n# 如果给 str.maketrans 传递两个参数，那么两个参数必须是等长的字符串\ntrans = str.maketrans(\"abc\", \"ABC\")\n# a -> A，b -> B，c -> C\nprint(\"abccc\".translate(trans)) # ABCCC\n# 如果传三个参数，那么第三个参数也要是字符串\n# 此时在替换的时候，还会去除掉位于 \"def\" 中的字符\ntrans = str.maketrans(\"abc\", \"ABC\", \"def\")\nprint(\"abcdefabc\".translate(trans)) # ABCABC 这些都属于基础内容了，我们挑几个看一下源码实现。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的自定义方法","id":"135","title":"字符串的自定义方法"},"136":{"body":"字符串在相加时会创建一个新的字符串，所以如果有大量的字符串相加，那么效率会很低下。面对这种情况，官方的建议是通过 join 方法。 字符串的 join 方法在底层对应 PyUnicode_Join 函数。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Join(PyObject *separator, PyObject *seq)\n{ PyObject *res; // 拼接结果 PyObject *fseq; // 拼接的字符串的数量 Py_ssize_t seqlen; // 总长度 PyObject **items; // PyObject * 数组首元素的地址 // 遍历参数 seq，将里面的每个字符串拿出来放在列表中 // 如果 seq 本身就是列表或元组，那么直接返回 seq fseq = PySequence_Fast(seq, \"can only join an iterable\"); if (fseq == NULL) { return NULL; } // 列表或元组对应的结构体内部都有一个 ob_item 字段 // 该字段是一个 PyObject * 类型的数组，负责保存具体的元素 // 该函数会拿到 ob_item 数组，并赋值给 items items = PySequence_Fast_ITEMS(fseq); // 获取要拼接的字符串的数量 seqlen = PySequence_Fast_GET_SIZE(fseq); // 调用 _PyUnicode_JoinArray 进行拼接 res = _PyUnicode_JoinArray(separator, items, seqlen); Py_DECREF(fseq); return res;\n} 核心在 _PyUnicode_JoinArray 函数里面，该函数的逻辑很长，但很简单。就是获取要拼接的每一个字符串的长度，然后加在一起，并取最大的存储单元，然后一次性申请对应的内存空间，再逐一进行拷贝。所以拷贝是避免不了的，+ 这种方式导致低效率的主要原因就在于大量临时字符串的创建和销毁。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 join","id":"136","title":"字符串的 join"},"137":{"body":"在 Python 里面可以调用字符串的 encode 方法，得到 bytes 对象。那么它在底层是如何实现的呢？ // Objects/unicodeobject.c\nPyObject *\nPyUnicode_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors)\n{ PyObject *v; char buflower[11]; // unicode 参数要指向一个字符串 if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } // 如果不指定编码，那么使用 UTF-8 if (encoding == NULL) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果指定了编码，那么进行判断 if (_Py_normalize_encoding(encoding, buflower, sizeof(buflower))) { char *lower = buflower; /* Fast paths */ // 快分支，判断是否是 UTF-* 系列 if (lower[0] == 'u' && lower[1] == 't' && lower[2] == 'f') { lower += 3; if (*lower == '_') { /* Match \"utf8\" and \"utf_8\" */ lower++; } // 如果是 UTF-8 if (lower[0] == '8' && lower[1] == 0) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果是 UTF-16 else if (lower[0] == '1' && lower[1] == '6' && lower[2] == 0) { return _PyUnicode_EncodeUTF16(unicode, errors, 0); } // 如果是 UTF-32 else if (lower[0] == '3' && lower[1] == '2' && lower[2] == 0) { return _PyUnicode_EncodeUTF32(unicode, errors, 0); } } // 否则判断是否是 ascii、latin1、iso8859-1 等编码 else { if (strcmp(lower, \"ascii\") == 0 || strcmp(lower, \"us_ascii\") == 0) { return _PyUnicode_AsASCIIString(unicode, errors); }\n#ifdef MS_WINDOWS else if (strcmp(lower, \"mbcs\") == 0) { return PyUnicode_EncodeCodePage(CP_ACP, unicode, errors); }\n#endif else if (strcmp(lower, \"latin1\") == 0 || strcmp(lower, \"latin_1\") == 0 || strcmp(lower, \"iso_8859_1\") == 0 || strcmp(lower, \"iso8859_1\") == 0) { return _PyUnicode_AsLatin1String(unicode, errors); } } } // 如果以上编码都不是，那么执行通用逻辑 _PyCodec_EncodeText v = _PyCodec_EncodeText(unicode, encoding, errors); if (v == NULL) return NULL; /* The normal path */ if (PyBytes_Check(v)) return v; /* If the codec returns a buffer, raise a warning and convert to bytes */ if (PyByteArray_Check(v)) { int error; PyObject *b; error = PyErr_WarnFormat(PyExc_RuntimeWarning, 1, \"encoder %s returned bytearray instead of bytes; \" \"use codecs.encode() to encode to arbitrary types\", encoding); if (error) { Py_DECREF(v); return NULL; } b = PyBytes_FromStringAndSize(PyByteArray_AS_STRING(v), PyByteArray_GET_SIZE(v)); Py_DECREF(v); return b; } PyErr_Format(PyExc_TypeError, \"'%.400s' encoder returned '%.400s' instead of 'bytes'; \" \"use codecs.encode() to encode to arbitrary types\", encoding, Py_TYPE(v)->tp_name); Py_DECREF(v); return NULL;\n} 由于现在的主流编码是 utf-8，所以绝大部分情况都会执行 _PyUnicode_AsUTF8String 函数，我们看一下它的逻辑。 // Objects/unicodeobject.c\nPyObject *\n_PyUnicode_AsUTF8String(PyObject *unicode, const char *errors)\n{ return unicode_encode_utf8(unicode, _Py_ERROR_UNKNOWN, errors);\n} static PyObject *\nunicode_encode_utf8(PyObject *unicode, _Py_error_handler error_handler, const char *errors)\n{ enum PyUnicode_Kind kind; void *data; Py_ssize_t size; if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } if (PyUnicode_READY(unicode) == -1) return NULL; // 如果是 ASCII 字符串，那么直接获取每个字符的码点，创建 bytes 对象 if (PyUnicode_UTF8(unicode)) return PyBytes_FromStringAndSize(PyUnicode_UTF8(unicode), PyUnicode_UTF8_LENGTH(unicode)); // 获取字符串的 kind kind = PyUnicode_KIND(unicode); // 获取首字符的地址，首字符紧跟在结构体后面 data = PyUnicode_DATA(unicode); // 获取字符串的长度 size = PyUnicode_GET_LENGTH(unicode); // 判断 kind 种类 switch (kind) { default: Py_UNREACHABLE(); case PyUnicode_1BYTE_KIND: // 基于不同 kind 调用不同的函数 assert(!PyUnicode_IS_ASCII(unicode)); return ucs1lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_2BYTE_KIND: return ucs2lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_4BYTE_KIND: return ucs4lib_utf8_encoder(unicode, data, size, error_handler, errors); }\n} 整个过程还是我们之前说的，通过 utf-8 编码将每个字符转成对应的编号，组合起来得到的就是 bytes 对象。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 encode","id":"137","title":"字符串的 encode"},"138":{"body":"到目前为止，我们就说完了字符串相关的内容。必须要强调的是，字符串没有想象中的那么简单，而在 CPython 里面，字符串的源码将近两万行。 如果你还对字符串的其它操作感兴趣，想看看它的具体实现，可以自己深入源码探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 小结","id":"138","title":"小结"},"139":{"body":"本篇文章来分析一下列表，在初学列表的时候，可能书上会告诉你列表就是一个大仓库，什么都可以存放。但在最开始的几个章节中，我们花了很大的笔墨介绍了 Python 的对象，并明白了变量的本质。所以到现在列表已经没有什么好神秘的了，它里面存放的元素其实都是泛型指针 PyObject *。 并且根据我们使用列表的经验，可以得出以下两个结论： 每个列表的元素个数可以不一样，所以它是一个变长对象 可以对列表进行添加、删除、修改等操作，所以它是一个可变对象","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 楔子","id":"139","title":"楔子"},"14":{"body":"Python 一切皆对象，而所有的对象都拥有一些共同的信息（也叫头部信息），这些信息位于 PyObject 中，它是 Python 对象机制的核心，下面来看看它的定义。 // Include/object.h typedef struct _object { _PyObject_HEAD_EXTRA Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 首先解释一下结构体里面的 _PyObject_HEAD_EXTRA，这是一个宏，定义如下。 // Include/object.h // 如果定义了宏 Py_TRACE_REFS\n#ifdef Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 会展开成如下两个字段\n// 显然程序中创建的对象会组成一个双向链表\n#define _PyObject_HEAD_EXTRA \\ struct _object *_ob_next; \\ struct _object *_ob_prev;\n// 用于将 _ob_next 和 _ob_prev 初始化为空\n#define _PyObject_EXTRA_INIT 0, 0,\n// 否则说明没有定义宏 Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 和 _PyObject_EXTRA_INIT 不会有任何作用\n#else\n#define _PyObject_HEAD_EXTRA\n#define _PyObject_EXTRA_INIT\n#endif 所以如果定义了宏 Py_TRACE_REFS，那么展开之后 PyObject 就是下面这样。 typedef struct _object { PyObject *_ob_next; PyObject *_ob_prev; Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 但 Py_TRACE_REFS 一般只在编译调试的时候会开启，我们从官网下载的都是 Release 版本，不包含这个宏，因此这里我们也不考虑它。所以 PyObject 最终就等价于下面这个样子： typedef struct _object { Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 所以 PyObject 里面包含了两个字段，分别是 ob_refcnt 和 ob_type。 ob_refcnt 表示对象的引用计数，当对象被引用时，ob_refcnt 会自增 1；引用解除时，ob_refcnt 会自减 1。而当对象的引用计数为 0 时，则会被回收。 那么在哪些情况下，引用计数会加 1 呢？哪些情况下，引用计数会减 1 呢？ 引用计数加 1 的情况： 对象被创建：比如 name = \"古明地觉\"，此时对象就是 \"古明地觉\" 这个字符串，创建成功时它的引用计数为 1； 变量传递使得对象被新的变量引用：比如 name2 = name； 引用该对象的某个变量作为参数传递到一个函数或者类中：比如 func(name)； 引用该对象的某个变量作为元组、列表、集合等容器的元素：比如 lst = [name]； 引用计数减 1 的情况： 引用该对象的变量被显式地销毁：del name； 引用该对象的变量指向了别的对象：name = \"\"； 引用该对象的变量离开了它的作用域，比如函数的局部变量在函数执行完毕时会被删除； 引用该对象的变量所在的容器被销毁，或者变量从容器里面被删除； 因为变量只是一个和对象绑定的符号，更接地气一点的说法就是，变量是个便利贴，贴在指定的对象上面。所以 del 变量 并不是删除变量指向的对象，而是删除变量本身，可以理解为将对象身上的便利贴给撕掉了，其结果就是对象的引用计数减一。至于对象是否被删除（回收）则是解释器判断其引用计数是否为 0 决定的，为 0 就删，不为 0 就不删，就这么简单。 然后看一下字段 ob_refcnt 的类型，该类型为 Py_ssize_t，它是 ssize_t 的别名，在 64 位机器上等价于 int64。因此一个对象的引用计数不能超过 int64 所能表示的最大范围。但很明显，如果不费九牛二虎之力去写恶意代码，是不可能超过这个范围的。 说完了 ob_refcnt，再来看看 PyObject 的另一个字段 ob_type，相信你能猜到它的含义。对象是有类型的，类型对象描述实例对象的行为，而 ob_type 存储的便是对应的类型对象的指针，所以类型对象在底层是一个 struct _typeobject 结构体实例。另外 struct _typeobject 还有一个类型别名叫 PyTypeObject，关于类型对象，我们后续再聊。 以上就是 PyObject，它的定义非常简单，就一个引用计数和一个类型对象的指针。这两个字段的大小都是 8 字节，所以一个 PyObject 结构体实例的大小是 16 字节。由于 PyObject 是所有对象都具有的，换句话说就是所有对象对应的结构体都内嵌了 PyObject，因此你在 Python 里面看到的任何一个对象都有引用计数和类型这两个属性。 >>> num = 666 >>> sys.getrefcount(num)\n2\n>>> num.__class__\n<class 'int'> >>> sys.getrefcount(sys)\n56\n>>> sys.__class__\n<class 'module'> >>> sys.getrefcount(sys.path)\n2\n>>> sys.path.__class__\n<class 'list'> >>> def foo(): pass\n... >>> sys.getrefcount(foo)\n2\n>>> foo.__class__\n<class 'function'> 引用计数可以通过 sys.getrefcount 函数查看，类型可以通过 type(obj) 或者 obj.__class__ 查看。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 对象的地基：PyObject","id":"14","title":"对象的地基：PyObject"},"140":{"body":"列表在底层由 PyListObject 结构体表示，看一下它长什么样子。 // Include/listobject.h\ntypedef struct { PyObject_VAR_HEAD /* Vector of pointers to list elements. list[0] is ob_item[0], etc. */ PyObject **ob_item; /* ob_item contains space for 'allocated' elements. The number * currently in use is ob_size. * Invariants: * 0 <= ob_size <= allocated * len(list) == ob_size * ob_item == NULL implies ob_size == allocated == 0 * list.sort() temporarily sets allocated to -1 to detect mutations. * * Items must normally not be NULL, except during construction when * the list is not yet visible outside the function that builds it. */ Py_ssize_t allocated;\n} PyListObject; 我们看到里面有如下字段： PyObject_VAR_HEAD：变长对象的公共头部信息； ob_item：一个二级指针，指向 PyObject * 数组的首元素，这个指针数组保存的便是对象的指针，而操作数组都是通过 ob_item 来进行操作的； allocated：容量，我们知道列表底层使用了 C 的数组，而底层数组的长度就是列表的容量； 列表之所以要有容量的概念，是因为列表可以动态添加元素，但底层的数组在创建完毕之后，其长度却是固定的。所以当添加新元素时，发现数组已经满了，这个时候只能申请一个更长的数组，同时把原来数组中的元素依次拷贝到新数组里面（这一过程就是列表的扩容），然后再将新元素添加进去。 但是问题来了，总不可能每添加一个元素，就申请一次数组、将所有元素都拷贝一次吧。所以列表在扩容的时候，会将数组申请的长一些，从而在添加元素的时候不用每次都申请新的数组。 这便是列表的结构示意图，我们看到底层数组的长度为 4，说明此时列表的容量为 4。但是里面有 3 个 PyObject * 指针，说明列表的 ob_size 是 3，或者说列表里面有 3 个元素。 如果这个时候我们往列表中 append 一个元素，那么会将这个新元素设置在数组索引为 ob_size 的位置、或者说第四个位置。一旦设置完，ob_size 会自动加 1，因为 ob_size 要和列表的长度保持一致。 列表的容量是 4，但此时长度也达到了 4，所以列表的长度、或者说元素个数已经达到了容量。这说明当下一次 append 的时候，已经没有办法再容纳新的元素了。当然最直观的还是这里的底层数组，很明显全都占满了。那这个时候如果想再接收新的元素的话，要怎么办呢？显然只能扩容了。 原来的容量是 4，长度也是 4，当再来一个新元素的时候由于没有位置了，所以要扩容。但扩容的时候肯定会将容量申请的大一些、即底层数组申请的长一些，具体申请多长，Python 内部有一个公式，我们后面会说。总之申请的新的底层数组长度是 8，那么说明列表的容量就变成了 8。 新数组申请之后，将原来旧数组中的 PyObject * 按照顺序依次拷贝过去，再让 ob_item 指向新数组。然后把要添加的元素设置在新数组中索引为 ob_size 的位置、即第 5 个位置，并将 ob_size 加 1。最后将旧数组释放掉。 以上便是列表底层在扩容的时候所经历的过程。 由于扩容会申请新数组，然后将旧数组的元素拷贝到新数组中，所以这是一个时间复杂度为 O(n) 的操作。而 append 可能会导致列表扩容，因此 append 最坏情况下也是一个 O(n) 的操作，只不过扩容不会频繁发生，所以 append 方法的平均时间复杂度还是 O(1)。 另外我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了指向这个指针数组首元素的二级指针。显然我们添加、删除、修改元素等操作，都是通过 ob_item 二级指针来间接操作指针数组。 至于这么做的原因，我们在介绍 Python 对象的时候就说过了，不记得了的话，可以回去翻一翻。 所以底层对应的 PyListObject 实例的大小其实是不变的，因为指针数组没有存在 PyListObject 里面。但 Python 在计算内存大小的时候是会将这个指针数组也算进去的，所以列表的大小是可变的。 而且我们知道，列表在 append 之后地址是不变的，至于原因上面的几张图已经解释得很清楚了。 如果长度没有达到容量，那么 append 其实就是往底层数组中设置了一个新元素。如果达到容量了，那么会扩容，但扩容只是申请一个新的指针数组，然后让 ob_item 重新指向罢了。所以底层的指针数组会变，但是 PyListObject 结构体实例本身是没有变化的，因此列表在执行 append、extend、pop、insert 等操作时，地址不会发生变化。 下面再来看看列表所占的内存大小是怎么算的，首先 PyListObject 里面的 PyObject_VAR_HEAD 占 24 字节，ob_item 占 8 字节，allocated 占 8 字节，总共 40 字节。但是不要忘记，在计算列表大小的时候，ob_item 指向的指针数组也要算在内。所以：列表的大小 = 40 + 8 * 指针数组长度（或者说列表容量）。注意是指针数组长度，可不是列表长度，因为数组一旦申请了，不管你用没用，大小就摆在那里了。就好比你租了间房子，就算不住，房租该交还是得交。 # 显然一个空数组占 40 个字节\nprint([].__sizeof__()) # 40 # 40 + 3 * 8 = 64\nprint([1, 2, \"x\" * 1000].__sizeof__()) # 64\n# 虽然里面有一个长度为 1000 的字符串\n# 但我们说列表存放的都是指针，所以大小都是 8 字节 # 注意：我们通过 lst = [1, 2, 3] 这种方式创建列表的话\n# 不管内部元素有多少个, 其 ob_size 和 allocated 都是一样的\n# 只有当列表在添加元素的时候发现容量不够了才会扩容\nlst = list(range(10))\n# 40 + 10 * 8 = 120\nprint(lst.__sizeof__()) # 120 # 长度为 4，此时容量也是 4\nlst = [\"巭\", \"孬\", \"嫑\", \"睡觉\"]\n# 大小为 40 + 4 * 8 = 72\nprint(lst.__sizeof__()) # 72\n# 添加一个元素\nlst.append(\"觉得睡啊\")\n# 大小变成了 40 + 8 * 8 = 104\n# 说明当发生扩容时，底层数据可以容纳 8 个元素\nprint(lst.__sizeof__()) # 104 关于列表的长度和容量的关系，以及扩容的规则，我们后续再聊。总之目前我们知道列表的大小是怎么计算的，以及为什么列表在通过索引定位元素的时候，时间复杂度是 O(1)。因为列表存储的都是对象的指针，不管对象有多大，其指针大小是固定的，都是 8 字节，通过索引可以瞬间计算出偏移量。 print([1, 2, 3].__sizeof__()) # 64\nprint([[1, 2, 3]].__sizeof__()) # 48 相信上面这个结果，你肯定能分析出原因。因为第一个列表中有 3 个指针，所以大小是 40 + 24 = 64。而第二个列表中有一个指针，所以是 40 + 8 = 48。用一张图来展示一下 [1, 2, 3] 和 [[1, 2, 3]] 的底层结构，看看它们之间的区别： 到此相信你已经彻底掌握列表的结构了，那么下一篇文章我们来介绍一下列表的长度和容量之间的关系，以及扩容是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 列表的底层结构","id":"140","title":"列表的底层结构"},"141":{"body":"本篇文章来说一说列表的扩容，我们知道列表在添加元素时，如果发现底层的指针数组已经满了，那么会进行扩容，申请一个更大的数组。 下面就来看看底层是怎么实现的，相关操作都位于 Objects/listobject.c 中。 static int\nlist_resize(PyListObject *self, Py_ssize_t newsize)\n{ // 参数 self 就是列表，newsize 指的是元素在添加之后的 ob_size // 比如列表的 ob_size 和容量都是 4，append 的时候发现容量不够 // 所以会扩容，那么这里的 newsize 就是 5 // 如果是 extend 添加 3 个元素，那么这里的 newsize 就是 7 // 当然 list_resize 这个函数不仅可以扩容，也可以缩容 // 假设列表原来有 1000 个元素，这个时候将列表清空了，那么容量肯定缩小，不然会浪费内存 // 如果清空了列表，那么这里的 newsize 显然就是 0 // 二级指针，指向指针数组的首元素 PyObject **items; // 新的容量，以及新的指针数组的内存大小 size_t new_allocated, num_allocated_bytes; // 获取原来的容量 Py_ssize_t allocated = self->allocated; // 如果 newsize 达到了容量的一半，但还没有超过容量 // 那么意味着 newsize、或者新的 ob_size 和容量是匹配的 // 所以容量不会变化，直接将列表的 ob_size 设置为 newsize 即可 if (allocated >= newsize && newsize >= (allocated >> 1)) { assert(self->ob_item != NULL || newsize == 0); Py_SIZE(self) = newsize; return 0; } // 走到这里说明容量和 newsize 不匹配了，所以要进行扩容或者缩容 // 因此要申请新的底层数组，那么长度是多少呢？ // 这里给出了公式，一会儿我们可以通过 Python 进行测试 new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6); // 容量也是有范围的，乘上 8 字节不能超过 PY_SSIZE_T_MAX if (new_allocated > (size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)) { PyErr_NoMemory(); return -1; } // 如果 newsize 为 0，那么容量也为 0 if (newsize == 0) new_allocated = 0; // 分配内存 num_allocated_bytes = new_allocated * sizeof(PyObject *); items = (PyObject **)PyMem_Realloc(self->ob_item, num_allocated_bytes); if (items == NULL) { PyErr_NoMemory(); return -1; } // 将 ob_items 字段设置为 items self->ob_item = items; // 将 ob_size 字段设置为 newsize Py_SIZE(self) = newsize; // 将 allocated 字段设置为 new_allocated self->allocated = new_allocated; return 0;\n} 我们看到还是很简单的，没有什么黑科技。然后是列表扩容的时候，容量和元素个数之间的规律。其实在 list_resize 函数中是有注释的，其中有这么一行。 说明我们往一个空列表中不断 append 元素的时候，容量会按照上面的规律进行变化，我们来试一下。 lst = []\nallocated = 0\nprint(\"此时容量是: 0\") for item in range(100): lst.append(item) # 添加元素 # 计算 ob_size ob_size = len(lst) # 判断 ob_size 和当前的容量 if ob_size > allocated: # 列表的大小减去空列表的大小，再除以 8 显然就是容量 allocated = (lst.__sizeof__() - [].__sizeof__()) // 8 print(f\"列表扩容啦, 新的容量是: {allocated}\")\n\"\"\"\n此时容量是: 0\n列表扩容啦, 新的容量是: 4\n列表扩容啦, 新的容量是: 8\n列表扩容啦, 新的容量是: 16\n列表扩容啦, 新的容量是: 25\n列表扩容啦, 新的容量是: 35\n列表扩容啦, 新的容量是: 46\n列表扩容啦, 新的容量是: 58\n列表扩容啦, 新的容量是: 72\n列表扩容啦, 新的容量是: 88\n列表扩容啦, 新的容量是: 106\n\"\"\" 我们看到和官方给的结果是一样的，显然这是毫无疑问的，根据底层的公式也能算出来。 ob_size = 0\nallocated = 0 print(allocated, end=\" \")\nfor item in range(100): newsize = ob_size + 1 if newsize > allocated: allocated = (newsize + (newsize >> 3) + 6) & ~3 print(allocated, end=\" \") ob_size = newsize\n\"\"\"\n0 4 8 16 24 32 40 52 64 76 92 108 \"\"\" 注：扩容是在添加元素的时候发现容量不够发生的，也就是底层数组存储的实际元素的个数（列表长度）等于数组长度，没办法再容纳新的元素了，所以要扩容。 如果我们直接通过 lst = [] 这种形式创建列表的话，那么其长度和容量是一样的。 lst = [0] * 1000\n# 长度和容量一致\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 但再添加一个元素的话, 那么 ob_size 会变成 1001，大于容量 1000\n# 所以此时列表就要扩容了, 执行 list_resize，里面的 new_size 就是 1001\n# 然后是怎么分配容量来着，new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6)\nprint( \"新容量:\", 1001 + (1001 >> 3) + (3 if 1001 < 9 else 6)\n) # 新容量: 1132 # append 一个元素，列表扩容\nlst.append(123)\n# 计算容量\nprint((lst.__sizeof__() - [].__sizeof__()) // 8) # 1132 结果是一样的，因为底层就是这么实现的，所以结果必须一样。只不过我们通过这种测试的方式证明了这一点，也加深了对列表的认识。 需要注意的是，会影响列表元素个数的操作（append、extend、insert、pop 等等），在执行前都会先执行一下 list_resize 进行容量检测。如果计算之后的 newsize 和 allocated 之间的关系是匹配的，即 allocated//2 <= newsize <= allocated，那么只需要将 ob_size 的大小更新为 newsize 即可。如果不匹配，那么还要进行扩容，此时是一个 O(n) 的操作。 介绍完扩容，再来介绍缩容，因为列表元素个数要是减少到和容量不匹配的话，也要进行缩容。 举个生活中的例子，假设你租了 10 间屋子用于办公，显然你要付 10 间屋子的房租，不管你有没有用，一旦租了肯定是要付钱的。同理底层数组也是一样，只要你申请了，不管有没有元素，内存已经占用了。但有一天你用不到 10 间屋子了，假设要用 8 间或者 9 间，那么会让剩余的屋子闲下来。但由于退租比较麻烦，并且只闲下来一两间屋子，所以干脆就不退了，还是会付 10 间屋子的钱，这样没准哪天又要用的时候就不用重新租了。 对于列表也是如此，在删除元素（相当于屋子不用了）的时候，如果发现长度还没有低于容量的一半，那么也不会缩容。但反之就要缩容了，比如屋子闲了 8 间，也就是只需要两间屋子就足够了，那么此时肯定要退租了，闲了 8 间，可能会退掉 6 间。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 删除 500 个元素, 此时长度或者说 ob_size 就为 500\nlst[500:] = []\n# 但 ob_size 还是达到了容量的一半, 所以不会缩容\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 500 1000 # 如果再删除一个元素的话, 那么不好意思, 显然就要进行缩容了\n# 因为 ob_size 变成了 499, 小于 1000 // 2\n# 缩容之后容量怎么算呢? 还是之前那个公式\nprint(499 + (499 >> 3) + (3 if 499 < 9 else 6)) # 567 # 测试一下, 删除一个元素, 看看会不会按照我们期待的规则进行缩容\nlst.pop()\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 499 567 一切都和我们想的是一样的，另外在代码中我们还看到一个 if 语句，就是如果 newsize 是 0，那么容量也是 0，来测试一下。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 lst[:] = []\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 0 0 # 如果按照之前的容量变化公式的话, 会发现结果应该是 3\n# 但实际结果是 0, 就是因为多了 if 判断\n# 如果 newsize 是 0, 就把容量也设置为 0\nprint(0 + (0 >> 3) + (3 if 0 < 9 else 6)) # 3 为什么要这么做呢？因为 Python 认为，列表长度为 0 的话，说明你不想用这个列表了，所以多余的 3 个也没有必要申请了。 还以租房为栗，如果你一间屋子都不用了，说明你可能不用这里的屋子办公了，因此直接全部退掉。 以上就是列表在改变容量时所采用的策略，我们从头到尾全部分析了一遍。下一篇文章来看一下列表的创建，以及缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"34. 列表是怎么扩容的？","id":"141","title":"34. 列表是怎么扩容的？"},"142":{"body":"前面我们分析了列表的底层结构和扩容机制，本篇文章来聊一聊列表的创建和销毁，以及缓存池。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 楔子","id":"142","title":"楔子"},"143":{"body":"创建列表，解释器只提供了唯一的一个 Python/C API，也就是 PyList_New。这个函数接收一个 size 参数，允许我们在创建 PyListObject 对象时指定底层的 PyObject * 数组的长度。 //Objects/listobject.c\nPyObject *\nPyList_New(Py_ssize_t size)\n{ // 声明一个 PyListObject * 变量 // 指向即将创建的 PyListObject 对象 PyListObject *op; // 底层数组的长度必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // numfree 表示缓存池中已缓存的元素个数 // 如果大于 0，证明有可用元素，那么会从缓存池中获取 if (numfree) { // 可用元素的数量减一 numfree--; // 获取缓存的列表指针，并将指向的列表的引用计数设置为 1 op = free_list[numfree]; _Py_NewReference((PyObject *)op); } else { // 如果缓存池中没有可用元素，那么通过 PyObject_GC_New 申请内存 // 问题来了，之前申请内存不是用的 PyObject_New 吗 // 这里为啥换成 PyObject_GC_New 呢？我们稍后再说 op = PyObject_GC_New(PyListObject, &PyList_Type); if (op == NULL) return NULL; } // 如果 size <= 0，那么一定等于 0，此时列表不包含任何元素 if (size <= 0) // 那么 ob_item 直接设置为 NULL op->ob_item = NULL; else { // 否则为底层数组申请内存，因为存储的都是指针 // 所以大小为 size * sizeof(PyObject *) op->ob_item = (PyObject **) PyMem_Calloc(size, sizeof(PyObject *)); if (op->ob_item == NULL) { Py_DECREF(op); return PyErr_NoMemory(); } } // 将 ob_size 和 allocated 均设置为 size Py_SIZE(op) = size; op->allocated = size; // 让列表被 GC 跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 整个过程非常好理解，就是先创建一个 PyListObject 对象，然后再为底层数组申请内存，最后通过 ob_item 字段将两者关联起来。当然这个过程中会使用缓存池，关于缓存池一会儿再聊。 然后还要说一下内存申请函数，在这之前我们看到申请内存用的是 PyObject_New 函数，它和这里的 PyObject_GC_New 有什么区别呢？由于涉及到 Python 的内存管理，我们暂时先不聊那么深，大家先有个基本了解即可，等到介绍内存管理和垃圾回收的时候会详细剖析。 我们知道 Python 对象在底层都是一个结构体，并且结构体内部嵌套了 PyObject。但对于那些能够产生循环引用的可变对象来说，它们除了 PyObject 之外，还包含了一个 PyGC_Head，用于垃圾回收。 所以 PyObject_New 和 PyObject_GC_New 接收的参数是一样的，但后者会多申请 16 字节的内存，这 16 字节是为 PyGC_Head 准备的。那么问题来了，PyGC_Head 在什么地方呢？ PyGC_Head 就在 PyObject 的前面，但是注意：虽然为 PyGC_Head 申请了内存，但返回的是 PyObject 的地址。至于这里面的更多细节，后续在剖析内存管理和垃圾回收的时候细说，目前先简单了解一下即可。 然后再说一下计算内存的两种方式： import sys lst = []\n# 可以调用 __sizeof__ 方法计算对象的内存\nprint(lst.__sizeof__()) # 40\n# 也可以通过 sys.getsizeof 函数\nprint(sys.getsizeof(lst)) # 56 我们看到 sys.getsizeof 算出的结果会多出 16 字节，相信你能猜到原因，因为它将 PyGC_Head 也算进去了，而对象的 __sizeof__ 方法则不会算在内。 不过对于字符串、整数、浮点数这种不会产生循环引用的对象来说，由于没有 PyGC_Head，所以两种方式计算的结果是一样的。 import sys print(\"\".__sizeof__()) # 49\nprint(sys.getsizeof(\"\")) # 49 print((123).__sizeof__()) # 28\nprint(sys.getsizeof(123)) # 28 以上就是列表的创建，整个过程不难理解。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的创建","id":"143","title":"列表的创建"},"144":{"body":"创建 PyListObject 对象时，会先检测缓存池 free_list 里面是否有可用的对象，有的话直接拿来用，否则通过 malloc 在系统堆上申请。列表的缓存池是使用数组实现的，里面最多维护 80 个 PyListObject 对象。 // Objects/listobject.c\n#ifndef PyList_MAXFREELIST\n#define PyList_MAXFREELIST 80\n#endif\n// free_list 是一个 PyListObject * 数组，容量为 80\n// 添加元素时会从数组的尾部添加，获取元素时也会从数组的尾部获取\nstatic PyListObject *free_list[PyList_MAXFREELIST];\n// 缓存池中可用元素数量\nstatic int numfree = 0; 根据之前的经验我们知道，既然创建的时候能从缓存池中获取，那么在执行析构函数的时候也要把列表放到缓存池里面。看一下列表的析构函数，它由 PyList_Type 的 tp_dealloc 字段负责，而该字段被设置为 list_dealloc。 // Objects/listobject.c\nstatic void\nlist_dealloc(PyListObject *op)\n{ Py_ssize_t i; // 列表可能会产生循环引用，因此创建之后要被 GC 跟踪 // 而现在要被回收了，所以也要取消 GC 跟踪 PyObject_GC_UnTrack(op); // 这一步的作用，稍后再说 Py_TRASHCAN_BEGIN(op, list_dealloc) // 先释放底层数组 if (op->ob_item != NULL) { // 但是释放之前，还有一件重要的事情 // 要将底层数组中每个指针指向的对象的引用计数都减去 1 // 因为它们不再持有对\"对象\"的引用 i = Py_SIZE(op); while (--i >= 0) { Py_XDECREF(op->ob_item[i]); } // 然后释放底层数组所占的内存 PyMem_FREE(op->ob_item); } // 如果已缓存的元素个数小于 80 个，并且 op 指向的是列表 // 那么将 op 追加到数组中，并将 numfree 自增 1 if (numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) free_list[numfree++] = op; else // 否则将列表的内存释放掉 Py_TYPE(op)->tp_free((PyObject *)op); Py_TRASHCAN_END\n} 我们知道创建一个 PyListObject 对象会分为两步，先创建 PyListObject 对象，然后创建底层数组，最后让 PyListObject 对象的 ob_item 字段指向底层数组的首元素。同理，在销毁一个 PyListObject 对象时，会先释放 ob_item 维护的底层数组，然后在缓存池已满的情况下再释放 PyListObject 对象自身。 现在我们算是明白了缓存池的机制，本来在销毁列表时，要将它的内存释放。但因为缓存池机制，解释器并没有这么做，而是将它的指针放在了缓存池里，至于列表对象则依旧驻留在堆上，只是我们已经无法再访问了。 当以后创建新的 PyListObject 对象时，解释器会首先唤醒这些已经死去的 PyListObject 对象，给它们一个洗心革面、重新做人的机会。但需要注意的是，这里缓存的仅仅是 PyListObject 对象，至于底层数组，其 ob_item 已经不再指向了。 从 list_dealloc 中我们可以看到，PyListObject 对象的指针在放进缓存池之前，ob_item 指向的数组就已经被释放掉了，同时数组中指针指向的对象的引用计数会减 1。所以最终数组中这些指针指向的对象也大难临头各自飞了，或生存、或毁灭，总之此时和 PyListObject 之间已经没有任何联系了。 但是为什么要这么做呢？为什么不连底层数组也一起维护呢？可以想一下，如果继续维护的话，数组中指针指向的对象永远不会被释放，那么很可能会产生悬空指针的问题。 但实际上是可以将底层数组进行保留的，做法是只将数组中指针指向的对象的引用计数减 1，然后将数组中的指针都设置为 NULL，不再指向之前的对象，但并不释放底层数组本身所占用的内存空间。这样一来释放的内存不会交给系统堆，那么再次分配的时候，速度会快很多。但这样会带来两个问题。 1）这些内存没人用也会一直占着，并且只能供 PyListObject 对象的 ob_item 指向的底层数组使用。 2）基于缓存池获取的列表的容量，和新创建的列表的容量不一定匹配。比如底层数组长度为 6 的 PyListObject * 被放入了缓存池，那么表示列表最多容纳 6 个元素，但如果我们要创建一个长度为 8 的列表怎么办？此时依旧要重新为底层数组申请内存。 因此基于以上两个原因，Python 选择将底层数组所占的内存交还给了系统堆，当然也节省了内存。 lst1 = [1, 2, 3]\nprint(id(lst1)) # 139672412671360\n# 扔到缓存池中，放在数组的尾部\ndel lst1 # 从缓存池中获取，也会从数组的尾部开始拿\nlst2 = [1, 2, 3]\nprint(id(lst2)) # 139672412671360 # 因此打印的地址是一样的 以上就是列表的创建和销毁，以及它的缓存池原理。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的销毁","id":"144","title":"列表的销毁"},"145":{"body":"在看列表的销毁过程时，我们注意到里面有这么一行代码。 Py_TRASHCAN_BEGIN(op, list_dealloc) 这是做什么的呢，首先在 Python 中，我们可以创建具有深度递归的对象，比如： L = None for i in range(2 ** 20): L = [L] del L 此时的 L 就是一个嵌套了 2 ** 20 层的列表，当我们删除 L 的时候，会先销毁 L[0]、然后销毁 L[0][0]，以此类推，直到递归深度为 2 ** 20。而这样的深度毫无疑问会溢出 C 的调用栈，导致解释器崩溃。但事实上我们在 del L 的时候解释器并没有崩溃，原因就是 CPython 发明了一种名为 trashcan 的机制，它通过延迟销毁的方式来限制销毁的递归深度。关于这一特性，我们知道就好了，不用太关注。 下一篇文章来聊一聊列表的操作在底层是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » trashcan 机制","id":"145","title":"trashcan 机制"},"146":{"body":"列表拥有非常多的方法，比如添加元素、查询元素等，这些都属于列表的自定义方法。当然不光是列表，任何对象都可以有自己的自定义方法，而这些方法会保存在类型对象的 tp_methods 里面。 当然列表除了拥有自定义的方法之外，还拥有作为序列型对象所共有的方法，比如合并、基于索引和切片获取元素、基于索引和切片设置元素等等。这些方法会基于种类被抽象成三个方法簇，分别是： tp_as_number：数值型对象拥有的方法； tp_as_sequence：序列型对象拥有的方法； tp_as_mapping：映射型对象拥有的方法； 每个方法簇都包含了大量的 C 函数，每个 C 函数一般会对应 Python 里的一个魔法方法和操作符。比如 tp_as_sequence 的 sq_concat 对应序列型对象的 __add__ 方法，tp_as_number 的 nb_subtract 对应数值型对象的 __sub__ 方法。 那么接下来我们就详细剖析一下这些方法的具体实现过程。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 楔子","id":"146","title":"楔子"},"147":{"body":"序列型对象都实现了加法运算，比如列表，两个列表相加可以合并为一个新的列表。 print([1, 2, 3] + [4, 5]) \"\"\"\n[1, 2, 3, 4, 5]\n\"\"\" 虽然使用了 + 操作符，但它在底层是由 tp_as_sequence 的 sq_concat 负责实现的，该字段被赋值为 list_concat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_concat(PyListObject *a, PyObject *bb)\n{ // 两个列表相加之后的新列表的长度 Py_ssize_t size; Py_ssize_t i; PyObject **src, **dest; PyListObject *np; // 如果 bb 不是列表，抛出 TypeError if (!PyList_Check(bb)) { PyErr_Format(PyExc_TypeError, \"can only concatenate list (not \\\"%.200s\\\") to list\", bb->ob_type->tp_name); return NULL; }\n#define b ((PyListObject *)bb) // 两个列表的长度相加一定小于 PY_SSIZE_T_MAX if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) return PyErr_NoMemory(); // 新列表的长度，等于相加的两个列表的长度之和 size = Py_SIZE(a) + Py_SIZE(b); // 为 PyListObject 和底层数组申请空间（空间大小为 8 * size） np = (PyListObject *) list_new_prealloc(size); if (np == NULL) { return NULL; } // 将第一个列表的元素增加引用计数之后，拷贝到新列表中 src = a->ob_item; dest = np->ob_item; for (i = 0; i < Py_SIZE(a); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将第二个列表的元素增加引用计数之后，拷贝到新列表中 src = b->ob_item; dest = np->ob_item + Py_SIZE(a); for (i = 0; i < Py_SIZE(b); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; // 转成泛型指针之后返回 return (PyObject *)np;\n#undef b\n} 逻辑非常简单，假设两个列表 a 和 b 相加，过程如下。 先申请一个新列表，长度为 len(a) + len(b)； 将列表 a 的元素拷贝到新列表中； 将列表 b 的元素拷贝到新列表中； 说白了就是两个 for 循环。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的相加","id":"147","title":"列表的相加"},"148":{"body":"列表可以乘上一个整数，将自身重复指定次数，该过程会返回一个新列表。 print([1, 2, 3] * 3)\n\"\"\"\n[1, 2, 3, 1, 2, 3, 1, 2, 3]\n\"\"\" 虽然使用了 * 操作符，但它在底层是由 tp_as_sequence 的 sq_repeat 负责实现的，该字段被赋值为 list_repeat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_repeat(PyListObject *a, Py_ssize_t n)\n{ Py_ssize_t i, j; Py_ssize_t size; PyListObject *np; PyObject **p, **items; PyObject *elem; // 如果 n 小于 0，那么将 n 设置为 0 if (n < 0) n = 0; // 长度有限制，不能超过 PY_SSIZE_T_MAX if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) return PyErr_NoMemory(); // 新列表的长度 size = Py_SIZE(a) * n; // 如果列表长度为 0，那么直接返回空列表即可 if (size == 0) return PyList_New(0); // 为新列表和底层数组申请空间，底层数组的长度为 size np = (PyListObject *) list_new_prealloc(size); if (np == NULL) return NULL; // 如果原始列表的长度为 1，比如 a = [1]，n = 3 // 那么新列表就是 [1, 1, 1] if (Py_SIZE(a) == 1) { // 指向新列表的底层数组的首元素 items = np->ob_item; // 拿到原始列表的第一个元素 elem = a->ob_item[0]; // 将新列表的底层数组的元素全部设置为 elem for (i = 0; i < n; i++) { items[i] = elem; Py_INCREF(elem); } } // 如果原始列表的长度不为 1 else { // 指向新列表的底层数组的首元素 p = np->ob_item; // 指向原始列表的底层数组的首元素 items = a->ob_item; // 两层 for 循环 // 内层循环遍历原始数组，将元素拷贝到新数组，外层循环则是循环 n 次 for (i = 0; i < n; i++) { for (j = 0; j < Py_SIZE(a); j++) { *p = items[j]; Py_INCREF(*p); p++; } } } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; return (PyObject *) np;\n} 整个过程非常朴实无华。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的重复","id":"148","title":"列表的重复"},"149":{"body":"列表可以基于索引和切片截取元素。 data = [1, 2, 3, 4, 5]\nprint(data[1]) # 2\nprint(data[1: 4]) # [2, 3, 4] 在底层它由 tp_as_mapping 的 mp_subscript 实现，该字段被赋值为 list_subscript 函数，看一下它的内部逻辑。 // Objects/listobject.c static PyObject *\nlist_subscript(PyListObject* self, PyObject* item)\n{ // 在基于索引和切片截取时，所有序列型对象的逻辑都差不多 if (PyIndex_Check(item)) { Py_ssize_t i; // 如果 item 是索引，那么转成 Py_ssize_t 整数 i = PyNumber_AsSsize_t(item, PyExc_IndexError); if (i == -1 && PyErr_Occurred()) return NULL; // 如果 i 小于 0，那么加上列表长度，转成正数索引 if (i < 0) i += PyList_GET_SIZE(self); // 调用 list_item 获取 ob_item 中索引为 i 的元素 return list_item(self, i); } // 如果 item 是切片 else if (PySlice_Check(item)) { // start, stop, step 分别表示起始位置、终止位置、步长 // slicelength 表示切片截取的长度，也就是要截取多少个元素 Py_ssize_t start, stop, step, slicelength, cur, i; PyObject* result; PyObject* it; PyObject **src, **dest; // 获取切片的 start、stop、step if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 传入原始列表的长度，对 start 和 stop 进行调整，并返回 slicelength slicelength = PySlice_AdjustIndices(Py_SIZE(self), &start, &stop, step); // 如果 slicelength <= 0，说明截取不到任何元素 // 比如 data[5: 1] 或者 data[1: 5: -1]，那么直接返回空列表 if (slicelength <= 0) { return PyList_New(0); } // 如果步长为 1，那么直接将列表中 start 到 stop 之间的元素拷过去即可 else if (step == 1) { return list_slice(self, start, stop); } // 否则说明步长不为 1 else { // 为创建的新列表和底层数组申请空间 result = list_new_prealloc(slicelength); if (!result) return NULL; src = self->ob_item; // 从 start 处开始遍历，将元素拷贝过去 // 然后 cur 每次增加 step，遍历次数为 slicelength dest = ((PyListObject *)result)->ob_item; for (cur = start, i = 0; i < slicelength; cur += (size_t)step, i++) { it = src[cur]; Py_INCREF(it); dest[i] = it; } // 将新列表的 ob_size 设置为 slicelength Py_SIZE(result) = slicelength; return result; } } // 否则说明 item 既不是索引也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"list indices must be integers or slices, not %.200s\", item->ob_type->tp_name); return NULL; }\n} 这个和之前介绍的 bytes 对象有点像，因为它们都是序列型对象，在基于索引和切片截取元素时的逻辑也是类似的。但 bytes 对象只能截取元素，却不能设置元素，而列表是可以的，因为列表是可变对象。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片获取元素","id":"149","title":"基于索引和切片获取元素"},"15":{"body":"PyObject 是所有对象的核心，它包含了所有对象都共有的信息，但是还有那么一个属性虽然不是每个对象都有，但至少有一大半的对象会有，能猜到是什么吗？ 之前说过，对象根据所占的内存是否固定，可以分为定长对象和变长对象，而变长对象显然有一个长度的概念，比如字符串、列表、元组等等。即便是相同类型的实例对象，但是长度不同，所占的内存也是不同的。比如字符串内部有多少个字符，元组、列表内部有多少个元素，显然这里的多少也是 Python 中很多对象的共有特征。虽然不像引用计数和类型那样是每个对象都必有的，但也是绝大部分对象所具有的。 所以针对变长对象，Python 底层也提供了一个结构体，因为 Python 里面很多都是变长对象。 // Include/object.h typedef struct { PyObject ob_base; Py_ssize_t ob_size;\n} PyVarObject; 我们看到 PyVarObject 实际上是 PyObject 的一个扩展，它在 PyObject 的基础上添加了一个 ob_size 字段，用于记录内部的元素个数。比如列表，列表的 ob_size 维护的就是列表的元素个数，插入一个元素，ob_size 会加 1，删除一个元素，ob_size 会减 1。 因此使用 len 函数获取列表的元素个数是一个时间复杂度为 O(1) 的操作，因为 ob_size 始终和内部的元素个数保持一致，所以会直接返回 ob_size。 所有的变长对象都拥有 PyVarObject，而所有的对象都拥有 PyObject，这就使得在 Python 中，对对象的引用变得非常统一。我们只需要一个 PyObject * 就可以引用任意一个对象，而不需要管这个对象实际是一个什么样的对象。 所以 Python 变量、以及容器内部的元素，本质上都是一个 PyObject *。而在操作变量的时候，也要先根据 ob_type 字段判断指向的对象的类型，然后再寻找该对象具有的方法，这也是 Python 效率慢的原因之一。 由于 PyObject 和 PyVarObject 要经常使用，所以底层提供了两个宏，方便定义。 // Include/object.h #define PyObject_HEAD PyObject ob_base;\n#define PyObject_VAR_HEAD PyVarObject ob_base; 比如定长对象浮点数，在底层对应的结构体为 PyFloatObject，它只需在 PyObject 的基础上再加一个 double 即可。 typedef struct { // 等价于 PyObject ob_base; PyObject_HEAD double ob_fval;\n} PyFloatObject; 再比如变长对象列表，在底层对应的结构体是 PyListObject，所以它需要在 PyVarObject 的基础上再加一个指向指针数组首元素的二级指针和一个容量。 typedef struct { // 等价于 PyVarObject ob_base; PyObject_VAR_HEAD PyObject **ob_item; Py_ssize_t allocated;\n} PyListObject; 这上面的每一个字段都代表什么，我们之前提到过，当然这些内置的数据结构后续还会单独剖析。 对于 PyListObject，里面的 ob_item 就是指向指针数组首元素的二级指针，而 allocated 表示已经分配的容量，一旦添加元素的时候发现 ob_size 自增 1 之后会大于 allocated，那么解释器就知道数组已经满了（容量不够了）。于是会申请一个长度更大的指针数组，然后将旧数组内部的元素按照顺序逐个拷贝到新数组里面，并让 ob_item 指向新数组的首元素，这个过程就是列表的扩容，后续在剖析列表的时候还会细说。 所以我们看到列表在添加元素的时候，地址是不会改变的，即使容量不够了也没关系，直接让 ob_item 指向新的数组就好了，至于 PyListObject 对象（列表）本身的地址是不会变化的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 可变对象的地基：PyVarObject","id":"15","title":"可变对象的地基：PyVarObject"},"150":{"body":"列表是可变对象，因为它支持设置元素，即对内部元素进行修改。基于索引设置元素就不说了，我们主要看切片，它背后还是有一些复杂的。 data = [1, 2, 3, 4, 5, 6, 7, 8] # 通过切片设置元素，右值一定是一个可迭代对象\ndata[0: 3] = [11, 22, 33]\n# 会将 data[0] 设置为 11，将 data[1] 设置为 22，将 data[2] 设置为 33\nprint(data)\n\"\"\"\n[11, 22, 33, 4, 5, 6, 7, 8]\n\"\"\" # 而且它们的长度是可以不相等的，这里表示将 [0: 3] 的元素设置为 [1, 2]\n# 即 data[0] 设置成 1，data[1] 设置成 2，那么问题来了，data[2] 咋办？\n# 由于右值中已经没有元素与之匹配了，那么 data[2] 就会被删掉\ndata[0: 3] = [1, 2]\nprint(data)\n\"\"\"\n[1, 2, 4, 5, 6, 7, 8]\n\"\"\" # 所以如果想删除 [0: 3] 的元素，那么只需要执行 data[0: 3] = [] 即可\n# 因为 [] 里面没有元素能与之匹配，所以 data 中 [0: 3] 的位置由于匹配不到\n# 那么相当于执行了删除操作，当然由于 Python 的动态特性，还可以像下面这么做\n# data[0: 3] = []、data[0: 3] = ()、data[0: 3] = \"\" 等等也是没问题的\ndata[0: 3] = \"\"\nprint(data)\n\"\"\"\n[5, 6, 7, 8]\n\"\"\"\n# 实际上执行 del data[0] 的时候，就是执行了 data[0: 1] = []\n# 当然，如果右值元素多的话也是可以的，相当于插入\n# 比如这里的 data[0] 匹配 1，然后左边就结束了\n# 于是右侧剩余的元素会依次插在后面\ndata[0: 1] = [1, 2, 3, 4]\nprint(data)\n\"\"\"\n[1, 2, 3, 4, 6, 7, 8]\n\"\"\"\n# 重点来了，如果切片的步长不等于 1 的话，那么两边一定要匹配\n# 由于 data[:: 2] 会得到 4 个元素，那么右边的可迭代对象的长度就必须也是 4\ndata[:: 2] = ['a', 'b', 'c', 'd']\nprint(data)\n\"\"\"\n['a', 2, 'b', 4, 'c', 7, 'd']\n\"\"\" # 但如果长度不一致，那么会报错\ntry: data[:: 2] = ['a', 'b', 'c']\nexcept Exception as e: # 显然会报错 print(e) \"\"\"\nattempt to assign sequence of size 3 to extended slice of size 4\n\"\"\" 至于它的源码有兴趣可以自己看一下，在底层它由 tp_as_mapping 的 mp_ass_subscript 负责实现，该字段被赋值为 list_ass_subscript 函数。逻辑比较长，但不难理解，我们总结一下。 list_subscript 用于获取元素，list_ass_subscript 用于设置元素。调用这两个函数，我们即可以传入索引，也可以传入切片。 获取元素时传入的是索引，那么 list_subscript 内部会调用 list_item，传入的是切片，那么会调用 list_slice。 设置元素时传入的是索引，那么 list_ass_subscript 内部会调用 list_ass_item，传入的是切片，那么会调用 list_ass_slice。并且 list_ass_slice 虽然是设置元素，但删除元素也是调用的它，比如通过 data[n: n+1]=[] 便可删除索引为 n 的元素。事实上 remove 和 pop 方法都只是计算出待删除元素的索引，真正的删除操作还是通过 list_ass_slice 来执行的。 另外，当传入切片时，只有步长为 1，才会调用 list_slice 和 list_ass_slice。如果步长不为 1，那么就采用循环的方式逐个遍历。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片设置元素","id":"150","title":"基于索引和切片设置元素"},"151":{"body":"以上我们就介绍了列表作为序列型对象拥有的方法，但除了这些它还有很多自定义的方法。由于列表用得非常广泛，关于它的方法我们都来详细地说上一说，下一篇文章介绍列表的自定义方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 小结","id":"151","title":"小结"},"152":{"body":"上一篇文章我们介绍了列表作为序列型对象支持的方法，但列表还有很多的自定义方法。作为一名优秀的 Python 工程师，我们必须要知道这些方法的实现过程，以及相应的时间复杂度。 实例对象能够调用的方法都定义在类型对象中，类型对象无一例外都是 PyTypeObject 结构体实例，该结构体有一个 tp_methods 字段，负责维护实例对象能够调用的方法。由于 tp_methods 指向 PyMethodDef 结构体类型的数组，所以一个 PyMethodDef 结构体实例，就是 Python 实例对象能够调用的一个方法。 // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 承载了具体逻辑的 C 函数 PyCFunction ml_meth; // 指示函数的调用方式和传递参数的方式，比如 /* METH_NOARGS: 表示函数不接收任何参数 * METH_O: 函数只接收一个参数 * METH_VARARGS: 函数支持以元组的形式接收多个位置参数 * METH_KEYWORDS: 函数支持关键字参数 * METH_CLASS: 函数是一个类方法，等价于 Python 里的 @classmethod * METH_STATIC: 函数是一个静态方法，即 @staticmethod * METH_FASTCALL: 函数使用优化的快速调用协议，Python 3.7 及以上版本可用 传递参数时使用 C 数组，而不是 Python 元组 * METH_COEXIST: 如果希望存在两个同名函数，但类和实例分别调用不同的函数 那么便可以指定 METH_COEXIST */ int ml_flags; // 函数的 docstring const char *ml_doc; }; 而 list 在底层对应 PyList_Type，它的 tp_methods 字段被赋值为 list_methods。 里面定义了列表可以调用的方法，相信当你以后想查看某个对象的方法的底层实现时，已经知道该怎么定位了，下面我们就来看看这些方法的实现过程。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 楔子","id":"152","title":"楔子"},"153":{"body":"append 方法可以往列表尾部追加元素。 // Objects/clinic/listobject.c.h\n#define LIST_APPEND_METHODDEF \\ {\"append\", (PyCFunction)list_append, METH_O, list_append__doc__}, 它由 list_append 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_append(PyListObject *self, PyObject *object)\n{ // 调用 app1 添加元素，并返回 None if (app1(self, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\napp1(PyListObject *self, PyObject *v)\n{ // 获取当前列表的长度 Py_ssize_t n = PyList_GET_SIZE(self); assert (v != NULL); if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 追加元素之后 ob_size 会变成 n + 1 // 调用 list_resize 函数，判断 n + 1 和容量之间的关系 // 只要涉及到列表元素个数的改变，都要调用 list_resize 函数 if (list_resize(self, n+1) < 0) return -1; // 增加引用计数 Py_INCREF(v); // 将元素设置在索引为 n 的位置 PyList_SET_ITEM(self, n, v); return 0;\n} 所谓往尾部追加元素，本质上就是将元素设置在索引为 len 的位置。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » append：在尾部追加元素","id":"153","title":"append：在尾部追加元素"},"154":{"body":"接下来是列表的 insert 方法。 // Objects/clinic/listobject.c.h\n#define LIST_INSERT_METHODDEF \\ {\"insert\", (PyCFunction)(void(*)(void))list_insert, METH_FASTCALL, list_insert__doc__}, 它由 list_insert 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_insert(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 函数的返回值，但只会返回 None PyObject *return_value = NULL; // 插入的位置 Py_ssize_t index; // 插入的元素 PyObject *object; // insert 方法精确接收两个参数 if (!_PyArg_CheckPositional(\"insert\", nargs, 2, 2)) { goto exit; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 参数 args 是一个元组，里面包含了插入位置和元素 Py_ssize_t ival = -1; // 插入位置，对象必须实现 __index__ PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { // 转成 Py_ssize_t ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } // 赋值给 index index = ival; } // 拿到待插入的元素 object = args[1]; // 调用 list_insert_impl 执行元素插入逻辑 return_value = list_insert_impl(self, index, object); exit: // 虽然这里返回了 return_value，但我们知道 insert 方法是没有返回值的 // 或者说返回值为 None，所以上面的 list_insert_impl 一定返回了 None return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_insert_impl(PyListObject *self, Py_ssize_t index, PyObject *object)\n{ // 调用 ins1 插入元素，插入成功之后返回 None if (ins1(self, index, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\nins1(PyListObject *self, Py_ssize_t where, PyObject *v)\n{ // 初始化循环变量 i，n 为列表长度 Py_ssize_t i, n = Py_SIZE(self); // 指向 ob_item 数组的首元素 PyObject **items; if (v == NULL) { PyErr_BadInternalCall(); return -1; } if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 只要涉及到元素个数的改变，比如添加和删除元素 // 都会先调用 list_resize，在里面检测一下容量 // 比如这里，如果发现 (容量 >= n + 1) && (容量 / 2 <= n + 1) // 那么说明容量目前是合理的，不需要做任何的扩容或缩容操作（如果条件不满足则需要） // 然后将列表的 ob_size 修改为 n + 1，直接返回 if (list_resize(self, n+1) < 0) return -1; // 判断插入位置，如果 where 小于 0，那么加上列表长度 if (where < 0) { where += n; // 加上列表长度之后如果还小于 0，那么让其等于 0 if (where < 0) where = 0; } // 如果插入位置大于列表长度 n，那么让其等于 n，此时相当于 append if (where > n) where = n; items = self->ob_item; // 将 where 以及之后的元素依次向右移动一个位置 for (i = n; --i >= where; ) items[i+1] = items[i]; // 将待插入元素 v 的引用计数加 1，并设置在底层数组中索引为 where 的位置 Py_INCREF(v); items[where] = v; return 0;\n} 以上就是 insert 函数的底层逻辑，列表在插入数据的时候是非常灵活的，不管你在什么位置插入，都是合法的。它会自己调整，在确定待插入位置 where 之后，会将 where 以及之后的所有元素都向后挪动一个位置，空出来的地方设置为待插入的值。 另外我们看到 append 和 insert 其实非常像，都是基于索引设置元素。只不过对于 append 来说，索引就是列表长度，而对于 insert 来说，索引是由外界指定的，但函数内部会进行边界调整。 并且由于 insert 会涉及元素的移动，所以它的时间复杂度是 O(n)，而 append 则不会，它的时间复杂度是 O(1)。当然在极端情况下（发生扩容），append 也会退化成 O(n)，只不过这个过程不会频繁发生，所以 append 的复杂度仍然是 O(1) 的。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » insert：在任意位置插入元素","id":"154","title":"insert：在任意位置插入元素"},"155":{"body":"pop 默认会从尾部弹出一个元素，当然我们也可以指定索引，弹出指定索引对应的元素。如果不指定索引，那么默认是 -1。 // Objects/clinic/listobject.c.h\n#define LIST_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))list_pop, METH_FASTCALL, list_pop__doc__}, 它由 list_pop 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_pop(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 返回值 PyObject *return_value = NULL; Py_ssize_t index = -1; // pop 接收 0 ~ 1 个参数 if (!_PyArg_CheckPositional(\"pop\", nargs, 0, 1)) { goto exit; } // 如果参数个数小于 1，说白了就是没有传参，直接跳转到 skip_optional 标签 if (nargs < 1) { goto skip_optional; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 如果传参了，那么拿到指定的索引 Py_ssize_t ival = -1; PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } index = ival; }\nskip_optional: // 将列表和 index 作为参数传进去，如果不指定索引，那么 index 默认为 -1 return_value = list_pop_impl(self, index); exit: // 返回弹出的元素 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_pop_impl(PyListObject *self, Py_ssize_t index)\n{ PyObject *v; int status; // 如果列表为空，那么抛出 IndexError: pop from empty list if (Py_SIZE(self) == 0) { PyErr_SetString(PyExc_IndexError, \"pop from empty list\"); return NULL; } // 如果 index 小于 0，那么加上列表长度 if (index < 0) index += Py_SIZE(self); // 检测索引是否合法，如果索引小于 0 或大于等于列表长度 // 那么抛出 IndexError: pop index out of range if (!valid_index(index, Py_SIZE(self))) { PyErr_SetString(PyExc_IndexError, \"pop index out of range\"); return NULL; } // 拿到索引为 index 的元素，这也是一会儿要返回的元素 v = self->ob_item[index]; // 快分支，如果 index == Py_SIZE(self) - 1，证明弹出的是列表的最后一个元素 // 那么说明不涉及元素的移动，直接更新 ob_size 即可 if (index == Py_SIZE(self) - 1) { status = list_resize(self, Py_SIZE(self) - 1); if (status >= 0) return v; else return NULL; } Py_INCREF(v); // 删除的不是最后一个元素，那么需要调用 list_ass_slice 进行删除 // 等价于 self[index: index + 1] = []，即删除索引为 index 的元素 status = list_ass_slice(self, index, index+1, (PyObject *)NULL); if (status < 0) { Py_DECREF(v); return NULL; } return v;\n} 以上就是 pop 方法。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » pop：从尾部弹出一个元素","id":"155","title":"pop：从尾部弹出一个元素"},"156":{"body":"index 方法可以接收一个元素，然后返回该元素首次出现的位置。当然还可以额外指定一个 start 和 end，表示查询的范围。 // Objects/clinic/listobject.c.h\n#define LIST_INDEX_METHODDEF \\ {\"index\", (PyCFunction)(void(*)(void))list_index, METH_FASTCALL, list_index__doc__}, 它由 list_index 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_index(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; PyObject *value; Py_ssize_t start = 0; Py_ssize_t stop = PY_SSIZE_T_MAX; // index 方法接收 1 ~ 3 个参数 if (!_PyArg_CheckPositional(\"index\", nargs, 1, 3)) { goto exit; } // args[0] 表示查找的元素 value = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示查找的起始位置 if (!_PyEval_SliceIndexNotNone(args[1], &start)) { goto exit; } if (nargs < 3) { goto skip_optional; } // args[2] 表示查找的结束位置 if (!_PyEval_SliceIndexNotNone(args[2], &stop)) { goto exit; }\nskip_optional: // 调用 list_index_impl 查找元素 return_value = list_index_impl(self, value, start, stop); exit: // 返回 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_index_impl(PyListObject *self, PyObject *value, Py_ssize_t start, Py_ssize_t stop)\n{ Py_ssize_t i; // 如果 start 小于 0，那么加上列表长度 if (start < 0) { start += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (start < 0) start = 0; } // 如果结束位置小于 0，那么加上列表长度，所以它们都支持负数索引 if (stop < 0) { stop += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (stop < 0) stop = 0; } // 从 start 开始遍历 for (i = start; i < stop && i < Py_SIZE(self); i++) { // 获取对应元素 PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 然后进行比较，这个函数我们之前说过 // 它会先比较地址是否相同，如果地址相同，那么直接判定为相等 // 如果地址不同，那么比较值是否相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 相等返回 1，不相等返回 0，比较失败返回 -1 // 如果 cmp 大于 0，表示两者相等，返回索引 if (cmp > 0) return PyLong_FromSsize_t(i); else if (cmp < 0) return NULL; } // 到这里说明元素不存在，那么抛出 ValueError: x is not in list PyErr_Format(PyExc_ValueError, \"%R is not in list\", value); return NULL;\n} 所以列表 index 方法的时间复杂度为 O(n)，因为它在底层要循环整个列表，如果运气好，可能第一个元素就是；运气不好，就只能循环整个列表了。 然后需要注意的是，在比较的时候，会先判断地址是否相同，然后再比较值是否相等。 class A: def __eq__(self, other): return False a = A()\ndata = [a] print(a == data[0]) # False\nprint(data.index(a)) # 0 a 和 data[0] 指向的对象不相等，但 data.index(a) 却返回了相应的索引，因为两者保存的地址是相同的。 同理 if v in data 这种也是类似的，先比较地址，地址不同再比较维护的值。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » index：查询元素首次出现的位置","id":"156","title":"index：查询元素首次出现的位置"},"157":{"body":"列表有一个 count 方法，可以计算出某个元素出现的次数。 // Objects/clinic/listobject.c.h\n#define LIST_COUNT_METHODDEF \\ {\"count\", (PyCFunction)list_count, METH_O, list_count__doc__}, 它由 list_count 函数负责实现。 // Objects/listobject.c\nstatic PyObject *\nlist_count(PyListObject *self, PyObject *value)\n{ Py_ssize_t count = 0; Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { // 如果地址相同，直接判定为相等，count 自增 1 PyObject *obj = self->ob_item[i]; if (obj == value) { count++; continue; } Py_INCREF(obj); // 地址不同（a is b 不成立），则比较维护的值是否相等（看 a == b 是否成立） int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); if (cmp > 0) count++; else if (cmp < 0) return NULL; } // 返回元素出现的次数 return PyLong_FromSsize_t(count);\n} 毫无疑问，count 方法无论在什么情况下，它都是一个时间复杂度为 O(n) 的操作，因为列表必须要从头遍历到尾。 但还是要注意里面判断相等的方式，因为变量只是一个指针，所以 C 的 == 相当于 Python 的 is，但 Python 的 == 则对应 PyObject_RichCompare 函数。而源码里面在比较的时候先执行 ==，所以会先判断两者是不是指向同一个对象。 class A: def __eq__(self, other): return False a = A()\ndata = [a, a, a]\nprint(data[0] == a) # False\nprint(data[1] == a) # False\nprint(data[2] == a) # False print(data.count(a)) # 3 我们看到列表里的三个元素和 a 都不相等，但计算数量的时候，结果是 3。原因就是比较的时候是先比较地址，如果地址一样，那么认为元素相同。 当然 PyObject_RichCompareBool 函数里面已经包含了比较地址的逻辑，该函数会先比较地址是否一样，如果一样则认为相等，不一样再比较对象维护的值是否相等。但在 count 方法里面，将比较地址的逻辑又单独拿了出来，可以理解为快分支。当然即遍没有也无所谓，因为在函数 PyObject_RichCompareBool 里面还是会先对地址进行比较。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » count：查询元素出现的次数","id":"157","title":"count：查询元素出现的次数"},"158":{"body":"除了根据索引删除元素之外，也可以根据值来删除元素，会删除第一个出现的元素。 // Objects/clinic/listobject.c.h\n#define LIST_REMOVE_METHODDEF \\ {\"remove\", (PyCFunction)list_remove, METH_O, list_remove__doc__}, 它由 list_remove 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_remove(PyListObject *self, PyObject *value)\n{ Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 比较是否相等，如果地址相同，那么认为相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 如果相等，那么进行删除 if (cmp > 0) { // 可以看到在删除元素的时候，调用了 list_ass_slice // 等价于 self[i: i + 1] = [] if (list_ass_slice(self, i, i+1, (PyObject *)NULL) == 0) Py_RETURN_NONE; return NULL; } else if (cmp < 0) return NULL; } // 否则说明元素不在列表中，抛出 ValueError: list.remove(x): x not in list PyErr_SetString(PyExc_ValueError, \"list.remove(x): x not in list\"); return NULL;\n} 以上就是 remove 函数的底层实现，说白了就是一层 for 循环，依次比较列表的每个元素和待删除元素是否相等。如果出现了相等的元素，则删除，然后直接返回，因为只删除一个；但如果整个循环遍历结束也没有发现满足条件的元素，那么报错，待删除元素不存在。 所以背后的逻辑并没有我们想象中的那么神秘。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » remove：删除指定元素","id":"158","title":"remove：删除指定元素"},"159":{"body":"如果是你的话，你会怎么对列表进行翻转呢？显然是采用双指针，头指针指向列表的第一个元素，尾指针指向列表的最后一个元素，然后两两交换。交换完毕之后，头指针后移一位、尾指针前移一位，继续交换。当两个指针相遇时，停止交换，而 Python 底层也是这么做的。 // Objects/clinic/listobject.c.h\n#define LIST_REVERSE_METHODDEF \\ {\"reverse\", (PyCFunction)list_reverse, METH_NOARGS, list_reverse__doc__}, 它由 list_reverse 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_reverse(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_reverse_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_reverse_impl(PyListObject *self)\n{ // 如果列表长度不大于 1，那么什么也不做，直接返回 None 即可 if (Py_SIZE(self) > 1) // 大于 1 的话，执行 reverse_slice，传递了两个参数 // 第一个参数是底层数组首元素的地址 // 而第二个参数则是底层数组中索引为 ob_size 的元素的地址 // 但很明显能访问的最大索引应该是 ob_size - 1 才对啊 // 别急，我们继续往下看，看一下 reverse_slice 函数的实现 reverse_slice(self->ob_item, self->ob_item + Py_SIZE(self)); Py_RETURN_NONE;\n} static void\nreverse_slice(PyObject **lo, PyObject **hi)\n{ assert(lo && hi); // 我们看到又执行了一次 --hi // 让二级指针 hi 指向了索引为 ob_size - 1 的元素 --hi; // 数组元素的地址，从左往右是依次增大的 // 如果 lo < hi，证明 lo 依旧在 hi 的左边，那么交换指向的元素 // 如果 lo > hi，证明两者相遇了，交换结束 while (lo < hi) { // 交换指向的元素，下面三步等价于 *lo, *hi = *hi, *lo // 但 C 不支持这么写，它需要借助一个中间变量 PyObject *t = *lo; *lo = *hi; *hi = t; // 两个指针继续靠近，指向的元素继续交换，直到两个指针相遇 ++lo; --hi; }\n} 所以到现在，你还认为 Python 的列表神秘吗？虽然我们很难自己写出一个 Python 解释器，但是底层的一些思想其实并没有那么难，作为一名程序猿很容易想的到。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » reverse：翻转列表","id":"159","title":"reverse：翻转列表"},"16":{"body":"PyObject 是 Python 对象的核心，因为 Python 对象在 C 的层面就是一个结构体，并且所有的结构体都嵌套了 PyObject 结构体。而 PyObject 内部有引用计数和类型这两个字段，因此我们可以肯定的说 Python 的任何一个对象都有引用计数和类型这两个属性。 另外大部分对象都有长度的概念，所以又引入了 PyVarObject，它在 PyObject 的基础上添加了一个 ob_size 字段，用于描述对象的长度。比如字符串内部的 ob_size 维护的是字符串的字符个数，元组、列表、集合等等，其内部的 ob_size 维护的是存储的元素个数，所以使用 len 函数获取对象长度是一个 O(1) 的操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 小结","id":"16","title":"小结"},"160":{"body":"将列表中的元素全部清空，让列表回到初始状态。 // Objects/clinic/listobject.c.h\n#define LIST_CLEAR_METHODDEF \\ {\"clear\", (PyCFunction)list_clear, METH_NOARGS, list_clear__doc__}, 它由 list_clear 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_clear(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_clear_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_clear_impl(PyListObject *self)\n{ _list_clear(self); Py_RETURN_NONE;\n} static int\n_list_clear(PyListObject *a)\n{ Py_ssize_t i; PyObject **item = a->ob_item; if (item != NULL) { // 获取列表的长度 i = Py_SIZE(a); // 将 ob_size 设置为 0 Py_SIZE(a) = 0; // ob_item 设置为 NULL a->ob_item = NULL; // 将容量设置为 0 a->allocated = 0; // 将列表中每个元素指向的对象的引用计数减 1 while (--i >= 0) { Py_XDECREF(item[i]); } // 释放底层数组所占的内存 PyMem_FREE(item); } return 0;\n} 过程非常简单，当列表为空时，除了将 ob_size 和 allocated 设置为 0 之外，还会将底层数组释放掉，减少内存占用。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » clear：清空列表","id":"160","title":"clear：清空列表"},"161":{"body":"调用列表的 copy 方法，可以将列表拷贝一份。 // Objects/clinic/listobject.c.h\n#define LIST_COPY_METHODDEF \\ {\"copy\", (PyCFunction)list_copy, METH_NOARGS, list_copy__doc__}, 它由 list_copy 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_copy(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_copy_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_copy_impl(PyListObject *self)\n{ // 调用 list_slice，也就是基于切片获取元素 // 所以 data.copy() 等价于 data[:] return list_slice(self, 0, Py_SIZE(self));\n} static PyObject *\nlist_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)\n{ // 指向创建的新列表 PyListObject *np; // 指向列表的底层数组的首元素 PyObject **src, **dest; Py_ssize_t i, len; // 创建的新列表的长度 len = ihigh - ilow; // 创建底层数组长度为 len 的列表 np = (PyListObject *) list_new_prealloc(len); if (np == NULL) return NULL; src = a->ob_item + ilow; dest = np->ob_item; // 将原始列表中的元素依次拷贝到新列表中 for (i = 0; i < len; i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 len Py_SIZE(np) = len; // 转成泛型指针之后返回 return (PyObject *)np;\n} 过程非常简单，但列表的 copy 方法或者说 data[:] 这种叫做列表的浅拷贝。关于列表的深浅拷贝也是初学者容易犯的错误之一，我们看一个 Python 的例子。 data = [[]] # 默认是浅拷贝，这个过程会创建一个新列表\n# 但我们说列表里面的元素都是指针，因此只会将里面的指针拷贝一份\n# 而指针指向的内存并没有拷贝\ndata_cp = data.copy() # 两个对象的地址是一样的\nprint(id(data[0]), id(data[0])) \"\"\"\n1338344668224 1338344668224\n\"\"\" # 操作 data[0], 会改变 data_cp[0]\ndata[0].append(123)\nprint(data, data_cp)\n\"\"\"\n[[123]] [[123]]\n\"\"\" # 操作 data_cp[0]，会改变 data[0]\ndata_cp[0].append(456)\nprint(data, data_cp)\n\"\"\"\n[[123, 456]] [[123, 456]]\n\"\"\" 之所以会有这样的现象，是因为 Python 的变量、容器里面的元素都是泛型指针 PyObject *，在传递的时候会传递指针， 但是在操作的时候会操作指针指向的内存。所以 data.copy() 就是创建了一个新列表，然后把元素拷贝了过去，只不过元素都是指针。因为只是拷贝指针，没有拷贝指针指向的对象（内存），因此它们指向的是同一个对象。 但如果我们就想在拷贝指针的同时也拷贝指针指向的对象呢？答案是使用一个叫 copy 的模块。 import copy data = [[]]\n# 此时拷贝的时候，会把指针指向的对象也给拷贝一份\ndata_cp1 = copy.deepcopy(data)\ndata_cp2 = data[:] data[0].append(123)\nprint(data_cp1) # [[]]\nprint(data_cp2) # [[123]] # data[:] 这种方式也是浅拷贝，所以修改 data[0]，会影响 data_cp2[0]\n# 但是没有影响 data_cp1[0]，证明它们是相互独立的，因为指向的是不同的对象 浅拷贝示意图如下： 里面的两个指针数组存储的元素是一样的，都是同一个对象的地址。 深拷贝示意图如下： 里面的两个指针数组存储的元素是不一样的，因为是不同对象的地址。 注意：copy.deepcopy 虽然在拷贝指针的同时会将指针指向的对象也拷贝一份，但这仅仅是针对可变对象，而不可变对象是不会拷贝的。 import copy data = [[], \"古明地觉\"]\ndata_cp = copy.deepcopy(data) print(data[0] is data_cp[0]) # False\nprint(data[1] is data_cp[1]) # True 为什么会这样，其实原因很简单。因为不可变对象是不支持本地修改的，你若想修改只能创建新的对象并指向它。但这对其它的变量而言则没有影响，其它变量该指向谁就还指向谁。 因为 b = a 只是将 a 存储的对象的指针拷贝一份给 b，然后 a 和 b 都指向了同一个对象，至于 a 和 b 本身则是没有任何关系的。如果此时 a 指向了新的对象，是完全不会影响 b 的，b 还是指向原来的对象。 因此，如果一个指针指向的对象不支持本地修改，那么深拷贝不会拷贝对象本身，因为指向的是不可变对象，所以不会有修改一个影响另一个的情况出现。 关于列表还有一些陷阱： data = [[]] * 5\ndata[0].append(1)\nprint(data) # [[1], [1], [1], [1], [1]]\n# 列表乘上一个 n，等于把列表里面的元素重复 n 次\n# 但列表里面存储的是指针，也就是将指针重复 n 次\n# 所以上面的列表里面的 5 个指针存储的地址是相同的\n# 也就是说，它们都指向了同一个列表 # 这种方式创建的话，里面的指针都指向了不同的列表\ndata = [[], [], [], [], []]\ndata[0].append(1)\nprint(data) # [[1], [], [], [], []] # 再比如字典，在后续系列中会说\nd = dict.fromkeys([1, 2, 3, 4], [])\nprint(d) # {1: [], 2: [], 3: [], 4: []}\nd[1].append(123)\nprint(d) # {1: [123], 2: [123], 3: [123], 4: [123]}\n# 它们都指向了同一个列表 类似的陷阱还有很多，因此在工作中要注意，否则一不小心就会出现大问题。 总之记住三句话： 虽然 Python 一切皆对象，但我们拿到的其实是指向对象的指针； 变量在传递的时候本质上是将对象的指针拷贝一份，所以 Python 是变量的赋值传递、对象的引用传递； 操作变量（指针）的时候，会自动操作变量（指针）指向的内存。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » copy：列表的拷贝","id":"161","title":"copy：列表的拷贝"},"162":{"body":"到此关于列表的内容就介绍完了，作为 Python 中的万能容器，我们可以自由地添加、修改和删除元素。但在使用的时候要了解它的底层结构以及元素是如何存储的，应该在什么场景下使用列表，它的每个方法的时间复杂度是多少。 下一篇文章来介绍元组，或许你觉得自己在代码中很少创建元组，但其实它无处不在。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 小结","id":"162","title":"小结"},"163":{"body":"本篇文章来聊一聊元组，元组可以简单理解为不支持元素添加、修改、删除等操作的列表，也就是在列表的基础上移除了增删改操作。 所以从功能上来讲，元组只是列表的子集，那元组存在的意义是什么呢？首先元组可以作为字典的 key 以及集合的元素，因为字典和集合使用的数据结构是哈希表，它存储的元素一定是可哈希的，关于字典和集合我们后续章节会说。 而列表可以动态改变，所以列表不支持哈希。因此当我们希望字典的 key 是一个序列时，显然元组再适合不过了。比如要根据年龄和身高统计人数，那么就可以将年龄和身高组成元组作为字典的 key，人数作为字典的 value。所以元组可哈希，能够作为哈希表的 key，是元组存在的意义之一。当然元组还有其它作用，我们稍后再说。 元组如果可哈希，那么元组存储的元素必须都是可哈希的。只要有一个元素不可哈希，那么元组就会不可哈希。比如元组里面存储了一个列表，由于列表不可哈希，导致存储了列表的元组也会变得不可哈希。","breadcrumbs":"38. 解密元组的实现原理 » 楔子","id":"163","title":"楔子"},"164":{"body":"根据我们使用元组的经验，可以得出元组是一个变长对象，但同时又是一个不可变对象。 // Include/cpython/tupleobject.h\ntypedef struct { PyObject_VAR_HEAD PyObject *ob_item[1];\n} PyTupleObject; 以上是元组在底层对应的结构体，包含引用计数、类型、ob_size、指针数组。然后数组声明的长度虽然是 1，但我们可以当成 n 来用。然后我们再通过结构体的定义，来对比一下它和列表的区别。 元组没有 allocated、也就是容量的概念，这是因为它是不可变的，不支持 resize 操作。 元组对应的指针数组是定义在结构体里面的，可以直接对数组进行操作。而列表对应的指针数组是定义在结构体外面的，两者通过二级指针进行关联，也就是通过二级指针来间接操作指针数组。 至于为什么要这么定义，我们在最开始介绍对象模型的时候也说得很详细了。可变对象的具体元素不会保存在结构体内部，而是会维护一个指针，指针指向的内存区域负责存储元素。当发生扩容时，只需改变指针指向即可，从而方便内存管理。 基于结构体的定义，我们也能分析出元组所占的内存大小，显然它等于 24 + 8 * 元组长度。 >>> ().__sizeof__()\n24\n>>> (1,).__sizeof__()\n32\n>>> (1, 2).__sizeof__()\n40 结果没有问题。","breadcrumbs":"38. 解密元组的实现原理 » 元组的底层结构","id":"164","title":"元组的底层结构"},"165":{"body":"元组支持的操作我们就不看了，因为它只支持查询操作，并且和列表是高度相似的。这里我们直接来看元组的创建过程。正如列表一样，解释器为创建 PyTupleObject 也提供了类似的初始化方法，即 PyTuple_New。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // 参数 size 表示元组的长度 // op 指向创建的元组 PyTupleObject *op; // 循环变量 Py_ssize_t i; // size 必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // PyTuple_MAXSAVESIZE 是一个宏，显然和缓存池相关 // 关于缓存池我们一会儿再说\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { free_list[size] = (PyTupleObject *) op->ob_item[0]; numfree[size]--; _Py_NewReference((PyObject *)op); } else\n#endif // 当不使用缓存池时，要在系统堆上申请内存 { // size * sizeof(PyObject *) + sizeof(PyTupleObject) 便是元组大小 // 该值不能超过 PY_SSIZE_T_MAX，否则报错 if ((size_t)size > ((size_t)PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)) / sizeof(PyObject *)) { return PyErr_NoMemory(); } // 为 PyTupleObject 和长度为 size 的指针数组申请内存 // 然后将它的类型设置为 &PyTuple_Type，将 ob_size 设置为 size op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size); if (op == NULL) return NULL; } // 将指针数组中所有元素设置为 NULL for (i=0; i < size; i++) op->ob_item[i] = NULL;\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); /* extra INCREF so that this is never freed */ }\n#endif // 让 GC 进行跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 相信这种代码逻辑现在对你来说已经没有任何难度了，另外源码中还有几个宏，不过不重要，因此这里直接去掉了。 以上就是元组创建的过程，但里面隐藏了很多的细节没有说，下面我们来介绍元组的缓存池，然后将细节一一揭开。","breadcrumbs":"38. 解密元组的实现原理 » 元组是怎么创建的？","id":"165","title":"元组是怎么创建的？"},"166":{"body":"元组的缓存池也是通过数组来实现的。 // Objects/tupleobject.c #define PyTuple_MAXSAVESIZE 20\n#define PyTuple_MAXFREELIST 2000 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];\nstatic int numfree[PyTuple_MAXSAVESIZE]; 里面出现了两个宏： PyTuple_MAXSAVESIZE：缓存池的大小，默认为 20； PyTuple_MAXFREELIST：缓存池的每个元素都对应一条链表，该宏表示每条链表最多容纳多少个节点（稍后解释）； 从定义中可以看到，元组的缓存池大小是 20，而我们之前介绍的列表的缓存池大小是 80。但这里的 20 和 80 还稍微有些不同，80 指的是列表缓存池的大小，除此之外没有别的含义。而 20 除了表示元组缓存池的大小之外，它还表示只有当元组的长度小于 20，回收时才会被放入缓存池。 当元组的长度为 n 时（其中 n < 20)，那么在回收的时候该元组就会放在缓存池中索引为 n 的位置。假设回收的元组长度为 6，那么就会放在缓存池索引为 6 的位置。 但是问题来了，如果要回收两个长度为 6 的元组该怎么办？很简单，像链表一样串起来就好了。所以 free_list 里面虽然存储的是 PyTupleObject *，但每个 (PyTupleObject *)->ob_item[0]都存储了下一个 PyTupleObject *。 因此你可以认为 free_list 存储了 20 条链表的头结点的指针，每条链表上面挂着具有相同 ob_size 的 PyTupleObject。比如 free_list[n] 便指向了长度为 n 的 PyTupleObject 组成的链表的头结点，至于每条链表的节点个数由 numfree 维护，并且最大不能超过 PyTuple_MAXFREELIST，默认是 2000。 这里再来重新捋一下，元组的缓存池是一个数组，并且索引为 n 的位置回收的是元素个数（ob_size）为 n 的元组，并且 n 不超过 20。但这样的话，具有相同长度的元组不就只能缓存一个了吗？比如我们有很多个长度为 2 的元组都要缓存怎么办呢？显然将它们以链表的形式串起来即可，正如图中显示的那样。至于长度为 n 的元组究竟缓存了多少个，则由 numfree[n] 负责维护。假设 free_list[2] 这条链表上挂了 1000 个 PyTupleObject，那么 numfree[2] 就等于 1000，即长度为 2 的元组被缓存了 1000 个。 当再回收一个长度为 2 的元组时，那么会让该元组的 ob_item[0] 等于 free_list[2]，然后 free_list[2] 等于该元组、numfree[2]++。所以这里的每一条链表和浮点数缓存池是类似的，也是采用的头插法。 我们看一下放入缓存池的具体过程，显然这一步发生在元组销毁的时候。 // Objects/tupleobject.c\nstatic void\ntupledealloc(PyTupleObject *op)\n{ // 循环变量 Py_ssize_t i; // 回收的元组的长度 Py_ssize_t len = Py_SIZE(op); // 让 GC 不再跟踪 PyObject_GC_UnTrack(op); // 延迟释放，和列表是类似的 Py_TRASHCAN_BEGIN(op, tupledealloc) if (len > 0) { i = len; // 减少内部元素指向对象的引用计数，因为元组不再持有对它们的引用 while (--i >= 0) Py_XDECREF(op->ob_item[i]);\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度必须小于 20，即元组长度不超过 20 // 并且 numfree[index] 必须小于 2000，即每条链表最多缓存 2000 个元组 if (len < PyTuple_MAXSAVESIZE && numfree[len] < PyTuple_MAXFREELIST && Py_TYPE(op) == &PyTuple_Type) { // ob_item[0] 充当了链表的 next 指针 // 这里让 op->ob_item[0] 等于 free_list[index] // 然后让 free_list[index] 等于 op // 这样元组就缓存起来了，并成为链表新的头结点，即 free_list[index] op->ob_item[0] = (PyObject *) free_list[len]; // 然后维护一下链表的节点个数 numfree[len]++; free_list[len] = op; goto done; /* return */ }\n#endif } // 如果元组长度大于等于 20，或者缓存池已满，那么释放内存 Py_TYPE(op)->tp_free((PyObject *)op);\ndone: Py_TRASHCAN_END\n} tupledealloc 函数在销毁元组时，会尝试放入缓存池中。那么同理，在创建元组时，也会尝试从缓存池中获取。我们再回过头看一下 PyTuple_New 这个函数，重新解释一下里面的细节。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // ...\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度为 0 时比较特殊，一会单独说 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } // 当 0 < size < 20 时，直接通过 op = free_list[size] 从缓存池获取 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { // 元组取走后，别忘记让 free_list[size] 指向下一个元素 // 也就是 (PyTupleObject *) op->ob_item[0] free_list[size] = (PyTupleObject *) op->ob_item[0]; // 维护对应的链表长度 numfree[size]--; // 引用计数初始化为 1 _Py_NewReference((PyObject *)op); } else\n#endif // ...\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); }\n#endif _PyObject_GC_TRACK(op); return (PyObject *) op;\n} 到此，相信你已经明白元组的缓存池到底是怎么一回事了，说白了就是有 20 条链表，索引为 n 的链表存放长度为 n 的元组，因此可回收的元组的最大长度是 19。然后每条链表的长度小于 2000，也就是具有相同长度的元组最多回收 2000 个。至于链表的 next 指针，则由元组的 ob_item[0] 来充当，通过 ob_item[0] 来获取下一个元素。 >>> tpl = (1, 2, 3)\n>>> print(id(tpl))\n2279295395264\n>>>\n>>> del tpl # 放入缓存池\n>>>\n>>> tpl = (\"古明地觉\", \"古明地恋\", \"芙兰朵露\")\n>>> print(id(tpl))\n2279295395264 可以看到打印的地址是一样的，因为第一次创建的元组被重复利用了。 另外我们说缓存池的长度为 20，会缓存长度为 0 ~ 19 的元组，每种规格的元组最多缓存 2000 个。其实这个说法不太严谨，应该说长度为 1 ~ 19 的元组会缓存 2000 个。如果元组长度为 0，那么它对应的链表只会容纳一个元素，这也说明了不管我们创建多少个空元组，最终在内存中只会存在一个。 tpl1 = ()\ntpl2 = ()\ntpl3 = () print(id(tpl1) == id(tpl2) == id(tpl3)) # True 再来看看 PyTuple_New 这个函数： 从缓存池中获取之后只是增加了引用计数，因为长度为 0 的元组只会缓存一个。所以空元组可以认为是单例的，只有一份。 那么问题来了，为什么元组缓存池可以缓存的元组个数会这么多，每个链表缓存 2000 个，有 20 条链表，总共可以缓存将近 40000 个。这么做的原因就是，元组的使用频率远比我们想象的广泛，主要是它大量使用在我们看不到的地方。比如多元赋值： a, b, c, d = 1, 2, 3, 4 在编译时，上面的 1, 2, 3, 4 实际上是作为元组被加载的，整个赋值相当于元组的解包。再比如函数、方法的返回值，如果是多返回值，本质上也是包装成一个元组之后再返回。 所以元组缓存池能缓存的对象个数，要远大于其它对象的缓存池。可以想象一个大型项目，里面的函数、方法不计其数，只要是多返回值，就会涉及到元组的创建，因此每种长度的元组缓存 2000 个是很合理的。当然如果长度达到了 20，就不会缓存了，这种元组的使用频率没有那么高。 然后再回顾一下元组的回收过程，会发现它和列表有一个很大的不同。列表在被回收时，它的指针数组会被释放；但元组不同，它在被回收时，底层的指针数组会保留，并且还巧妙地通过索引来记录了回收的元组的大小规格。元组的这项技术也被称为静态资源缓存，因为元组在执行析构函数时，不仅对象本身没有被回收，连底层的指针数组也被缓存起来了。那么当再次分配时，速度就会快一些。 from timeit import timeit t1 = timeit(stmt=\"x1 = [1, 2, 3, 4, 5]\", number=1000000)\nt2 = timeit(stmt=\"x2 = (1, 2, 3, 4, 5)\", number=1000000) print(round(t1, 2)) # 0.05\nprint(round(t2, 2)) # 0.01 可以看到耗时，元组只是列表的五分之一。这便是元组的另一个优势，可以将资源缓存起来。而缓存的原因还是如上面所说，因为涉及大量的创建和销毁，所以这一切都是为了加快内存分配。 由于对象都在堆区，为了效率，Python 不得不大量使用缓存的技术。","breadcrumbs":"38. 解密元组的实现原理 » 元组的缓存池","id":"166","title":"元组的缓存池"},"167":{"body":"以上就是元组相关的内容，因为有了列表相关的经验，再来看元组就会快很多。当然啦，元组的一些操作我们没有说，因为和对应的列表操作是类似的。 最后再补充一下，列表是有 __init__ 方法的，而元组没有。 元组的 __init__ 直接继承 object.__init__。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"38. 解密元组的实现原理 » 小结","id":"167","title":"小结"},"168":{"body":"Python 的字典是一种映射型容器对象，保存了键（key）到值（value）的映射关系。通过字典，我们可以实现快速查找，JSON 这种数据结构也是借鉴了 Python 的字典。另外字典是经过高度优化的，因为 Python 底层也在大量地使用字典。 在 Python 里面我们要如何创建一个字典呢？ # 创建一个字典\nd = {\"a\": 1, \"b\": 2}\nprint(d) # {'a': 1, 'b': 2} # 或者我们还可以调用 dict，传入关键字参数即可\nd = dict(a=1, b=2, c=3, d=4)\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然 dict 里面还可以接收位置参数，但是最多接收一个\nd1 = dict({\"a\": 1, \"b\": 2}, c=3, d=4)\nd2 = dict([(\"a\", 1), (\"b\", 2)], c=3, d=4)\nprint(d1) # {'a': 1, 'b': 2, 'c': 3, 'd': 4}\nprint(d2) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 还可以根据已有字典创建新的字典\nd = {**{\"a\": 1, \"b\": 2}, \"c\": 3, **{\"d\": 4}}\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然通过调用 dict 也是可以的\n# 但是注意：** 这种方式本质上是把字典变成多个关键字参数\n# 所以里面的 key 一定要符合 Python 的变量命名规范\nd = dict(**{\"a\": 1, \"b\": 2}, c=3, **{\"d\": 4})\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} try: # 这种是不合法的，因为 **{1: 1} 等价于 1=1 d = dict(**{1: 1})\nexcept Exception as e: print(e) # keywords must be strings\n# 但下面是合法的\nd = {**{1: 1, 2: 2}}\nprint(d) # {1: 1, 2: 2} 字典的底层是借助哈希表实现的，关于哈希表我们一会儿说，总之字典添加元素、删除元素、查找元素等操作的平均时间复杂度是 O(1)。 我们来测试一下字典的执行效率吧，看看它和列表之间的区别。 import time\nimport numpy as np def test(count: int, value: int): \"\"\" :param count: 循环次数 :param value: 查询的元素 :return: \"\"\" # 包含一千个随机数的列表 lst = list(np.random.randint(0, 2 ** 30, size=1000)) # 基于列表构建一个字典 d = dict.fromkeys(lst) # 查询元素 value 是否在列表中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in lst t2 = time.perf_counter() print(\"列表查询耗时:\", round(t2 - t1, 2)) # 查询元素 value 是否在字典中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in d t2 = time.perf_counter() print(\"字典查询耗时:\", round(t2 - t1, 2)) # 分别查询一千次、一万次、十万次、二十万次\ntest(10 ** 3, 22333)\n\"\"\"\n列表查询耗时: 0.13\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 4, 22333)\n\"\"\"\n列表查询耗时: 1.22\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 5, 22333)\n\"\"\"\n列表查询耗时: 12.68\n字典查询耗时: 0.01\n\"\"\"\ntest(10 ** 5 * 2, 22333)\n\"\"\"\n列表查询耗时: 25.72\n字典查询耗时: 0.01\n\"\"\" 字典的查询速度非常快，从测试中我们看到，随着循环次数越来越多，列表所花费的总时间越来越长。但是字典由于查询所花费的时间极少，查询速度非常快，所以即便循环 50 万次，花费的总时间也不过才 0.01 秒左右。 此外字典还有一个特点，就是它的快不会受到数据量的影响，从含有一万个键值对的字典中查找，和从含有一千万个键值对的字典中查找，两者花费的时间几乎是没有区别的。 那么哈希表到底是什么样的数据结构，为什么能这么快呢？下面来分析一下。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 楔子","id":"168","title":"楔子"},"169":{"body":"映射型容器的使用场景非常广泛，基本上所有的主流语言都支持。例如 C++ 里面的 map 就是一种映射型容器，但它是基于红黑树实现的。红黑树是一种平衡二叉树，元素的插入、删除、查询等操作的时间复杂度均为 O(logN)，另外 Linux 的 epoll 也使用了红黑树。 而对于 Python 来讲，映射型容器指的就是字典，我们说字典在 Python 内部是被高度优化的。因为不光我们在用，虚拟机在运行时也在大量使用，比如类对象、自定义类的实例对象都有自己的属性字典，还有全局变量也是通过字典存储的。因此基于以上种种原因，Python 对字典的性能要求会更加苛刻。 所以 Python 字典采用的数据结构，在添加、删除、查询元素等方面肯定是要优于红黑树的，没错，就是哈希表。其原理是将 key 通过哈希函数进行运算，得到一个哈希值，再将这个哈希值映射成索引。 我们举例说明： 我们发现除了 key、value 之外，还有一个 index，因为哈希表本质上也是使用了索引。虽然数组在遍历的时候是个时间复杂度为 O(n) 的操作，但通过索引定位元素则是一个 O(1) 的操作，不管数组有多长，通过索引总是能瞬间定位到指定元素。 所以哈希表本质上就是一个数组，通过将 key 映射成一个数值，作为数组的索引，然后将键值对存在数组里面。至于它是怎么映射的，我们后面再谈，现在就假设是按照我们接下来说的方法映射的。 比如这里有一个能容纳 8 个元素的字典，如上图所示。我们先设置 d[\"koishi\"]=79，那么会对 \"koishi\" 这个字符串进行哈希运算，得到一个哈希值，然后再让哈希值对当前的总容量进行取模，这样的话是不是能够得到一个小于 8 的数呢？假设是 3，那么就存在索引为 3 的位置。 然后 d[\"scarlet\"]=95，按照同样的规则运算得到 6，那么就存在索引为 6 的位置；同理第三次设置 d[\"satori\"]=80，对字符串 satori 进行哈希、取模，得到 1，那么存储在索引为 1 的位置。 同理当我们根据键来获取值的时候，比如：d[\"satori\"]，那么同样会对字符串 \"satori\" 进行哈希、取模，得到索引发现是1，然后就把索引为 1 的 value 给取出来。 当然这种方式肯定存在缺陷，比如： 不同的 key 进行哈希、取模运算之后得到的结果一定是不同的吗？ 在运算之后得到索引的时候，发现这个位置已经有人占了怎么办？ 取值的时候，索引为 1，可如果索引为 1 对应的 key 和我们指定的 key 不一致怎么办？ 所以哈希运算是会冲突的，如果冲突，那么 Python 底层会改变策略重新映射，直到映射出来的索引没有人用。比如我们设置一个新的键值对 d[\"tomoyo\"]=88，可是 \"tomoyo\" 这个 key 映射之后得到的结果也是 1，而索引为 1 的地方已经被 key 为 \"satori\" 的键值对给占了，那么 Python 就会改变规则来对 \"tomoyo\" 重新映射，直到找到一个空位置。 但如果我们再次设置 d[\"satori\"]=100，那么对 satori 映射得到的结果也是 1，而 key 是一致的，那么就会把对应的值进行修改。 同理，当我们获取值的时候，比如 d[\"tomoyo\"]，那么对 key 进行映射，得到索引。但是发现该索引对应的 key 不是 \"tomoyo\" 而是 \"satori\"，于是改变规则（这个规则跟设置 key 冲突时，采用的规则是一样的），重新映射，得到新的索引，然后发现 key 是一致的，于是将值取出来。 所以从这里就已经能说明问题了，就是把 key 转换成数组的索引。可能有人问，这些键值对貌似不是连续的啊。对的，肯定不是连续的。并不是说你先存，你的索引就小、就在前面，这是由 key 进行哈希运算之后的结果决定的。 另外哈希表、或者说字典也会扩容，并且它还不是像列表那样，容量不够才扩容，而是当键值对个数达到容量的三分之二的时候就会扩容。 因为字典不可能会像列表那样，键值对之间是连续、一个一个挨在一起的。既然是哈希运算，得到的哈希值肯定是随机的，再根据哈希值映射出的索引也是随机的。那么在键值对个数达到容量三分之二的时候，计算出来的索引发生碰撞的概率会非常大，不可能等到容量不够了再去扩容，而是在键值对个数达到容量的三分之二时就要扩容，也就是申请一个更大的哈希表。 一句话总结：哈希表就是一种空间换时间的方法。 假设容量为 1024，那么就相当于数组有 1024 个位置，每个 key 都会映射成索引，找到自己的位置，将键值对存在里面。但很明显各自的位置是不固定的，肯定会空出来很多，但是无所谓，只要保证通过索引能在相应的位置找到它即可。 大量的文字会有些枯燥，我们用两张图来解释一下设置元素和获取元素的整个过程。 以上是设置元素，还是比较清晰的，果然图像是个好东西。再来看看获取元素： 以上就是哈希表的基本原理，说白了它就是个数组。存储键值对的时候，先将 key 映射成索引，然后基于索引找到数组中的指定位置，将键值对存进去。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 什么是哈希表","id":"169","title":"什么是哈希表"},"17":{"body":"通过 PyObject 和 PyVarObject，我们看到了所有对象的公共信息以及变长对象的公共信息。任何一个对象，不管它是什么类型，内部必有引用计数（ob_refcnt）和类型指针（ob_type）。任何一个变长对象，不管它是什么类型，内部除了引用计数和类型指针之外，还有一个表示元素个数的 ob_size。 显然目前没有什么问题，一切都是符合预期的，但是当我们顺着时间轴回溯的话，就会发现端倪。比如： 当在内存中创建对象、分配空间的时候，解释器要给对象分配多大的空间？显然不能随便分配，那么对象的内存信息在什么地方？ 对象是可以执行相关操作的，解释器怎么知道某个对象支持哪些操作呢？再比如一个整数可以和一个整数相乘，一个列表也可以和一个整数相乘，即使是相同的操作，但不同类型的对象执行也会有不同的效果，那么此时解释器又是如何进行区分的？ 想都不用想，这些信息肯定都在对象的类型对象中。因为占用的空间大小实际上是对象的一个元信息，这样的元信息和其所属类型是密切相关的，因此它一定会出现在与之对应的类型对象当中。至于支持的操作就更不用说了，我们平时自定义类的时候，功能函数都写在什么地方，显然都是写在类里面，因此一个对象支持的操作也定义在类型对象当中。 而将对象和它的类型对象关联起来的，毫无疑问正是该对象内部的 PyObject 的 ob_type 字段，也就是类型指针。我们通过对象的 ob_type 字段即可获取类型对象的指针，然后通过指针获取存储在类型对象中的某些元信息。 下面我们来看看类型对象在底层是怎么定义的。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 楔子","id":"17","title":"楔子"},"170":{"body":"目前介绍的正是 Python 早期所采用的哈希表，但是它有一个严重的问题，就是内存浪费严重。下一篇文章我们就来看看字典的底层结构，以及 Python 是如何对哈希表进行优化的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 小结","id":"170","title":"小结"},"171":{"body":"本篇文章来剖析一下字典的底层结构，看看它是怎么设计的，以及在设计的过程中都需要做哪些考量。另外字典是基于哈希表实现的，而传统的哈希表存在内存浪费的问题，那么字典又是如何优化的呢？带着这些问题，开始今天的内容。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 楔子","id":"171","title":"楔子"},"172":{"body":"Python 一切皆对象，字典也不例外，它在底层也由某个结构体表示。 // Include/cpython/dictobject.h\ntypedef struct { PyObject_HEAD Py_ssize_t ma_used; uint64_t ma_version_tag; PyDictKeysObject *ma_keys; PyObject **ma_values;\n} PyDictObject; 解释一下里面的字段的含义： PyObject_HEAD：对象的头部信息，里面包含了对象的引用计数和类型。 ma_used：字典的长度，它充当了 ob_size。 ma_version_tag：字典的版本号，对字典的每一次修改都会导致其改变。该字段主要用于字典的迭代器，以检测字典在迭代过程中是否被修改。 ma_keys：从定义上来看它是一个指针，指向了 PyDictKeysObject。而 Python 里面的哈希表分为两种，分别是 combined table 和 split table，即结合表和分离表。如果是结合表，那么键值对全部由 ma_keys 维护，此时 ma_values 为 NULL。 ma_values：如果是分离表，那么键由 ma_keys 维护，值由 ma_values 维护。而 ma_values 是一个二级指针，指向 PyObject * 类型的指针数组的首元素。 这里先解释一下结合表和分离表的由来。结合表的话，键和值会存在一起；分离表的话，键和值会存在不同的地方。那么问题来了，为什么要将哈希表分为两种呢？事实上，早期的哈希表只有结合表这一种，并且现在创建一个字典使用的也是结合表。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d = {\"a\": 1, \"b\": 2}\nprint( PyDictObject.from_address(id(d)).ma_values\n) # None 我们看到 ma_values 打印的结果是一个 None，证明是结合表，值不是由 ma_values 维护，而是和键一起，都由 ma_keys 负责维护。 而分离表是在 PEP-0412 中被引入的，主要是为了提高内存使用率，也就是让不同的字典共享相同的一组 key。比如自定义类的实例对象，它们默认都有自己的属性字典，如果对某个类多次实例化，那么改成分离表会更有效率。因为它们的属性名称是相同的，完全可以共享同一组 key；如果是结合表，那么每个实例的属性字典都要将相同的 key 单独保存一次，这显然是一种浪费。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] class A: pass a1 = A()\na2 = A() # 因为类型指定的是 void *，所以打印的结果是一串地址\n# 但我们看到输出不为 None，说明采用的确实是分离表\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_values, PyDictObject.from_address(id(a2.__dict__)).ma_values\n) # 139672411587664 139672411587280 # 然后再查看 ma_keys，既然是共享同一组 key\n# 那么打印的地址应该是一样的\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_keys, PyDictObject.from_address(id(a2.__dict__)).ma_keys\n) # 139672411702528 139672411702528 # 结果确实是一样的，不同实例对象的属性字典里面的 key 是共享的\n# 因为是同一个类的实例对象，属性字典的 key 是相同的，所以没必要将同一组 key 保存多次 以上就是结合表和分离表之间的区别，只需要知道分离表是 Python 为了提高内存使用率而专门引入的即可。我们平时自己创建的字典，使用的都是结合表，因此我们的重点也将会放在结合表身上。 而结合表的话，键值都由 ma_keys 维护，它是一个指向 PyDictKeysObject 的指针，因此玄机就隐藏在这个结构体里面。 // Include/cpython/dictobject.h\ntypedef struct _dictkeysobject PyDictKeysObject; // Objects/dict-common.h\nstruct _dictkeysobject { // key 的引用计数，也就是 key 被多少个字典所使用 // 如果是结合表，那么该字段始终是 1，因为结合表独占一组 key // 如果是分离表，那么该字段大于等于 1，因为分离表可以共享一组 key Py_ssize_t dk_refcnt; // 哈希表的大小、或者说长度，注意：dk_size 满足 2 的 n 次方 // 这样可将取模运算优化成按位与运算，也就是将 num % dk_size 优化成 num & (dk_size - 1) Py_ssize_t dk_size; // 哈希函数，用于计算 key 的哈希值，然后映射成索引 // 一个好的哈希函数应该尽可能少的产生冲突，并且哈希函数对哈希表的性能起着至关重要的作用 // 所以底层的哈希函数有很多种，会根据对象的种类选择最合适的一个 dict_lookup_func dk_lookup; // 键值对数组还可以添加多少个 entry（键值对） // 关于什么是键值对数组，以及它和哈希索引数组之间有什么区别，稍后会解释 Py_ssize_t dk_usable; // 键值对数组里面已经添加了多少个键值对 Py_ssize_t dk_nentries; // 哈希索引数组 char dk_indices[]; // 注：dk_indices 后面其实还有一个字段 dk_entries，只不过没有写在结构体里面 // 从字段名也可以看出，它表示键值对数组，因此它的类型就是个数组 // 然后数组里面存储的是键值对（entry），而键值对在底层由 PyDictKeyEntry 结构体实现 // 所以你可以认为 char dk_indices[] 的下面还有一个 PyDictKeyEntry dk_entries[]\n}; 字典的定义还是稍微有点复杂的，如果目前感到困惑，没有关系，稍后我们会一点点解释清楚。这里再来看看键值对长什么样子。 // Objects/dict-common.h\ntypedef struct { Py_hash_t me_hash; PyObject *me_key; PyObject *me_value;\n} PyDictKeyEntry; 显然 me_key 和 me_value 指向了键和值，我们之前说 Python 的变量、以及容器内部的元素都是泛型指针 PyObject *，这里也得到了证明。但是我们看到 entry 除了有键和值之外，还有一个 me_hash，它表示键对应的哈希值，这样可以避免重复计算。 至此，字典的整个底层结构就非常清晰了，我们画一张图，然后再来从头解释一下，并解答之前留下的疑问。 字典的真正实现藏在 PyDictKeysObject 中，它的内部包含两个关键数组：一个是哈希索引数组 dk_indices，另一个是键值对数组 dk_entries。 字典维护的键值对（entry）会按照先来后到的顺序保存在键值对数组中，而哈希索引数组则保存键值对在键值对数组中的索引。另外，哈希索引数组中的一个位置我们称之为一个槽，比如图中的哈希索引数组便有 8 个槽，其数量由 dk_size 字段维护。 假设我们创建一个空字典，注意：虽然字典是空的，但是容量已经有了，然后往里面插入键值对 \"komeiji\": 99 的时候，Python 会执行以下步骤： 将键值对保存在 dk_entries 中，由于初始字典是空的，所以会保存在 dk_entries 数组中索引为 0 的位置。 通过哈希函数计算出 \"komeiji\" 的哈希值，然后将哈希值映射成索引，假设是 6。 将 \"键值对\" 在 \"键值对数组\" 中的索引 0，保存在哈希索引数组中索引为 6 的槽里面。 然后当我们在查找键 \"komeiji\" 对应的值的时候，便可瞬间定位。过程如下： 通过哈希函数计算出 \"komeiji\" 的哈希值，然后映射成索引。因为在设置的时候索引是 6，所以在获取时，映射出来的索引肯定也是 6。 找到哈希索引数组中索引为 6 的槽，得到其保存的 0，这里的 0 对应键值对数组的索引。 找到键值对数组中索引为 0 的位置存储的 entry，然后判断 entry->me_key 和查找的 key 是否一致，不一致则重新映射。如果一致，则取出 me_value，然后返回。 由于哈希值计算以及数组索引查找均是 O(1) 的时间复杂度，所以字典的查询速度才会这么快。 另外前面介绍哈希表的时候，为了避免牵扯太多，说得相对简化了。比如 \"xxx\": 80，假设 \"xxx\" 映射出来的索引是 2，那么键值对就直接存在索引为 2 的地方。这实际上是简化了，因为这相当于把哈希索引数组和键值对数组组合在一块了，而早期的 Python 也确实是这么做的。 但是从上面字典的结构图中我们看到，实际上是先将键值对按照先来后到的顺序存在一个数组（键值对数组）中，然后再将它在键值对数组中的索引存放在另一个数组（哈希索引数组）的某个槽里面，因为 \"xxx\" 映射出来的是 2，所以就存在索引为 2 的槽里面。 而在查找的时候，映射出来的索引其实是哈希索引数组的索引。然后索引为 2 的槽又存储了一个索引，这个索引是键值对数组的索引，会再根据该索引从键值对数组里面获取指定的 entry。最后比较 key 是否相同、如果相同则返回指定的 value。 所以能看出两者整体思想是基本类似的，理解起来区别不大，甚至第一种方式实现起来还更简单一些。但为什么要采用后者这种实现方式，以及这两者之间的区别，我们下面来专门分析，之所以采用后者主要是基于内存的考量。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的底层结构","id":"172","title":"字典的底层结构"},"173":{"body":"在早期，哈希表并没有分成两个数组实现，而是只由一个键值对数组实现，这个数组也承担哈希索引数组的角色。 我们看到这种结构不正是我们在介绍哈希表时说的吗？键值对数组不仅负责存储 entry，同时也负责承载映射后的索引，而无需分成两个数组，这种方式似乎更简单、更直观。没错，Python 在早期确实是通过这种方式实现的哈希表，只是这种实现方式有一个弊端，就是太耗费内存了。 前面说了，基于 key 映射出的索引是随机的，所以肯定会存在索引冲突的情况，即不同的 key 映射到了同一个槽。并且随着存储的 entry 增多，冲突也会越频繁，性能也就越差。因此哈希表必须要预留一定的空间，而经过实践表明，预留的空间至少要占总容量的 1/3。换句话说，哈希表存储的 entry 的数量不能超过总容量的 2/3。 // Objects/dictobject.c\n#define USABLE_FRACTION(n) (((n) << 1)/3) 宏 USABLE_FRACTION 会根据哈希表的长度，或者说容量，计算出哈希表可存储的元素个数。以长度为 8 的哈希表为例，最多可以保存 5 个键值对，超出则需要扩容，显然这存在严重的内存浪费。 所以 Python 为了节省内存，想出了一个妙招。既然只能用 2/3，那就将键值对数组的空间变为原来的 2/3，只用来存储键值对（entry），而对 key 进行映射得到的索引则由另一个数组（哈希索引数组）来承载。假设映射出的索引是 4，那么就去找哈希索引数组中索引为 4 的槽，该槽存储的便是键值对在键值对数组中的索引。 之所以这么设计，是因为键值对数组里面一个元素要占用 24 字节，而哈希索引数组在容量不超过 255 的时候，里面一个元素只占一个字节，容量不超过 65535 的时候，里面一个元素只占两个字节，其它以此类推。所以哈希索引数组里面的元素大小比键值对数组要小很多，将哈希表分成两个数组（避免键值对数组的浪费）来实现会更加节省内存。我们可以举个例子计算一下，假设有一个容量为 65535 的哈希表。 如果是通过第一种方式，只用一个数组来存储的话： # 总共需要 1572840 字节\n>>> 65535 * 24\n1572840 # 除以 3, 会浪费 524280 字节\n>>> 65535 * 24 // 3\n524280\n>>> 如果是通过第二种方式，使用两个数组来存储的话： # 容量虽然是 65535\n# 但键值对数组是容量的 2 / 3\n# 然后加上哈希索引数组的大小\n>>> 65535 * 24 * 2 // 3 + 65535 * 2\n1179630\n>>> 所以一个数组存储比两个数组存储要多用 393210 字节的内存，因此 Python 选择使用两个数组来存储。 我们再以长度为 8 的哈希表为例，画一张图对比一下，由于哈希表长度为 8，那么它最多存储 5 个键值对。 如果哈希表只使用一个键值对数组，那么基于 key 映射出的索引就是键值对数组的索引，这种方式简单直观，但内存浪费严重，因为要浪费掉 1/3 的空间。于是为了解决这个问题，哈希表选择使用两个数组实现，分别是哈希索引数组和键值对数组。 哈希索引数组的长度就是哈希表的长度，key 映射之后的索引也是哈希索引数组的索引，只不过它存储的不再是键值对，而是键值对在键值对数组中的索引。那么问题来了，明明多了一个数组，为啥内存占用反而变少了呢？很明显，由于引入了哈希索引数组，键值对数组的长度可以减少到原来的 2/3。 因为相比键值对数组，哈希索引数组的内存占用非常低，引入它需要的成本远小于避免键值对数组浪费 1/3 所带来的收益，所以使用两个数组来实现哈希表是更加合理的。 总结： 哈希表本质上就是个数组，只不过 Python 选择使用两个数组实现，其中哈希索引数组的长度便是哈希表的容量，而该长度由 dk_size 字段维护。 由于哈希表最多使用 2/3，那么就只为键值对数组申请 2/3 容量的空间。对于容量为 8 的哈希表，那么哈希索引数组的长度就是 8，键值对数组的长度就是 5。 dk_usable 字段表示键值对数组还可以容纳的 entry 的个数，所以它的初始值也是 5。 dk_nentries 字段表示当前已存在的 entry 的数量，假设哈希表，或者说键值对数组存储了 3 个键值对，那么 dk_nentries 就是 3。而 dk_usable 则会变成 5 - 3 等于 2，因为它表示键值对数组还可以容纳多少 entry。 咦，前面介绍 PyDictObject 的时候，看到里面有一个 ma_used 字段，表示字典的长度。那么 dk_nentries 和 ma_used 有啥区别呢，从字面意思上看，两者的含义貌似是等价的，关于这一点后续再解释。 最后就是 dk_indices 和 dk_entries，它们表示哈希索引数组和键值对数组。到此我们就把每个字段的含义又重新回顾了一遍，现在再来看是不是就清晰多了呢。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 哈希表的内存优化","id":"173","title":"哈希表的内存优化"},"174":{"body":"我们知道 Python 从 3.6 开始，字典的遍历是有序的，那么这是怎么实现的呢？ 其实很简单，在存储时，虽然映射之后的索引是随机的，但键值对本身始终是按照先来后到的顺序被添加进键值对数组中。而字典在 for 循环时，会直接遍历键值对数组，所以遍历的结果是有序的。但即便如此，我们也不应该依赖此特性。 还是以之前的图为例，我们顺序写入三个键值对，key 分别是 \"a\"、\"b\"、\"c\"： 早期的哈希表只有一个键值对数组，而键值对在存储时本身就是无序的，那么遍历的结果自然也是无序的。对于当前来说，遍历的结果就是 \"b\"、\"a\"、\"c\"。 但从 3.6 开始，键值对数组中的键值对，和添加顺序是一致的。而遍历时，会直接遍历键值对数组，因此遍历的结果是有序的。对于当前来说，遍历的结果就是 \"a\"、\"b\"、\"c\"。 当然，如果你是 Python 的设计者，希望遍历依旧不保持有序的话，那么该怎么做呢？很简单，可以先遍历哈希索引数组，将存储的有效索引依次取出，对于当前来说就是 1、0、2。然后基于这些索引，从键值对数组中获取键值对，那么遍历的结果也是 \"b\"、\"a\"、\"c\"。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典遍历的有序性","id":"174","title":"字典遍历的有序性"},"175":{"body":"下面来分析一下字典占用的内存大小，首先字典和列表一样都有容量的概念，由于空间已经申请了，不管有没有使用，大小都必须算进去。而字典的容量策略相比列表要简单很多，因为大小要满足 2 的 n 次方，所以容量一定按照 8、16、32、64、······ 进行变化。 注意：字典的容量（或者说哈希表的容量）指的是内部哈希索引数组的长度，它要满足 2 的 n 次方，从而将取模运算优化成按位与运算。当哈希索引数组存储的元素（键值对数组的索引）个数达到了总长度的 2/3，同时也意味着键值对数组已经满了，那么说明字典（哈希表）该扩容了。 知道了容量规则，我们来看一下字典的内存大小怎么计算。 typedef struct { PyObject_HEAD // 16 字节 Py_ssize_t ma_used; // 8 字节 uint64_t ma_version_tag; // 8 字节 PyDictKeysObject *ma_keys; // 8 字节 PyObject **ma_values; // 8 字节\n} PyDictObject;\n// 所以 PyDictObject 实例占 48 字节 struct _dictkeysobject { Py_ssize_t dk_refcnt; // 8 字节 Py_ssize_t dk_size; // 8 字节 dict_lookup_func dk_lookup; // 8 字节 Py_ssize_t dk_usable; // 8 字节 Py_ssize_t dk_nentries; // 8 字节 char dk_indices[]; // 隐藏字段 dk_entries\n}; // 如果不算哈希索引数组 dk_indices 和键值对数组 dk_entries\n// 那么 PyDictKeysObject 实例占 40 个字节 然后是剩余的两个数组，一个是哈希索引数组 dk_indices，里面 1 个元素可能占 1 字节、2 字节、或 4 字节；还有一个键值对数组 dk_entries，里面一个元素占 24 字节。所以对于容量为 n 的字典来说： 如果 n < 256，字典大小等于 48 + 40 + n + n * 2 // 3 * 24 如果 256 <= n < 65536，字典大小等于 48 + 40 + n * 2 + n * 2 // 3 * 24 如果 n >= 65536，字典大小等于 48 + 40 + n * 4 + n * 2 // 3 * 24 所以对于一个容量为 8 的字典，它的大小就是 48 + 40 + 8 + 120 = 216。 # 字典的初始容量为 8，所以大小为 216\n>>> dict().__sizeof__()\n216 # 注：如果你是通过字面量的方式创建空字典，那么容量是 0\n# 显然大小就是 48 字节，因为此时 ma_keys 为 NULL\n>>> {}.__sizeof__()\n48 那么问题来了，如果一个字典包含 78 个键值对，那么这个字典占多大内存呢？既然有 78 个键值对，那么键值对数组 dk_entries 的长度至少为 78，而它又等于哈希表容量的 2/3，所以哈希表的长度至少为 117。由于哈希表的长度满足 2 的 n 次幂，所以我们只需找到大于等于 117 的最小 2 的幂次方数即可，显然这个数是 128。 所以大小有了，包含 78 个键值对的字典所占的内存大小等于 48 + 40 + 128 + 128 * 2 // 3 * 24。 >>> 48 + 40 + 128 + 128 * 2 // 3 * 24\n2256\n>>> dict.fromkeys(range(78)).__sizeof__()\n2256 结果没有问题，再来个复杂点的，对于包含 12345 个键值对的字典，占用多大内存呢？ >>> import math\n>>> math.log2(12345 * 3 / 2)\n14.1766017167513\n>>> 2 ** 15\n32768 计算结果表明，对于包含 12345 个键值对的字典，哈希表的长度至少为 2 的 14.17... 次方，而实际的长度显然是 2 的 15 次方，那么大小就出来了。另外注意：因为长度超过了 255，所以哈希索引数组中的一个元素占两字节。 >>> 48 + 40 + 32768 * 2 + 32768 * 2 // 3 * 24\n589904\n>>> dict.fromkeys(range(12345)).__sizeof__()\n589904 结果和我们分析的一样，以上我们就计算出了字典的内存大小，你也可以自己创建个字典测试一下。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的内存大小","id":"175","title":"字典的内存大小"},"176":{"body":"通过研究字典的具体实现，我们可以得出以下结论： 字典是一种高效的映射型容器，能够以 O(1) 的时间复杂度执行查询和写入操作； 字典之所以这么快，是因为它由哈希表实现。但快是要付出代价的，哈希表必须保证一定的稀疏性，否则会频繁出现索引冲突，导致哈希表性能下降，因为索引映射是随机的； 既然哈希表要保证稀疏性，就意味着内存开销大，因为存在内存浪费。 但 Python 为优化内存使用，选择基于两个数组来实现哈希表，通过避免键值对数组的浪费，来减少内存占用； 键值对数组里的 entry 除了保存 key 和 value 之外，还保存了 key 的哈希值。 以上就是字典的底层实现，但是还没有结束，哈希表的背后还隐藏了很多细节，我们就下一篇文章再聊吧。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 小结","id":"176","title":"小结"},"177":{"body":"通过研究字典的底层实现，我们找到了字典快速且高效的秘密，就是哈希表。而提到哈希表，必然绕不开哈希值，因为它决定了映射之后的索引。 如果想计算对象的哈希值，那么要保证对象必须是可哈希的。如果不可哈希，那么它就无法计算哈希值，自然也就无法作为字典的 key。那什么样的对象是可哈希的呢？ 因为哈希值不能发生改变，所以对象必须是不可变对象； 当对象的哈希值相等时，要判断对象是否相等，所以对象必须实现 __eq__ 方法； 所以如果对象满足不可变、并且实现了 __eq__ 方法，那么它就是可哈希的，只有这样的对象才能作为字典的 key 或者集合的元素。 像整数、浮点数、字符串等内置的不可变对象都是可哈希的，可以作为字典的 key。而像列表、字典等可变对象则不是可哈希的，它们不可以作为字典的 key。然后关于元组需要单独说明，如果元组里面的元素都是可哈希的，那么该元组也是可哈希的，反之则不是。 # 键是可哈希的就行，值是否可哈希则没有要求\nd = {1: 1, \"xxx\": [1, 2, 3], 3.14: 333} # 列表是可变对象，因此无法哈希\ntry: d = {[]: 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" # 元组也是可哈希的\nd = {(1, 2, 3): 123} # 但如果元组里面包含了不可哈希的对象\n# 那么整体也会变成不可哈希对象\ntry: d = {(1, 2, 3, []): 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" 而我们自定义类的实例对象也是可哈希的，并且哈希值是通过对象的地址计算得到的。 class Some: pass s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n8744065697364 8744065697355\n\"\"\" 当然 Python 也支持我们重写哈希函数，比如： class Some: def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n123 123\n\"\"\"\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x0000029C0ED045E0>: 1, <__main__.Some object at 0x0000029C5E116F20>: 2}\n\"\"\" 因为哈希值一样，映射出来的索引自然也是相同的，所以在作为字典的 key 时，会发生冲突。由于类的实例对象之间默认不相等，因此会改变规则重新映射，找一个可以写入的位置。 如果两个对象相等，它们的哈希值一定也相等。 注意：我们自定义类的实例对象默认都是可哈希的，但如果类里面重写了 __eq__，并且没有重写 __hash__ 的话，那么这个类的实例对象就不可哈希了。 class Some: def __eq__(self, other): return True try: hash(Some())\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'Some' \"\"\" 为什么会有这种现象呢？首先上面说了，在没有重写 __hash__ 方法的时候，哈希值默认是根据对象的地址计算得到的。而且对象如果相等，那么哈希值一定是一样的，并且不可变。 但我们重写了 __eq__，相当于控制了 == 操作符的比较结果，两个对象是否相等就由我们来控制了，可哈希值却还是根据地址计算得到的。因为两个对象地址不同，所以哈希值不同，但是对象却可以相等、又可以不相等，这就导致了矛盾。所以在重写了 __eq__、但是没有重写 __hash__ 的情况下，其实例对象便不可哈希了。 但如果重写了 __hash__，那么哈希值就不再通过地址计算了，因此此时是可以哈希的。 class Some: def __eq__(self, other): return True def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x00000202D7D945E0>: 2}\n\"\"\" 我们看到字典里面只有一个元素，因为重写了 __hash__ 方法之后，计算得到的哈希值都是一样的。如果没有重写 __eq__，实例对象之间默认是不相等的，因此哈希值一样，但是对象不相等，那么会重新映射。但我们重写了 __eq__，返回的结果是 True，所以 Python 认为对象是相等的，那么由于 key 的不重复性，只会保留一个键值对。 但需要注意的是，在比较相等时，会先比较地址是否一样，如果地址一样，那么哈希表会直接认为相等。 class Some: def __eq__(self, other): return False def __hash__(self): return 123 def __repr__(self): return \"Some Instance\" s1 = Some()\n# 我们看到 s1 == s1 为 False\nprint(s1 == s1)\n\"\"\"\nFalse\n\"\"\"\n# 但是只保留了一个 key，咦，两个 key 不相等，难道不应该重新映射吗？\n# 原因就是刚才说的，在比较是否相等之前，会先判断地址是否一样\n# 如果地址一样，那么认为是同一个 key，直接判定相等\nprint({s1: 1, s1: 2})\n\"\"\"\n{Some Instance: 2}\n\"\"\" s2 = Some()\n# 此时会保留两个 key，因为 s1 和 s2 地址不同，s1 == s2 也为 False\n# 所以哈希表认为这是两个不同的 key\n# 但由于哈希值一样，那么映射出来的索引也一样\n# 因此写入 s2: 2 时相当于发生了索引冲突，于是会重新映射\n# 但总之这两个 key 都会被保留\nprint({s1: 1, s2: 2}) \"\"\"\n{Some Instance: 1, Some Instance: 2}\n\"\"\" 同样的，我们再来看一个 Python 字典的例子。 d = {1: 123} d[1.0] = 234\nprint(d) # {1: 234} d[True] = 345\nprint(d) # {1: 345} 天哪噜，这是咋回事？首先整数在计算哈希值的时候，得到的结果就是其本身；而浮点数显然不是，但如果浮点数的小数点后面是 0，那么它和整数是等价的。 因此 1 和 1.0 的哈希值一样，并且两者也是相等的，因此它们被视为同一个 key，所以相当于是更新。同理 True 也一样，因为 bool 继承自 int，所以它等价于 1，比如：9 + True = 10。因此 True 和 1 相等，并且哈希值也相等，那么索引 d[True] = 345 同样相当于更新。 但是问题来了，值更新了我们可以理解，字典里面只有一个元素也可以理解，可为什么 key 一直是 1 呢？理论上最终结果应该是 True 才对啊。其实这算是 Python 偷了个懒吧（开个玩笑），因为 key 的哈希值是一样的，并且也相等，所以只会更新 value，而不会修改 key。 为了加深理解，我们再举个例子： d = {\"高老师\": 666} class A: def __hash__(self): return hash(\"高老师\") def __eq__(self, other): return True # A() == \"高老师\" 为 True，两者哈希值也一样\n# 所以相当于对 key 进行更新\nd[A()] = 777\nprint(d) # {'高老师': 777} print(d[\"高老师\"]) # 777\nprint(d[A()]) # 777 只要两个对象相等，并且哈希值相等，那么对于哈希表来说，它们就是同一个 key。 另外我们反复在提哈希值，而哈希值是通过哈希函数运算得到的，一个理想的哈希函数要保证哈希值尽量均匀地分布于整个哈希空间中，越是相近的值，其哈希值差别应该越大。还是那句话，哈希函数对哈希表的好坏起着至关重要的作用。 以上我们就详细地聊了聊对象的哈希值，如果对象可以计算哈希值，那么它一定实现了 __hash__ 方法，而内置的不可变对象都实现了。另外内置的哈希函数 hash，本质上也是调用了 __hash__。 print(hash(\"hello\"))\nprint(\"hello\".__hash__())\n\"\"\"\n-7465190714692855315\n-7465190714692855315\n\"\"\" 下一篇文章来聊一聊索引冲突是怎么解决的？ 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"41. 什么是可哈希对象，它的哈希值是怎么计算的？","id":"177","title":"41. 什么是可哈希对象，它的哈希值是怎么计算的？"},"178":{"body":"两个对象的哈希值相等，那么映射出的索引肯定相同。而如果哈希值不相等，映射出的索引也有可能相同，因为与哈希值空间相比，哈希表的槽位是非常有限的。如果不同的对象在经过映射之后，生成的索引相同，或者说它们被映射到了同一个槽，那么便发生了索引冲突。 解决索引冲突的常用方法有两种：分离链接法和开放寻址法。 分离链接法比较简单，如果有多个键值对映射到同一槽位，那么就用链表将它们串起来。然后是开放寻址法，这也是 Python 使用的方法，我们详细介绍一下。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 楔子","id":"178","title":"楔子"},"179":{"body":"首先将 key 映射成索引，但如果发现该索引对应的哈希槽被占了，那么就尝试另一个。 new_key 被映射到了索引为 5 的槽，但是该槽已经存储了键值对数组的索引，即该槽被占了。如果是分离链接法，那么会使用链表将两个 entry 串起来，但开放寻址法则是选择一个新的槽，也就是重新找个坑。 那么问题来了，新的槽要怎么找呢？一般来说，会在首槽的基础上增加一个偏移量，得到新的槽，如果还冲突，那么继续增加偏移量，直到找到一个可用的槽。总的来说就是一个不断探测的过程，每一次探测都会尝试增加偏移量。 所以新的问题又产生了，每次增加的偏移量是多少呢？其实这个问题取决于具体实现，如果偏移量是线性增加的，我们称之为线性探测；如果偏移量是平方增加的，我们称之为平方探测。 但不管是线性探测，还是平方探测，其实都不够好。因为偏移量始终是以一种固定的模式增加，这就导致映射到同一槽位的两个 key 的探测序列是相同的。 比如这里的 key1 和 key2，它们的哈希值不同，但都映射到了索引为 2 的槽，这是完全正常的，因为哈希表的槽位有限。而由于偏移量的增加方式是固定的，比如这里每次都增加 2，再加上首槽相同，因此它们的探测序列也相同，显然这会导致后续出现多次冲突。 所以 Python 对此进行了优化，探测函数在发现索引冲突时，不会简单地增加一个偏移量，而是会参考对象的哈希值，计算下一个候选位置，这就大大降低了冲突的可能性。 Python 的这种做法被称为迭代探测，当然迭代探测也属于开放寻址法的一种。所以当出现索引冲突时，Python 并不是简简单单地加上一个偏移量，而是使用专门设计的探测函数进行二次探查，也就是之前说的改变规则、重新映射，然后在函数内部会参考对象的哈希值来计算出一个新的索引。 在 dictobject.c 文件开头有着大量的注释，对字典进行了全局性的概括，当然具体细节我们都会详细说明。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 开放寻址法","id":"179","title":"开放寻址法"},"18":{"body":"PyObject 的 ob_type 字段的类型是 PyTypeObject *，所以类型对象由 PyTypeObject 结构体负责实现，看一看它长什么样子。 // Include/cpython/object.h typedef struct _typeobject { PyObject_VAR_HEAD const char *tp_name; Py_ssize_t tp_basicsize, tp_itemsize; destructor tp_dealloc; Py_ssize_t tp_vectorcall_offset; getattrfunc tp_getattr; setattrfunc tp_setattr; PyAsyncMethods *tp_as_async; reprfunc tp_repr; PyNumberMethods *tp_as_number; PySequenceMethods *tp_as_sequence; PyMappingMethods *tp_as_mapping; hashfunc tp_hash; ternaryfunc tp_call; reprfunc tp_str; getattrofunc tp_getattro; setattrofunc tp_setattro; PyBufferProcs *tp_as_buffer; unsigned long tp_flags; const char *tp_doc; traverseproc tp_traverse; inquiry tp_clear; richcmpfunc tp_richcompare; Py_ssize_t tp_weaklistoffset; getiterfunc tp_iter; iternextfunc tp_iternext; struct PyMethodDef *tp_methods; struct PyMemberDef *tp_members; struct PyGetSetDef *tp_getset; struct _typeobject *tp_base; PyObject *tp_dict; descrgetfunc tp_descr_get; descrsetfunc tp_descr_set; Py_ssize_t tp_dictoffset; initproc tp_init; allocfunc tp_alloc; newfunc tp_new; freefunc tp_free; inquiry tp_is_gc; PyObject *tp_bases; PyObject *tp_mro; PyObject *tp_cache; PyObject *tp_subclasses; PyObject *tp_weaklist; destructor tp_del; unsigned int tp_version_tag; destructor tp_finalize; vectorcallfunc tp_vectorcall; Py_DEPRECATED(3.8) int (*tp_print)(PyObject *, FILE *, int); #ifdef COUNT_ALLOCS Py_ssize_t tp_allocs; Py_ssize_t tp_frees; Py_ssize_t tp_maxalloc; struct _typeobject *tp_prev; struct _typeobject *tp_next;\n#endif\n} PyTypeObject; 类型对象在底层对应的是 struct _typeobject，或者说 PyTypeObject，它保存了实例对象的元信息。 所以不难发现，无论是 int、str、dict 等内置类型，还是使用 class 关键字自定义的类型，它们在 C 的层面都是由 PyTypeObject 这个结构体实例化得到的，只不过内部字段的值不同，PyTypeObject 结构体在实例化之后得到的类型对象也不同。 然后我们来看看 PyTypeObject 里面的字段都代表啥含义，字段还是比较多的，我们逐一介绍。 PyObject_VAR_HEAD 宏，会被替换为 PyVarObject，所以类型对象是一个变长对象。因此类型对象也有引用计数和类型，这与我们前面分析的是一致的。 tp_name 对应 Python 中类型对象的 __name__ 属性，即类型对象的名称。 # 类型对象在底层对应的是 PyTypeObject 结构体实例\n# 它的 tp_name 字段表示类型对象的名称\nprint(int.__name__) # int\n# 动态创建一个类\nA = type(\"我是 A\", (object,), {})\nprint(A.__name__) # 我是 A 所以任何一个类型对象都有 __name__ 属性，也就是都有名称。 tp_basicsize，tp_itemsize tp_basicsize：表示创建实例对象所需的基本内存大小； tp_itemsize：如果对象是变长对象，并且元素保存在对应的结构体内部，比如元组，那么 tp_itemsize 表示内部每个元素的内存大小。如果是定长对象，或者虽然是变长对象，但结构体本身不保存数据，而是只保存了一个指针，那么 tp_itemsize 为 0； tp_dealloc 析构函数，对应 Python 中类型对象的 __del__，会在实例对象被销毁时执行。 tp_vectorcall_offset 如果想调用一个对象，那么它的类型对象要定义 __call__ 函数。 class A: def __call__(self, *args, **kwargs): return \"被调用了\" a = A()\n# 如果调用 a，那么 type(a) 要定义 __call__ 函数\nprint(a())\n\"\"\"\n被调用了\n\"\"\"\n# 底层会转成如下逻辑\nprint(A.__call__(a))\n\"\"\"\n被调用了\n\"\"\" # 函数也是一个实例对象，它能被调用\n# 说明 type(函数) 也一定实现了 __call__\ndef some_func(name, age): return f\"name: {name}, age: {age}\"\n# 函数的类型是 function\nprint(type(some_func))\n\"\"\"\n<class 'function'>\n\"\"\"\n# 调用函数\nprint(some_func(\"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\"\n# 也可以这么做\nprint(type(some_func).__call__(some_func, \"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\" 以上就是对象最通用的调用逻辑，但通用也意味着平庸，这种调用方式的性能是不高的。自定义类的实例对象还好，因为需要支持调用的场景不多，而函数则不同，尽管它也是实例对象，但它生下来就是要被调用的。如果函数调用也走通用逻辑的话，那么效率不高，因此 Python 从 3.8 开始引入了 vectorcall 协议，即矢量调用协议，用于优化和加速函数调用。相比常规调用，矢量调用具备如下优势： 避免创建临时元组来传递参数 减少参数打包/解包的开销 支持关键字参数的快速处理 总之当一个对象被调用时，如果它支持 vectorcall 协议，那么会通过 tp_vectorcall_offset 找到实现矢量调用的函数指针。 注意：vectorcall 函数指针定义在实例对象中，而 tp_vectorcall_offset 字段维护了 vectorcall 函数指针在实例对象中的偏移量，该偏移量用于定位到一个特定的函数指针，这个函数指针符合 vectorcall 协议。 如果类型对象的 tp_vectorcall_offset 为 0，表示其实例对象不支持矢量调用，因此会退化为常规调用，即通过类型对象的 __call__ 进行调用。 tp_getattr，tp_setattr 对应 Python 中类型对象的 __getattr__ 和 __setattr__，用于操作实例对象的属性。但这两个字段已经不推荐使用了，因为它要求在操作属性时，属性名必须为 C 字符串，以及不支持通过描述符协议处理属性。 所以这两个字段主要用于兼容旧版本，现在应该使用 tp_getattro 和 tp_setattro。 tp_as_number、tp_as_sequence、tp_as_mapping、tp_as_async tp_as_number：实例对象为数值时，所支持的操作。这是一个结构体指针，指向的结构体中的每一个字段都是一个函数指针，指向的函数就是对象可以执行的操作，比如四则运算、左移、右移、取模等等。 tp_as_sequence：实例对象为序列时，所支持的操作，也是一个结构体指针。 tp_as_mapping：实例对象为映射时，所支持的操作，也是一个结构体指针。 tp_as_async：实例对象为协程时，所支持的操作，也是一个结构体指针。 tp_repr、tp_str 对应 Python 中类型对象的 __repr__ 和 __str__，用于控制实例对象的打印输出。 tp_hash 对应 Python 中类型对象的 __hash__，用于定义实例对象的哈希值。 tp_call 对应 Python 中类型对象的 __call__，用于控制实例对象的调用行为。当然这属于常规调用，而对象不仅可以支持常规调用，还可以支持上面提到的矢量调用（通过减少参数传递的开销，提升调用性能）。 但要注意的是，不管使用哪种调用协议，对象调用的行为必须都是相同的。因此一个对象如果支持矢量调用，那么它也必须支持常规调用，换句话说对象如果实现了 vectorcall，那么它的类型对象也必须实现 tp_call。 如果你在实现 vectorcall 之后发现它比 tp_call 还慢，那么你就不应该实现 vectorcall，因为实现 vectorcall 是有条件的，当条件不满足时性能反而会变差。 tp_getattro，tp_setattro 对应 Python 中类型对象的 __getattr__ 和 __setattr__。 tp_as_buffer 指向 PyBufferProcs 类型的结构体，用于共享内存。通过暴露出一个缓冲区，可以和其它对象共享同一份数据，因此当类型对象实现了 tp_as_buffer，我们也说其实例对象实现了缓冲区协议，举个例子。 import numpy as np buf = bytearray(b\"abc\")\n# 和 buf 共享内存\narr = np.frombuffer(buf, dtype=\"uint8\")\nprint(arr) # [97 98 99]\n# 修改 buf\nbuf[0] = 255\n# 会发现 arr 也改变了，因为它和 buf 共用一块内存\nprint(arr) # [255 98 99] 所以 tp_as_buffer 主要用于那些自身包含大量数据，且需要允许其它对象直接访问的类型。通过实现缓冲区协议，其它对象可以直接共享数据，而无需事先拷贝，这在处理大型数据或进行高性能计算时非常有用。 关于缓冲区协议，后续还会详细介绍。 tp_flags 对应 Python 中类型对象的 __flags__，负责提供类型对象本身的附加信息，通过和指定的一系列标志位进行按位与运算，即可判断该类型是否具有某个特征。 那么标志位都有哪些呢？我们介绍几个常见的。 // Include/object.h // 类型对象的内存是否是动态分配的\n// 像内置的类型对象属于静态类，它们不是动态分配的\n#define Py_TPFLAGS_HEAPTYPE (1UL << 9)\n// 类型对象是否允许被继承\n#define Py_TPFLAGS_BASETYPE (1UL << 10)\n// 类型对象的实例对象是否参与垃圾回收\n#define Py_TPFLAGS_HAVE_GC (1UL << 14)\n// 类型对象是否是抽象基类\n#define Py_TPFLAGS_IS_ABSTRACT (1UL << 20) 我们通过 Python 来演示一下。 # 是否是自定义的动态类\nPy_TPFLAGS_HEAPTYPE = 1 << 9\nclass A: pass\n# 如果与运算的结果为真，则表示是动态类，否则不是\nprint(A.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n512\n\"\"\"\nprint(int.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n0\n\"\"\" # 类型对象是否允许被继承\nPy_TPFLAGS_BASETYPE = 1 << 10\n# object 显然允许被继承，因此与运算的结果为真\nprint(object.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n1024\n\"\"\"\n# 但 memoryview 就不允许被继承\ntry: class B(memoryview): pass\nexcept TypeError as e: print(e) \"\"\" type 'memoryview' is not an acceptable base type \"\"\"\nprint(memoryview.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n0\n\"\"\" # 类型对象的实例对象是否参与垃圾回收\nPy_TPFLAGS_HAVE_GC = 1 << 14\n# int 的实例对象（整数）不会产生循环引用，所以不会参与垃圾回收\nprint(int.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n0\n\"\"\"\n# 但列表是会参与垃圾回收的\nprint(list.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n16384\n\"\"\" # 类型对象是否是抽象基类\nPy_TPFLAGS_IS_ABSTRACT = 1 << 20\nfrom abc import ABCMeta, abstractmethod\n# 显然 C 不是抽象基类，而 D 是\nclass C: pass\nclass D(metaclass=ABCMeta): @abstractmethod def foo(self): pass\nprint(C.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n0\n\"\"\"\nprint(D.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n1048576\n\"\"\" 所以这就是 tp_flags 的作用，它负责描述一个类型对象都具有哪些额外特征。 tp_doc 对应 Python 中类型对象的 __doc__。 class People: \"\"\"以前我没得选\"\"\" print(People.__doc__)\n\"\"\"\n以前我没得选\n\"\"\" 这个比较简单。 tp_traverse，tp_clear 这两个字段是一对，负责参与垃圾回收机制。 tp_traverse：用于标记阶段，通过遍历实例对象所引用的其它对象，确定对象之间的引用关系，帮助垃圾回收器识别出所有活跃的对象和出现循环引用的对象。 tp_clear：用于清除阶段，负责减少出现循环引用的对象的引用计数。 tp_richcompare 负责实现对象的比较逻辑，包含 >、>=、<、<=、!=、==。 tp_weaklistoffset 实例对象的弱引用列表在实例对象中的偏移量，如果 tp_weaklistoffset 为 0，则表示实例对象不支持弱引用。 tp_iter、tp_iternext 对应 Python 中类型对象的 __iter__ 和 __next__。 tp_methods 负责保存类型对象里的成员函数，我们以 list 为例。 tp_members 负责指定可以绑定在实例对象上的属性，我们使用 class 关键字定义动态类的时候，会在 __init__ 函数中给实例对象绑定属性，而对于底层 C 来说，需要通过 tp_members 字段。 以 slice 为例，它负责创建一个切片。 lst = list(range(10))\nprint(lst[1: 7: 2]) # [1, 3, 5]\n# 等价于\nprint(lst[slice(1, 7, 2)]) # [1, 3, 5] slice 是一个底层实现好的静态类，接收 start、end、step 三个参数，所以它底层的 tp_members 就是这么定义的。 对于静态类而言，可以给 self 绑定哪些属性、以及类型是什么，都已经事先在 tp_members 里面写死了，后续不可以新增或删除属性。 s = slice(1, 7, 2)\n# 静态类的实例对象不可以新增或删除属性\ntry: s.xx = \"xx\"\nexcept AttributeError as e: print(e) \"\"\" 'slice' object has no attribute 'xx' \"\"\" # 至于能否修改，则看定义属性时是否要求属性是 READONLY\n# 对于 slice 来说，它的三个属性都是 READONLY，所以不能修改\ntry: s.start = 2\nexcept AttributeError as e: print(e) \"\"\" readonly attribute \"\"\" 但使用 class 自定义的动态类而言，新增、删除、修改属性都是可以的，至于里面的更多细节，后续在介绍类的时候会详细剖析。 tp_getset 指向一个 PyGetSetDef 结构体数组，里面的每个结构体都定义了一个属性的名称、获取该属性的函数、设置该属性的函数、属性的文档字符串。 name：属性的名称，Python 代码可以通过该名称来访问属性。 get：属性的 getter 函数，如果设置了这个函数，Python 代码读取属性时会调用它。 set：属性的 setter 函数，如果设置了这个函数，Python 代码修改属性时会调用它。 doc：属性的文档字符串，为属性提供描述信息。 closure：一个 void * 指针，用于传递额外的信息给 getter 和 setter，不常用。 所以我们发现 tp_getset 的作用不就类似于 @property 装饰器吗？tp_getset 数组里面的每个结构体负责实现一个 property 属性。 tp_base 对应 Python 中类型对象的 __base__，返回继承的第一个父类。 tp_dict 对应 Python 中类型对象的 __dict__，即属性字典。 tp_descr_get、tp_descr_set 对应 Python 中类型对象的 __get__ 和 __set__，用于实现描述符。 tp_dictoffset 注意它和 tp_dict 的区别，tp_dict 表示类型对象的属性字典，而 tp_dictoffset 表示实例对象的属性字典在实例对象中的偏移量。 tp_init 对应 Python 中类型对象的 __init__，用于实例对象属性的初始化。 tp_alloc 负责为实例对象申请内存，申请多大呢？取决于 tb_basicsize 和 tp_itemsize。 tp_new 对应 Python 中类型对象的 __new__，即构造函数，在 tp_new 内部会调用 tp_alloc 为实例对象申请内存。 tp_free 内存释放函数，负责释放实例对象所占的内存，注意它和 tp_dealloc 的区别与联系。tp_dealloc 表示析构函数，当对象的引用计数降到零的时候执行，内部会负责如下工作。 减少引用的其它对象的引用计数； 释放对象拥有的资源，比如文件句柄或网络连接； 调用内存释放函数来释放对象本身占用的内存，这一步由 tp_free 来完成。 所以要注意这几个字段之间的区别，我们再总结一下。 tp_is_gc 指示该类型对象的实例对象是否参与垃圾回收。 // Objects/typeobject.c\nunsigned long\nPyType_GetFlags(PyTypeObject *type)\n{ return type->tp_flags;\n} // Include/object.h\n#define PyType_HasFeature(t,f) ((PyType_GetFlags(t) & (f)) != 0) // Include/objimpl.h\n// 显然只需判断 tp_flags & Py_TPFLAGS_HAVE_GC 是否不等于 0 即可\n#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC) 如果参与垃圾回收，那么 tp_flags & Py_TPFLAGS_HAVE_GC 的结果不等于 0。 tp_bases 对应 Python 中类型对象的 __bases__，返回一个元组，里面包含直接继承的所有父类。 tp_mro 对应 Python 中类型对象的 __mro__，返回一个元组，里面包含自身以及直接继承和间接继承的所有父类，直到 object。 注意：返回的元组中的类是有顺序关系的，它基于 C3 线性算法生成，定义了方法解析的顺序。当 Python 需要查找方法或属性时，将按照此顺序进行搜索。 tp_cache 该字段已废弃，这里不做介绍。 tp_subclasses 等价于 Python 中类型对象的 __subclasses__，会返回继承该类的所有子类。 class A: pass class B(A): pass class C(B): pass print(A.__subclasses__())\n\"\"\"\n[<class '__main__.B'>]\n\"\"\" 但是只返回直接继承的子类，间接继承的不返回，比如这里只返回了 B，而 C 没有返回。 tp_weaklist 类型对象的弱引用列表，注意它和前面提到的 tp_weaklistoffset 的区别。tp_weaklist 表示类型对象的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表在实例对象中的偏移量。 tp_del 和 tp_dealloc 作用相同，但 tp_del 主要是兼容以前的旧版本，现在直接使用 tp_dealloc 即可。 tp_version_tag 用于标记类型对象的版本，每当类型的定义发生变化时（例如添加、删除或修改成员函数），版本标签就会更新。解释器会使用这个版本标签来确定方法缓存是否有效，从而避免每次调用方法时都重新解析和查找。 tp_finalize 负责在对象被销毁之前执行相应的清理操作，确保资源得到妥善处理，它的调用时机在对象的引用计数达到零之后、tp_dealloc（析构函数）被调用之前。 该字段不常用，一般只出现在生成器和协程当中。然后 tp_dealloc、tp_del、tp_finalize 三个字段的类型是一致的，都是 destructor 类型，那么它们三者有什么区别呢？ tp_dealloc：在所有的类型对象中都需要指定，因为它是管理实例对象生命周期的关键，它负责减少引用的其它对象的引用计数，以及调用 tp_free 释放当前对象占用的内存，当然也可以执行必要的清理操作。 tp_finalize：负责在对象的生命周期结束前执行相关清理操作，一般只用于生成器和协程当中，此时会和 tp_dealloc 搭配使用。 tp_del：除非是兼容遗留代码，否则应避免使用 tp_del，而是依赖于更现代的垃圾回收和清理机制，即使用 tp_dealloc。 tp_vectorcall 前面说了，实例对象在调用时，可以走类型对象的 tp_call，但这样效率不高。为此 Python 引入了矢量调用，实现矢量调用的函数指针定义在实例对象内部，偏移量则由类型对象的 tp_vectorcall_offset 字段维护。 如果实例对象支持矢量调用，那么会通过类型对象的 tp_vectorcall_offset 定位到对应的 vectorcall 函数指针，进行调用。否则执行类型对象的 tp_call。 那么问题来了，既然实例对象可以支持矢量调用，那么类型对象当然也可以支持。而类型对象的矢量调用函数，便由 tp_vectorcall 字段指定。 所以 tp_vectorcall 和 tp_vectorcall_offset 之间的关系，就类似于 tp_dict 和 tp_dictoffset 之间的关系。 tp_dict 表示类型对象自身的属性字典，tp_dictoffset 表示实例对象的属性字典相对于实例对象首地址的偏移量。 tp_vectorcall 表示类型对象自身的矢量调用函数，tp_vectorcall_offset 表示实例对象的矢量调用函数相对于实例对象首地址的偏移量。 tp_weaklist 表示类型对象自身的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表相对于实例对象首地址的偏移量。 offset 机制允许实例对象拥有更加弹性的内存布局。 另外如果类型对象的 tp_vectorcall 字段为空，则表示类型对象不支持矢量调用，那么它在调用时会走元类的 tp_call。所以我们说 class 具有二象性，而这种平行的设计使得 Python 能够统一处理类型对象和实例对象的属性访问和调用行为。 以上就是 PyTypeObject 的各个字段的含义。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 解密 PyTypeObject","id":"18","title":"解密 PyTypeObject"},"180":{"body":"当存储键值对时，要将 key 映射成索引，这个索引就是哈希索引数组的索引。至于具体的映射过程由探测函数负责，即 PyDictKeysObject 结构体内部的 dk_lookup 字段。 Python 为哈希表搜索提供了多种探测函数： lookdict_unicode：专门针对 key 为字符串的 entry。 lookdict_index：专门针对 key 为整数的 entry。 lookdict：通用逻辑，可以把 lookdict_unicode、lookdict_index 看成 lookdict 的特殊实现，只不过 key 是整数和字符串的场景非常常见，因此为其单独实现了一个函数。 我们这里重点看一下 lookdict 的函数实现，不过在介绍之前，先来看几个宏。 // Objects/dictobject.c // 获取哈希表的长度，或者说哈希索引数组的长度\n#define DK_SIZE(dk) ((dk)->dk_size) // 哈希表的长度减 1，将 key 的哈希值和它按位与，便可将 key 映射成索引\n// 因为 dk_size 满足 2 的 n 次方，所以 hash % dk_size 等价于 hash & (dk_size - 1)\n#define DK_MASK(dk) (((dk)->dk_size)-1) // 获取哈希索引数组中每个元素的大小，数组的长度不同，每个元素的大小不同\n// dk_size <= 255，每个元素 1 字节\n// 256 <= dk_size <= 65535，每个元素 2 字节\n// 65536 <= dk_size <= 4294967295，每个元素 4 字节\n// dk_size >= 4294967296，每个元素 8 字节\n// 由于字典的键值对个数基本不会超过 4294967295，所以我们认为元素的大小就是 1、2 或者 4 字节\n#define DK_IXSIZE(dk) \\ (DK_SIZE(dk) <= 0xff ? \\ 1 : DK_SIZE(dk) <= 0xffff ? \\ 2 : DK_SIZE(dk) <= 0xffffffff ? \\ 4 : sizeof(int64_t)) // 获取紧跟在 PyDictKeysObject 结构体后面的键值对数组\n// 这个和前面介绍字符串时，获取 PyASCIIObject 结构体后面的字符数组是类似的\n// 主要是利用 C 语言指针的技巧（甚至都不能算技巧），这里再来详细介绍一下\n// 假设有一个 int *a，那么 a + 3 和 a[3] 是等价的，都会向后偏移 3 个 int，即 12 字节\n// 那么问题来了，对于任意类型的指针 T *p，如果想向后偏移 n 个字节，该怎么做呢？\n// 很简单，将 p 加上 n / sizeof(T) 即可，但问题是 n / sizeof(T) 不一定是个整数啊\n// 因此我们可以将指针转成 int8_t *，然后再加上 n，这样就会偏移 sizeof(int8_t) * n 个字节，即 n 个字节\n// 比如 ((int8_t *)p) + n 或者 ((int8_t *)p)[n]\n// 然后再来看 DK_ENTRIES 这个宏的逻辑，由于键值对数组紧跟在哈希索引数组后面\n// 所以通过 (dk)->dk_indices 获取哈希索引数组，然后转成 int8_t * 类型\n// 而 DK_SIZE(dk) * DK_IXSIZE(dk) 显然是哈希索引数组所占的内存大小\n// 然后让 (int8_t*)((dk)->dk_indices) 向后偏移这些字节，不就定位到键值对数组的首元素了吗\n#define DK_ENTRIES(dk) \\ ((PyDictKeyEntry*)(&((int8_t*)((dk)->dk_indices))[DK_SIZE(dk) * DK_IXSIZE(dk)])) // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 以上就是常用的几个宏，然后来看探测函数 lookdict 的逻辑。 // Objects/dictobject.c #define PERTURB_SHIFT 5 // 基于哈希索引数组的索引，获取指定的哈希槽里面存储的键值对数组的索引\nstatic inline Py_ssize_t\ndictkeys_get_index(PyDictKeysObject *keys, Py_ssize_t i)\n{ // 哈希表的长度 Py_ssize_t s = DK_SIZE(keys); // 键值对数组的索引 Py_ssize_t ix; // 如果哈希表的长度小于 1 << 8，哈希索引数组的每个元素占 1 字节 if (s <= 0xff) { int8_t *indices = (int8_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度小于 1 << 16，哈希索引数组的每个元素占 2 字节 // 指针类型要转成 int16_t *，这样获取元素时会获取两个字节 else if (s <= 0xffff) { int16_t *indices = (int16_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度大于等于 1 << 32，哈希索引数组的每个元素占 8 字节（no way）\n#if SIZEOF_VOID_P > 4 else if (s > 0xffffffff) { int64_t *indices = (int64_t*)(keys->dk_indices); ix = indices[i]; }\n#endif // 否则哈希索引数组的每个元素占 4 字节 else { int32_t *indices = (int32_t*)(keys->dk_indices); ix = indices[i]; } assert(ix >= DKIX_DUMMY); // 返回键值对数组的索引 return ix;\n} // 探测函数\nstatic Py_ssize_t _Py_HOT_FUNCTION\nlookdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr)\n{ // 将 key 映射成索引，这个索引就是哈希索引数组的索引 /* 参数 mp：指向字典的指针 * 参数 key：指向键的指针 * 参数 hash：键的哈希值 * 参数 value_addr：值的二级指针 */ size_t i, mask, perturb; PyDictKeysObject *dk; PyDictKeyEntry *ep0; top: // 指向 PyDictKeysObject 对象 dk = mp->ma_keys; // 获取 PyDictKeysObject 内部的 dk_entries，即键值对数组 ep0 = DK_ENTRIES(dk); // 哈希表的长度减 1 mask = DK_MASK(dk); // perturb，初始值等于参数 hash，即 key 的哈希值 perturb = hash; // 将哈希值和 mask 按位与，计算出哈希索引数组的索引 i = (size_t)hash & mask; for (;;) { // 基于哈希索引数组的索引，从指定的哈希槽中获取键值对数组的索引 Py_ssize_t ix = dictkeys_get_index(dk, i); // 哈希索引数组里面的元素初始为 -1，如果 ix == -1 // 证明当前 key 映射出的哈希槽，还没有存储键值对数组的某个索引 // 这就意味着当前要查找的 key 不存在，此时直接返回 -1 即可 if (ix == DKIX_EMPTY) { *value_addr = NULL; return ix; } // 如果 ix >= 0，说明确实存储了一个合法的键值对数组的索引 if (ix >= 0) { // ep0 是键值对数组，基于索引 ix 获取里面的键值对 PyDictKeyEntry *ep = &ep0[ix]; assert(ep->me_key != NULL); // ep->me_key 和变量 key 都是指针 // 如果这两者相等，说明指向了同一个对象（字符串），显然查找的 key 已在字典中 if (ep->me_key == key) { // 该函数不光要返回索引，还要返回 value，但 C 是单返回值语言，怎么办呢？ // 只需要在调用函数时传个指针过来即可，会在函数内部进行修改 // 由于 Python 的变量、容器存储的元素本身就是指针，所以 value_addr 是个二级指针 *value_addr = ep->me_value; // 返回键值对数组的索引 return ix; } // 如果 ep->me_key != key，说明两者指向的不是同一个对象 // 那么就比较两个对象本身以及哈希值是否相等，如果相等，也表示 key 已存在 if (ep->me_hash == hash) { // 先保证哈希值相等 PyObject *startkey = ep->me_key; Py_INCREF(startkey); // cmp 大于 0 说明比较结果为真，等于 0 说明比较结果为假，小于 0 说明比较时出现错误 int cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) { *value_addr = NULL; return DKIX_ERROR; } // 可能有人觉得这里的 if 是不是有点多余，这肯定百分百成立啊 // 其实这一步主要是为了检测字典是否被修改（不用关注） if (dk == mp->ma_keys && ep->me_key == startkey) { // 如果 cmp > 0，说明两个对象相等，那么修改 *value_addr，返回 ix if (cmp > 0) { *value_addr = ep->me_value; return ix; } } else { // 字典如果被修改，那么重头来，这里不用关注 goto top; } } } // 走到这里说明 ix 是合法的，但是对应的 entry->me_key 和当前要查找的 key 不相等 // 显然出现了索引冲突，于是将哈希值右移 5 位 perturb >>= PERTURB_SHIFT; // 然后加上 i*5 + 1，并重新和 mask 按位与，得到新的哈希索引数组的索引 // 也就是之前说的，改变规则、重新映射 i = (i*5 + perturb + 1) & mask; } Py_UNREACHABLE();\n} 以上就是 lookdict 函数的逻辑，至于 lookdict_index 和 lookdict_unicode 与之是类似的。 我们将逻辑再描述一遍，首先 perturb 初始等于 key 的哈希值，mask 等于哈希表的长度减一，然后执行 perturb & mask 便可得到一个索引。这个过程就是我们说的索引映射，映射出的索引便是哈希索引数组的索引，然后该索引对应的哈希槽又存储了一个索引，这个索引是键值对数组的索引。 哈希索引数组里面的一个位置我们称之为一个槽，如果映射出来的索引对应的哈希槽中存储的键值对数组的索引小于 0，说明该 key 对应的键值对还没有被存储过，那么直接返回初始值 -1 即可。 如果存储的键值对数组的索引（源码中的 ix）大于等于 0，说明已经存储了一个键值对，它的 key 和查找的 key 映射出的索引是相同的。然后比较 key 是否相等，如果相等，说明已经找到了，那么直接返回 ix 即可。如果 key 不相等，说明出现索引冲突了，那么要改变策略，重新映射。 perturb >>= PERTURB_SHIFT;\ni = mask & (i*5 + perturb + 1); 变量 i 便是映射出的哈希索引数组的索引，但发生冲突了，于是将 perturb 右移 5 位，然后加上 perturb + i * 5 + 1，再和 mask 按位与计算出新的 i。至于为什么要选择这种做法，这是 Python 官方经过多次实践得出来的结论。 当 lookdict 执行完之后，外界就拿到了指定的 key 对应的键值对数组的索引，并且也能拿到 key 对应的 value（key 若不存在就是 NULL）。但是还没结束，我们看到 lookdict 返回的是变量 ix，而变量 i 才是我们需要的。 变量 i 表示槽的索引，变量 ix 表示该槽存储的键值对数组的索引。由于我们是要寻找指定的槽，那么返回的应该是槽的位置、也就是变量 i 才对啊，为啥要返回变量 ix 呢？别急，往下看。 #define DKIX_EMPTY (-1) 初始状态下，槽存储的都是 -1，表示当前槽是可用的。如果存储的索引大于等于 0，则表示该槽已经被占用了，当 key 不相等时会改变规则重新映射。总之最终的结果是： 如果 key 存在，那么返回的 ix 就是该 key 对应的键值对在键值对数组中的索引，此时 ix 大于等于 0； 如果 key 不存在，那么返回的 ix 就是哈希槽的初始值 -1。 所以 lookdict 函数只是告诉我们当前 key 在哈希表中是否存在，如果要获取槽的索引，即 lookdict 里面的变量 i，那么还需要另外两个函数。 find_empty_slot：如果 lookdict 返回的 ix 小于 0，说明 key 不存在，那么调用该函数返回槽的索引。 lookdict_index：如果 lookdict 返回的 ix 大于等于 0，说明 key 存在，那么调用该函数返回槽的索引。 所以这两个函数做的事情是一样的，都是返回槽的索引，我们看一下具体实现。 // Objects/dictobject.c static Py_ssize_t\nfind_empty_slot(PyDictKeysObject *keys, Py_hash_t hash)\n{ assert(keys != NULL); const size_t mask = DK_MASK(keys); // 获取槽的索引 i size_t i = hash & mask; // 获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(keys, i); // 不停映射，直到 ix 小于 0 // 因为调用该函数时已经说明 key 不存在了 // 所以最终一定会映射到一个空槽 for (size_t perturb = hash; ix >= 0;) { perturb >>= PERTURB_SHIFT; // 映射的逻辑是相同的 i = (i*5 + perturb + 1) & mask; ix = dictkeys_get_index(keys, i); } // 当 ix 小于 0 时，便找到了槽的索引 return i;\n} static Py_ssize_t\nlookdict_index(PyDictKeysObject *k, Py_hash_t hash, Py_ssize_t index)\n{ size_t mask = DK_MASK(k); size_t perturb = (size_t)hash; size_t i = (size_t)hash & mask; for (;;) { // 基于槽的索引 i，获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(k, i); // 参数 index 就是 lookdict 函数返回的 ix // 如果 ix 和 index 是相等的，说明此时的 i 就是要获取的槽的索引 if (ix == index) { return i; } if (ix == DKIX_EMPTY) { return DKIX_EMPTY; } // 整个映射逻辑都是一样的 // 因为在 lookdict 函数中只返回了 ix，即参数 index // 所以要按照相同的规则再映射一次，如果映射出的 ix 和 index 相等 // 那么我们就找到了槽的索引 i，并且索引为 i 的槽存储的就是 index perturb >>= PERTURB_SHIFT; i = mask & (i*5 + perturb + 1); } Py_UNREACHABLE();\n} 所以我们说的探测函数应该是 lookdict 和 find_empty_slot、lookdict_index 的组合。 lookdict 负责返回槽存储的索引，用于判断 key 是否存在。 find_empty_slot、lookdict_index 则负责返回槽的索引，即 key 最终被映射到了哪一个槽。 另外还有一点，我们之前说索引冲突时，会执行探测函数计算新的存储位置。其实不管有没有发生冲突，即使存储键值对的时候哈希表是空的，也要执行探测函数，毕竟探测函数的目的就是基于哈希值映射出一个合适的槽。如果探测函数执行的时候发现索引冲突了，也就是槽里的索引 ix >= 0，并且 key 还不相等，那么会改变规则重新映射。 因此在存储某个键值对时，无论索引冲突多少次，探测函数只会执行一次。在探测函数里面，会不断尝试解决冲突，直到映射出一个可用的槽。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 探测函数","id":"180","title":"探测函数"},"181":{"body":"以上就是索引映射的具体逻辑，以及出现冲突是怎么解决的。就是先用哈希函数计算出 key 的哈希值，然后作为参数传递到探测函数中。在探测函数里面，会将哈希值和 mask 按位与，得到索引。如果索引冲突了，那么会改变规则，这里的规则如下： // 将哈希值右移 PERTURB_SHIFT 个位\nperturb >>= PERTURB_SHIFT;\n// 然后将哈希值加上 i*5 + 1，这个 i 就是当前冲突的索引\n// 运算之后的结果再和 mask 按位与，得到一个新的 i\n// 然后判断变量 i 对应的槽是否可用，不可用则重复当前逻辑，直到出现一个可用的槽\ni = (i*5 + perturb + 1) & mask; 所以 Python 在索引冲突时，并不像线性探测和平方探测那样，简单地加一个固定的偏移量，而是参考对象的哈希值计算出一个新的索引。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 小结","id":"181","title":"小结"},"182":{"body":"通过前面的学习，我们知道哈希表这种数据结构的逻辑是先通过哈希函数计算出键（key）的哈希值，然后将哈希值传递到探测函数中，映射成一个索引，最终通过索引去访问连续的内存区域。而哈希表这种数据结构，最终目的就是加速键的搜索过程。 但索引会存在冲突，并且键值对数量越多，映射出的索引出现冲突的概率越高。而如果冲突了，就改变规则重新映射，这种做法叫做开放寻址法。当发生冲突时，在探测函数内部会参考哈希值以及冲突的索引，计算下一个候选位置，并判断是否可用。如果不可用，会继续重复此过程，直到找到一个可用的位置。 通过多次探测，会经过多个位置，我们认为这些位置就形成了一个冲突探测链（探测序列），下面举例说明。 为了描述方便，我们后续偶尔会用 dk_indices 表示哈希索引数组、用 dk_entries 表示键值对数组、用 entry 表示键值对（包含两个字段：me_key 和 me_value，分别表示键和值）。当然在源码中，它们也是这个名字。 key 映射之后的索引是哈希索引数组的索引，我们记作 i，该索引对应的哈希槽中又存储了一个索引（entry 在键值对数组中的索引），我们记作 ix。那么 ix = dk_indices[i]，对应的 entry = dk_entries[ix]。 比如插入一个 key 等于 \"satori\" 的键值对，它映射到了索引为 a 的槽，但是该槽已经被占用了，那么 dk_entries[dk_indices[a]] 便是使用该槽的 entry，但它的 key 不等于 \"satori\"，说明出现了索引冲突。于是重新映射，映射到索引为 b 的槽，发现依旧不行。那么只能再次映射，映射到索引为 c 的槽，发现该槽存储的索引是 -1，说明该槽还没有人用，于是将键值对追加到 dk_entries 中，并把它在 dk_entries 中的索引存在该槽中。 那么经过以上流程，a -> b -> c 便形成了一条冲突探测链，同理我们查找的时候也会按照这个顺序进行查找。 显然上面这些东西，现在理解起来已经没什么难度了，我们基于 key 获取 value 时也是这个过程。 当执行 d[\"satori\"] 时，肯定会先映射到索引为 a 的槽，但 dk_entries[dk_indices[a]].me_key 不等于字符串 \"satori\"，于是重新映射。然后映射到索引为 b 的槽，发现还不相等，再映射到索引为 c 的槽，发现对应的键值对的 key 等于 \"satori\"，于是就把值取出来了。 显然以上符合我们的预期，但是，我要说但是了。如果我们把索引为 b 的槽对应的 entry 删掉呢？那么老规矩，映射成索引，先走到索引为 a 的槽，但是发现坑被占，于是又走到索引为 b 的槽，结果发现居然没有 entry，那么直接就报出了一个 KeyError。 所以继续寻找的前提是，哈希槽一定存储了某个 entry 在键值对数组中的索引，并且该 entry 的 key 和指定的 key 不相等。但如果发现没有 entry，直接 KeyError。 然而 \"satori\" 这个 key 确实是存在的，因此这种情况我们称之为探测链断裂。本来应该走到位置 c 的，但是由于位置 b 没有对应 entry，导致探测函数在位置 b 就停止了。 因此我们发现，当一个 entry 只要位于任何一条探测链当中，在删除时都不能执行真正意义上的删除，而是要进行伪删除。那什么是伪删除呢？别着急，先往下看。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表能直接删除元素吗","id":"182","title":"哈希表能直接删除元素吗"},"183":{"body":"哈希槽有以下几种状态： Unused； Active； Dummy； 来解释一下它们的含义。 // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 上面几个宏非常重要，当然主要是前两个宏。 Unused 态 如果没有 key 映射到指定的哈希槽，那么该哈希槽存储的索引就是 -1，即 DKIX_EMPTY，表示该槽尚未被使用，那么状态便是 Unused 态。比如一个刚初始化的哈希表，它的哈希索引数组存储的便都是 -1。 Active 态 如果某个 key 映射到了指定的哈希槽，那么该槽便会存储对应 entry 在键值对数组中的索引，这个索引一定是大于等于 0 的，此时该槽就从 Unused 态变成了 Active 态。 后续如果又有 key 映射到了该槽，那么看它和已存在的 entry 的 key，即 entry->me_key 是否相等。如果不相等，那么要改变规则重新映射；如果相等，那么便找到了指定的 entry，此时便可以更新或返回 entry->me_value。 Dummy 态 假设 key=\"abc\" 映射到了索引为 i 的哈希槽，该槽存储了对应的 entry 在键值对数组中的索引 ix，这时如果将 key=\"abc\" 的键值对给删掉，那么索引为 i 的哈希槽存储的值会变成多少呢？ 可能有人觉得，键值对都删掉了，那么哈希槽也不用再存储它的索引了，应该会重置为 -1 吧。答案是不对的，原因就是我们刚才说的，这么做会导致探测链断裂。 当 entry 被删掉之后，哈希槽存储的值会变成 -2，即 DKIX_DUMMY，表示该槽之前存储过某个 entry 在键值对数组中的索引，但是该 entry 被删除了。注：删除 entry 也不是直接将它从键值对数组中删掉，而是将它的 me_key 和 me_value 字段设置为 NULL。 图中的 dk_indices 中有一个槽存储的是 -2，但很明显之前它存储的应该是 1，只是后续 dk_entries 中索引为 1 的 entry 被删除了。而删除一个 entry，会将它的 me_key 和 me_value 设置为 NULL，并将哈希槽存储的索引设置为 -2，这便是上面提到的伪删除技术。 所以一个哈希槽有三种状态，我们记哈希槽存储的索引为 ix。 1）如果 ix == -1，说明该槽处于 Unused 态，还没有存储任何一个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，那么会 KeyError。 2）如果 ix >= 0，说明该槽处于 Active 态，已经保存了某个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要添加的 entry 的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么直接更新 value。 当基于 key 获取 value 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要搜索的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么返回 entry 的 value。 3）如果 ix == -2，说明该槽处于 Dummy 态，之前存储了某个 entry 在键值对数组中的索引，但之后该 entry 被删除了。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，发现处于 Dummy 态，会明白虽然当前的槽是无效的，但它不是探测链的终点，所以不会报错，而是会继续搜索，这样就保证了探测链的连续性。至于报错，是发现映射出的哈希槽处于 Unused 态，没有存储任何一个 entry 的索引，这就说明 key 对应的 entry 不存在，此时才会 KeyError。 以上就是哈希槽的三种状态，它们之间可以进行转换，但 Unused 态只能转换为 Active 态；Active 态只能转换为 Dummy 态；Dummy 态只能转换为 Active 态。 如果哈希槽存储的 ix == DKIX_EMPTY，那么它处于 Unused 态。如果后续存储了 entry 在键值对数组中的索引，那么 ix >= 0，此时哈希槽会从 Unused 态转换为 Active 态。如果哈希槽存储的索引对应的 entry 被删除，那么 ix 会变成 DKIX_DUMMY，此时哈希槽会从 Active 态转换为 Dummy 态。 那么问题来了，Dummy 态转换为 Active 态，你能猜到会在什么时候发生吗？ 很容易想到，假设新来了一个 entry，它正好撞上了 Dummy 态的哈希槽，那么该槽会从 Dummy 态转为 Active 态。 总结：假设新增一个 entry，它的 key 映射到了索引为 i 的槽，该槽存储的索引为 ix。 如果 ix == -1，说明一上来就有位置可用，那么直接将 entry 追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。也就是说，Python 默认不关心是否有 Dummy 态的哈希槽。 如果 ix >= 0，说明该槽已经有人用了，那么比较 dk_entries[ix].me_key 和要插入的 entry 的 key 是否相等，如果相等，那么更新键值对，不相等则重新映射。 如果 ix == -2，说明该槽之前被使用了，但使用它的 entry 后续又被删除了（伪删除，内存还在）。此时会复用该哈希槽，不过被伪删除的旧 entry 不会被复用，新增的 entry 依旧会追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。 还是这张图，但做了一些修改。图中索引为 5 的哈希槽存储的索引 ix 等于 4，但它经历了以下几个过程。 dk_indices[5] 初始为 -1，即 DKIX_EMPTY，此时处于 Unused 态。 来了一个 entry，映射到了索引为 5 的槽，发现该槽可用，于是将 dk_indices[5] 修改为 1（它在 dk_entries 中的索引），此时哈希槽变成 Active 态。 映射到索引为 5 的哈希槽的 entry 被删除，于是将 dk_indices[5] 修改为 DKIX_DUMMY，即 -2，并将 dk_entries[1] 的 me_key 和 me_value 设置为 NULL，此时哈希槽变成 Dummy 态。 后续又来了一个 entry，也映射到了索引为 5 的哈希槽，发现 dk_indices[5] 等于 -2，处于 Dummy 态。于是将新的 entry 追加到 dk_entries 中，并且在 dk_entries 中的索引为 4，然后再将 dk_indices[5] 修改为 4，此时哈希槽再次变成 Active 态。 那么问题来了，被删除的旧 entry 怎么办？显然会留在那里，它是无法被复用的，当它被删除的那一刻，就和哈希索引数组失去了联系，因为对应的哈希槽存储的值被修改成了 -2。即使后续有新的 entry 映射到了同一个槽，它也不知道该槽在存储 -2 之前存储了什么，所以只能选择追加。 而那些被删除的旧 entry 会在哈希表执行扩缩容的时候被处理，比如哈希表满了，会申请新的存储单元，然后将处于 Active 态的哈希槽对应的 entry 搬过去，其它的则直接丢弃。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希槽的几种状态","id":"183","title":"哈希槽的几种状态"},"184":{"body":"下面我们通过源码，来感受一下字典（哈希表）是如何删除元素的。字典有一个 pop 方法，可以基于 key 弹出指定的 entry，我们就来看一下它的源码实现。 // Objects/dictobject.c\n#define DICT_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))dict_pop, METH_FASTCALL, dict_pop__doc__}, static PyObject *\ndict_pop(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // pop 方法的返回值 PyObject *return_value = NULL; // 指定的 key PyObject *key; // pop 方法支持传入一个默认值 // 当 key 不存在时，如果不指定默认值，pop 方法会报错，否则会返回默认值 PyObject *default_value = NULL; // args 是由参数组成的元组，nargs 表示参数的个数 // 显然参数的个数必须是 1 ~ 2 个 if (!_PyArg_CheckPositional(\"pop\", nargs, 1, 2)) { goto exit; } // args[0] 表示 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示默认值，如果指定了的话 default_value = args[1];\nskip_optional: // 调用 dict_pop_impl 函数 // 从字典中弹出具有指定 key 的 entry，并返回它的 value return_value = _PyDict_Pop((PyObject*)self, key, default_value); exit: return return_value;\n} 具体的逻辑由 _PyDict_Pop 承载，看看它长什么样子？ // Objects/dictobject.c\nPyObject *\n_PyDict_Pop(PyObject *dict, PyObject *key, PyObject *deflt)\n{ Py_hash_t hash; // 快分支，如果键值对的个数为 0 if (((PyDictObject *)dict)->ma_used == 0) { // 那么当指定默认值时，直接返回默认值 if (deflt) { Py_INCREF(deflt); return deflt; } // 否则抛出 KeyError _PyErr_SetKeyError(key); return NULL; } // 计算 key 的哈希值，这里分两种情况 // key 不是字符串，那么调用 PyObject_Hash 函数进行计算 // key 是字符串，那么直接获取，如果获取的结果为 -1（之前没有计算过），也要重新计算 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { // 如果计算的结果是 -1，说明 key 无法被哈希 hash = PyObject_Hash(key); if (hash == -1) return NULL; } return _PyDict_Pop_KnownHash(dict, key, hash, deflt);\n} PyObject *\n_PyDict_Pop_KnownHash(PyObject *dict, PyObject *key, Py_hash_t hash, PyObject *deflt)\n{ Py_ssize_t ix, hashpos; PyObject *old_value, *old_key; PyDictKeyEntry *ep; PyDictObject *mp; assert(PyDict_Check(dict)); mp = (PyDictObject *)dict; // 如果字典为空，即键值对个数为 0 // 那么当指定默认值时，直接返回默认值，否则抛出 KeyError if (mp->ma_used == 0) { if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // mp->ma_keys->dk_lookup 表示探测函数，负责将 key 映射成索引，找到对应的哈希槽 // 然后返回哈希槽存储的 entry 在 dk_entries 中的索引 // 并且在探测函数里面，还会对 old_value 进行修改 ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); if (ix == DKIX_ERROR) return NULL; // 如果 ix == -1，说明映射之后的哈希槽处于 Unused 态 // 说明该 key 对应的 entry 不存在，或者说 key 不存在 if (ix == DKIX_EMPTY || old_value == NULL) { // 如果指定了默认值，返回默认值，否则抛出 KeyError if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // 到这里说明 ix >= 0，即 key 在字典中存在 // 然后检测字典是否是分离表，由于分离表不允许删除 key，所以要重构为结合表 // 分离表就是为了节省内存引入的，因此它的限制较多，这里不做过多讨论 if (_PyDict_HasSplitTable(mp)) { if (dictresize(mp, DK_SIZE(mp->ma_keys))) { return NULL; } ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); assert(ix >= 0); } // 这个函数之前也见过，它负责基于哈希槽存储的 entry 的索引，返回哈希槽的索引 hashpos = lookdict_index(mp->ma_keys, hash, ix); assert(hashpos >= 0); assert(old_value != NULL); // 字典的长度减 1 mp->ma_used--; // 更新字典的版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 将索引为 hashpos 的哈希槽的值设置为 DKIX_DUMMY // 即 dk_indices[hashpos] = DKIX_DUMMY // 注意：不能设置为 DKIX_EMPTY，因为要保护冲突探测链不断裂 dictkeys_set_index(mp->ma_keys, hashpos, DKIX_DUMMY); // 获取指定的 entry，即 dk_entries[ix] ep = &DK_ENTRIES(mp->ma_keys)[ix]; ENSURE_ALLOWS_DELETIONS(mp); // 将 me_key 和 me_value 设置为 NULL，伪删除 // 并减少它们指向的对象的引用计数 old_key = ep->me_key; ep->me_key = NULL; ep->me_value = NULL; Py_DECREF(old_key); ASSERT_CONSISTENT(mp); // 返回弹出的 value return old_value;\n} 整个过程和我们之前的分析一样，这里为了更好地理解，我们再举个实际的例子，将整个流程给串一下。 字典存储了三个键值对，显然它们会按照先来后到的顺序存储在 dk_entries 中。然后 \"a\": 1 映射到了索引为 4 的哈希槽，\"b\": 2 映射到了索引为 0 的哈希槽，\"c\": 3 映射到了索引为 6 的哈希槽。当然实际情况未必是这样，这里只是打个比方。 然后我们再添加一个键值对 mp[\"d\"] = 4，首先要将 \"d\" 映射成索引，假设映射出的索引为 0，由于 dk_indices[0] 的值为 1，而 dk_entries[1].me_key 不等于 \"d\"，所以出现冲突，于是哈希值右移 5 位，重新映射。 第二次映射出的索引为 6，由于 dk_indices[6] 的值为 2，而 dk_entries[2].me_key 也不等于 \"d\"，说明第二次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第三次映射出的索引为 4，由于 dk_indices[4] 的值为 0，而 dk_entries[0].me_key 也不等于 \"d\"，说明第三次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第四次映射出的索引为 2，而 dk_indices[2] 的值为 -1，说明该槽没有人用，于是将 entry 追加到键值对数组中，并将它在 dk_entries 中的索引赋值给 dk_indices[2]。还是那句话，实际情况并不一定是这样，这里只是为了方便解释而刻意举的例子。 所以对于 \"d\": 4 这个键值对来说，0 -> 6 -> 4 -> 2 就是它的冲突探测链，在查找的时候也会按照这个顺序进行查找。比如我们获取 mp[\"d\"]，那么会经历如下过程。 将 key=\"d\" 映射成索引，得到 0，但 dk_entries[dk_indices[0]].me_key 不等于 \"d\"，所以改变策略，重新映射。 第二次映射得到索引 6，但 dk_entries[dk_indices[6]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第三次映射得到索引 4，但 dk_entries[dk_indices[4]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第四次映射得到索引 2，发现 dk_entries[dk_indices[2]].me_key 等于 \"d\"，说明找到了指定的 entry，于是返回它的 value。 以上就是查找的整个过程，这时如果将 key=\"c\" 的 entry 删掉，比如执行 mp.pop(\"c\")，那么会发生什么呢？ 因为 \"c\" 映射到了索引为 6 的槽，当它被删除时，要将 dk_entries[dk_indices[6]] 的 me_key 和 me_value 都设置为 NULL，以及将 dk_indices[6] 设置为 DKIX_DUMMY。然后我们再获取 mp[\"d\"]，第二次映射会得到索引 6，发现该槽存储的值为 -2，就知道该槽并不是探测链的终点，于是会继续映射。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表删除元素源码解析","id":"184","title":"哈希表删除元素源码解析"},"185":{"body":"回顾一下字典的结构： 我们说 ma_used 字段表示字典的长度，它充当了 ob_size，而 dk_nentries 字段表示键值对数组中存储的键值对的个数，那么问题来了，这两个字段啥区别呢？从字面意思来看，这两者似乎是等价的。 相信这个问题对你来说没有任何难度，假设当前添加了 4 个键值对，那么 ma_used 和 dk_nentries 就都是 4。但如果再删除一个键值对，那么 ma_used 会变成 3，而 dk_nentries 还是 4。 所以 ma_used 会随着键值对的删除而减少，但 dk_nentries 保持不变，我们验证一下。 from ctypes import * class PyDictKeysObject(Structure): _fields_ = [(\"dk_refcnt\", c_ssize_t), (\"dk_size\", c_ssize_t), (\"dk_lookup\", c_void_p), (\"dk_usable\", c_ssize_t), (\"dk_nentries\", c_ssize_t), (\"dk_indices\", c_char * 8)] class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", POINTER(PyDictKeysObject)), (\"ma_values\", c_void_p)] d = {1: 1, 2: 2, 3: 3, 4: 4}\nobj = PyDictObject.from_address(id(d))\nprint(obj.ma_used) # 4\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 删除一个键值对\nd.pop(1)\nprint(obj.ma_used) # 3\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 再删除一个\nd.pop(2)\nprint(obj.ma_used) # 2\nprint(obj.ma_keys.contents.dk_nentries) # 4 结果和我们分析的一样，这就是 ma_used 和 dk_nentries 的区别。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » ma_used 和 dk_nentries 的区别","id":"185","title":"ma_used 和 dk_nentries 的区别"},"186":{"body":"以上我们就介绍了哈希表是怎么删除元素的，以及相关的具体细节，下一篇文章来说一说字典的创建，以及它的一些方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 小结","id":"186","title":"小结"},"187":{"body":"到目前为止，我们对字典应该已经有了非常细致的了解了，本篇文章来聊一聊字典的创建和相关操作，通过底层的源码实现，来进一步剖析字典。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 楔子","id":"187","title":"楔子"},"188":{"body":"字典在底层对应 PyDictObject 实例，它是怎么创建的呢？解释器提供了 PyDict_New 函数，会创建一个容量为 8 的字典。 // Objects/dictobject.c // 对于结合表，键值对均由 PyDictKeysObject 维护\n// 它一旦被创建，那么 dk_indices 的长度至少是 8\n// 至于 dk_indices 里面的元素初始为 -1，表示哈希槽尚未被使用\nstatic PyDictKeysObject empty_keys_struct = { 1, /* dk_refcnt */ 1, /* dk_size */ lookdict_split, /* dk_lookup */ 0, /* dk_usable (immutable) */ 0, /* dk_nentries */ {DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY}, /* dk_indices */\n}; #define Py_EMPTY_KEYS &empty_keys_struct\nstatic PyObject *empty_values[1] = { NULL }; PyObject *\nPyDict_New(void)\n{ dictkeys_incref(Py_EMPTY_KEYS); return new_dict(Py_EMPTY_KEYS, empty_values);\n} static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 字典也有缓存池，关于缓存池我们之后再说，这里先不管 if (numfree) { mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); _Py_NewReference((PyObject *)mp); } else { // 为字典申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); if (mp == NULL) { // 由于是先为 PyDictKeysObject 申请内存 // 所以当 PyDictObject 的内存申请失败时，还要处理 PyDictKeysObject dictkeys_decref(keys); if (values != empty_values) { free_values(values); } return NULL; } } // 字段初始化，而 keys 和 values 都是外界提前创建好，然后传过来的 mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 所以整个过程分为两步： 先创建 PyDictKeysObject 实例，底层默认提供了一个 Py_EMPTY_KEYS。 再创建 PyDictObject 实例，然后通过 ma_keys 字段使两者建立联系。 PyDictObject 实例的创建过程我们已经知道了，接下来是 PyDictKeysObject 实例的创建，只有它创建了，才能作为参数传递给 new_dict 函数。 // Objects/dictobject.c static PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // USABLE_FRACTION(size) 表示键值对数组的长度 // 它等于哈希索引数组长度的 2/3 usable = USABLE_FRACTION(size); // 基于哈希索引数组的长度，计算每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 不仅是 PyDictObject，PyDictKeysObject 同样也有自己的缓存池 // 关于它的缓存池，同样之后再聊，这里先不关心 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } // 为 PyDictKeysObject 申请内存，当然还包括两个数组 // 哈希索引数组的内存大小为 es * size // 键值对数组的大小为 sizeof(PyDictKeyEntry) * usable else { dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 字段初始化 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // memset 是一个 C 库函数：memset(p, val, size) // 作用是从指针 p 开始，将之后的 size 个字节的值全部初始化为 val // 显然这里是将哈希索引数组的元素都设置为 -1，注：(char)0xff == -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中每个 entry 的字段都设置为 0 // entry 的内存已经申请了，但还没有保存任何的键值对 // 所以将 me_hash、me_key、me_value 全部设置为 0 // 注：对于指针类型来说，赋值为 0 和 NULL 是等价的，因为 NULL 保存的地址就是 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 以上就是 PyDictKeysObject 实例的创建，当它创建完毕后，再作为参数传递给 new_dict 函数创建 PyDictObject 实例，整个过程还是比较简单的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典的创建","id":"188","title":"字典的创建"},"189":{"body":"首先类型对象定义了三个方法簇： tp_as_number：实例对象作为数值型对象拥有的方法； tp_as_sequence：实例对象作为序列型对象拥有的方法； tp_as_mapping：实例对象作为映射型对象拥有的方法； 当然啦，这三个方法簇对实例对象的类型要求并不严格，比如字符串作为序列型对象，也可以实现 tp_as_number，像字符串实现了里面的取模运算符，用于格式化。 那么字典呢，它的这几个方法簇都定义了哪些方法呢？ // Objects/dictobject.c static PySequenceMethods dict_as_sequence = { 0, /* sq_length */ 0, /* sq_concat */ 0, /* sq_repeat */ 0, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyDict_Contains, /* sq_contains */ 0, /* sq_inplace_concat */ 0, /* sq_inplace_repeat */\n}; static PyMappingMethods dict_as_mapping = { (lenfunc)dict_length, /*mp_length*/ (binaryfunc)dict_subscript, /*mp_subscript*/ (objobjargproc)dict_ass_sub, /*mp_ass_subscript*/\n}; 以上就是字典的几个方法簇，我们从 Python 的角度来演示一下。 d = {\"a\": 1, \"b\": 2, \"c\": 3, \"d\": 4} # dict_as_sequence.sq_contains：判断 key 是否存在\nprint(\"a\" in d) # True # dict_as_mapping.dict_length：返回字典长度\nprint(len(d)) # 4 # dict_as_mapping.dict_subscript：基于 key 获取 value\nprint(d[\"a\"]) # 1 # dict_as_mapping.dict_ass_sub：设置 key、value\nd[\"高老师\"] = \"美男子\"\nprint(d[\"高老师\"]) # 美男子 接下来我们就从源码的角度，来看看这些方法是怎么实现的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典都有哪些方法？","id":"189","title":"字典都有哪些方法？"},"19":{"body":"下面来介绍一些常见的类型在底层的定义。 Python 底层的 C API 和对象的命名都遵循统一的标准，比如类型对象均以 Py***_Type 的形式命名，当然啦，它们都是 PyTypeObject 结构体实例。所以我们发现，Python 里的类在底层是以全局变量的形式静态定义好的。 所以实例对象可以有很多个，但对应的类型对象则是唯一的，在底层直接以全局变量的形式静态定义好了。比如列表的类型是 list，列表可以有很多个，但 list 类型对象则全局唯一。 data1 = [1, 2, 3]\ndata2 = [4, 5, 6]\nprint( data1.__class__ is data2.__class__ is list\n) # True 如果站在 C 的角度来理解的话： data1 和 data2 变量均指向了列表，列表在底层对应 PyListObject 结构体实例，里面字段的含义之前说过。但需要注意的是，指针数组里面保存的是对象的指针，而不是对象。不过为了方便，图中就用对象代替了。 然后列表的类型是 list，在底层对应 PyList_Type，它是 PyTypeObject 结构体实例，保存了列表的元信息（比如内存分配信息、支持的相关操作等）。 而将这两者关联起来的便是 ob_type，它位于 PyObject 中，是所有对象都具有的。因为变量只是一个 PyObject * 指针，那么解释器要如何得知变量指向的对象的类型呢？答案便是通过 ob_type 字段。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 一些常见的类型对象","id":"19","title":"一些常见的类型对象"},"190":{"body":"设置键值对，比如 d[\"a\"] = 1，那么会调用 dict_as_mapping 的 mp_ass_subscript，看一下它的具体逻辑。 // Objects/dictobject.c static int\ndict_ass_sub(PyDictObject *mp, PyObject *v, PyObject *w)\n{ // 参数 mp 指向字典，参数 v 指向 key，参数 w 指向 value // 虽然是设置键值对，但如果 w == NULL，那么也可以实现删除的效果 if (w == NULL) return PyDict_DelItem((PyObject *)mp, v); else return PyDict_SetItem((PyObject *)mp, v, w);\n} int\nPyDict_SetItem(PyObject *op, PyObject *key, PyObject *value)\n{ PyDictObject *mp; Py_hash_t hash; if (!PyDict_Check(op)) { PyErr_BadInternalCall(); return -1; } assert(key); assert(value); mp = (PyDictObject *)op; // 如果 key 不是字符串，或者 key 是字符串、但哈希值等于 -1（尚未计算） // 那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 如果是一个空字典，那么调用 insert_to_emptydict if (mp->ma_keys == Py_EMPTY_KEYS) { return insert_to_emptydict(mp, key, hash, value); } // 不是空字典，那么调用 insertdict return insertdict(mp, key, hash, value);\n} 所以最终会调用 insert_to_emptydict 或 insertdict，这里我们直接看 insertdict 函数的具体实现。 // Objects/dictobject.c static int\ninsertdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject *value)\n{ PyObject *old_value; PyDictKeyEntry *ep; Py_INCREF(key); Py_INCREF(value); // 字典有两种结构，分别是分离表和结合表 // 如果是分离表，那么 key 必须全部是字符串，因为它是为对象的属性字典引入的，而属性肯定是字符串 // 所以当字典使用的是分离表，并且插入的 key 不是字符串时，那么要重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) goto Fail; } // 探测函数，将 key 的哈希值映射成索引，该索引是哈希槽的索引 // 然后返回该哈希槽存储的键值对数组的索引，同时修改 old_value Py_ssize_t ix = mp->ma_keys->dk_lookup(mp, key, hash, &old_value); if (ix == DKIX_ERROR) goto Fail; assert(PyUnicode_CheckExact(key) || mp->ma_keys->dk_lookup == lookdict); MAINTAIN_TRACKING(mp, key, value); // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && old_value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) goto Fail; ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 在字典中不存在 if (ix == DKIX_EMPTY) { assert(old_value == NULL); // 如果键值对数组的长度小于等于 0，说明还没有为键值对数组分配内存 // 那么依旧调用 insertion_resize，该函数后续解释 if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) goto Fail; } // 按照相同的规则对 key 的哈希值进行映射，并返回哈希槽的索引 // 如果没有撞上 Dummy 态的哈希槽，那么 dk_indices[hashpos] 会等于 ix // 如果在映射的过程中，撞上了 Dummy 态的哈希槽，那么直接将该槽的索引返回 // 但不管是哪一种情况，我们都找到了一个合法的槽 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // dk_entries[dk_nentries] 便对应新的 entry，由于内存一开始便分配好了 // 因此所谓添加，其实就是修改它的 me_key 和 me_value 字段 // 将这两个字段的值，修改为参数 key 和参数 value ep = &DK_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries]; // 新的 entry 会添加在键值对数组中索引为 mp->ma_keys->dk_nentries 的位置 // 因为键值对始终是按照先来后到的顺序追加的，然后调用 dictkeys_set_index // 将 entry 在键值对数组中的索引，赋值给 mp->ma_keys->dk_indices[hashpos] dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); // 更新 me_key 和 me_value ep->me_key = key; ep->me_hash = hash; // 如果 mp->ma_values 不为空，证明字典使用的是分离表 if (mp->ma_values) { // 分离表的话，value 统一由 mp->ma_values 维护 // 至于 entry 里面的 me_value 字段则始终为 NULL assert (mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 否则说明字典使用的是结合表，将 entry->me_value 的值设置为 value else { ep->me_value = value; } mp->ma_used++; // 字典长度加 1 mp->ma_version_tag = DICT_NEXT_VERSION(); // 更新字典的版本号 mp->ma_keys->dk_usable--; // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_nentries++; // 键值对已存储的 entry 个数加 1 assert(mp->ma_keys->dk_usable >= 0); ASSERT_CONSISTENT(mp); return 0; } // 如果程序走到这里，说明 ix >= 0，即 key 已存在 // 那么当 old_value != value 时，要对值进行更新 if (old_value != value) { // 分离表，更新 mp->ma_values->values[ix] if (_PyDict_HasSplitTable(mp)) { mp->ma_values[ix] = value; if (old_value == NULL) { /* pending state */ assert(ix == mp->ma_used); mp->ma_used++; } } else { // 结合表，获取 entry，更新它的 me_value 字段 assert(old_value != NULL); DK_ENTRIES(mp->ma_keys)[ix].me_value = value; } mp->ma_version_tag = DICT_NEXT_VERSION(); } Py_XDECREF(old_value); /* which **CAN** re-enter (see issue #22653) */ ASSERT_CONSISTENT(mp); Py_DECREF(key); return 0; Fail: Py_DECREF(value); Py_DECREF(key); return -1;\n} 以上就是获取键值对，源码细节和我们之前分析哈希表时说的是一样的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 设置键值对","id":"190","title":"设置键值对"},"191":{"body":"如果是获取 value，比如 v = d[\"a\"]，那么会调用 dict_as_mapping 的 mp_subscript，看一下它的具体逻辑。 // Objects/dictobject.c\nstatic PyObject *\ndict_subscript(PyDictObject *mp, PyObject *key)\n{ Py_ssize_t ix; Py_hash_t hash; PyObject *value; // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1，那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 探测函数，将 key 映射成索引，并返回对应的哈希槽存储的键值对数组的索引 // 并且在函数内部，还会对参数 value 进行修改，所以这里要传递二级指针 // 如果键值对存在，那么参数 value 就是对应的值，否则 value 会等于 NULL ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 当 ix == -1 或 value == NULL 时，说明 key 对应的键值对不存在 if (ix == DKIX_EMPTY || value == NULL) { if (!PyDict_CheckExact(mp)) { // 但如果 mp 不是字典，即 type(mp) is not dict // 那么说明 mp 的类型一定继承了 dict PyObject *missing, *res; _Py_IDENTIFIER(__missing__); // 检测 mp 是否定义了 __missing__ 方法，如果定义了则调用 // 所以该方法要定义在继承了 dict 的子类中 missing = _PyObject_LookupSpecial((PyObject *)mp, &PyId___missing__); if (missing != NULL) { res = PyObject_CallFunctionObjArgs(missing, key, NULL); Py_DECREF(missing); return res; } else if (PyErr_Occurred()) return NULL; } // 到这里说明 key 不存在，并且也没有定义 __missing__，那么 KeyError _PyErr_SetKeyError(key); return NULL; } // 否则说明键值对存在，那么增加引用计数，返回 value Py_INCREF(value); return value;\n} 所以获取 value 的话，也比较简单，关键在于里面有一个 __missing__ 方法，我们来解释一下。 class Dict(dict): def __getitem__(self, item): return super().__getitem__(item) def __missing__(self, key): return f\"不存在的 key：{key}\" d = Dict({\"a\": 1, \"b\": 2})\n# 会执行 Dict.__getitem__(d, \"a\")\n# 在内部会调用字典的 __getitem__\nprint(d[\"a\"]) # 1\nprint(d[\"b\"]) # 2 # 而在调用字典的 __getitem__ 时，如果发现 key 不存在\n# 那么会尝试寻找 __missing__ 方法\nprint(d[\"c\"]) # 不存在的 key：c\nprint(d[\"高老师\"]) # 不存在的 key：高老师 以上就是获取键值对。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 基于 key 获取 value","id":"191","title":"基于 key 获取 value"},"192":{"body":"关于字典是怎么创建的，以及它添加键值对、基于键获取值的源码细节，我们就分析完了。当然还没有结束，字典还有很多的自定义方法，我们下一篇文章来剖析这些自定义方法的实现细节。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 小结","id":"192","title":"小结"},"193":{"body":"上一篇文章我们介绍了字典的创建过程，和一些基本操作，这些操作都对应一个魔法方法。但除了这些魔法方法之外，每个对象还可以单独定义很多自己的方法，这些方法统一由类型对象的 tp_methods 字段维护，当然这些之前已经说过了。 里面有很多的自定义方法，比如 get、pop、setdefault 等等，我们来剖析一下。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 楔子","id":"193","title":"楔子"},"194":{"body":"获取指定 key 对应的 value，如果 key 不存在，那么返回默认值。 d = {\"name\": \"古明地觉\"}\nprint(d.get(\"name\"))\n\"\"\"\n古明地觉\n\"\"\"\n# key 不存在，返回默认值 None\nprint(d.get(\"desc\"))\n\"\"\"\nNone\n\"\"\"\n# 当然也可以指定默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\" 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_GET_METHODDEF \\ {\"get\", (PyCFunction)(void(*)(void))dict_get, METH_FASTCALL, dict_get__doc__}, static PyObject *\ndict_get(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; // 返回值 PyObject *key; // 指定的 key PyObject *default_value = Py_None; // 默认值，默认为 None // get 方法接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"get\", nargs, 1, 2)) { goto exit; } // args[0] 便是指定的 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 便是传入的默认值，如果有的话 default_value = args[1];\nskip_optional: // 调用 dict_get_impl return_value = dict_get_impl(self, key, default_value); exit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_get_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val = NULL; Py_hash_t hash; // 哈希值 Py_ssize_t ix; // 哈希槽存储的键值对数组的索引 // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 获取 key 对应的哈希槽存储的键值对数组的索引 ix = (self->ma_keys->dk_lookup) (self, key, hash, &val); if (ix == DKIX_ERROR) return NULL; // key 不存在，那么将默认值赋值给 val if (ix == DKIX_EMPTY || val == NULL) { val = default_value; } // 增加 val 的引用计数，然后返回 Py_INCREF(val); return val;\n} 以上就是字典的 get 方法，非常简单。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 get 方法","id":"194","title":"字典的 get 方法"},"195":{"body":"这是一个非常强大的方法，但是用的人不是很多。它和 get 方法类似，都是传入一个 key 和一个默认值，如果 key 存在，那么返回 key 对应的 value，否则返回默认值。但它和 get 方法不同的是，setdefault 在 key 不存在时，会将 key 和默认值添加到字典中。 d = {\"name\": \"古明地觉\"}\n# 当 key 存在时，两个方法的效果是一样的，都等价于 d[key]\nprint(d.get(\"name\"))\nprint(d.setdefault(\"name\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 但当 key 不存在时，就有差别了\n# \"desc\" 这个 key 不存在，返回默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 并且原始的字典不受影响\nprint(d)\n\"\"\"\n{'name': '古明地觉'}\n\"\"\" # 但对于 setdefault 来说，key 不存在时\n# 会将 key 和默认值添加进去，然后返回默认值\nprint(d.setdefault(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 原始的字典会发生改变\nprint(d)\n\"\"\"\n{'name': '古明地觉', 'desc': '地灵殿美少女'}\n\"\"\" 所以当获取的 key 不存在时，v = d.setdefault(key, value) 等价于如下。 d[key] = value v = d[key] 那么 setdefault 一般用在什么地方呢？举个例子。 data = [ (\"古明地觉\", \"2020\", 5), (\"古明地觉\", \"2020\", 2), (\"古明地觉\", \"2021\", 1), (\"古明地觉\", \"2021\", 4), (\"古明地觉\", \"2021\", 3), (\"芙兰朵露\", \"2022\", 7), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2023\", 4), (\"芙兰朵露\", \"2023\", 1)\n]\n# 对于上面这种数据，我们需要变成下面这个样子\n\"\"\"\n{ '古明地觉': { '2020': [5, 2], '2021': [1, 4, 3] }, '芙兰朵露': { '2022': [7, 3, 3], '2023': [4, 1] }\n}\n\"\"\"\n# 如果使用 setdefault 方法，就非常好解决了\nd = {}\nfor name, year, cnt in data: d.setdefault(name, {}).setdefault(year, []).append(cnt)\nprint(d) 下面来看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_SETDEFAULT_METHODDEF \\ {\"setdefault\", (PyCFunction)(void(*)(void))dict_setdefault, METH_FASTCALL, dict_setdefault__doc__}, static PyObject *\ndict_setdefault(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 这部分和 get 方法是类似的 PyObject *return_value = NULL; PyObject *key; PyObject *default_value = Py_None; if (!_PyArg_CheckPositional(\"setdefault\", nargs, 1, 2)) { goto exit; } key = args[0]; if (nargs < 2) { goto skip_optional; } default_value = args[1];\nskip_optional: return_value = dict_setdefault_impl(self, key, default_value);\nexit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_setdefault_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val; val = PyDict_SetDefault((PyObject *)self, key, default_value); Py_XINCREF(val); return val;\n} 所以核心在于 PyDict_SetDefault 函数，这个函数比较长，但逻辑不难理解。 // Objects/dictobject.c\nPyObject *\nPyDict_SetDefault(PyObject *d, PyObject *key, PyObject *defaultobj)\n{ PyDictObject *mp = (PyDictObject *)d; PyObject *value; Py_hash_t hash; if (!PyDict_Check(d)) { PyErr_BadInternalCall(); return NULL; } // 获取哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 如果 mp->ma_keys 等于 Py_EMPTY_KEYS，证明字典是空的，那么 key 肯定不存在 // 将 key 和 defaultobj 添加进字典中，并返回 defaultobj if (mp->ma_keys == Py_EMPTY_KEYS) { if (insert_to_emptydict(mp, key, hash, defaultobj) < 0) { return NULL; } return defaultobj; } // 如果字典使用的是分离表，并且 key 不是字符串 // 意味着字典的结构要发生改变，重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) return NULL; } // 获取哈希槽存储的键值对数组的索引 Py_ssize_t ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) { return NULL; } ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 不存在，那么要先添加键值对 if (ix == DKIX_EMPTY) { PyDictKeyEntry *ep, *ep0; value = defaultobj; // 是否还有可用空间，如果没有，调用 insertion_resize if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) { return NULL; } } // 返回 key 映射之后的哈希槽的索引 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // 新添加的 entry 在键值对数组中的索引为 mp->ma_keys->dk_nentries // 将该索引赋值给 dk_indices[hashpose] ep0 = DK_ENTRIES(mp->ma_keys); ep = &ep0[mp->ma_keys->dk_nentries]; dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); Py_INCREF(key); Py_INCREF(value); MAINTAIN_TRACKING(mp, key, value); ep->me_key = key; ep->me_hash = hash; // 如果字典是分离表 if (_PyDict_HasSplitTable(mp)) { // 值由 mp->ma_values 存储 assert(mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 如果字典是结合表，那么键和值均保存在 entry 中 else { ep->me_value = value; } // 字典长度加 1 mp->ma_used++; // 修改版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_usable--; // 键值对数组已经容纳的 entry 个数加 1 mp->ma_keys->dk_nentries++; assert(mp->ma_keys->dk_usable >= 0); } // ... ASSERT_CONSISTENT(mp); // 返回 value return value;\n} 以上便是 setdefault 方法。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 setdefault 方法","id":"195","title":"字典的 setdefault 方法"},"196":{"body":"字典的 pop 方法之前已经说过了，这里来看一下 popitem 方法。 d = {\"x\": 1, \"y\": 2, \"z\": 3}\n# pop 方法可以弹出指定的 key，并返回对应的 value\n# 如果 key 不存在，并且没有指定默认值，会抛出 KeyError，否则返回默认值\nprint(d.pop(\"x\")) # 1 # 而 popitem 方法则是弹出字典的最后一个键值对\nd = {\"x\": 1, \"y\": 2, \"z\": 3}\nprint(d.popitem()) # ('z', 3)\nprint(d) # {'x': 1, 'y': 2} 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_POPITEM_METHODDEF \\ {\"popitem\", (PyCFunction)dict_popitem, METH_NOARGS, dict_popitem__doc__}, static PyObject *\ndict_popitem(PyDictObject *self, PyObject *Py_UNUSED(ignored))\n{ return dict_popitem_impl(self);\n} // Objects/dictobject.c\nstatic PyObject *\ndict_popitem_impl(PyDictObject *self)\n{ Py_ssize_t i, j; PyDictKeyEntry *ep0, *ep; PyObject *res; // 返回值，一个二元组，负责存储 key 和 value res = PyTuple_New(2); if (res == NULL) return NULL; // 如果字典的长度为 0，那么抛出 KeyError if (self->ma_used == 0) { Py_DECREF(res); PyErr_SetString(PyExc_KeyError, \"popitem(): dictionary is empty\"); return NULL; } // 如果字典使用分离表，那么当 popitem 之后，要重构为结合表 // 分离表要求 key 必须全部是字符串，并且不能删除键值对 if (self->ma_keys->dk_lookup == lookdict_split) { if (dictresize(self, DK_SIZE(self->ma_keys))) { Py_DECREF(res); return NULL; } } ENSURE_ALLOWS_DELETIONS(self); // 获取键值对数组 ep0 = DK_ENTRIES(self->ma_keys); // ma_keys->dk_nentries 表示键值对数组中已使用的 entry 个数 // 那么 entry 的最大索引就是 ma_keys->dk_nentries - 1 i = self->ma_keys->dk_nentries - 1; // 从 i 开始往前遍历，找到第一个 me_value != NULL 的 entry // 因为被删除的 entry 依旧会驻留在键值对数组中，但 me_key、me_value 被设置为 NULL while (i >= 0 && ep0[i].me_value == NULL) { i--; } assert(i >= 0); // 获取 entry ep = &ep0[i]; // 基于哈希槽存储的索引，获取哈希槽的索引 j = lookdict_index(self->ma_keys, ep->me_hash, i); assert(j >= 0); assert(dictkeys_get_index(self->ma_keys, j) == i); // 因为 entry 被删除了，所以对应的哈希槽存储的值要修改为 DKIX_DUMMY dictkeys_set_index(self->ma_keys, j, DKIX_DUMMY); // 将 key 和 value 保存在元组中 PyTuple_SET_ITEM(res, 0, ep->me_key); PyTuple_SET_ITEM(res, 1, ep->me_value); // 因为被弹出了，所以 entry 的 me_key 和 me_value 要重置为 NULL ep->me_key = NULL; ep->me_value = NULL; // 这一步一会儿解释 self->ma_keys->dk_nentries = i; // 键值对个数减 1 self->ma_used--; self->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(self); return res;\n} 以上就是 popitem 方法，但是里面有一行 self->ma_keys->dk_nentries = i 估计让人有些费解，我们解释一下。 首先当键值对数组的空间申请之后，entry 就已经存在了，初始状态下的 entry 的 me_key 和 me_value 均为 NULL。所以一个被伪删除的 entry 和初始的 entry 是等价的，下面假设有这么一个键值对数组。 对于一个容量为 16 的哈希表，它的键值对数组的长度为 10，由于 dk_nentries = 7，说明键值对数组使用了 7 个 entry。而在之后，第 2 个 entry 和第 7 个 entry 被删除了，一旦删除，那么它的 me_key 和 me_value 会被重置为 NULL，和初始 entry 是等价的。 这时候如果执行 popitem，那么会弹出最后一个 me_value 不为 NULL 的 entry，即没有被伪删除的 entry，对于当前来说就是第 6 个 entry。所以源码中的 i 初始等于 dk_nentries - 1，然后往前遍历，最终会找到索引为 5 的 entry，所以循环之后 i = 5。然后将索引为 5 的 entry 的 me_key 和 me_value 设置为 NULL，因为它被删除了。 注意：这里关键来了，既然变量 i 保存的是最后一个 me_value != NULL 的 entry 的索引，那么当它被删除之后，就意味着从索引 i 开始，后面所有的 entry 都相当于回归到了初始状态，那么直接将 dk_nentries 设置为 i。 由于 dk_nentries 被设置为 i，后续再添加键值对时，就会添加到索引为 i 的位置。对于当前来说，添加键值对时，修改的是 dk_entries[5] 的 me_key 和 me_value，而不是 dk_entries[7] 的 me_key 和 me_value。 所以通过 popitem 方法，被删除的 entry 是有可能实现复用的。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 popitem 方法","id":"196","title":"字典的 popitem 方法"},"197":{"body":"以上我们就简单分析了字典的几个自定义方法，下一篇文章来聊一聊字典的扩容。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 小结","id":"197","title":"小结"},"198":{"body":"在介绍字典的底层结构时我们看到，当已使用的 entry 数量达到总容量的 2/3 时，会发生扩容。 而在早期，哈希表只使用一个键值对数组，这个键值对数组不仅要存储具体的 entry，还要承载哈希索引数组的功能。本来这个方式很简单，但是内存浪费严重，于是后面 Python 官方就将一个数组拆成两个数组来实现。 不是说只能用 2/3 吗？那就只给键值对数组申请 2/3 容量的空间，并且只负责存储键值对。至于索引，则由哈希索引数组来承载。通过将 key 映射成索引，找到指定的哈希槽，再根据槽里面存储的索引，找到键值对数组中存储的 entry。 因此减少内存开销的核心就在于，避免键值对数组的浪费。 所以哈希索引数组的长度就可以看成是哈希表的容量，而键值对数组的长度本身就是哈希索引数组长度的 2/3、或者说容量的 2/3。那么很明显，当键值对数组满了，就说明当前的哈希表要扩容了。 // Objects/dictobject.c\n#define GROWTH_RATE(d) ((d)->ma_used*3) 扩容之后的新哈希表的容量要大于等于 ma_used * 3，注意是大于等于 ma_used * 3，不是 dk_nentries * 3。因为 dk_nentries 还包含了被删除的 entry，但哈希表在扩容的候会将其丢弃，所以扩容之后新哈希表的容量取决于 ma_used。 当然啦，哈希表的容量还要等于 2 的幂次方，所以有两个条件： 大于等于 ma_used * 3； 等于 2 的幂次方； 基于以上两个限制条件，取到的最小值便是扩容之后的容量。而扩容的具体过程我们稍后会介绍，目前先来回顾一下基础知识。 以上是字典的底层结构，假设变量 mp 指向了 PyDictObject 实例，那么可以得到如下信息。 mp->ma_keys->dk_indices 便是哈希索引数组，它的长度便是哈希表的容量。 mp->ma_keys->dk_entries 便是键值对数组，里面的一个 entry 就是一个键值对。 如果字典使用的是结合表，那么 entry 的 me_key、me_value 字段负责存储键和值，此时 mp->ma_values 为 NULL。 如果字典使用的是分离表，那么 entry 的 me_key 字段负责存储键，me_value 字段则始终为 NULL，此时由 mp->ma_values 负责存储值，这种做法可以让多个字典共享一组 key，从而节省内存。 因为分离表是 Python 针对实例对象的属性字典单独设计的，我们平时创建的都是结合表，所以一开始并没有讨论分离表。但分离表其实非常简单，这里来补充一下吧。现在假设有一个字典，里面有三个键值对 \"a\": 1, \"b\": 2, \"c\": 3，我们看一下分别使用结合表和分离表存储时，字典的结构是什么样子。 所以结合表是键和值存在一起，分离表是键和值分开存储，非常好理解。我们自己创建的字典，使用的都是结合表，分离表是为了减少对象属性字典的内存使用而专门引入的。因此对于一个分离表而言，它的 key 一定都是字符串，否则不可能是分离表。而如果 key 都是字符串，那么既可以是分离表，也可以是结合表。 接着是转换关系：分离表可以重构为结合表，但反过来不行。 好，下面我们来看一下扩容逻辑，它由 dictresize 函数负责。 // Objects/dictobject.c #define PyDict_MINSIZE 8 static int\ndictresize(PyDictObject *mp, Py_ssize_t minsize)\n{ // 参数 minsize 表示字典的 ma_used * 3，即长度 * 3 Py_ssize_t newsize, numentries; // mp->ma_keys PyDictKeysObject *oldkeys; // mp->ma_values PyObject **oldvalues; // mp->ma_values->dk_entries PyDictKeyEntry *oldentries, *newentries; /* Find the smallest table size > minused. */ // 初始容量为 8，如果 newsize < minsize，那么不断循环 // 直到条件不满足时，便找到了大于等于 minsize 的最小 2 的幂次方数 // newsize 便是字典扩容之后的新容量 for (newsize = PyDict_MINSIZE; newsize < minsize && newsize > 0; newsize <<= 1) ; if (newsize <= 0) { PyErr_NoMemory(); return -1; } // 获取扩容之前的 ma_keys oldkeys = mp->ma_keys; // 在介绍字典的创建时，我们说过这个函数，它负责为 PyDictKeysObject 实例申请内存 mp->ma_keys = new_keys_object(newsize); if (mp->ma_keys == NULL) { mp->ma_keys = oldkeys; return -1; } assert(mp->ma_keys->dk_usable >= mp->ma_used); // 设置探测函数 if (oldkeys->dk_lookup == lookdict) mp->ma_keys->dk_lookup = lookdict; // 字典的长度 numentries = mp->ma_used; // 扩容之前的键值对数组 oldentries = DK_ENTRIES(oldkeys); // 扩容之后的键值对数组 newentries = DK_ENTRIES(mp->ma_keys); // 扩容之前的 ma_values oldvalues = mp->ma_values; // 如果 oldvalues 不为 NULL，说明字典使用的是分离表 // 那么当字典发生扩容时，要转成结合表 if (oldvalues != NULL) { // 将旧的键值对数组的 entry 拷贝到新的键值对数组中 for (Py_ssize_t i = 0; i < numentries; i++) { assert(oldvalues[i] != NULL); PyDictKeyEntry *ep = &oldentries[i]; PyObject *key = ep->me_key; Py_INCREF(key); // key 始终存储在 entry 中 newentries[i].me_key = key; // 设置哈希值 newentries[i].me_hash = ep->me_hash; // 将 mp->ma_values 里面的值，赋值给 entry->me_value newentries[i].me_value = oldvalues[i]; } // 旧的 ma_keys 和 ma_values 要释放掉 dictkeys_decref(oldkeys); mp->ma_values = NULL; if (oldvalues != empty_values) { free_values(oldvalues); } } // 说明字典使用的是结合表，重构的结果依旧是结合表 else { // combined table. // 如果 entry 的数量等于字典的长度，说明没有被删除的 entry，那么直接 memcpy 过去即可 if (oldkeys->dk_nentries == numentries) { memcpy(newentries, oldentries, numentries * sizeof(PyDictKeyEntry)); } // 否则遍历 oldentries，将 me_value != NULL 的 entry 拷贝过去 else { PyDictKeyEntry *ep = oldentries; for (Py_ssize_t i = 0; i < numentries; i++) { while (ep->me_value == NULL) ep++; newentries[i] = *ep++; } } assert(oldkeys->dk_lookup != lookdict_split); assert(oldkeys->dk_refcnt == 1); // 缓存池逻辑，后续聊 if (oldkeys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { _Py_DEC_REFTOTAL; keys_free_list[numfreekeys++] = oldkeys; } else { _Py_DEC_REFTOTAL; PyObject_FREE(oldkeys); } } // 到此键值对数组的元素就拷贝完了，然后还要进行索引映射，并存储在哈希槽中 build_indices(mp->ma_keys, newentries, numentries); // dk_usable 表示还可以容纳多少个键值对 // dk_nentries 表示已经容纳了多少个键值对 // 而 numentries 表示字典的长度，所以重构之后 // dk_usable 的大小要减去 numentries，dk_nentries 直接等于 numentries mp->ma_keys->dk_usable -= numentries; mp->ma_keys->dk_nentries = numentries; return 0;\n} 因为要对哈希表的种类分情况讨论，所以导致代码有点长，但逻辑不难理解： 首先确定哈希表的容量，它要满足 2 的幂次方，并且大于等于 ma_used * 3。 为 ma_keys 重新申请内存。 根据哈希表的种类分情况讨论，但核心都是将旧的没有被删除的 entry 搬过去。 释放 ma_keys，如果字典之前是分离表，还要释放 ma_values。 以上就是哈希表的扩容，或者说字典的扩容，我们就介绍到这儿，下一篇文章来介绍字典的缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"46. 字典是怎么扩容的？它会经历哪些过程？","id":"198","title":"46. 字典是怎么扩容的？它会经历哪些过程？"},"199":{"body":"本篇文章来聊一聊字典的缓存池，我们知道字典有一个 ma_keys 字段和一个 ma_values 字段。当哈希表为分离表时，键由 ma_keys 维护，值由 ma_values 维护；当哈希表为结合表时，键和值均由 ma_keys 维护。 那么当我们销毁一个 PyDictObject 时，也肯定要先释放 ma_keys 和 ma_values。 如果是分离表，会将每个 value 的引用计数减 1，然后释放 ma_values；再将每个 key 的引用计数减 1，然后释放 ma_keys。最后再释放 PyDictObject 本身。 如果是结合表，由于 key、value 都在 ma_keys 中，将每个 key、value 的引用计数减 1 之后，只需释放 ma_keys 即可。最后再释放 PyDictObject 本身。 整个过程还是很清晰的，只不过这里面遗漏了点什么东西，没错，就是缓存池。在介绍浮点数的时候，我们说不同的对象都有自己的缓存池，当然字典也不例外。并且除了 PyDictObject 之外，PyDictKeysObject 也有相应的缓存池，毕竟它负责存储具体的键值对。 那么下面我们就来研究一下这两者的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 楔子","id":"199","title":"楔子"},"2":{"body":"我们上面说了， Python 解释器 = Python 编译器 + Python 虚拟机 ，当解释器执行 py 文件时都经历了哪些过程呢？ Read File、Scanner、Parser、Compiler 都是由 Python 编译器负责的，Code Eval 则由 Python 虚拟机负责。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。 而 Python 编译器和 Python 虚拟机组合起来，便是 Python 解释器。 如果你了解 Java，那么应该知道 Java 也有编译器和虚拟机。只不过 Java 的编译器和虚拟机是分开的，而 Python 则是整合在一起的。 不过在后续介绍 Python 源码的时候，我们暂不涉及 Python 编译器的部分，也就是 Parser 目录里面的代码不做分析，因为涉及到编译原理。而且编译这一过程也不是 Python 语言独有的，任何一门编程语言、当然还有 SQL 都会涉及到编译。所以探究 Python 代码的编译过程没太大意义，我们的重点是 Python 代码的编译结果，以及虚拟机是如何执行的？","breadcrumbs":"1. CPython 源码长什么样子？ » 解释器、编译器、虚拟机","id":"2","title":"解释器、编译器、虚拟机"},"20":{"body":"不同类型的实例对象，在底层由不同的结构体实现，比如整数对应 PyLongObject 实例、浮点数对应 PyFloatObject 实例、列表对应 PyListObject 实例等等。 但所有的类型对象，在底层由同一个结构体实现，它们都是 PyTypeObject 实例。而 PyTypeObject 结构体在实例化时，内部字段接收的值不同，那么生成的类型对象也不同，可以是 PyLong_Type、PyFloat_Type、PyList_Type 等等。并且每个类型对象都是唯一的，比如在程序中可以创建很多个列表（PyListObject 实例），但类型对象 <class 'list'>（PyList_Type）只会存在一个。 因为类型对象都是静态定义在源码中的，并以全局变量的形式存在。而将实例对象和类型对象关联起来的，则是实例对象的 ob_type 字段，在 Python 里面可以通过调用 type 或者获取 __class__ 属性查看。 关于类型对象的更多内容，后续会继续介绍。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 小结","id":"20","title":"小结"},"200":{"body":"字典的缓存池和列表的缓存池高度相似，都是采用数组实现的，并且容量也是 80 个。 // Objects/dictobject.c\n#define PyDict_MAXFREELIST 80 static PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0; 下面看一下字典的销毁过程，因为放入缓存池这个动作，一定是在对象销毁时发生的。 // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 将 dk_refcnt 减 1 // 如果字典是结合表，那么 dk->dk_refcnt 减 1 之后一定为 0 // 如果字典是分离表，那么 dk->dk_refcnt 减 1 之后则不一定为 0 if (--dk->dk_refcnt == 0) { // 释放 ma_keys，该函数稍后再聊 free_keys_object(dk); }\n} static void\ndict_dealloc(PyDictObject *mp)\n{ PyObject **values = mp->ma_values; PyDictKeysObject *keys = mp->ma_keys; Py_ssize_t i, n; // 因为要被销毁，所以让 GC 不再跟踪 PyObject_GC_UnTrack(mp); // 用于延迟释放 Py_TRASHCAN_BEGIN(mp, dict_dealloc) // 如果 values 不为 NULL，说明是分离表 if (values != NULL) { if (values != empty_values) { // 将每个 value 的引用计数减 1 for (i = 0, n = mp->ma_keys->dk_nentries; i < n; i++) { Py_XDECREF(values[i]); } // 释放 ma_values free_values(values); } // 将 ma_keys->dk_refcnt 减 1，至于是否会释放 ma_keys // 则看是否还有其它组的 value 使用它 dictkeys_decref(keys); } // 否则说明是结合表 else if (keys != NULL) { // 结合表的话，dk_refcnt 一定等于 1，因为每组 value 都独占一组 key assert(keys->dk_refcnt == 1); // dk_refcnt 减 1 之后等于 0，内部会调用 free_keys_object // 在里面会先将每个 key、value 的引用计数减 1，然后再释放 ma_keys dictkeys_decref(keys); } // 如果 numfree 没达到 80，那么放入缓存池 if (numfree < PyDict_MAXFREELIST && Py_TYPE(mp) == &PyDict_Type) // PyDictObject 缓存池是一个数组，直接添加在数组的尾部即可，然后 numfree 自增 1 free_list[numfree++] = mp; else // 否则将空间交还给系统堆 Py_TYPE(mp)->tp_free((PyObject *)mp); Py_TRASHCAN_END\n} 同理，当创建字典时，也会优先从缓存池里面获取。 // Objects/dictobject.c static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 如果 numfree != 0，证明缓存池有可用元素 if (numfree) { // 从缓存池当中获取 mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); // 将引用计数设置为 1 _Py_NewReference((PyObject *)mp); } else { // 否则从堆区申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); // ... } // 初始化字段，然后返回 (PyObject *)mp mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 因此在缓存池的实现上，字典和列表有着很高的相似性。不仅都由数组实现，在销毁的时候也会放在数组的尾部，创建的时候也会从数组的尾部获取。当然啦，因为这么做符合数组的特性，如果销毁和创建都是在数组的头部操作，那么时间复杂度就从 O(1) 变成了 O(n)。 我们用 Python 来测试一下： d1 = {k: 1 for k in \"abcdef\"}\nd2 = {k: 1 for k in \"abcdef\"}\nprint(\"id(d1):\", id(d1))\nprint(\"id(d2):\", id(d2))\n# 放到缓存池的尾部\ndel d1\ndel d2\n# 缓存池：[d1, d2] # 从缓存池的尾部获取\n# 显然 id(d3) 和上面的 id(d2) 是相等的\nd3 = {k: 1 for k in \"abcdefghijk\"}\n# id(d4) 和上面的 id(d1) 是相等的\nd4 = {k: 1 for k in \"abcdefghijk\"}\nprint(\"id(d3):\", id(d3))\nprint(\"id(d4):\", id(d4))\n\"\"\"\nid(d1): 140079181793600\nid(d2): 140079181775488\nid(d3): 140079181775488\nid(d4): 140079181793600\n\"\"\" 输出结果和我们的预期是相符合的，以上就是 PyDictObject 的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictObject 缓存池","id":"200","title":"PyDictObject 缓存池"},"201":{"body":"PyDictKeysObject 也有自己的缓存池，同样基于数组实现，大小是 80。 // Objects/dictobject.c #define PyDict_MAXFREELIST 80\n// PyDictObject 缓存池以及容量\nstatic PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0;\n// PyDictKeysObject 缓存池以及容量\nstatic PyDictKeysObject *keys_free_list[PyDict_MAXFREELIST];\nstatic int numfreekeys = 0; 来看一下 PyDictKeysObject 的销毁过程： // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 分离表：多组 value 可以共享一组 key // 结合表：每组 value 独占一组 key // 因此要先将 dk_refcnt 减 1，如果结果为 0，那么才能释放 ma_keys if (--dk->dk_refcnt == 0) { free_keys_object(dk); }\n} static void\nfree_keys_object(PyDictKeysObject *keys)\n{ // 获取键值对数组 PyDictKeyEntry *entries = DK_ENTRIES(keys); Py_ssize_t i, n; // 遍历 dk_entries，减少 key、value 的引用计数 for (i = 0, n = keys->dk_nentries; i < n; i++) { Py_XDECREF(entries[i].me_key); // 如果是分离表，那么 me_value == NULL // 而当参数为 NULL 时，Py_XDECREF 不做任何处理 Py_XDECREF(entries[i].me_value); } // 放入缓存池，除了要保证缓存池没满之外，还要保证 dk_size = 8 // 也就是说，只有容量为 8 的哈希表的 PyDictKeysObject 才会被缓存 if (keys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { keys_free_list[numfreekeys++] = keys; return; } // 如果条件不满足，释放 ma_keys，将内存交还给系统堆 PyObject_FREE(keys);\n} 所以 PyDictKeysObject 的缓存池和列表的缓存池同样是高度相似的，只不过它想要被缓存，除了保证缓存池有剩余空间之外，还要满足哈希表的容量等于 8，这个限制是出于对内存方面的考量。 以上是 ma_keys 的销毁过程，再来看看它的创建过程。 // Objects/dictobject.c // 为 PyDictKeysObject 实例申请内存\nstatic PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // 获取键值对数组的长度 usable = USABLE_FRACTION(size); // 计算哈希索引数组中每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 如果容量等于 8，并且缓存池有可用元素，那么从缓存池中获取 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } else { // 否则在堆区申请内存，而内存包含三部分 // sizeof(PyDictKeysObject)：结构体 PyDictKeysObject 的大小 // es * size：哈希索引数组的大小 // sizeof(PyDictKeyEntry) * usable)：键值对数组的大小 dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 初始化字段 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // 将哈希索引数组中的每个元素都设置成 -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中的每个元素（entry）的所有字段都设置成 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 非常简单，我们来验证一下。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d1 = {k: 1 for k in \"komeiji satori\"}\nprint( \"d1.ma_keys:\", PyDictObject.from_address(id(d1)).ma_keys\n)\n# 键值对个数超过了 8，哈希表的容量必然也超过了 8\n# 那么当销毁 d1 的时候，d1.ma_keys 不会被缓存，而是会直接释放掉\ndel d1 d2 = {k: 1 for k in \"abc\"}\nprint( \"d2.ma_keys:\", PyDictObject.from_address(id(d2)).ma_keys\n)\n# 容量等于 8，所以 d2.ma_keys 会被缓存\ndel d2 d3 = {k: 1 for k in \"komeiji koishi\"}\nprint( \"d3.ma_keys:\", PyDictObject.from_address(id(d3)).ma_keys\n)\n# 尽管 d2 的 ma_keys 被缓存起来了，但是 d3 的 dk_size 大于 8\n# 因此它不会从缓存池中获取，而是重新创建 d4 = {k: 1 for k in \"abc\"}\nprint( \"d4.ma_keys:\", PyDictObject.from_address(id(d4)).ma_keys\n)\n# d4 的 dk_size 等于 8，因此它会从缓存池中获取，从而复用被销毁的 d2.ma_keys\n# 最终打印结果如下\n\"\"\"\nd1.ma_keys: 94324986272656\nd2.ma_keys: 140165216613312\nd3.ma_keys: 140165225069456\nd4.ma_keys: 140165216613312\n\"\"\" 从打印的结果来看，由于 d4.ma_keys 和 d2.ma_keys 是相同的，因此证实了我们的结论。不像列表和字典，它们是只要被销毁，就会放到缓存池里面，因为它们没有存储具体的数据，大小是固定的。但 PyDictKeysObject 不同，由于它存储了 entry，每个 entry 占 24 字节，如果内部的 entry 非常多，那么缓存起来会有额外的内存开销。因此 Python 的策略是，只有在哈希表容量等于 8 的时候，才会缓存。当然这三者在缓存池的实现上，是基本一致的。 不难看出，Python 在性能和内存使用方面都做了考量。但如果你追求更高的效率，那么也可以自己定制 Python 解释器，比如增大缓存池的容量等等，用更多的空间去换取时间。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictKeysObject 缓存池","id":"201","title":"PyDictKeysObject 缓存池"},"202":{"body":"到此，字典相关的内容就全部介绍完了。和元组一样，字典也在我们看不到的地方被大量使用，比如对象的属性字典、名字空间等等。正因为解释器内部也在大量使用字典，所以字典是一个被高度优化的数据结构，不仅要保证搜索效率，还要减少内存使用。 下一篇文章，我们来介绍 Python 的集合。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 小结","id":"202","title":"小结"},"203":{"body":"本篇文章来聊一聊 Python 的集合是怎么实现的？前面我们介绍了字典的实现原理，它底层是基于哈希表实现的，而集合也是如此。 事实上，集合就类似于没有 value 的字典。","breadcrumbs":"48. 解密集合的实现原理 » 楔子","id":"203","title":"楔子"},"204":{"body":"那么集合都有哪些用处呢？ 1）去重 chars = [\"a\", \"b\", \"a\", \"c\", \"c\"] print( list(set(chars))\n) # ['b', 'a', 'c'] 比如你需要监听一个队列，处理接收到的消息，但每一条消息都有一个编号，要保证具有相同编号的消息只能被处理一次，要怎么做呢？ 显然集合此时就派上用场了，我们可以创建一个集合，每来一条消息，就检测它的编号是否在集合中。如果存在，则说明消息已经被处理过了，忽略掉；如果不存在，说明消息还没有被处理，那么就将它的编号添加到集合中，然后处理消息。 2）判断某个序列是否包含指定的多个元素 data = [\"S\", \"A\", \"T\", \"O\", \"R\", \"I\"] # 现在要判断 data 是否包含 \"T\"、\"R\" 和 \"I\"\n# 如果使用列表的话\nprint( \"T\" in data and \"R\" in data and \"I\" in data\n) # True # 显然使用列表比较麻烦，并且效率也不高，于是我们可以使用集合\nprint( set(data) >= {\"T\", \"R\", \"I\"}\n) # True 同理，基于此方式，我们也可以检测一个字典是否包含指定的多个 key。 data = { \"name\": \"satori\", \"age\": 17, \"gender\": \"female\"\n} # 判断字典是否包含 name、age、gender 三个 key\nprint( data.keys() >= {\"name\", \"age\", \"gender\"}\n) # True # 字典的 keys 方法会返回一个 dict_keys 对象\n# 该对象具备集合的性质，可以直接和集合进行运算 显然对于这种需求，有了集合就方便多了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的使用场景","id":"204","title":"集合的使用场景"},"205":{"body":"然后我们来罗列一下集合支持的 API，在使用集合的时候要做到心中有数。 # 如果是创建一个空集合，那么要使用 set()\n# 写成 {} 的话，解释器会认为这是一个空字典\ns = {1, 2, 3} # 添加元素，时间复杂度是 O(1)\ns.add(4)\nprint(s) # {1, 2, 3, 4} # 删除指定的元素，如果元素不存在，会抛出 KeyError\n# 时间复杂度为 O(1)\ns.remove(2)\nprint(s) # {1, 3, 4} # 删除指定的元素，如果元素不存在则什么也不做\n# 时间复杂度为 O(1)\ns.discard(666)\nprint(s) # {1, 3, 4} # 随机弹出一个元素并返回，如果集合为空，会抛出 KeyError\n# 时间复杂度为 O(1)\nprint(s.pop()) # 1\nprint(s) # {3, 4} # 清空一个集合\ns.clear()\nprint(s) # set() # 还有一些 API，但我们更推荐使用操作符的方式\n# 两个集合取交集\nprint({1, 2} & {2, 3}) # {2} # 两个集合取并集\nprint({1, 2} | {2, 3}) # {1, 2, 3} # 两个集合取差集\n# s1 - s2，返回在 s1、但不在 s2 当中的元素\nprint({1, 2, 3} - {2, 3, 4}) # {1} # 两个集合取对称差集\n# s1 ^ s2，返回既不在 s1、也不在 s2 当中的元素\nprint({1, 2, 3} ^ {2, 3, 4}) # {1, 4} # 判断两个集合是否相等，也就是内部的元素是否完全一致\n# 顺序无所谓，只比较元素是否全部相同\nprint({1, 2, 3} == {3, 2, 1}) # True\nprint({1, 2, 3} == {1, 2, 4}) # False # 判断一个集合是否包含另一个集合的所有元素\n# 假设有两个集合 s1 和 s2：\n# 如果 s1 的元素都在 s2 中，那么 s2 >= s1；\n# 如果 s2 的元素都在 s1 中，那么 s1 >= s2；\n# 如果 s1 和元素和 s2 全部相同，那么 s1 == s2；\nprint({1, 2, 3} > {1, 2}) # True\nprint({1, 2, 3} >= {1, 2, 3}) # True 以上就是集合支持的一些 API，还是很简单的。","breadcrumbs":"48. 解密集合的实现原理 » 集合的 API","id":"205","title":"集合的 API"},"206":{"body":"集合和字典的内部都使用了哈希表，但字典的哈希表采用两个数组实现，而集合的哈希表采用一个数组实现。因此对于集合来说，这个数组不仅要存储 entry，并且映射出的索引也是该数组的索引。 下面看一下集合的底层结构长什么样子。 // Include/setobject.h typedef struct { // 定长对象的头部信息，但集合显然是一个变长对象 // 所以和字典一样，肯定有其它字段充当 ob_size PyObject_HEAD // Active 态的 entry 数量加上 Dummy 态的 entry 数量 // 一个 entry 就是哈希表里的一个元素，类型为 setentry // 因此在集合里面，一个 entry 就是一个 setentry 结构体实例 // 当删除集合的 entry 时，也必须是伪删除，因为要保证探测链不断裂 // 如果 entry 被伪删除了，那么它便处于 Dummy 态 Py_ssize_t fill; // Active 态的 entry 数量，显然这个 used 充当了 ob_size，也就是集合的元素个数 Py_ssize_t used; // 在看字典源码的时候，我们也见到了 mask，它用于和哈希值进行按位与、计算索引 // 并且这个 mask 等于哈希表的容量减 1，为什么呢？ // 假设哈希值等于 v，哈希表容量是 n，那么通过 v 对 n 取模即可得到一个位于 0 到 n-1 之间的数 // 然而取模运算的效率不高，应该使用 v&(n-1)，它的作用等价于 v%n，并且速度更快 // 但是注意，只有在 n 为 2 的幂次方的时候，v&(n-1) 和 v%n 才是完全等价的 // 所以哈希表的容量要求是 2 的幂次方，就是为了将取模运算优化成按位与运算 Py_ssize_t mask; // 指向 setentry 数组首元素的指针 // 这个 setentry 数组可以是下面的 smalltable，也可以是单独申请的一块内存 setentry *table; // 集合的哈希值，只适用于不可变集合 Py_hash_t hash; // 用于 pop 方法 Py_ssize_t finger; // 一个 setentry 类型的数组，集合的元素就存在里面，但记得我们前面说过 // 变长对象的内部不会存储具体的元素，而是会存储一个指针，该指针指向的内存区域才是用来存储具体元素的 // 这样当扩容的时候，只需要让指针指向新的内存区域即可，从而方便维护 // 没错，对于集合而言，只有在容量不超过 8 的时候，元素才会存在里面 // 而一旦超过了 8，那么会使用 malloc 单独申请内存 setentry smalltable[PySet_MINSIZE]; // 弱引用列表，不做深入讨论 PyObject *weakreflist;\n} PySetObject; 有了字典的经验，再看集合会简单很多。然后是 setentry，用于承载集合内的元素，那么它的结构长什么样呢？相信你能够猜到。 // Include/setobject.h typedef struct { PyObject *key; Py_hash_t hash;\n} setentry; 相比字典少了一个 value，这是显而易见的。 因此集合的结构很清晰了，假设有一个集合 {3.14, \"abc\", 666}，那么它的结构如下： 由于集合里面只有三个元素，所以它们都会存在 smalltable 数组里面，我们通过 ctypes 来证明这一点。 from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {3.14, \"abc\", 666}\n# 先来打印一下哈希值\nprint('hash(3.14) =', hash(3.14))\nprint('hash(\"abc\") =', hash(\"abc\"))\nprint('hash(666) =', hash(666))\n\"\"\"\nhash(3.14) = 322818021289917443\nhash(\"abc\") = 2548892134347232650\nhash(666) = 666\n\"\"\" # 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 0\n2 666\n3 322818021289917443\n4 0\n5 0\n6 2548892134347232650\n7 0\n\"\"\" 根据输出的哈希值我们可以断定，这三个元素确实存在了 smalltable 数组里面，并且 666 存在了数组索引为 2 的位置、3.14 存在了数组索引为 3 的位置、\"abc\" 存在了数组索引为 6 的位置。 当然，由于哈希值是随机的，所以每次执行之后打印的结果都可能不一样，但是整数除外，它的哈希值就是它本身。既然哈希值不一样，那么每次映射出的索引也可能不同，但总之这三个元素是存在 smalltable 数组里面的。 然后我们再考察一下其它字段： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\n# 集合里面有 3 个元素，所以 fill 和 used 都是 3\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 3 # 将集合元素全部删除\n# 这里不能用 s.clear()，原因一会儿说\nfor _ in range(len(s)): s.pop() # 我们知道哈希表在删除元素的时候是伪删除\n# 所以 fill 不变，但是 used 每次会减 1\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 0 fill 字段维护的是 Active 态的 entry 数量加上 Dummy 态的 entry 数量，所以删除元素时它的大小是不变的。但 used 字段的值每次会减 1，因为它维护的是 Active 态的 entry 的数量。所以在不涉及元素的删除时，这两者的大小是相等的。 另外我们说上面不能用 s.clear()，因为该方法表示清空集合，此时会重置为初始状态，然后 fill 和 used 都会是 0，这样就观察不到想要的现象了。 删除集合所有元素之后，我们再往里面添加元素，看看是什么效果： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\nfor _ in range(len(s)): s.pop() # 添加一个元素\ns.add(0)\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 1 多次执行的话，会发现打印的结果可能是 3、1，也有可能是 4、1。至于原因，有了字典的经验，相信你肯定能猜到。 首先添加元素之后，used 肯定为 1。至于 fill，如果添加元素的时候，正好撞上了一个 Dummy 态的 entry，那么将其替换掉，此时 fill 不变，仍然是 3。但如果没有撞上 Dummy 态的 entry，而是添加在了新的位置，那么 fill 就是 4。 for i in range(1, 10): s.add(i)\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 10\ns.pop()\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 9 在之前代码的基础上，继续添加 9 个元素，然后 used 变成了 10，这很好理解，因为此时集合有 10 个元素。但 fill 也是 10，这是为什么？很简单，因为哈希表扩容了，扩容时会删除 Dummy 态的 entry，所以 fill 和 used 是相等的。同理，如果再继续 pop，那么 fill 和 used 就又变得不相等了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的底层结构","id":"206","title":"集合的底层结构"},"207":{"body":"集合的结构我们已经清楚了，再来看看它的初始化过程。我们调用类 set，传入一个可迭代对象，便可创建一个集合，这个过程是怎样的呢？ // Objects/setobject.c\nPyObject *\nPySet_New(PyObject *iterable)\n{ return make_new_set(&PySet_Type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为 PySetObject 申请内存，初始容量为 8 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 对字段做初始化 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; // 哈希表容量为 8 时，元素会存在 smalltable 里面 // 因此直接将 smalltable 赋值给 table so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 遍历 iterable，将迭代出的元素添加到集合中 // 关于这个函数，我们之后再介绍 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} 可以看到，集合的创建过程非常简单。","breadcrumbs":"48. 解密集合的实现原理 » 集合的创建","id":"207","title":"集合的创建"},"208":{"body":"字典和集合都是采用哈希表实现的，但字典的哈希表使用了两个数组，而集合的哈希表使用了一个数组，我们对比一下两者的差异。 假设有一个字典和一个集合，字典包含三个键值对，分别是 \"a\": 1、\"b\": 2、\"c\": 3，集合包含三个元素，分别是 \"a\"、\"b\"、\"c\"，然后映射出的索引分别是 2、5、3。 注：为了方便，这里的图画得没有那么严谨。比如集合的哈希表，里面的元素直接用字符串代替了，但其实它存储的是 setentry entry，而 entry 的 key 字段指向的才是字符串。当然这里我们心里清楚就好。 在介绍字典的时候我们说过，早期的字典内部的哈希表也是使用一个数组实现，除了 entry 会多存储一个 value 之外，其它和当前的集合是类似的。 但如果只使用一个数组实现，会导致内存浪费严重，因为哈希表必须要保证一定的稀疏性。所以后续字典内部的哈希表采用两个数组实现，将存储键值对的数组的长度压缩到原来的 2/3，至于映射出的索引则由另一个数组（哈希索引数组）来承载。虽然引入新的数组会带来额外的内存开销（假设大小为 m 字节），但存储键值对的数组不用再浪费 1/3 的空间（假设大小为 n 字节），只要 m 小于 n，那么使用两个数组就会更加节省内存。而在介绍字典的时候我们也看到了，m 是远小于 n 的。 那么问题来了，为什么集合不使用两个数组呢？很简单，因为使用一个数组实现哈希表会更简单，虽然也更加浪费内存。而集合和字典在哈希表的实现上之所以区别对待，还是使用频率的问题，解释器内部极度依赖字典，比如全局变量就是使用字典存储的。 可以说字典的效率高度影响着整个解释器的效率，字典的内存大小高度影响着解释器的内存占用。因此 Python 除了优化字典的搜索性能之外，还要尽可能地减少字典的内存大小。所以字典搞出了分离表、结合表，这一切操作都是为了将字典的内存占用降到最低。 至于集合，解释器对它的依赖就很小了，所以内部的哈希表，只采用了一个数组实现。虽然会有内存浪费，但无伤大雅。 好，回到上面的例子，如果将字典的键值对 \"b\": 2 和集合的元素 \"b\" 删掉，那么它们的结构会发生什么变化呢？ \"b\" 映射出的索引为 5，因此对于字典来说，会将索引为 5 的哈希槽存储的值设置为 dummy。然后是键值对数组，会将指定的 entry 的 me_key 和 me_value 字段全部设置为 NULL，相当于回归到了初始状态。 需要注意的是，数组一旦申请，那么 entry 的空间就已经有了，只是 me_key 和 me_value 字段均为 NULL。而所谓添加键值对，本质上也是修改指定 entry 的 me_key 和 me_value 字段。 对于集合来说，它只有一个数组，这个数组不仅要存储键值对，它的索引还表示 key 映射出的索引，当然这里的 key 指的就是集合的元素。\"b\" 映射出的索引为 5，所以将数组中索引为 5 的 entry->key 设置为 dummy。 但要注意的是，字典的 dummy 是一个整数，值为 -2（DKIX_DUMMY），因为哈希索引数组存储的是键值对数组的索引，显然这是一个整数。然后 key 映射出的索引是哈希索引数组的索引，如果对应的哈希槽存储的值是 -2，说明当前搜索的 key 对应的 entry 被删除了，应该继续向后搜索。 而集合的 dummy 是一个结构体指针，定义如下： // Objects/setobject.c\nstatic PyObject _dummy_struct;\n#define dummy (&_dummy_struct) 因为集合内部的哈希表只使用了一个数组，该数组存储的是 setentry。如果在查找的时候，发现对应的 entry 的 key 等于 dummy，就知道该 entry 被删除了，应该继续向后搜索。 好，继续回到上面的例子，假设这时候再给字典添加一个键值对 \"d\": 4，给集合添加一个元素 \"d\"，而字符串 \"d\" 映射出的索引也是 5，那么结构是怎样的呢？ 对于字典来说，键值对始终按照先来后到的顺序添加在键值对数组中，然后将它在键值对数组中的索引保存在指定的哈希槽中。由于索引为 5 的哈希槽保存的是 -2，处于 Dummy 态，因此直接将它设置为 3。 同理对于集合来说也是类似的。数组索引为 5 的位置保存的值等于 dummy，处于 Dummy 态，说明该元素被删除了，那么直接替换掉。因此整个过程的逻辑很简单：由于索引会存在冲突，所以元素删除之后，需要写入一个特殊的墓碑值，也就是这里的 dummy，因为要保证探测链不断裂。但如果集合后续添加元素时，正好撞上了一个 Dummy 态的 entry，那么会直接替换掉。 所以不论是字典还是集合，只要处于 Dummy 态，都可以替换掉。因为 Dummy 态存在的目的就是为了保证探测链不断裂，而替换之后探测链依旧是完整的。","breadcrumbs":"48. 解密集合的实现原理 » 字典和集合的哈希表的差异","id":"208","title":"字典和集合的哈希表的差异"},"209":{"body":"以上我们就剖析了集合的底层结构以及它的创建过程，不难发现集合的实现比字典要简单很多，并且集合没有自己的缓存池。 下一篇文章来介绍集合的相关操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"48. 解密集合的实现原理 » 小结","id":"209","title":"小结"},"21":{"body":"type 和 object 两者的关系估计会让很多人感到困惑，我们说 type 站在类型金字塔的顶端，任何对象按照类型追根溯源，最终得到的都是 type。而 object 站在继承金字塔的顶端，任何类型对象按照继承关系追根溯源，最终得到的都是 object。 因此我们可以得出以下结论： type 的父类是 object object 的类型是 type 验证一下： print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 打印结果说明结论正确，但这就奇怪了，type 的父类是 object，而 object 的类型又是 type，那么问题来了，是先有 type 还是先有 object 呢？带着这些疑问，开始下面的内容。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 楔子","id":"21","title":"楔子"},"210":{"body":"本篇文章来聊一聊集合支持的操作，比如元素的添加、删除，以及集合的扩容等等。并且集合还支持交集、并集、差集等运算，它们又是如何实现的呢？下面就一起来看一看。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 楔子","id":"210","title":"楔子"},"211":{"body":"调用 add 方法可以向集合添加一个元素，在底层会执行 set_add 函数。 // Objects/setobject.c\nstatic PyObject *\nset_add(PySetObject *so, PyObject *key)\n{ // 调用了 set_add_key 函数 if (set_add_key(so, key)) return NULL; // 返回 None Py_RETURN_NONE;\n} static int\nset_add_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值，由于字符串内部会缓存自身的哈希值，因此需要判断一下 // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1（尚未计算过） // 那么计算哈希值，但如果计算之后的结果是 -1，说明对象不支持哈希 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_add_entry return set_add_entry(so, key, hash);\n} 假设有一个集合 so，那么 so.add(\"abc\") 最终等价于 set_add_entry(so, \"abc\", hash(\"abc\"))，所以核心逻辑位于 set_add_entry 里面，看一下它的实现，代码比较长。 // Objects/setobject.c\nstatic int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *freeslot; setentry *entry; size_t perturb; size_t mask; size_t i; size_t j; int cmp; // 增加 key 的引用计数，当然这里的 key 指的就是集合的元素 Py_INCREF(key); restart: // mask 等于哈希表的容量减 1 mask = so->mask; // 和字典一样，让 hash & mask 计算出一个索引 i = (size_t)hash & mask; // 获取对应的 entry，里面包含了元素 key 和哈希值 // 如果 key == NULL，说明该位置还没有存储元素 // 此时就找到了合适的位置，跳转到 found_unused 标签 entry = &so->table[i]; if (entry->key == NULL) goto found_unused; freeslot = NULL; // perturb 初始等于哈希值 perturb = hash; while (1) { // 到这里说明指定的位置已经存储了元素，那么判断哈希值是否相同 // 如果哈希值不同，那么 key 一定不相同 // 如果哈希值相同，那么 key 不一定相同 if (entry->hash == hash) { // 所以当哈希值相等时，还要比较新添加的 key 和已存在的 key 是否相同 PyObject *startkey = entry->key; assert(startkey != dummy); 、// 这里的 startkey 和 key 都是 C 的变量，它们都是指针 // 如果两者相等，说明指向的是同一个对象，那么直接判定为相等，于是跳转到 found_active 标签 if (startkey == key) // 相当于 Python 的 is goto found_active; // 如果 startkey 和 key 不等，说明指向的不是同一个对象 // 那么比较值是否相等，相当于 Python 的 == // 这里是针对字符串的一个快分支 if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); // 如果 key 不是字符串，则执行通用比较逻辑 cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); // cmp > 0，说明结果为真，即两个 key 的值相等 // 跳转到 found_active 标签 if (cmp > 0) goto found_active; // cmp < 0 表示执行比较操作时出现错误，基本不会发生 if (cmp < 0) goto comparison_error; // 到这里说明两个 key 虽然映射出的索引是一样的，但它们的值不相等 // 那么要怎么办呢？显然要看下一个 entry 是否可用 // 然后下面这三行代码估计让人有些费解，所做的事情如下 // 如果在查询的过程中，哈希表扩容了，或者 key 发生了改变，那么跳转到 restart 标签重新执行 // 但因为 GIL 的存在，实际不会发生 if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } /* 如果是 Unused 态的 entry，那么 * entry->key == NULL * entry->hash == 0 * * 如果是 Dummy 态的 entry，那么 * entry->key == dummy * entry->hash == -1 * * 如果是 Active 态的 entry，那么 * entry->key == some key * entry->hash == some hash */ // 说明 entry 处于 dummy 态，将它赋值给 freeslot else if (entry->hash == -1) freeslot = entry; // 关于这一步是做什么的，一会儿解释 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // 到这里说明 (&so->table[i])->key 和添加的 key 不相等，即出现了索引冲突 // 那么要改变规则，重新映射，直到映射出一个可用的位置 perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) goto found_unused_or_dummy; } found_unused_or_dummy: // 如果 freeslot == NULL，说明没有撞上 Dummy 态的 entry // 跳转到 found_unused 标签 if (freeslot == NULL) goto found_unused; // 否则说明撞上了 Dummy 态的 entry // 集合的长度加 1，或者说 Active 态的 entry 个数加 1 so->used++; // 更新 key 和 hash freeslot->key = key; freeslot->hash = hash; return 0; found_unused: // 执行到这里，说明找到了新的可用位置 // 那么不光 used 要加 1，fill 也要加 1 so->fill++; so->used++; // 更新 key 和 hash entry->key = key; entry->hash = hash; // 如果哈希表的 entry 的个数（Active 态 + Dummy 态）没超过 mask * 3 / 5 // 那么目前的容量是合理的，直接返回 if ((size_t)so->fill*5 < mask*3) return 0; // 否则进行扩容，因为扩容的时候会丢弃 Dummy 的 entry // 所以扩容之后的容量取决于 used，而不是 fill // 如果 used 大于 50000，那么 2 倍扩容，否则 4 倍扩容 return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4); found_active: // 执行到这里，说明添加的元素已经存在了 // 那么减少 key 的引用计数，然后返回 Py_DECREF(key); return 0; comparison_error: // 执行比较操作时出现错误，应该抛出异常，但这一步基本不会发生 Py_DECREF(key); return -1;\n} 所以整个过程和字典是类似的，依旧是将哈希值和 mask 按位与，得到索引，通过索引找到对应的 entry。接下来对 entry 分情况讨论。 如果 entry->key == NULL。 说明找到了可用的 entry，那么直接跳转到 found_unused 标签，然后修改 entry 的 key 和 hash 字段，这样新元素就添加成功了。 如果 entry->hash == hash。 说明找到的 entry 处于 Active 态，那么比较两个 key 是否相等。如果相等，证明添加的元素已存在，则不插入，直接减少引用计数，因为不是字典，不存在更新一说。但如果两个 key 不相等，说明出现索引冲突，那么要映射出一个新的索引，并且映射的方式和字典也是一样的。 perturb >>= PERTURB_SHIFT;\ni = (i * 5 + 1 + perturb) & mask; 但字典和集合有一处不同，就是集合这里多了一个 for 循环。 // Objects/setobject.c\n#define LINEAR_PROBES 9 static int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ // ... while (1) { // ... // 当前映射出的索引为 i，如果 i + 9 没有超过 mask，那么循环 9 次 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // ... } // ...\n} 当映射出的索引相同、但 key 不相同时，说明出现了索引冲突，对于字典来说，会立即重新映射，找到一个新的索引。而集合由于只用一个数组存储，可以有更好的做法。我们知道 CPU 是有缓存的，像 L1 Cache 加载数据会一次性加载 64 字节，称为一个 cache line。所以通过索引遍历包含 16 个 int32 的数组，每次 i++ 和每次 i += 4 的耗时是差不多的。 对于集合来说，因为映射出的索引是随机的，使得对应的 entry 可能不在 cache 中，从而导致 CPU 下一次要重新读取。所以 Python 引入了 LINEAR_PROBES，从当前的 entry 开始，向后查找 9 个 entry。如果还找不到可用位置，然后才重新计算，从而提高 cache 的稳定性。 如果 entry->hash == -1，或者说 entry->key == dummy。 说明撞上了一个 Dummy 态的 entry，但估计有人又注意到了一个问题。 就是在发现 Dummy 态的 entry 之后，为啥没有立即跳转到 found_unused_or_dummy 标签，而是要继续循环呢？ 很简单，我们假设在发现 Dummy 态的 entry 之后立即跳转，看看会有什么后果。首先向集合添加一个元素 x，再添加一个元素 y，但 y 和 x 映射出的索引相同，那么在添加 y 的时候，会形成一条探测链，对应的元素就是 x->y。然后再将 x 删除，那么 x->y 就变成了 dummy->y。这时候如果再重新添加一个元素 y，那么肯定会撞上 Dummy 态的 entry，于是 dummy->y 就变成了 y->y。 所以当发现 Dummy 态的 entry 之后，如果立即跳转，就会无法消除集合的重复元素。因此正确的做法是先用变量保存起来，这里赋值给了 freeslot，然后继续查找。如果找到了相同的元素，那么就不添加了，因为集合中的元素是唯一的。但如果最后找到的 entry 的 key 为空，说明元素不存在，此时才能跳转到 found_unused_or_dummy 标签，然后对 freeslot 进行判断。如果不为空，说明撞上了 Dummy 态的 entry，那么直接复用该 entry 即可。 以上就是集合添加元素的过程，当然如果找到的是 Unused 态的 entry，还要判断容量的问题。如果 Active 态 + Dummy 态的 entry 个数不小于 3/5*mask，那么扩容，扩容的规则是判断 Active 态的 entry 个数是否大于 50000，是的话就 2 倍扩容，否则 4 倍扩容；","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » add 方法：添加元素","id":"211","title":"add 方法：添加元素"},"212":{"body":"调用 pop 方法，可以从集合中弹出一个元素，在底层会执行 set_pop 方法。 // Objects/setobject.c static PyObject *\nset_pop(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ // so->table 是指向 entry 数组首元素的指针 // so->finger 是做什么的，稍后解释，总之它是一个整数 // so->mask 等于 entry 数组的长度减 1，用于将取模运算优化成按位与运算 // 因此 so->finger & so->mask 会得到一个 0 ~ mask 之间的整数，我们记为 n // 显然这里的变量 entry 会指向 entry 数组中索引 n 的元素 setentry *entry = so->table + (so->finger & so->mask); // 变量 limit 则指向 entry 数组中最后一个元素（索引为 mask） setentry *limit = so->table + so->mask; PyObject *key; // 如果集合长度为 0，那么 pop 方法会抛出 KeyError if (so->used == 0) { PyErr_SetString(PyExc_KeyError, \"pop from an empty set\"); return NULL; } // entry 有三种状态，但显然弹出的 entry 一定是 Active 态 // 所以如果 entry 处于 Unused 或 Dummy 态，直接下一轮循环 while (entry->key == NULL || entry->key==dummy) { entry++; // 我们记 so->finger & so->mask 的结果为 n // 所以相当于从 entry 数组中索引为 n 的位置开始遍历 // 如果遍历到最后一个位置，也没找到 Active 态的 entry，那么从头开始遍历 if (entry > limit) entry = so->table; // 让变量 entry 指向 entry 数组的首元素 // 所以不难发现，整个过程是先遍历 entry 数组中 [n: limit] 的部分 // 如果没有找到 Active 态 entry，那么将 entry 重置为 so->table，从头开始遍历 // 因为执行到这里，说明 so->used 大于 0，即集合的长度大于 0 // 那么当 entry > limit 时，在 entry 数组 [0: n] 的部分，一定存在 Active 态的 entry } // pop 方法会返回弹出的元素，所以获取 entry->key key = entry->key; // 元素被弹出了，对应的 entry 要进行伪删除，所谓的伪删除就是设置一个特殊的墓碑值 // 所以将 entry->key 设置为 dummy，将 entry->hash 设置为 -1 entry->key = dummy; entry->hash = -1; // 集合的长度减 1 so->used--; // 将 finger 更新为被删除的 entry 在 entry 数组中的索引加 1 so->finger = entry - so->table + 1; /* next place to start */ return key;\n} 所以删除的过程还是很简单的，如果不考虑 finger 字段，你就可以简单理解为遍历整个 entry 数组，找到 Active 态的 entry，然后删除即可。只是这么做会导致每次 pop 时，都要重头开始遍历数组。 而当引入了 finger 字段之后，由于该字段初始为 0，所以第一次 pop 时，会从数组的头部开始遍历。假设删除的是数组中索引为 n 的 entry，那么删除之后 finger 字段会被赋值为 n + 1，那么下一次 pop 就会从数组中索引为 n + 1 的 entry 开始遍历。 我们通过 ctypes 来验证这一点： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {11, 22, 33, 44}\n# 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\n# 对于整数来说，它的哈希值等于自身\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 33\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# finger 初始为 0，因此在 pop 元素的时候会从头开始遍历数组\n# 找到第一个 Active 态的 entry\nprint(py_set_obj.finger)\n\"\"\"\n0\n\"\"\" # 显然第一次 pop 出的元素是 33\nprint(s.pop())\n\"\"\"\n33\n\"\"\"\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 -1\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# 因为被伪删除了\n# 所以索引为 1 的 entry->key 会被设置为 NULL，entry->hash 被设置为 -1\n# 至于 finger 则等于 1 + 1，下一次 pop 时，会从索引为 2 的位置开始遍历\nprint(py_set_obj.finger)\n\"\"\"\n2\n\"\"\" # 那么同理，再次 pop 的时候，会弹出 11，然后 finger 变为 3 + 1 = 4\nprint(s.pop())\n\"\"\"\n11\n\"\"\"\nprint(py_set_obj.finger)\n\"\"\"\n4\n\"\"\" 以上就是 finger 字段的作用，它避免了每次都要从头遍历 entry 数组。从这里也不难发现，当一个集合不断执行 pop 方法，将所有元素依次弹出时，这些元素的顺序和直接遍历 entry 数组拿到的元素的顺序是一致的。 item1 = 22333\nitem2 = 177\nitem3 = 520\nitem4 = 10086\n# 将它们映射成索引，由于是 4 个元素，因此哈希表容量为 8\nindex1 = item1 & 7\nindex2 = item2 & 7\nindex3 = item3 & 7\nindex4 = item4 & 7\nprint(index1, index2, index3, index4)\n\"\"\"\n5 1 0 6\n\"\"\"\n# 所以如果将 item1、item2、item3、item4 放到集合中\n# 不管怎么排列，最终都是下面这个结果\n# item3 会位于 entry 数组中索引为 0 的位置\n# item2 会位于 entry 数组中索引为 1 的位置\n# item1 会位于 entry 数组中索引为 5 的位置\n# item4 会位于 entry 数组中索引为 6 的位置 # 所以不管是弹出元素，还是遍历元素，亦或是直接打印集合\n# 元素顺序一定是 item3、item2、item1、item4\ns1 = {item1, item2, item3, item4}\ns2 = {item2, item1, item4, item3}\ns3 = {item3, item1, item2, item4}\ns4 = {item4, item3, item2, item1}\nprint(s1) # {520, 177, 22333, 10086}\nprint(s2) # {520, 177, 22333, 10086}\nprint(s3) # {520, 177, 22333, 10086}\nprint(s4) # {520, 177, 22333, 10086}\nprint( item3, item2, item1, item4\n) # 520 177 22333 10086 怎么样，是不是对集合又有了更深刻的认识了呢？","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » pop 方法：弹出元素","id":"212","title":"pop 方法：弹出元素"},"213":{"body":"remove 方法可以接收参数，删除集合中指定的元素。除了 remove，还有一个 discard 方法，这两个方法的作用一模一样，都是用来删除指定元素。区别就是当删除的元素不存在时，remove 方法会抛出 KeyError，而 discard 方法不会。 remove 方法在底层对应 set_remove 函数，discard 方法在底层对应 set_discard 函数，而 set_remove 函数只比 set_discard 函数多了一个 if 判断，我们来看一下。 以上是 set_remove 函数，注意图中绿色方框的部分，如果要删除的元素不存在，那么 rv 会等于 DISCARD_NOTFOUND，于是抛出 KeyError。 如果将绿色方框里的 if 逻辑删掉，得到的就是 set_discard 函数的源码。所以这两个函数做的事情是一样的，区别就是 set_remove 会多做一层检测，当删除的元素不存在时，set_remove 会主动抛出一个 KeyError，而 set_discard 函数则什么也不做。 所以这里我们只看 set_remove 函数即可。 // Objects/setobject.c #define DISCARD_NOTFOUND 0\n#define DISCARD_FOUND 1 static PyObject *\nset_remove(PySetObject *so, PyObject *key)\n{ // 要删除的 key，或者说元素 // 当然啦，从 C 的层面来看，删除 key 其实就是删除数组中该 key 对应的 entry // 只不过这个删除是伪删除，即写入一个特殊的墓碑值 PyObject *tmpkey; int rv; // rv 表示删除结果，显然删除逻辑由 set_discard_key 函数实现 // 如果 rv < 0，表示删除元素时出现错误，比如传入了一个不可哈希的对象 // 如果 rv == 0，表示要删除的元素在集合中不存在 // 如果 rv == 1，表示成功将元素从集合中删除 rv = set_discard_key(so, key); if (rv < 0) { // 当传入一个不可哈希对象时，会抛出 TypeError // 我们知道集合也是不可哈希的，但如果要删除的 key 是集合类型 // 那么解释器会额外做一个兜底操作，我们一会儿通过 Python 代码演示 if (!PySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError)) return NULL; // 将回溯栈里的异常清空 PyErr_Clear(); // 基于集合里的元素创建不可变集合 tmpkey = make_new_set(&PyFrozenSet_Type, key); if (tmpkey == NULL) return NULL; // 然后尝试删除这个不可变集合，如果还删除失败，则报错 rv = set_discard_key(so, tmpkey); Py_DECREF(tmpkey); if (rv < 0) return NULL; } // 如果 rv == DISCARD_NOTFOUND，表示要删除的元素不存在 if (rv == DISCARD_NOTFOUND) { _PyErr_SetKeyError(key); // 抛出 KeyError return NULL; } Py_RETURN_NONE;\n} 我们看到当元素删除失败时，如果 key 是集合类型，那么解释器会做一个兜底操作，这是什么意思呢？我们演示一遍。 try: s = {[1, 2, 3]} # 列表不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" try: s = {{1, 2, 3}} # 同样，集合也不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'set'\n\"\"\" # 当我们尝试 remove 列表时，依旧会抛出相同的错误\ns = {1, 2, 3}\ntry: s.remove([])\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" # 但 remove 一个集合就不同了\ns = { frozenset({1, 2, 3}), frozenset({4, 5, 6}),\n}\n# 不可变集合是可哈希对象，因此它可以放在集合中，也可以被删除\ns.remove(frozenset({1, 2, 3}))\n# 但删除可变集合理论上应该和删除列表一样，抛出 TypeError: unhashable type: 'set'\n# 而事实上异常也确实产生了，保存在回溯栈中，但是从源码中我们看到，解释器会多做一个检测\n# 如果删除的 key 是集合类型，并且栈里的异常是 TypeError，那么将异常清空\n# 然后基于集合创建不可变集合，并尝试删除这个不可变集合\ns.remove({4, 5, 6})\n# 所以这里 s.remove({4, 5, 6}) 等价于 s.remove(frozenset({4, 5, 6}))\nprint(s)\n\"\"\"\nset()\n\"\"\"\n# 我们看到 s 里面的两个不可变集合被删除了 好，我们回到 set_remove 函数，它在删除元素时会调用 set_discard_key 函数，显然删除指定元素的核心逻辑位于此函数中，我们看一下它做了什么。 // Objects/setobject.c static int\nset_discard_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_discard_entry 函数 // 传入三个参数：集合、要删除的 key、以及 key 的哈希值 return set_discard_entry(so, key, hash);\n} static int\nset_discard_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; PyObject *old_key; // 将 key 映射成索引，并获取该索引对应的 entry 的指针 entry = set_lookkey(so, key, hash); // 因为 entry 数组申请好之后，内部的每个 entry 都拥有一块合法的内存 // 所以指针不可能为 NULL，如果为 NULL，证明内部出问题了 if (entry == NULL) // 基本不会发生 return -1; // 如果 entry->key 为 NULL，证明要删除的 key 不存在，返回 DISCARD_NOTFOUND // 当 set_remove 函数发现返回的是 DISCARD_NOTFOUND，会抛出 KeyError if (entry->key == NULL) return DISCARD_NOTFOUND; // 否则说明 key 存在 old_key = entry->key; // 因为被删除了，所以将 entry->key、entry->hash 设置为 dummy 和 -1 entry->key = dummy; entry->hash = -1; // 集合长度减 1 so->used--; // 减少 key 指向对象的引用计数，因为集合不再持有对它的引用 Py_DECREF(old_key); // 返回 DISCARD_FOUND return DISCARD_FOUND;\n} 以上就是 set_remove 函数删除指定元素的具体细节，逻辑并不复杂。但是里面出现了一个 set_lookkey 函数，它的作用是将哈希值映射成索引，并返回指定的 entry。至于该函数的逻辑也很简单，它和 set_add 函数里面的逻辑是重复的。 static setentry *\nset_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *entry; size_t perturb; size_t mask = so->mask; size_t i = (size_t)hash & mask; /* Unsigned for defined overflow behavior */ size_t j; int cmp; entry = &so->table[i]; if (entry->key == NULL) return entry; perturb = hash; while (1) { if (entry->hash == hash) { PyObject *startkey = entry->key; /* startkey cannot be a dummy because the dummy hash field is -1 */ assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) /* unlikely */ return NULL; if (table != so->table || entry->key != startkey) /* unlikely */ return set_lookkey(so, key, hash); if (cmp > 0) /* likely */ return entry; mask = so->mask; /* help avoid a register spill */ } if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) return entry; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) return NULL; if (table != so->table || entry->key != startkey) return set_lookkey(so, key, hash); if (cmp > 0) return entry; mask = so->mask; } } } perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) return entry; }\n} 显然该函数的逻辑在介绍 set_add 函数的时候就说过了。 如果 entry->key 为空，说明找到了 Unused 态的 entry，即 key 不存在，那么直接将 entry 返回即可。 如果 entry->key 不为空，那么比较 entry->hash 和传入的 hash 是否相等，如果哈希值不相等，那么 key 一定不相等，说明出现了索引冲突。当然啦，如果 entry 处于 Dummy 态，那么哈希值肯定也不相等，但不管哪一种，都要重新映射。 如果哈希值相等，那么比较 key 是否相等，如果 key 相等，说明查找的 key 存在于集合中，那么返回对应的 entry。如果 key 不相等，则重新映射。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » remove 方法：删除指定元素","id":"213","title":"remove 方法：删除指定元素"},"214":{"body":"调用 copy 方法可以拷贝一个集合，在底层会执行 set_copy 方法。 // Objects/setobject.c static PyObject *\nset_copy(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ return make_new_set_basetype(Py_TYPE(so), (PyObject *)so);\n} static PyObject *\nmake_new_set_basetype(PyTypeObject *type, PyObject *iterable)\n{ if (type != &PySet_Type && type != &PyFrozenSet_Type) { if (PyType_IsSubtype(type, &PySet_Type)) type = &PySet_Type; else type = &PyFrozenSet_Type; } return make_new_set(type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为集合申请内存 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 字段初始化，显然刚创建的集合的容量为 8 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 调用 set_update_internal 函数，将可迭代对象的元素添加到集合中 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} static int\nset_update_internal(PySetObject *so, PyObject *other)\n{ // 参数 so 表示集合，other 表示可迭代对象 PyObject *key, *it; // 如果 other 的类型也是集合（或者不可变集合），那么调用 set_merge 函数 if (PyAnySet_Check(other)) return set_merge(so, other); // 否则检测 other 是否为字典 if (PyDict_CheckExact(other)) { PyObject *value; Py_ssize_t pos = 0; Py_hash_t hash; Py_ssize_t dictsize = PyDict_GET_SIZE(other); // 判断 so->fill + dictsize 是否达到了 so->mask 的 3/5 // 如果达到了，那么扩容 if (dictsize < 0) return -1; if ((so->fill + dictsize)*5 >= so->mask*3) { if (set_table_resize(so, (so->used + dictsize)*2) != 0) return -1; } // 遍历字典，将字典的 key 和 hash 包装成 entry，添加到数组中，value 丢弃 // 这里调用的是 set_add_entry 函数，我们介绍集合的 add 方法时说过 while (_PyDict_Next(other, &pos, &key, &value, &hash)) { if (set_add_entry(so, key, hash)) return -1; } return 0; } // 到这里说明 other 不是字典，那么迭代出来的整体就是 key // 基于可迭代对象创建迭代器 it = PyObject_GetIter(other); if (it == NULL) return -1; // 将元素迭代出来 while ((key = PyIter_Next(it)) != NULL) { // 调用 set_add_key 函数，它内部会先计算 key 的哈希值 // 然后调用 set_add_entry 函数，添加元素 if (set_add_key(so, key)) { Py_DECREF(it); Py_DECREF(key); return -1; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) return -1; return 0;\n} 以上就是集合的 copy 方法的底层实现，非常简单。说白了就是先创建一个新的集合，然后调用 set_update_internal 函数将老集合里面的元素拷贝过去。当然啦，该函数可以拷贝任意可迭代对象里的元素，不仅仅是集合。只是当可迭代对象是集合时，会单独调用 set_merge 函数，如果不是集合，那么会直接遍历。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » copy 方法：拷贝一个集合","id":"214","title":"copy 方法：拷贝一个集合"},"215":{"body":"调用 update 方法，可以合并多个可迭代对象，举例说明。 s = {1, 2, 3}\ns.update([4, 5, 6], (7, 8, 9))\nprint(s)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" 相信你已经知道底层是怎么做的了，获取每个可迭代对象，然后调用 set_update_internal 函数即可。那么底层是不是这么做的呢？我们来看一下，update 方法在底层对应 set_update 函数。 // Objects/setobject.c static PyObject *\nset_update(PySetObject *so, PyObject *args)\n{ Py_ssize_t i; for (i=0 ; i<PyTuple_GET_SIZE(args) ; i++) { PyObject *other = PyTuple_GET_ITEM(args, i); if (set_update_internal(so, other)) return NULL; } Py_RETURN_NONE;\n} 跟我们分析的一样，非常简单。 另外集合还有一个 union 方法，功能和 update 方法类似，但它会返回一个新的集合。 s1 = {1, 2, 3}\ns1.update([4, 5, 6], (7, 8, 9))\nprint(s1)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" s2 = {1, 2, 3}\ns2_new = s2.union([4, 5, 6], (7, 8, 9))\nprint(s2)\nprint(s2_new)\n\"\"\"\n{1, 2, 3}\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" update 方法会原地修改，而 union 方法会返回新的集合，不会影响原有的集合。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » update 方法：合并多个可迭代对象","id":"215","title":"update 方法：合并多个可迭代对象"},"216":{"body":"集合还有一些常用的方法，只不过我们更倾向于使用操作符的形式。 s1 & s2：对两个集合做交集运算，返回新的集合，里面包含同时出现在 s1 和 s2 当中的元素； s1 | s2：对两个集合做并集运算，返回新的集合，里面包含出现在 s1 或 s2 当中的元素； s1 - s2：对两个集合做差集运算，返回新的集合，里面包含出现在 s1 当中、但没有出现在 s2 当中的元素； s1 ^ s2：对两个集合做对称差集运算，返回新的集合，里面包含只出现在 s1 当中、或只出现在 s2 当中的元素； s1 == s2：判断两个集合的元素是否完全相同； s1 >= s2：判断 s2 是否是 s1 的子集，如果是，那么 s2 - s1 == {}。 s1 <= s2：判断 s1 是否是 s2 的子集，如果是，那么 s1 - s2 == {}。 s1 > s2：判断 s2 是否是 s1 的真子集； s1 < s2：判断 s1 是否是 s2 的真子集； 注意：在使用这些操作符时，两侧的 s1 和 s2 都要求是集合类型。但如果使用操作符对应的方法，那么则不要求 s2 是集合类型，只要是可迭代对象即可。 # 做交集运算\ns = {\"a\", \"b\", \"c\"}\nprint(s.intersection(\"bcd\"))\n\"\"\"\n{'b', 'c'}\n\"\"\"\n# print(s & \"bcd\") # TypeError 这些方法都非常的有用，可以自己测试一下，加深一遍印象。至于这些方法的底层实现，感兴趣也可以去 Objects/setobject.c 中探索一番，方法都定义在 set_methods 数组中。这里我们就以集合的交集运算为例，看一下实现过程。 // Objects/setobject.c // 判断集合是否包含某个元素\nstatic int\nset_contains_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; // 调用 set_lookkey，返回 entry // 如果 entry->key 不为空，证明元素存在，否则不存在 entry = set_lookkey(so, key, hash); if (entry != NULL) return entry->key != NULL; return -1;\n} // 两个集合做交集运算，返回新的集合\nstatic PyObject *\nset_intersection(PySetObject *so, PyObject *other)\n{ PySetObject *result; PyObject *key, *it, *tmp; Py_hash_t hash; int rv; // 快分支：如果两个集合相等，那么直接把其中一个拷贝一份 if ((PyObject *)so == other) return set_copy(so, NULL); // 否则创建一个新的空集合 result = (PySetObject *)make_new_set_basetype(Py_TYPE(so), NULL); if (result == NULL) return NULL; // 如果 other 是集合 if (PyAnySet_Check(other)) { Py_ssize_t pos = 0; setentry *entry; // 如果 len(other) > len(so)，那么两者交换位置，也就是遍历元素较少的集合 if (PySet_GET_SIZE(other) > PySet_GET_SIZE(so)) { tmp = (PyObject *)so; so = (PySetObject *)other; other = tmp; } // 遍历集合 other while (set_next((PySetObject *)other, &pos, &entry)) { key = entry->key; hash = entry->hash; // 判断 key 是否存在于集合 so 中 rv = set_contains_entry(so, key, hash); if (rv < 0) { Py_DECREF(result); return NULL; } // 如果存在，那么添加到新集合 result 中 if (rv) { if (set_add_entry(result, key, hash)) { Py_DECREF(result); return NULL; } } } return (PyObject *)result; } // 如果 other 不是集合，那么获取它的迭代器 it = PyObject_GetIter(other); if (it == NULL) { Py_DECREF(result); return NULL; } // 直接迭代内部的元素，以下逻辑和上面类似 while ((key = PyIter_Next(it)) != NULL) { hash = PyObject_Hash(key); if (hash == -1) goto error; // 如果 key 在 so 中存在，那么添加到 result 中 rv = set_contains_entry(so, key, hash); if (rv < 0) goto error; if (rv) { if (set_add_entry(result, key, hash)) goto error; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) { Py_DECREF(result); return NULL; } return (PyObject *)result; error: Py_DECREF(it); Py_DECREF(result); Py_DECREF(key); return NULL;\n} 以上就是集合的交集运算，至于其它的运算操作也是类似的，感兴趣可以看一下。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 其它的一些方法","id":"216","title":"其它的一些方法"},"217":{"body":"关于集合相关的内容我们就介绍完了，当然到目前为止，Python 的内置数据结构也基本介绍完了。回顾一下我们介绍了哪些数据结构： 浮点数； 整数； 复数； 布尔值 None； 切片； bytes 对象； bytearray 对象； 字符串； 列表； 元组； 字典； 集合； 以上这些结构都是内置的，当然还有一些数据结构是定义在标准库里面的，我们后面再说。 下一篇文章来介绍迭代器。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 小结","id":"217","title":"小结"},"218":{"body":"只要类型对象实现了 __iter__，那么它的实例对象就被称为可迭代对象（Iterable），比如字符串、元组、列表、字典、集合等等。而整数、浮点数，由于其类型对象没有实现 __iter__，所以它们不是可迭代对象。 from typing import Iterable print( isinstance(\"\", Iterable), isinstance((), Iterable), isinstance([], Iterable), isinstance({}, Iterable), isinstance(set(), Iterable),\n) # True True True True True print( isinstance(0, Iterable), isinstance(0.0, Iterable),\n) # False False 可迭代对象的一大特点是可以被 for 循环遍历，但能被 for 循环遍历的则不一定是可迭代对象。我们举个例子： class A: def __getitem__(self, item): return f\"参数 item: {item}\" a = A()\n# 内部定义了 __getitem__\n# 首先可以让实例对象像字典一样访问属性\nprint(a[\"name\"]) # 参数 item: name\nprint(a[\"satori\"]) # 参数 item: satori # 此外还可以像可迭代对象一样被 for 循环\n# 循环的时候会自动给 item 传值：0 1 2 3 ...\n# 如果内部出现了 StopIteration，循环结束\n# 否则会一直循环下去，这里我们手动 break\nfor idx, val in enumerate(a): print(val) if idx == 5: break\n\"\"\"\n参数 item: 0\n参数 item: 1\n参数 item: 2\n参数 item: 3\n参数 item: 4\n参数 item: 5\n\"\"\" 所以实现了 __getitem__ 的类的实例，也是可以被 for 循环的，但它并不是可迭代对象。 from typing import Iterable\nprint(isinstance(a, Iterable)) # False 总之判断一个对象是否是可迭代对象，就看它的类型对象有没有实现 __iter__。可迭代对象我们知道了，那什么是迭代器呢？很简单，调用可迭代对象的 __iter__ 方法，得到的就是迭代器。","breadcrumbs":"50. 迭代器是怎么实现的？ » 楔子","id":"218","title":"楔子"},"219":{"body":"不同类型的对象，都有自己的迭代器，举个栗子。 data = [1, 2, 3]\n# 底层调用的其实是 list.__iter__(data)\n# 或者说 PyList_Type.tp_iter(data)\nit = data.__iter__()\nprint(it)\n\"\"\"\n<list_iterator object at 0x102c1cf10>\n\"\"\"\nprint(str.__iter__(\"\"))\n\"\"\"\n<str_iterator object at 0x100e623b0>\n\"\"\"\nprint(tuple.__iter__(()))\n\"\"\"\n<tuple_iterator object at 0x100e623b0>\n\"\"\"\n# 不难发现，迭代器的种类非常多\n# 比如 list_iterator、str_iterator、tuple_iterator 等等 迭代器也是可迭代对象，只不过迭代器内部的 __iter__ 返回的还是它本身。当然啦，在创建迭代器的时候，我们更常用内置函数 iter。 data = [1, 2, 3]\n# 等价于 type(data).__iter__(data)\nit = iter(data) 但是 iter 函数还有一个鲜为人知的用法，我们来看一下： val = 0 def foo(): global val val += 1 return val # iter 可以接收一个参数: iter(可迭代对象)\n# iter 也可以接收两个参数: iter(可调用对象, value)\nfor i in iter(foo, 5): print(i)\n\"\"\"\n1\n2\n3\n4\n\"\"\" 进行迭代的时候，会不停地调用可调用对象，直到返回值等于传递的第二个参数 value（在底层被称为哨兵），然后终止迭代。我们看一下 iter 函数的底层实现。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *v; // 内置函数 iter 接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"iter\", nargs, 1, 2)) return NULL; // 如果 nargs 等于 1，那么 args[0] 是可迭代对象 // 如果 nargs 等于 2，那么 args[0] 是可调用对象 v = args[0]; // nargs == 1，说明 v 是可迭代对象 if (nargs == 1) // 调用 PyObject_GetIter 获取对象的迭代器 return PyObject_GetIter(v); // 否则说明 nargs == 2，那么 v 是可调用对象 // 这里进行检测，如果不是，抛出 TypeError if (!PyCallable_Check(v)) { PyErr_SetString(PyExc_TypeError, \"iter(v, w): v must be callable\"); return NULL; } // 获取哨兵 PyObject *sentinel = args[1]; // 一会儿单独解释 return PyCallIter_New(v, sentinel);\n} 以上就是 iter 函数的内部逻辑，既可以接收一个参数，也可以接收两个参数。这里我们只看接收一个可迭代对象的情况，所以核心就在 PyObject_GetIter 函数里面，它是根据可迭代对象生成迭代器的关键，我们来看一下它的逻辑是怎样的？ // Objects/abstract.c\nPyObject *\nPyObject_GetIter(PyObject *o)\n{ // 获取可迭代对象的类型对象，比如 o 是列表，那么 t 就是 list PyTypeObject *t = o->ob_type; // 我们说类型对象定义的操作，决定了实例对象的行为 // 实例对象调用的那些方法都是定义在类型对象里面的 // 还是那句话：obj.func() 等价于 type(obj).func(obj) getiterfunc f; // 所以这里是获取类型对象的 tp_iter 字段 // 也就是 Python 中的 __iter__ f = t->tp_iter; // 如果 f 为 NULL，说明类型对象的内部没有定义 __iter__ // 像 str、tuple、list 等类型对象，它们的 tp_iter 字段都是不为 NULL 的 if (f == NULL) { // 如果 tp_iter 为 NULL，那么解释器会退而求其次 // 检测该类型对象中是否定义了 __getitem__ // 如果定义了，那么直接调用 PySeqIter_New，创建 seqiterobject 对象 // 下面的 PySequence_Check 函数负责检测类型对象是否实现了 __getitem__ // __getitem__ 对应 tp_as_sequence->sq_item if (PySequence_Check(o)) return PySeqIter_New(o); // 走到这里说明该类型对象既没有 __iter__、也没有 __getitem__ // 因此它的实例对象不具备可迭代的性质，于是抛出异常 return type_error(\"'%.200s' object is not iterable\", o); } else { // 否则说明定义了 __iter__ // 调用 o->ob_type->tp_iter(o) 返回对应的迭代器 PyObject *res = (*f)(o); // 但如果返回值 res 不为 NULL、并且还不是迭代器 // 证明 __iter__ 的返回值有问题，于是抛出异常 if (res != NULL && !PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, \"iter() returned non-iterator \" \"of type '%.100s'\", res->ob_type->tp_name); Py_DECREF(res); res = NULL; } // 返回 res return res; }\n} 以上便是 iter 函数的底层实现，还是很简单的。然后是里面的 __getitem__，我们说如果类型对象内部没有定义 __iter__，那么解释器会退而求其次，检测内部是否定义了 __getitem__。 因此以上就是迭代器的创建过程，每个可迭代对象都有自己的迭代器，而迭代器本质上就是对原始数据的一层封装罢了。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的创建","id":"219","title":"迭代器的创建"},"22":{"body":"首先必须要澄清一个事实，类对象的类型是 type，这句话是没有问题的。但如果说类对象都是由 type 创建的，就有些争议了。因为 type 能够创建的是自定义的类，而内置的类在底层是预先定义好的。 # int、tuple、dict 等内置类型\n# 在底层是预先定义好的，以全局变量的形式存在\n# 我们直接就可以拿来用\nprint(int) # <class 'int'>\nprint(tuple) # <class 'tuple'> # 但对于自定义的类，显然就需要在运行时动态创建了\n# 而创建这一过程，就交给 type 来做\nclass Girl: pass 然后 type 也只能对自定义类进行属性上的增删改，内置的类则不行。 class Girl: pass # 给类对象增加一个成员函数\ntype.__setattr__( Girl, \"info\", lambda self: \"name: 古明地觉, age: 17\"\n)\n# 实例化之后就可以调用了\nprint(Girl().info()) # name: 古明地觉, age: 17 # 但内置的类对象，type 是无法修改的\ntry: type.__setattr__(int, \"a\", \"b\")\nexcept TypeError as e: print(e)\n\"\"\"\ncan't set attributes of built-in/extension type 'int'\n\"\"\" 上一篇文章中我们说了，Python 所有的类型对象（包括 type）都是由 PyTypeObject 结构体实例化得到的，只不过结构体字段的值不同，得到的类也不同。并且内置的类型对象在底层是预定义好的，它们在解释器看来是同级别的，不存在谁创建谁。 而每一个对象都有引用计数和类型，然后解释器将这些类对象的类型都设置成了 type，我们举例说明。不过在此之前，需要先说一个宏。 // Include/object.h // _PyObject_EXTRA_INIT 可以忽略掉\n// 我们看到这个宏是用来初始化引用计数和类型的\n#define PyObject_HEAD_INIT(type) \\ { _PyObject_EXTRA_INIT \\ 1, type }, // 负责初始化引用计数、类型和 ob_size\n#define PyVarObject_HEAD_INIT(type, size) \\ { PyObject_HEAD_INIT(type) size }, 下面我们来看几个类型对象。 我们看到所有类型对象的类型都被设置成了 &PyType_Type，也就是 Python 里的 type。所以结论很清晰了，虽然内置的类型对象可以看做是 type 的实例对象，但它却不是由 type 实例化得到的，而是在底层预定义好，并以全局变量的形式静态出现。 所以内置的类型对象之间不存在谁创建谁，它们都是预定义好的，只是在定义的时候，将自身的类型设置成了 type 而已，包括 type 本身（类型还是 type）。这样一来，每一个对象都会有一个类型，从而将面向对象理念贯彻的更加彻底。 print(int.__class__)\nprint(tuple.__class__)\nprint(set.__class__)\nprint(type.__class__)\n\"\"\"\n<class 'type'>\n<class 'type'>\n<class 'type'>\n<class 'type'>\n\"\"\" print( type.__class__.__class__.__class__ is type\n) # True print( type(type(type(type(type(type))))) is type\n) # True 好，说完了这些之后我们来正式考察 type 和 object 的底层实现。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类是由谁创建的","id":"22","title":"类是由谁创建的"},"220":{"body":"由于迭代器的种类非常多，字符串、元组、列表等等，都有自己的迭代器，这里就不一一介绍了。我们就以列表的迭代器为例，看看迭代器在底层的结构是怎么样的。 // Objects/listobject.c // 列表迭代器的类型对象为 <class 'list_iterator'>\n// 但这个类，解释器并没有暴露给我们，所以需要通过 type 获取\n// 然后它的 tp_basicsize 字段为 sizeof(listiterobject)\n// 这就说明列表迭代器在底层由 listiterobject 结构体表示\nPyTypeObject PyListIter_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"list_iterator\", /* tp_name */ sizeof(listiterobject), /* tp_basicsize */ 0, /* tp_itemsize */ // ...\n}; typedef struct { PyObject_HEAD Py_ssize_t it_index; // 指向创建该迭代器的列表 PyListObject *it_seq;\n} listiterobject; 所以迭代器就是基于可迭代对象进行了一层简单的封装，所谓元素迭代本质上还是基于索引，并且每迭代一次，索引就自增 1。一旦出现索引越界，就将 it_seq 设置为 NULL，表示迭代器迭代完毕。 我们实际演示一下： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_size\", c_void_p) ] class ListIterObject(PyObject): _fields_ = [ (\"it_index\", c_ssize_t), (\"it_seq\", POINTER(PyObject)) ] it = iter([1, 2, 3])\nit_obj = ListIterObject.from_address(id(it)) # it_seq 指向列表 [1, 2, 3]，it_index 初始为 0\nprint(it_obj.it_index) # 0\n# 进行迭代\nnext(it)\n# 索引自增 1，此时 it_index 等于 1\nprint(it_obj.it_index) # 1\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 2\nprint(it_obj.it_index) # 2\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 3\nprint(it_obj.it_index) # 3 当 it_index 为 3 的时候，如果再次迭代，那么底层会发现 it_index 已超过最大索引，于是知道迭代器已经迭代完毕了。因此会将 it_seq 设置为 NULL，并抛出 StopIteration。如果是 for 循环，那么会自动捕获此异常，然后停止循环。 所以这就是迭代器，真的没有想象中的那么神秘，甚至在知道它的实现原理之后，还觉得有点 low，因为就是将原始数据包了一层，加了一个索引而已。所谓的迭代仍然是基于索引来做的，并且每迭代一次，索引就自增 1。当索引超出范围时，证明迭代完毕了，于是将 it_seq 字段设置为 NULL，抛出 StopIteration。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的底层结构","id":"220","title":"迭代器的底层结构"},"221":{"body":"迭代器的创建我们知道了，那么它是怎么迭代元素的呢？首先迭代元素可以通过 next 函数，当然它本质上也是调用了对象的 __next__ 方法。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_next(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *it, *res; // 同样接收 1 ~ 2 个参数 // 因为调用 next 函数时，可以传入一个默认值 // 表示当迭代器没有元素可以迭代的时候，会返回指定的默认值 if (!_PyArg_CheckPositional(\"next\", nargs, 1, 2)) return NULL; // 迭代器 it = args[0]; // 类型检测，如果不是迭代器，那么抛出异常 if (!PyIter_Check(it)) { PyErr_Format(PyExc_TypeError, \"'%.200s' object is not an iterator\", it->ob_type->tp_name); return NULL; } // it->ob_type 表示获取类型对象，也就是该迭代器的类型 // 当然具体类型是哪一种并不确定，可能是列表迭代器、元组迭代器、字符串迭代器等等 // 然后再获取 tp_iternext 字段，相当于 __next__ // 拿到函数指针之后，传入迭代器进行调用 res = (*it->ob_type->tp_iternext)(it); // 如果 res 不为 NULL，那么证明迭代到值了，直接返回 if (res != NULL) { return res; } else if (nargs > 1) { // 否则的话，说明没有迭代到值（返回 NULL），而这时候有两种情况 // 1）迭代器已耗尽，2）在迭代过程中出现异常 // 那么判断 nargs 是否大于 1，如果大于 1，说明设置了默认值 PyObject *def = args[1]; // 检测异常是不是迭代完毕时（或者手动 raise）产生的 StopIteration 异常 if (PyErr_Occurred()) { if(!PyErr_ExceptionMatches(PyExc_StopIteration)) // 如果不是，说明程序的逻辑有问题，直接 return NULL，结束执行 // 然后在 Python 里面我们会看到打印到 stderr 中的异常信息 return NULL; // 如果异常是 StopIteration，证明迭代完毕了 // 但我们设置了默认值，那么就应该返回默认值 // 而不应该抛出 StopIteration，于是将异常回溯栈给清空 PyErr_Clear(); } // 增加默认值的引用计数，然后返回 Py_INCREF(def); return def; } else if (PyErr_Occurred()) { // 走到这里说明 res == NULL，并且没有指定默认值 // 那么当发生异常时，将异常直接抛出 return NULL; } else { // 都不是的话，直接抛出 StopIteration PyErr_SetNone(PyExc_StopIteration); return NULL; }\n} 以上就是 next 函数的背后逻辑，实际上还是调用了迭代器的 __next__ 方法。 data = [1, 2, 3]\nit = iter(data)\n# 然后迭代，等价于 next(it)\nprint(type(it).__next__(it)) # 1\nprint(type(it).__next__(it)) # 2\nprint(type(it).__next__(it)) # 3\n# 但是 next 可以指定默认值\n# 如果不指定默认值，或者还是 type(it).__next__(it)\n# 那么就会报错，抛出 StopIteration\nprint(next(it, 666)) # 666 以上就是元素的迭代，由于内置函数 next 还可以指定一个默认值，所以更强大一些。当然在不指定默认值的情况下，next(it) 和 type(it).__next__(it) 最终是殊途同归的。 我们仍以列表的迭代器为例，看看 __next__ 的具体实现。 由于 tp_iternext 字段指向了 listiter_next，证明迭代的时候调用的是这个函数。 // Objects/listobject.c\nstatic PyObject *\nlistiter_next(listiterobject *it)\n{ // 迭代器只是对可迭代对象的一层封装 // 如果是列表的迭代器，那么内部的 it_seq 字段便指向列表 PyListObject *seq; PyObject *item; assert(it != NULL); // 如果 it->it_seq 等于 NULL，说明迭代器已经迭代完毕了 // 从这里也能看出迭代器不能二次循环迭代 seq = it->it_seq; if (seq == NULL) return NULL; assert(PyList_Check(seq)); // 如果 it->it_index 小于列表的长度 if (it->it_index < PyList_GET_SIZE(seq)) { // 那么获取元素 item = PyList_GET_ITEM(seq, it->it_index); // it_index 自增 1 ++it->it_index; // 增加元素的引用计数，并返回 Py_INCREF(item); return item; } // 否则说明 it_index 已经达到了列表的长度 // 再迭代就索引越界了，而对于迭代器来说 // 当 it_index 等于列表长度时，就证明所有元素都迭代完毕了 it->it_seq = NULL; // 将 it_seq 设置为 NULL Py_DECREF(seq); return NULL;\n} 显然这和之前分析的是一样的，以上我们就以列表为例，考察了迭代器的实现原理和元素迭代的具体过程。当然其它对象也有自己的迭代器，有兴趣可以看一看，实现方式都大同小异。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器是怎么迭代元素的","id":"221","title":"迭代器是怎么迭代元素的"},"222":{"body":"前面说了，iter 函数如果接收一个参数，那么这个参数必须是可迭代对象。如果接收两个参数，那么第一个参数要是 callable，第二个参数是哨兵。迭代时会调用 callable，当返回值等于哨兵时，迭代结束，那么它的底层是怎么实现的呢？这里简单补充一下。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // ... PyObject *sentinel = args[1]; // 如果参数个数等于 2，会调用 PyCallIter_New return PyCallIter_New(v, sentinel);\n} // Objects/iterobject.c\ntypedef struct { PyObject_HEAD PyObject *it_callable; PyObject *it_sentinel;\n} calliterobject; PyObject *\nPyCallIter_New(PyObject *callable, PyObject *sentinel)\n{ // iter(callable, value) 会返回一个 <class 'callable_iterator'> 实例 // 在底层由 calliterobject 结构体实现 calliterobject *it; // 为 calliterobject 实例申请内存 it = PyObject_GC_New(calliterobject, &PyCallIter_Type); if (it == NULL) return NULL; // 初始化字段 Py_INCREF(callable); it->it_callable = callable; Py_INCREF(sentinel); it->it_sentinel = sentinel; _PyObject_GC_TRACK(it); return (PyObject *)it;\n} // 再来看看迭代过程\nstatic PyObject *\ncalliter_iternext(calliterobject *it)\n{ PyObject *result; // 如果 it_callable 字段为空，说明迭代结束，不能再次迭代 if (it->it_callable == NULL) { return NULL; } // 调用 it_callable，拿到返回值 result result = _PyObject_CallNoArg(it->it_callable); if (result != NULL) { int ok; // 如果 result 和哨兵相等，那么 ok == 1，否则 ok == 0 ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ); // ok == 0，说明两者不相等，那么返回 result if (ok == 0) { return result; } // ok > 0，说明返回值和哨兵相等，那么迭代结束 // 减少引用计数，并将 it_callable 和 it_sentinel 字段设置为 NULL Py_DECREF(result); if (ok > 0) { Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } } else if (PyErr_ExceptionMatches(PyExc_StopIteration)) { // 如果函数抛出了 StopIteration 异常，同样视为迭代结束 PyErr_Clear(); Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } return NULL;\n} 还是比较简单的，就是不停地调用可迭代对象，当返回值和哨兵相等时，迭代结束。","breadcrumbs":"50. 迭代器是怎么实现的？ » iter 函数接收两个参数","id":"222","title":"iter 函数接收两个参数"},"223":{"body":"通过探究迭代器，我们再次体会到了 Python 的设计哲学，虽然一切皆对象，但是拿到的都是对象的指针。像变量、函数参数等，它们存储的都不是对象本身，而是对象的泛型指针。而基于 PyObject * 和 ob_type，Python 巧妙地实现了多态。 不管变量 obj 指向什么样的可迭代对象，都可以交给 iter 函数，会调用类型对象内部的 __iter__（底层对应 tp_iter 字段），得到迭代器。不管变量 it 指向什么样的迭代器，都可以交给 next 函数进行迭代，会调用迭代器的类型对象的 __next__（底层对应 tp_iternext 字段），将值迭代出来。 至于 __iter__ 和 __next__ 本身，每个迭代器都会有，我们这里只以列表的迭代器为例。所以这是不是实现了多态呢？ 这就是 Python 的设计哲学，变量只是一个指针，传递变量的时候相当于传递指针（将指针拷贝一份），但操作一个变量的时候会自动操作变量（指针）指向的内存。 以上就是 Python 迭代器的相关内容，当然你也完全可以自己封装一个迭代器，有兴趣可以试一下。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"50. 迭代器是怎么实现的？ » 小结","id":"223","title":"小结"},"224":{"body":"当我们执行一个 py 文件的时候，只需要在命令行中输入 python xxx.py 即可，但你有没有想过这背后的流程是怎样的呢？ 首先 py 文件不是一上来就直接执行的，而是会先有一个编译的过程，整个步骤如下： 这里我们看到了 Python 编译器、Python 虚拟机，而且我们平常还会说 Python 解释器，那么三者之间有什么区别呢？ Python 编译器负责将 Python 源代码编译成 PyCodeObject 对象，然后交给 Python 虚拟机来执行。 那么 Python 编译器和 Python 虚拟机都在什么地方呢？如果打开 Python 的安装目录，会发现有一个 python.exe，点击的时候会通过它来启动一个终端。但问题是这个文件大小还不到 100K，不可能容纳一个编译器加一个虚拟机，所以它下面还有一个 python38.dll。没错，编译器、虚拟机都藏身于 python38.dll 当中。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 楔子","id":"224","title":"楔子"},"225":{"body":"在 Python 开发时，我们肯定都见过这个 pyc 文件，它一般位于 __pycache__ 目录中，那么 pyc 文件和 PyCodeObject 之间有什么关系呢？ 首先我们都知道字节码，虚拟机的执行实际上就是对字节码不断解析的一个过程。然而除了字节码之外，还应该包含一些其它的信息，这些信息也是 Python 运行的时候所必需的，比如常量、变量名等等。 因此我们常听到 py 文件被编译成字节码，这句话其实不太严谨，因为字节码只是一个 PyBytesObject 对象、或者说一段字节序列。但很明显，光有字节码是不够的，还有很多的静态信息也需要被收集起来，它们整体被称为 PyCodeObject，然后 PyCodeObject 对象中有一个字段 co_code，它是一个指针，指向了这段字节序列。但是这个对象除了有指向字节码的 co_code 字段之外，还有很多其它字段，负责保存代码涉及到的常量、变量（名字、符号）等等。 所以虽然编写的是 py 文件，但虚拟机执行的是编译后的 PyCodeObject 对象。但是问题来了，难道每一次执行都要将源文件编译一遍吗？如果没有对源文件进行修改的话，那么完全可以使用上一次的编译结果。相信此时你能猜到 pyc 文件是干什么的了，它就是负责保存编译之后的 PyCodeObject 对象。 现在我们知道了，pyc 文件里面保存的内容是 PyCodeObject 对象。对于 Python 编译器来说，PyCodeObject 对象是对源代码编译之后的结果，而 pyc 文件则是这个对象在硬盘上的表现形式。 当下一次运行的时候，Python 解释器会根据 pyc 文件中记录的编译结果，直接建立内存中的 PyCodeObject 对象，而不需要再重新编译了，当然前提是没有对源文件进行修改。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » pyc 文件是什么","id":"225","title":"pyc 文件是什么"},"226":{"body":"既然 PyCodeObject 对象是源代码的编译结果，那么搞清楚它的底层结构就至关重要，下面来看一下它长什么样子。 // Include/cpython/code.h typedef struct { PyObject_HEAD int co_argcount; int co_posonlyargcount; int co_kwonlyargcount; int co_nlocals; int co_stacksize; int co_flags; int co_firstlineno; PyObject *co_code; PyObject *co_consts; PyObject *co_names; PyObject *co_varnames; PyObject *co_freevars; PyObject *co_cellvars; Py_ssize_t *co_cell2arg; PyObject *co_filename; PyObject *co_name; PyObject *co_lnotab; void *co_zombieframe; PyObject *co_weakreflist; void *co_extra; unsigned char *co_opcache_map; _PyOpcache *co_opcache; int co_opcache_flag; unsigned char co_opcache_size;\n} PyCodeObject; 这里面的每一个字段，我们一会儿都会详细介绍，并通过代码逐一演示。总之 Python 编译器在对源代码进行编译的时候，针对每一个 code block（代码块），都会创建一个 PyCodeObject 与之对应。但多少代码才算得上是一个 block 呢？事实上，Python 有一个简单而清晰的规则：当进入一个新的名字空间，或者说作用域时，就算是进入一个新的 block 了。举个例子： class A: a = 123 def foo(): a = [] 我们仔细观察一下上面这段代码，它在编译完之后会有三个 PyCodeObject 对象，一个是对应整个 py 文件（模块）的，一个是对应 class A 的，一个是对应 def foo 的。因为这是三个不同的作用域，所以会有三个 PyCodeObject 对象。 所以一个 code block 对应一个作用域、同时也对应一个 PyCodeObject 对象。Python 的类、函数、模块都有自己独立的作用域，因此在编译时也都会有一个 PyCodeObject 对象与之对应。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 底层结构","id":"226","title":"PyCodeObject 底层结构"},"227":{"body":"PyCodeObject 我们知道它是干什么的了，那如何才能拿到这个对象呢？首先该对象在 Python 里面的类型是 <class 'code'>，但是底层没有将这个类暴露给我们，因此 code 这个名字在 Python 里面只是一个没有定义的变量罢了。 但我们可以通过其它的方式进行获取，比如函数。 def func(): pass print(func.__code__) # <code object ......\nprint(type(func.__code__)) # <class 'code'> 我们可以通过函数的 __code__ 属性拿到底层对应的 PyCodeObject 对象，当然也可以获取里面的字段，下面就来演示一下，并详细介绍每个字段的含义。 PyObject_HEAD：对象的头部信息 我们看到 Python 真的一切皆对象，源代码编译之后的结果也是一个对象。 co_argcount：可以通过位置参数传递的参数个数 def foo(a, b, c=3): pass\nprint(foo.__code__.co_argcount) # 3 def bar(a, b, *args): pass\nprint(bar.__code__.co_argcount) # 2 def func(a, b, *args, c): pass\nprint(func.__code__.co_argcount) # 2 函数 foo 中的参数 a、b、c 都可以通过位置参数传递，所以结果是 3。而函数 bar 则是两个，这里不包括 *args。最后函数 func 显然也是两个，因为参数 c 只能通过关键字参数传递。 co_posonlyargcount：只能通过位置参数传递的参数个数，Python3.8 新增 def foo(a, b, c): pass\nprint(foo.__code__.co_posonlyargcount) # 0 def bar(a, b, /, c): pass\nprint(bar.__code__.co_posonlyargcount) # 2 注意：这里是只能通过位置参数传递的参数个数。对于 foo 而言，里面的三个参数既可以通过位置参数、也可以通过关键字参数传递，所以个数是 0。而函数 bar，里面的 a、b 只能通过位置参数传递，所以个数是 2。 co_kwonlyargcount：只能通过关键字参数传递的参数个数 def foo(a, b=1, c=2, *, d, e): pass\nprint(foo.__code__.co_kwonlyargcount) # 2 这里是 d 和 e，它们必须通过关键字参数传递。 co_nlocals：代码块中局部变量的个数，也包括参数 def foo(a, b, *args, c, **kwargs): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'args', 'kwargs', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_nlocals)\n\"\"\"\n8\n\"\"\" co_varnames 保存的是代码块的局部变量，显然 co_nlocals 就是它的长度。并且我们看到在编译之后，函数的局部变量就已经确定了，因为它们是静态存储的。 co_stacksize：执行该段代码块所需要的栈空间 def foo(a, b, c): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_stacksize) # 1 这个暂时不需要太关注，后续介绍栈帧的时候会详细说明。 co_flags：函数标识 先来提出一个问题： def some_func(): return \"hello world\" def some_gen(): yield return \"hello world\" print(some_func.__class__)\nprint(some_gen.__class__)\n\"\"\"\n<class 'function'>\n<class 'function'>\n\"\"\" print(some_func())\n\"\"\"\nhello world\n\"\"\"\nprint(some_gen())\n\"\"\"\n<generator object some_gen at 0x1028a80b0>\n\"\"\" 调用 some_func 会将代码执行完毕，调用 some_gen 会返回生成器，但问题是这两者都是函数类型，为什么执行的时候会有不同的表现呢？可能有人觉得这还不简单，Python 具有词法作用域，由于 some_func 里面没有出现 yield 关键字，所以是普通函数，而 some_gen 里面出现了 yield，所以是生成器函数。 从源代码来看确实如此，但源代码是要编译成 PyCodeObject 对象的，在编译之后，函数内部是否出现 yield 关键字这一信息要怎么体现呢？答案便是通过 co_flags 字段。 然后解释器内部定义了一系列的标志位，通过和 co_flags 字段按位与，便可判断函数是否具备指定特征。常见的标志位如下： // Include/code.h // 函数参数是否包含 *args\n#define CO_VARARGS 0x0004\n// 函数参数是否包含 **kwargs\n#define CO_VARKEYWORDS 0x0008\n// 函数是否是内层函数\n#define CO_NESTED 0x0010\n// 函数是否是生成器函数\n#define CO_GENERATOR 0x0020\n// 函数是否是协程函数\n#define CO_COROUTINE 0x0080\n// 函数是否是异步生成器函数\n#define CO_ASYNC_GENERATOR 0x0200 我们实际测试一下，比如检测函数的参数类型： CO_VARARGS = 0x0004\nCO_VARKEYWORDS = 0x0008\nCO_NESTED = 0x0010 def foo(*args): pass def bar(): pass # 因为 foo 的参数包含 *args，所以和 CO_VARARGS 按位与的结果为真\n# 而 bar 的参数不包含 *args，所以结果为假\nprint(foo.__code__.co_flags & CO_VARARGS) # 4\nprint(bar.__code__.co_flags & CO_VARARGS) # 0 def foo(**kwargs): pass def bar(): pass print(foo.__code__.co_flags & CO_VARKEYWORDS) # 8\nprint(bar.__code__.co_flags & CO_VARKEYWORDS) # 0 def foo(): def bar(): pass return bar # foo 是外层函数，所以和 CO_NESTED 按位与的结果为假\n# foo() 返回的是内层函数，所以和 CO_NESTED 按位与的结果为真\nprint(foo.__code__.co_flags & CO_NESTED) # 0\nprint(foo().__code__.co_flags & CO_NESTED) # 16 当然啦，co_flags 还可以检测一个函数的类型。比如函数内部出现了 yield，那么它就是一个生成器函数，调用之后会得到一个生成器；使用 async def 定义，那么它就是一个协程函数，调用之后会得到一个协程。 这些在词法分析的时候就可以检测出来，编译之后会体现在 co_flags 字段中。 CO_GENERATOR = 0x0020\nCO_COROUTINE = 0x0080\nCO_ASYNC_GENERATOR = 0x0200 # 如果是生成器函数，那么 co_flags & 0x20 为真\ndef foo1(): yield\nprint(foo1.__code__.co_flags & 0x20) # 32 # 如果是协程函数，那么 co_flags & 0x80 为真\nasync def foo2(): pass\nprint(foo2.__code__.co_flags & 0x80) # 128\n# 显然 foo2 不是生成器函数，所以 co_flags & 0x20 为假\nprint(foo2.__code__.co_flags & 0x20) # 0 # 如果是异步生成器函数，那么 co_flags & 0x200 为真\nasync def foo3(): yield\nprint(foo3.__code__.co_flags & 0x200) # 512\n# 显然它不是生成器函数、也不是协程函数\n# 因此和 0x20、0x80 按位与之后，结果都为假\nprint(foo3.__code__.co_flags & 0x20) # 0\nprint(foo3.__code__.co_flags & 0x80) # 0 在判断函数种类时，这种方式是最优雅的。 co_firstlineno：代码块的起始位置在源文件中的哪一行 def foo(a, b, c): pass # 显然是文件的第一行\n# 或者理解为 def 所在的行\nprint(foo.__code__.co_firstlineno) # 1 如果函数出现了调用呢？ def foo(): return bar def bar(): pass print(foo().__code__.co_firstlineno) # 4 如果执行 foo，那么会返回函数 bar，因此结果是 def bar(): 所在的行数。所以每个函数都有自己的作用域，以及 PyCodeObject 对象。 co_code：指令集，也就是字节码，它是一个 bytes 对象 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 字节码，一个 bytes 对象，它保存了要操作的指令\n# 但光有字节码是肯定不够的，还需要其它的静态信息\n# 显然这些信息连同字节码一样，都位于 PyCodeObject 中\nprint(foo.__code__.co_code)\n\"\"\"\nb'd\\x01}\\x03d\\x02}\\x04d\\x03}\\x05t\\x00|\\x03|\\x04|\\x05\\x83\\x03\\x01\\x00d\\x00S\\x00'\n\"\"\" co_consts：常量池，一个元组，保存代码块中创建的所有常量 def foo(): a = 122 + 1 b = \"hello\" c = (1, 2) d = [\"x\", \"y\"] e = {\"p\": \"k\"} f = {7, 8} print(foo.__code__.co_consts)\n\"\"\"\n(None, 123, 'hello', (1, 2), 'x', 'y', 'p', 'k', 7, 8)\n\"\"\" co_consts 里面出现的都是编译阶段可以确定的常量，而 [\"x\", \"y\"] 和 {\"p\": \"k\"} 没有出现，由此我们可以得出，列表和字典绝不是在编译阶段构建的。编译时，只是收集了里面的元素，然后等到运行时再去动态构建。 不过问题来了，在构建的时候解释器怎么知道是要构建列表、还是字典、亦或是其它的什么对象呢？所以这就依赖于字节码了，解释字节码的时候，会判断到底要构建什么样的对象。因此解释器执行的是字节码，核心逻辑都体现在字节码中，但是光有字节码还不够，它包含的只是程序的主干逻辑，至于变量、常量，则从符号表和常量池里面获取。 另外函数里面的变量 a 等于 122 + 1，但常量池里面却存储了 123，这个过程叫做常量折叠。常量之间的加减乘除，结果依旧是一个常量，编译阶段就会计算好。 co_names：符号表，一个元组，保存代码块中引用的其它作用域的变量 c = 1 def foo(a, b): print(a, b, c) d = (list, int, str) print(foo.__code__.co_names)\n\"\"\"\n('print', 'c', 'list', 'int', 'str')\n\"\"\" 虽然一切皆对象，但看到的都是指向对象的变量，所以 print, c, list, int, str 都是变量，它们都不在当前 foo 函数的作用域中。 co_varnames：符号表，一个元组，保存当前作用域中创建的局部变量 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 当前作用域中创建的变量，注意它和 co_names 的区别\n# co_varnames 保存的是当前作用域中创建的局部变量\n# 而 co_names 保存的是当前作用域中引用的其它作用域的变量\nprint(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_varnames)\n\"\"\"\n('print',)\n\"\"\" co_cellvars：一个元组，保存外层函数的作用域中被内层函数引用的变量 co_freevars：一个元组，保存内层函数引用的外层函数的作用域中的变量 def foo(a, b, c): def bar(): print(a, b, c) return bar # co_cellvars：外层函数的作用域中被内层函数引用的变量\n# co_freevars：内层函数引用的外层函数的作用域中的变量\nprint(foo.__code__.co_cellvars)\nprint(foo.__code__.co_freevars)\n\"\"\"\n('a', 'b', 'c')\n()\n\"\"\"\n# foo 里面的变量 a、b、c 被内层函数 bar 引用了\n# 所以它的 co_cellvars 是 ('a', 'b', 'c')\n# 而 foo 不是内层函数，所以它的 co_freevars 是 () bar = foo(1, 2, 3)\nprint(bar.__code__.co_cellvars)\nprint(bar.__code__.co_freevars)\n\"\"\"\n()\n('a', 'b', 'c')\n\"\"\"\n# bar 引用了外层函数 foo 里面的变量 a、b、c\n# 所以它的 co_freevars 是 ('a', 'b', 'c')\n# 而 bar 已经是最内层函数了，所以它的 co_cellvars 是 () 当然目前的函数只嵌套了两层，但嵌套三层甚至更多层也是一样的。 def foo(a, b, c): def bar(d, e): print(a) def func(): print(b, c, d, e) return func return bar # 对于 foo 而言，它的内层函数就是 bar\n# 至于最里面的 func，由于定义在 bar 的内部，因此可以看做是 bar 函数体的一部分\n# 而 foo 里面的变量 a、b、c 都被内层函数引用了\nprint(foo.__code__.co_cellvars) # ('a', 'b', 'c')\nprint(foo.__code__.co_freevars) # () bar = foo(1, 2, 3)\n# 对于函数 bar 而言，它的内层函数就是 func\n# 而显然 bar 里面的变量 d 和 e 被 func 引用了\nprint(bar.__code__.co_cellvars) # ('d', 'e')\n# 然后 bar 引用了外层函数 foo 里面的 a、b、c\nprint(bar.__code__.co_freevars) # ('a', 'b', 'c')\n# 所以 co_cellvars 和 co_freevars 这两个字段的关系有点类似镜像 co_cellvars 和 co_freevars 在后续介绍闭包的时候会用到。 co_filename：代码块所在的文件的路径 # 文件名：main.py\ndef foo(): pass print(foo.__code__.co_filename)\n\"\"\"\n/Users/satori/Documents/testing_project/main.py\n\"\"\" 如果你无法使用 IDE，那么便可通过该字段查看函数定义在哪个文件中。 co_name：代码块的名字 def foo(): pass print(foo.__code__.co_name) # foo 对于函数来说，代码块的名字就是函数名。 co_lnotab：负责存储指令的偏移量和源代码行号之间的对应关系 PyCodeObject 是源代码编译之后的产物，虽然两者的结构千差万别，但体现出的信息是一致的。像源代码具有行号，那么编译成 PyCodeObject 之后，行号信息也应该要有专门的字段来维护，否则报错时我们就无法快速定位到行号。 def foo(): name = \"古明地觉\" hobby = ( \"sing\", \"dance\", \"rap\", \"🏀\" ) age = 16 我们通过 dis 模块反编译一下。 第一列数字表示行号，第二列数字表示字节码指令的偏移量，或者说指令在整个字节码指令集中的索引。我们知道字节码指令集就是一段字节序列，由 co_code 字段维护，并且每个指令都带有一个参数，所以偏移量（索引）为 0 2 4 6 8 ··· 的字节表示指令，偏移量为 1 3 5 7 9 ··· 的字节表示参数。 关于反编译的具体细节后续会说，总之一个字节码指令就是一个八位整数。对于当前函数来说，它的字节码偏移量和行号的对应关系如下： 偏移量和源代码行号的对应关系便由 co_lnotab（一个字节序列）维护，只不过 co_lnotab 并没有直接记录这些信息，而是记录的增量值。 (0, 1) 到 (0, 2)：偏移量增加 0，行号增加 1； (0, 2) 到 (4, 3)：偏移量增加 4，行号增加 1； (4, 3) 到 (8, 9)：偏移量增加 4，行号增加 6； 所以 co_lnotab 便是 0 1 4 1 4 6，我们验证一下。 结果和我们分析的一样。 以上就是 PyCodeObject 里面的字段的含义，至于剩下的几个字段就无需关注了。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 字段解析","id":"227","title":"PyCodeObject 字段解析"},"228":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机。 编译器先将 .py 源码文件编译成 PyCodeObject 对象，然后再交给虚拟机执行。 PyCodeObject 对象可以认为是源码文件的另一种等价形式，但经过编译，虚拟机可以更快速地执行。 为了避免每次都要对源文件进行编译，因此编译后的结果会序列化在 .pyc 文件中，如果源文件没有做改动，那么下一次执行时会直接从 .pyc 文件中读取。 Python 的函数、类、模块等，都具有各自的作用域，每个作用域对应一个独立的代码块，在编译时，Python 编译器会为每个代码块都创建一个 PyCodeObject 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 小结","id":"228","title":"小结"},"229":{"body":"上一篇文章我们介绍了 PyCodeObject 对象，但是还遗漏了一些内容，这里再单独补充一下。","breadcrumbs":"52. PyCodeObject 拾遗 » 楔子","id":"229","title":"楔子"},"23":{"body":"type 是所有类型对象的类型，我们称之为元类型或者元类，即 metaclass，当然它同时也是一个类型对象。下面看一下它的底层实现。 // Objects/typeobject.c PyTypeObject PyType_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"type\", /* tp_name */ sizeof(PyHeapTypeObject), /* tp_basicsize */ sizeof(PyMemberDef), /* tp_itemsize */ (destructor)type_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ (reprfunc)type_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ (ternaryfunc)type_call, /* tp_call */ // ...\n}; 所有的类型对象加上元类都是由 PyTypeObject 这个结构体实例化得到的，所以它们内部的字段都是一样的。只不过传入的值不同，实例化之后得到的结果也不同，可以是 PyLong_Type、可以是 PyFloat_Type，也可以是这里的 PyType_Type。 再看一下里面的宏 PyVarObject_HEAD_INIT，它用来初始化引用计数、类型和 ob_size，其中类型被初始化成了 &PyType_Type。换句话说，PyType_Type 里面的 ob_type 字段指向的还是 PyType_Type，而对应 Python 的话，就是 type 的类型还是 type。 >>> type.__class__\n<class 'type'>\n>>> type.__class__.__class__.__class__.__class__.__class__ is type\nTrue\n>>> type(type(type(type(type(type))))) is type\nTrue 显然不管套娃多少次，最终的结果都是 True，这也是符合预期的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的类型：PyType_Type","id":"23","title":"类型对象的类型：PyType_Type"},"230":{"body":"之前通过函数的 __code__ 属性获取了该函数的 PyCodeObject 对象，但是还有没有其它的方法呢？显然是有的，答案是通过内置函数 compile，不过在介绍 compile 之前，先介绍一下 eval 和 exec。 eval：传入一个字符串，然后把字符串里面的内容当做表达式。 a = 1\n# 所以 eval(\"a\") 就等价于 a\nprint(eval(\"a\")) # 1\nprint(eval(\"1 + 1 + 1\")) # 3 注意：eval 是有返回值的，返回值就是字符串里面的内容。所以 eval 接收的字符串里面一定是一个表达式，表达式计算之后是一个具体的值，比如 a = eval(\"1 + 2\")，等价于 a = 3。 但如果是语句的话，比如 a = eval(\"b = 3\")，这样等价于 a = (b = 3)，显然这会出现语法错误。因此 eval 函数把字符串两边的引号剥掉之后，得到的一定是一个普通的值。 try: print(eval(\"xxx\"))\nexcept NameError as e: print(e) # name 'xxx' is not defined 此时等价于 print(xxx)，但是 xxx 没有定义，所以报错。 # 此时是合法的，等价于 print('xxx')\nprint(eval(\"'xxx'\")) # xxx 以上就是 eval 函数，使用起来还是很方便的。 exec：传入一个字符串，把字符串里面的内容当成语句来执行，这个是没有返回值的，或者说返回值是 None。 # 相当于 a = 1\nexec(\"a = 1\") print(a) # 1 statement = \"\"\"\na = 123\nif a == 123: print(\"a 等于 123\")\nelse: print(\"a 不等于 123\")\n\"\"\"\nexec(statement) # a 等于 123 注意：a 等于 123 并不是 exec 返回的，而是把上面那坨字符串当成普通代码执行的时候 print 出来的。这便是 exec 的作用，将字符串当成语句来执行。 所以使用 exec 可以非常方便地创建多个变量。 import random for i in range(1, 5): exec(f\"a{i} = {random.randint(1, 100)}\") print(a1) # 72\nprint(a2) # 21\nprint(a3) # 38\nprint(a4) # 32 那么 exec 和 eval 的区别就显而易见了，eval 是要求字符串里面的内容能够当成一个值，并且该值就是 eval 函数的返回值。而 exec 则是直接执行里面的内容，返回值是 None。 print(eval(\"1 + 1\")) # 2\nprint(exec(\"1 + 1\")) # None # 相当于 a = 2\nexec(\"a = 1 + 1\")\nprint(a) # 2 try: # 相当于 a = 2，但很明显 a = 2 是一个语句 # 它无法作为一个值，因此放到 eval 里面就报错了 eval(\"a = 1 + 1\")\nexcept SyntaxError as e: print(e) # invalid syntax (<string>, line 1) 还是很好区分的，但是 eval 和 exec 在生产中尽量要少用。另外，eval 和 exec 还可以接收第二个参数和第三个参数，我们在介绍名字空间的时候再说。 compile：关键来了，它执行后返回的就是一个 PyCodeObject 对象。 这个函数接收哪些参数呢？ 参数一：当成代码执行的字符串 参数二：可以为这些代码起一个文件名 参数三：执行方式，支持三种，分别是 exec、single、eval 我们演示一下。 # exec：将源代码当做一个模块来编译\n# single：用于编译一个单独的 Python 语句（交互式）\n# eval：用于编译一个 eval 表达式\nstatement = \"a, b = 1, 2\"\n# 这里我们选择 exec，当成一个模块来编译\nco = compile(statement, \"古明地觉的编程教室\", \"exec\") print(co.co_firstlineno) # 1\nprint(co.co_filename) # 古明地觉的编程教室\nprint(co.co_argcount) # 0\n# 我们是以 a, b = 1, 2 这种方式赋值\n# 所以 (1, 2) 会被当成一个元组加载进来\n# 因此从这里可以看出，元组在编译阶段就已经确定好了\nprint(co.co_consts) # ((1, 2), None) statement = \"\"\"\na = 1\nb = 2\n\"\"\"\nco = compile(statement, \"<file>\", \"exec\")\nprint(co.co_consts) # (1, 2, None)\nprint(co.co_names) # ('a', 'b') 我们后面在分析 PyCodeObject 的时候，会经常使用 compile 函数。 然后 compile 还可以接收一个 flags 参数，也就是第四个参数，它的默认值为 0，表示按照标准模式进行编译，就是之前说的那几步。 对文本形式的源代码进行分词，将其切分成一个个的 Token； 对 Token 进行语法解析，生成抽象语法树（AST）； 将 AST 编译成 PyCodeObject 对象，简称 code 对象或者代码对象； 但如果将 flags 指定为 1024，那么 compile 函数在生成 AST 之后会直接停止，然后返回一个 _ast.Module 对象。 print( compile(\"a = 1\", \"<file>\", \"exec\").__class__\n) # <class 'code'> print( compile(\"a = 1\", \"<file>\", \"exec\", flags=1024).__class__\n) # <class '_ast.Module'> _ast 模块是和 Python 的抽象语法树相关的，那么问题来了，这个 _ast.Module 对象能够干什么呢？别着急，我们后续在介绍栈帧的时候说。不过由于抽象语法树比较底层，因此知道 compile 的前三个参数的用法即可。","breadcrumbs":"52. PyCodeObject 拾遗 » 内置函数 compile","id":"230","title":"内置函数 compile"},"231":{"body":"关于 Python 的字节码，是后面剖析虚拟机的重点，现在先来看一下。我们知道执行源代码之前会先编译得到 PyCodeObject 对象，里面的 co_code 字段指向了字节码序列，或者说字节码指令集。 虚拟机会根据这些指令集来进行一系列的操作（当然也依赖其它的静态信息），从而完成对程序的执行。关于指令，解释器定义了 100 多种，我们大致看一下。 // Include/opcode.h\n#define POP_TOP 1\n#define ROT_TWO 2\n#define ROT_THREE 3\n#define DUP_TOP 4\n#define DUP_TOP_TWO 5\n#define ROT_FOUR 6\n#define NOP 9\n#define UNARY_POSITIVE 10\n#define UNARY_NEGATIVE 11\n#define UNARY_NOT 12\n#define UNARY_INVERT 15\n#define BINARY_MATRIX_MULTIPLY 16\n#define INPLACE_MATRIX_MULTIPLY 17\n#define BINARY_POWER 19\n#define BINARY_MULTIPLY 20\n#define BINARY_MODULO 22\n#define BINARY_ADD 23\n#define BINARY_SUBTRACT 24\n#define BINARY_SUBSCR 25\n#define BINARY_FLOOR_DIVIDE 26\n#define BINARY_TRUE_DIVIDE 27\n#define INPLACE_FLOOR_DIVIDE 28\n#define INPLACE_TRUE_DIVIDE 29\n#define GET_AITER 50\n#define GET_ANEXT 51\n#define BEFORE_ASYNC_WITH 52\n#define BEGIN_FINALLY 53\n#define END_ASYNC_FOR 54\n#define INPLACE_ADD 55\n#define INPLACE_SUBTRACT 56\n#define INPLACE_MULTIPLY 57\n#define INPLACE_MODULO 59\n#define STORE_SUBSCR 60\n#define DELETE_SUBSCR 61\n#define BINARY_LSHIFT 62\n#define BINARY_RSHIFT 63\n#define BINARY_AND 64\n#define BINARY_XOR 65\n#define BINARY_OR 66\n#define INPLACE_POWER 67\n#define GET_ITER 68\n#define GET_YIELD_FROM_ITER 69\n#define PRINT_EXPR 70\n#define LOAD_BUILD_CLASS 71\n#define YIELD_FROM 72\n#define GET_AWAITABLE 73\n#define INPLACE_LSHIFT 75\n#define INPLACE_RSHIFT 76\n// ... 所谓字节码指令其实就是个整数，多个指令组合在一起便是字节码指令集（字节码序列），它是一个 bytes 对象。当然啦，指令集里面不全是指令，索引（偏移量）为偶数的字节表示指令，索引为奇数的字节表示指令参数，后续会细说。 然后我们可以通过反编译的方式查看每行 Python 代码都对应哪些操作指令。 # Python 的 dis 模块专门负责干这件事情\nimport dis def foo(a, b): c = a + b return c # 里面接收 PyCodeObject 对象\n# 当然函数也是可以的，会自动获取 co_code\ndis.dis(foo)\n\"\"\" 2 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 BINARY_ADD 6 STORE_FAST 2 (c) 3 8 LOAD_FAST 2 (c) 10 RETURN_VALUE\n\"\"\" 字节码反编译后的结果多么像汇编语言，其中第一列是源代码行号，第二列是字节码偏移量，第三列是字节码指令（也叫操作码），第四列是指令参数（也叫操作数）。Python 的字节码指令都是成对出现的，每个指令会带有一个指令参数。 另外查看字节码也可以使用 opcode 模块： from opcode import opmap opmap = {v: k for k, v in opmap.items()} def foo(a, b): c = a + b return c code = foo.__code__.co_code\nfor i in range(0, len(code), 2): print(\"操作码: {:<12} 操作数: {}\".format( opmap[code[i]], code[i+1] ))\n\"\"\"\n操作码: LOAD_FAST 操作数: 0\n操作码: LOAD_FAST 操作数: 1\n操作码: BINARY_ADD 操作数: 0\n操作码: STORE_FAST 操作数: 2\n操作码: LOAD_FAST 操作数: 2\n操作码: RETURN_VALUE 操作数: 0\n\"\"\" 总之字节码就是一段字节序列，转成列表之后就是一堆数字。偶数位置表示指令本身，而每个指令后面都会跟一个指令参数，也就是奇数位置表示指令参数。 所以指令本质上只是一个整数，而虚拟机会根据不同的指令执行不同的逻辑。说白了 Python 虚拟机执行字节码的逻辑就是把自己想象成一颗 CPU，并内置了一个巨型的 switch case 语句，其中每个指令都对应一个 case 分支。然后遍历整条字节码，拿到每一个指令和指令参数。接着对指令进行判断，不同的指令进入不同的 case 分支，执行不同的处理逻辑，直到字节码全部执行完毕或者程序出错。 关于执行字节码的具体流程，等介绍栈帧的时候细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"52. PyCodeObject 拾遗 » 字节码与反编译","id":"231","title":"字节码与反编译"},"232":{"body":"上一篇文章我们介绍了字节码，当时提到，py 文件在执行的时候会先被编译成 PyCodeObject 对象，并且该对象还会被保存到 pyc 文件中。 然而事实并不总是这样，有时当我们运行一个简单的程序时，并没有产生 pyc 文件。因此我们猜测：有些 Python 程序只是临时完成一些琐碎的工作，这样的程序仅仅只会运行一次，然后就不会再使用了，因此也就没有保存至 pyc 文件的必要。 如果我们在代码中加上了一个 import abc 这样的语句，再执行你就会发现解释器为 abc.py 生成了 pyc 文件，这就说明 import 语句会触发 pyc 的生成。 实际上，在运行过程中，如果碰到 import abc 这样的语句，那么 Python 会在设定好的 path 中寻找 abc.pyc 或者 abc.pyd 文件。但如果没有这些文件，而是只发现了 abc.py，那么会先将 abc.py 编译成 PyCodeObject，然后写入到 pyc 文件中。 接下来，再对 abc.pyc 进行 import 动作。对的，并不是编译成 PyCodeObject 对象之后就直接使用，而是先写到 pyc 文件里，然后再将 pyc 文件里面的 PyCodeObject 对象重新在内存中复制出来。 当然啦，触发 pyc 文件生成不仅可以通过 import，还可以通过 py_compile 模块手动生成。比如当前有一个 tools.py，代码如下。 a = 1\nb = \"你好啊\" 如何将其编译成 pyc 呢？ import py_compile py_compile.compile(\"tools.py\") 查看当前目录的 __pycache__ 目录，会发现 pyc 已经生成了。 py文件名.cpython-版本号.pyc 便是编译之后的 pyc 文件名。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的触发","id":"232","title":"pyc 文件的触发"},"233":{"body":"如果有一个现成的 pyc 文件，我们要如何导入它呢？ from importlib.machinery import SourcelessFileLoader tools = SourcelessFileLoader( \"tools\", \"__pycache__/tools.cpython-38.pyc\"\n).load_module() print(tools.a) # 1\nprint(tools.b) # 你好啊 以上我们就成功手动导入了 pyc 文件。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的导入","id":"233","title":"pyc 文件的导入"},"234":{"body":"pyc 文件在创建的时候都会往里面写入哪些内容呢？ 1）magic number 这是解释器内部定义的一个值，不同版本的解释器会定义不同的 magic number，这个值是为了保证能够加载正确的 pyc，比如 Python3.8 不会加载 3.7 版本的 pyc。因为解释器在加载 pyc 文件的时候会检测该 pyc 的 magic number，如果和自身的 magic number 不一致，说明此 pyc 是由其它版本的解释器写入的，因此拒绝加载。 from importlib.util import MAGIC_NUMBER\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: magic_number = f.read(4)\nprint(magic_number) # b'U\\r\\r\\n' pyc 文件的前 4 个字节便是 magic number。 2）py 文件的最后修改时间 这个很好理解，在加载 pyc 的时候会比较源代码的实际修改时间和 pyc 文件中存储的修改时间。如果两者不相等，说明在生成 pyc 之后，源代码又被修改了，那么会重新编译并写入 pyc，而反之则会直接加载已存在的 pyc。 3）py 文件的大小 py 文件的大小也会被记录在 pyc 文件中。 4）PyCodeObject 对象 编译之后的 PyCodeObject 对象，这个不用说了，肯定是要存储的，并且是序列化之后再存储。 因此 pyc 文件的结构如下： 我们实际验证一下： import struct\nfrom importlib.util import MAGIC_NUMBER\nfrom datetime import datetime with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 0 ~ 4 字节是 MAGIC NUMBER\nprint(data[: 4]) # b'U\\r\\r\\n'\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' # 4 ~ 8 字节是 4 个 \\x00\nprint(data[4: 8]) # b'\\x00\\x00\\x00\\x00' # 8 ~ 12 字节是 py 文件的最后修改时间（小端存储），一个时间戳\nts = struct.unpack(\"<I\", data[8: 12])[0]\nprint(ts) # 1734595934\nprint(datetime.fromtimestamp(ts)) # 2024-12-19 08:12:14 # 12 ~ 16 字节是 py 文件的大小\nprint(struct.unpack(\"<I\", data[12: 16])[0]) # 22 那么实际的 tools.py 是不是这样呢？我们查看一下。 结果没有问题，实际大小是 22 字节，和 pyc 文件记录的一样。然后是最后修改时间，由于在生成 pyc 之后，没有对源文件做修改，所以它的最后修改时间和 pyc 文件记录的一样，都是 08:12。但如果我们再对 tools.py 做修改的话，那么它的最后修改时间和 pyc 文件记录的就不一样了，此时如果再导入 tools.py 就会重新编译生成 pyc，并写入新的最后修改时间。 以上就是 pyc 文件的前 16 个字节，而 16 个字节往后就是 PyCodeObject 对象，并且是序列化之后的，因为该对象显然无法直接存在文件中。 import marshal with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 通过 marshal.loads 可以反序列化\n# marshal.dumps 则表示序列化\ncode = marshal.loads(data[16:])\n# 此时就拿到了 py 文件编译之后的 PyCodeObject\nprint(code)\n\"\"\"\n<code object <module> at 0x..., file \"tools.py\", line 1>\n\"\"\"\n# 查看常量池\nprint(code.co_consts) # (1, '你好啊', None) # 符号表\nprint(code.co_names) # ('a', 'b') 常量池和符号表都是正确的。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件都包含哪些内容","id":"234","title":"pyc 文件都包含哪些内容"},"235":{"body":"下面通过源码来查看 pyc 文件的写入过程，既然要写入，那么肯定要有文件句柄。 // Python/marshal.c // FILE 是 C 自带的文件句柄\n// 可以把 WFILE 看成是 FILE 的包装\ntypedef struct { FILE *fp; // 下面的字段在写入数据的时候会看到 int error; int depth; PyObject *str; char *ptr; char *end; char *buf; _Py_hashtable_t *hashtable; int version;\n} WFILE; 首先是写入 magic number、创建时间和文件大小，它们会调用 PyMarshal_WriteLongToFile 函数进行写入： // Python/marshal.c\nvoid\nPyMarshal_WriteLongToFile(long x, FILE *fp, int version)\n{ // magic number、创建时间和文件大小，只是一个 4 字节整数 // 因此使用 char[4] 来保存 char buf[4]; // 声明一个 WFILE 类型的变量 wf WFILE wf; // 内存初始化 memset(&wf, 0, sizeof(wf)); // 初始化内部字段 wf.fp = fp; // 文件句柄 wf.ptr = wf.buf = buf; // buf 数组首元素的地址 wf.end = wf.ptr + sizeof(buf); // buf 数组尾元素的地址 wf.error = WFERR_OK; wf.version = version; // 调用 w_long 将信息写到 wf 里面 // 写入的信息可以是 magic number、时间和文件大小 w_long(x, &wf); // 刷到磁盘上 w_flush(&wf);\n} 所以该函数只是初始化了一个 WFILE 对象，真正写入则是调用的 w_long。 // Python/marshal.c\nstatic void\nw_long(long x, WFILE *p)\n{ w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); w_byte((char)((x>>16) & 0xff), p); w_byte((char)((x>>24) & 0xff), p);\n} w_long 则是调用 w_byte 将 x 逐个字节地写到文件里面去。 当头信息写完之后，就该写 PyCodeObject 对象了，这个过程由 PyMarshal_WriteObjectToFile 函数负责。 // Python/marshal.c\nvoid\nPyMarshal_WriteObjectToFile(PyObject *x, FILE *fp, int version)\n{ char buf[BUFSIZ]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; if (w_init_refs(&wf, version)) return; /* caller mush check PyErr_Occurred() */ // 写入头信息由 PyMarshal_WriteLongToFile 负责，它内部会调用 w_long // 写入 PyCodeObject 由当前函数负责，它内部会调用 w_object w_object(x, &wf); w_clear_refs(&wf); w_flush(&wf);\n} 然后我们看一下 w_object 函数。 // Python/marshal.c\nstatic void\nw_object(PyObject *v, WFILE *p)\n{ char flag = '\\0'; p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->error = WFERR_NESTEDTOODEEP; } else if (v == NULL) { w_byte(TYPE_NULL, p); } else if (v == Py_None) { w_byte(TYPE_NONE, p); } else if (v == PyExc_StopIteration) { w_byte(TYPE_STOPITER, p); } else if (v == Py_Ellipsis) { w_byte(TYPE_ELLIPSIS, p); } else if (v == Py_False) { w_byte(TYPE_FALSE, p); } else if (v == Py_True) { w_byte(TYPE_TRUE, p); } else if (!w_ref(v, &flag, p)) w_complex_object(v, flag, p); p->depth--;\n} 可以看到 w_object 和 w_long 一样，本质上都是调用了 w_byte。当然 w_byte 只能写入一些简单数据，如果是列表、字典之类的数据，那么会调用 w_complex_object 函数，也就是代码中的最后一个 else if 分支。 w_complex_object 这个函数的源代码很长，我们看一下整体结构，具体逻辑就不贴了，后面会单独截取一部分进行分析。 // Python/marshal.c static void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ Py_ssize_t i, n; // 如果是整数，执行整数的写入逻辑 if (PyLong_CheckExact(v)) { // ... } // 如果是浮点数，执行浮点数的写入逻辑 else if (PyFloat_CheckExact(v)) { // ... } // 如果是复数，执行复数的写入逻辑 else if (PyComplex_CheckExact(v)) { // ... } // 如果是字节序列，执行字节序列的写入逻辑 else if (PyBytes_CheckExact(v)) { // ... } // 如果是字符串，执行字符串的写入逻辑 else if (PyUnicode_CheckExact(v)) { // ... } // 如果是元组，执行元组的写入逻辑 else if (PyTuple_CheckExact(v)) { // ... } // 如果是列表，执行列表的写入逻辑 else if (PyList_CheckExact(v)) { // ... } // 如果是字典，执行字典的写入逻辑 else if (PyDict_CheckExact(v)) { // ... } // 如果是集合，执行集合的写入逻辑 else if (PyAnySet_CheckExact(v)) { // ... } // 如果是 PyCodeObject 对象，执行 PyCodeObject 对象的写入逻辑 else if (PyCode_Check(v)) { // ... } // 如果是 Buffer，执行 Buffer 的写入逻辑 else if (PyObject_CheckBuffer(v)) { // ... } else { W_TYPE(TYPE_UNKNOWN, p); p->error = WFERR_UNMARSHALLABLE; }\n} 源代码虽然长，但是逻辑非常单纯，就是对不同的对象、执行不同的写动作，然而其最终目的都是通过 w_byte 写到 pyc 文件中。了解完函数的整体结构之后，我们再看一下具体细节，看看它在写入对象的时候到底写入了哪些内容？ // Python/marshal.c\nstatic void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ // ...... else if (PyList_CheckExact(v)) { W_TYPE(TYPE_LIST, p); n = PyList_GET_SIZE(v); W_SIZE(n, p); for (i = 0; i < n; i++) { w_object(PyList_GET_ITEM(v, i), p); } } else if (PyDict_CheckExact(v)) { Py_ssize_t pos; PyObject *key, *value; W_TYPE(TYPE_DICT, p); /* This one is NULL object terminated! */ pos = 0; while (PyDict_Next(v, &pos, &key, &value)) { w_object(key, p); w_object(value, p); } w_object((PyObject *)NULL, p); } // ......\n} 以列表和字典为例，它们在写入的时候实际上写的是内部的元素，其它对象也是类似的。 def foo(): lst = [1, 2, 3] # 把列表内的元素写进去了\nprint( foo.__code__.co_consts\n) # (None, 1, 2, 3) 但很明显，如果只是将元素收集起来显然是不够的，否则 Python 在加载的时候怎么知道它是一个列表呢？所以在写入的时候不能光写数据，还要将类型信息也写进去。我们再看一下上面列表和字典的写入逻辑，里面都调用了 W_TYPE，它负责写入类型信息。 因此无论对于哪种对象，在写入具体数据之前，都会先调用 W_TYPE 将类型信息写进去。如果没有类型信息，那么当解释器加载 pyc 文件的时候，只会得到一坨字节流，而无法解析字节流中隐藏的结构和蕴含的信息。所以在往 pyc 文件里写入数据之前，必须先写入一个标识，比如 TYPE_LIST、TYPE_TUPLE、TYPE_DICT 等等，这些标识正是对应的类型信息。 如果解释器在 pyc 文件中发现了这样的标识，则预示着上一个对象结束，新的对象开始，并且也知道新对象是什么样的对象，从而也知道该执行什么样的构建动作。至于这些标识都是可以看到的，在底层已经定义好了。 到了这里可以看到，Python 对 PyCodeObject 对象的导出实际上是不复杂的。因为不管什么对象，最后都会归结为两种简单的形式，一种是数值写入，一种是字符串写入。 上面都是对数值的写入，比较简单，仅仅需要按照字节依次写入 pyc 即可。然而在写入字符串的时候，Python 设计了一种比较复杂的机制，有兴趣可以自己阅读源码，这里不再介绍。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的写入","id":"235","title":"pyc 文件的写入"},"236":{"body":"最后再来说一下字节码混淆，我们知道 pyc 是可以反编译的，而且目前也有现成的工具。但这些工具会将每一个指令都解析出来，所以字节码混淆的方式就是往里面插入一些恶意指令（比如加载超出范围的数据），让反编译工具在解析的时候报错，从而失去作用。 但插入的恶意指令还不能影响解释器执行，因此还要插入一些跳转指令，从而让解释器跳过恶意指令。 混淆之后多了两条指令，其中偏移量为 8 的指令，参数为 255，表示加载常量池中索引为 255 的元素。如果常量池没有这么多元素，那么显然会发生索引越界，导致反编译的时候报错。 但对于解释器来说，是可以正常执行的，因为在执行到偏移量为 6 的指令时出现了一个相对跳转，直接跳到偏移量为 6 + 4 = 10 的指令了。 因此对于解释器执行来说，混淆前后是没有区别的，但对于反编译工具而言则无法正常工作，因为它会把每个指令都解析一遍。根据这个思路，我们可以插入很多很多的恶意指令，然后再利用跳转指令来跳过这些不合法的指令。当然混淆的手段并不止这些，我们还可以添加一些虚假的分支，然后在执行时跳转到真实的分支当中。 而这一切的目的，都是为了防止别人根据 pyc 文件反推出源代码。不过这种做法属于治标不治本，如果真的想要保护源代码的话，可以使用 Cython 将其编译成 pyd ，这是最推荐的做法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » 字节码混淆","id":"236","title":"字节码混淆"},"237":{"body":"从现在开始，我们将剖析虚拟机运行字节码的原理。前面说了，Python 解释器可以分为两部分：Python 编译器和 Python 虚拟机。编译器将源代码编译成 PyCodeObject 对象之后，就由虚拟机接手整个工作。虚拟机会从 PyCodeObject 中读取字节码，并在当前的上下文中执行，直到所有的字节码都被执行完毕。 那么问题来了，既然源代码在经过编译之后，字节码指令以及静态信息都存储在 PyCodeObject 当中，那么是不是意味着虚拟机就在 PyCodeObject 对象上进行所有的动作呢？ 很明显不是的，因为尽管 PyCodeObject 包含了关键的字节码指令以及静态信息，但有一个东西是没有包含、也不可能包含的，就是程序在运行时的执行环境，这个执行环境在 Python 里面就是栈帧。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 楔子","id":"237","title":"楔子"},"238":{"body":"那什么是栈帧呢？我们举个例子。 name = \"古明地觉\" def some_func(): name = \"八意永琳\" print(name) some_func()\nprint(name) 上面的代码当中出现了两个 print(name)，它们的字节码指令相同，但执行的效果却显然是不同的，这样的结果正是执行环境的不同所产生的。因为环境的不同，name 的值也不同。 因此同一个符号在不同环境中可能指向不同的类型、不同的值，必须在运行时进行动态捕捉和维护，这些信息不可能在 PyCodeObject 对象中被静态存储。 所以可以得出结论，虚拟机并不是在 PyCodeObject 对象上执行操作的，而是在栈帧对象上。虚拟机在执行时，会根据 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。所以栈帧是虚拟机执行的上下文，执行时依赖的所有信息都存储在栈帧中。 然后对于上面的代码，我们可以大致描述一下流程： 首先基于模块的 PyCodeObject 创建一个栈帧，假设叫 A，所有的字节码都会在栈帧中执行，虚拟机可以从栈帧里面获取变量的值，也可以修改； 当发生函数调用的时候，这里是 some_func，那么虚拟机会在栈帧 A 之上，为 some_func 创建一个新的栈帧，假设叫 B，然后在栈帧 B 里面执行函数 some_func 的字节码指令； 在栈帧 B 里面也有一个名字为 name 的变量，但由于执行环境、或者说栈帧的不同，name 指向的对象也不同； 一旦函数 some_func 的字节码指令全部执行完毕，那么会将当前的栈帧 B 销毁（也可以保留），再回到调用者的栈帧中来。就像是递归一样，每当调用函数时，就会在当前栈帧之上创建一个新的栈帧，一层一层创建，一层一层返回；","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧：虚拟机的执行环境","id":"238","title":"栈帧：虚拟机的执行环境"},"239":{"body":"不难发现，Python 虚拟机执行字节码这个过程，就是在模拟操作系统运行可执行文件。比如： 程序加载 操作系统：加载可执行文件到内存，设置程序计数器。 Python 虚拟机：加载 .pyc 文件中的 PyCodeObject 对象，初始化字节码指令指针。 内存管理 操作系统：为进程分配内存空间，管理堆和栈。 Python 虚拟机：创建和管理 Python 对象，处理内存分配和垃圾回收。 指令执行 操作系统：CPU 逐条执行机器指令。 Python 虚拟机：虚拟机逐条执行字节码指令。 资源管理 操作系统：管理文件句柄、网络连接等系统资源。 Python 虚拟机：管理文件对象、套接字等 Python 级别的资源。 异常处理 操作系统：处理硬件中断和软件异常。 Python 虚拟机：捕获和处理 Python 异常。 我们简单地画一张示意图，来看看在一台普通的 x64 机器上，可执行文件是以什么方式运行的，在这里主要关注栈帧的变化。假设有三个函数，函数 f 调用了函数 g，函数 g 又调用了函数 h。 首先 CPU 有两个关键的寄存器，它们在函数调用和栈帧管理中扮演关键角色。 RSP（Stack Pointer）：栈指针，指向当前栈帧的顶部，或者说最后一个入栈的元素。因此随着元素的入栈和出栈，RSP 会动态变化。由于地址从栈底到栈顶是逐渐减小的，所以 RSP 会随着数据入栈而减小，随着数据出栈而增大。当然不管 RSP 怎么变，它始终指向当前栈的顶部。 RBP（Base Pointer）：基指针，指向当前栈帧的基址，它的作用是提供一个固定的参考点，用于访问当前函数的局部变量和参数。当新的帧被创建时，它的基址会保存上一个帧的基址，并由 RBP 指向。 我们用一段 C 代码来解释一下。 #include <stdio.h> int add(int a, int b) { int c = a + b; return c;\n} int main() { int a = 11; int b = 22; int result = add(a, b); printf(\"a + b = %d\\n\", result);\n} 当执行函数 main 的时候，RSP 指向 main 栈帧的顶部，RBP 指向 main 栈帧的基址。然后在 main 里面又调用了函数 add，那么毫无疑问，系统会在地址空间中，在 main 的栈帧之上为 add 创建栈帧。然后让 RSP 指向 add 栈帧的顶部，RBP 指向 add 栈帧的基址，而 add 栈帧的基址保存了上一级栈帧（main 栈帧）的基址。 当函数 add 执行结束时，会销毁对应栈帧，再将 RSP 和 RBP 恢复为创建 add 栈帧之前的值，这样程序的执行流程就又回到了函数 main 里面，当然程序的运行空间也回到了函数 main 的栈帧中。 不难发现，通过两个 CPU 寄存器 RSP、RBP，以及栈帧中保存的上一级栈帧的基址，完美地维护了函数之间的调用链，这就是可执行文件在 x64 机器上的运行原理。 那么 Python 里面的栈帧是怎样的呢？","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 虚拟机和操作系统","id":"239","title":"虚拟机和操作系统"},"24":{"body":"Python 中有两个类型对象比较特殊，一个是站在类型金字塔顶端的 type，另一个是站在继承金字塔顶端的 object。看完了 type，再来看看 object。 由于 object 的类型是 type，那么在初始化 PyBaseObject_Type 的时候，它的 ob_type 一定也被设置成了 &PyType_Type。 我们看一下 PyBaseObject_Type 的具体实现，它同样定义在 Objects/typeobject.c 中。 类型对象在创建的时候，ob_type 字段都会被初始化成 &PyType_Type，而 object 也不例外，所以它的类型为 type，这个非常简单。但 type 的基类是 object，又是怎么一回事呢？ 之前介绍类型对象的时候，我们说类型对象内部的 tp_base 指向继承的基类，那么对于 PyType_Type 来讲，它内部的 tp_base 肯定是 &PyBaseObject_Type，即 object。 但令我们吃鲸的是，它的 tp_base 居然是个 0，也就是说基类为空。 在 C 中，将指针变量赋值为 0 和赋值为 NULL 是等价的，因为 NULL 就是值为 0 的指针常量。 不是说 type 的基类是 object 吗？为啥 tp_base 是 0 呢。事实上如果你去看其它类型的话，会发现它们内部的 tp_base 也是 0。为 0 的原因就在于我们目前看到的类型对象还不够完善，因为 Python 的动态性，显然不可能在定义的时候就将所有字段属性都设置好、然后解释器一启动就得到我们平时使用的类型对象。 因此目前看到的类型对象还不是最终形态，有一部分字段属性是在解释器启动之后再动态完善的，而这个完善的过程被称为类型对象的初始化，它由函数 PyType_Ready 负责。 // Objects/typeobject.c int\nPyType_Ready(PyTypeObject *type)\n{ // ... // 注意这里的 type 是一个 C 函数的参数，不是 Python 里的 <class 'type'> // 获取类型对象的基类（指针） base = type->tp_base; // 如果类型对象的 tp_base 为空，并且本身也不是 &PyBaseObject_Type // 那么就将它的 tp_base 设置为 &PyBaseObject_Type if (base == NULL && type != &PyBaseObject_Type) { base = type->tp_base = &PyBaseObject_Type; Py_INCREF(base); } // ...\n} 当解释器发现类对象还没有初始化时，会将其作为参数传递给 PyType_Ready，进行初始化。 初始化过程会做很多的工作，用于完善类型对象，而其中一项工作就是设置基类。如果发现类型对象的基类为空，那么就将基类设置为 object，因为在 Python3 里面新式类都要继承 object。当然啦，这个类不能是 object 本身，object 的基类是 None，因为继承链向上要有一个终点。 当 PyType_Ready 完成初始化之后，就得到我们平常使用的类型对象了，最终 PyType_Type 和 PyBaseObject_Type 的关系如下。 因此到目前为止，type 和 object 之间的恩怨纠葛算是真相大白了，总结一下： 1）和自定义类不同，内置的类不是由 type 实例化得到的，它们都是在底层预先定义好的，不存在谁创建谁。只是内置的类在定义的时候，它们的类型都被设置成了 type。这样不管是内置的类，还是自定义类，在调用时都可以执行 type 的 __call__ 函数，从而让它们的行为是一致的。 2）虽然内置的类在底层预定义好了，但还有一些瑕疵，因为有一部分逻辑无法以源码的形式体现，只能在解释器启动的时候再动态完善。而这个完善的过程，便包含了基类的填充，会将基类设置成 object。 所以 type 和 object 是同时出现的，它们的存在需要依赖彼此。首先这两者会以不完全体的形式定义在源码中，并且在定义的时候将 object 的类型设置成 type；然后当解释器启动的时候，再经过动态完善，进化成完全体，而进化的过程中会将 type 的基类设置成 object。 因此 object 的类型是 type，type 继承 object 就是这么来的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的基类：PyBaseObject_Type","id":"24","title":"类型对象的基类：PyBaseObject_Type"},"240":{"body":"相较于 x64 机器上看到的那个简简单单的栈帧，Python 的栈帧实际上包含了更多的信息。注：栈帧也是一个对象。 // Include/frameobject.h typedef struct _frame { PyObject_VAR_HEAD struct _frame *f_back; PyCodeObject *f_code; PyObject *f_builtins; PyObject *f_globals; PyObject *f_locals; PyObject **f_valuestack; PyObject **f_stacktop; PyObject *f_trace; char f_trace_lines; char f_trace_opcodes; PyObject *f_gen; int f_lasti; int f_lineno; int f_iblock; char f_executing; PyTryBlock f_blockstack[CO_MAXBLOCKS]; PyObject *f_localsplus[1];\n} PyFrameObject; 下面来解释一下里面的每个字段都是啥含义，不过在解释之前，我们要先知道如何在 Python 中获取栈帧对象。 import inspect def foo(): # 返回当前所在的栈帧 # 这个函数实际上是调用了 sys._getframe(1) return inspect.currentframe() frame = foo()\nprint(frame) \"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\nprint(type(frame)) \"\"\"\n<class 'frame'>\n\"\"\" 我们看到栈帧的类型是 <class 'frame'>，正如 PyCodeObject 对象的类型是 <class 'code'> 一样，这两个类没有暴露给我们，所以不可以直接使用。 同理，还有 Python 的函数，类型是 <class 'function'>，模块的类型是 <class 'module'>。这些解释器都没有给我们提供，如果直接使用的话，那么 frame、code、function、module 只是几个没有定义的变量罢了，这些类我们只能通过这种间接的方式获取。 下面来看一下 PyFrameObject 里面每个字段的含义。 PyObject_VAR_HEAD 变长对象的头部信息，所以栈帧也是一个对象。 struct _frame *f_back 当前栈帧的上一级栈帧，也就是调用者的栈帧。所以 x64 机器是通过 RSP、RBP 两个指针维护函数的调用关系，而 Python 虚拟机则是通过栈帧的 f_back 字段。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame)\n\"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\n# foo 的上一级栈帧，显然对应的是模块的栈帧\nprint(frame.f_back)\n\"\"\"\n<frame at 0x100adde40, file '.../main.py', line 12, code <module>>\n\"\"\"\n# 相当于模块的上一级栈帧，显然是 None\nprint(frame.f_back.f_back)\n\"\"\"\nNone\n\"\"\" 因此通过栈帧，可以轻松地获取完整的函数调用链路，我们一会儿演示。 PyCodeObject *f_code 栈帧对象是在 PyCodeObject 之上构建的，所以它内部一定有一个字段指向 PyCodeObject，而该字段就是 f_code。 import inspect def e(): f() def f(): g() def g(): h() def h(): frame = inspect.currentframe() # 获取栈帧 func_names = [] # 只要 frame 不为空，就一直循环，并将函数名添加到列表中 while frame is not None: func_names.append(frame.f_code.co_name) frame = frame.f_back print(f\"函数调用链路：{' -> '.join(func_names[:: -1])}\") f()\n\"\"\"\n函数调用链路：<module> -> f -> g -> h\n\"\"\" 模块 -> f -> g -> h，显然我们获取了整个调用链路，是不是很有趣呢？ PyObject *f_builtins、*f_gloabls、*f_locals 这三者均表示名字空间，其中 f_gloabls 指向全局名字空间（一个字典），它是全局变量的容身之所。是的，Python 的全局变量是通过字典存储的，调用函数 globals 即可拿到该字典。 # 等价于 name = \"古明地觉\"\nglobals()[\"name\"] = \"古明地觉\" # 等价于 print(name)\nprint(globals()[\"name\"]) # 古明地觉 def foo(): import inspect return inspect.currentframe() frame = foo()\n# frame.f_globals 同样会返回全局名字空间\nprint(frame.f_globals is globals()) # True\n# 相当于创建了一个全局变量 age\nframe.f_globals[\"age\"] = 18\nprint(age) # 18 关于名字空间，我们后面会用专门的篇幅详细说明。 然后 f_locals 指向局部名字空间（一个字典），但和全局变量不同，局部变量不存在局部名字空间中，而是静态存储在数组中。该字段先有个印象，后续再详细说。 f_builtins 指向内置名字空间（一个字典），显然一些内置的变量都存在里面。 def foo(): import inspect return inspect.currentframe() frame = foo()\nprint(frame.f_builtins[\"list\"](\"abcd\"))\n\"\"\"\n['a', 'b', 'c', 'd']\n\"\"\" 和我们直接使用 list(\"abcd\") 是等价的。 PyObject **f_valuestack 指向运行时栈的栈底，关于什么是运行时栈，后续详细说明。 PyObject **f_stacktop 指向运行时栈的栈顶。 PyObject *f_trace 追踪函数，用于调试。 char f_trace_lines 是否为每一行代码调用追踪函数，当设置为真（非零值）时，每当虚拟机执行到一个新的代码行时，都会调用追踪函数。这允许调试器在每行代码执行时进行干预，比如设置断点、检查变量等。 char f_trace_opcodes 是否为每个字节码指令调用追踪函数，当设置为真时，虚拟机会在执行每个字节码指令之前调用追踪函数。这提供了更细粒度的控制，允许进行指令级别的调试。 所以不难发现，f_trace_lines 是行级追踪，对应源代码的每一行，通常用于普通的调试，如设置断点、单步执行等，并且开销相对较小。f_trace_opcodes 是指令级追踪，对应每个字节码指令，通常用于更深层次的调试，比如分析具体的字节码执行过程，并且开销较大。 import sys def trace_lines(frame, event, arg): print(f\"行号：{frame.f_lineno}，文件名：{frame.f_code.co_filename}\") return trace_lines sys.settrace(trace_lines) 设置追踪函数一般需要通过 sys.settrace，不过不常用，了解一下即可。 PyObject *f_gen 是否是基于生成器的 PyCodeObject 构建的栈帧。 int f_lasti 上一条已执行完毕的指令在指令序列中的偏移量。 int f_lineno 获取该栈帧时的源代码行号。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame.f_lineno) # 4 我们是在第 4 行获取的栈帧，所以打印结果是 4。 int f_iblock 用于跟踪 try / except / finally 代码块的层级深度，它记录了当前栈帧中活跃的 try 语句块的数量，每进入一个新的 try 语句块时加 1，离开 try 语句块时减 1。 try: # f_iblock = 1 try: # f_iblock = 2 pass except: pass except: # f_iblock = 1 pass\nfinally: # f_iblock = 0 pass f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。 char f_executing 当前栈帧是否仍在执行。 PyTryBlock f_blockstack[CO_MAXBLOCKS] 一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？ SETUP_LOOP：循环块（for / while） SETUP_EXCEPT：try / except 块 SETUP_FINALLY：try / finally 块 SETUP_WITH：with 语句块 SETUP_ASYNC_WITH：async with 语句块 PyObject *localsplus[1] 一个柔性数组，负责维护 \"局部变量 + cell 变量 + free 变量 + 运行时栈\"，大小在运行时确定。 以上就是栈帧内部的字段，这些字段先有个印象，后续在剖析虚拟机的时候还会继续细说。 总之我们看到，PyCodeObject 并不是虚拟机的最终目标，虚拟机最终是在栈帧中执行的。每一个栈帧都会维护一个 PyCodeObject 对象，换句话说，每一个 PyCodeObject 对象都会隶属于一个栈帧。并且从 f_back 可以看出，虚拟机在实际执行时，会产生很多的栈帧对象，而这些对象会被链接起来，形成一条执行环境链表，或者说栈帧链表。 而这正是 x64 机器上栈帧之间关系的模拟，在 x64 机器上，栈帧之间通过 RSP 和 RBP 指针建立了联系，使得新栈帧在结束之后能够顺利地返回到旧栈帧中，而 Python 虚拟机则是利用 f_back 来完成这个动作。 当然，获取栈帧除了通过 inspect 模块之外，在捕获异常时，也可以获取栈帧。 def foo(): try: 1 / 0 except ZeroDivisionError: import sys # exc_info 返回一个三元组 # 分别是异常的类型、值、以及 traceback exc_type, exc_value, exc_tb = sys.exc_info() print(exc_type) # <class 'ZeroDivisionError'> print(exc_value) # division by zero print(exc_tb) # <traceback object at 0x00000135CEFDF6C0> # 调用 exc_tb.tb_frame 即可拿到异常对应的栈帧 # 另外这个 exc_tb 也可以通过下面这种方式获取 # except ZeroDivisionError as e; e.__traceback__ print(exc_tb.tb_frame.f_code.co_name) # foo print(exc_tb.tb_frame.f_back.f_code.co_name) # <module> # 显然 tb_frame 是当前函数 foo 的栈帧 # 那么 tb_frame.f_back 就是整个模块对应的栈帧 # 而 tb_frame.f_back.f_back 显然就是 None 了 print(exc_tb.tb_frame.f_back.f_back) # None foo() 关于栈帧内部的字段的含义，我们就说完了。当然如果有些字段现在不是很理解，也没关系，随着不断地学习，你会豁然开朗。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧的底层结构","id":"240","title":"栈帧的底层结构"},"241":{"body":"因为很多动态信息无法静态地存储在 PyCodeObject 对象中，所以 PyCodeObject 对象在交给虚拟机之后，虚拟机会在其之上动态地构建出 PyFrameObject 对象，也就是栈帧。 因此虚拟机是在栈帧里面执行的字节码，它包含了虚拟机在执行字节码时依赖的全部信息。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 小结","id":"241","title":"小结"},"242":{"body":"在介绍栈桢的时候，我们看到了 3 个独立的名字空间：f_locals、f_globals、f_builtins。名字空间对 Python 来说是一个非常重要的概念，虚拟机的运行机制和名字空间有着非常紧密的联系。并且在 Python 中，与名字空间这个概念紧密联系在一起的还有名字、作用域这些概念，下面我们就来剖析这些概念是如何体现的。","breadcrumbs":"55. 名字空间：变量的容身之所 » 楔子","id":"242","title":"楔子"},"243":{"body":"在这个系列的最开始我们就说过，从解释器的角度来看，变量只是一个泛型指针 PyObject *，而从 Python 的角度来看，变量只是一个名字、或者说符号，用于和对象进行绑定的。 name = \"古明地觉\" 上面这个赋值语句其实就是将 name 和 \"古明地觉\" 绑定起来，让我们可以通过 name 这个符号找到对应的 PyUnicodeObject。因此定义一个变量，本质上就是建立名字和对象之间的映射关系。 另外我们说 Python 虽然一切皆对象，但拿到的都是指向对象的指针，因此创建函数和类，以及模块导入，同样是在完成名字和对象的绑定。 def foo(): pass class A(): pass 创建一个函数也相当于定义一个变量，会先根据函数体创建一个函数对象，然后将名字 foo 和函数对象绑定起来。所以函数名和函数体之间是分离的，同理类也是如此。 import os 导入一个模块，也是在定义一个变量。import os 相当于将名字 os 和模块对象绑定起来，通过 os 可以找到指定的模块对象。 当我们导入一个模块的时候，解释器是这么做的。 import os 等价于 os = __import__(\"os\")，可以看到本质上还是一个赋值语句。 import numpy as np 中的 as 语句同样是在定义变量，将名字 np 和对应的模块对象绑定起来，以后就可以通过 np 这个名字去获取指定的模块了。 总结：无论是普通的赋值语句，还是定义函数和类，亦或是模块导入，它们本质上都是在完成变量和对象的绑定。 name = \"古明地觉\" def foo(): pass class A(): pass import os\nimport numpy as np 里面的 name、foo、A、os、np，都只是一个变量，或者说名字、符号，然后通过名字可以获取与之绑定的对象。","breadcrumbs":"55. 名字空间：变量的容身之所 » 变量只是一个名字","id":"243","title":"变量只是一个名字"},"244":{"body":"正如上面所说，赋值语句、函数定义、类定义、模块导入，本质上只是完成了变量和对象之间的绑定，或者说我们创建了变量到对象的映射，通过变量可以获取对应的对象，而它们的容身之所就是名字空间。 所以名字空间是通过 PyDictObject 对象实现的，这对于映射来说简直再适合不过了。而前面介绍字典的时候，我们说字典是被高度优化的，原因就是虚拟机本身也重度依赖字典，从这里的名字空间即可得到体现。 当然，在一个模块内部，变量还存在可见性的问题，比如： x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 我们看到同一个变量名，打印的确是不同的值，说明指向了不同的对象，换句话说这两个变量是在不同的名字空间中被创建的。 名字空间本质上是一个字典，如果两者在同一个名字空间，那么由于 key 的不重复性，当执行 x = 2 的时候，会把字典里面 key 为 \"x\" 的 value 给更新成 2。但是在外面还是打印 1，这说明两者所在的不是同一个名字空间，打印的也就自然不是同一个 x。因此对于一个模块而言，内部可以存在多个名字空间，每一个名字空间都与一个作用域相对应。作用域可以理解为一段程序的正文区域，在这个区域里面定义的变量是有意义的，然而一旦出了这个区域，就无效了。 关于作用域这个概念，我们要记住：它仅仅是由源代码的文本所决定。在 Python 中，一个变量在某个位置是否起作用，是由它的文本位置决定的。 因此 Python 具有静态作用域（词法作用域），而名字空间则是作用域的动态体现，一个由程序文本定义的作用域在运行时会转化为一个名字空间、即一个 PyDictObject 对象。比如进入一个函数，显然会进入一个新的作用域，因此函数在执行时，会创建一个名字空间。 在介绍 PyCodeObject 的时候，我们说解释器在对源代码进行编译的时候，对于代码中的每一个 code block，都会创建一个 PyCodeObject 对象与之对应。而当进入一个新的名字空间、或者说作用域时，就算是进入一个新的 block 了。 而根据我们使用 Python 的经验，显然函数、类都是一个新的 block，解释器在执行的时候会为它们创建各自的名字空间。 所以名字空间是名字、或者说变量的上下文环境，名字的含义取决于名字空间。更具体的说，一个变量绑定的对象是不确定的，需要由名字空间来决定。位于同一个作用域的代码可以直接访问作用域中出现的名字，即所谓的直接访问；但不同的作用域，则需要通过访问修饰符 . 进行属性访问。 class A: x = 1 class B: y = 2 print(A.x) # 1 print(y) # 2 如果想在 B 里面访问 A 里面的内容，要通过 A.属性的方式，表示通过 A 来获取 A 里面的属性。但是访问 B 的内容就不需要了，因为都是在同一个作用域，所以直接访问即可。 访问名字这样的行为被称为名字引用，名字引用的规则决定了 Python 程序的行为。 x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 还是上面的代码，如果我们把函数里面的 x = 2 给删掉，意味着函数的作用域里面已经没有 x 这个变量了，那么再执行程序会有什么结果呢？从 Python 层面来看，显然是会寻找外部的 x。因此我们可以得到如下结论： 作用域是层层嵌套的； 内层作用域可以访问外层作用域； 外层作用域无法访问内层作用域，如果是把外层的 x = 1 给去掉，那么最后面的 print(x) 铁定报错； 查找元素会依次从当前作用域向外查找，也就是查找元素时，对应的作用域是按照从小往大、从里往外的方向前进的；","breadcrumbs":"55. 名字空间：变量的容身之所 » 作用域和名字空间","id":"244","title":"作用域和名字空间"},"245":{"body":"不光函数、类有自己的作用域，模块对应的源文件本身也有相应的作用域。比如： name = \"古明地觉\"\nage = 16 def foo(): return 123 class A: pass 这个文件本身也有自己的作用域，并且是 global 作用域，所以解释器在运行这个文件的时候，也会为其创建一个名字空间，而这个名字空间就是 global 名字空间，即全局名字空间。它里面的变量是全局的，或者说是模块级别的，在当前文件的任意位置都可以直接访问。 而 Python 也提供了 globals 函数，用于获取 global 名字空间。 name = \"古明地觉\" def foo(): pass print(globals())\n\"\"\"\n{..., 'name': '古明地觉', 'foo': <function foo at 0x0000015255143E20>}\n\"\"\" 里面的 ... 表示省略了一部分输出，我们看到创建的全局变量就在里面。而且 foo 也是一个全局变量，它指向一个函数对象。 注意：我们说函数内部是一个独立的 block，因此它会对应一个 PyCodeObject。然后在解释到 def foo 的时候，会根据 PyCodeObject 对象创建一个 PyFunctionObject 对象，然后将 foo 和这个函数对象绑定起来。 当后续调用 foo 的时候，再根据 PyFunctionObject 对象创建 PyFrameObject 对象、然后执行，至于具体细节留到介绍函数的时候再细说。总之，我们看到 foo 也是一个全局变量，全局变量都在 global 名字空间中。并且 global 名字空间全局唯一，它是程序运行时的全局变量和与之绑定的对象的容身之所。你在任何一个位置都可以访问到 global 名字空间，正如你在任何一个位置都可以访问全局变量一样。 另外我们思考一下，global 名字空间是一个字典，全局变量和对象会以键值对的形式存在里面。那如果我手动地往 global 名字空间里面添加一个键值对，是不是也等价于定义一个全局变量呢？ globals()[\"name\"] = \"古明地觉\"\nprint(name) # 古明地觉 def foo1(): def foo2(): def foo3(): globals()[\"age\"] = 16 return foo3 return foo2 foo1()()()\nprint(age) # 16 我们看到确实如此，往 global 名字空间里面插入一个键值对完全等价于定义一个全局变量。并且 global 名字空间是唯一的，你在任何地方调用 globals() 得到的都是 global 名字空间，正如你在任何地方都可以访问到全局变量一样。 所以即使是在函数中给 global 名字空间添加一个键值对，也等价于定义一个全局变量。 问题来了，如果在函数里面，我们不获取 global 名字空间，怎么创建全局变量呢？ name = \"古明地觉\" def foo(): global name name = \"古明地恋\" print(name) # 古明地觉\nfoo()\nprint(name) # 古明地恋 很简单，Python 为我们准备了 global 关键字，表示声明的变量是全局的。","breadcrumbs":"55. 名字空间：变量的容身之所 » global 名字空间","id":"245","title":"global 名字空间"},"246":{"body":"像函数和类拥有的作用域，我们称之为 local 作用域，在运行时会对应 local 名字空间，即局部名字空间。由于不同的函数具有不同的作用域，所以局部名字空间可以有很多个，但全局名字空间只有一个。 对于 local 名字空间来说，它也对应一个字典，显然这个字典就不是全局唯一的了。而如果想获取局部名字空间，Python 也提供了 locals 函数。 def foo(): name = \"古明地觉\" age = 17 return locals() def bar(): name = \"雾雨魔理沙\" age = 18 return locals() print(locals() == globals()) # True\nprint(foo()) # {'name': '古明地觉', 'age': 17}\nprint(bar()) # {'name': '雾雨魔理沙', 'age': 18} 对于模块来讲，它的 local 名字空间和 global 名字空间是一样的，也就是说，模块对应的栈桢对象里面的 f_locals 和 f_globals 指向的是同一个 PyDictObject 对象。但对于函数而言，局部名字空间和全局名字空间就不一样了，调用 locals() 是获取自身的局部名字空间，而不同函数的局部名字空间是不同的。但是 globals() 函数的调用结果是一样的，获取的都是全局名字空间，这也符合函数内不存在指定变量的时候会去找全局变量这一结论。 注：关于 local 名字空间，还有一个重要的细节，全局变量会存储在 global 名字空间中，但局部变量却并不存储在 local 名字空间中。函数有哪些局部变量在编译的时候就已经确定了，会被静态存储在数组中，关于这一点，后续会单独详细说明。","breadcrumbs":"55. 名字空间：变量的容身之所 » local 名字空间","id":"246","title":"local 名字空间"},"247":{"body":"Python 有一个所谓的 LGB 规则，指的是在查找一个变量时，会按照自身的 local 空间、外层的 global 空间、内置的 builtin 空间的顺序进行查找。 builtin 名字空间也是一个字典，当 local 名字空间、global 名字空间都查找不到指定变量的时候，会去 builtin 空间查找。而关于 builtin 空间的获取，Python 提供了一个模块。 # 等价于 __builtins__\nimport builtins\nprint(builtins is __builtins__) # True\nprint(builtins) # <module 'builtins' (built-in)> builtins 是一个模块，那么 builtins.__dict__ 便是 builtin 名字空间，也叫内置名字空间。 import builtins # builtins.list 表示从 builtin 名字空间中查找 list\n# 它等价于 builtins.__dict__[\"list\"]\n# 而如果只写 list，那么由于 local 空间、global 空间都没有\n# 因此最终还是会从 builtin 空间中查找\n# 但如果是 builtins.list，那么就不兜圈子了\n# 表示：\"builtin 空间，就从你这里获取了\"\nprint(builtins.list is list) # True # 将 builtin 空间的 dict 改成 123\nbuiltins.dict = 123\n# 那么此时获取的 dict 就是 123\nprint(dict + 456) # 579 # 如果是 str = 123，等价于创建全局变量 str = 123\nstr = 123\n# 显然影响的是 global 空间\nprint(str) # 123\n# builtin 空间则不受影响\nprint(builtins.str) # <class 'str'>\nprint(builtins.__dict__[\"str\"]) # <class 'str'> 这里提一下在 Python2 中，while 1 比 while True 要快，为什么？ 因为 True 在 Python2 中不是关键字，所以它是可以作为变量名的。那么虚拟机在执行的时候就要先看 local 空间和 global 空间里有没有 True 这个变量，有的话使用我们定义的，没有的话再使用内置的 True。 而 1 是一个常量，直接加载就可以，所以 while True 多了符号查找这一过程。但是在 Python3 中两者就等价了，因为 True 在 Python3 中是一个关键字，也会直接作为一个常量来加载。","breadcrumbs":"55. 名字空间：变量的容身之所 » builtin 名字空间","id":"247","title":"builtin 名字空间"},"248":{"body":"记得之前介绍 exec 和 eval 的时候，我们说这两个函数里面还可以接收第二个参数和第三个参数，它们分别表示 global 名字空间、local 名字空间。 # 如果不指定，默认是当前所在的名字空间\n# 显然此时是全局名字空间\nexec(\"name = '古明地觉'\")\nprint(name) # 古明地觉 # 但我们也可以指定某个名字空间\nnamespace = {}\n# 比如将 namespace 作为全局名字空间\n# 另外这里没有指定第三个参数，也就是局部名字空间\n# 如果指定了第二个参数，但没有指定第三个参数\n# 那么第三个参数默认和第二个参数保持一致\nexec(\"name = 'satori'\", namespace)\nprint(namespace[\"name\"]) # satori 至于 eval 也是同理： namespace = {\"seq\": [1, 2, 3, 4, 5]}\ntry: print(eval(\"sum(seq)\"))\nexcept NameError as e: print(e) # name 'seq' is not defined\n# 告诉我们 seq 没有被定义\n# 如果将 namespace 作为名字空间\nprint(eval(\"sum(seq)\", namespace)) # 15 所以名字空间本质上就是一个字典，所谓的变量不过是字典里面的一个 key。为了进一步加深印象，再举个模块的例子： # 我们自定义一个模块吧\n# 首先模块也是一个对象，类型为 <class 'module'>\n# 但底层没有将这个类暴露给我们，所以需要换一种方式获取\nimport sys\nModuleType = type(sys) # 以上就拿到了模块的类型对象，调用即可得到模块对象\n# 这里我们自定义一个类，继承 ModuleType\nclass MyModule(ModuleType): def __init__(self, module_name): self.module_name = module_name super().__init__(module_name) # 也可以定义一些其它的属性 def __str__(self): return f\"<module '{self.module_name}' from '虚无之境'>\" my_module = MyModule(\"自定义模块\")\nprint(my_module)\n\"\"\"\n<module '自定义模块' from '虚无之境'>\n\"\"\" # 此时的 my_module 啥也没有，我们为其添砖加瓦\nmy_module.__dict__[\"name\"] = \"古明地觉\"\nprint(my_module.name) # 古明地觉 # 给模块设置属性，本质上也是操作模块的属性字典，当然获取属性也是如此\n# 如果再和 exec 结合的话\ncode_string = \"\"\"\nage = 16\ndef foo(): return \"我是函数 foo\" from functools import reduce \"\"\"\n# 将属性设置在模块的属性字典里面\nexec(code_string, my_module.__dict__)\n# 然后我们获取它\nprint(my_module.age) # 16\nprint(my_module.foo()) # 我是函数 foo\nprint(my_module.reduce(int.__add__, range(101))) # 5050 # 是不是很神奇呢？由于 my_module 是一个模块对象\n# 我们还可以将它注入到 sys.modules 中，然后通过 import 获取\nsys.modules[\"俺滴模块\"] = my_module\nfrom 俺滴模块 import name, age, foo\nprint(name) # 古明地觉\nprint(age) # 16\nprint(foo()) # 我是函数 foo 怎么样，是不是很有意思呢？相信你对名字空间已经有了足够清晰的认识，它是变量和与之绑定的对象的容身之所。","breadcrumbs":"55. 名字空间：变量的容身之所 » exec 和 eval","id":"248","title":"exec 和 eval"},"249":{"body":"名字空间是 Python 的灵魂，它规定了一个变量应该如何查找，关于变量查找，下一篇文章来详细介绍，到时你会对名字空间有更加透彻的理解。 然后是作用域，所谓名字空间其实就是作用域的动态体现。整个 py 文件是一个作用域，也是全局作用域；定义函数、定义类、定义方法，又会创建新的作用域，这些作用域层层嵌套。那么同理，运行时的名字空间也是层层嵌套的，形成一条名字空间链。内层的变量对外层是不可见的，但外层的变量对内层是可见的。 然后全局名字空间是一个字典，它是唯一的，操作里面的键值对等价于操作全局变量；至于局部名字空间则不唯一，每一个函数都有自己的局部名字空间，但我们要知道函数内部在访问局部变量的时候是静态访问的（相关细节后续聊）。 还有内置名字空间，可以通过 __builtins__ 获取，但拿到的是一个模块，再获取它的属性字典，那么就是内置名字空间了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"55. 名字空间：变量的容身之所 » 小结","id":"249","title":"小结"},"25":{"body":"至此，我们算是从解释器的角度完全理清了 Python 中对象之间的关系，用之前的一张图总结一下。 当然，目前还远远没有结束，后续还会针对内置的对象进行专门的剖析，如浮点数、整数、字符串、字节串、元组、列表、字典、集合等等，都会一点一点剖析。我们会从 Python 的角度介绍对象该怎么用，然后再看它的底层实现，最后再用 Python 代码进行验证，加深理解。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 小结","id":"25","title":"小结"},"250":{"body":"上一篇文章我们介绍了名字空间，并且知道了全局变量都存在 global 名字空间中，往 global 空间添加一个键值对相当于定义一个全局变量。那么问题来了，如果往函数的 local 空间里面添加一个键值对，是不是也等价于创建了一个局部变量呢？ def foo(): locals()[\"name\"] = \"古明地觉\" try: print(name) except Exception as e: print(e) foo() # name 'name' is not defined 全局变量的创建是通过向字典添加键值对实现的，因为全局变量会一直变，需要使用字典来动态维护。 但对于函数来讲，内部的变量是通过静态方式存储和访问的，因为局部作用域中存在哪些变量在编译的时候就已经确定了，我们通过 PyCodeObject 的 co_varnames 即可获取内部都有哪些变量。 所以，虽然我们说变量查找遵循 LGB 规则，但函数内部的变量其实是静态访问的，不过完全可以按照 LGB 的方式理解。关于这方面的细节，后续还会细说。 因此名字空间是 Python 的灵魂，它规定了变量的作用域，使得 Python 对变量的查找变得非常清晰。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 楔子","id":"250","title":"楔子"},"251":{"body":"LGB 是针对 Python2.2 之前的，而从 Python2.2 开始，由于引入了嵌套函数，所以内层函数在找不到某个变量时应该先去外层函数找，而不是直接就跑到 global 空间里面找，那么此时的规则就是 LEGB。 x = 1 def foo(): x = 2 def bar(): print(x) return bar foo()()\n\"\"\"\n2\n\"\"\" 调用了内层函数 bar，如果按照 LGB 的规则来查找的话，由于函数 bar 的作用域没有 a，那么应该到全局里面找，打印的结果是 1 才对。 但我们之前说了，作用域仅仅是由文本决定的，函数 bar 位于函数 foo 之内，所以函数 bar 定义的作用域内嵌于函数 foo 的作用域之内。换句话说，函数 foo 的作用域是函数 bar 的作用域的直接外围作用域。所以应该先从 foo 的作用域里面找，如果没有那么再去全局里面找，而作用域和名字空间是对应的，所以最终打印了 2。 另外在调用 foo() 的时候，会执行函数 foo 中的 def bar(): 语句，这个时候解释器会将 a = 2 与函数 bar 捆绑在一起，然后返回，这个捆绑起来的整体就叫做闭包。 所以：闭包 = 内层函数 + 引用的外层作用域。 而这里显示的规则就是 LEGB，其中 E 表示 Enclosing，代表直接外围作用域。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » LEGB 规则","id":"251","title":"LEGB 规则"},"252":{"body":"在初学 Python 时，估计很多人都会对下面的问题感到困惑。 x = 1 def foo(): print(x) foo()\n\"\"\"\n1\n\"\"\" 首先这段代码打印 1，这显然是没有问题的，不过下面问题来了。 x = 1 def foo(): print(x) x = 2 foo() 这段代码在执行 print(x) 的时候是会报错的，会抛出一个 UnboundLocalError: local variable 'x' referenced before assignment，意思是局部变量 x 在赋值之前就被使用了。 那么问题来了，在 print(x) 的下面加一个 x = 2，整体效果不应该是先打印全局变量 x，然后再创建一个局部变量 x 吗？为啥就报错了呢，相信肯定有人为此困惑。如果想弄明白这个错误的原因，需要深刻理解两点： 函数中的变量是静态存储、静态访问的，内部有哪些变量在编译的时候就已经确定； 局部变量在整个作用域内都是可见的； 在编译的时候，因为 x = 2 这条语句，所以知道函数中存在一个局部变量 x，那么查找的时候就会在当前局部作用域中查找，但还没来得及赋值，就 print(x) 了。换句话说，在打印 x 的时候，它还没有和某个具体的值进行绑定，所以报错：局部变量 x 在赋值之前就被使用了。 但如果没有 x = 2 这条语句则不会报错，因为知道局部作用域中不存在 x 这个变量，所以会找全局变量 x，从而打印 1。 更有趣的东西隐藏在字节码当中，我们可以通过反汇编来查看一下： import dis x = 1 def foo(): print(x) dis.dis(foo)\n\"\"\" 6 0 LOAD_GLOBAL 0 (print) 2 LOAD_GLOBAL 1 (x) 4 CALL_FUNCTION 1 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE\n\"\"\" def bar(): print(x) x = 2 dis.dis(bar) \"\"\" 19 0 LOAD_GLOBAL 0 (print) 2 LOAD_FAST 0 (x) 4 CALL_FUNCTION 1 6 POP_TOP 20 8 LOAD_CONST 1 (2) 10 STORE_FAST 0 (x) 12 LOAD_CONST 0 (None) 14 RETURN_VALUE\n\"\"\" 第二列的序号代表字节码指令的偏移量，我们看偏移量为 2 的指令，函数 foo 对应的指令是 LOAD_GLOBAL，意思是在 global 空间中查找 x。而函数 bar 的指令是 LOAD_FAST，表示在数组中静态查找 x，但遗憾的是，此时 x 还没有和某个值进行绑定。 因此结果说明 Python 采用了静态作用域策略，在编译的时候就已经知道变量藏身于何处。而且这个例子也表明，一旦函数内有了对某个变量的赋值操作，它会在整个作用域内可见，因为编译时就已经确定。换句话说，会遮蔽外层作用域中相同的名字。 我们看一下函数 foo 和函数 bar 的符号表。 x = 1 def foo(): print(x) def bar(): print(x) x = 2 print(foo.__code__.co_varnames) # ()\nprint(bar.__code__.co_varnames) # ('x',) 在编译的时候，就知道函数 bar 里面存在局部变量 x。 如果想修复这个错误，可以用之前说的 global 关键字，将变量 x 声明为全局的。 x = 1 def bar(): global x # 表示变量 x 是全局变量 print(x) x = 2 bar() # 1\nprint(x) # 2 但这样的话，会导致外部的全局变量被修改，如果不想出现这种情况，那么可以考虑直接获取全局名字空间。 x = 1 def bar(): print(globals()[\"x\"]) x = 2 bar() # 1\nprint(x) # 1 这样结果就没问题了，同样的，类似的问题也会出现在嵌套函数中。 def foo(): x = 1 def bar(): print(x) x = 2 return bar foo()() 执行内层函数 bar 的时候，print(x) 也会出现 UnboundLocalError，如果想让它不报错，而是打印外层函数中的 x，该怎么做呢？Python 同样为我们准备了一个关键字：nonlocal。 def foo(): x = 1 def bar(): # 使用 nonlocal 的时候，必须是在内层函数里面 nonlocal x print(x) x = 2 return bar foo()() # 1 如果 bar 里面是 global x，那么表示 x 是全局变量，当 foo()() 执行完毕之后，会创建一个全局变量 x = 2。但这里不是 global，而是 nonlocal，表示 x 是外部作用域中的变量，因此会打印 foo 里面的变量 x。 当然啦，既然声明为 nonlocal，那么 foo 里面的 x 肯定会受到影响。 import inspect frame = None def foo(): globals()[\"frame\"] = inspect.currentframe() x = 1 def bar(): nonlocal x # print(x) x = 2 return bar bar = foo()\n# 打印 foo 的局部变量，此时变量 x 的值为 1\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 1}\n\"\"\"\n# 调用内层函数 bar\nbar()\n# 此时 foo 的局部变量 x 的值变成了 2\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 2}\n\"\"\" 不过由于 foo 是一个函数，调用内层函数 bar 的时候，外层函数 foo 已经结束了，所以不管怎么修改它里面的变量，都无所谓了。 另外上面的函数只嵌套了两层，即使嵌套很多层也是可以的。 import inspect frame = None def a(): def b(): globals()[\"frame\"] = inspect.currentframe() x = 123 def c(): def d(): def e(): def f(): nonlocal x print(x) x = 456 return f return e return d return c return b b = a()\nc = b()\nd = c()\ne = d()\nf = e()\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 123}\n\"\"\"\n# 调用函数 f 的时候，打印的是函数 b 里面的变量 x\n# 当然，最后也会修改它\nf()\n\"\"\"\n123\n\"\"\"\n# 可以看到 x 变成了 456\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 456}\n\"\"\" 不难发现，在嵌套多层的情况下，会采用就近原则。如果函数 d 里面也定义了变量 x，那么函数 f 里面的 nonlocal x 表示的就是函数 d 里面的局部变量 x。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » global 表达式","id":"252","title":"global 表达式"},"253":{"body":"当我们访问某个变量时，会按照 LEGB 的规则进行查找，而属性查找也是类似的，本质上都是到名字空间中查找一个名字所引用的对象。但由于属性查找限定了范围，所以要更简单，比如 a.xxx，就是到 a 里面去找属性 xxx，这个规则是不受 LEGB 作用域限制的，就是到 a 里面查找，有就是有，没有就是没有。 import numpy as np # 在 np 指向的对象（模块）中查找 array 属性\nprint(np.array([1, 2, 3]))\n\"\"\"\n[1 2 3]\n\"\"\"\n# 本质上就是去 np 的属性字典中查找 key = \"array\" 对应的 value\nprint(np.__dict__[\"array\"]([11, 22, 33]))\n\"\"\"\n[11 22 33]\n\"\"\" class Girl: name = \"古明地觉\" age = 16 print(Girl.name, Girl.age)\n\"\"\"\n古明地觉 16\n\"\"\"\nprint(Girl.__dict__[\"name\"], Girl.__dict__[\"age\"])\n\"\"\"\n古明地觉 16\n\"\"\" 需要补充一点，我们说属性查找会按照 LEGB 规则，但这必须限制在自身所在的模块内，如果是多个模块就不行了。举个例子，假设有两个 py 文件，内容如下： # girl.py\nprint(name) # main.py\nname = \"古明地觉\"\nfrom girl import name 关于模块的导入我们后续会详细说，总之执行 main.py 的时候报错了，提示变量 name 没有被定义，但问题是 main.py 里面定义了变量 name，为啥报错呢？ 很明显，因为 girl.py 里面没有定义变量 name，所以导入 girl 的时候报错了。因此结论很清晰了，变量查找虽然是 LEGB 规则，但不会越过自身所在的模块。print(name) 在 girl.py 里面，而变量 name 定义在 main.py 里面，在导入时不可能跨过 girl.py 的作用域去访问 main.py 里的 name，因此在执行 from girl import name 的时候会抛出 NameError。 虽然每个模块内部的作用域规则有点复杂，因为要遵循 LEGB；但模块与模块的作用域之间则划分得很清晰，就是相互独立。 关于模块，我们后续会详细说。总之通过属性操作符 . 的方式，本质上都是去指定的名字空间中查找对应的属性。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性查找","id":"253","title":"属性查找"},"254":{"body":"自定义的类里面如果没有 __slots__，那么这个类的实例对象会有一个属性字典，和名字空间的概念是等价的。 class Girl: def __init__(self): self.name = \"古明地觉\" self.age = 16 g = Girl()\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16} # 对于查找属性而言, 也是去属性字典中查找\nprint(g.name, g.__dict__[\"name\"]) # 古明地觉 古明地觉 # 同理设置属性, 也是更改对应的属性字典\ng.__dict__[\"gender\"] = \"female\"\nprint(g.gender) # female 当然模块也有属性字典，本质上和类的实例对象是一致的，因为模块本身就是一个实例对象。 print(__builtins__.str) # <class 'str'>\nprint(__builtins__.__dict__[\"str\"]) # <class 'str'> 另外这个 __builtins__ 位于 global 名字空间里面，然后获取 global 名字空间的 globals 又是一个内置函数，于是一个神奇的事情就出现了。 print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"] ) # <module 'builtins' (built-in)> print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"].list(\"abc\") ) # ['a', 'b', 'c'] global 名字空间和 builtin 名字空间，都保存了指向彼此的指针，所以不管套娃多少次，都是可以的。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性空间","id":"254","title":"属性空间"},"255":{"body":"整个内容很好理解，关键的地方就在于局部变量，它是静态存储的，编译期间就已经确定。而在访问局部变量时，也是基于数组实现的静态查找，而不是使用字典。 关于 local 空间，以及如何使用数组实现静态查找，我们后面还会详细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 小结","id":"255","title":"小结"},"256":{"body":"当解释器启动后，首先会进行运行时环境的初始化，注意这里的运行时环境，它和之前说的执行环境有很大不同，运行时环境是一个全局的概念，而执行环境是一个栈帧。 关于运行时环境的初始化是一个很复杂的过程，涉及到 Python 进程、线程的创建，类型对象的完善等非常多的内容，我们暂时先不讨论。这里就假设初始化动作已经完成，我们已经站在了虚拟机的门槛外面，只需要轻轻推动第一张骨牌，整个执行过程就像多米诺骨牌一样，一环扣一环地展开。 在介绍字节码的时候我们说过，解释器可以看成是：编译器+虚拟机，编译器负责将源代码编译成 PyCodeObject 对象，而虚拟机则负责执行。所以我们的重点就是虚拟机是怎么执行 PyCodeObject 对象的？整个过程是什么，掌握了这些，你对虚拟机会有一个更深的理解。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 楔子","id":"256","title":"楔子"},"257":{"body":"在介绍栈帧的时候我们说过，Python 是一门动态语言，一个变量指向什么对象需要在运行时才能确定，这些信息不可能静态存储在 PyCodeObject 对象中。所以虚拟机在运行时会基于 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。而创建栈帧，主要使用以下两个函数： // Python/ceval.c /* 基于 PyCodeObject、全局名字空间、局部名字空间，创建栈帧 * 参数非常简单，所以它一般适用于模块这种参数不复杂的场景 * 前面说了，模块也会对应一个栈帧，并且它位于栈帧链的最顶层 */\nPyObject *\nPyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)\n{ return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, (PyObject **)NULL, 0, (PyObject **)NULL, 0, NULL, NULL);\n} /* 相比 PyEval_EvalCode 多了很多的参数 * 比如里面有位置参数以及个数，关键字参数以及个数 * 还有默认参数以及个数，闭包等等，显然它用于函数等复杂场景 */\nPyObject *\nPyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, int argcount, PyObject *const *kws, int kwcount, PyObject *const *defs, int defcount, PyObject *kwdefs, PyObject *closure)\n{ return _PyEval_EvalCodeWithName(_co, globals, locals, args, argcount, kws, kws != NULL ? kws + 1 : NULL, kwcount, 2, defs, defcount, kwdefs, closure, NULL, NULL);\n} 我们看到 PyEval_EvalCode 也是调用了 PyEval_EvalCodeEx，后者是通用逻辑，只不过为模块创建栈帧时，参数非常简单，所以又封装了 PyEval_EvalCode 函数。 当然啦，上面这两个函数最终都会调用 _PyEval_EvalCodeWithName 函数，创建并初始化栈帧对象，我们来看一下该函数内部的逻辑。 // Python/ceval.c PyObject *\n_PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, Py_ssize_t argcount, PyObject *const *kwnames, PyObject *const *kwargs, Py_ssize_t kwcount, int kwstep, PyObject *const *defs, Py_ssize_t defcount, PyObject *kwdefs, PyObject *closure, PyObject *name, PyObject *qualname)\n{ PyCodeObject* co = (PyCodeObject*)_co; PyFrameObject *f; PyObject *retval = NULL; PyObject **fastlocals, **freevars; // ... // 调用 _PyFrame_New_NoTrack 函数创建栈帧 f = _PyFrame_New_NoTrack(tstate, co, globals, locals); if (f == NULL) { return NULL; } fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; // ... // 调用 PyEval_EvalFrameEx 在栈帧中执行字节码 retval = PyEval_EvalFrameEx(f,0); fail: assert(tstate != NULL); if (Py_REFCNT(f) > 1) { Py_DECREF(f); _PyObject_GC_TRACK(f); } else { ++tstate->recursion_depth; Py_DECREF(f); --tstate->recursion_depth; } return retval;\n} 这个函数的逻辑比较长，但做的事情很简单。 调用 _PyFrame_New_NoTrack 函数创建栈帧，并初始化内部字段。 栈帧创建完毕之后，里面的字段都是初始值，所以还要基于当前的 PyCodeObject 对象、位置参数、关键字参数、参数个数等信息修改栈帧字段，而省略掉的大部分代码就是在负责相关逻辑。以上这两步组合起来，就是我们之前说的基于 PyCodeObject 对象构建栈帧对象。 栈帧字段设置完毕之后，调用 PyEval_EvalFrameEx 函数，在栈帧中执行字节码。 当然，PyEval_EvalFrameEx 也不是整个流程的终点，它内部还调用了一个函数。 // Python/ceval.c PyObject *\nPyEval_EvalFrameEx(PyFrameObject *f, int throwflag)\n{ // interp 表示进程状态对象，它的 eval_frame 字段被设置为 _PyEval_EvalFrameDefault // 这个 _PyEval_EvalFrameDefault 函数便是虚拟机运行的核心，是一个代码量超级多的函数 PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE(); return interp->eval_frame(f, throwflag);\n} 所以整个流程很清晰了，我们画一张图。 所以 _PyEval_EvalFrameDefault 函数是虚拟机运行的核心，该函数较为复杂，我们会在下一篇文章中分析它的具体实现。至于本篇文章就先从宏观的角度来描述一下虚拟机执行字节码的流程，并对之前的内容做一个补充，将背后涉及的概念阐述一遍，这样后续看源码的时候也会事半功倍。 首先栈帧中有一个 f_code 字段，它指向 PyCodeObject 对象，该对象的 co_code 字段则保存着字节码指令序列。而虚拟机执行字节码就是从头到尾遍历整个 co_code，对指令逐条执行的过程。 另外也不要觉得字节码指令（简称指令）有多神秘，说白了它就是个 uint8 整数，而一个程序肯定会包含多条指令，它们整体便构成了指令集，或者说指令序列。那么显然，使用 bytes 对象来表示指令序列再合适不过了，如果站在 C 的角度，则就是一个普普通通的字符数组，一条指令就是一个字符、或者说一个整数。 当然指令序列里面包含的不仅仅是指令，还有指令参数，因为每个指令都会带一个参数。因此索引为 0 2 4 6 8 ··· 的整数表示指令，索引为 1 3 5 7 9 ··· 的整数表示指令参数。 我们用 Python 来演示一下： code_string = \"\"\"\na = 1\nb = 2\nc = a + b\n\"\"\" code_object = compile(code_string, \"<file>\", \"exec\")\n# 查看常量池\nprint(code_object.co_consts)\n\"\"\"\n(1, 2, None)\n\"\"\"\n# 查看符号表\nprint(code_object.co_names)\n\"\"\"\n('a', 'b', 'c')\n\"\"\" 这些都比较简单，再来看一下反编译的结果，直接 dis.dis(code_object) 即可。 /* 常量池：(1, 2, None) * 符号表：('a', 'b', 'c') */ // 第一列表示源代码行号\n// 第二列表示指令的偏移量\n// 第三列表示指令，在 C 中它们都是宏，对应一个整数\n// 第四列表示指令参数\n// 第五列是 dis 模块为了方便我们阅读而补充的提示信息 // 指令：LOAD_CONST，指令参数：0\n// 表示从常量池中加载索引为 0 的常量，并压入运行时栈（关于运行时栈，一会儿详细说明）\n// 索引为 0 的常量显然是 1，而括号里面的提示信息显示的也是 1\n2 0 LOAD_CONST 0 (1)\n// 指令：STORE_NAME，指令参数：0\n// 表示从符号表中加载索引为 0 的符号，显然结果是 \"a\"\n// 然后弹出运行时栈的栈顶元素，显然是上一条指令压入的 1\n// 将 \"a\" 和 1 组成键值对，存储在当前的名字空间中\n// 到此 a = 1 这条语句便完成了，或者说完成了变量和值的绑定 2 STORE_NAME 0 (a) // 从常量池中加载索引为 1 的常量（结果是 2），并压入运行时栈 3 4 LOAD_CONST 1 (2)\n// 从符号表中加载索引为 1 的符号（结果是 \"b\")\n// 然后从栈顶弹出元素 2，将 \"b\" 和 2 绑定起来 6 STORE_NAME 1 (b) // 加载符号表中索引为 0 的符号对应的值，并压入运行时栈 4 8 LOAD_NAME 0 (a)\n// 加载符号表中索引为 1 的符号对应的值，并压入运行时栈 10 LOAD_NAME 1 (b)\n// 将运行时栈的两个元素弹出，并执行加法运算\n// 运算之后，再将结果 a + b 压入运行时栈 12 BINARY_ADD\n// 从符号表中加载索引为 2 的符号，结果是 \"c\" // 将运行时栈的栈顶元素弹出，这里是 a + b 的运算结果\n// 然后进行绑定，完成 c = a + b 这条赋值语句 14 STORE_NAME 2 (c)\n// 从常量池中加载索引为 2 的元素并返回，有一个隐式的 return None 16 LOAD_CONST 2 (None) 18 RETURN_VALUE 这些指令的源码实现后续都会说，但是不难发现，程序的主干逻辑都体现在字节码中，而依赖的信息则由其它字段来维护。所谓执行源代码，其实就是虚拟机执行编译之后的字节码，通过遍历 co_code，对不同的指令执行不同的逻辑。 然后我们基于上面这些输出信息，看看能否将字节码指令集还原出来，当然在还原之前首先要知道这些指令代表的数值是多少。 下面我们来进行还原。 \"\"\" 0 LOAD_CONST 0 (1) 2 STORE_NAME 0 (a) 4 LOAD_CONST 1 (2) 6 STORE_NAME 1 (b) 8 LOAD_NAME 0 (a)\n10 LOAD_NAME 1 (b)\n12 BINARY_ADD\n14 STORE_NAME 2 (c)\n16 LOAD_CONST 2 (None)\n18 RETURN_VALUE\n\"\"\"\nBINARY_ADD = 23\nRETURN_VALUE = 83\nSTORE_NAME = 90\nLOAD_CONST = 100\nLOAD_NAME = 101 codes = [ # a = 1 LOAD_CONST, 0, STORE_NAME, 0, # b = 2 LOAD_CONST, 1, STORE_NAME, 1, # c = a + b LOAD_NAME, 0, # 加载 a LOAD_NAME, 1, # 加载 b BINARY_ADD, 0, # 计算 a + b STORE_NAME, 2, # 和变量 c 绑定 # 所有代码块都隐式地包含了一个 return None LOAD_NAME, 2, RETURN_VALUE, 0\n]\nprint(bytes(codes))\n\"\"\"\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02e\\x02S\\x00'\n\"\"\" 那么字节码是不是我们还原的这个样子呢？来对比一下。 >>> code_object.co_code\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02d\\x02S\\x00' 结果是一样的，到此相信你对 Python 源代码的执行过程应该有更深的了解了，简单来讲，其实就是以下几个步骤。 1）源代码被编译成 PyCodeObject 对象，该对象的 co_code 字段指向字节码指令序列，它包含了程序执行的主干逻辑，剩余字段则保存常量池、符号表等其它静态信息。 2）虚拟机在 PyCodeObject 对象的基础上构建栈桢对象。 3）虚拟机在栈桢对象内部执行字节码（帧评估），具体流程就是遍历指令集和，根据不同指令执行不同的处理逻辑，而这一过程便由 _PyEval_EvalFrameDefault 函数负责完成。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 虚拟机的运行框架","id":"257","title":"虚拟机的运行框架"},"258":{"body":"之前一直提到一个概念，叫运行时栈，那什么是运行时栈呢？别急，我们先来回顾一下栈桢的基本结构。 大部分字段都很好理解，因为之前通过 Python 代码演示过。但有几个字段是虚拟机用于执行指令的，后续会遇到，所以这里再拿出来解释一下。 f_lasti 上一条刚执行完的字节码指令的偏移量，因为每个指令要带一个参数，所以当虚拟机要执行偏移量为 n 的指令时，那么 f_lasti 就是 n - 2。当然，如果字节码还没有开始执行，那么 f_lasti 为 -1。 f_localsplus 一个柔性数组，它的内存大小被分为 4 个部分。 注：f_localsplus 是一个数组，所以它是一段连续的内存，只不过按照用途被分成了 4 个部分。如果用新一团团长丁伟的说法：每个部分之间是鸡犬相闻，但又老死不相往来。 然后再着重强调一下运行时栈，虚拟机在执行字节码指令时高度依赖它，因为一个指令只能带一个参数，那么剩余的参数就必须通过运行时栈给出。比如 a = 1 会对应两条字节码：LOAD_CONST 和 STORE_NAME。 STORE_NAME 的作用是从符号表中获取符号，或者说变量名，然后和值绑定起来。而要加载符号，那么必须要知道它在符号表中的索引，显然这可以通过指令参数给出，但问题是与之绑定的值怎么获取？毫无疑问，要通过运行时栈。因此 LOAD_CONST 将值读取进来之后，还要压入运行时栈，然后 STORE_NAME 会将值从运行时栈中弹出，从而完成符号（变量）和值的绑定。 关于运行时栈，我们再看个复杂的例子： 偏移量为 6 的指令表示要构建一个字典，指令参数 2 表示构建的字典的长度为 2，但问题是字典的键值对在什么地方？显然它们已经被提前压入了运行时栈，执行 BUILD_CONST_KEY_MAP 的时候直接弹出即可。 所以这就是运行时栈的作用，如果某个指令需要 n 个参数，那么其中的 n - 1 个必须要提前压入运行时栈，然后在该指令执行的时候依次弹出，因为一个指令只能带一个参数。 f_stacktop 一个指针，指向运行时栈的栈顶。由于运行时栈存储的都是 PyObject *，所以 f_stacktop 的类型是 PyObject **。当然在源码中没有直接操作 f_stacktop 字段，而是定义了一个变量 stack_pointer，它初始等于 f_stacktop。后续操作的都是 stack_pointer，当然操作完之后，还要重新赋值给 f_stacktop。 所以 stack_pointer 始终指向运行时栈的栈顶，而元素的入栈和出栈，显然都是通过操作 stack_pointer 完成的。 执行 *stack_pointer++ = v，一个元素就入栈了。 执行 v = *--stack_pointer，一个元素就出栈了。 而随着元素的入栈和出栈，运行时栈的栈顶、或者说 stack_pointer 也在不断变化，但无论如何，stack_pointer 始终指向运行时栈的栈顶。当然啦，由于栈顶发生变化，后续还要对 f_stacktop 进行更新。 f_valuestack 一个指针，指向运行时栈的栈底。 另外我们说 f_localsplus 数组被分成了 4 份，最后一份给了运行时栈，因此虽然我们称之为栈，但它其实就是一个数组，而且还是数组的一部分。 而对于数组而言，内存地址从左往右是增大的。 这是 f_localsplus 的示意图，灰色区域表示运行时栈之前的部分，这里我们只看运行时栈，目前栈里面有两个元素，stack_pointer 指向栈顶。 这时如果要添加一个元素 3，那么直接 *stack_pointer++ = 3 即可。 如果要将栈顶元素弹出，那么执行 v = *--stack_pointer 即可。 还是比较清晰的，不过还没结束，我们还要继续探讨运行时栈。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 什么是运行时栈","id":"258","title":"什么是运行时栈"},"259":{"body":"相信你已经知道什么是运行时栈了，说白了它就是参数的容身之所，比如虚拟机在执行 a + b 的时候，通过指令和指令参数可以判断这是一个加法操作，但在执行加法的时候，加号两边的值要怎么获取呢？这时候就需要一个栈来专门保存相应的参数。在执行加法之前，先将 a 和 b 压入栈中，等执行加法的时候，再将 a 和 b 从栈里面弹出来即可，非常简单。 然后再来看看和运行时栈相关的一些宏，并加深对运行时栈的理解。 // Python/ceval.c #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))\n#define EMPTY() (STACK_LEVEL() == 0)\n#define TOP() (stack_pointer[-1])\n#define SECOND() (stack_pointer[-2])\n#define THIRD() (stack_pointer[-3])\n#define FOURTH() (stack_pointer[-4])\n#define PEEK(n) (stack_pointer[-(n)])\n#define SET_TOP(v) (stack_pointer[-1] = (v))\n#define SET_SECOND(v) (stack_pointer[-2] = (v))\n#define SET_THIRD(v) (stack_pointer[-3] = (v))\n#define SET_FOURTH(v) (stack_pointer[-4] = (v))\n#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))\n#define BASIC_STACKADJ(n) (stack_pointer += n)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v))\n#define BASIC_POP() (*--stack_pointer) #define PUSH(v) BASIC_PUSH(v)\n#define POP() BASIC_POP()\n#define STACK_GROW(n) BASIC_STACKADJ(n)\n#define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER)) 宏还是比较多的，我们来逐一介绍。假设目前运行时栈内部有三个元素，从栈底到栈顶分别是整数 1、2、3，那么运行时栈的结构就是下面这样。 f_localsplus 数组被分成 4 个区域，运行时栈占据最后一个，因此图中的灰色区域便是运行时栈之前的内存。由于我们是研究运行时栈，所以这部分区域后续就不再画了。 然后看一下这些和运行时栈相关的宏都是干嘛的。 STACK_LEVEL() 返回运行时栈的元素个数，显然直接让栈顶指针和栈底指针相减就完事了。 #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack)) 所以 STACK_LEVEL() 是会动态变化的，因为 stack_pointer 会动态变化。 记得之前在介绍 PyCodeObject 时，我们说它内部的 co_stacksize 字段表示执行代码块所需要的栈空间，而这个栈空间就是运行时栈的长度。当然也可以理解为要想执行这段代码块，后续创建栈桢时，应该给 f_localsplus 数组中表示运行时栈的区域分配能存储多少个元素的内存。 比如 co_stacksize 是 1，那么表示应该给运行时栈分配能存储 1 个元素的内存，即运行时栈的长度为 1。 STACK_LEVEL() 表示当前运行时栈已存储的元素数量，而 co_stacksize 表示运行时栈的长度，即最多能存储多少个元素。 我们通过反编译的方式，实际演示一下。 import dis def some_func(): a = 1 b = 2 c = 3 # 这里只保留字节码指令\ndis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 也就是说，运行时栈只要能容纳一个元素，即可执行这段代码\nprint(some_func.__code__.co_stacksize) # 1 我们再来看个例子。 import dis def some_func(): a = 1 b = 2 c = 3 lst = [a, b, c] dis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 1\nLOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 2 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 3\nBUILD_LIST # 将栈里的三个元素弹出，构建列表并入栈（此时元素个数为 1）\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 不难看出，要想执行这段代码，运行时栈要能容纳 3 个元素\nprint(some_func.__code__.co_stacksize) # 3 相信你现在应该理解 co_stacksize 的作用了，它表示运行时栈最多能容纳多少个元素，也就是运行时栈的长度。以上面代码为例，由于最多会压入 3 个元素，所以运行时栈的长度就是 3，即最多能容纳 3 个元素。并且这个长度在编译之后就已经确定了，因为可以通过遍历指令集静态计算出来。 我们画一张图描述一下上面的代码在执行时，运行时栈的变化过程。 整个过程应该很清晰，当然上面只是运行时栈的变化，f_localsplus 中存储局部变量的内存区域也在变化。另外如果代码块位于全局作用域，那么变化的就是全局名字空间，相关细节后续详细展开。 EMPTY() #define EMPTY() (STACK_LEVEL() == 0) 判断运行时栈是否为空，显然只需判断运行时栈的元素个数是否为 0 即可。 TOP() #define TOP() (stack_pointer[-1]) 查看当前运行时栈的栈顶元素。 SECOND() #define SECOND() (stack_pointer[-2]) 查看从栈顶元素开始的第二个元素。 THIRD() #define THIRD() (stack_pointer[-3]) 查看从栈顶元素开始的第三个元素。 FOURTH() #define FOURTH() (stack_pointer[-4]) 查看从栈顶元素开始的第四个元素。 PEEK(n) #define PEEK(n) (stack_pointer[-(n)]) 查看从栈顶元素开始的第 n 个元素。 SET_TOP(v) #define SET_TOP(v) (stack_pointer[-1] = (v)) 将当前运行时栈的栈顶元素设置成 v。 SET_SECOND(v) #define SET_SECOND(v) (stack_pointer[-2] = (v)) 将从栈顶元素开始的第二个元素设置成 v。 SET_THIRD(v) #define SET_THIRD(v) (stack_pointer[-3] = (v)) 将从栈顶元素开始的第三个元素设置成 v。 SET_FOURTH(v) #define SET_FOURTH(v) (stack_pointer[-4] = (v)) 将从栈顶元素开始的第四个元素设置成 v。 SET_VALUE(n, v) #define SET_VALUE(n, v) (stack_pointer[-(n)] = (v)) 将从栈顶元素开始的第 n 个元素设置成 v。 PUSH(v) #define PUSH(v) BASIC_PUSH(v)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v)) 往运行时栈中压入一个元素，并且压入之后，栈中已存储的元素个数一定不超过 co_stacksize。假设当前栈里有一个元素 1，然后添加一个元素 2。 Python 的变量都是一个指针，所以 stack_pointer 是一个二级指针，它永远指向栈顶位置，只不过栈顶位置会变。另外要注意：运行时栈的内存一开始就申请好了，初始状态下，里面的元素全部为 NULL。而往栈里面压入一个元素，其实就是修改 stack_pointer 指向的内存单元，然后执行 stack_pointer++。 POP() #define POP() BASIC_POP()\n#define BASIC_POP() (*--stack_pointer) 弹出栈顶元素，注意它和 TOP 的区别，TOP 是返回栈顶元素，但不弹出。 stack_pointer 指向栈顶位置，所以它向栈底移动一个位置，就相当于元素被弹出了。 关于弹出元素需要做一个说明，所谓弹出元素本质上就是将 stack_pointer 向栈底移动一个位置。我们看一下上图，一开始栈里面有两个元素，分别是整数 1 和整数 2，当然准确来说应该是指向它们的指针，但为了描述方便，我们就用对象本身代替了。 然后执行 POP()，将整数 2 弹出，但我们发现 POP() 之后，整数 2 还在栈里面。关于这一点很好理解，因为 stack_pointer 始终指向栈顶位置，而它向栈底移动了一个位置，那么整数 2 就已经不是栈顶元素了。当下一个元素入栈时，会把整数 2 替换掉。因此虽然整数 2 还在运行时栈里面，但和不在没有任何区别，此时我们依旧认为整数 2 被弹出了。 不过在后续的文章中，在画运行时栈的时候，我们也会这么画。 为了阅读清晰，stack_pointer 之后的元素就不写了。另外还要注意一点，运行时栈的内存一开始就已经申请好了，是固定的，弹出元素只是改变栈顶指针 stack_pointer 的指向，而内存区域的大小是不变的。 当然这些内容都比较简单，但为了避免出现歧义，这里单独解释一下。 STACK_GROW(n) #define STACK_GROW(n) BASIC_STACKADJ(n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 改变运行时栈的栈顶，注：运行时栈的大小是固定的，但栈顶是由 stack_pointer 决定的。 那么问题来了，假设要往运行时栈压入两个元素，分别是 2、3，该怎么做呢？首先肯定可以通过 PUSH 实现。 PUSH(2);\nPUSH(3); 但如果不让你用 PUSH，该怎么做呢？ STACK_GROW(2);\n// 设置元素\nSET_VALUE(1, 3); // stack_pointer[-1] = 3\nSET_VALUE(2, 2); // stack_pointer[-2] = 2 两种做法都是可以的。 STACK_SHRINK(n) #define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 它的作用和 STACK_GROWN 正好相反。 注意：STACK_SHRINK(3) 之后，stack_pointer 和 f_valuestack 都指向了运行时栈的栈底，同时也是栈顶。还是之前说的，栈空间是固定的，但栈顶会随着元素的入栈和出栈而动态变化。 另外，对于当前示例来说，如果你不关注栈里的元素的话，那么执行 STACK_SHRINK(3) 和执行三次 POP() 是等价的。当然不管是哪种情况，最终栈里的元素都还是 1、2、3，因为弹出元素只是改变栈顶指针 stack_pointer 的指向，而不会修改栈里的元素。当然啦，既然栈顶是由 stack_pointer 决定的，而它目前指向了栈底位置，所以我们可以认为此时栈是空的。 这么画似乎更清晰一些，但我们要知道这背后的整个过程。另外还要再次强调，运行时栈只是数组 f_localsplus 的一部分，并且是最后一部分，所以它的内存空间事先就申请好了，里面的每个元素都是 NULL。所谓添加元素，就是修改 stack_pointer 指针指向的内存，然后 stack_pointer++。所谓弹出元素，就是 stack_pointer--，然后返回 stack_pointer 指向的内存。 以上就是运行时栈的一些宏，后续阅读源码的时候，会经常遇到。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 运行时栈的一些宏","id":"259","title":"运行时栈的一些宏"},"26":{"body":"本篇文章来聊一聊对象的创建，一个对象是如何从无到有产生的呢？ >>> n = 123\n>>> n\n123 比如在终端中执行 n = 123，一个整数对象就创建好了，但它的背后都发生了什么呢？带着这些疑问，开始今天的内容。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"26","title":"楔子"},"260":{"body":"本篇文章我们就从宏观的角度介绍了虚拟机执行字节码的流程，说白了虚拟机就是把自己当成一个 CPU，在栈桢中执行指令。通过遍历字节码指令集，对不同的指令执行不同的处理逻辑。 然后是运行时栈，因为一个指令只能带一个参数，那么剩余的参数就需要通过运行时栈给出。比如 LOAD_CONST 指令，它在加载完常量之后，会将常量压入运行时栈，然后 STORE_NAME 或 STORE_FAST 指令再将常量从运行时栈的顶部弹出，并和某个符号（变量）绑定起来。 关于这些指令，我们后面会详细说。 最后我们介绍了运行时栈的一些宏，因为执行指令的时候会反复操作运行时栈，所以底层封装了很多的宏。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 小结","id":"260","title":"小结"},"261":{"body":"上一篇文章我们介绍了虚拟机是怎么执行字节码指令的，并且还介绍了运行时栈，以及操作运行时栈的一些宏。相信你对字节码执行的整个流程应该有了清晰的认识，那么接下来我们就深入到源码中，进一步考察执行过程。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 楔子","id":"261","title":"楔子"},"262":{"body":"之前说了，虚拟机就是把自己当成一个 CPU，在栈帧中执行字节码，面对不同的字节码指令，执行不同的处理逻辑。 具体实现由 Python/ceval.c 中的 _PyEval_EvalFrameDefault 函数负责，该函数超级长，并且里面还包含了大量的宏，这些宏完全可以定义在其它的文件中。像我们之前介绍的操作运行时栈的宏，也定义在 _PyEval_EvalFrameDefault 函数里面了。所以为了方便大家理解，我决定先介绍里面出现的宏，等宏说完了之后再看具体的逻辑。 #ifdef HAVE_COMPUTED_GOTOS #ifndef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 1 #endif\n#else #if defined(USE_COMPUTED_GOTOS) && USE_COMPUTED_GOTOS #error \"Computed gotos are not supported on this compiler.\" #endif #undef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 0\n#endif // 如果使用 \"计算跳转\"，导入静态跳转表\n#if USE_COMPUTED_GOTOS\n/* Import the static jump table */\n#include \"opcode_targets.h\" 里面出现了一个关键词：计算跳转，这是什么意思呢？ 首先 _PyEval_EvalFrameDefault（后续简称为帧评估函数）的代码量虽然很大，但它的核心不难理解，就是循环遍历字节码指令集，处理每一条指令。而当一条指令执行完毕时，虚拟机会有以下三种动作之一： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，比如执行 GET_ITER 指令，但对象不具备可迭代的性质。那么要进行异常处理（或者直接抛出异常），然后退出帧评估函数。 执行下一条指令。 前面两种动作没啥好说的，关键是第三种，如何执行下一条指令。首先虚拟机内部有一个巨型的 switch 语句，伪代码如下： int opcode;\nint oparg; for (;;) { // 循环遍历指令集，获取指令和指令参数 opcode = ...; // 指令 oparg = ...; // 指令参数 // 执行对应的处理逻辑 switch (opcode) { case LOAD_CONST: 处理逻辑; case LOAD_FAST: 处理逻辑; case LOAD_FAST: 处理逻辑; case BUILD_LIST: 处理逻辑; case DICT_UPDATE: 处理逻辑; // ... }\n} 一个 case 分支，对应一个字节码指令的实现，由于指令非常多，所以这个 switch 语句也非常庞大。然后遍历出的指令，会进入这个 switch 语句进行匹配，执行相应的处理逻辑。所以循环遍历 co_code 得到字节码指令，然后交给内部的 switch 语句、执行匹配到的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 其实到这里，你应该已经了解了帧评估函数的整体结构。说白了就是将自己当成一个 CPU，在栈帧中执行一条条指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。因此在虚拟机的执行流程进入了那个巨大的 for 循环，并取出第一条字节码指令交给里面的 switch 语句之后，第一张多米诺骨牌就已经被推倒，命运不可阻挡的降临了。一条接一条的指令如同潮水般涌来，浩浩荡荡，横无际涯。 虽然在概念上很好理解，但很多细节被忽略掉了，本篇文章就将它们深挖出来。还是之前的问题，当一个指令执行完毕时，怎么执行下一条指令。 估计有人对这个问题感到奇怪，在 case 分支的内部加一行 continue 进行下一轮循环不就行了吗？没错，这种做法是行得通的，但存在性能问题。因为 continue 会跳转到 for 循环所在位置，所以遍历出下一条指令之后，会再次进入 switch 语句进行匹配。尽管逻辑上是正确的，但 switch 里面有数百个 case 分支，如果每来一个指令，都要顺序匹配一遍的话，那么效率必然不高。 而事实上整个字节码指令集是已知的，所以不管执行哪个指令，我们都可以提前得知它的下一个指令，只需将指针向后偏移两个字节即可。 那么问题来了，既然知道下一条要执行的指令是什么，那么在当前指令执行完毕时，可不可以直接跳转到下一条指令对应的 case 分支中呢？ 答案是可以的，这个过程就叫做计算跳转，通过标签作为值即可实现。关于什么是标签作为值，我们用一段 C 代码解释一下。 #include <stdio.h> void label_as_value(int jump) { int num = 4; void *label; switch (num) { case 1: printf(\"%d\\n\", 1); break; // 在 case 2 分支里面定义了一个标签叫 two case 2: two: { printf(\"%d\\n\", 2); break; } // 在 case 3 分支里面定义了一个标签叫 three case 3: three: { printf(\"%d\\n\", 3); break; } case 4: printf(\"%d\\n\", 4); // 如果参数 jump 等于 2，保存 two 标签的地址 // 如果参数 jump 等于 3，保存 three 标签的地址 if (jump == 2) label = &&two; else if (jump == 3) label = &&three; // 跳转到指定标签 goto *label; default: break; }\n} int main() { label_as_value(2); // 4 // 2 label_as_value(3); // 4 // 3\n} 由于变量 num 等于 4，所以会进入 case 4 分支，在里面有一个 goto *label。如果你对 C 不是特别熟悉的话，估计会有些奇怪，觉得不应该是 goto label 吗？如果是 goto label，那么需要显式地定义一个名为 label 的标签，但这里并没有。我们的目的是跳转到 two 标签或 three 标签，具体跳转到哪一个，则由参数控制。因此可以使用 && 运算符，这是 GCC 的一个扩展特性，叫做标签作为值，它允许我们获取标签的地址作为一个值。 所以在开头声明了一个 void *label，然后让 label 保存标签地址，再通过 goto *label 跳转到指定标签。由于 *label 代表哪个标签是在运行时经过计算才能知晓，因此称为计算跳转（在运行时动态决定跳转目标）。 注意：goto *&&标签名 属于高级的、非标准的 C 语言用法。 那么毫无疑问，解释器也一定为处理指令的 case 分支定义了相应的标签，并拿到了这些标签的地址。没错，这些标签地址位于 Python/opcode_targets.h 中，这个 opcode_targets.h 就是上面的帧评估函数导入的头文件。 每个指令的处理逻辑都会对应一个标签，这些标签的地址全部保存在了数组中，执行帧评估函数时导入进来即可。这里可能有人会问，导入数组时，它里面的标签都还没有定义吧。确实如此，不过没关系，对于 C 来说，标签只要定义了，那么它在函数的任何一个位置都可以使用。 假设要执行的下一条指令为 opcode，那么就会跳转到 *opcode_targets[opcode]，因此我们有理由相信，指令和 opcode_targets 数组的索引之间存在某种关联。而这种关联也很好想，opcode_targets[opcode] 指向的标签，其内部的逻辑就是用来处理 opcode 指令的，我们来验证一下。 #define LOAD_CONST 100\n#define LOAD_NAME 101 比如 LOAD_CONST 的值为 100，那么 opcode_targets[100] 肯定会指向 TARGET_LOAD_CONST 标签；LOAD_NAME 的值为 101，那么 opcode_targets[101] 肯定会指向 TARGET_LOAD_NAME 标签。 结果没有问题，其它指令也是一样的，通过计算跳转，可以直接 goto 到指定的标签。 好，我们总结一下，首先帧评估函数内部有一个巨型的 switch，每一个指令的处理逻辑都对应一个 case 分支，由于指令有一百多个，所以 case 分支也有一百多个。而当指令进入 switch 后，显然会顺序匹配这一百多个 case 分支，找到符合条件的那一个。 整个过程的逻辑是没问题的，但效率上还可以更进一步优化，因为整个字节码指令集是已知的，既然都提前知道了下一条待处理的指令是什么，那完全可以直接跳转到对应的 case 分支中。所以每个 case 分支都会对应一个标签，我们看一下源码。 这个 TARGET 是一个宏，也定义在帧评估函数中。 #define TARGET(op) \\ op: \\ TARGET_##op // 所以 case TARGET(LOAD_CONST): 展开之后就会变成\n// case LOAD_CONST: TARGET_LOAD_CONST: 所以在指令的名称前加一个 TARGET_ 就是对应的标签，比如下一条要执行的指令是 YIELD_VALUE，它等于 86，那么 opcode_targets[86] 就等于 &&TARGET_YIELD_VALUE，指向的标签内部便是 YIELD_VALUE 的处理逻辑，至于其它指令也是同理。 因此读取完下一条指令之后，就不用跳转到开头重新走一遍 switch 了。而是将指令作为索引，从 opcode_targets 拿到标签地址直接跳转即可，并且跳转后的标签内部的逻辑就是用来处理该指令的。 所以底层为每个指令的处理逻辑都定义了一个标签，而标签的地址在数组中的索引，和要处理的指令本身是相等的。 不过要想实现计算跳转，需要 GCC 支持标签作为值这一特性，即 goto *标签地址，至于标签地址是哪一个标签的地址，则在运行时动态计算得出。比如 opcode_targets[opcode] 指向哪个标签无从得知，这取决于 opcode 的值。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 以上就是计算跳转，我们继续往下说。 // 如果使用了计算跳转\n#define FAST_DISPATCH() \\ { \\ if (!_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \\ f->f_lasti = INSTR_OFFSET(); /* 将当前指令的偏移量赋值给 f_lasti */ \\ NEXTOPARG(); /* 获取下一条指令 */ \\ goto *opcode_targets[opcode]; /* 跳转到对应的标签中 */ \\ } \\ goto fast_next_opcode; \\ } #define DISPATCH() \\ { \\ if (!_Py_atomic_load_relaxed(eval_breaker)) { \\ FAST_DISPATCH(); \\ } \\ continue; \\ } #define TARGET(op) \\ op: \\ TARGET_##op // 如果不使用计算跳转\n#define TARGET(op) op\n#define FAST_DISPATCH() goto fast_next_opcode\n#define DISPATCH() continue 每条指令在执行的最后，都会调用 DISPATCH() 或 FAST_DISPATCH()，我们看一下源码。 如果不使用计算跳转，那么 DISPATCH() 就等价于 continue，直接进行下一轮 for 循环，然后进入 switch。而 FAST_DISPATCH() 会跳转到 fast_next_opcode 标签，该标签定义在 for 循环的里面，switch 的外面，所以它虽然不用从 for 循环的位置开始执行，但依然要走一遍完整的 switch。另外由于不使用计算跳转，那么 case 分支里的标签也就没意义了，所以 case TARGET(op) 就等价于 case op。 如果使用计算跳转，那么就是之前说的那样，在指令执行完之后（并且没有中断请求）会调用 NEXTOPARG() 获取下一条指令，然后通过 goto *opcode_targets[opcode] 实现计算跳转，直接跳到下一条指令对应的 case 分支中，从而省去了匹配的时间。 好，我们继续往下看。 // 获取元组 v 中索引为 i 的元素\n#define GETITEM(v, i) PyTuple_GetItem((v), (i)) /* 在遍历字节码指令序列时，会用到以下两个变量 * first_instr：永远指向字节码指令序列的第一条指令 * next_instr：永远指向下一条待执行（或正在执行）的字节码指令 * 另外由于每条字节码指令都会带有一个参数 * 所以 first_instr 和 next_instr 的类型都是 _Py_CODEUNIT *，即 uint16_t * * 其中前 8 位表示指令，后 8 位表示指令参数 */ // 在调用 NEXTOPARG() 之前，next_instr 指向正在执行的字节码指令\n// 如果调用了 NEXTOPARG()，那么 next_instr 就会指向下一条待执行的字节码指令\n// 该宏计算的显然就是它和第一条指令（或者说字节码指令序列的起始位置）之间的偏移量\n#define INSTR_OFFSET() \\ (sizeof(_Py_CODEUNIT) * (int)(next_instr - first_instr)) // 获取 next_instr 指向的 uint16 的前 8 位和后 8 位，也就是拿到指令和指令参数\n// 然后执行 next_instr++\n#define NEXTOPARG() do { \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ } while (0) 通过 INSTR_OFFSET 和 NEXTOPARG，我们介绍了两个指针变量：first_instr 和 next_instr，虚拟机就是通过它们来完成遍历的。 #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个指令等到介绍 if 控制流的时候再说，不过相信你也能猜到它是做什么的，if 控制流的某个分支如果不满足条件，就会跳到下一个分支。而这个跳转过程是怎么实现的呢？显然要借助于这里的 JUMPTO 和 JUMPBY。 // 指令预测\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif\n#define PREDICTED(op) PRED_##op: PREDICT 宏和指令预测相关，后续介绍 if 控制流的时候再说。 关于宏就说到这里，至于剩下的一些宏，暂时就先不用看了，我们在后续的部分才会用到它们。 好，既然宏说完了，接下来我们可以看整个帧评估函数都做些什么了，代码有删减。 PyObject* _Py_HOT_FUNCTION\n_PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)\n{ // 初始化一些变量，它们的含义等赋值的时候再说 PyObject **stack_pointer; const _Py_CODEUNIT *next_instr; int opcode; int oparg; PyObject **fastlocals, **freevars; PyObject *retval = NULL; _PyRuntimeState * const runtime = &_PyRuntime; PyThreadState * const tstate = _PyRuntimeState_GetThreadState(runtime); struct _ceval_runtime_state * const ceval = &runtime->ceval; _Py_atomic_int * const eval_breaker = &ceval->eval_breaker; PyCodeObject *co; int instr_ub = -1, instr_lb = 0, instr_prev = -1; const _Py_CODEUNIT *first_instr; PyObject *names; PyObject *consts; _PyOpcache *co_opcache; // ... // 省略了一堆的宏定义，就是我们上面刚介绍的 // ... // 检查是否超过递归深度限制 if (Py_EnterRecursiveCall(\"\")) return NULL; // tstate->frame 保存当前正在执行的栈桢，所以将 f 赋值给 tstate->frame // 至于之前的 tstate->frame，则保存在 f.f_back 字段中（在创建栈桢 f 的时候就完成了） tstate->frame = f; // 如果启用追踪机制 if (tstate->use_tracing) { // tstate->c_tracefunc 对应 Python 里的 sys.settrace // 如果不为空，那么进行调用 // 该函数可以监控每行代码的执行，因此一般用于调试器 if (tstate->c_tracefunc != NULL) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } // tstate->c_profilefunc 对应 Python 里的 sys.setprofile // 如果不为空，那么进行调用，该函数主要用于性能分析 if (tstate->c_profilefunc != NULL) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } } // DTrace 是一个强大的动态追踪工具 // 这里检测是否启用了 DTrace 的函数入口探针 if (PyDTrace_FUNCTION_ENTRY_ENABLED()) // 如果启用了 DTrace，则记录函数进入的事件 dtrace_function_entry(f); // 获取栈桢内部的关键字段 co = f->f_code; names = co->co_names; consts = co->co_consts; fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; assert(PyBytes_Check(co->co_code)); assert(PyBytes_GET_SIZE(co->co_code) <= INT_MAX); assert(PyBytes_GET_SIZE(co->co_code) % sizeof(_Py_CODEUNIT) == 0); assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(co->co_code), sizeof(_Py_CODEUNIT))); // 注意这里的 first_instr，上面已经介绍了，它指向字节码指令序列的起始位置，或者说第一条指令 first_instr = (_Py_CODEUNIT *) PyBytes_AS_STRING(co->co_code); assert(f->f_lasti >= -1); // 初始状态下，next_instr 和 first_instr 相等 next_instr = first_instr; if (f->f_lasti >= 0) { assert(f->f_lasti % sizeof(_Py_CODEUNIT) == 0); next_instr += f->f_lasti / sizeof(_Py_CODEUNIT) + 1; } stack_pointer = f->f_stacktop; assert(stack_pointer != NULL); f->f_stacktop = NULL; f->f_executing = 1; // 进入主循环，在这个 for 循环里面一会儿就会看到那个巨型的 switch main_loop: // 遍历字节码指令集，处理每一条指令 for (;;) { // stack_pointer 是栈顶指针，f_valuestack 是栈底指针 // 由于 Python 的运行时栈是基于数组实现的，所以从栈底到栈顶，地址是增大的 // 因此 stack_pointer 一定大于等于 f_valuestack assert(stack_pointer >= f->f_valuestack); // STACK_LEVEL() 一定小于等于运行时栈的长度，之前说过的 assert(STACK_LEVEL() <= co->co_stacksize); // 线程状态对象里面没有异常产生 assert(!_PyErr_Occurred(tstate)); // 检测是否有待处理的中断（比如信号、GIL 释放请求等） if (_Py_atomic_load_relaxed(eval_breaker)) { opcode = _Py_OPCODE(*next_instr); /* 如果指令是以下之一，那么忽略中断，直接跳到 fast_next_opcode 标签进行处理 * SETUP_FINALLY：try / finally 语句的开始 * SETUP_WITH：with 语句的开始 * BEFORE_ASYNC_WITH：async with 语句的开始 * YIELD_FROM：yield from 表达式 */ // 这种设计主要是为了确保在某些关键操作（如资源管理、异常处理、异步操作）的开始阶段不被中断信号打断 // 从而保证这些操作的正确性和可靠性，进而保证 Python 程序的稳定性和可预测性 if (opcode == SETUP_FINALLY || opcode == SETUP_WITH || opcode == BEFORE_ASYNC_WITH || opcode == YIELD_FROM) { goto fast_next_opcode; } // 使用原子操作检查是否有待处理的信号 // 如果有待处理的信号，那么调用 handle_signals 函数处理它们 // 这个机制允许 Python 程序响应外部事件和系统信号，同时保证执行的正确性 if (_Py_atomic_load_relaxed(&ceval->signals_pending)) { if (handle_signals(runtime) != 0) { goto error; } } // 通过原子操作检查是否有待处理的调用需要执行，calls_to_do 是一个计数器，表示待处理的调用的数量 // 如果有待处理的调用，那么执行 make_pending_calls 函数 // pending calls 主要用于垃圾回收（GC）、异步 IO 回调、定时器事件等 // 这个机制是 Python 运行时系统的重要组成部分，允许虚拟机在主循环中处理各种异步任务和周期性任务 // 确保各种后台任务能够得到及时处理，并且不需要使用额外的线程和复杂的调度机制 if (_Py_atomic_load_relaxed(&ceval->pending.calls_to_do)) { if (make_pending_calls(runtime) != 0) { goto error; } } // 通过原子操作检查是否有释放 GIL 的请求，如果有，那么该线程就要释放 GIL if (_Py_atomic_load_relaxed(&ceval->gil_drop_request)) { // 将当前线程状态设置为 NULL，因为要发生切换了（关于 GIL，后续会单独介绍） if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) { Py_FatalError(\"ceval: tstate mix-up\"); } // 释放 GIL，给其它线程一个机会，不能让某一个线程一直霸占着 // 如果开启了多线程，那么当释放 GIL 的那一刻，就会被其它线程获取 drop_gil(ceval, tstate); // GIL 释放之后，还要再次获取，但 GIL 已经被其它线程拿走了 // 所以会触发操作系统内核的线程调度机制，进入阻塞状态，等待 GIL 再度回到自己手中 // 因此不难发现，如果有 n 个线程，那么其中的 n - 1 个会陷入阻塞，等待获取 GIL // 而一旦持有 GIL 的线程执行了 drop_gil 函数，将 GIL 释放了 // 那么这 n - 1 个线程当中就会有一个线程拿到 GIL 并解除阻塞，然后开始执行字节码 // 至于释放 GIL 的线程，则会尝试再次获取 GIL，但会因为获取不到而陷入阻塞（已经被其它线程拿走了） take_gil(ceval, tstate); // 检查是否需要快速退出线程（比如在解释器关闭时） exit_thread_if_finalizing(runtime, tstate); // 到这里说明 take_gil 返回了（即阻塞状态解除），也意味着拿到了 GIL，那么要恢复线程状态 if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) { Py_FatalError(\"ceval: orphan tstate\"); } } // 检测线程状态中是否存在异步的异常 if (tstate->async_exc != NULL) { PyObject *exc = tstate->async_exc; tstate->async_exc = NULL; UNSIGNAL_ASYNC_EXC(ceval); _PyErr_SetNone(tstate, exc); Py_DECREF(exc); goto error; } } // 以上是一些中断检测逻辑，如果执行顺利，那么会走到这里 fast_next_opcode: // 保存上一条已执行完毕的字节码的偏移量 f->f_lasti = INSTR_OFFSET(); // 如果启用了 DTrace 行追踪，那么记录行级别的执行信息 if (PyDTrace_LINE_ENABLED()) maybe_dtrace_line(f, &instr_lb, &instr_ub, &instr_prev); // 检查是否需要执行行级追踪，如果追踪功能可用并且设置了追踪函数，那么执行 // 这是 Python 调试和性能分析功能的核心部分，使得像 pdb 这样的调试器能够逐行执行代码 if (_Py_TracingPossible(ceval) && tstate->c_tracefunc != NULL && !tstate->tracing) { int err; // 保存当前栈指针 f->f_stacktop = stack_pointer; // 调用行追踪函数 err = maybe_call_line_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, &instr_lb, &instr_ub, &instr_prev); // 追踪函数可能改变帧的状态，需要重新加载，并更新栈指针 JUMPTO(f->f_lasti); if (f->f_stacktop != NULL) { stack_pointer = f->f_stacktop; f->f_stacktop = NULL; } if (err) goto error; } // 这个宏前面介绍了，它会获取下一条待处理的指令和指令参数 NEXTOPARG(); // 进入 dispatch_opcode 标签 dispatch_opcode: // 下面这些宏主要用于指令追踪和性能分析，简单了解一下就好\n#ifdef DYNAMIC_EXECUTION_PROFILE // 如果启用了动态执行性能分析\n#ifdef DXPAIRS // 如果启用了指令对分析 dxpairs[lastopcode][opcode]++; // 记录相邻指令对的出现次数 lastopcode = opcode; // 更新上一个指令\n#endif dxp[opcode]++; // 记录单个指令的执行次数\n#endif #ifdef LLTRACE // 如果启用了低级追踪，并且追踪开关打开，那么打印偏移量、指令、指令参数等信息 if (lltrace) { if (HAS_ARG(opcode)) { printf(\"%d: %d, %d\\n\", f->f_lasti, opcode, oparg); } else { printf(\"%d: %d\\n\", f->f_lasti, opcode); } }\n#endif // 好的，关键来了，我们终于来到了这个巨型的 switch // 一个指令对应一个 case 分支，里面包含了该指令的处理逻辑 // 因为有一百多个 case 分支，所以这个 switch 语句的代码量高达 2300 多行 // 当然啦，也仅仅只是代码量大，但逻辑很单纯，就是定义了一百多条指令的处理逻辑嘛 switch (opcode) { // NOP 指令的处理逻辑，另外还记得这个 TARGET 宏吗？如果开启了计算跳转，那么分支内部还会定义一个标签 // 此时 case TARGET(NOP) 会展开成 case NOP: TARGET_NOP: case TARGET(NOP): { FAST_DISPATCH(); } // LOAD_FAST 指令的处理逻辑 case TARGET(LOAD_FAST): { PyObject *value = GETLOCAL(oparg); if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // LOAD_CONST 指令的处理逻辑 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); PyObject *value = GETITEM(consts, oparg); Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // STORE_FAST 指令的处理逻辑 case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); PyObject *value = POP(); SETLOCAL(oparg, value); FAST_DISPATCH(); } // POP_TOP 指令的处理逻辑 case TARGET(POP_TOP): { PyObject *value = POP(); Py_DECREF(value); FAST_DISPATCH(); } // ... // ... // ... // MAKE_FUNCTION 指令的处理逻辑 case TARGET(MAKE_FUNCTION): { // ... PUSH((PyObject *)func); DISPATCH(); } // BUILD_SLICE 指令的处理逻辑 case TARGET(BUILD_SLICE): { // ... if (slice == NULL) goto error; DISPATCH(); } // FORMAT_VALUE 指令的处理逻辑 case TARGET(FORMAT_VALUE): { // ... DISPATCH(); } // EXTENDED_ARG 指令的处理逻辑 case TARGET(EXTENDED_ARG): { int oldoparg = oparg; NEXTOPARG(); oparg |= oldoparg << 8; goto dispatch_opcode; } /* 这些指令内部的具体逻辑，我们后续会聊 */ // 如果执行到这里，说明上面的 case 分支都没有匹配到，意味着出现了一个未知的指令 // 那么打印错误信息：unknown opcde，不过基本不会发生，除非你刻意构造一个不存在的指令\n#if USE_COMPUTED_GOTOS _unknown_opcode:\n#endif default: fprintf(stderr, \"XXX lineno: %d, opcode: %d\\n\", PyFrame_GetLineNumber(f), opcode); _PyErr_SetString(tstate, PyExc_SystemError, \"unknown opcode\"); goto error; } // 到这里，switch 语句块就结束了 // 这个位置永远不可能到达，因为在每条指令的处理逻辑的最后，要么调用 DISPATCH()，要么 goto error // 调用 DISPATCH() 会去执行下一条指令，goto error 会跳转到下面的 error 标签 // 当然这里的 Py_UNREACHABLE() 有没有都无所谓，但加上之后会让程序显得更加严谨 Py_UNREACHABLE(); // 如果字节码指令在执行时出错了，那么会设置异常，然后跳转到 error 标签\nerror:\n// 以下是错误处理的防御性代码，用于确保在发生错误时总是设置了适当的异常 // 记得之前介绍过异常的本质，其实就是解释器内部在执行时发现逻辑出问题了（比如索引超出范围）\n// 那么会将异常（比如 IndexError）设置在回溯栈中，并立即返回一个表示错误的哨兵值\n// 当解释器将返回值传递给 Python 时，会发现返回值为 NULL，知道出异常了\n// 于是会将回溯栈里的异常输出到 stderr 当中，就是我们在终端中看到的那一坨红色的东西，然后结束进程\n// 但如果解释器发现回溯栈里面没有异常，那么会额外设置一个 SystemError: error return without exception set\n// 意思就是：\"明明发生错误了，为什么回溯栈里面没有设置异常呢？\"，一般这个问题会在用 C 编写扩展模块的时候遇到 #ifdef NDEBUG if (!_PyErr_Occurred(tstate)) { _PyErr_SetString(tstate, PyExc_SystemError, \"error return without exception set\"); }\n#else // 当然如果没有定义 NDEBUG 宏的话，那么就会展开成一个 assert 断言 // 对于解释器本身来说，像这种 assert 断言都是成立的，否则底层源码写的就有问题 assert(_PyErr_Occurred(tstate));\n#endif // 报错时，要生成 traceback，即回溯栈，关于 traceback，等介绍异常捕获的时候再说 PyTraceBack_Here(f); // 执行追踪函数，用于调试器捕获异常、追踪异常、以及异常处理的监控和分析等 // 在使用 pdb 调试器时，这个机制允许调试器捕获和显示异常信息 if (tstate->c_tracefunc != NULL) call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); // 这里和异常捕获相关，我们后续再聊 exception_unwind: while (f->f_iblock > 0) { // ... } break; } // 到这里，外层的 for 循环就结束了，显然会有两种情况 // 要么字节码都执行完毕了，要么出异常了，但不管是哪种，都意味着要退出栈桢了 assert(retval == NULL); assert(_PyErr_Occurred(tstate)); // 到这里说明要退出栈桢了，如果运行时栈里面还有元素的话，那么要清空\nexit_returning: while (!EMPTY()) { PyObject *o = POP(); Py_XDECREF(o); } // 生成器在 yield 时的追踪处理逻辑\n// 另外像这些追踪函数可以不用太关注，都是用于调试和性能分析的\nexit_yielding: if (tstate->use_tracing) { if (tstate->c_tracefunc) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } if (tstate->c_profilefunc) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } } // 帧评估函数退出时的清理代码\nexit_eval_frame: // 如果启用了 DTrace，记录函数返回事件 if (PyDTrace_FUNCTION_RETURN_ENABLED()) dtrace_function_return(f); // 退出递归调用，与之前的 Py_EnterRecursiveCall() 相对应 Py_LeaveRecursiveCall(); // 标记帧不再处于执行状态 f->f_executing = 0; // 当调用一个函数时，会在当前帧的基础上创建新的帧，并将执行权交给新的帧 // 当函数执行完毕时，会销毁栈桢，并将执行权还给上一级栈帧（即调用者的帧），这个过程叫做栈桢回退 // 显然这里要将 f->back 赋值给 tstate->frame，即回退到上一级栈桢 tstate->frame = f->f_back; // 检查返回值的有效性，确保返回值符合 Python 的调用约定 return _Py_CheckFunctionResult(NULL, retval, \"PyEval_EvalFrameEx\"); } 以上就是帧评估函数的源码逻辑，总的来说并不难理解，其核心就是通过 for 循环遍历字节码指令集，将遍历出的指令交给内部的 switch 语句，执行对应的 case 分支。当匹配到的 case 分支执行完毕时，会有以下三种情况： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，跳转到 error 标签，然后进行异常处理（或者直接抛出异常）。 执行下一条指令，如果开启了计算跳转，那么会精确跳转到下一条指令的处理逻辑中，否则会跳转到 fast_next_opcode 标签的所在位置、或者 for 循环的所在位置。但不管如何，虚拟机接下来的动作就是获取下一条字节码指令和指令参数，完成对下一条指令的执行。 所以通过 for 循环一条一条遍历 co_code 中的字节码指令，然后交给内部的 switch 语句、执行对应的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 相信到此刻你已经彻底了解了 Python 执行引擎的整体结构。说白了虚拟机就是将自己当成一个 CPU，在栈帧中一条条的执行指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 源码解析字节码指令的执行过程","id":"262","title":"源码解析字节码指令的执行过程"},"263":{"body":"光看源码还是有点枯燥的，下面我们来写一段简单的代码，然后反编译，并通过画图来演示虚拟机是如何执行字节码的。 code = \"\"\"\\\nchinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3\n\"\"\" # 将上面的代码以模块的方式进行编译\nco = compile(code, \"my_module\", \"exec\")\n# 查看常量池\nprint(co.co_consts) # (89, 99, 91, 3, None)\n# 查看符号表\nprint(co.co_names) # ('chinese', 'math', 'english', 'avg') 在编译的时候，常量和符号（变量）都会被静态收集起来。然后我们反编译一下看看字节码，直接通过 dis.dis(co) 即可，结果如下： 1 0 LOAD_CONST 0 (89) 2 STORE_NAME 0 (chinese) 2 4 LOAD_CONST 1 (99) 6 STORE_NAME 1 (math) 3 8 LOAD_CONST 2 (91) 10 STORE_NAME 2 (english) 4 12 LOAD_NAME 0 (chinese) 14 LOAD_NAME 1 (math) 16 BINARY_ADD 18 LOAD_NAME 2 (english) 20 BINARY_ADD 22 LOAD_CONST 3 (3) 24 BINARY_TRUE_DIVIDE 26 STORE_NAME 3 (avg) 28 LOAD_CONST 4 (None) 30 RETURN_VALUE 上面每一列的含义之前说过，这里再重复一下。 第一列是源代码的行号； 第二列是指令的偏移量，或者说该指令在整个字节码指令序列中的索引。因为每条指令后面都跟着一个参数，所以偏移量是 0 2 4 6 8 ...； 第三列是字节码指令，简称指令，它们在宏定义中代表整数； 第四列是字节码指令参数，简称指令参数、或者参数，不同的指令参数的含义不同； 第五列是 dis 模块给我们额外提供的信息，一会儿说； 我们从上到下依次解释每条指令都干了什么？ 0 LOAD_CONST：表示加载一个常量（指针），并压入运行时栈。后面的指令参数 0 表示从常量池中加载索引为 0 的常量，至于 89 则表示加载的常量是 89。所以最后面的括号里面的内容实际上起到的是一个提示作用，告诉你加载的对象是什么。 2 STORE_NAME：表示将 LOAD_CONST 加载的常量用一个名字绑定起来，放在所在的名字空间中。后面的 0 (chinese) 则表示使用符号表中索引为 0 的名字（符号），且名字为 \"chinese\"。 所以像 chinese = 89 这种简单的赋值语句，会对应两条字节码指令。 然后 4 LOAD_CONST、6 STORE_NAME 和 8 LOAD_CONST、10 STORE_NAME 的作用显然和上面是一样的，都是加载一个常量，然后将某个符号和常量绑定起来，并放在名字空间中。 12 LOAD_NAME：加载一个变量，并压入运行时栈，而后面的 0 (chinese) 表示加载符号表中索引为 0 的变量的值，然后这个变量叫 chinese。14 LOAD_NAME 也是同理，将符号表中索引为 1 的变量的值压入运行时栈，并且变量叫 math。此时栈里面有两个元素，从栈底到栈顶分别是 chinese 和 math。 16 BINARY_ADD：将上面两个变量从运行时栈弹出，然后执行加法操作，并将结果压入运行时栈。 18 LOAD_NAME：将符号表中索引为 2 的变量 english 的值压入运行时栈，此时栈里面有两个元素，从栈底到栈顶分别是 chinese + math 的返回结果和 english。 20 BINARY_ADD：将运行时栈里的两个元素弹出，然后执行加法操作，并将结果压入运行时栈。此时栈里面有一个元素，就是 chinese + math + english 的返回结果。 22 LOAD_CONST：将常量 3 压入运行时栈，此时栈里面有两个元素； 24 BINARY_TRUE_DIVIDE：将运行时栈里的两个元素弹出，然后执行除法操作，并将结果压入运行时栈，此时栈里面有一个元素； 26 STORE_NAME：将元素从运行时栈里面弹出，并用符号表中索引为 3 的变量 avg 和它绑定起来，然后放在名字空间中。 28 LOAD_CONST：将常量 None 压入运行时栈，然后通过 30 RETURN_VALUE 将其从栈中弹出、并返回。 所以 Python 虚拟机就是把自己想象成一个 CPU，在栈帧中一条条执行字节码指令，当指令执行完毕或执行出错时，停止执行。 我们通过几张图展示一下上面的过程，为了阅读方便，这里将相应的源代码再贴一份。 chinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3 之前说了，模块也有自己的作用域，并且是全局作用域，所以虚拟机也会为它创建栈帧。而在代码还没有执行的时候，栈帧就已经创建好了，整个布局如下。 f_localsplus 下面的箭头方向，代表运行时栈从栈底到栈顶的方向。 这里再强调一下 f_localsplus 字段，它是一个柔性数组。虽然声明的时候写着长度为 1，但实际使用时，长度不受限制，和 Go 语言不同，C 数组的长度不属于类型的一部分。然后 f_localsplus 在逻辑上被分成了四份，分别用于局部变量、cell 变量、free 变量、运行时栈，由于当前示例中的代码是以模块的方式编译的，里面所有的变量都是全局变量，而且也不涉及闭包啥的，所以这里就把 f_localsplus 理解为运行时栈即可。 接下来就开始执行字节码了，next_instr 指向下一条待执行的字节码指令，显然初始状态下，下一条待执行的指令就是第一条指令。 于是虚拟机开始执行 0 LOAD_CONST，该指令表示将常量加载进运行时栈，而要加载的常量在常量池中的索引，由指令参数表示。 在源码中，指令对应的变量是 opcode，指令参数对应的变量是 oparg。 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); // 调用元组的 GETITEM 方法，从常量池中加载索引为 oparg 的对象 // 当然啦，为了描述方便我们称之为对象，但其实是指向对象的指针 PyObject *value = GETITEM(consts, oparg); // 增加引用计数 Py_INCREF(value); // 压入运行时栈 PUSH(value); FAST_DISPATCH();\n} 该指令的参数为 0，所以会将常量池中索引为 0 的元素 89 压入运行时栈，执行完之后，栈帧的布局就变成了下面这样： 接着虚拟机执行 2 STORE_NAME 指令，从符号表中获取索引为 0 的符号、即 chinese。然后将栈顶元素 89 弹出，再将符号 chinese 和整数对象 89 绑定起来保存到 local 名字空间中。 case TARGET(STORE_NAME): { // 从符号表中加载索引为 oparg 的符号 // 符号本质上就是一个 PyUnicodeObject 对象 // 这里就是字符串 \"chinese\" PyObject *name = GETITEM(names, oparg); // 从运行时栈的栈顶弹出元素 // 显然是上一步压入的 89 PyObject *v = POP(); // 获取名字空间 namespace PyObject *ns = f->f_locals; int err; // 如果没有名字空间则报错，设置异常 if (ns == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals found when storing %R\", name); Py_DECREF(v); goto error; } // 将符号和对象绑定起来放在 ns 中 // 名字空间是一个字典，PyDict_CheckExact 负责检测 ns 是否为字典，等价于 type(ns) is dict // 除此之外，还有 PyDict_Check(ns)，它等价于 isinstance(ns, dict) if (PyDict_CheckExact(ns)) // 通过字典的特定类型 API 将键值对 \"chinese\": 89 设置到字典中 err = PyDict_SetItem(ns, name, v); else // 走到这里说明 type(ns) 不是 dict，那么它应该继承 dict // 通过泛型 API 设置元素 err = PyObject_SetItem(ns, name, v); // 对象的引用计数减 1，因为从运行时栈中弹出了 Py_DECREF(v); // 如果 err != 0，证明设置元素出错了，跳转至 error 标签 if (err != 0) goto error; // 调用 DISPATCH() 执行下一条指令，如果没有开启计算跳转，那么它就相当于一个 continue DISPATCH();\n} 执行完之后，栈帧的布局就变成了下面这样： 此时运行时栈为空，local 名字空间多了个键值对。 同理剩余的两个赋值语句也是类似的，只不过指令参数不同，比如 6 STORE_NAME 加载的是符号表中索引为 1 的符号，10 STORE_NAME 加载的是符号表中索引为 2 的符号，分别是 math 和 english。它们执行完之后，栈桢布局如下： 然后 12 LOAD_NAME 和 14 LOAD_NAME 负责将符号表中索引为 0 和 1 的变量的值压入运行时栈： case TARGET(LOAD_NAME): { // 从符号表 co_names 中加载索引为 oparg 的变量（符号） // 但是注意：全局变量是通过字典存储的 // 所以这里的 name 只是一个字符串罢了，比如 \"chinese\" // 然后还要再根据这个字符串从字典里面查找对应的 value PyObject *name = GETITEM(names, oparg); // 对于模块来说，f->f_locals 和 f->f_globals 指向同一个字典 PyObject *locals = f->f_locals; PyObject *v; // local 名字空间一定不为 NULL if (locals == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals when loading %R\", name); goto error; } // 如果 type(locals) is dict 为真 if (PyDict_CheckExact(locals)) { // 根据 name 获取 value，所以 print(chinese) 本质上就是下面这样 // print(locals[\"chinese\"]) v = PyDict_GetItemWithError(locals, name); if (v != NULL) { Py_INCREF(v); } else if (_PyErr_Occurred(tstate)) { goto error; } } // 否则说明 type(locals) is dict 为假，但 isinstance(locals, dict) 为真 else { // 通过泛型 API 获取元素 v = PyObject_GetItem(locals, name); if (v == NULL) { if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) goto error; _PyErr_Clear(tstate); } } // 如果 v 等于 NULL，说明 local 空间不存在 if (v == NULL) { // 那么从全局名字空间（global 名字空间）获取 v = PyDict_GetItemWithError(f->f_globals, name); // 如果 v 不等于 NULL，说明获取到了 if (v != NULL) { Py_INCREF(v); } // 否则说明 global 空间也不存在指定的 key // 这里检测一下是否有异常产生，有的话跳转到 error 标签 else if (_PyErr_Occurred(tstate)) { goto error; } // local 空间和 global 空间都没有，那么该去 builtin 空间查找了 else { // 逻辑和上面是类似的，如果查找不到，跳转到 error 标签，否则增加引用计数 if (PyDict_CheckExact(f->f_builtins)) { v = PyDict_GetItemWithError(f->f_builtins, name); if (v == NULL) { if (!_PyErr_Occurred(tstate)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } Py_INCREF(v); } else { v = PyObject_GetItem(f->f_builtins, name); if (v == NULL) { if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } } } } // 压入运行时栈 PUSH(v); DISPATCH();\n} 上面两条指令执行完之后，栈帧的布局就变成了下面这样： 接下来执行 16 BINARY_ADD，它会将栈里的两个元素弹出，然后执行加法操作，最后再将结果入栈。 当然上面这种说法是为了方便理解，其实虚拟机真正执行的时候，只会弹出一个元素，而另一个元素只是使用 TOP() 进行查看，但不弹出。等结果计算完毕之后，再将栈顶元素替换掉。 所以本质上，和弹出两个元素、再将计算结果入栈是一样的。 case TARGET(BINARY_ADD): { // 从栈顶弹出元素，这里是 99（变量 math） PyObject *right = POP(); // math 弹出之后，chinese 就成为了新的栈顶元素 // 这里的 TOP() 则是获取栈顶元素 89（变量 chinese） PyObject *left = TOP(); // 用于保存两者的和 PyObject *sum; // 如果是字符串，执行专门的函数 if (PyUnicode_CheckExact(left) && PyUnicode_CheckExact(right)) { sum = unicode_concatenate(tstate, left, right, f, next_instr); } // 否则通过泛型 API 进行计算 else { sum = PyNumber_Add(left, right); Py_DECREF(left); } // 减少元素的引用计数 Py_DECREF(right); // 将栈顶元素替换成 sum SET_TOP(sum); if (sum == NULL) goto error; DISPATCH();\n} BINARY_ADD 指令执行完之后，栈帧的布局就变成了下面这样： 然后 18 LOAD_NAME 负责将符号表中索引为 2 的变量 english 的值压入运行时栈，而指令 20 BINARY_ADD 则是继续执行加法操作，并将结果设置在栈顶，然后 22 LOAD_CONST 将常量 3 再压入运行时栈。 这三条指令执行之后，运行时栈的变化如下： 接着是 24 BINARY_TRUE_DIVIDE，它的逻辑和 BINARY_ADD 类似，只不过一个执行除法，一个执行加法。 case TARGET(BINARY_TRUE_DIVIDE): { // 从栈顶弹出元素，显然是 3 PyObject *divisor = POP(); // 查看栈顶元素，此时栈顶元素变成了 279 PyObject *dividend = TOP(); // 调用 PyNumber_TrueDivide，执行 279 / 3 PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); // 减少引用计数 Py_DECREF(dividend); Py_DECREF(divisor); // 将栈顶元素替换成 279 / 3 的计算结果 SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} 当 24 BINARY_TRUE_DIVIDE 执行完之后，运行时栈如下： 然后 26 STORE_NAME 将栈顶元素 93.0 弹出，并将符号表中索引为 3 的变量 avg 和它绑定起来，放到名字空间中。因此最终栈帧关系图如下： 以上就是虚拟机对这几行代码的执行流程，整个过程就像 CPU 执行指令一样。 我们再用 Python 代码描述一遍上面的逻辑： # LOAD_CONST 将 89 压入栈中，STORE_NAME 将 89 从栈中弹出\n# 并将符号 \"chinese\" 和 89 绑定起来，放在名字空间中\nchinese = 89\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89} math = 99\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99} english = 91\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91} avg = (chinese + math + english) / 3\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91, 'avg': 93.0} 现在你是不是对虚拟机执行字节码有更深的了解了呢？当然字节码指令非常多，不止我们上面看到的那几个。你可以随便写一些代码，然后分析一下它的字节码指令是什么。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 通过反编译查看字节码","id":"263","title":"通过反编译查看字节码"},"264":{"body":"到此，我们就深入源码，考察了虚拟机执行字节码的流程，帧评估函数虽然很长，也有那么一些复杂，但是核心逻辑不难理解。就是把自己当成一个 CPU，在栈帧中执行字节码指令。 下一篇文章我们来介绍一下常见的几个指令，并探讨不同的变量赋值语句的背后原理。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 小结","id":"264","title":"小结"},"265":{"body":"前面我们剖析了字节码的执行流程，本来应该接着介绍一些常见指令的，但因为有几个指令涉及到了局部变量，所以我们单独拿出来说。与此同时，我们还要再度考察一下 local 名字空间，它的背后还隐藏了很多内容。 我们知道函数的参数和函数内部定义的变量都属于局部变量，均是通过静态方式访问的。 x = 123 def foo1(): global x a = 1 b = 2 # co_nlocals 会返回局部变量的个数\n# a 和 b 是局部变量，x 是全局变量，因此是 2\nprint(foo1.__code__.co_nlocals) # 2 def foo2(a, b): pass print(foo2.__code__.co_nlocals) # 2 def foo3(a, b): a = 1 b = 2 c = 3 print(foo3.__code__.co_nlocals) # 3 无论是参数还是内部新创建的变量，本质上都是局部变量。 按照之前的理解，当访问一个全局变量时，会去访问 global 名字空间（也叫全局名字空间）。 那么问题来了，当操作函数的局部变量时，是不是也等价于操作其内部的 local 名字空间（局部名字空间）呢？我们往下看。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 楔子","id":"265","title":"楔子"},"266":{"body":"之前我们说过 Python 变量的访问是有规则的，会按照本地、闭包、全局、内置的顺序去查找，也就是 LEGB 规则，所以在查找变量时，local 名字空间应该是第一选择。 但不幸的是，虚拟机在为调用的函数创建栈帧对象时，这个至关重要的 local 名字空间并没有被创建。因为栈帧的 f_locals 字段和 f_globals 字段分别指向了局部名字空间和全局名字空间，而创建栈帧时 f_locals 被初始化成了 NULL，所以并没有创建局部名字空间。这里可能有人会有疑问，因为印象之中函数是有 local 空间的吧。 import inspect # 模块的栈帧\nframe = inspect.currentframe()\n# 对于模块而言，局部名字空间和全局名字空间是同一个字典\nprint(frame.f_locals is frame.f_globals) # True\n# 当然啦，局部名字空间和全局名字空间也可以通过内置函数获取\nprint( frame.f_locals is locals() is frame.f_globals is globals()\n) # True # 但对于函数而言就不一样了\ndef foo(): name = \"古明地觉\" return inspect.currentframe() frame = foo()\n# global 名字空间全局唯一\n# 无论是获取栈帧的 f_globals，还是调用 globals()，得到的都是同一份字典\nprint(frame.f_globals is globals()) # True\n# 但每个函数都有自己独立的局部名字空间\nprint(frame.f_locals) # {'name': '古明地觉'} # 咦，不是说局部名字空间被初始化为 NULL 吗？\n# 那么在 Python 里面获取的话，结果应该是个 None 才对啊\n# 关于这一点，我们稍后会解释 总之对于函数而言，在创建栈帧时，它的 f_locals 被初始化为 NULL。那么问题来了，局部变量到底存储在什么地方呢？当然，由于变量只是一个名字（符号），而局部变量的名字都存储在符号表中，所以更严谨的说法是，局部变量的值存储在什么地方？ 在介绍虚拟机执行字节码的时候我们说过，当函数被调用时，虚拟机会为其创建一个栈帧。栈帧是虚拟机的执行环境，包含了执行时所依赖的上下文，而栈帧内部有一个字段叫 f_localsplus，它是一个数组。 这个数组虽然是一段连续内存，但在逻辑上被分成了 4 份，其中局部变量便存储在 f_localsplus 的第一份空间中。现在我们明白了，局部变量是静态存储在数组中的。 我们举个例子。 def foo(a, b): c = a + b print(c) 它的字节码如下： // 加载局部变量 a，压入运行时栈\n2 0 LOAD_FAST 0 (a) // 加载局部变量 b，压入运行时栈 2 LOAD_FAST 1 (b) // 将 a 和 b 从栈中弹出，然后做加法运算，再将结果压入栈中 4 BINARY_ADD // 加载符号 c，弹出栈顶元素（a + b 的运算结果） // 然后将两者绑定起来，完成赋值语句 c = a + b 6 STORE_FAST 2 (c) // 加载变量 print，优先从 global 空间中加载 // 如果 global 空间里面没有，那么再从 builtin 空间中加载\n3 8 LOAD_GLOBAL 0 (print) // 加载局部变量 c 10 LOAD_FAST 2 (c) // 执行 print(c)，并将返回值压入栈中，print 的返回值是 None 12 CALL_FUNCTION 1 // 弹出栈顶的返回值，因为没有用变量保存，所以会直接丢弃 14 POP_TOP // 隐式的 return None 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 注意里面的 LOAD_FAST 和 STORE_FAST，这两个指令对应的逻辑如下。 case TARGET(LOAD_FAST): { // 通过宏 GETLOCAL 获取局部变量的值 PyObject *value = GETLOCAL(oparg); // 如果值为 NULL，抛出 UnboundLocalError if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } // 增加引用计数并压入运行时栈 Py_INCREF(value); PUSH(value); FAST_DISPATCH();\n} case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); // 获取栈顶元素 PyObject *value = POP(); // 通过宏 SETLOCAL 创建局部变量 SETLOCAL(oparg, value); FAST_DISPATCH();\n} 所以 LOAD_FAST 和 STORE_FAST 分别负责加载和创建局部变量，而核心就是里面的两个宏：GETLOCAL、SETLOCAL，这两个宏也是定义在帧评估函数里面的。 // Python/ceval.c // 在帧评估函数中，fastlocals 会被赋值为 f->f_localsplus\n#define GETLOCAL(i) (fastlocals[i]) #define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \\ GETLOCAL(i) = value; \\ Py_XDECREF(tmp); } while (0)\n/* 这里额外再补充一个关于 C 语言的知识点 * 我们看到宏 SETLOCAL 展开之后的结果是 do {...} while (0) * do while 循环会先执行 do 里面的循环体，然后再判断条件是否满足 * 因此从效果上来说，执行 do {...} while (0) 和直接执行 ... 是等价的 * 那么问题来了，既然效果等价，为啥还要再套一层 do while 呢 * 其实原因很简单，如果宏在展开之后会生成多条语句，那么这些语句要成为一个整体 * 另外由于 C 程序的语句要以分号结尾，所以在调用宏时，我们也会习惯性地在结尾加上分号 * 因此我们希望有这样一种结构，能同时满足以下要求： * 1）可以将多条语句包裹起来，作为一个整体； * 2）程序的语义不能发生改变； * 3）在语法上，要以分号结尾； * 显然 do while 完美满足以上三个要求，只需将 while 里的条件设置为 0 即可 * 并且当编译器看到 while (0) 时，也会进行优化，去掉不必要的循环控制结构 * 因此以后看到 do {...} while (0) 时，不要觉得奇怪，这是宏的一个常用技巧 */ 我们看到操作局部变量，就是在基于索引操作数组 f_localsplus，显然这个过程比操作字典要快。尽管字典是经过高度优化的，但显然再怎么优化，也不可能快过数组的静态操作。 所以此时我们对局部变量的藏身之处已经了然于心，它们就存放在栈帧的 f_localsplus 字段中，而之所以没有使用 local 名字空间的原因也很简单。因为函数内部的局部变量在编译时就已经确定了，个数是不会变的，因此编译时也能确定局部变量占用的内存大小，以及访问局部变量的字节码指令应该如何访问内存。 def foo(a, b): c = a + b print(c) print( foo.__code__.co_varnames\n) # ('a', 'b', 'c') 比如变量 c 位于符号表中索引为 2 的位置，这在编译时就已确定。 当创建变量 c 时，只需修改数组 f_localsplus 中索引为 2 的元素即可。 当访问变量 c 时，只需获取数组 f_localsplus 中索引为 2 的元素即可。 这个过程是基于数组索引实现的静态查找，所以操作局部变量和操作全局变量有着异曲同工之妙。操作全局变量本质上是基于 key 操作字典的 value，其中 key 是变量的名称，value 是变量的值；而操作局部变量本质上是基于索引操作数组 f_localsplus 的元素，这个索引就是变量名在符号表中的索引，对应的数组元素就是变量的值。 所以我们说 Python 的变量其实就是个名字，或者说符号，到这里是不是更加深刻地感受到了呢？ 但对于局部变量来说，如果想实现静态查找，显然要满足一个前提：变量名在符号表中的索引和与之绑定的值在 f_localsplus 中的索引必须是一致的。毫无疑问，两者肯定是一致的，并且索引是多少在编译阶段便已经确定，会作为指令参数保存在字节码指令序列中。 好，到此可以得出结论，虽然虚拟机为函数实现了 local 名字空间（初始为 NULL），但在操作局部变量时却没有使用它，原因就是为了更高的效率。当然还有所谓的 LEGB，都说变量查找会遵循这个规则，但我们心里清楚，局部变量其实是静态访问的，不过完全可以按照 LEGB 的方式来理解。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 如何访问（创建）一个局部变量","id":"266","title":"如何访问（创建）一个局部变量"},"267":{"body":"先来看一下全局名字空间： x = 1 def foo(): globals()[\"x\"] = 2 foo()\nprint(x) # 2 global 空间全局唯一，在 Python 层面上就是一个字典，在任何地方操作该字典，都相当于操作全局变量，即使是在函数内部。因此在执行完 foo() 之后，全局变量 x 就被修改了。但 local 名字空间也是如此吗？我们尝试一下。 def foo(): x = 1 locals()[\"x\"] = 2 print(x) foo() # 1 我们按照相同的套路，却并没有成功，这是为什么？原因就是上面解释的那样，函数内部有哪些局部变量在编译时就已经确定了，查询的时候是从数组 f_localsplus 中静态查找的，而不是从 local 名字空间中查找。 然后我们打印一下 local 名字空间，看看里面都有哪些内容。 def foo(): name = \"satori\" print(locals()) age = 17 print(locals()) gender = \"female\" print(locals()) foo()\n\"\"\"\n{'name': 'satori'}\n{'name': 'satori', 'age': 17}\n{'name': 'satori', 'age': 17, 'gender': 'female'}\n\"\"\" 我们看到打印 locals() 居然也会显示内部的局部变量，相信聪明如你已经猜到 locals() 是怎么回事了。符号表里面存储了局部变量的符号（或者说名字），f_localsplus 里面存储了局部变量的值，当执行 locals() 的时候，会基于符号表和 f_localsplus 创建一个字典出来。 def foo(): name = \"satori\" age = 17 gender = \"female\" print(locals()) # 符号表：保存了函数中创建的局部变量的名字\nprint(foo.__code__.co_varnames)\n\"\"\"\n('name', 'age', 'gender')\n\"\"\"\n# 调用函数时会创建栈帧，局部变量的值都保存在 f_localsplus 里面\n# 并且符号表中变量名的顺序和 f_localsplus 中变量值的顺序是一致的\nf_localsplus = [\"satori\", 17, \"female\"]\n# 这里就用一个列表来模拟了 我们来看一下变量的创建。 由于符号 name 位于符号表中索引为 0 的位置，那么执行 name = \"satori\" 时，就会将 \"satori\" 放在 f_localsplus 中索引为 0 的位置。 由于符号 age 位于符号表中索引为 1 的位置，那么执行 age = 17 时，就会将 17 放在 f_localsplus 中索引为 1 的位置。 由于符号 gender 位于符号表中索引为 2 的位置，那么执行 gender = \"female\" 时，就会将 \"female\" 放在 f_localsplus 中索引为 2 的位置。 后续在访问变量的时候，比如访问变量 age，由于它位于符号表中索引为 1 的位置，那么就会通过 f_localsplus[1] 获取它的值，这些符号对应的索引都是在编译阶段确定的。所以在运行时才能实现静态查找，指令 LOAD_FAST 和 STORE_FAST 都是基于索引来静态操作底层数组。 我们用一张图来描述这个过程： 符号表负责存储局部变量的名字，f_localsplus 负责存储局部变量的值（里面的元素初始为 NULL），而在给局部变量赋值的时候，本质上就是将值写在了 f_localsplus 中。并且变量名在符号表中的索引，和变量值在 f_localsplus 中的索引是一致的，因此操作局部变量本质上就是在操作 f_localsplus 数组。至于 locals() 或者说局部名字空间，它是基于符号表和 f_localsplus 动态创建的，为了方便我们获取已存在的局部变量，执行 locals() 会临时创建一个字典（只会创建一次）。 所以我们通过 locals() 获取局部名字空间之后，访问里面的局部变量是可以的，只不过此时将静态访问变成了动态访问。 def foo(): name = \"satori\" # 会从 f_localsplus 中静态查找 print(name) # 先基于已有的变量和值创建一个字典 # 然后通过字典实现变量的动态查找 print(locals()[\"name\"]) foo()\n\"\"\"\nsatori\nsatori\n\"\"\" 两种方式都是可以的，但基于 locals() 来访问，在效率上明显会低一些。 另外基于 locals() 访问一个变量是可以的，但无法创建一个变量。 def foo(): name = \"satori\" locals()[\"age\"] = 17 try: print(age) except NameError as e: print(e) foo()\n\"\"\"\nname 'age' is not defined\n\"\"\" 局部变量是静态存储在数组里的，locals() 只是做了一个拷贝而已。往局部名字空间里面添加一个键值对，不等于创建一个局部变量，因为局部变量不是从它这里查找的，因此代码中打印 age 报错了。但如果外部还有一个全局变量 age 的话，那么会打印全局变量 age。 然后再补充一点，我们说全局名字空间在任何地方都是唯一的，而对于函数而言，它的局部名字空间在整个函数内部也是唯一的。不管调用 locals 多少次，拿到的都是同一个字典。 def foo(): name = \"satori\" # 执行 locals() 的时候，内部只有一个键值对 d = locals() print(d) # {'name': 'satori'} # 再次获取，此时有两个键值对 print(locals()) # {'name': 'satori', 'd': {...}} # 但两者的 id 相同，因为一个函数只有一个局部名字空间 # 不管调用多少次 locals()，拿到的都是同一个字典 print(id(d) == id(locals())) # True foo() 所以 locals() 和 globals() 指向的名字空间都是唯一的，只不过 locals() 是在某个函数内部唯一，而 globals() 在所有地方都唯一。 因此局部名字空间初始为 NULL，但在第一次执行 locals() 时，会以符号表中的符号作为 key，f_localsplus 中的值作为 value，创建一个字典作为函数的局部名字空间。而后续再执行 locals() 的时候，由于名字空间已存在，就不会再次创建了，直接基于当前的局部变量对字典进行更新即可。 def foo(): # 创建一个字典，由于当前还没有定义局部变量，因此是空字典 print(locals()) # {} # 往局部名字空间添加一个键值对 locals()[\"a\"] = \"b\" print(locals()) # {'a': 'b'} # 定义一个局部变量 name = \"satori\" # 由于局部名字空间已存在，因此不会再次创建 # 直接将局部变量的名字作为 key、值作为 value，拷贝到字典中 print(locals()) # {'a': 'b', 'name': 'satori'} foo() 注意：虽然局部名字空间里面存在 \"a\" 这个 key，但 a 这个局部变量是不存在的。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 解密 local 名字空间","id":"267","title":"解密 local 名字空间"},"268":{"body":"目前我们已经知道 local 名字空间是怎么创建的了，也熟悉了它的特性，下面通过源码来看一下它的构建过程。 // Python/bltinmodule.c static PyObject *\nbuiltin_locals_impl(PyObject *module)\n{ PyObject *d; // Python 内置函数的源码实现位于 bltinmodule.c 中 // 这里又调用了 PyEval_GetLocals d = PyEval_GetLocals(); Py_XINCREF(d); return d;\n} // Python/ceval.c\nPyObject *\nPyEval_GetLocals(void)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); // 拿到当前栈桢 PyFrameObject *current_frame = _PyEval_GetFrame(tstate); if (current_frame == NULL) { _PyErr_SetString(tstate, PyExc_SystemError, \"frame does not exist\"); return NULL; } // 调用 PyFrame_FastToLocalsWithError 创建 local 名字空间 // 并赋值给 current_frame->f_locals if (PyFrame_FastToLocalsWithError(current_frame) < 0) { return NULL; } assert(current_frame->f_locals != NULL); // 返回 current_frame->f_locals return current_frame->f_locals;\n} // Objects/frameobject.c\nint\nPyFrame_FastToLocalsWithError(PyFrameObject *f)\n{ PyObject *locals, *map; PyObject **fast; PyCodeObject *co; Py_ssize_t j; Py_ssize_t ncells, nfreevars; // 栈桢不能为空 if (f == NULL) { PyErr_BadInternalCall(); return -1; } // 获取局部名字空间 locals = f->f_locals; // 如果为 NULL，那么创建一个新字典，作为名字空间 // 所以局部名字空间只会创建一次，后续不会再创建 if (locals == NULL) { locals = f->f_locals = PyDict_New(); if (locals == NULL) return -1; } // 获取 PyCodeObject 对象 co = f->f_code; // 拿到内部的符号表（一个元组），里面保存了函数局部变量的名字 map = co->co_varnames; if (!PyTuple_Check(map)) { PyErr_Format(PyExc_SystemError, \"co_varnames must be a tuple, not %s\", Py_TYPE(map)->tp_name); return -1; } // 获取 f_localsplus，它里面保存了局部变量的值 // 只不过除了局部变量的值之外，还保存了其它的 fast = f->f_localsplus; // 那么 f_localsplus 里面到底有多少个局部变量的值呢？显然这要基于符号表来判断 // co_varnames 里面保存了多少个符号，f_localsplus 里面就保存了多少个局部变量的值 j = PyTuple_GET_SIZE(map); if (j > co->co_nlocals) // 理论上符号表的长度和局部变量的个数（co_nlocals）是相等的 // 但如果超过了 co_nlocals，那么让它等于 co_nlocals j = co->co_nlocals; // 如果 co_nlocals 大于 0，证明存在局部变量，那么调用 map_to_dict // 将 co_varnames 和 f_localsplus 里的元素组成键值对，添加到局部名字空间中 if (co->co_nlocals) { // 相当于 locals.update(zip(co_varnames, f_localsplus)) if (map_to_dict(map, j, locals, fast, 0) < 0) return -1; } // 如果里面有 cell 变量和 free 变量的话，也会添加到局部名字空间中 // 关于 cell 变量和 free 变量，由于它们和闭包相关，所以等介绍闭包的时候再说 ncells = PyTuple_GET_SIZE(co->co_cellvars); nfreevars = PyTuple_GET_SIZE(co->co_freevars); if (ncells || nfreevars) { if (map_to_dict(co->co_cellvars, ncells, locals, fast + co->co_nlocals, 1)) return -1; if (co->co_flags & CO_OPTIMIZED) { if (map_to_dict(co->co_freevars, nfreevars, locals, fast + co->co_nlocals + ncells, 1) < 0) return -1; } } return 0;\n} 可以看到，源码的实现逻辑和我们之前分析的是一样的。 变量 map 是符号表 co_varnames，保存了局部变量的名字； 变量 fast 是 f_localsplus，保存了局部变量的值； 变量 j 是局部变量的个数； 变量 locals 是局部名字空间； 然后将它们作为参数，传递给 map_to_dict 函数，该函数内部会进行遍历，按照顺序将变量名和变量值依次添加到局部名字空间中。然后我们再来看一下 map_to_dict 函数，它内部有一处细节非常之关键。 // Objects/frameobject.c static int\nmap_to_dict(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values, int deref)\n{ Py_ssize_t j; assert(PyTuple_Check(map)); assert(PyDict_Check(dict)); assert(PyTuple_Size(map) >= nmap); // nmap 表示局部变量的个数 for (j=0; j < nmap; j++) { // 从符号表中获取符号（变量名） PyObject *key = PyTuple_GET_ITEM(map, j); // values 就是 f_localsplus，然后获取变量的值 PyObject *value = values[j]; assert(PyUnicode_Check(key)); // 闭包变量相关，等介绍闭包的时候再说，由于当前不存在闭包，所以先忽略掉 if (deref && value != NULL) { assert(PyCell_Check(value)); value = PyCell_GET(value); } // 注意这一步：检测 value 是否等于 NULL，那么问题来了，什么时候 value 会等于 NULL 呢？ // 之前说了，局部变量有哪些在编译的时候就确定了，保存在符号表中，局部变量的值保存在 f_localsplus 中 // 在局部变量还没有赋值的时候，它在 f_localsplus 中对应的值就是 NULL // 而给一个局部变量赋值，本质上就是在修改 f_localsplus // 假设一个函数的符号表为 (\"a\", \"b\", \"c\")，在给变量 c 赋值之前调用了 locals() // 那么在获取变量 c 对应的值时，拿到的就是一个 NULL if (value == NULL) { // 如果某个符号对应的值为 NULL，则说明在获取名字空间时，该变量还没有被赋值 // 那么当该符号在 local 空间中已存在时，还要将它删掉。这一步非常关键，它的作用我们稍后会说 if (PyObject_DelItem(dict, key) != 0) { if (PyErr_ExceptionMatches(PyExc_KeyError)) PyErr_Clear(); else return -1; } } // 如果 value 不等于 NULL，说明变量已经完成了和某个值的绑定，于是将它们组成键值对拷贝到 local 空间中 else { if (PyObject_SetItem(dict, key, value) != 0) return -1; } } return 0;\n} 以上就是 local 名字空间的获取过程在源码层面的体现。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间的创建过程","id":"268","title":"local 名字空间的创建过程"},"269":{"body":"我们再来搭配 exec 关键字，结果会更加明显。首先 exec 函数可以将一段字符串当成代码来执行，并将执行结果体现在当前的名字空间中。 def foo(): print(locals()) # {} exec(\"x = 1\") print(locals()) # {'x': 1} try: print(x) except NameError as e: print(e) # name 'x' is not defined foo() 尽管 locals() 变了，但是依旧访问不到 x，因为虚拟机并不知道 exec(\"x = 1\") 是创建一个局部变量，它只知道这是一个函数调用。 事实上 exec 会作为一个独立的编译单元来执行，并且有自己的作用域。 所以 exec(\"x = 1\") 执行完之后，效果就是改变了局部名字空间，里面多了一个 \"x\": 1 键值对。但关键的是，局部变量 x 不是从局部名字空间中查找的，exec 终究还是错付了人。而由于函数 foo 对应的 PyCodeObject 对象的符号表中并没有 x 这个符号，所以报错了。 补充：exec 默认影响的是 local 名字空间，如果在执行时发现 local 名字空间为 NULL，那么会自动创建一个。所以调用 exec 也可以创建名字空间（当它为 NULL 时）。 exec(\"x = 1\")\nprint(x) # 1 如果放在模块里面是可以的，因为模块的 local 名字空间和 global 名字空间指向同一个字典，所以 global 名字空间会多一个 key 为 \"x\" 的键值对。而全局变量是从 global 名字空间中查找的，所以这里没有问题。 def foo(): # 此时 exec 影响的是 global 名字空间 exec(\"x = 123\", globals()) # 所以这里不会报错, 但此时的 x 不是局部变量, 而是全局变量 print(x) foo()\nprint(x)\n\"\"\"\n123\n123\n\"\"\" 可以给 exec 指定要影响的名字空间，代码中 exec 影响的是全局名字空间，打印的 x 也是全局变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间与 exec 函数","id":"269","title":"local 名字空间与 exec 函数"},"27":{"body":"前面我们介绍了 Python 对象在底层的数据结构，知道了 Python 底层是通过 PyObject 实现了对象的多态。所以我们先来分析一下 Python 为什么慢？ 在 Python 中创建一个对象，会分配内存并进行初始化，然后用一个 PyObject * 指针来维护这个对象，当然所有对象都是如此。因为指针是可以相互转化的，所以变量在保存一个对象的指针时，会将指针转成 PyObject * 之后再交给变量保存。 因此在 Python 中，变量的传递（包括函数的参数传递）实际上传递的都是泛型指针 PyObject *。这个指针具体指向什么类型的对象我们并不知道，只能通过其内部的 ob_type 字段进行动态判断，而正是因为这个 ob_type，Python 实现了多态机制。 比如 a.pop()，我们不知道 a 指向的对象是什么类型，它可能是列表、也可能是字典，或者是我们实现了 pop 方法的自定义类的实例对象。至于它到底是什么类型，只能通过 ob_type 动态判断。 如果 a 的 ob_type 为 &PyList_Type，那么 a 指向的对象就是列表，于是会调用 list 类型中定义的 pop 操作。如果 a 的 ob_type 为 &PyDict_Type，那么 a 指向的对象就是字典，于是会调用 dict 类型中定义的 pop 操作。所以变量 a 在不同的情况下，会表现出不同的行为，这正是 Python 多态的核心所在。 再比如列表，它内部的元素也都是 PyObject *，因为类型要保持一致，所以对象的指针不能直接存（因为类型不同），而是需要统一转成泛型指针 PyObject * 之后才可以存储。当我们通过索引获取到该指针进行操作的时候，也会先通过 ob_type 判断它的类型，看它是否支持指定的操作。所以操作容器内的某个元素，和操作一个变量并无本质上的区别，它们都是 PyObject *。 从这里我们也能看出 Python 为什么慢了，因为有一部分时间浪费在类型和属性的查找上面。 以变量 a + b 为例，这个 a 和 b 指向的对象可以是整数、浮点数、字符串、列表、元组、以及实现了 __add__ 方法的类的实例对象。因为 Python 的变量都是 PyObject *，所以它可以指向任意的对象，这就意味着 Python 无法做基于类型的优化。 底层在执行 a + b 时，首先要通过 ob_type 判断变量指向的对象是什么类型，这在 C 的层面需要一次属性查找。然后 Python 将每一个算术操作都抽象成了一个魔法方法，所以实例相加时要在类型对象中找到该方法对应的函数指针，这又是一次属性查找。找到了之后将 a、b 作为参数传递进去，这会产生一次函数调用，将对象维护的值拿出来进行运算，然后根据相加的结果创建一个新的对象，再将新的对象的指针转成 PyObject * 之后返回。 所以一个简单的加法运算，Python 内部居然做了这么多的工作，要是再放到循环里面，那么上面的步骤要重复 N 次。而对于 C 来讲，由于已经规定好了类型，所以 a + b 在编译之后就是一条简单的机器指令，因此两者在效率上差别很大。 当然我们不是来吐槽 Python 效率的问题，因为任何语言都有擅长的一面和不擅长的一面，这里只是通过回顾前面的知识来解释为什么 Python 效率低。因此当别人问你 Python 为什么效率低的时候，希望你能从这个角度来回答它，主要就两点： Python 无法基于类型做优化； Python 对象基本都存储在堆上； 建议不要一上来就谈 GIL，那是在多线程情况下才需要考虑的问题。而且我相信大部分觉得 Python 慢的人，都不是因为 Python 无法利用多核才觉得慢的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 为什么这么慢","id":"27","title":"Python 为什么这么慢"},"270":{"body":"我们说 exec 的执行效果会体现在 local 名字空间中，但是需要考虑变量名冲突的问题。举个例子： def foo(): exec(\"x = 1\") print(locals()[\"x\"]) foo()\n\"\"\"\n1\n\"\"\" def bar(): exec(\"x = 1\") print(locals()[\"x\"]) x = 123 bar()\n\"\"\"\nTraceback (most recent call last): File ..... bar() File ..... print(locals()[\"x\"])\nKeyError: 'x'\n\"\"\" 这是什么情况？函数 bar 只是多了一行赋值语句，为啥就报错了呢？要想搞懂这个问题，首先要明确两点： 1）函数的局部变量在编译的时候就已经确定，并存储在对应的 PyCodeObject 对象的符号表 (co_varnames) 中，这是由语法规则所决定的； 2）函数内的局部变量在其整个作用域范围内都是可见的； 对于 foo 函数来说，exec 执行完之后相当于往 local 名字空间中添加一个键值对，这没有问题。对于 bar 函数而言也是如此，在执行完 exec(\"x = 1\") 之后，local 名字空间中也会存在 \"x\": 1 这个键值对，但下面执行 locals() 的时候又把字典更新了。因为局部变量可以在函数的任意位置创建，或者修改，所以每一次执行 locals() 的时候，都会遍历符号表和 f_localsplus，组成键值对将原来的字典更新一遍。 在 bar 函数里面有一行 x = 123，所以知道函数里面存在局部变量 x，符号表里面也会有 \"x\" 这个符号，这是在编译时就确定的。但我们是在 x = 123 之前调用的 locals，所以此时符号 x 在 f_localsplus 中对应的值还是一个 NULL，没有指向一个合法的 PyObject。换句话说就是，知道里面存在局部变量 x，但是还没有来得及赋值。 然后在更新名字空间的时候，如果发现值是个 NULL，那么就把名字空间中该变量对应的键值对给删掉。 我们回顾一下 map_to_dict 函数： 所以 bar 函数执行 locals()[\"x\"] 的时候，会先获取名字空间，原本里面是有 \"x\": 1 这个键值对的。但因为赋值语句 x = 123 的存在，导致符号表里面存在 \"x\" 这个符号，但执行 locals() 的时候又尚未完成赋值，所以值为 NULL，于是又把这个键值对给删掉了。所以执行 locals()[\"x\"] 的时候，出现了 KeyError。 因为局部名字空间体现的是局部变量的值，而调用 locals 的时候，局部变量 x 还没有被创建。所以 locals() 里面不应该存在 key 为 \"x\" 的键值对，于是会将它删除。 我们将名字空间打印一下： def foo(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 但当前不存在局部变量，所以名字空间仍是 {\"x\": 1} print(locals()) def bar(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 由于里面存在局部变量 x，但尚未赋值 # 于是将字典中 key 为 \"x\" 的键值对给删掉 # 所以名字空间变成了 {} print(locals()) x = 123 foo() # {'x': 1}\nbar() # {} 上面代码中，局部变量的创建发生在 exec 之后，如果发生在 exec 之前也是相同的结果。 def foo(): exec(\"x = 2\") print(locals()) foo() # {'x': 2} def bar(): x = 1 exec(\"x = 2\") print(locals()) bar() # {'x': 1} 在 exec(\"x = 2\") 执行之后，名字空间也变成了 {\"x\": 2}。但从源码中我们看到，每次调用 locals，都会遍历符号表和 f_localsplus，对字典进行更新，所以在 bar 函数里面获取名字空间的时候，又把 \"x\" 对应的 value 给更新回来了。 当然这是在变量冲突的情况下，会保存真实存在的局部变量的值。但如果不冲突，比如 bar 函数里面是 exec(\"y = 2\")，那么 locals() 里面就会存在两个键值对。但只有 x 才是真正的局部变量，而 y 则不是。 将 exec(\"x = 2\") 换成 locals()[\"x\"] = 2 也是一样的效果，它们都是往局部名字空间中添加一个键值对，但不会创建一个局部变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 变量名冲突的问题","id":"270","title":"变量名冲突的问题"},"271":{"body":"当 Python 中混进一只薛定谔的猫…… ，这是猫哥在 19 年更新的一篇文章，里面探讨的内容我们本文的主题是重叠的。猫哥在文章中举了几个疑惑重重的例子，看看用上面学到的内容能不能合理地解释。 # 例 0\ndef foo(): exec('y = 1 + 1') z = locals()['y'] print(z) foo()\n# 输出：2 # 例 1\ndef foo(): exec('y = 1 + 1') y = locals()['y'] print(y) foo()\n# 报错：KeyError: 'y' 以上是猫哥文章中举的示例，首先例 0 很简单，因为 exec 影响了所在的局部名字空间，里面存在 \"y\": 2 这个键值对。至于里面的变量 z 则不影响，因为我们获取的是 \"y\" 这个 key 对应的 value。 但例 1 则不同，因为 Python 在语法解析的时候发现了 y = ... 这样的赋值语句，那么它在编译的时候就知道函数里面存在 y 这个局部变量，并写入符号表中。既然符号表中存在，那么调用 locals 的时候就会对它进行更新。但是对 y 赋值是发生在调用 locals 之后，所以在调用 locals 的时候，y 的值还是一个 NULL，也就是变量还没有赋值。所以会将名字空间中的 \"y\": 2 这个键值对给删掉，于是报出 KeyError 错误。 再来看看猫哥文章的例 2： # 例 2\ndef foo(): y = 1 + 1 y = locals()['y'] print(y) foo()\n# 输出：2 locals() 是对真实存在的局部变量的一个拷贝，在调用 locals 之前 y 就已经创建好了。符号表里面有 \"y\"，f_localsplus 里面有一个数值 2，所以调用 locals() 的时候，会得到 {\"y\": 2}，因此函数执行正常。 猫哥文章的例 3： # 例3\ndef foo(): exec('y = 1 + 1') boc = locals() y = boc['y'] print(y) foo()\n# KeyError: 'y' 这个例3 和例1 是一样的，只不过用变量 boc 将局部名字空间保存起来了。执行 exec 的时候，会创建局部名字空间，写入键值对 \"y\": 2。但调用 locals 的时候，发现函数内部存在局部变量 y 并且还尚未赋值，于是又会将 \"y\": 2 这个键值对给删掉，因此 boc 变成了一个空字典。 所以在执行 y = boc[\"y\"] 的时候会出现 KeyError。 猫哥文章的例 4： # 例4\ndef foo(): boc = locals() exec('y = 1 + 1') y = boc['y'] print(y) foo()\n# 输出：2 显然在调用 locals 的时候，会返回一个空字典，因为此时的局部变量都还没有赋值。但需要注意的是：boc 已经指向了局部名字空间（字典），而局部名字空间在一个函数里面也是唯一的。所以 exec(\"y = 1 + 1\") 执行之后，会往局部名字空间里面写入一个键值对，而变量 boc 指向的字典也会发生改变，因为是同一个字典，所以程序正常执行。 猫哥文章的例 5： # 例5\ndef foo(): boc = locals() exec('y = 1 + 1') print(locals()) y = boc['y'] print(y) foo()\n# {'boc': {...}} # KeyError: 'y' 首先在执行 boc = locals() 之后，boc 会指向一个空字典，然后 exec 函数执行之后会往字典里面写入一个键值对 \"y\": 2。如果在 exec 执行之后，直接执行 y = boc[\"y\"]，那么代码是没有问题的，但问题是执行之前插入了一个 print(locals())。 我们说过，当调用 locals 的时候，会对名字空间进行更新，然后返回更新之后的名字空间。由于函数内部存在 y = ... 这样的赋值语句，所以符号表中就存在 \"y\" 这个符号，于是会进行更新。但更新的时候，发现 y 还没有被赋值，于是又将字典中的键值对 \"y\": 2 给删掉了。 由于局部名字空间只有一份，所以 boc 指向的字典也会发生改变，换句话说在 print(locals()) 之后，boc 就指向了一个空字典，因此执行 y = boc[\"y\"] 时会出现 KeyError。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 薛定谔的猫","id":"271","title":"薛定谔的猫"},"272":{"body":"以上我们就探讨了 local 名字空间相关的内容，它是一个字典，是对真实存在的局部变量的一个拷贝，每当我们调用 locals，都会拷贝一次（但字典只会存在一份）。 然后函数的局部变量都是静态存储的，编译时就已经确定，无法在运行时动态添加。我们往局部名字空间里面添加键值对，并不等价于创建局部变量。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 小结","id":"272","title":"小结"},"273":{"body":"前面我们考察了虚拟机执行字节码指令的原理，那么本篇文章就来看看这些指令对应的逻辑是怎样的，每个指令都做了哪些事情。当然啦，由于字节码指令有一两百个，我们没办法逐一分析，这里会介绍一些常见的。至于其它的指令，会随着学习的深入，慢慢揭晓。 介绍完常见指令之后，我们会探讨 Python 赋值语句的背后原理，并分析它们的差异。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 楔子","id":"273","title":"楔子"},"274":{"body":"有一部分指令出现的频率极高，非常常用，我们来看一下。 LOAD_CONST：加载一个常量； LOAD_FAST：在局部作用域中加载一个局部变量； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量； LOAD_NAME：在全局作用域中加载一个全局变量或内置变量； STORE_FAST：在局部作用域中定义一个局部变量，来建立和某个对象之间的映射关系； STORE_GLOBAL：在局部作用域中定义一个使用 global 关键字声明的全局变量，来建立和某个对象之间的映射关系； STORE_NAME：在全局作用域中定义一个全局变量，来建议和某个对象之间的映射关系； 我们举例说明： import dis name = \"古明地觉\" def foo(): age = 16 print(age) global name print(name) name = \"古明地恋\" dis.dis(foo)\n\"\"\" 6 0 LOAD_CONST 1 (16) 2 STORE_FAST 0 (age) 7 4 LOAD_GLOBAL 0 (print) 6 LOAD_FAST 0 (age) 8 CALL_FUNCTION 1 10 POP_TOP 9 12 LOAD_GLOBAL 0 (print) 14 LOAD_GLOBAL 1 (name) 16 CALL_FUNCTION 1 18 POP_TOP 10 20 LOAD_CONST 2 ('古明地恋') 22 STORE_GLOBAL 1 (name) 24 LOAD_CONST 0 (None) 26 RETURN_VALUE\n\"\"\" 我们看到 age = 16 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 16； STORE_FAST：在局部作用域中创建一个局部变量，这里是 age； print(age) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_FAST：在局部作用域中加载一个局部变量，这里是 age； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； print(name) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 name； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； name = \"古明地恋\" 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 \"古明地恋\"； STORE_GLOBAL：在局部作用域中创建一个 global 关键字声明的全局变量，这里是 name； 这些指令非常常见，因为它们和常量、变量的加载，以及变量的定义密切相关，你写的任何代码在反编译之后都少不了它们的身影。 注：不管加载的是常量、还是变量，得到的永远是指向对象的指针。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 常用指令","id":"274","title":"常用指令"},"275":{"body":"这里再通过变量赋值感受一下字节码的执行过程，首先关于变量赋值，你平时是怎么做的呢？ 这些赋值语句背后的原理是什么呢？我们通过字节码来逐一回答。 1）a, b = b, a 的背后原理是什么？ 想要知道背后的原理，查看它的字节码是我们最好的选择。 1 0 LOAD_NAME 0 (b) 2 LOAD_NAME 1 (a) 4 ROT_TWO 6 STORE_NAME 1 (a) 8 STORE_NAME 0 (b) 10 LOAD_CONST 0 (None) 12 RETURN_VALUE 里面关键的就是 ROT_TWO 指令，虽然我们还没看这个指令，但也能猜出来它负责交换栈里面的两个元素。假设 a 和 b 的值分别为 22、33，看一下运行时栈的变化过程。 示意图还是很好理解的，关键就在于 ROT_TWO 指令，它是怎么交换元素的呢？ case TARGET(ROT_TWO): { // 获取栈顶元素 PyObject *top = TOP(); // 获取从栈顶开始的第二个元素（栈底元素） PyObject *second = SECOND(); // 将栈顶元素设置为 second，将栈的第二个元素设置为 top // 完成两个元素之间的交换 SET_TOP(second); SET_SECOND(top); FAST_DISPATCH();\n} 执行 ROT_TWO 指令之前，栈里有两个元素，栈顶元素是 a，栈底元素是 b。执行 ROT_TWO 指令之后，栈顶元素是 b，栈底元素是 a。然后后面的两个 STORE_NAME 会将栈里面的元素 b、a 依次弹出，赋值给 a、b，从而完成变量交换。 2）a, b, c = c, b, a 的背后原理是什么？ 老规矩，还是查看字节码，因为一切真相都隐藏在字节码当中。 1 0 LOAD_NAME 0 (c) 2 LOAD_NAME 1 (b) 4 LOAD_NAME 2 (a) 6 ROT_THREE 8 ROT_TWO 10 STORE_NAME 2 (a) 12 STORE_NAME 1 (b) 14 STORE_NAME 0 (c) 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 整个过程和 a, b = b, a 是相似的，首先 LOAD_NAME 将变量 c、b、a 依次压入栈中。由于栈先入后出的特性，此时栈的三个元素按照顺序（从栈顶到栈底）分别是 a、b、c。然后是 ROT_THREE 和 ROT_TWO，毫无疑问，这两个指令执行完之后，会将栈的三个元素调换顺序，也就是将 a、b、c 变成 c、b、a。最后 STORE_NAME 将栈的三个元素 c、b、a 依次弹出，分别赋值给 a、b、c，从而完成变量的交换。 因此核心就在 ROT_THREE 和 ROT_TWO 上面，由于后者上面已经说过了，所以我们看一下 ROT_THREE。 case TARGET(ROT_THREE): { PyObject *top = TOP(); PyObject *second = SECOND(); PyObject *third = THIRD(); SET_TOP(second); SET_SECOND(third); SET_THIRD(top); FAST_DISPATCH();\n} 栈顶元素是 top、栈的第二个元素是 second、栈的第三个元素是 third，然后将栈顶元素设置为 second、栈的第二个元素设置为 third、栈的第三个元素设置为 top。所以栈里面的 a、b、c 在经过 ROT_THREE 之后就变成了 b、c、a，显然这还不是正确的结果。于是继续执行 ROT_TWO，将栈的前两个元素进行交换，执行完之后就变成了 c、b、a。 假设 a、b、c 的值分别为 \"a\"、\"b\"、\"c\"，整个过程如下： 对于多元赋值来说，解释器的做法是固定的，首先按照从左往右的顺序，将等号右边的变量依次压入栈中，然后在栈里面对元素做处理，最后再将栈里的元素弹出，仍旧按照从左往右的顺序，依次赋值给等号左边的变量。 另外这里为了交换栈里的三个元素，使用了两个指令，但其实一个指令就够了，只需将栈顶元素和栈底元素进行交换即可，因为中间的元素是不需要动的。而在之后的版本中，官方优化了这个逻辑。 3）a, b, c, d = d, c, b, a 的背后原理是什么？它和上面提到的 1）和 2）有什么区别呢？ 我们还是看一下字节码。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_TUPLE 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 将等号右边的变量，按照从左往右的顺序，依次压入栈中，但此时没有直接将栈里面的元素做交换，而是构建一个元组。因为往栈里面压入了四个元素，所以 BUILD_TUPLE 后面的 oparg 是 4，表示构建长度为 4 的元组。 case TARGET(BUILD_TUPLE): { // 元素从栈顶到栈底依次是 a、b、c、d PyObject *tup = PyTuple_New(oparg); if (tup == NULL) goto error; // 将元素依次弹出，弹出的顺序也是 a、b、c、d // 但是注意循环，元素是从后往前设置的 // 所以 item[3], item[2], item[1], item[0] = a, b, c, d while (--oparg >= 0) { PyObject *item = POP(); PyTuple_SET_ITEM(tup, oparg, item); } // 将元组 item 压入栈中，元组为 (d, c, b, a) PUSH(tup); DISPATCH();\n} 此时栈里面只有一个元素，指向一个元组。接下来是 UNPACK_SEQUENCE，负责对序列进行解包，它的指令参数也是 4，表示要解包的序列的长度为 4，我们来看看它的逻辑。 case TARGET(UNPACK_SEQUENCE): { PREDICTED(UNPACK_SEQUENCE); // seq：从栈里面弹出的元组 (d, c, b, a) // item：用于遍历元素 // items：指向一个 PyObject * 类型的数组 PyObject *seq = POP(), *item, **items; if (PyTuple_CheckExact(seq) && PyTuple_GET_SIZE(seq) == oparg) { // 获取元组内部的 ob_item 字段，元素就存储在它指向的数组中 items = ((PyTupleObject *)seq)->ob_item; // 遍历内部的每一个元素，并依次压入栈中 // 由于是从后往前遍历的，所以遍历的元素依次是 a b c d // 但在压入栈中之后，元素从栈顶到栈底就变成了 d c b a while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } else if (PyList_CheckExact(seq) && PyList_GET_SIZE(seq) == oparg) { // 该指令同样适用于列表，逻辑一样（一会儿会看到） items = ((PyListObject *)seq)->ob_item; while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } // ... Py_DECREF(seq); DISPATCH();\n} 最后 STORE_NAME 将 d c b a 依次弹出，赋值给变量 a b c d，从而完成变量交换。所以当交换的变量多了之后，不会直接在运行时栈里面操作，而是将栈里面的元素挨个弹出，构建元组；然后再按照指定顺序，将元组里面的元素重新压到栈里面。 假设变量 a b c d 的值分别为 1 2 3 4，我们画图来描述一下整个过程。 不管是哪一种做法，Python 在进行变量交换时所做的事情是不变的，核心分为三步走。首先将等号右边的变量，按照从左往右的顺序，依次压入栈中；然后对运行时栈里面元素的顺序进行调整；最后再将运行时栈里面的元素挨个弹出，还是按照从左往右的顺序，再依次赋值给等号左边的变量。 只不过当变量不多时，调整元素位置会直接基于栈进行操作；而当达到四个时，则需要额外借助于元组。 然后多元赋值也是同理，比如 a, b, c = 1, 2, 3，看一下它的字节码。 1 0 LOAD_CONST 0 ((1, 2, 3)) 2 UNPACK_SEQUENCE 3 4 STORE_NAME 0 (a) 6 STORE_NAME 1 (b) 8 STORE_NAME 2 (c) 10 LOAD_CONST 1 (None) 12 RETURN_VALUE 元组直接作为一个常量被加载进来了，然后解包，再依次赋值。 4）a, b, c, d = d, c, b, a 和 a, b, c, d = [d, c, b, a] 有区别吗？ 答案是没有区别，两者在反编译之后对应的字节码指令只有一处不同。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_LIST 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 前者是 BUILD_TUPLE，现在变成了 BUILD_LIST，其它部分一模一样，并且解包用的依旧是 UNPACK_SEQUENCE 指令，所以两者的效果是相同的。当然啦，由于元组的构建比列表快一些，因此还是推荐第一种写法。 5）a = b = c = 123 背后的原理是什么？ 如果变量 a、b、c 指向的值相同，比如都是 123，那么便可以通过这种方式进行链式赋值。那么它背后是怎么做的呢？ 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 STORE_NAME 2 (c) 12 LOAD_CONST 1 (None) 14 RETURN_VALUE 出现了一个新的字节码指令 DUP_TOP，只要搞清楚它的作用，事情就简单了。 case TARGET(DUP_TOP): { // 获取栈顶元素，注意是获取、不是弹出 // TOP：查看元素，POP：弹出元素 PyObject *top = TOP(); // 增加指向对象的引用计数 Py_INCREF(top); // 压入栈中 PUSH(top); FAST_DISPATCH();\n} 所以 DUP_TOP 干的事情就是将栈顶元素拷贝一份，再重新压到栈里面。另外不管链式赋值语句中有多少个变量，模式都是一样的。 我们以 a = b = c = d = e = 123 为例： 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 DUP_TOP 12 STORE_NAME 2 (c) 14 DUP_TOP 16 STORE_NAME 3 (d) 18 STORE_NAME 4 (e) 20 LOAD_CONST 1 (None) 22 RETURN_VALUE 将常量压入运行时栈，然后拷贝一份，赋值给 a；再拷贝一份，赋值给 b；再拷贝一份，赋值给 c；再拷贝一份，赋值给 d；最后自身赋值给 e。 当然啦，虽然 Python 一切皆对象，但拿到的都是指向对象的指针，所以这里拷贝的是指针。 以上就是链式赋值的秘密，其实没有什么好神奇的，就是将栈顶元素进行拷贝，再依次赋值。但是这背后有一个坑，就是给变量赋的值不能是可变对象，否则容易造成 BUG。 a = b = c = {} a[\"ping\"] = \"pong\"\nprint(a) # {'ping': 'pong'}\nprint(b) # {'ping': 'pong'}\nprint(c) # {'ping': 'pong'} 虽然 Python 一切皆对象，但对象都是通过指针来间接操作的。所以 DUP_TOP 是将字典的地址拷贝一份，而字典只有一个，因此最终 a、b、c 会指向同一个字典。 6）a is b 和 a == b 的区别是什么？ is 用于判断两个变量是不是引用同一个对象，也就是保存的对象的地址是否相等；而 == 则是判断两个变量引用的对象是否相等，等价于 a.__eq__(b) 。 Python 的变量在 C 看来只是一个指针，因此两个变量是否指向同一个对象，等价于 C 中的两个指针存储的地址是否相等； 而 Python 的 ==，则需要调用 PyObject_RichCompare，来比较它们指向的对象所维护的值是否相等。 这两个语句的字节码指令是一样的，唯一的区别就是指令 COMPARE_OP 的参数不同。 // a is b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 8 (is) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE // a == b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 2 (==) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 我们看到指令参数一个是 8、一个是 2，然后是 COMPARE_OP 指令的背后逻辑： case TARGET(COMPARE_OP): { // 弹出栈顶元素，这里是 b PyObject *right = POP(); // 显然 left 就是 a，因为 b 被弹出之后，a 就成为了新的栈顶元素 PyObject *left = TOP(); // 进行比较，比较结果为 res PyObject *res = cmp_outcome(tstate, oparg, left, right); // 减少 left 和 right 引用计数 Py_DECREF(left); Py_DECREF(right); // 将栈顶元素替换为 res SET_TOP(res); if (res == NULL) goto error; // 指令预测，暂时不用管，等介绍 if 控制流的时候再说 PREDICT(POP_JUMP_IF_FALSE); PREDICT(POP_JUMP_IF_TRUE); DISPATCH();\n} 所以逻辑很简单，核心就在 cmp_outcome 函数中。 // Python/ceval.c\nstatic PyObject *\ncmp_outcome(PyThreadState *tstate, int op, PyObject *v, PyObject *w)\n{ int res = 0; // op 就是 COMPARE_OP 指令的参数 switch (op) { // PyCmp_IS 是一个枚举变量，等于 8，定义在 Include/opcode.h 中 // 而 is 关键字，在 C 的层面就是一个 == 判断 case PyCmp_IS: res = (v == w); break; // is not 则对应 != case PyCmp_IS_NOT: res = (v != w); break; // in 关键字 case PyCmp_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; break; // not in 关键字 case PyCmp_NOT_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; res = !res; break; // except 关键字 case PyCmp_EXC_MATCH: if (PyTuple_Check(w)) { Py_ssize_t i, length; length = PyTuple_Size(w); for (i = 0; i < length; i += 1) { PyObject *exc = PyTuple_GET_ITEM(w, i); if (!PyExceptionClass_Check(exc)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } } else { if (!PyExceptionClass_Check(w)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } res = PyErr_GivenExceptionMatches(v, w); break; default: // 剩下的走 PyObject_RichCompare 逻辑 // 这是一个函数调用，比较对象维护的值是否相等 return PyObject_RichCompare(v, w, op); } v = res ? Py_True : Py_False; Py_INCREF(v); return v;\n} 我们实际举个栗子： a = 3.14\nb = float(\"3.14\")\nprint(a is b) # False\nprint(a == b) # True a 和 b 都是 3.14，两者是相等的，但不是同一个对象。 反过来也是如此，如果 a is b 成立，那么 a == b 也不一定成立。可能有人好奇，a is b 成立说明 a 和 b 指向的是同一个对象，那么 a == b 表示该对象和自己进行比较，结果应该始终是相等的呀，为啥也不一定成立呢？以下面两种情况为例： class Girl: def __eq__(self, other): return False g = Girl()\nprint(g is g) # True\nprint(g == g) # False __eq__ 返回 False，此时虽然是同一个对象，但是两者不相等。 import math\nimport numpy as np a = float(\"nan\")\nb = math.nan\nc = np.nan\nprint(a is a, a == a) # True False\nprint(b is b, b == b) # True False\nprint(c is c, c == c) # True False nan 是一个特殊的浮点数，意思是 not a number（不是一个数字），用于表示空值。而 nan 和所有数字的比较结果均为 False，即使是和它自身比较。 但需要注意的是，在使用 == 进行比较的时候虽然是不相等的，但如果放到容器里面就不一定了。举个例子： import numpy as np lst = [np.nan, np.nan, np.nan]\nprint(lst[0] == np.nan) # False\nprint(lst[1] == np.nan) # False\nprint(lst[2] == np.nan) # False\n# lst 里面的三个元素和 np.nan 均不相等 # 但是 np.nan 位于列表中，并且数量是 3\nprint(np.nan in lst) # True\nprint(lst.count(np.nan)) # 3 出现以上结果的原因就在于，元素被放到了容器里，而容器的一些 API 在比较元素时会先判定它们存储的对象的地址是否相同，即：是否指向了同一个对象。如果是，直接认为相等；否则，再去比较对象维护的值是否相等。可以理解为先进行 is 判断，如果结果为 True，直接判定两者相等；如果 is 操作的结果不为 True，再去进行 == 判断。 因此 np.nan in lst 的结果为 True，lst.count(np.nan) 的结果是 3，因为它们会先比较对象的地址。地址相同，则直接认为对象相等。 在用 pandas 做数据处理的时候，nan 是一个非常容易坑的地方。 提到 is 和 ==，那么问题来了，在和 True、False、None 比较时，是用 is 还是用 == 呢？由于 True、False、None 它们不仅是关键字，而且也被看做是一个常量，最重要的是它们都是单例的，所以我们应该用 is 判断。 另外 is 在底层只需要一个 == 即可完成，但 Python 的 ==，在底层则需要调用 PyObject_RichCompare 函数。因此 is 在速度上也更有优势，== 操作肯定比函数调用要快。 补充：判断对象是否相等，底层有两个常用的函数，分别是 PyObject_RichCompare 和 PyObject_RichCompareBool。 PyObject_RichCompare 是直接比较对象的值是否相等。而 PyObject_RichCompareBool 会先比较地址是否相等（即是否是同一个对象），如果是同一个对象，那么直接认为相等，否则再调用 PyObject_RichCompare 判断值是否相等。 对于容器的一些 API，在比较对象是否相等时，调用的都是 PyObject_RichCompareBool。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 变量赋值的具体细节","id":"275","title":"变量赋值的具体细节"},"276":{"body":"以上我们就分析了常见的几个指令，以及变量赋值的底层逻辑，怎么样，是不是对 Python 有更深的理解了呢。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 小结","id":"276","title":"小结"},"277":{"body":"前面我们分析了虚拟机执行字节码的原理，并且也介绍了不少指令，但这些指令都是从上往下顺序执行的，不涉及任何的跳转。而像流程控制语句，比如 if、for、while、try 等等，它们在执行时会发生跳转，因此 Python 底层一定还存在相应的跳转指令。 那么从现在开始，就来分析一下这些流程控制语句的实现原理，本文先来介绍 if 语句。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 楔子","id":"277","title":"楔子"},"278":{"body":"if 语句应该是最简单也是最常用的流程控制语句，那么它的字节码是怎么样的呢？当然这里的 if 语句指的是 if elif else 整体，里面的某个条件叫做该 if 语句的分支。 我们看一下 if 语句的字节码长什么样子。 import dis code_string = \"\"\"\nscore = 90 if score >= 85: print(\"Good\") elif score >= 60: print(\"Normal\") else: print(\"Bad\")\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译得到的字节码指令比较多，我们来慢慢分析。另外为了阅读方便，源代码行号就不显示了。 // 加载常量 90 并压入运行时栈 0 LOAD_CONST 0 (90) // 加载符号表中索引为 0 的符号 \"score\"，弹出运行时栈的栈顶元素 90 // 然后将两者绑定起来，存放在当前的名字空间中 2 STORE_NAME 0 (score) // 加载变量 score 4 LOAD_NAME 0 (score) // 加载常量 85 6 LOAD_CONST 1 (85) // 进行比较，操作符是 >=，这个指令之前介绍过的 8 COMPARE_OP 5 (>=) // 如果比较结果为 False，就进行跳转，从名字也能看出指令的含义 // 那么跳转到什么地方呢？指令参数 22 表示跳转到偏移量为 22 的指令 // 很明显，就是当前分支的下一个分支。关于具体是怎么跳转的，一会儿说 10 POP_JUMP_IF_FALSE 22 // 如果走到这里说明没有跳转，当前分支的条件为真，那么开始执行该分支内部的逻辑 // 以下 4 条指令对应 print(\"Good\") 12 LOAD_NAME 1 (print) 14 LOAD_CONST 2 ('Good') 16 CALL_FUNCTION 1 18 POP_TOP // if 语句只有一个分支会被执行，如果执行了某个分支，那么整个 if 语句就结束了 // 于是向前跳转 26 个偏移量，来到偏移量为 48 的指令 20 JUMP_FORWARD 26 (to 48) // 对应 score >= 60\n>> 22 LOAD_NAME 0 (score) 24 LOAD_CONST 3 (60) 26 COMPARE_OP 5 (>=) // 如果比较结果为假，跳转到偏移量为 40 的指令 28 POP_JUMP_IF_FALSE 40 // 以下 4 条指令对应 print(\"Normal\") 30 LOAD_NAME 1 (print) 32 LOAD_CONST 4 ('Normal') 34 CALL_FUNCTION 1 36 POP_TOP // 向前跳转 8 个偏移量，来到偏移量为 48 的指令 38 JUMP_FORWARD 8 (to 48) // 最后一个是 else 分支，而 else 分支没有判断条件\n>> 40 LOAD_NAME 1 (print) 42 LOAD_CONST 5 ('Bad') 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明 if 语句结束了，而下面也没有代码了，于是返回 // 每个代码块对应的指令的最后都有一个 return\n>> 48 LOAD_CONST 6 (None) 50 RETURN_VALUE 我们看到字节码偏移量之前有几个 >> 这样的符号，显然这是 if 语句中的每一个分支开始的地方。 经过分析，整个 if 语句的字节码指令还是很简单的。就是从上到下依次判断每一个分支，如果某个分支条件成立，就执行该分支的代码，执行完毕后结束整个 if 语句；否则跳转到下一个分支。 显然核心就在于 POP_JUMP_IF_FALSE 指令，我们看一下它的逻辑。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » if 字节码","id":"278","title":"if 字节码"},"279":{"body":"COMPARE_OP 执行完之后会将比较的结果压入运行时栈，而 POP_JUMP_IF_FALSE 指令则是将结果从栈顶弹出并判断真假。如果为假，那么跳到下一个分支，否则执行此分支的代码。 case TARGET(POP_JUMP_IF_FALSE): { PREDICTED(POP_JUMP_IF_FALSE); // 从栈顶弹出比较结果 PyObject *cond = POP(); int err; // 如果 cond is True，说明当前分支的条件成立，那么执行下一条指令 if (cond == Py_True) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is False，那么通过 JUMPTO 跳转到 if 语句的下一个分支 // 关于 JUMPTO 一会儿介绍 if (cond == Py_False) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 到这里说明 cond 不是布尔值，那么调用 PyObject_IsTrue 并判断结果是否为真 // PyObject_IsTrue(cond)：等价于 Python 的 bool(cond) is True err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 cond 的布尔值为真，那么返回 1，此时什么也不做 // 最后会调用 DISPATCH()，去执行下一条指令 if (err > 0) ; // 如果 cond 的布尔值为假，那么返回 0，跳转到下一个 if 分支 else if (err == 0) JUMPTO(oparg); else goto error; DISPATCH();\n} 逻辑不难理解，但是里面出现了判断对象布尔值的函数，我们补充一下。 // Objects/object.c // 等价于 Python 的 bool(v) is True\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身就是布尔值 True，返回 1 if (v == Py_True) return 1; // 如果 v 本身就是布尔值 False，返回 0 if (v == Py_False) return 0; // 如果 v 是 None，返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且实现了 nb_bool（对应 __bool__） // 那么调用，如果结果不为 0，返回 1，否则返回 0 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且实现了 mp_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且实现了 sq_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 如果以上条件都不满足，直接返回 1，比如自定义类的实例对象（默认为真） else return 1; // 如果 res > 0 返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} // not 底层也调用了 PyObject_IsTrue\nint\nPyObject_Not(PyObject *v)\n{ int res; // 如果 v 是真，res == 1，那么 res == 0 结果是 0 // 如果 v 是假，res == 0，那么 res == 0 结果是 1 // 相当于取反 res = PyObject_IsTrue(v); if (res < 0) return res; return res == 0;\n} // Objects/boolobject.c\nstatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // <class 'bool'> 是一个 Python 类，这里的 bool_new 便是它的构造函数 PyObject *x = Py_False; long ok; // 不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 只接收 0 ~ 1 个参数，如果不传，那么默认返回 False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 PyObject_IsTrue，所以我们说 if v 和 if bool(v) 是等价的 // 因为当 v 不是布尔值时，if v 对应的指令内部会调用 PyObject_IsTrue // 而 bool(v) 也会调用 PyObject_IsTrue，所以两者是等价的 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 调用 PyBool_FromLong 创建布尔值，ok 为 1 返回 True，为 0 返回 False return PyBool_FromLong(ok);\n} PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 相信你现在明白了为什么 if 后面不跟布尔值也是可以的，因为有一个 C 函数 PyObject_IsTrue，可以判断任意对象的真假。如果 if 后面跟着的不是布尔值，那么会自动调用该函数。另外由于 bool(v) 也会调用该函数，所以 if v 和 if bool(v) 是等价的。 注：没有 PyObject_IsFalse。 说完了 POP_JUMP_IF_FALSE 指令，再补充一个和它相似的指令叫 POP_JUMP_IF_TRUE，它表示当比较结果为真时，跳到下一个分支，否则执行当前分支的代码。可能有人觉得，这不对吧，比较结果为真，难道不应该执行当前分支的逻辑吗？所以 POP_JUMP_IF_TRUE 指令似乎本身就是矛盾的。 仔细想想你应该能够猜到原因，答案就是使用了 not。 import dis code_string = \"\"\"\nif 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" code_string = \"\"\"\nif not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 正常情况下如果比较结果为 False，则跳转到 if 语句的下一个分支，所以 POP_JUMP_IF_FALSE 指令是合理的。至于 POP_JUMP_IF_TRUE 指令从逻辑上似乎就不该存在，因为它和 if 语句本身是相矛盾的。但现在我们明白了，该指令其实是为 not 关键字准备的。如果比较结果为真，那么 not 取反就是假，于是跳转到 if 语句的下一个分支，所以整个逻辑依旧是正确的。 当然这里只有一个 not，即使有很多个 not 也是可以的，尽管这没太大意义。 import dis # 这里有 4 个 not，因为是偶数个，两两相互抵消\n# 所以结果等价于 if 2 > 1\ncode_string = \"\"\"\nif not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" # 这里有 5 个 not，因为是奇数个，两两相互抵消之后还剩下一个\n# 所以结果等价于 if not 2 > 1\ncode_string = \"\"\"\nif not not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 然后再看一下 POP_JUMP_IF_TRUE 指令的内部逻辑，显然它和 POP_JUMP_IF_FALSE 是类似的。 case TARGET(POP_JUMP_IF_TRUE): { PREDICTED(POP_JUMP_IF_TRUE); // 弹出栈顶元素 PyObject *cond = POP(); int err; // 如果 cond is False，那么 not 之后就是 True // 所以当前 if 分支成立，于是执行下一条指令 if (cond == Py_False) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is True，那么 not 之后就是 False // 因此跳转到下一个分支 if (cond == Py_True) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 说明 cond 不是布尔值，那么通过 PyObject_IsTrue 判断是否为真 // 为真返回 1，为假返回 0，出现错误的话返回 -1（基本不会发生） err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 err > 0，说明布尔值为真，但还要进行 not 取反，因此最终整体为假 // 所以会跳转到下一个分支 if (err > 0) { JUMPTO(oparg); } // 如果 err == 0，说明布尔值为假，那么 not 取反之后整体为真 // 因此会执行当前分支内的逻辑，所以此处什么也不用做，直接 DISPATCH() 到下一条指令即可 else if (err == 0) ; else goto error; DISPATCH();\n} 以上就是 POP_JUMP_IF_FALSE 和 POP_JUMP_IF_TRUE 的内部逻辑，可以说非常简单。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » POP_JUMP_IF_FALSE","id":"279","title":"POP_JUMP_IF_FALSE"},"28":{"body":"然后来说一说 Python 的 C API，这个非常关键。首先 Python 解释器听起来很高大上，但按照陈儒老师的说法，它不过就是用 C 语言写出的一个开源软件，从形式上和其它软件并没有本质上的不同。 比如你在 Windows 系统中打开 Python 的安装目录，会发现里面有一个二进制文件 python.exe 和一个动态库文件 python38.dll。二进制文件负责执行，动态库文件则包含了相应的依赖，当然编译的时候也可以把动态库里的内容统一打包到二进制文件中，不过大部分软件在开发时都会选择前者。 既然解释器是用 C 写的，那么在执行时肯定会将 Python 代码翻译成 C 代码，这是毫无疑问的。比如创建一个列表，底层就会创建一个 PyListObject 实例，比如调用某个内置函数，底层会调用对应的 C 函数。 所以如果你想搞懂 Python 代码的执行逻辑或者编写 Python 扩展，那么就必须要清楚解释器提供的 API 函数。而按照通用性来划分的话，这些 API 可以分为两种。 泛型 API； 特定类型 API； 泛型 API 顾名思义，泛型 API 和参数类型无关，属于抽象对象层。这类 API 的第一个参数是 PyObject *，可以处理任意类型的对象，API 内部会根据对象的类型进行区别处理。 而且泛型 API 的名称也是有规律的，格式为 PyObject_###，我们举例说明。 所以泛型 API 一般以 PyObject_ 开头，第一个参数是 PyObject *，表示可以处理任意类型的对象。 特定类型 API 顾名思义，特定类型 API 和对象的类型是相关的，属于具体对象层，只能作用在指定类型的对象上面。因此不难发现，每种类型的对象，都有属于自己的一组特定类型 API。 // 通过 C 的 double 创建 PyFloatObject\nPyObject* PyFloat_FromDouble(double v); // 通过 C 的 long 创建 PyLongObject\nPyObject* PyLong_FromLong(long v);\n// 通过 C 的 char * 创建 PyLongObject\nPyObject* PyLong_FromString(const char *str, char **pend, int base) 以上就是解释器提供的两种 C API，了解完之后我们再来看看对象是如何创建的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 的 C API","id":"28","title":"Python 的 C API"},"280":{"body":"指令跳转是由 JUMPTO 实现的，它内部的逻辑长啥样呢？并且跳转除了 JUMPTO 之外，还有一个 JUMPBY，这两者有啥区别呢？ // Python/ceval.c #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 字节码指令的遍历是通过 next_instr 实现的，如果将指令执行的方向代表前进的方向。 JUMPTO(x)：表示从头开始向前跳转 x 个偏移量。 JUMPBY(x)：表示从当前指令所在的位置向前跳转 x 个偏移量。 所以 JUMPTO 表示绝对跳转，JUMPBY 表示相对跳转。不难发现，JUMPTO 既可以向前跳转（偏移量增大），也可以向后跳转（偏移量减小）；而 JUMPBY 只能向前跳转。 假设参数为 n，当前指令的偏移量为 m。对于 JUMPTO 而言，跳转之后的偏移量始终为 2n，如果 m < 2n 就是向前跳转，m > 2n 就是向后跳转。但对于 JUMPBY 而言，由于它是从当前待执行的指令开始跳转的，所以只能向前跳转（偏移量增大）。 另外在看字节码指令的时候，我们还看到了一个 JUMP_FORWARD 指令，当某个分支执行完毕之后，会直接跳转到 if 语句结束的下一条指令。并且不同分支对应的 JUMP_FORWARD 指令的参数是不同的，所以它内部一定使用了相对跳转。 case TARGET(JUMP_FORWARD): { JUMPBY(oparg); FAST_DISPATCH();\n} 我们分析的没错，它内部就是调用了一个 JUMPBY，因为终点相同、但跳转的偏移量不同，所以只能是相对跳转。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » JUMPTO","id":"280","title":"JUMPTO"},"281":{"body":"通过引入计算跳转，可以避免不必要的匹配。因为整个指令集合是已知的，这就说明某条指令在执行时，便可知道它的下一条指令是什么。所以当前指令处理完后，可以直接跳转到下一条指令对应的处理逻辑中，这就是计算跳转。但如果不使用计算跳转，那么每次读取到指令后，都要进入 switch，顺序匹配一百多个 case 分支，找到匹配成功的那一个。 因此使用计算跳转可以避免不必要的匹配，既然提前知道下一条指令是啥了，那么直接精确跳转就行，无需多走一遍 switch。不过要想实现计算跳转，需要 GCC 支持标签作为值，即 goto *label_addr 用法，由于 label_addr 是一个标签地址，那么解引用之后就是标签了。至于具体会跳转到哪一个标签，取决于 label_addr 保存了哪一个标签的地址，因此这种跳转是动态的，在运行时决定跳转目标。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 虚拟机为每个指令的处理逻辑都定义了一个标签，对于计算跳转来说，goto 的结果是 *标签地址，这个地址是运行时计算得出的。我们举个例子，随便看一段字节码指令集。 比如当前正在执行 LOAD_FAST 指令，那么下一条指令可以是 STORE_FAST、LOAD_FAST 以及 BUILD_LIST 等。当开启计算跳转时： 如果下一条指令是 STORE_FAST，那么之后就会跳转到 STORE_FAST 对应的标签； 如果下一条指令是 LOAD_FAST，那么之后就会跳转到 LOAD_FAST 对应的标签； 如果下一条指令是 BUILD_LIST，那么之后就会跳转到 BUILD_LIST 对应的标签； 所以在运行时判断指令的值，获取对应的标签，从而实现精确跳转，这就是计算跳转。当然这些内容在剖析虚拟机执行字节码时已经说过了，这里再回顾一下。 接下来说一说指令预测，不难发现，如果是计算跳转，那么指令预测功能貌似没啥用，因为总是能精确跳转到下一条指令对应的标签中。没错，指令预测只有在不使用计算跳转的情况下有用，那什么是指令预测呢？ 在不使用计算跳转时，goto 后面必须是一个静态的标签，跳转位置在编译阶段便已经固定，换句话说一个指令执行完毕后要跳转到哪一个标签是写死的，不能保证跳转后的标签正好对应下一条指令的处理逻辑。比如 LOAD_FAST 的下一条指令可以是 STORE_FAST 和 BUILD_LIST，那么应该跳转到哪一个指令对应的标签中呢？ 正因为这种不确定性，绝大部分指令在执行完毕后都会直接跳转到 fast_next_opcode 标签，然后顺序匹配 case 分支。 但也有那么几个指令，由于彼此的关联性很强，很多时候都是成对出现的，面对这样的指令，虚拟机会进行预测。比如 A 和 B 两个指令的关联性很强，尽管 A 的下一条指令除了是 B 之外，也有可能是其它指令，但 B 出现的概率是最大的，因此虚拟机会预测下一条指令是 B 指令。于是在执行完 A 指令之后，会验证自己的预测是否正确，即检测下一条指令是否是 B 指令。如果预测对了，可以实现精确跳转，如果预测错了，就只能回到 switch 语句逐一匹配 case 分支了。 总结一下：指令在执行时，它的下一条指令是已知的，但是不固定，有多种可能。如果不使用计算跳转，由于 goto 后面必须是一个写死的标签，而下一条指令却不固定，那么只能选择进入 switch、顺序匹配 case 分支。但也有那么几对指令，关联性很强，虽然不能保证百分百，但值得做一次尝试，这便是指令预测。 当然啦，如果使用计算跳转，情况则不一样了，此时压根用不到指令预测。因为 goto 后面是 *标签地址，而地址是可以动态获取的。由于所有标签的地址都保存在了一个数组中，不管接下来要处理哪一条指令，都可以获取到对应的标签地址，实现精确跳转。 好，关于指令预测我们已经知道是啥了，那么在源码层面又是如何体现的呢？在 POP_JUMP_IF_FALSE 指令中，我们看到有这么一行逻辑。 里面有一个宏 PREDICTED。 // Python/ceval.c\n#define PREDICTED(op) PRED_##op: 这个宏展开之后又是一个标签，由于调用时结尾加了分号，所以这还是一个空标签。整体效果如下： 那么展开成一个标签有什么用呢？首先肯定是为了跳转，至于具体过程我们再看一下 COMPARE_OP 指令就明白了。 COMPARE_OP 指令上面已经介绍了，它会对两个对象进行比较，并将比较结果压入运行时栈。之后它做了指令预测，并且还预测了两次，因为虚拟机认为 COMPARE_OP 执行完之后大概率会执行 POP_JUMP_IF_FALSE 或 POP_JUMP_IF_TRUE，所以做了一个预测。而相关逻辑位于 PREDICT 中，看一下它长什么样子。 // Python/ceval.c // 如果开启计算跳转，那么指令预测不生效，因为本身就知道该跳转到哪个指令对应的标签\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n// 如果不开启计算跳转，那么会比较预测的指令和实际的指令是否相等\n// 所以 COMPARE_OP 指令处理逻辑里面的 PREDICT(POP_JUMP_IF_FALSE)\n// 就是在判断下一条指令是不是自己预测的 POP_JUMP_IF_FALSE\n// 如果是，说明预测成功，那么 goto PRED_POP_JUMP_IF_FALSE\n// 否则说明预测失败，那么会执行 DISPATCH()，然后 goto 到 switch 语句所在位置\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif 以上便是指令预测，说白了就是如果指令 A 和指令 B 具有极高的关联性（甚至百分百），那么执行完 A 指令后会判断下一条指令是不是 B。如果是，那么直接跳转即可，就省去了匹配 case 分支的时间，如果不是，那就只能挨个匹配了。 因为是静态跳转，goto 后面的标签是写死的，编译阶段就确定了，所以只有那种关联度极高的指令才会开启预测功能，因为预测成功的概率比较高。但如果指令 A 的下一条指令有多种可能（假设有 6 种），并且每种指令出现的概率还差不多，那么这时不管预测哪一个，成功的概率都只有 1/6。显然这就不叫预测了，这是在掷骰子，因此对于这样的指令，虚拟机不会为它开启预测功能。 比如 LOAD_FAST 的下一个指令可以是 STORE_FAST、LOAD_FAST、BUILD_LIST 等等，不管预测哪一种，成功的概率都不是特别高，因此它没有进行指令预测。 所以就一句话：只有 A 和 B 两个指令的关联度极高的时候，执行 A 之后才会预测下一条指令是否是 B。预测成功直接跳转，预测失败执行 DISPATCH()，跳转到 fast_next_opcode 标签，进入 switch 语句。 但如果使用了计算跳转，情况就不一样了，此时不会开启指令预测，或者说指令预测里的逻辑会变得无效。 很明显，使用计算跳转后，PREDICT(op) 不会产生任何效果，因此也可以理解为没有开启指令预测。而之所以不用预测，是因为执行 DISPATCH() 的时候，本身就可以精确跳转到指定位置。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 指令预测","id":"281","title":"指令预测"},"282":{"body":"本篇文章我们就分析了 if 语句的实现原理，总的来说不难理解。依旧是在栈桢中执行字节码，只是多了一个指令跳转罢了，至于怎么跳转、跳转到什么地方，全部都体现在字节码中。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 小结","id":"282","title":"小结"},"283":{"body":"在介绍 if 语句的时候，我们看到了最基本的控制流，其核心就是跳转。但是 if 只能向前跳转，而接下来介绍的 for、while 循环，指令是可以回退的，也就是向后跳转。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 楔子","id":"283","title":"楔子"},"284":{"body":"我们看一个简单的 for 循环的字节码。 import dis code_string = \"\"\"\nlst = [1, 2]\nfor item in lst: print(item)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译之后，字节码指令如下。 // 加载常量 1，压入运行时栈 0 LOAD_CONST 0 (1) // 加载常量 2，压入运行时栈 2 LOAD_CONST 1 (2) // 将运行时栈的元素弹出，构建长度为 2 的列表，并压入栈中 4 BUILD_LIST 2 // 将上一步构建的列表从栈顶弹出，并用符号 lst 与之绑定 // 到此 lst = [1, 2] 便完成了 6 STORE_NAME 0 (lst) // 从全局名字空间中加载 lst 8 LOAD_NAME 0 (lst) // 获取对应的迭代器，即 iter(lst) 10 GET_ITER // 开始 for 循环，将里面的元素依次迭代出来 // 如果迭代结束，向前跳转 12 个偏移量，来到偏移量为 26 的指令\n>> 12 FOR_ITER 12 (to 26) // 到这里说明上一步迭代出元素了 // 用符号 item 和迭代出的元素进行绑定 14 STORE_NAME 1 (item) // 对应 print(item) 16 LOAD_NAME 2 (print) 18 LOAD_NAME 1 (item) 20 CALL_FUNCTION 1 22 POP_TOP // 到此，一次遍历就完成了，那么跳转到偏移量为 12 的指令，进行下一轮循环 // 注意：上面的 FOR_ITER 指令和这里的 JUMP_ABSOLUTE 指令的参数都是 12 // 但它们有着不同，FOR_ITER 指令的参数 12 表示从当前位置向前跳转 12 个偏移量 // 而 JUMP_ABSOLUTE 指令的参数 12 表示跳转到偏移量为 12 个位置（或者说从开头跳转 12 个偏移量） 24 JUMP_ABSOLUTE 12\n>> 26 LOAD_CONST 2 (None) 28 RETURN_VALUE 我们直接从 10 GET_ITER 开始看起，首先 for 循环遍历的对象必须是可迭代对象，然后会调用它的 __iter__ 方法，得到迭代器。再不断地调用迭代器的 __next__ 方法，一步一步将里面的值全部迭代出来，当出现 StopIteration 异常时，for 循环捕捉，最后退出。 另外，我们说 Python 里面是先有值，后有变量，for 循环也不例外。循环的时候，先将迭代器中的元素迭代出来，然后再让变量 item 指向。因此包含 10 个元素的迭代器，需要迭代 11 次才能结束。因为 for 循环事先是不知道迭代 10 次就能结束的，它需要再迭代一次，发现没有元素可以迭代、并捕获抛出的 StopIteration 之后，才能结束。 for 循环遍历可迭代对象时，会先拿到对应的迭代器，那如果遍历的就是一个迭代器呢？答案是依旧调用 __iter__，只不过由于本身就是一个迭代器，所以返回的还是其本身。 将元素迭代出来之后，就开始执行 for 循环体的逻辑了。 执行完一轮循环之后，通过 JUMP_ABSOLUTE 跳转到字节码偏移量为 12、也就是 FOR_ITER 的位置开始下一次循环。这里我们发现它没有跳到 GET_ITER 那里，所以可以得出结论，for 循环在遍历的时候只会创建一次迭代器。 下面来看指令对应的具体逻辑： case TARGET(GET_ITER): { // 获取栈顶元素，即上一步压入的列表指针 PyObject *iterable = TOP(); // 调用 PyObject_GetIter，获取对应的迭代器 // 这个函数在介绍迭代器的时候已经说过了 // 等价于 iter = type(iterable).__iter__(iterable) PyObject *iter = PyObject_GetIter(iterable); Py_DECREF(iterable); // 将迭代器 iter 设置为栈顶元素 SET_TOP(iter); if (iter == NULL) goto error; // 指令预测，解释器认为下一条指令大概率是 FOR_ITER 或 CALL_FUNCTION PREDICT(FOR_ITER); PREDICT(CALL_FUNCTION); DISPATCH();\n} 当创建完迭代器之后，就正式进入 for 循环了。所以从 FOR_ITER 开始，进入了虚拟机层面上的 for 循环。 源代码中的 for 循环，在虚拟机层面也一定对应着一个相应的循环控制结构。因为无论进行怎样的变换，都不可能在虚拟机层面利用顺序结构来实现源码层面上的循环结构，这也可以看作是程序的拓扑不变性。 因此源代码是宏观的，虚拟机执行字节码是微观的，尽管两者的层级不同，但本质上等价的，是程序从一种形式到另一种形式的等价转换。 我们来看一下 FOR_ITER 指令对应的具体实现： case TARGET(FOR_ITER): { PREDICTED(FOR_ITER); // 从栈顶获取迭代器对象（指针） PyObject *iter = TOP(); // 调用迭代器类型对象的 tp_iternext，将迭代器内的元素迭代出来 PyObject *next = (*iter->ob_type->tp_iternext)(iter); // 如果 next != NULL，说明迭代到元素了，那么压入运行时栈 if (next != NULL) { PUSH(next); PREDICT(STORE_FAST); PREDICT(UNPACK_SEQUENCE); DISPATCH(); } // 否则说明迭代出现异常 if (_PyErr_Occurred(tstate)) { // 如果异常还不是 StopIteration，那么跳转到 error 标签 if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) { goto error; } else if (tstate->c_tracefunc != NULL) { call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); } // 否则说明是 StopIteration，那么证明迭代完毕，将异常清空 _PyErr_Clear(tstate); } // 迭代结束了，但运行时栈里面还有一个迭代器对象 // 那么要将它弹出，因此这里执行了 STACK_SHRINK(1) STACK_SHRINK(1); Py_DECREF(iter); // 跳转到 for 循环结束后的下一条指令 // 当前的指令为：12 FOR_ITER 12 (to 26) // 所以会通过 JUMPBY 实现一个相对跳转 // 从当前位置向前跳转 12 个偏移量，来到偏移量为 26 的指令 JUMPBY(oparg); PREDICT(POP_BLOCK); DISPATCH();\n} 在执行 FOR_ITER 的时候，如果迭代器没有耗尽，那么会迭代出元素，压入运行时栈，然后调用 DISPATCH() 去执行下一条指令。当一轮循环结束后，还要进行指令回退，从字节码中也看到了，for 循环遍历一次之后，会再次跳转到 FOR_ITER，而跳转所使用的指令就是 JUMP_ABSOLUTE，从名字也能看出这个指令会使用绝对跳转。 case TARGET(JUMP_ABSOLUTE): { PREDICTED(JUMP_ABSOLUTE); // 跳转到偏移量为 oparg 的指令 JUMPTO(oparg);\n#if FAST_LOOPS FAST_DISPATCH();\n#else DISPATCH();\n#endif\n} 之前介绍过 JUMPTO 和 JUMPBY 两个宏， #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个宏都表示跳转 x 个偏移量，但 JUMPTO 是从头开始跳转，所以只要 x 固定，那么跳转位置就始终是固定的。而 JUMPBY 表示从当前位置开始跳转，所以位置不同，跳转的结果也不同。 然后天下没有不散的宴席，随着迭代的进行，for 循环总有退出的那一刻，而这个退出的动作只能落在 FOR_ITER 的身上。在 FOR_ITER 指令执行的过程中，如果遇到了 StopIteration，就意味着迭代结束了。这个结果将导致虚拟机会将迭代器从运行时栈中弹出，同时执行一个 JUMPBY 动作，向前跳跃，在字节码的层面是向下，也就是偏移量增大的方向。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » for 控制流","id":"284","title":"for 控制流"},"285":{"body":"看完了 for，再来看看 while，并且我们还要分析两个关键字：break、continue。 import dis code_string = \"\"\"\na = 0\nwhile a < 10: a += 1 if a == 5: continue if a == 7: break print(a)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 看一下它的指令： // a = 0 0 LOAD_CONST 0 (0) 2 STORE_NAME 0 (a) // 比较 a < 10\n>> 4 LOAD_NAME 0 (a) 6 LOAD_CONST 1 (10) 8 COMPARE_OP 0 (<) // 如果 a < 10 为假，说明循环结束 // 跳转到偏移量为 50 的指令，内部会使用绝对跳转 10 POP_JUMP_IF_FALSE 50 // 到这里说明 while 条件成立，进入循环体 // 执行 a += 1 12 LOAD_NAME 0 (a) 14 LOAD_CONST 2 (1) 16 INPLACE_ADD 18 STORE_NAME 0 (a) // 比较 a == 5 20 LOAD_NAME 0 (a) 22 LOAD_CONST 3 (5) 24 COMPARE_OP 2 (==) // 如果 a == 5 为假，跳转到偏移量为 30 的指令 26 POP_JUMP_IF_FALSE 30 // 否则说明 a == 5 为真，执行 continue // 由于 continue 是立即进入下一轮循环 // 所以直接跳转到偏移量为 4 的指令，即 while 循环的开始位置 // 所以在虚拟机的层面，continue 就是一个跳转指令 28 JUMP_ABSOLUTE 4 // 比较 a == 7\n>> 30 LOAD_NAME 0 (a) 32 LOAD_CONST 4 (7) 34 COMPARE_OP 2 (==) // 如果 a == 7 为假，跳转到偏移量为 40 的指令 36 POP_JUMP_IF_FALSE 40 // 否则说明 a == 7 为真，执行 break // 因此直接跳转到偏移量为 50 的位置，即 while 循环结束后的下一条指令 38 JUMP_ABSOLUTE 50 // print(a)\n>> 40 LOAD_NAME 1 (print) 42 LOAD_NAME 0 (a) 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明一轮循环结束了，那么跳转到偏移量为 4 的位置，即 while 循环的开始位置 48 JUMP_ABSOLUTE 4 // 隐式的 return None\n>> 50 LOAD_CONST 5 (None) 52 RETURN_VALUE 有了 for 循环，再看 while 循环就简单多了，整体逻辑和 for 高度相似，当然里面还结合了 if。 刚才说了，尽管源代码和字节码的层级不同，但本质上是等价的，是程序从一种形式到另一种形式的等价转换。在源码中能看到的，在字节码当中也能看到。比如源代码中的 continue 会跳转到循环所在位置，那么在字节码中自然也会对应一个跳转指令。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » while 控制流","id":"285","title":"while 控制流"},"286":{"body":"以上我们就探讨了 Python 的两种循环，总的来说没什么难度，本质上还是跳转。只不过有时会通过 JUMPTO 进行绝对跳转，有时会通过 JUMPBY 进行相对跳转。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 小结","id":"286","title":"小结"},"287":{"body":"程序在运行的过程中，总是会不可避免地产生异常，此时为了让程序不中断，必须要将异常捕获掉。如果能提前得知可能会发生哪些异常，建议使用精确捕获，如果不知道会发生哪些异常，则使用 Exception 兜底。 另外异常也可以用来传递信息，比如生成器。 def gen(): yield 1 yield 2 return \"result\" g = gen()\nnext(g)\nnext(g)\ntry: next(g)\nexcept StopIteration as e: print(f\"返回值: {e.value}\") # 返回值: result 如果想要拿到生成器的返回值，我们需要让它抛出 StopIteration，然后进行捕获，再通过 value 属性拿到返回值。所以，Python 是将生成器的返回值封装到了异常里面。 之所以举这个例子，目的是想说明，异常并非是让人嗤之以鼻的东西，它也可以作为信息传递的载体。特别是在 Java 语言中，引入了 checked exception，方法的所有者还可以声明自己会抛出什么异常，然后调用者对异常进行处理。在 Java 程序启动时，抛出大量异常都是司空见惯的事情，并在相应的调用堆栈中将信息完整地记录下来。至此，Java 的异常不再是异常，而是一种很普遍的结构，从良性到灾难性都有所使用，异常的严重性由调用者来决定。 虽然在 Python 里面，异常还没有达到像 Java 异常那么高的地位，但使用频率也是很高的，下面我们就来剖析一下异常是怎么实现的？","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 楔子","id":"287","title":"楔子"},"288":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机，所以异常可以由编译器抛出，也可以由虚拟机剖出。如果是编译器抛出的异常，那么基本上都是 SyntaxError，即语法错误。 try: >>>\nexcept Exception as e: print(e) 比如上面这段代码，你会发现异常捕获根本没用，因为这是编译阶段就发生的错误，而异常捕获是在运行时进行的。当然语法不对属于低级错误，所以不会留到运行时。 然后是运行时产生的异常： try: 1 / 0\nexcept ZeroDivisionError: print(\"Division by zero\") 像这种语法正确，但程序执行时因逻辑出现问题而导致的异常，是可以被捕获的。对于我们来说，关注的显然是运行时产生的异常，比如 TypeError、IndexError 等等。 那么问题来了，异常本质上是什么呢？我们以列表为例，看看 IndexError 是怎么产生的。 lst = [1, 2, 3]\nprint(lst[3])\n\"\"\"\nIndexError: list index out of range\n\"\"\" 列表的最大索引是 2，但我们访问了索引为 3 的元素，虚拟机就知道不能再执行下去了，否则会访问非法内存。因此虚拟机的做法是：输出异常信息，结束进程。我们通过源码来验证一下： 在获取列表元素时发现索引不合法，就知道要抛出 IndexError 了，于是将异常写入到回溯栈中，并返回 NULL。正常情况下，返回值应该指向一个合法的对象，如果为 NULL，证明出现异常了。 此时虚拟机会将回溯栈里的异常抛出来（就是我们在控制台看到的那一抹鲜红），然后结束进程，这就是异常的本质。当然异常也是一个 Python 对象，虚拟机在退出前，会写入到 stderr 中。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常的本质是什么？","id":"288","title":"异常的本质是什么？"},"289":{"body":"当我们用 C 编写 Python 扩展时，如果想设置异常的话，该怎么做呢？首先设置异常之前，我们要知道有哪些异常。在 pyerrors.h 中，虚拟机内置了大量的异常，另外 Python 一切皆对象，因此异常也是一个对象。 有了异常之后，怎么写入呢？关于异常写入，底层也提供了相应的 C API。 PyErr_SetNone：设置异常，不包含提示信息。 PyErr_SetObject：设置异常，包含提示信息（Python 字符串）。 PyErr_SetString：设置异常，包含提示信息（C 字符串）。 PyErr_Occurred：检测回溯栈中是否有异常产生。 PyErr_Clear：将回溯栈中的异常清空，相当于 Python 的异常捕获。 PyErr_Fetch：将回溯栈中的异常清空，同时拿到它的 exc_type、exc_value、exc_tb。 PyErr_Restore：基于 exc_type、exc_value、exc_tb 设置异常。 我们以 PyErr_Restore 为例，看看异常的具体设置过程。 // Python/errors.c // PyErr_SetObject、PyErr_SetString 等等，最终都会调用 PyErr_Restore\nvoid\nPyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); _PyErr_Restore(tstate, type, value, traceback);\n} // 将异常设置在线程状态对象中\nvoid\n_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *traceback)\n{ PyObject *oldtype, *oldvalue, *oldtraceback; if (traceback != NULL && !PyTraceBack_Check(traceback)) { Py_DECREF(traceback); traceback = NULL; } // 获取线程状态对象中已存在的异常（可能为空） oldtype = tstate->curexc_type; oldvalue = tstate->curexc_value; oldtraceback = tstate->curexc_traceback; // 将新异常设置在线程状态对象中 tstate->curexc_type = type; tstate->curexc_value = value; tstate->curexc_traceback = traceback; // 减少旧异常的引用计数 Py_XDECREF(oldtype); Py_XDECREF(oldvalue); Py_XDECREF(oldtraceback);\n} 注意这里的 PyThreadState 对象，它是与线程相关的，但它只是线程信息的一个抽象描述，而真实的线程及状态肯定是由操作系统来维护和管理的。 但虚拟机在运行的时候总需要另外一些与线程相关的状态和信息，比如是否发生了异常等等，而这些信息显然操作系统是没办法提供的。而 PyThreadState 对象正是 Python 为线程准备的、在虚拟机层面保存线程状态信息的对象（后面简称线程状态对象、或者线程对象）。 当前活动线程（OS 原生线程）对应的 PyThreadState 对象可以通过 PyThreadState_GET 获得，在得到了线程状态对象之后，就将异常信息存放在里面。 关于线程相关的内容，后续会详细说。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常写入的一些 C API","id":"289","title":"异常写入的一些 C API"},"29":{"body":"创建对象可以使用泛型 API，也可以使用特定类型 API，比如创建一个浮点数。 使用泛型 API 创建 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type); 通过泛型 API 可以创建任意类型的对象，因为该类 API 和类型无关。那么问题来了，解释器怎么知道要给对象分配多大的内存呢？ 在介绍类型对象的时候我们提到，对象的内存大小、支持哪些操作等等，都属于元信息，而元信息会存在对应的类型对象中。其中 tp_basicsize 和 tp_itemsize 负责指定实例对象所需的内存空间。 // Include/objimpl.h // 创建定长对象\n#define PyObject_New(type, typeobj) \\ ( (type *) _PyObject_New(typeobj) )\n// 创建变长对象\n#define PyObject_NewVar(type, typeobj, n) \\ ( (type *) _PyObject_NewVar((typeobj), (n)) )\n/* 所以 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type) 等价于如下 * PyObject* pi = (PyObject *)_PyObject_New(&PyFloat_Type) */ 所以实际申请内存的动作由 _PyObject_New 和 _PyObject_NewVar 负责，看看它的逻辑。 // Objects/object.c\nPyObject *\n_PyObject_New(PyTypeObject *tp)\n{ PyObject *op; // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_SIZE(tp) op = (PyObject *) PyObject_MALLOC(_PyObject_SIZE(tp)); if (op == NULL) return PyErr_NoMemory(); // 设置对象的类型和引用计数 return PyObject_INIT(op, tp);\n} PyVarObject *\n_PyObject_NewVar(PyTypeObject *tp, Py_ssize_t nitems)\n{ PyVarObject *op; const size_t size = _PyObject_VAR_SIZE(tp, nitems); // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_VAR_SIZE(tp, nitems) op = (PyVarObject *) PyObject_MALLOC(size); if (op == NULL) return (PyVarObject *)PyErr_NoMemory(); // 设置对象的类型、引用计数和 ob_size return PyObject_INIT_VAR(op, tp, nitems);\n} // Include/objimpl.h\n#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) #define _PyObject_VAR_SIZE(typeobj, nitems) \\ _Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \\ (nitems)*(typeobj)->tp_itemsize, \\ SIZEOF_VOID_P)\n/* 类型对象的 tp_basicsize 字段表示它的实例对象的基础大小，即底层结构体的大小 * 对于像浮点数这种不可变的定长对象来说，显然大小就等于 PyFloat_Type 的 tp_basicsize * * 如果对象内部可以容纳指定数量的元素，比如元组，那么 tp_itemsize 便是每个元素的大小 * 对于元组来说，它的大小等于 tp_basicsize + 元素个数 * tp_itemsize，并且按照 8 字节对齐 */ 以上便是泛型 API 创建对象的流程，但泛型 API 属于通用逻辑，而内置类型的实例对象一般会采用特定类型 API 创建。 使用特定类型 API 创建 // 创建浮点数，值为 2.71\nPyObject* e = PyFloat_FromDouble(2.71);\n// 创建一个可以容纳 5 个元素的元组\nPyObject* tpl = PyTuple_New(5);\n// 创建一个可以容纳 5 个元素的列表\n// 当然这是初始容量，列表还可以扩容\nPyObject* lst = PyList_New(5); 和泛型 API 不同，使用特定类型 API 只能创建指定类型的对象，因为这种 API 是和类型绑定的。比如我们可以用 PyDict_New 创建一个字典，但不可能创建一个集合出来。 如果使用特定类型 API，那么可以直接分配内存。因为内置类型的实例对象，它们的定义在底层都是写死的，解释器对它们了如指掌，因此可以直接分配内存并初始化。 比如通过 e = 2.71 创建一个浮点数，解释器看到 2.71 就知道要创建 PyFloatObject 结构体实例，那么申请多大内存呢？显然是 sizeof(PyFloatObject)，直接计算一下结构体实例的大小即可。 // Include/floatobject.h\ntypedef struct { // ob_refcnt 占 8 字节，ob_type 也占 8 字节 PyObject_HEAD // 占 8 字节 double ob_fval;\n} PyFloatObject; 由于 PyFloatObject 只是在 PyObject 的基础上引入了一个 double 字段，用于维护浮点数的值，所以一个 PyFloatObject 实例的大小为 24 字节。既然内存大小知道，那么直接分配就可以了，分配之后再将 ob_refcnt 初始化为 1、将 ob_type 设置为 &PyFloat_Type、将 ob_fval 设置为 2.71 即可。 同理可变对象也是一样，因为字段都是固定的，容纳的元素个数也可以根据赋的值得到，所以内部的所有字段占用了多少内存可以算出来，因此也是可以直接分配内存的。 还是那句话，解释器对内置的数据结构了如指掌，因为这些结构在底层都是定义好的，源码直接写死了。所以解释器根本不需要借助类型对象去创建实例对象，它只需要在实例对象创建完毕之后，再将 ob_type 设置为指定的类型即可（让实例对象和类型对象建立联系）。 所以采用特定类型 API 创建实例的速度会更快，但这只适用于内置的数据结构，而我们自定义类的实例对象显然没有这个待遇。假设通过 class Person: 定义了一个类，那么在实例化的时候，显然不可能通过 PyPerson_New 去创建，因为底层压根就没有这个 API。这种情况下创建 Person 的实例对象就需要 Person 这个类型对象了，因此自定义类的实例对象如何分配内存、如何进行初始化，需要借助对应的类型对象。 总的来说，Python 内部创建一个对象有两种方式： 通过特定类型 API，适用于内置数据结构，即内置类型的实例对象。 通过调用类型对象去创建（底层会调用泛型 API），多用于自定义类型。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 对象是如何创建的","id":"29","title":"对象是如何创建的"},"290":{"body":"帧评估函数里面有一个巨型的 switch，负责执行字节码指令，如果执行出错，那么跳转到 error 标签。 如果在执行指令的时候出现了异常，那么会跳转到 error 这里，否则会跳转到其它地方。另外当出现异常时，会在线程状态对象中将异常信息记录下来，包括异常类型、异常值、回溯栈（traceback），这个 traceback 就是在 error 标签中调用 PyTraceBack_Here 创建的。 另外可能有人不清楚 traceback 是做什么的，我们举个 Python 的例子。 def h(): 1 / 0 def g(): h() def f(): g() f()\n\"\"\"\nTraceback (most recent call last): File \"/Users/.../main.py\", line 10, in <module> f() File \"/Users/.../main.py\", line 8, in f g() File \"/Users/.../main.py\", line 5, in g h() File \"/Users/.../main.py\", line 2, in h 1 / 0\nZeroDivisionError: division by zero\n\"\"\" 这是脚本运行时产生的错误输出，我们看到了函数调用的信息：比如在源代码的哪一行调用了哪一个函数，那么这些信息是从何而来的呢？没错，显然是 traceback 对象。虚拟机在处理异常的时候，会创建 traceback 对象，在该对象中记录栈帧的信息。虚拟机利用该对象来将栈帧链表中每一个栈帧的状态进行可视化，可视化的结果就是上面输出的异常信息。 而且我们发现输出的信息也是一个链状的结构，因为每一个栈帧都会对应一个 traceback 对象，这些 traceback 对象之间也会组成一个链表。 所以当虚拟机开始处理异常的时候，它首先的动作就是创建 traceback 对象，用于记录异常发生时活动栈帧的状态。创建方式是通过 PyTraceBack_Here 函数，它接收一个栈帧作为参数。 // Python/traceback.c\nint\nPyTraceBack_Here(PyFrameObject *frame)\n{ // 获取当前的异常对象，拿到它的 exc_type、exc_val、exc_tb PyObject *exc, *val, *tb, *newtb; PyErr_Fetch(&exc, &val, &tb); // 创建新的 traceback 对象，并和旧的 traceback 对象组成链表 newtb = _PyTraceBack_FromFrame(tb, frame); if (newtb == NULL) { _PyErr_ChainExceptions(exc, val, tb); return -1; } // 将异常设置在线程状态对象中 // 并且异常的 exc_type 和 exc_val 保持不变，但 traceback 是新的 traceback PyErr_Restore(exc, val, newtb); Py_XDECREF(tb); return 0;\n} 那么这个 traceback 对象究竟长什么样呢？ // Include/cpython/traceback.h\ntypedef struct _traceback { PyObject_HEAD struct _traceback *tb_next; struct _frame *tb_frame; int tb_lasti; int tb_lineno;\n} PyTracebackObject; 里面有一个 tb_next，所以很容易想到 traceback 也是一个链表结构。其实 traceback 对象的链表结构跟栈帧对象的链表结构是同构的、或者说一一对应的，即一个栈帧对象对应一个 traceback 对象。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 是什么？","id":"290","title":"traceback 是什么？"},"291":{"body":"在 PyTraceBack_Here 函数中我们看到，traceback 对象是通过 _PyTraceBack_FromFrame 创建的，那么秘密就隐藏在这个函数中。 // Python/traceback.c\n_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)\n{ assert(tb_next == NULL || PyTraceBack_Check(tb_next)); assert(frame != NULL); return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_lasti, PyFrame_GetLineNumber(frame));\n} static PyObject *\ntb_create_raw(PyTracebackObject *next, PyFrameObject *frame, int lasti, int lineno)\n{ PyTracebackObject *tb; if ((next != NULL && !PyTraceBack_Check(next)) || frame == NULL || !PyFrame_Check(frame)) { PyErr_BadInternalCall(); return NULL; } // 为 traceback 对象申请内存 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type); if (tb != NULL) { // 设置属性 Py_XINCREF(next); tb->tb_next = next; Py_XINCREF(frame); tb->tb_frame = frame; tb->tb_lasti = lasti; tb->tb_lineno = lineno; PyObject_GC_Track(tb); } return (PyObject *)tb;\n} tb_next 将两个 traceback 连接了起来，不过这个和栈帧的 f_back 正好相反，f_back 指向的是上一个栈帧，而 tb_next 指向的是下一个 traceback。 另外在 traceback 中，还通过 tb_frame 字段和对应的 PyFrameObject 对象建立了联系，当然还有最后执行完毕时的字节码偏移量、以及在源代码中对应的行号。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 创建","id":"291","title":"traceback 创建"},"292":{"body":"traceback 的创建我们知道了，那么它和栈帧对象是怎么联系起来的呢？我们还以之前的代码为例，来解释一下。 def h(): 1 / 0 def g(): h() def f(): g() f() 当执行到函数 h 的 1 / 0 这行代码时，底层会执行 BINARY_TRUE_DIVIDE 指令。 case TARGET(BINARY_TRUE_DIVIDE): { PyObject *divisor = POP(); PyObject *dividend = TOP(); // 调用了数值型对象的泛型 API PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); Py_DECREF(dividend); Py_DECREF(divisor); SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} // Objects/abctract.c\nPyObject *\nPyNumber_TrueDivide(PyObject *v, PyObject *w)\n{ return binary_op(v, w, NB_SLOT(nb_true_divide), \"/\");\n} #define NB_SLOT(x) offsetof(PyNumberMethods, x)\n// 最终会执行 (&PyLong_Type) -> tp_as_methods -> nb_true_divide\n// 即 long_true_divice 函数，看一下它的逻辑 // Objects/longobject.c\nstatic PyObject *\nlong_true_divide(PyObject *v, PyObject *w)\n{ // ... a_size = Py_ABS(Py_SIZE(a)); b_size = Py_ABS(Py_SIZE(b)); negate = (Py_SIZE(a) < 0) ^ (Py_SIZE(b) < 0); // 如果除数为 0，设置 ZeroDivisionError if (b_size == 0) { PyErr_SetString(PyExc_ZeroDivisionError, \"division by zero\"); goto error; } // ... error: return NULL;\n} 由于除数为 0，因此会通过 PyErr_SetString 设置一个异常进去，最终将异常类型、异常值、以及 traceback 保存到线程状态对象中。然后跳转到 error 标签，注意：当前是 long_true_divide 的 error 标签，然后会返回 NULL。 当 long_true_divide 返回 NULL 时，那么变量 quotient 拿到的就是 NULL，由于没有指向一个合法的 PyObject，虚拟机就意识到发生异常了，这时候会跳转到 error 标签。注意：这个 error 标签是帧评估函数里的 error 标签。 在里面会先取出线程状态对象中已有的 traceback 对象，然后以函数 h 的栈帧为参数，创建一个新的 traceback 对象，将两者通过 tb_next 关联起来。最后，再替换掉线程状态对象里面的 traceback 对象。 在虚拟机意识到有异常抛出，并创建了 traceback 之后，它会在当前栈帧中寻找 try except 语句，来执行开发人员指定的异常捕捉动作。如果没有找到，那么虚拟机将退出当前的活动栈帧，并沿着栈帧链回退到上一个栈帧（这里是函数 g 的栈帧），在上一个栈帧中寻找 try except 语句。 就像我们之前说的，函数调用会创建栈帧，当函数执行完毕或者出现异常时，会回退到上一级栈帧。一层一层创建、一层一层返回。至于回退的这个动作，则是在 _PyEval_EvalFrameDefault 的最后完成。 当出现异常时，虚拟机会进入 exception_unwind 标签寻找异常捕获逻辑，相关细节下一篇文章再说，这里就让它抛出去。然后来到 exit_returning 标签，将运行时栈清空。最后进入 exit_eval_frame 标签，将当前线程状态对象中的活跃栈帧设置为上一级栈帧，从而完成栈帧回退的动作。 当栈帧回退时，会进入函数 g 的栈帧，由于返回值为 NULL，所以知道自己调用的函数 h 的内部发生异常了（否则返回值一定会指向一个合法的 PyObject），那么继续寻找异常捕获语句。对于当前这个例子来说，显然是找不到的，于是会从线程状态对象中取出已有的 traceback 对象（函数 h 的栈帧对应的 traceback），然后以函数 g 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 异常会沿着栈帧链进行反向传播，函数 h 出现的异常被传播到了函数 g 中，显然接下来函数 g 要将异常传播到函数 f 中。因为函数 g 在无法捕获异常时，那么返回值也是 NULL，而函数 f 看到返回值为 NULL 时，同样会去寻找异常捕获语句。但是找不到，于是会从线程状态对象中取出已有的 traceback 对象（此时是函数 g 的栈帧对应的 traceback），然后以函数 f 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 最后再传播到模块对应的栈帧中，如果还无法捕获发生的异常，那么虚拟机就要将异常抛出来了。 这个沿着栈帧链不断回退的过程我们称之为栈帧展开，在栈帧展开的过程中，虚拟机不断地创建与各个栈帧对应的 traceback，并将其链接成链表。 由于没有异常捕获，那么接下来会调用 PyErr_Print。然后在 PyErr_Print 中，虚拟机取出维护的 traceback 链表，并进行遍历，将里面的信息逐个输出到 stderr 当中，最终就是我们在 Python 中看到的异常信息。 并且打印顺序是：.py文件、函数f、函数g、函数h。因为每一个栈帧对应一个 traceback，而栈帧又是往后退的，因此显然会从 .py文件对应的 traceback 开始打印，然后通过 tb_next 找到函数 f 对应的 traceback，依次下去。当异常信息全部输出完毕之后，解释器就结束运行了。 因此从链路的开始位置到结束位置，将整个调用过程都输出出来，可以很方便地定位问题出现在哪里。 另外，虽然 traceback 一直在更新（因为要对整个调用链路进行追踪），但是异常类型和异常值始终是不变的，就是函数 h 中抛出的 ZeroDivisionError: division by zero。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 栈帧展开","id":"292","title":"栈帧展开"},"293":{"body":"以上就是虚拟机抛异常的过程，异常在 Python 里面也是一个对象，和其它的实例对象并无本质区别。 exc = StopIteration(\"迭代结束了\")\nprint(exc.value) # 迭代结束了\nprint(exc.args) # ('迭代结束了',) exc = IndexError(\"索引越界了\")\nprint(exc.args) # ('索引越界了',) exc = Exception(\"不知道是啥异常，总之出问题了\")\nprint(exc.args) # ('不知道是啥异常，总之出问题了',) # 异常都有一个 args 属性，以元组的形式保存传递的参数 所谓抛出异常，就是将错误信息输出到 stderr 中，然后停止进程。并且除了虚拟机内部会抛出异常之外，我们还可以使用 raise 关键字手动引发一个异常。 def judge_score(score: int): if score > 100 or score < 0: raise ValueError(\"Score must be between 0 and 100\") 站在虚拟机的角度，score 取任何值都是合理的，但对于我们来说，希望 score 位于 0 ~ 100。那么当 score 不满足 0 ~ 100 时，就可以手动 raise 一个异常。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 小结","id":"293","title":"小结"},"3":{"body":"本文就说到这里，赶快下载 Python 3.8 源码，来和我一起学习 Python 吧（ヾ(◍°∇°◍)ﾉﾞ）。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"1. CPython 源码长什么样子？ » 小结","id":"3","title":"小结"},"30":{"body":"lst = [] 和 lst = list() 都会创建一个空列表，但这两种方式有什么区别呢？ 我们说创建实例对象可以通过解释器提供的特定类型 API，用于内置类型；也可以通过实例化类型对象去创建，既可用于自定义类型，也可用于内置类型。 # 通过特定类型 API 创建\n>>> lst = [] >>> lst\n[]\n# 通过调用类型对象创建\n>>> lst = list() >>> lst\n[] 还是那句话，解释器对内置数据结构了如指掌，并且做足了优化。 看到 123，就知道创建 PyLongObject 实例； 看到 2.71，就知道创建 PyFloatObject 实例； 看到 ( )，就知道创建 PyTupleObject 实例； 看到 [ ]，就知道创建 PyListObject 实例； ······ 这些都会使用特定类型 API 去创建，直接为结构体申请内存，然后设置引用计数和类型，所以使用 [ ] 创建列表是最快的。但如果使用 list() 创建列表，那么就产生了一个调用，要进行参数解析、类型检测、创建栈帧、销毁栈帧等等，所以开销会大一些。 import time start = time.perf_counter()\nfor _ in range(10000000): lst = []\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.2144167000001289\n\"\"\" start = time.perf_counter()\nfor _ in range(10000000): lst = list()\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.4079916000000594\n\"\"\" 通过 [ ] 的方式创建一千万次空列表需要 0.21 秒，但通过 list() 的方式创建一千万次空列表需要 0.40 秒，主要就在于 list() 是一个调用，而 [ ] 会直接被解析成 PyListObject，因此 [ ] 的速度会更快一些。 所以对于内置类型的实例对象而言，使用特定类型 API 创建要更快一些。而且事实上通过类型对象去创建的话，会先调用 tp_new，然后在 tp_new 内部还是调用了特定类型 API。 比如： 创建列表：可以是 list()、也可以是 [ ]； 创建元组：可以是 tuple()、也可以是 ( )； 创建字典：可以是 dict()、也可以是 { }； 前者是通过类型对象创建的，后者是通过特定类型 API 创建的。对于内置类型的实例对象而言，我们推荐使用特定类型 API 创建，会直接解析为对应的 C 一级数据结构，因为这些结构在底层都是已经实现好了的，可以直接用。而无需通过诸如 list() 这种调用类型对象的方式来创建，因为它们内部最终还是使用了特定类型 API，相当于多绕了一圈。 不过以上都是针对内置类型，而自定义的类型就没有这个待遇了，它的实例对象只能通过调用它自己创建。比如 Person 这个类，解释器不可能事先定义一个 PyPersonObject 然后将 API 提供给我们，所以我们只能通过调用 Person 来创建它的实例对象。 另外内置类型被称为静态类，它和它的实例对象在底层已经定义好了，无法动态修改。我们自定义的类型被称为动态类，它是在解释器运行的过程中动态构建的，所以我们可以对其进行动态修改。 事实上 Python 的动态性、GIL 等特性，都是解释器在将字节码翻译成 C 代码时动态赋予的，而内置类型在编译之后已经是指向 C 一级的数据结构，因此也就丧失了相应的动态性。不过与之对应的就是效率上的提升，因为运行效率和动态性本身就是鱼与熊掌的关系。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » [] 和 list()，应该使用哪种方式","id":"30","title":"[] 和 list()，应该使用哪种方式"},"31":{"body":"以上我们就简单分析了 Python 对象的创建过程，当然这只是一个开头，其背后还隐藏了大量的细节，我们后续会慢慢说。 下一篇文章来聊一聊，对象是如何被调用的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"31","title":"小结"},"32":{"body":"在上一篇文章中，我们分析了对象是如何创建的，主要有两种方式，一种是通过特定类型 API，另一种是通过调用类型对象。 对于内置类型的实例对象而言，这两种方式都是支持的，比如列表，我们既可以通过 [ ] 创建，也可以通过 list() 创建，前者是列表的特定类型 API，后者是调用类型对象。但对于自定义类的实例对象而言，我们只能通过调用类型对象的方式来创建。 而一个对象如果可以被调用，那么这个对象就是 callable，否则就不是 callable。那么问题来了，如果一个对象是 callable，那么它都具有哪些特征呢？ 从 Python 的角度看，如果对象是 callable，那么它的类型对象一定实现了 __call__ 函数； 从解释器的角度看，如果对象是 callable，那么它的类型对象的 tp_call 字段一定不为空。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"32","title":"楔子"},"33":{"body":"调用 int 可以创建一个整数，调用 str 可以创建一个字符串，调用 tuple 可以创建一个元组，调用自定义的类也可以创建出相应的实例对象，这就说明类型对象是可调用的，也就是 callable。既然类型对象可调用，那么类型对象的类型对象（type）内部一定实现了 __call__ 函数。 # int 可以调用，那么它的类型对象、也就是元类（type）一定实现了 __call__ 函数\nprint(hasattr(type, \"__call__\")) # True # 而调用一个对象，等价于调用其类型对象的 __call__ 函数\n# 所以 int(2.71) 实际上就等价于如下\nprint(type.__call__(int, 2.71)) # 2 我们说 int、str、float 这些都是类型对象（简单来说就是类），而 123、\"你好\"、2.71 是其对应的实例对象，这些都没问题。但如果相对 type 而言，int、str、float 是不是又成了实例对象呢？因为它们的类型都是 type。 所以 class 具有二象性： 如果站在实例对象（如：123、\"你好\"、2.71）的角度上，它是类型对象； 如果站在 type 的角度上，它是实例对象； 同理，由于 type 的类型还是 type，那么 type 既是 type 的类型对象，type 也是 type 的实例对象。虽然这里描述的有一些绕，但应该不难理解，而为了避免后续的描述出现歧义，这里我们做一个申明： 整数、浮点数、字符串、列表等等，我们称之为实例对象 int、float、str、dict，以及自定义的类，我们称之为类型对象 type 虽然也是类型对象，但我们称它为元类 由于 type 的内部定义了 __call__ 函数，那么说明类型对象都是可调用的，因为调用类型对象就是调用元类 type 的 __call__ 函数。而实例对象能否调用就不一定了，这取决于它的类型对象是否定义了 __call__ 函数，因为调用一个对象，本质上是调用其类型对象内部的 __call__ 函数。 class A: pass a = A()\n# 因为自定义的类 A 里面没有 __call__\n# 所以 a 是不可以被调用的\ntry: a()\nexcept Exception as e: # 告诉我们 A 的实例对象无法被调用 print(e) # 'A' object is not callable # 如果我们给 A 设置了一个 __call__\ntype.__setattr__(A, \"__call__\", lambda self: \"这是__call__\")\n# 发现可以调用了\nprint(a()) # 这是__call__ 这就是动态语言的特性，即便在类创建完毕之后，依旧可以通过 type 进行动态设置，而这在静态语言中是不支持的。所以 type 是所有类的元类，它控制了自定义类的生成过程，因此 type 这个古老而又强大的类可以让我们玩出很多新花样。 但对于内置的类，type 是不可以对其动态增加、删除或者修改属性的，因为内置的类在底层是静态定义好的。从源码中我们看到，这些内置的类、包括元类，它们都是 PyTypeObject 对象，在底层已经被声明为全局变量了，或者说它们已经作为静态类存在了。所以 type 虽然是所有类型对象的类型，但只有面对自定义的动态类，type 才具有对属性进行增删改的能力。 而且在上一篇文章中我们也解释过，Python 的动态性是解释器将字节码翻译成 C 代码的时候赋予的，因此给类对象动态设置属性只适用于动态类，也就是在 py 文件中使用 class 关键字定义的类。而对于静态类，它们在编译之后已经是指向 C 一级的数据结构了，不需要再被解释器解释了，因此解释器自然也就无法在它们身上动手脚，毕竟彪悍的人生不需要解释。 try: type.__setattr__(dict, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'dict' \"\"\" try: type.__setattr__(list, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'list' \"\"\" 同理其实例对象亦是如此，静态类的实例对象也不可以动态设置属性： lst = list()\ntry: lst.name = \"古明地觉\"\nexcept Exception as e: print(e) # 'list' object has no attribute 'name' 在介绍 PyTypeObject 结构体的时候我们说过，静态类的实例对象可以绑定哪些属性，已经写死在 tp_members 字段里面了。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从 Python 的角度看对象的调用","id":"33","title":"从 Python 的角度看对象的调用"},"34":{"body":"如果一个对象可以被调用，那么它的类型对象中一定要有 tp_call，更准确的说是 tp_call 字段的值是一个具体的函数指针，而不是 0。由于 PyList_Type 是可以调用的，这就说明 PyType_Type 内部的 tp_call 是一个函数指针，这在 Python 的层面我们已经验证过了，下面再来通过源码看一下。 在创建 PyType_Type 的时候，PyTypeObject 内部的 tp_call 字段被设置成了 type_call。所以当我们调用 PyList_Type 的时候，会执行 type_call 函数。 因此 list() 在 C 的层面上等价于： (&PyList_Type)->ob_type->tp_call(&PyList_Type, args, kwargs);\n// 即：\n(&PyType_Type)->tp_call(&PyList_Type, args, kwargs);\n// 而在创建 PyType_Type 的时候，给 tp_call 字段传递的是 type_call\n// 因此最终等价于\ntype_call(&PyList_Type, args, kwargs) 如果用 Python 来演示这一过程的话： # 以 list(\"abcd\") 为例，它等价于\nlst1 = list.__class__.__call__(list, \"abcd\")\n# 等价于\nlst2 = type.__call__(list, \"abcd\")\nprint(lst1) # ['a', 'b', 'c', 'd']\nprint(lst2) # ['a', 'b', 'c', 'd'] 这就是 list() 的秘密，相信其它类型在实例化的时候是怎么做的，你已经知道了，做法是相同的。 # dct = dict([(\"name\", \"古明地觉\"), (\"age\", 17)])\ndct = dict.__class__.__call__( dict, [(\"name\", \"古明地觉\"), (\"age\", 17)]\n)\nprint(dct) # {'name': '古明地觉', 'age': 17} # buf = bytes(\"hello world\", encoding=\"utf-8\")\nbuf = bytes.__class__.__call__( bytes, \"hello world\", encoding=\"utf-8\"\n)\nprint(buf) # b'hello world' 当然，目前还没有结束，我们还需要看一下 type_call 的源码实现。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从解释器的角度看对象的调用","id":"34","title":"从解释器的角度看对象的调用"},"35":{"body":"调用类型对象，本质上会调用 type.__call__，在底层对应 type_call 函数，因为 PyType_Type 的 tp_call 字段被设置成了 type_call。当然调用 type 也是如此，因为 type 的类型还是 type。 那么这个 type_call 都做了哪些事情呢？ // Objects/typeobject.c static PyObject *\ntype_call(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 参数 type 表示类型对象或者元类，假设调用的是 list，那么它就是 &PyList_Type // 参数 args 和 kwds 表示位置参数和关键字参数，args 是元组，kwds 是字典 // 指向创建的实例对象，当然也可能是类型对象，取决于参数 type // 如果参数 type 表示元类，那么 obj 会指向类型对象，并且是自定义的动态类 // 如果参数 type 表示类型对象，那么 obj 会指向实例对象 PyObject *obj; // 执行类型对象（也可能是元类）的 tp_new，也就是 __new__ // 如果不存在，那么会报错，而在 Python 中见到的报错信息就是这里指定的 if (type->tp_new == NULL) { PyErr_Format(PyExc_TypeError, \"cannot create '%.100s' instances\", type->tp_name); return NULL; } obj = type->tp_new(type, args, kwds); // 检测调用是否正常，如果调用正常，那么 obj 一定指向一个合法的 PyObject // 而如果 obj 为 NULL，则表示执行出错，此时解释器会抛出异常 obj = _Py_CheckFunctionResult((PyObject*)type, obj, NULL); if (obj == NULL) return NULL; // 这里要做一个额外判断： // 如果参数 type 是 &PyType_Type，也就是 Python 中的元类 // 那么它可以接收一个位置参数（查看对象类型），也可以接收三个位置参数（创建自定义类） // 所以当 type 是 &PyType_Type，位置参数的个数为 1，并且没有传递关键字参数时 // 那么表示查看对象的类型，此时直接返回 obj 即可 if (type == &PyType_Type && PyTuple_Check(args) && PyTuple_GET_SIZE(args) == 1 && (kwds == NULL || (PyDict_Check(kwds) && PyDict_GET_SIZE(kwds) == 0))) return obj; // 到这里说明不是查看对象类型，而是创建类或者实例 // 如果参数 type 是元类，那么表示创建类，此时 args 的长度必须为 3 // 如果参数 type 是类型对象，那么表示创建实例对象 // 所以为了描述方便，我们就假设参数 type 是类型对象，但我们知道它也可以是元类 // 总之到这里 __new__ 已经执行完了，那么之后该干啥了？显然是执行 __init__，但需要先做一个检测 // 如果 __new__ 返回的实例对象的类型不是当前类型，那么直接返回，不再执行 __init__ // 比如自定义 class A，那么在 __new__ 里面应该返回 A 的实例对象，但我们故意返回个 123 // 由于返回值的类型不是当前类型，那么不再执行初始化函数 __init__ if (!PyType_IsSubtype(Py_TYPE(obj), type)) return obj; // 走到这里说明类型一致，那么执行 __init__，将 obj、args、kwds 一起传过去 type = Py_TYPE(obj); if (type->tp_init != NULL) { int res = type->tp_init(obj, args, kwds); if (res < 0) { assert(PyErr_Occurred()); Py_DECREF(obj); obj = NULL; } else { assert(!PyErr_Occurred()); } } // 返回创建的对象 obj，当然准确来说是对象的泛型指针 // 因为 Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针 // 只是有时为了描述方便，我们会说成是对象，这一点我们心里清楚就好 return obj;\n} 所以整个过程就三步： 如果传递的是元类，并且只有一个参数，那么直接返回对象的类型； 否则先调用 tp_new 为实例对象申请内存； 再调用 tp_init（如果有）进行初始化，设置对象属性； 所以这对应了 Python 中的 __new__ 和 __init__，其中 __new__ 负责为实例对象开辟一份内存，然后返回指向对象的指针，并且该指针会自动传递给 __init__ 中的 self。 class Girl: def __new__(cls, name, age): print(\"__new__ 方法执行啦\") # 调用 object.__new__(cls) 创建 Girl 的实例对象 # 然后该对象的指针会自动传递给 __init__ 中的 self return object.__new__(cls) def __init__(self, name, age): print(\"__init__ 方法执行啦\") self.name = name self.age = age g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n__new__ 方法执行啦\n__init__ 方法执行啦\n古明地觉 16\n\"\"\" __new__ 里面的参数要和 __init__ 里面的参数保持一致，因为会先执行 __new__ ，然后解释器再将 __new__ 的返回值和传递的参数组合起来一起传给 __init__。因此从这个角度上讲，设置属性完全可以在 __new__ 里面完成。 class Girl: def __new__(cls, name, age): self = object.__new__(cls) self.name = name self.age = age return self g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n古明地觉 16\n\"\"\" 这样也是没问题的，不过 __new__ 一般只负责创建实例，设置属性应该交给 __init__ 来做，毕竟一个是构造函数、一个是初始化函数，各司其职。另外由于 __new__ 里面不负责初始化，那么它的参数除了 cls 之外，一般都会写成 *args 和 **kwargs。 然后再回过头来看一下 type_call 中的这两行代码： tp_new 应该返回该类型对象的实例对象，而且一般情况下我们是不重写 __new__ 的，会默认执行 object 的 __new__。但如果我们重写了，那么必须要手动返回 object.__new__(cls)。可如果我们不返回，或者返回其它的话，会怎么样呢？ class Girl: def __new__(cls, *args, **kwargs): print(\"__new__ 方法执行啦\") instance = object.__new__(cls) # 打印看看 instance 到底是个啥 print(\"instance:\", instance) print(\"type(instance):\", type(instance)) # 正确做法是将 instance 返回 # 但是我们不返回，而是返回一个整数 123 return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\n\"\"\"\n__new__ 方法执行啦\ninstance: <__main__.Girl object at 0x0000019A2B7270A0>\ntype(instance): <class '__main__.Girl'>\n\"\"\" 这里面有很多可以说的点，首先就是 __init__ 里面需要两个参数，但是我们没有传，却还不报错。原因就在于这个 __init__ 压根就没有执行，因为 __new__ 返回的不是 Girl 的实例对象。 通过打印 instance，我们知道了 object.__new__(cls) 返回的就是 cls 的实例对象，而这里的 cls 就是 Girl 这个类本身。所以我们必须要返回 instance，才会自动执行相应的 __init__。 我们在外部来打印一下创建的实例对象吧，看看结果： class Girl: def __new__(cls, *args, **kwargs): return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\nprint(g)\n\"\"\"\n123\n\"\"\" 我们看到打印的结果是 123，所以再次总结一下 tp_new 和 tp_init 之间的区别，当然也对应 __new__ 和 __init__ 的区别： tp_new：为实例对象申请内存，底层会调用 tp_alloc，至于对象的大小则记录在 tp_basicsize 字段中，而在 Python 里面则是调用 object.__new__(cls)，然后一定要将实例对象返回； tp_init：tp_new 的返回值会自动传递给 self，然后为 self 绑定相应的属性，也就是进行实例对象的初始化； 但如果 tp_new 返回的对象的类型不对，比如 type_call 的第一个参数接收的是 &PyList_Type，但 tp_new 返回的却是 PyTupleObject *，那么此时就不会执行 tp_init。对应上面的 Python 代码就是，Girl 的 __new__ 应该返回 Girl 的实例对象（指针）才对，但却返回了整数，因此类型不一致，不会执行 __init__。 所以都说类在实例化的时候会先调用 __new__，再调用 __init__，相信你应该知道原因了，因为在源码中先调用 tp_new，再调用 tp_init。所以源码层面表现出来的，和我们在 Python 层面看到的是一样的。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » type_call 源码解析","id":"35","title":"type_call 源码解析"},"36":{"body":"到此，我们就从 Python 和解释器两个层面剖析了对象是如何调用的，更准确的说，我们是从解释器的角度对 Python 层面的知识进行了验证，通过 tp_new 和 tp_init 的关系，来了解 __new__ 和 __init__ 的关系。 当然对象调用还不止目前说的这么简单，更多的细节隐藏在了幕后。后续我们会循序渐进，一点点地揭开它的面纱，并且在这个过程中还会不断地学习到新的东西。比如说，实例对象在调用方法的时候会自动将实例本身作为参数传递给 self，那么它为什么会传递呢？解释器在背后又做了什么工作呢？这些在之后的文章中都会详细说明。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"36","title":"小结"},"37":{"body":"之前我们提到了泛型 API，这类 API 的特点是可以处理任意类型的对象，举个例子。 // 返回对象的长度\nPyObject_Size\n// 返回对象的某个属性的值\nPyObject_GetAttr\n// 返回对象的哈希值\nPyObject_Hash\n// 将对象转成字符串后返回\nPyObject_Str 对应到 Python 代码中，就是下面这个样子。 # PyObject_Size\nprint(len(\"古明地觉\"))\nprint(len([1, 2, 3]))\n\"\"\"\n4\n3\n\"\"\" # PyObject_GetAttr\nprint(getattr(\"古明地觉\", \"lower\"))\nprint(getattr([1, 2, 3], \"append\"))\nprint(getattr({}, \"update\"))\n\"\"\"\n<built-in method lower of str object at 0x7f081aa7e920>\n<built-in method append of list object at 0x7f081adc1100>\n<built-in method update of dict object at 0x7f081aa8fd80>\n\"\"\" # PyObject_Hash\nprint(hash(\"古明地觉\"))\nprint(hash(2.71))\nprint(hash(123))\n\"\"\"\n8152506393378233203\n1637148536541722626\n123\n\"\"\" # PyObject_Str\nprint(str(\"古明地觉\"))\nprint(str(object()))\n\"\"\"\n古明地觉\n<object object at 0x7fdfa0209d10>\n\"\"\" 这些 API 能处理任意类型的对象，这究竟是怎么办到的？要想搞清楚这一点，还是要从 PyObject 入手。 我们知道对象在 C 看来就是一个结构体实例，并且结构体嵌套了 PyObject。 # 创建一个浮点数，让变量 var 指向它\nvar = 2.71\n# 创建一个列表，让变量 var 指向它\nvar = [1, 2, 3] 浮点数对应的结构体是 PyFloatObject，列表对应的结构体是 PyListObject，变量 var 是指向对象的指针。那么问题来了，凭啥一个变量可以指向不同类型的对象呢？或者说变量和容器里面为什么可以保存不同对象的指针呢？ 原因在前面的文章中解释的很详细了，因为对象的指针会统一转成 PyObject * 之后再交给变量保存，以创建列表为例。 当然创建浮点数也是同理，因此变量和容器里的元素本质上就是一个泛型指针 PyObject *。而对象的指针在交给变量保存的时候，也都会先转成 PyObject *，因为不管什么对象，它底层的结构体都嵌套了 PyObject。正是因为这个设计，变量才能指向任意的对象。 所以 Python 变量相当于一个便利贴，可以贴在任意对象上。 不过问题来了，由于对象的指针会统一转成 PyObject * 之后再交给变量保存，那么变量怎么知道自己指向的是哪种类型的对象呢？相信你肯定知道答案：通过 ob_type 字段。 对象对应的结构体可以有很多个字段，比如 PyListObject，但变量能看到的只有前两个字段。至于之后的字段是什么，则取决于对象的类型。 所以变量会先通过 ob_type 字段获取对象的类型，如果 ob_type 字段的值为 &PyList_Type，那么变量指向的就是 PyListObject。如果 ob_type 字段的值为 &PyFloat_Type，那么变量指向的就是 PyFloatObject，其它类型同理。当得到了对象的类型，那么再转成相应的指针即可，假设 ob_type 是 &PyList_Type，那么变量会再转成 PyListObject *，这样就可以操作列表的其它字段了。 所以我们再总结一下： 变量和容器里的元素只能保存相同的指针类型，而不同类型的对象，其底层的结构体是不同的。但这些结构体无一例外都嵌套了 PyObject，因此它们的指针会统一转成 PyObject * 之后再交给变量保存。 然后变量在操作对象时，会先通过 ob_type 判断对象的类型，假如是 &PyList_Type，那么会再转成 PyListObject *，其它类型同理。我们以获取列表元素为例： 相信你已经知道为什么泛型 API 可以处理任意类型的对象了，我们再以 PyObject_GetAttr 为例，它内部会调用类型对象的 tp_getattro。 // Objects/object.c // 等价于 getattr(v, name)\nPyObject *\nPyObject_GetAttr(PyObject *v, PyObject *name)\n{ // 获取对象 v 的类型对象 PyTypeObject *tp = Py_TYPE(v); // 属性名称必须是字符串 if (!PyUnicode_Check(name)) { PyErr_Format(PyExc_TypeError, \"attribute name must be string, not '%.200s'\", name->ob_type->tp_name); return NULL; } // 如果类型对象实现了 tp_getattro，那么进行调用 // 等价于 Python 中的 type(v).__getattr__(v, name) if (tp->tp_getattro != NULL) return (*tp->tp_getattro)(v, name); // 否则会退化为 tp_getattr，它要求属性名称必须是 C 字符串 // 不过 tp_getattr 已经废弃，应该使用 tp_getattro if (tp->tp_getattr != NULL) { const char *name_str = PyUnicode_AsUTF8(name); if (name_str == NULL) return NULL; return (*tp->tp_getattr)(v, (char *)name_str); } // 否则说明对象 v 没有该属性 PyErr_Format(PyExc_AttributeError, \"'%.50s' object has no attribute '%U'\", tp->tp_name, name); return NULL;\n} 函数先通过 ob_type 找到对象的类型，然后通过类型对象的 tp_getattro 调用对应的属性查找函数。所以对象的类型不同，PyObject_GetAttr 调用的属性查找函数也不同，而这就是泛型 API 能处理任意对象的秘密。 我们再以 Python 代码为例： class A: def __getattr__(self, item): return f\"class：A，item：{item}\" class B: def __getattr__(self, item): return f\"class：B，item：{item}\" a = A()\nb = B()\nprint(getattr(a, \"some_attr\"))\nprint(getattr(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\"\n# 以上等价于\nprint(type(a).__getattr__(a, \"some_attr\"))\nprint(type(b).__getattr__(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\" 在 Python 里的表现和源码是一致的，我们再举个 iter 的例子： data = [1, 2, 3]\nprint(iter(data))\nprint(type(data).__iter__(data))\n\"\"\"\n<list_iterator object at 0x7fb8200f29a0>\n<list_iterator object at 0x7fb8200f29a0>\n\"\"\" 如果一个对象支持创建迭代器，那么它的类型对象一定实现了 __iter__，通过 type(data) 可以获取到类型对象，然后再将 data 作为参数调用 __iter__ 即可。 所以通过 ob_type 字段，这些泛型 API 实现了类似多态的效果，一个函数，多种实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"9. 再探泛型 API，感受 Python 对象的设计哲学","id":"37","title":"9. 再探泛型 API，感受 Python 对象的设计哲学"},"38":{"body":"我们知道所有类型对象在底层都由结构体 PyTypeObject 实例化得到，但内部字段接收的值不同，得到的类型对象就不同。类型对象不同，那么实例对象的表现就不同，这也正是一种对象区别于另一种对象的关键所在。 比如 PyLong_Type 的 tp_iter 是空，那么整数就不是可迭代对象，而 PyList_Type 的 tp_iter 不是空，那么列表就是可迭代对象。再比如 PyLong_Type 和 PyFloat_Type，虽然内部都实现了 tp_hash，但它们是不同的类型，所以整数和浮点数的哈希值计算方式也不一样。 因此类型对象决定了实例对象的行为，比如能否调用、能否计算哈希值、能否迭代等等，这些都由类型对象决定。 PyTypeObject 里面定义了很多函数指针，比如 tp_call、tp_hash 等等，它们可能指向某个具体的函数，也可能为空。这些函数指针可以看做是类型对象所定义的操作，这些操作决定了其实例对象在运行时的行为。 class A: # tp_new def __new__(cls, *args, **kwargs): pass # tp_init def __init__(self): pass # tp_call def __call__(self): pass # tp_getattro def __getattr__(self, attr): pass # tp_setattro def __setattr__(self, key, value): pass ... ... 像 tp_call、tp_hash、tp_new 等字段会直接对应 Python 里的魔法函数，它们以双下划线开头、以双下划线结尾。但除了魔法函数之外，每种类型还可以有很多自定义的成员函数。 # 自定义 foo 和 bar\nclass A: def foo(self): pass def bar(self): pass # 当然内置类型也是如此\n# 像 str 定义了 join、split、upper 等\nprint(str.join)\nprint(str.split)\nprint(str.upper)\n# 像 list 定义了 append、extend，insert 等\nprint(list.append)\nprint(list.extend)\nprint(list.insert) 这些自定义的函数会一起保存在类型对象的 tp_methods 里面，负责让实例对象更具有表现力。另外需要补充的是，类型对象里面定义的是函数，也叫成员函数，但实例对象在获取之后会自动包装成方法。所以当提到魔法函数和魔法方法时，其实表达的是同一个意思，只不过一个是站在类的角度，一个是站在实例的角度。 所以实例对象能调用的方法都定义在类型对象里面，并且通过实例调用本质上就是一个语法糖，但用起来更加优雅。假设有一个类 A，实例对象为 a，那么 a.some() 底层会转成 A.some(a)，至于这背后的细节后续再聊。 但除了以上这些，PyTypeObject 还提供了三个字段。 每个字段分别指向一个结构体实例，结构体实例中有大量的字段，这些字段都是函数指针，指向了具体的函数。所以它们也被称为方法簇，分别应用于如下操作。 tp_as_number：负责数值型操作，比如整数、浮点数的加减乘除； tp_as_sequence：负责序列型操作，比如字符串、列表、元组等通过索引取值的行为； tp_as_mapping：负责映射型操作，比如字典通过 key 映射出 value； 我们以 tp_as_number 为例，它指向 PyNumberMethods 类型的结构体实例，那么这个结构体长什么样子呢？ // Include/cpython/object.h typedef struct { // __add__，对应 + 操作符，如 a + b binaryfunc nb_add; // __sub__，对应 - 操作符，如 a - b binaryfunc nb_subtract; // __mul__，对应 * 操作符，如 a * b binaryfunc nb_multiply; // __mod__，对应 % 操作符，如 a % b binaryfunc nb_remainder; // __divmod__，对应 divmode 函数，如 divmod(a, b) binaryfunc nb_divmod; // __power__，对应 ** 操作符，如 a ** b ternaryfunc nb_power; // __neg__，对应 - 操作符，如 -a unaryfunc nb_negative; // __pos__，对应 + 操作符，如 +a unaryfunc nb_positive; // __abs__，对应 abs 函数，如 abs(a) unaryfunc nb_absolute; // __bool__，如 bool(a) inquiry nb_bool; // __invert__，对应 ~ 操作符，如 ~a unaryfunc nb_invert; // __lshift__，对应 << 操作符，如 a << b binaryfunc nb_lshift; // __rshift__，对应 >> 操作符，如 a >> b binaryfunc nb_rshift; // __and__，对应 & 操作符，如 a & b binaryfunc nb_and; // __xor__，对应 ^ 操作符，如 a ^ b binaryfunc nb_xor; // __or__，对应 | 操作符，如 a | b binaryfunc nb_or; // __int__，如 int(a) unaryfunc nb_int; // ...\n} PyNumberMethods; 你看到了什么？是不是想到了 Python 里面的魔法方法，所以它们也被称为方法簇。 在 PyNumberMethods 这个方法簇里面定义了作为一个数值对象应该支持的操作，同理，在 PySequenceMethods 和 PyMappingMethods 中分别定义了作为一个序列对象和映射对象应该支持的操作，这两种对象的典型例子就是 list 和 dict。 所以，只要类型对象提供相关操作，实例对象便具备对应的行为，因为实例对象所调用的方法都是由类型对象提供的。 class Girl: def __init__(self, name, age): self.name = name self.age = age def say(self): pass def cry(self): pass g = Girl(\"古明地觉\", 16)\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16}\nprint(\"say\" in Girl.__dict__) # True\nprint(\"cry\" in Girl.__dict__) # True 实例对象的属性字典，只包含了一些在 __init__ 里面设置的属性而已，而实例能够调用的 say、cry 都是定义在类型对象中的。 因此一定要记住：类型对象定义的操作，决定了实例对象的行为。 class Int(int): def __getitem__(self, item): return item a = Int(1)\nb = Int(2) print(a + b) # 3\nprint(a[\"你好\"]) # 你好 继承了 int 的自定义类 Int 在实例化之后自然是一个数值对象，但 a[\"\"] 却是一个类似于字典才具有的行为，那为什么可以实现呢？原因就是我们重写了 __getitem__ 这个魔法函数，它在底层对应 PyMappingMethods 中的 mp_subscript 操作，因此最终 Int 实例对象表现的像一个字典一样。 归根结底就在于这几个方法簇都只是 PyTypeObject 的一个字段罢了，默认使用 PyTypeObject 结构体创建的 PyLong_Type 所生成的实例对象（整数）是不具备列表和字典的属性特征的。但我们通过继承 PyLong_Type，同时指定 __getitem__，使得构建出来的类型对象所生成的实例对象，同时具备多种属性特征，就是因为解释器支持这种做法。 自定义的类在底层也是 PyTypeObject 结构体实例，而在继承 int 的时候，将其内部定义的 PyNumberMethods 方法簇也继承了下来，而我们又单独实现了 PyMappingMethods 中的 mp_subscript。所以自定义类 Int 的实例对象具备了整数的全部行为，以及字典的部分行为（因为我们只实现了 __getitem__）。 下面再通过 PyLong_Type 实际考察一下： 整数对象支持数值操作，所以在创建 PyLong_Type 时，实现了 tp_as_number。但整数显然不支持序列和映射操作，因此字段 tp_as_sequence 和 tp_as_mapping 就是 0，相当于空。 而 tp_as_number 字段被赋值为 long_as_number，看一下它长什么样。 里面的 long_add、long_sub、long_mul 等等显然都是已经定义好的函数指针，在创建 PyNumberMethods 结构体实例 long_as_number 的时候，这些函数指针分别赋值给了字段 nb_add、nb_substract、nb_multiply 等等。然后创建完 long_as_number 之后，再将其指针交给 PyLong_Type 的 tp_as_number 字段。 因此整数在操作的时候，比如相加，会先通过 变量->ob_type->tp_as_number->nb_add 获取该操作对应的函数指针，其中 int 类型对象的 tp_as_number 字段的值是 &long_as_number，因此获取其字段 nb_add 的时候，拿到的就是 long_add 函数指针，然后调用。 同理 float 类型里的 tp_as_number 字段则被赋值成了 &float_as_number，获取 nb_add 字段的时候，拿到的就是 float_add 函数指针。不同类型的对象的行为不同，它们都有属于自己的一组方法簇。 最后再画一张图总结一下，假设有两个变量，分别是 e = 2.71 和 num = 666。 所以对象的行为是由其类型对象定义的操作所决定的，比如一个对象可以计算长度，那么它的类型对象要实现 __len__；一个对象可以转成整数，那么它的类型对象要实现 __int__ 或 __index__。 class A: def __len__(self): return 123 def __int__(self): return 456 a = A()\nprint(len(a)) # 123\nprint(int(a)) # 456\n# len(a) 在底层会执行 A.__len__(a)\n# int(a) 在底层会执行 A.__int__(a)\nprint(A.__len__(a)) # 123\nprint(A.__int__(a)) # 456 总之核心就是一句话：类型对象定义了哪些操作，决定了实例对象具有哪些行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"10. Python 对象的行为是怎么区分的？","id":"38","title":"10. Python 对象的行为是怎么区分的？"},"39":{"body":"如果对编程语言进行分类的话，一般可以分为静态语言和动态语言，也可以分为编译型语言和解释型语言。但个人觉得还有一种划分标准，就是是否自带垃圾回收。关于有没有垃圾回收，陈儒老师在《Python 2.5源码剖析》中，总结得非常好。 对于像 C 和 C++ 这类语言，程序员被赋予了极大的自由，可以任意地申请内存。但权力的另一面对应着责任，程序员最后不使用的时候，必须负责将申请的内存释放掉，并把无效指针设置为空。可以说，这一点是万恶之源，大量内存泄漏、悬空指针、越界访问的 bug 由此产生。 而现代的开发语言（比如 C#、Java）都带有垃圾回收机制，将开发人员从维护内存分配和清理的繁重工作中解放出来，开发者不用再担心内存泄漏的问题，但同时也被剥夺了和内存亲密接触的机会，并牺牲了一定的程序运行效率。不过好处就是提高了开发效率，并降低了 bug 发生的概率。 由于现在的垃圾回收机制已经非常成熟了，把对性能的影响降到了最低，因此大部分场景选择的都是带垃圾回收的语言。 而 Python 里面同样具有垃圾回收，只不过它是为引用计数机制服务的。所以解释器通过引用计数和垃圾回收，代替程序员进行繁重的内存管理工作，关于垃圾回收我们后面会详细说，先来看一下引用计数。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 楔子","id":"39","title":"楔子"},"4":{"body":"在学习 Python 的时候，你肯定听过这么一句话：Python 中一切皆对象。没错，在 Python 世界里，一切都是对象。整数是一个对象、字符串是一个对象、字典是一个对象，甚至 int, str, list 以及我们使用 class 关键字自定义的类，它们也是对象。 像 int, str, list 等基本类型，以及自定义的类，由于它们可以表示类型，因此我们称之为类型对象；类型对象实例化得到的对象，我们称之为实例对象。但不管是哪种对象，它们都属于对象。因此 Python 将面向对象理念贯彻的非常彻底，面向对象中的类和对象在 Python 中都是通过对象实现的。 在面向对象理论中，存在着类和对象两个概念，像 int、dict、tuple、以及使用 class 关键字自定义的类型对象实现了面向对象理论中类的概念，而 123、3.14、\"string\" 等实例对象则实现了面向对象理论中对象的概念。但在 Python 里面，面向对象中的类和对象都是通过对象实现的。 我们举个例子： # dict 是一个类，因此它属于类型对象\n# 类型对象实例化得到的对象属于实例对象\nprint(dict)\n\"\"\"\n<class 'dict'>\n\"\"\"\nprint(dict(a=1, b=2))\n\"\"\"\n{'a': 1, 'b': 2}\n\"\"\" 因此可以用一张图来描述面向对象在 Python 中的体现。 而如果想查看一个对象的类型，可以使用 type，或者通过对象的 __class__ 属性。 data = [1, 2, 3]\n# 查看类型\nprint(type(data))\n\"\"\"\n<class 'list'>\n\"\"\"\nprint(data.__class__)\n\"\"\"\n<class 'list'>\n\"\"\" 如果想判断一个对象是不是指定类型的实例对象，可以使用 isinstance。 data = [1, 2, 3]\n# 判断是不是指定类型的实例对象\nprint(isinstance(data, list))\n\"\"\"\nTrue\n\"\"\" 但是问题来了，按照面向对象的理论来说，对象是由类实例化得到的，这在 Python 中也是适用的。既然是对象，那么就必定有一个类来实例化它，换句话说对象一定要有类型。至于一个对象的类型是什么，就看这个对象是被谁实例化的，被谁实例化，那么类型就是谁，比如列表的类型是 list，字典的类型是 dict 等等。 而 Python 中一切皆对象，所以像 int, str, tuple 这些内置的类对象也是具有相应的类型的，那么它们的类型又是谁呢？使用 type 查看一下就知道了。 print(type(int)) # <class 'type'>\nprint(type(str)) # <class 'type'>\nprint(type(dict)) # <class 'type'>\nprint(type(type)) # <class 'type'> 我们看到类型对象的类型，无一例外都是 type。而 type 我们也称其为元类，表示类型对象的类型。至于 type 本身，它的类型还是 type，所以它连自己都没放过，把自己都变成自己的对象了。 因此在 Python 中，你能看到的任何对象都是有类型的，可以使用 type 查看，也可以获取该对象的 __class__ 属性查看。所以：实例对象、类型对象、元类，Python 中任何一个对象都逃不过这三种身份。 到这里可能有人会发现一个有意思的点，我们说 int 是一个类对象，这显然是没有问题的。因为站在整数（比如 123）的角度上，int 是一个不折不扣的类对象；但如果站在 type 的角度上呢？显然我们又可以将 int 理解为实例对象，因此 class 具有二象性。 至于 type 也是同理，虽然它是元类，但本质上也是一个类对象。 注：不仅 type 是元类，那些继承了 type 的类也可以叫做元类。 然后 Python 中还有一个关键的类型（对象），叫做 object，它是所有类型对象的基类。不管是什么类，内置的类也好，我们自定义的类也罢，它们都继承自 object。因此 object 是所有类型对象的基类、或者说父类。 那如果我们想获取一个类都继承了哪些基类，该怎么做呢？方式有三种： class A: pass class B: pass class C(A): pass class D(B, C): pass # 首先 D 继承自 B 和 C, C 又继承 A\n# 我们现在要来查看 D 继承的父类 # 方法一: 使用 __base__\nprint(D.__base__) \"\"\"\n<class '__main__.B'>\n\"\"\" # 方法二: 使用 __bases__\nprint(D.__bases__) \"\"\"\n(<class '__main__.B'>, <class '__main__.C'>)\n\"\"\" # 方法三: 使用 __mro__\nprint(D.__mro__)\n\"\"\"\n(<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>)\n\"\"\" __base__：如果继承了多个类，那么只显示继承的第一个类，没有显式继承则返回 <class 'object'> __bases__：返回一个元组，会显示所有直接继承的父类，没有显式继承则返回 (<class 'object'>,) __mro__: mro（Method Resolution Order）表示方法查找顺序，会从自身出发，找到最顶层的父类。因此返回自身、继承的基类、以及基类继承的基类，一直找到 object 而如果想查看某个类型是不是另一个类型的子类，可以通过 issubclass。 print(issubclass(str, object))\n\"\"\"\nTrue\n\"\"\" 因此，我们可以得出以下两个结论： type 站在类型金字塔的最顶端，任何一个对象按照类型追根溯源，最终得到的都是 type； object 站在继承金字塔的最顶端，任何一个类型对象按照继承关系追根溯源，最终得到的都是 object； 但要注意的是，我们说 type 的类型还是 type，但 object 的基类则不再是 object，而是 None。 print(type.__class__) # <class 'type'> # 注：以下打印结果容易让人产生误解\n# 它表达的含义是 object 的基类为空\n# 而不是说 object 继承 None\nprint(object.__base__) # None 但为什么 object 的基类是 None，而不是它自身呢？其实答案很简单，Python 在查找属性或方法的时候，自身如果没有的话，会按照 __mro__ 指定的顺序去基类中查找。所以继承链一定会有一个终点，否则就会像没有出口的递归一样出现死循环了。 我们用一张图将对象之间的关系总结一下： 实例对象的类型是类型对象，类型对象的类型是元类； 所有类型对象的基类都收敛于 object； 所有对象的类型都收敛于 type； 因此 Python 算是将 一切皆对象 的理念贯彻到了极致，也正因为如此，Python 才具有如此优秀的动态特性。 但是还没结束，我们再重新审视一下上面那张图，会发现里面有两个箭头看起来非常的奇怪。object 的类型是 type，type 又继承了 object。 print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 因为 type 是所有类的元类，而 object 是所有类的基类，这就说明 type 要继承自 object，而 object 的类型是 type。很多人都会对这一点感到奇怪，这难道不是一个先有鸡还是先有蛋的问题吗？答案不是的，这两个对象是共存的，它们之间的定义是互相依赖的。而具体是怎么一回事，我们后续分析。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » Python 中一切皆对象","id":"4","title":"Python 中一切皆对象"},"40":{"body":"Python 一切皆对象，所有对象都有一个 ob_refcnt 字段，该字段维护着对象的引用计数，从而也决定对象的存在与消亡。下面来探讨一下引用计数，当然引用计数在介绍 PyObject 的时候说的很详细了，这里再回顾一下。 但需要说明的是，比起类型对象，我们更关注实例对象的行为。引用计数也是如此，只有实例对象，我们探讨引用计数才是有意义的。因为内置的类型对象超越了引用计数规则，永远都不会被析构，或者销毁，因为它们在底层是被静态定义好的。同理，自定义的类虽然可以被回收，但是探讨它的引用计数也是没有价值的。我们举个栗子： class A: pass del A 首先 del 关键字只能作用于变量，不可以作用于对象。比如 e = 2.71，可以 del e，但是不可以 del 2.71，这是不符合语法规则的。因为 del 的作用是删除变量，并将其指向的对象的引用计数减 1，所以我们只能 del 变量，不可以 del 对象。 至于 def、class 语句执行完之后拿到的也是变量，前面说了，Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针。比如上面代码中的 class A，它会先创建一个类对象，然后再让变量 A 指向这个类对象。所以我们拿到的 A 也是一个变量，只要是变量，就可以被 del。但是 del 变量只是删除了该变量，换言之就是让该变量无法再被使用，至于变量指向的对象是否会被回收，就看是否还有其它的变量也指向它。 总结：对象是否会被回收，完全由解释器判断它的引用计数是否为 0 所决定。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数","id":"40","title":"引用计数"},"41":{"body":"操作引用计数无非就是将其加一或减一，至于什么时候加一、什么时候减一，在介绍 PyObject 的时候已经说的很详细了。这里我们通过源码，看看引用计数具体是怎么操作的。 在底层，解释器会通过 Py_INCREF 和 Py_DECREF 两个宏来增加和减少对象的引用计数，而当对象的引用计数为 0 时，会调用对应的析构函数来销毁该对象，这个析构函数由对象的类型对象内部的 tp_dealloc 字段决定。 下面我们来看看底层实现，不过在介绍 Py_INCREF 和 Py_DECREF 之前，先来看几个其它的宏，这些宏非常常见，有必要单独说一下。 // Include/object.h // 将对象的指针转成 PyObject *\n#define _PyObject_CAST(op) ((PyObject*)(op))\n// 将对象的指针转成 PyVarObject *\n#define _PyVarObject_CAST(op) ((PyVarObject*)(op)) // 返回对象的引用计数，即对象的 ob_refcnt 字段\n#define Py_REFCNT(ob) (_PyObject_CAST(ob)->ob_refcnt)\n// 返回对象的类型，即对象的 ob_type 字段\n#define Py_TYPE(ob) (_PyObject_CAST(ob)->ob_type)\n// 返回对象的长度，即对象的 ob_size 字段\n#define Py_SIZE(ob) (_PyVarObject_CAST(ob)->ob_size) 然后再来看看 Py_INCREF 和 Py_DECREF，它们负责对引用计数执行加一和减一操作。 // Include/object.h // 将对象的 ob_refcnt 加 1\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op))\nstatic inline void _Py_INCREF(PyObject *op)\n{ _Py_INC_REFTOTAL; op->ob_refcnt++;\n} // 将对象的 ob_refcnt 减 1\n#define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))\ntatic inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ (void)filename; /* may be unused, shut up -Wunused-parameter */ (void)lineno; /* may be unused, shut up -Wunused-parameter */ _Py_DEC_REFTOTAL; // 将引用计数减 1 之后进行判断，如果结果不等于 0，则什么也不做 if (--op->ob_refcnt != 0) { // 正常情况下，Py_REF_DEBUG 宏不会被定义，因为引用计数不可能小于 0\n#ifdef Py_REF_DEBUG if (op->ob_refcnt < 0) { _Py_NegativeRefcount(filename, lineno, op); }\n#endif } // 否则说明引用计数为 0，意味着对象已经不被任何变量引用了，那么应该被销毁 else { // 调用 _Py_Dealloc 将对象销毁，这个 _Py_Dealloc 函数内部的逻辑很简单 // 虽然里面存在宏判断，但如果只看编译后的最终结果，那么代码就只有下面两行 /* destructor dealloc = Py_TYPE(op)->tp_dealloc; * (*dealloc)(op); */ // 会获取类型对象的 tp_dealloc，然后调用，销毁实例对象 _Py_Dealloc(op); }\n} 以上就是 Py_INCREF 和 Py_DECREF 两个宏的具体实现，但是它们不能接收空指针，如果希望能接收空指针，那么可以使用另外两个宏。 // Include/object.h #define Py_XINCREF(op) _Py_XINCREF(_PyObject_CAST(op))\nstatic inline void _Py_XINCREF(PyObject *op)\n{ if (op != NULL) { Py_INCREF(op); }\n} #define Py_XDECREF(op) _Py_XDECREF(_PyObject_CAST(op))\nstatic inline void _Py_XDECREF(PyObject *op)\n{ if (op != NULL) { Py_DECREF(op); }\n} 所以 Py_XINCREF 和 Py_XDECREF 会额外对指针做一次判断，如果为空则什么也不做，不为空再调用 Py_INCREF 和 Py_DECREF。而当一个对象的引用计数为 0 时，与该对象对应的析构函数就会被调用。 但要特别注意的是，我们上面说调用析构函数之后会回收对象，或者说销毁对象，意思是将这个对象从内存中抹去，但并不意味着要释放空间，也就是对象没了，但对象占用的内存却还在。 如果对象没了，占用的内存也要释放的话，那么频繁申请、释放内存空间会使 Python 的执行效率大打折扣，更何况 Python 已经背负了人们对其执行效率的不满这么多年。 所以 Python 底层大量采用了缓存池的技术，使用这种技术可以避免频繁地申请和释放内存空间。因此在析构的时候，只是将对象占用的空间放到缓存池中，并没有真的释放。 这一点，在后面剖析内置实例对象的实现中，将会看得一清二楚，因为大部分内置的实例对象都会有自己的缓存池。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数的相关操作","id":"41","title":"引用计数的相关操作"},"42":{"body":"到此我们就把这些基础概念说完了，后续你会发现目前花费的这些笔墨都是值得的，总之先对 Python 有一个宏观的认识，然后再学习具体的数据结构就简单多了。 所以从下一篇文章开始就要详细剖析内置对象的底层实现了，比如浮点数、复数、整数、布尔值、None、bytes 对象、bytearray 对象、字符串、元组、列表、字典、集合等等，所有的内置对象都会详细地剖析一遍，看看它是如何实现的。 有了目前为止的这些基础，我们后面就会轻松很多。先把对象、变量等概念梳理清楚，然后再来搞这些数据结构的底层实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 小结","id":"42","title":"小结"},"43":{"body":"从现在开始，我们就来分析 Python 的内置对象，看看它们在底层是如何实现的。但说实话，我们在前面几篇文章中介绍对象的时候，已经说了不少了，不过从现在开始要进行更深入的分析。 除了对象本身，还要看对象支持的操作在底层是如何实现的。我们首先以浮点数为例，因为它是最简单的，没错，浮点数比整数要简单，至于为什么，等我们分析整数的时候就知道了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 楔子","id":"43","title":"楔子"},"44":{"body":"要想搞懂浮点数的实现原理，就要知道它在底层是怎么定义的，当然在这之前我们已经见过它很多遍了。 // Include/floatobject.h\ntypedef struct { PyObject_HEAD double ob_fval;\n} PyFloatObject; 它包含了一个公共头部 PyObject 和一个 double 类型的 ob_fval 字段，毫无疑问这个 ob_fval 字段负责存储浮点数的具体数值。 我们以 e = 2.71 为例，底层结构如下。 还是很简单的，每个对象在底层都是由结构体表示的，这些结构体中有的字段负责维护对象的元信息，有的字段负责维护具体的值。比如这里的 2.71，总要有一个字段来存储 2.71 这个值，而这个字段就是 ob_fval。所以浮点数的结构非常简单，直接使用一个 C 的 double 来维护。 假设我们要将两个浮点数相加，相信你已经知道解释器会如何做了。通过 PyFloat_AsDouble 将两个浮点数的 ob_fval 抽出来，然后相加，最后再根据相加的结果创建一个新的 PyFloatObject 即可。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数的底层结构","id":"44","title":"浮点数的底层结构"},"45":{"body":"下面来看看浮点数是如何创建的，在前面的文章中，我们说内置对象可以使用对应的特定类型 API 创建，也可以通过调用类型对象创建。 调用类型对象 float 创建实例对象，解释器会执行元类 type 的 tp_call，它指向了 type_call 函数。然后 type_call 内部会先调用类型对象（这里是 float）的 tp_new 为其实例对象申请一份空间，申请完毕之后对象就创建好了。然后再调用 tp_init，并将实例对象作为参数传递进去，进行初始化，也就是设置属性。 但是对于 float 来说，它内部的 tp_init 字段为 0，也就是空。 这就说明 float 没有 __init__，因为浮点数太过简单，只需要一个 tp_new 即可。我们举个例子： class Girl1: def __init__(self, name, age): self.name = name self.age = age # __new__ 负责开辟空间、生成实例对象\n# __init__ 负责给实例对象绑定属性 # 但其实 __init__ 所做的工作可以直接在 __new__ 当中完成\n# 换言之有 __new__ 就足够了，其实可以没有__init__\n# 我们将上面的例子改写一下 class Girl2: def __new__(cls, name, age): instance = object.__new__(cls) instance.name = name instance.age = age return instance g1 = Girl1(\"古明地觉\", 16)\ng2 = Girl2(\"古明地觉\", 16)\nprint(g1.__dict__ == g2.__dict__) # True 我们看到效果是等价的，因为 __init__ 负责给 self 绑定属性，而这个 self 是 __new__ 返回的。那么很明显，我们也可以在 __new__ 当中绑定属性，而不需要 __init__。 但是按照规范，属性绑定应该放在 __init__ 中执行。只是对于浮点数而言，由于其结构非常简单，所以底层就没有给 float 实现 __init___，所有操作都是在 __new__ 当中完成的。 print(float.__init__ is object.__init__) # True\nprint(tuple.__init__ is object.__init__) # True\nprint(list.__init__ is object.__init__) # False 所以 float 没有 __init__，即便获取拿到的也是 object 的 __init__，因为 object 是 float 的基类。同理 tuple 也没有，但 list 是有的。 那么下面就来看一下 PyFloat_Type 的 tp_new，看它是如何创建浮点数的。通过 PyFloat_Type 的定义我们可以看到，在创建的时候给 tp_new 字段设置的是 float_new，那么一切秘密就隐藏在 float_new 里面。 // Objects/clinic/floatobject.c.h\nstatic PyObject *\nfloat_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)\n{ PyObject *return_value = NULL; PyObject *x = _PyLong_Zero; // float 不接收关键字参数，如果传递了，那么报错 if ((type == &PyFloat_Type) && !_PyArg_NoKeywords(\"float\", kwargs)) { goto exit; } // float 只接收 0 到 1 个位置参数，如果不满足，那么报错 if (!_PyArg_CheckPositional(\"float\", PyTuple_GET_SIZE(args), 0, 1)) { goto exit; } // 如果参数个数为 0，说明调用 float 时没传参数，那么直接跳转到 skip_optional 标签 // 由于变量 x 的值初始为 _PyLong_Zero，所以在 Python 中，float() 和 float(0) 是等价的 if (PyTuple_GET_SIZE(args) < 1) { goto skip_optional; } // 否则说明传递了一个参数，那么获取该参数 x = PyTuple_GET_ITEM(args, 0);\nskip_optional: // 调用 float_new_impl，拿到返回值 // 所以核心实现位于 float_new_impl 函数中 return_value = float_new_impl(type, x); exit: return return_value;\n} // Objects/floatobject.c\nstatic PyObject *\nfloat_new_impl(PyTypeObject *type, PyObject *x)\n{ // 如果 type 不是 &PyFloat_Type，那么必须是它的子类，否则调用 float_subtype_new 会报错 // 但该条件很少触发，因为创建的是浮点数，所以 type 自然是 &PyFloat_Type if (type != &PyFloat_Type) return float_subtype_new(type, x); // 然后检测 x 的类型，如果它是一个字符串，那么就根据字符串创建浮点数，比如 float(\"3.14\") if (PyUnicode_CheckExact(x)) return PyFloat_FromString(x); // 不是字符串，则调用 PyNumber_Float return PyNumber_Float(x);\n} 再来看看 PyNumber_Float。 // Objects/abstract.c\nPyObject *\nPyNumber_Float(PyObject *o)\n{ PyNumberMethods *m; // 如果传递的是 NULL，直接返回错误 if (o == NULL) { return null_error(); } // 如果传递的本身就是个浮点数，那么增加引用计数，直接返回 if (PyFloat_CheckExact(o)) { Py_INCREF(o); return o; } // 走到这里说明对象不是浮点数，那么它必须要能转成浮点数 // 也就是类型对象的内部要有 __float__ 这个魔法函数，即 nb_float // 获取方法簇 m = o->ob_type->tp_as_number; // 如果方法簇不为空，并且也实现了 nb_float if (m && m->nb_float) { // 那么获取 nb_float 指向的函数并调用，将对像转成浮点数 PyObject *res = m->nb_float(o); double val; // 如果 res 不为 NULL，并且是浮点数，那么返回 // PyFloat_CheckExact 负责检测一个对象的类型是否是 <class 'float'> // 其逻辑等价于 type(res) is float if (!res || PyFloat_CheckExact(res)) { return res; } // 走到这里说明 __float__ 返回的对象不是浮点数，即对象的类型不是 float // 如果不是 float，那么 float 的子类目前也是可以的（会抛警告） // PyFloat_Check 负责检测对象的类型是否是 float 或者其子类 // 其逻辑等价于 isinstance(res, float) if (!PyFloat_Check(res)) { // 如果返回的对象的类型不是 float 或者其子类，那么报错 PyErr_Format(PyExc_TypeError, \"%.50s.__float__ returned non-float (type %.50s)\", o->ob_type->tp_name, res->ob_type->tp_name); Py_DECREF(res); return NULL; } // 到这里说明返回的对象的类型是 float 的子类，此时也是合法的，但会抛出警告 if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, \"%.50s.__float__ returned non-float (type %.50s). \" \"The ability to return an instance of a strict subclass of float \" \"is deprecated, and may be removed in a future version of Python.\", o->ob_type->tp_name, res->ob_type->tp_name)) { Py_DECREF(res); return NULL; } // res 虽然是 float 子类的实例对象，但依旧具备浮点数的特征，因此将内部的数值抽出来 val = PyFloat_AS_DOUBLE(res); // 减少 res 指向对象的引用计数 Py_DECREF(res); // 创建 PyFloatObject 实例，并返回它的泛型指针 // 因此即使 __float__ 返回的是 float 子类的实例对象，也会默认转成 float 对象（浮点数）返回 return PyFloat_FromDouble(val); } // 如果 float 接收的参数没有实现 nb_float（__float__），那么会去找 nb_index（__index__） if (m && m->nb_index) { // 内部会调用对象的 nb_index PyObject *res = PyNumber_Index(o); if (!res) { return NULL; } // __index__ 返回的必须是整数 // 所以调用的是 PyLong_AsDouble，表示基于 Python 整数创建 C 浮点数 double val = PyLong_AsDouble(res); Py_DECREF(res); if (val == -1.0 && PyErr_Occurred()) { return NULL; } // 通过 C 浮点数创建 Python 浮点数 return PyFloat_FromDouble(val); } // 到这里说明对象没有实现 __float__ 和 __index__ // 那么检测传递的对象的类型是不是 float 的子类 // 如果是，证明它的结构和浮点数是一致的 // 直接根据 ob_fval 构建 PyFloatObject if (PyFloat_Check(o)) { return PyFloat_FromDouble(PyFloat_AS_DOUBLE(o)); } // 如果以上条件都不满足，说明它有可能是字节串、字节数组、字符串（但类型是 str 的子类）等等 // 那么直接交给 PyFloat_FromString return PyFloat_FromString(o);\n} 所以一个 float 调用居然要走这么多逻辑，总之解释器为我们考虑了很多。我们用 Python 来演绎一下： # 2.71 是一个字符串，所以在 float_new_impl 里面直接调用 PyFloat_FromString\nprint(float(\"2.71\")) # 2.71 class E: def __float__(self): return 2.71 # 传递的参数是一个 E 类型，所以会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_float，所以会直接调用\nprint(float(E())) # 2.71 class N: def __index__(self): return 3 # N 不是字符串类型，显然也会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_index，所以会直接调用\nprint(float(N())) # 3.0 class PI: class Float(float): pass def __float__(self): return self.Float(3.14) # 显然会调用内部的 __float__，但 __float__ 返回的不是 float 实例，而是 float 子类的实例\n# 虽然这种做法是允许的，但会抛出警告，警告的内容就是源码中描述的那样\n# DeprecationWarning: PI.__float__ returned non-float (type Float).\nprint(float(PI())) # 3.14 # 参数不是字符串，也没有实现 __float__ 和 __index__，那么直接执行 PyFloat_FromString\nprint(float(b\"1.414\")) # 1.414 以上是通过类型对象创建，但在底层实际上也是调用了对象的特定类型 APl。 PyObject *\nPyFloat_FromDouble(double); PyObject *\nPyFloat_FromString(PyObject *); PyFloat_FromDouble：基于 C 浮点数创建 Python 浮点数； PyFloat_FromString：基于字符串创建 Python 浮点数； 如果以 e = 2.71 这种方式创建，那么解释器在编译的时候就知道这是一个浮点数，因此会一步到胃，直接调用 PyFloat_FromDouble，然后在该函数内部会根据 C 的浮点数 2.71 创建对应的 PyFloatObject。而通过类型对象调用的话则会有一些额外的开销，因为这种方式最终也会调用相关的特定类型 API，但是在调用之前会干一些别的事情，比如类型检测等等。 所以 e = 2.71 比 float(2.71)、float(\"2.71\") 都要高效。 因此对于内置对象来说，可以调用它的类型对象去创建，这是最通用的逻辑。但这种做法会先兜个圈子，然后再去使用对象的特定类型 API，肯定没有直接使用特定类型 API 的效率高，也就是说 e = 2.71 这种方式是最快的，底层会直接调用 PyFloat_FromDouble。 对于其它对象也是同理，当然大部分情况下我们也都是使用特定类型 API 来创建的。以列表为例，比起 list()，我们更习惯使用［］。 还没结束，浮点数的实际创建过程我们还没有见到，因为最终还是调用特定类型 API 创建的。那么接下来就以 PyFloat_FromDouble 函数为例，看看浮点数在底层的创建过程。 // Objects/floatobject.c // 缓存池（链表）的最大长度，也就是缓存池最多能容纳多少个元素\n#define PyFloat_MAXFREELIST 100\n// 缓存池已经容纳了多少个元素，最多不能超过 PyFloat_MAXFREELIST\nstatic int numfree = 0;\n// 指向缓存池（链表）的头结点，因为缓存池是一个由 PyFloatObject 实例组成的链表\nstatic PyFloatObject *free_list = NULL;\n// 介绍引用计数时说过，引用计数如果为 0，那么对象会被销毁\n// 但是对象所占的内存则不一定释放，而是会缓存起来，浮点数也是如此\n// 销毁浮点数时，会将其放入缓存池中，创建浮点数时，也会优先从缓存池里面获取\n// 而缓存池是使用链表实现的，每一个节点都是一个 PyFloatObject 实例，然后 free_list 指向链表的头节点 PyObject *\nPyFloat_FromDouble(double fval)\n{ // 如果 op 不为 NULL，说明缓存池中有可用对象 PyFloatObject *op = free_list; if (op != NULL) { // 而一旦获取了，那么要维护 free_list，让它指向下一个节点 // 但问题来了，为啥获取下一个节点要通过 Py_TYPE，它不是负责返回 ob_type 吗？ // 相信你已经猜到原因了，因为 ob_type 充当了链表中的 next 指针 // 关于这里的细节，后续介绍缓存池的时候会详细说 free_list = (PyFloatObject *) Py_TYPE(op); // 然后还要将缓存池（链表）的节点个数减 1 numfree--; } else { // 否则说明缓存池里面没有空闲的可用对象，那么要重新申请内存 // PyObject_MALLOC 是基于 malloc 的一个封装，但对内存碎片做了优化 op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } // 走到这里说明内存分配好了，PyFloatObject 也创建了 // 但是不是还少了点啥呢？没错，显然内部的字段还没有初始化 // 还是那句话，内置类型的实例对象该分配多少空间，解释器了如指掌 // 因为通过 PyFloatObject 内部的字段一算就出来了 // 所以虽然对象创建了，但是 ob_refcnt、ob_type、以及 ob_fval 三个字段还没有初始化 // 因此还要将其 ob_refcnt 设置为 1，因为新创建的对象的引用计数是 1 // 以及将 ob_type 设置为指向 PyFloat_Type 的指针，因为它的类型是 float // 而 PyObject_INIT 专们用来设置 ob_refcnt 以及 ob_type，它的源码解释在下面 (void)PyObject_INIT(op, &PyFloat_Type); // 将内部的 ob_fval 字段设置为参数 fval，此时三个字段都已经初始化完毕 op->ob_fval = fval; // 变量是泛型指针 PyObject *，所以还要转成 PyObject * 之后才能返回 return (PyObject *) op;\n} // 补充：PyObject_INIT 的定义如下\n// Include/objimpl.h\n#define PyObject_INIT(op, typeobj) \\ _PyObject_INIT(_PyObject_CAST(op), (typeobj)) static inline PyObject*\n_PyObject_INIT(PyObject *op, PyTypeObject *typeobj)\n{ assert(op != NULL); // 设置实例对象的 ob_type Py_TYPE(op) = typeobj; // 如果 typeobj 是自定义的动态类，那么还要将类型对象的引用计数加 1 // 因为实例对象创建了，意味着类型对象会多一个引用 // 当然这只是针对于动态类，如果 typeobj 是内置的静态类型，那么不做处理 // 因为内置类型超越了引用计数规则，永远不会被析构 if (PyType_GetFlags(typeobj) & Py_TPFLAGS_HEAPTYPE) { Py_INCREF(typeobj); } // 将实例对象的引用计数初始化为 1 _Py_NewReference(op); return op;\n} // Objects/floatobject.c\nvoid\n_Py_NewReference(PyObject *op)\n{ if (_Py_tracemalloc_config.tracing) { _PyTraceMalloc_NewReference(op); } _Py_INC_REFTOTAL; // 初始化为 1 op->ob_refcnt = 1; _Py_AddToAllObjects(op, 1); _Py_INC_TPALLOCS(op);\n} 所以整体流程如下： 为实例对象分配内存空间，空间分配完了对象也就创建了，不过会优先使用缓存池； 初始化实例对象内部的引用计数和类型指针； 初始化 ob_fval 字段为参数 fval； 另外这里又体现了之前说的一个现象，对于自定义的类而言，想要创建实例对象必须要借助于类型对象。但使用特定类型 API 创建浮点数，却压根不需要类型对象 float，而是直接就创建了。创建完之后再让其 ob_type 字段指向 float，将类型和实例关联起来即可。 而之所以能这么做的根本原因就在于，内置类型的实例对象在底层都是静态定义好的，字段已经写死了，所以创建的时候不需要类型对象。解释器知道创建这样的对象需要分配多少内存，所以会直接创建，创建完之后再对内部字段进行初始化，比如设置引用计数和类型。 但对于我们自定义的类而言，想要创建实例对象就必须要借助于类型对象了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么创建的","id":"45","title":"浮点数是怎么创建的"},"46":{"body":"当删除一个变量时，解释器会通过函数 Py_DECREF 来减少该变量指向的对象的引用计数，并判断引用计数减一之后是否为 0，如果为 0 则调用其类型对象的 tp_dealloc 回收该对象。 // Include/object.h\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op)) static inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ // ... if (--op->ob_refcnt != 0) { // ... } else { _Py_Dealloc(op); }\n} // Objects/object.c\nvoid\n_Py_Dealloc(PyObject *op)\n{ destructor dealloc = Py_TYPE(op)->tp_dealloc; // 函数里面有个宏判断，编译展开之后就是下面这一行 (*dealloc)(op);\n} 所以当浮点数被销毁时，会调用 PyFloat_Type 的 tp_dealloc，这是显然的。而 PyFloat_Type 的 tp_dealloc 被初始化为 float_dealloc。 在 float_dealloc 函数内部我们会清晰地看到一个浮点数被销毁的全部过程，关于它的源代码，我们会在介绍缓存池的时候细说。总之到这里我们已经知道了浮点数被销毁的整个流程，下面来画张图描述一下。 以上就是浮点数对象被销毁的流程图，整个过程很简单。 在将对象的引用计数减 1 之后会判断是否为 0，如果为 0，则调用 _Py_Dealloc 销毁对象。而在 _Py_Dealloc 内部会获取对象的类型对象，然后拿到类型对象的 tp_dealloc 字段指向的函数。对于浮点数来说，这个函数就是 float_dealloc。 然后执行 float_dealloc(obj) 将对象销毁，但占用的空间会被缓存起来（取决于是否有缓存池以及缓存池的容量）。 所以整个流程理解起来没有任何难度，里面唯一没有说的就是 float_dealloc，即浮点数的具体销毁过程，这个等介绍缓存池的时候再一起说。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么销毁的","id":"46","title":"浮点数是怎么销毁的"},"47":{"body":"以上就是浮点数在底层的创建和销毁过程，下一篇文章来聊一聊浮点数的缓存池。当一些占用内存较小的对象在被销毁时，不会释放所占的内存，而是缓存起来。等下一次再使用的时候，直接从缓存池中获取，从而避免了频繁申请内存。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 小结","id":"47","title":"小结"},"48":{"body":"浮点数这种对象经常容易被创建和销毁，因为它很简单，使用频率高。如果每次创建都借助操作系统分配内存、每次销毁都借助操作系统回收内存的话，那效率会低到什么程度，可想而知。 因此 Python 解释器在操作系统之上封装了一个内存池，在内存管理的时候会详细介绍，目前可以认为内存池就是解释器预先向操作系统申请的一部分内存，专门用于小对象的快速创建和销毁，从而避免了频繁和操作系统打交道，这便是 Python 的内存池机制。 但浮点数的使用频率很高，并且使用时还会创建和销毁大量的临时对象，举个例子: a = 95.5\nb = 117.3\nc = 108.9 avg = (a + b + c) / 3 计算平均值的时候，会先计算 a + b，创建一个临时对象。接着让临时对象和 c 相加再创建一个临时对象，然后除以 3得到结果。最后销毁临时对象，并将结果交给变量 avg。 尽管我们平常很少注意到这些，但运算背后所产生的对象的创建和销毁的次数，比我们想象的要多。特别是在循环的时候，会伴随大量的对象创建和销毁操作， 如果每次创建和销毁对象都要伴随着内存操作，这个时候即便有内存池机制，效率也是不高的，因为使用内存池虽然可以不经过操作系统，但它也会增加解释器系统的开销。 因此解释器在浮点数对象被销毁后，并不急着回收对象所占用的内存，换句话说其实对象还在，只是将该对象放入一个空闲的链表中。之前我们说对象可以理解为一片内存空间，对象如果被销毁，那么理论上内存空间要归还给操作系统，或者回到内存池中。但 Python 考虑到效率，并没有真正地释放内存，而是将对象放入到链表中，占用的内存还在。 后续如果需要创建新的浮点数对象时，那么从链表中直接取出之前放入的对象（我们认为被回收的对象），然后根据新的浮点数对象重新初始化对应的字段即可，这样就避免了内存分配造成的开销。而这个链表就是我们说的缓存池，当然不光浮点数对象有缓存池，Python 的很多其它对象也有对应的缓存池，比如列表。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 楔子","id":"48","title":"楔子"},"49":{"body":"下面看一下浮点数的缓存池的具体细节。 // Objects/floatobject.c // 缓存池（链表）的最大长度\n// 因此池子里面最多容纳 100 个 PyFloatobject\n#define PyFloat_MAXFREELIST 100 // 缓存池已经容纳了多少个 PyFloatobject\nstatic int numfree = 0;\n// 指向缓存池（链表）的头节点\nstatic PyFloatObject *free_list = NULL; 我们观察一下 free_list，发现它是一个 PyFloatObect *，这就说明缓存池（链表）中的每一个节点都是 PyFloatObject 实例。但以我们刷 Leetcode 的经验，链表里的每个节点应该有一个 next 字段指向下一个节点，可 PyFloatObject 里面似乎并没有这样的字段啊。 相信你已经猜到原因了，因为解释器是使用 ob_type 字段来指向下一个对象。本来 ob_type 指向的应该是 PyFloat_Type，但在缓存池中指向的是下一个 PyFloatObject。 以上就是浮点数的缓存池，说白了就是一个链表，free_list 指向链表的头节点，节点之间通过 ob_type 字段充当 next 指针。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 缓存池的实现细节","id":"49","title":"缓存池的实现细节"},"5":{"body":"Python 的变量只是一个名字，如果站在 C 语言的角度来看，那么就是一个指针。所以 Python 的变量保存的其实是对象的内存地址，或者说指针，而指针指向的内存存储的才是对象。 所以在 Python 中，我们都说变量指向了某个对象。在其它静态语言中，变量相当于是为某块内存起的别名，获取变量等于获取这块内存所存储的值。而 Python 中变量代表的内存所存储的不是对象，而是对象的指针（或者说引用）。 我们举例说明，看一段 C 代码。 #include <stdio.h> void main()\n{ int a = 666; printf(\"address of a = %p\\n\", &a); a = 667; printf(\"address of a = %p\\n\", &a);\n} 编译执行一下： 赋值前后地址都是 0x7fff9eda521c，没有变化，再来看一段 Python 代码。 a = 666\nprint(hex(id(a))) # 0x7febf803a3d0 a = 667\nprint(hex(id(a))) # 0x7fec180677b0 我们看到 Python 里面输出的地址发生了变化，下面分析一下原因。 首先在 C 中，创建一个变量的时候必须规定好类型，比如 int a = 666，那么变量 a 就是 int 类型，以后在所处的作用域中就不可以变了。如果这时候再设置 a = 777，那么等于是把内存中存储的 666 换成 777，a 的地址和类型是不会变化的。 而在 Python 中，a = 666 等于是先开辟一块内存，存储的值为 666，然后让变量 a 指向这片内存，或者说让变量 a 保存这块内存的地址。然后 a = 777 的时候，再开辟一块内存，然后让 a 指向存储 777 的内存，由于是两块不同的内存，所以它们的地址是不一样的。 所以 Python 的变量只是一个和对象关联的名字，它代表的是对象的指针。换句话说 Python 的变量就是个便利贴，可以贴在任何对象上，一旦贴上去了，就代表这个对象被引用了。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量其实是指针","id":"5","title":"变量其实是指针"},"50":{"body":"我们以 PyFloat_FromDouble 这个 API 为例，再回顾一下浮点数的创建, // Objects/floatobject.c PyObject *\nPyFloat_FromDouble(double fval)\n{ // 获取缓存池的头结点指针 PyFloatObject *op = free_list; // 如果 op 不为 NULL，说明它指向了 PyFloatObject // 换句话说就是，缓存池里面有可用节点 if (op != NULL) { // 维护 free_list，让它指向链表的下一个节点 free_list = (PyFloatObject *) Py_TYPE(op); // 缓存池的节点个数减 1 numfree--; } else { op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } (void)PyObject_INIT(op, &PyFloat_Type); op->ob_fval = fval; return (PyObject *) op;\n} 在链表中，ob_type 被用于指向下一个节点，换言之 ob_type 保存的是下一个 PyFloatObject 的地址。不过话虽如此，可 ob_type 的类型仍是 PyTypeObject *。因此在存储的时候，PyFloatObject * 一定是先转成了 PyTypeObject *，之后再交给 ob_type 保存。因为对于指针来说，是可以任意转化的，我们一会儿看 float_dealloc 的时候就知道了。 那么同理，这里的 Py_TYPE(op) 在获取下一个节点的指针之后，还要再转成 PyFloatObject *，然后才能交给 free_list 保存。如果没有下一个对象了，那么 free_list 就是 NULL，在下一次分配的时候，上面的 if (op!=NULL) 就会不成立，从而走下面的 else，使用 PyObject_MALLOC 重新分配内存。 既然对象创建时可以从缓存池获取，那么销毁的时候，肯定要放入到缓存池中。而销毁对象时，会调用类型对象的 tp_dealloc（析构函数），对于浮点数而言就是 float_dealloc，我们看一下源代码。 static void\nfloat_dealloc(PyFloatObject *op)\n{ // 如果要放入浮点数的缓存池，那么它必须是浮点数 if (PyFloat_CheckExact(op)) { // 如果缓存池中的节点个数已经达到了 PyFloat_MAXFREELIST，那么直接释放掉 if (numfree >= PyFloat_MAXFREELIST) { PyObject_FREE(op); return; } // 否则放入到缓存池中 // 缓存池的节点个数加 1 numfree++; // 因为对象要成为链表的新头结点，那么它的 ob_type（充当 next）要指向当前头结点 // 所以将 ob_type 的值设置为 state->free_list 即可 // 但 ob_type 字段的类型为 PyTypeObject *，而 free_list 是 PyFloatobject * // 因此赋值之后，要将类型转换一下 Py_TYPE(op) = (struct _typeobject *)free_list; // 然后将 op 赋值为 state->free_list，也就是让 free_list 指向新的头结点 free_list = op; } // 如果销毁的对象不是浮点数，而是 float 子类的实例，那么直接释放内存 else Py_TYPE(op)->tp_free((PyObject *)op);\n} 以上便是浮点数缓存池的具体实现，说白了缓存池的作用只有一个，就是在对象被销毁的时候不释放所占的内存，下次创建新的对象时能够直接拿来用。因为内存没有被释放，因此创建起来就会快很多。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 再探浮点数的创建与销毁","id":"50","title":"再探浮点数的创建与销毁"},"51":{"body":"下面我们修改解释器源代码，当创建和销毁浮点数的时候，打印一些日志信息。 日志信息以字典的形式打印，里面有三个 key，含义如下： action：如果值为 \"from_freelist\"，表示从缓存池获取对象；如果值为 \"to_freelist\" 表示对象放入缓存池。 numfree：从缓存池获取对象、或将对象放入缓存池之后的元素个数。 address of object：创建或销毁的对象的地址。 当创建 f1 的时候，指向的浮点数会从缓存池中获取，日志信息中的对象地址显然和 Python 里打印的地址是一样的。然后 del f1，会将对象放入缓存池中。最后新建一个变量 f2，显然它指向的浮点数会复用 f1 指向的浮点数的内存。 再举个例子： 我们重新创建变量 f1、f2，并打印对象地址，然后删除 f1、f2 变量，之后再重新创建 f1、f2 变量并打印对象地址，结果发现地址在删除前后正好是相反的。至于原因，如果思考一下将对象放入缓存池、以及从缓存池获取对象时所采取的策略，那么很容易就明白了。 因为 del f1,f2 的时候会先删除 f1，再删除 f2。删除 f1 的时候，会将 f1 指向的对象作为链表中的头结点，然后删除 f2 的时候，会将 f2 指向的对象作为链表中新的头结点，所以之前 f1 指向的对象就变成了链表中的第二个节点。 浮点数缓存池在添加节点的时候，采用的是头插法。 而获取的时候，也会从链表的头部开始获取，所以当重新创建变量 f1 的时候，其指向的对象使用的是之前变量 f2 指向的对象所占的内存，而一旦获取，那么 free_list 指针会指向下一个节点。然后创建变量 f2 的时候，其指向的对象使用的就是之前变量 f1 指向的对象所占的内存。 因此前后打印的地址是相反的，所以我们算是通过实践从另一个角度印证了之前分析的结论。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 侵入 PyFloatObject","id":"51","title":"侵入 PyFloatObject"},"52":{"body":"有时我们想观察底层数据结构的表现行为时，不一定非要修改解释器，因为那样太麻烦，还要重新编译。Python 在上层提供了一种方式，可以让我们通过 Python 的类轻松地模拟 C 的结构体。 from ctypes import * class PyObject(Structure): \"\"\" 继承 ctypes.structure，便可以得到c的结构体 然后通过 fields 指定结构体字段 \"\"\" # _fields_ 是一个列表，内部的元组对应结构体的字段 _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] # ob_refcnt 是 Py_ssize_t 类型，等价于 c_ssize_t # 至于 ob_type，我们就指定 void *，因为暂时不用这个字段 class PyFloatObject(PyObject): \"\"\" 继承 Pyobject，相当于结构体的嵌套 \"\"\" _fields_ = [ (\"ob_fval\", c_double) ] e = 2.71\n# 创建 PyFloatObject 实例，返回它的指针\n# from_address 表示根据对象的地址创建\nf = PyFloatObject.from_address(id(e))\n# 此时 e 和 f 都指向了 2.71 这个浮点数 # 注意接下来会发生神奇的一幕\nprint(e) # 2.71\nprint(hex(id(e))) # 0x1f94d2382f0 # f 等价于底层的 PyFloatObject *，修改 ob_fval 字段\nf.ob_fval = 3.14\nprint(e) # 3.14\nprint(hex(id(e))) # 0x1f94d2382f0 我们看到 id(e) 在前后并没有发生改变，证明 e 指向的始终是同一个对象，但是它的值却变了。咦，不是说浮点数是不可变对象吗？如果想变的话只能创建一个新的浮点数，这样一来前后打印的地址应该会变才对啊。 首先说明结论是没错的，可这是从 Python 的角度而言。如果是从解释器的角度来看的话，没有什么可变不可变，只要我们想让它可变，那么它就是可变的。 另外为了更好地观察底层数据结构的表现，我们后面会经常使用这种方式，而且会介绍更多的骚操作，但是切记这种动态修改解释器的做法不可用于生产环境。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 通过 ctypes 模拟底层数据结构","id":"52","title":"通过 ctypes 模拟底层数据结构"},"53":{"body":"以上就是浮点数的缓存池机制，简单来说是一种空间换时间的做法。 为了避免频繁地和内核打交道，CPython 引入了内存池机制，事先会向操作系统申请一部分内存，然后根据大小划分成不同的单元，按需分配。这样就无需频繁和操作系统的内核打交道了，因为系统调用是代价昂贵的操作。 但有了内存池还不够，我们知道 Python 对象是分配在堆上的，而在堆上分配内存效率要比栈差很多。所以又引入了缓存池，对象在被销毁后不释放所占内存，而是通过一个链表串起来，留着下次备用。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 小结","id":"53","title":"小结"},"54":{"body":"本篇文章来聊一聊浮点数支持的操作，之前说过实例对象的相关操作都定义在类型对象里面，所以我们需要查看 PyFloat_Type。 // Objects/floatobject.c\nPyTypeObject PyFloat_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"float\", sizeof(PyFloatObject), // 浮点数的 __repr__ 方法 (reprfunc)float_repr, /* tp_repr */ // 浮点数作为数值对象拥有的算数操作 &float_as_number, /* tp_as_number */ // ... // 浮点数的哈希操作 (hashfunc)float_hash, /* tp_hash */ // ... // 浮点数支持的比较操作 float_richcompare, /* tp_richcompare */ // ...\n}; 还是之前说的，Python 底层的函数命名以及 API 都是很有规律的，举个例子： tp_repr 字段表示实例对象的字符串格式化，在 PyFloat_Type 里面它被赋值为 float_repr。 tp_hash 字段表示实例对象的哈希操作，在 PyFloat_Type 里面它被赋值为 float_hash。 tp_richcompare 字段表示实例对象的比较操作，所有的比较运算均由该字段负责实现，在 PyFloat_Type 里面它被赋值为 float_richcompare。 下面我们来通过源码看一下底层实现。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 楔子","id":"54","title":"楔子"},"55":{"body":"由于 PyFloat_Type 没有实现 tp_str（字段的值为 0 ），所以打印一个浮点数会执行 tp_repr，它对应的具体实现为 float_repr 函数。 // Objects/floatobject.c static PyObject *\nfloat_repr(PyFloatObject *v)\n{ PyObject *result; // 返回值 char *buf; // 将 Python 浮点数转成 C 的浮点数，然后再转成字符串 buf = PyOS_double_to_string(PyFloat_AS_DOUBLE(v), 'r', 0, Py_DTSF_ADD_DOT_0, NULL); if (!buf) return PyErr_NoMemory(); // 基于 C 字符串创建 Python 字符串 result = _PyUnicode_FromASCII(buf, strlen(buf)); // 释放 buf，然后返回 PyMem_Free(buf); return result;\n} 比较简单，当然具体的转换逻辑由 PyOS_double_to_string 函数负责，内部最终会调用 C 的库函数，感兴趣可以看一下。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的字符串打印","id":"55","title":"浮点数的字符串打印"},"56":{"body":"获取浮点数的哈希值会执行 tp_hash，它对应的具体实现为 float_hash。 // Objects/floatobject.c\nstatic Py_hash_t\nfloat_hash(PyFloatObject *v)\n{ return _Py_HashDouble(v->ob_fval);\n} 具体的哈希计算逻辑由 _Py_HashDouble 负责，通过 v->ob_fval 拿到 C 浮点数，然后传进去计算哈希值。 感兴趣可以看一下具体的哈希值计算逻辑，该函数位于 Python/pyhash.c 中。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的哈希值","id":"56","title":"浮点数的哈希值"},"57":{"body":"浮点数之间的比较操作由 tp_richcompare 字段负责实现，该字段的值为 float_richcompare。 // Include/object.h\n#define Py_LT 0 // 小于\n#define Py_LE 1 // 小于等于\n#define Py_EQ 2 // 等于\n#define Py_NE 3 // 不等于\n#define Py_GT 4 // 大于\n#define Py_GE 5 // 大于等于 // Objects/floatobject.c\nstatic PyObject*\nfloat_richcompare(PyObject *v, PyObject *w, int op)\n{ // 假设在 Python 里面执行了 3.14 == 2.71 // 那么这里的 v 和 w 就会指向 3.14 和 2.71，而 op 就是 Py_EQ double i, j; int r = 0; assert(PyFloat_Check(v)); // 通过 ((PyFloatObject *) v)->ob_fval 拿到具体的 C 浮点数 i = PyFloat_AS_DOUBLE(v); // 变量只是泛型指针 PyObject *，它究竟指向什么类型的对象是需要判断的 // 对于 v == w 来讲，如果能执行该函数，我们只能确保 v 一定指向浮点数，但 w 则不一定 // 所以需要判断，如果 w 的类型是 float 或者 float 的子类，那么转成 C double 并赋值给 j if (PyFloat_Check(w)) // 绝大部分情况都会触发此分支 j = PyFloat_AS_DOUBLE(w); else if (!Py_IS_FINITE(i)) { // ... } else if (PyLong_Check(w)) { // ... } else /* w isn't float or int */ goto Unimplemented; Compare: PyFPE_START_PROTECT(\"richcompare\", return NULL) // 拿到 i 和 j 之后，判断 op 是哪一种操作符，然后执行相应的比较逻辑 switch (op) { case Py_EQ: r = i == j; break; case Py_NE: r = i != j; break; case Py_LE: r = i <= j; break; case Py_GE: r = i >= j; break; case Py_LT: r = i < j; break; case Py_GT: r = i > j; break; } PyFPE_END_PROTECT(r) return PyBool_FromLong(r); Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 该函数的代码量还是有一些大的，但逻辑很好理解，主要是会对 w 做一些类型上的检测。因为 w 不一定是浮点数，比如 3.14 != [] 同样会触发该函数，但函数里的 w 指向的就不是浮点数，而是列表。 不过大部分情况下，两个对象比较的时候，如果符号左侧是浮点数，那么右侧基本也是浮点数。所以基本上都会走开始的 if 分支，然后进入比较逻辑。但如果符号右侧不是浮点数，那么会执行剩下的分支，逻辑会更复杂一些。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的比较操作","id":"57","title":"浮点数的比较操作"},"58":{"body":"最后是重头戏，来看看浮点数是如何运算的。由于加减乘除等算术操作很常见，所以解释器将其抽象成 PyNumberMethods 方法簇。对于数值型对象来说，它的类型对象会实现此方法簇，并由 tp_as_number 字段指向。 // Include/cpython/object.h\ntypedef struct { binaryfunc nb_add; binaryfunc nb_subtract; binaryfunc nb_multiply; binaryfunc nb_remainder; binaryfunc nb_divmod; ternaryfunc nb_power; unaryfunc nb_negative; unaryfunc nb_positive; unaryfunc nb_absolute; inquiry nb_bool; unaryfunc nb_invert; binaryfunc nb_lshift; binaryfunc nb_rshift; binaryfunc nb_and; binaryfunc nb_xor; binaryfunc nb_or; // ...\n} PyNumberMethods; PyNumberMethods 这个结构体在前面已经介绍过，每个字段都是一个函数指针，对应一个算术操作。而根据参数个数的不同，这些函数可以分为多种。 unaryfunc： 一元函数，只接收一个参数，返回 PyObject *； binaryfunc： 二元函数，接收两个参数，返回 PyObject *； ternaryfunc： 三元函数，接收三个参数，返回 PyObject *； inquiry：一元函数，接收一个参数，但返回的是 int。 它们本质上就是解释器基于参数的类型和个数而起的别名，除了以上这些，还有很多其它的别名，具体可以查看 Include/object.h。 由于浮点数是数值型对象，所以 PyFloat_Type 实现了该方法簇，值为 float_as_number，来看一下，它位于 Objects/floatobject.c 中。 像 float_add 负责浮点数的加法运算，float_sub 负责浮点数的减法运算，都比较简单。但我们看到有的函数指针被赋值成了 0，如果为 0 则表示不支持相应操作，比如浮点数不支持位运算。 在 C 语言中，给指针类型的字段赋值为 0 和赋值为 NULL 是等价的。 好，下面我们以加法运算为例，看一下具体实现。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ // 显然两个 Python 浮点数相加，一定是先转成 C 的浮点数，然后再相加 // 加完之后再根据结果创建新的 Python 浮点数 double a,b; // 声明两个 double 变量 // CONVERT_TO_DOUBLE 是一个宏，从名字上也能看出来它的作用 // 将 PyFloatObject 里面的 ob_fval 抽出来，赋值给 double 变量 CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) // 将 a 和 b 相加，然后再重新赋值给 a a = a + b; PyFPE_END_PROTECT(a) // 根据相加后的结果创建新的 PyFloatObject 对象 // 并将其指针转成 PyObject * 之后返回 return PyFloat_FromDouble(a);\n} 以上就是浮点数的加法运算，核心如下： 定义两个 double 变量 a 和 b。 将相加的两个 Python 浮点数维护的值（ob_fval）抽出来，交给 a 和 b。 让 a 和 b 相加，将相加的结果传入 PyFloat_FromDouble 函数中创建新的 PyFloatObject，然后返回其 PyObject *。 另外 float_add 里面还有两个宏我们没有说，分别是：PyFPE_START_PROTECT 和 PyFPE_END_PROTECT，它们是做什么的呢？首先浮点数计算一般都遵循 IEEE-754 标准，如果计算时出现了错误，那么需要将 IEEE-754 异常转换成 Python 异常，而这两个宏就是用来干这件事情的。 所以我们不需要管它，这两个宏定义在 Include/pyfpe.h 中，并且已经在 Python3.9 的时候被移除了。 以上便是浮点数的加法运算，所谓的浮点数在底层就是一个 PyFloatObject 结构体实例。而结构体实例无法直接相加，所以必须先将结构体中维护的值抽出来，对于浮点数而言就是 ob_fval，然后转成 C 的 double 再进行相加。最后根据相加的结果创建新的结构体实例，于是新的 Python 对象便诞生了。 假设 a, b = 1.1, 2.2，那么 c = a + b 的流程如下所示： 但如果是 C 的两个浮点数相加，那么编译之后就是一条简单的机器指令，然而 Python 则需要额外做很多其它工作。并且后续在介绍整数的时候，你会发现 Python 的整数相加更麻烦，但对于 C 而言同样是一条简单的机器码就可以搞定。 所以为什么 Python 会比 C 慢很多倍，从一个简单的加法上面就可以看出来。 以上是浮点数的加法操作，至于减法、乘法、除法等操作也是类似的。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) a = a + b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_sub(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"subtract\", return 0) a = a - b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_mul(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"multiply\", return 0) a = a * b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_div(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); if (b == 0.0) { PyErr_SetString(PyExc_ZeroDivisionError, \"float division by zero\"); return NULL; } PyFPE_START_PROTECT(\"divide\", return 0) a = a / b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} 代码逻辑是类似的，整个过程就是将 Python 浮点数里面的值抽出来，得到 C 浮点数，然后进行运算，再基于运算的结果创建 Python 浮点数，并返回它的泛型指针。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的算数操作","id":"58","title":"浮点数的算数操作"},"59":{"body":"到此浮点数就介绍完了，之所以先介绍浮点数，是因为浮点数最简单。至于整数，其实并没有那么简单，因为它的值在底层是通过数组存储的。而浮点数的值则是用一个 double 类型的字段来维护，会更简单一些，所以我们就先拿浮点数开刀了。 首先我们介绍了浮点数的创建和销毁，创建有两种方式，分别是使用对象的特定类型API 和调用类型对象。前者速度更快，但只适用于内置数据结构，而后者更加通用。 销毁的时候则调用类型对象内部的 tp_dealloc 字段指向的 float_dealloc 函数。当然为了保证效率，避免内存的频繁创建和回收，解释器为浮点数引入了缓存池机制，我们也分析了背后的原理。 最后浮点数还支持数值运算，PyFloat_Type 的 tp_as_number 字段指向了 PyNumberMethods 结构体实例 float_as_number，里面有大量的函数指针，每个指针指向了具体的函数，专门用于浮点数的运算。至于运算的具体逻辑，我们也以加法为例详细介绍了 float_add 函数的实现。核心就是将 Python 对象内部的值抽出来，转成 C 的类型，然后运算，最后再根据运算的结果创建 Python 对象，并返回泛型指针。 关于浮点数，如果你还想知道它的更多内容，可以进入源码中，大肆探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 小结","id":"59","title":"小结"},"6":{"body":"再来看看变量之间的传递，在 Python 中是如何体现的。 a = 666\nprint(hex(id(a))) # 0x1f4e8ca7fb0 b = a\nprint(hex(id(b))) # 0x1f4e8ca7fb0 我们看到打印的地址是一样的，再用一张图解释一下。 a = 666 的时候，先开辟一份内存，再让 a 存储对应内存的地址；然后 b = a 的时候，会把 a 拷贝一份给 b，所以 b 和 a 存储了相同的地址，它们都指向了同一个对象。 因此说 Python 是值传递、或者引用传递都是不准确的，准确的说 Python 是变量的值传递，对象的引用传递。因为 Python 的变量可以认为是 C 的一个指针，在 b = a 的时候，等于把 a 指向的对象的地址（a 本身）拷贝一份给 b，所以对于变量来说是值传递；然后 a 和 b 又都是指向对象的指针，因此对于对象来说是引用传递。 在这个过程中，对象没有重复创建，它只是多了一个引用。 另外还有最关键的一点，Python 的变量是一个指针，当传递变量的时候，传递的是指针；但是在操作变量的时候，会操作变量指向的内存。所以 id(a) 获取的不是 a 的地址，而是 a 指向的内存的地址（在底层其实就是 a 本身）；同理 b = a，是将 a 本身，或者说将 a 存储的、指向某个具体的对象的地址传递给了 b。 另外在 C 的层面，显然 a 和 b 属于指针变量，那么 a 和 b 有没有地址呢？显然是有的，只不过在 Python 中是获取不到的，解释器只允许获取对象的地址。 我们再举个函数的例子： def some_func(num): print(\"address of local num\", hex(id(num))) num = 667 print(\"address of local num\", hex(id(num))) num = 666\nprint(\"address of global num\", hex(id(num)))\nsome_func(num)\n\"\"\"\naddress of global num 0x2356cd698d0\naddress of local num 0x2356cd698d0\naddress of local num 0x2356c457f90\n\"\"\" 函数的参数也是一个变量，所以 some_func(num) 其实就是把全局变量 num 存储的对象的地址拷贝一份给局部变量 num，所以两个 num 指向了同一个对象，打印的地址相同。然后函数内部又执行了 num = 667，相当于让局部变量指向新的对象，或者说保存新对象的地址，因此打印的结果发生变化。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 值传递？引用传递？","id":"6","title":"值传递？引用传递？"},"60":{"body":"本篇文章来聊一聊复数，尽管在日常开发中基本用不到复数，但对它有一个深刻的认识，知道它是做什么的，个人觉得还是很有必要的。另外，本系列力求精致、详细，因此每一个细节都要到位。 那么下面就来解释一下什么是复数。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 楔子","id":"60","title":"楔子"},"61":{"body":"复数是一种用来扩展实数的数，它由实数和虚数两部分组成，用来解决实数范围内无法解决的问题，基本形式如下。 形如 a + bi 的数，我们称之为复数，其中 a 和 b 是浮点数（实数），i 是虚数，满足 i 的平方等于 -1。 所以复数不仅包含实数，还包含虚数，形式为 a + bi，然后 a 被称为复数的实部，b 被称为复数的虚部。如果两个复数的实部相同，虚部相反，那么它们互为共轭复数，比如 1 + 3i 和 1-3i。 如果对复数的实部和虚部进行平方和再开根号，便可得到复数的模，比如 3 + 4i 的模便是 5。 复数的引入可以帮助我们更好地理解和解决许多数学以及物理问题，特别是在涉及振动、波动和电路分析等领域，比如： 电工程：分析交流电路和信号处理； 控制系统：用于系统稳定性分析； 量子力学：描述波函数和量子态； 流体力学：用于描述流动问题； 当然复数也有自己的运算规则。 加法：两个复数相加等于对应的实部和虚部分别相加 减法：两个复数相减等于对应的实部和虚部分别相减 乘法：两个复数的乘法使用分配率 除法：两个复数的乘法涉及到共轭复数 以上就是复数的基本概念，下面来看看 Python 的复数是怎么实现的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 什么是复数","id":"61","title":"什么是复数"},"62":{"body":"复数的实现比想象中要简单很多，说白了就是维护两个浮点数而已。 // Include/complexobject.h\ntypedef struct { double real; double imag;\n} Py_complex; typedef struct { PyObject_HEAD Py_complex cval;\n} PyComplexObject; 我们看到复数的结构和浮点数是非常相似的，只不过浮点数只用一个 double 来维护具体的值。而复数因为存在实部和虚部，因此需要两个 double，其中 real 维护复数的实部，imag 维护复数的虚部。 # 在别的语言中，虚数都是用 i 来表示\n# 而 Python 觉得 i 是一个很常用的变量，所以使用 j 来表示虚数\ncpx = 3 + 4j\n# 其中 3 为实部，4 为虚部\nprint(cpx) # (3+4j)\n# 如果虚部为 1，那么要写成 1j，不能只写 j，否则解释器会认为 j 是一个变量\nprint(3 + 1j) # (3+1j)\n# 复数的实部可以为 0\nprint(2j) # 2j\n# 当然虚部也可以为 0，如果虚部为 0，那么要写成 0j，不能不写\n# 因为 3 和 3+0j 不是等价的，前者是整数，后者是复数\nprint(0j) # 0j\nprint(3 + 0j) # (3+0j) 整个过程非常简单，当解释器看到 3 + 4j 的时候，就知道要创建复数了，因为解释器对内置的数据结构了如指掌，所以在底层会创建一个 PyComplexObject 结构体实例。 没有什么难度，和浮点数是类似的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的底层结构","id":"62","title":"复数的底层结构"},"63":{"body":"类型对象定义的操作，决定了实例对象的行为，所以我们需要查看复数的类型都定义了哪些操作。复数的类型在 Python 里面对应 <class 'complex'>，那么根据解释器的命名规则，它在底层应该由 PyComplex_Type 负责实现。 // Objects/complexobject.c\nPyTypeObject PyComplex_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"complex\", sizeof(PyComplexObject), // ... &complex_as_number, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ // ... complex_richcompare, /* tp_richcompare */ // ... complex_methods, /* tp_methods */ complex_members, /* tp_members */ // ...\n}; complex 的类型也是 type，它的实例对象的大小就是 PyComplexObject 结构体的大小。然后我们看下它的 tp_members，该字段表示实例对象有哪些属性，它被赋值为 complex_members。 它有两个属性，分别是 real 和 imag，类型为 double，并且是只读的。那么在 Python 里面创建复数之后，便可以获取 real 和 imag 属性。 cpx = 3 + 4j\n# 注意：虽然写的是 3 + 4j，但实部和虚部都是浮点数\nprint(cpx.real) # 3.0\nprint(cpx.imag) # 4.0 然后 complex 类型还实现了 tp_richcompare，用于复数之间的比较，但对于复数来说，比较操作只支持等于和不等于。 // Objects/complexobject.c\nstatic PyObject *\ncomplex_richcompare(PyObject *v, PyObject *w, int op)\n{ PyObject *res; // 比较结果 Py_complex i; // 复数的实部和虚部组成的结构体 int equal; // 两个复数是否相等 // 如果 op 不是 ==、也不是 !=，那么报错 // 因为复数只支持这两种比较操作 if (op != Py_EQ && op != Py_NE) { goto Unimplemented; } assert(PyComplex_Check(v)); // 获取复数 v 的 cval 字段，并赋值给 i // 即 i = ((PyComplexObject *) v)->cval TO_COMPLEX(v, i); if (PyLong_Check(w)) { // ... } else if (PyFloat_Check(w)) { // ... } else if (PyComplex_Check(w)) { Py_complex j; // j = ((PyComplexObject *) w)->cval TO_COMPLEX(w, j); // 如果实部和虚部都相等，那么两个复数相等 equal = (i.real == j.real && i.imag == j.imag); } else { goto Unimplemented; } // equal 为 1，表示两个复数相等，为 0 表示两个复数不相等 // 如果 op 为 Py_EQ，那么相等返回 True，不等返回 False // 如果 op 为 Py_NE，那么相等返回 False，不等返回 True if (equal == (op == Py_EQ)) res = Py_True; else res = Py_False; Py_INCREF(res); return res; Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 以上就是复效的比较，核心就是比较对应的实部和虚部是否均相等。 由于复数也属于数值型对象，所以它也实现了 tp_as_number 方法簇。 我们以复数的加法和减法为例，看一下源码细节。 // Objects/complexobject.c // 负责将两个 Py_complex 结构体实例相加\nPy_complex\n_Py_c_sum(Py_complex a, Py_complex b)\n{ // 复数的值由 Py_complex 结构体维护，它里面有 real 和 imag 两个字段 Py_complex r; // 两个 Py_complex 实例相加的时候，等于内部的 real 和 imag 字段分别相加 r.real = a.real + b.real; r.imag = a.imag + b.imag; return r;\n} // 负责将两个 Py_complex 结构体实例相减\nPy_complex\n_Py_c_diff(Py_complex a, Py_complex b)\n{ Py_complex r; r.real = a.real - b.real; r.imag = a.imag - b.imag; return r;\n} // 基于 Py_complex 创建 PyComplexObject\nPyObject *\nPyComplex_FromCComplex(Py_complex cval)\n{ PyComplexObject *op; // 为 PyComplexObject 结构体实例申请内存 // 我们看到内存大小可以直接计算出来，因为内置数据结构在底层是写死的 // 解释器对它们了如指掌，直接通过 sizeof 算一下即可，不需要借助类型对象 op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject)); // 如果 op 为 NULL，表示内存不够，申请失败 if (op == NULL) return PyErr_NoMemory(); // 初始化引用计数，并将 op->ob_type 初始化为 &PyComplex_Type // 也就是让实例对象和类型对象建立联系 (void)PyObject_INIT(op, &PyComplex_Type); // 最后初始化 cval 字段，它是 Py_complex 结构体实例，负责维护复数具体的值 op->cval = cval; // 转成泛型指针 PyObject * 之后返回 return (PyObject *) op;\n} // 复数的加法\nstatic PyObject *\ncomplex_add(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_add\", return 0) // 调用 _Py_c_sum 进行相加，得到新的 Py_complex result = _Py_c_sum(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} // 复数的减法\nstatic PyObject *\ncomplex_sub(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_sub\", return 0) // 调用 _Py_c_diff 进行相减，得到新的 Py_complex result = _Py_c_diff(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} 以上就是复数的加法和减法，比较简单，至于其它操作，感兴趣可以自己阅读一下源码。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的行为","id":"63","title":"复数的行为"},"64":{"body":"本次我们就介绍了复数的底层结构以及它的一些相关操作，总的来说和浮点数是比较像的。不过还是像上面说的那样，对于我们日常开发来说，复数用的并不多，甚至可以说是几乎不用，但通过它来加深对源码的理解以及感受 Python 对象的设计哲学，还是非常有意义的。 下一篇文章来说一说整数，我们知道 Python 整数不会溢出，那么它是怎么设计的呢？背后有什么黑科技呢？我们下一篇文章再聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 小结","id":"64","title":"小结"},"65":{"body":"本篇文章来分析一下 Python 整数的实现原理，我们知道 Python 整数是不会溢出的，换句话说它可以计算无穷大的数。只要你的内存足够，它就能计算，但对于 C 来说显然是不行的，C 能保存的整数范围是有限的。 但问题是，Python 的底层是 C 实现的，那么它是怎么做到整数不溢出的呢？想要知道答案，那么看一下整数在底层是怎么定义的就行了。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 楔子","id":"65","title":"楔子"},"66":{"body":"Python 整数在底层由 PyLongObject 结构体负责承载，看一下它的定义。 // Include/longobject.h\ntypedef struct _longobject PyLongObject; // Include/longintrepr.h\nstruct _longobject { PyObject_VAR_HEAD digit ob_digit[1];\n}; 里面每个字段的含义如下： ob_refcnt：对象的引用计数； ob_type：对象的类型； ob_size：数组 ob_digit 的长度； ob_digit：digit 类型的数组； 别的先不说，就冲里面的 ob_size 我们就可以思考一番。首先 Python 的整数有大小、但应该没有长度的概念吧，那为什么会有一个 ob_size 呢？从结构体字段来看，这个 ob_size 表示数组 ob_digit 的长度，而这个 ob_digit 显然是用来维护具体的值。 相信你已经猜到 Python 整数不会溢出的秘密了，因为它内部通过数组来存储整数，所以能存储无限大的数。因此答案出来了，虽然整数没有我们生活中的那种长度的概念，但它是个变长对象，因为不同的整数占用的内存可能是不一样的。尽管它没有字符串、列表那种长度的概念，或者说无法对整数使用 len 函数，但它是个变长对象。 接下来的重点就是这个 ob_digit 数组，我们要从它的身上挖掘信息，看看整数是怎么放在里面的，不过首先我们要搞清楚这个 digit 是什么类型。 // Include/longintrepr.h\n#if PYLONG_BITS_IN_DIGIT == 30 typedef uint32_t digit;\n#elif PYLONG_BITS_IN_DIGIT == 15 typedef unsigned short digit;\n#else #error \"PYLONG_BITS_IN_DIGIT should be 15 or 30\" PYLONG_BITS_IN_DIGIT 是一个宏，这个宏是做什么的我们先不管，总之如果机器是 64 位的，那么它会被定义为 30，机器是 32 位的，则会被定义为 15。而现在的机器基本都是 64 位的，所以 PYLONG_BITS_IN_DIGIT 等于 30，因此 digit 等价于 uint32_t，即 unsigned int。 因此 ob_digit 是一个无符号 32 位整型数组，至于长度，虽然声明为 1，但其实没有限制，你可以当成任意长度的数组来用，这是 C 语言的一个常见特性。和 Go 不同，C 数组的长度不属于类型信息。至于数组具体多长，取决于存储的整数有多大，显然整数越大，这个数组就越长，占用的空间也就越大。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数的底层结构","id":"66","title":"整数的底层结构"},"67":{"body":"了解了 ob_digit 数组之后，来分析一下它是怎么存储整数的？ 首先抛出一个问题，如果你是 Python 的设计者，要保证整数不会溢出，你会怎么办？我们不妨再把问题简化一下，假设有一个 8 位无符号整数类型，我们知道它能表示的最大数字是 255，但这时候如果要表示 256，该怎么办呢？ 可能有人会想，那用两个数来存储不就好了，一个存储 255，一个存储 1，然后将这两个数放在数组里面。这个答案虽然有些接近，但其实还有偏差：就是我们并不能简单地按照大小拆分，比如 256 拆分成 255 和 1，要是 265 就拆分成 255 和 10，不能这样拆分，而是要通过二进制的方式，也就是用新的整数来模拟更高的位。 如果感到困惑的话没有关系，我们以 Python 整数的底层存储为例，来详细解释一下这个过程。解释器实现整数也是通过我们上面说的这种方式，但考虑的会更加全面一些。 整数 0 注意：当表示的整数为 0 时，ob_digit 数组为空，不存储任何值。而 ob_size 为 0，表示这个整数的值为 0，这是一种特殊情况。 整数 1 整数 -1 我们看到 ob_digit 数组没有变化，但是 ob_size 变成了 -1。没错，整数的正负是通过 ob_size 决定的，ob_digit 存储的其实是绝对值。无论整数 n 是多少，-n 和 n 对应的 ob_digit 是完全一致的，但是 ob_size 则互为相反数。所以 ob_size 除了表示数组的长度之外，还可以表示对应整数的正负。 因此我们之前说整数越大，底层的 ob_digit 数组就越长。更准确地说是绝对值越大，底层数组就越长。所以 Python 在比较两个整数的大小时，会先比较 ob_size，如果 ob_size 不一样则可以直接比较出大小。显然 ob_size 越大，对应的整数越大，不管 ob_size 是正是负，都符合这个结论。 整数 2 ** 30 - 1 如果想表示 2 ** 30 - 1，那么也可以使用一个 digit 表示。话虽如此，但为什么突然说这个数字呢？答案是：虽然 digit 是 4 字节、32 位，但解释器只用 30 个位。 之所以这么做是和加法进位有关系，如果 32 个位全部用来存储其绝对值，那么相加产生进位的时候，可能会溢出。比如 2 ** 32 - 1，此时 32 个位全部占满了，即便它只加上 1，也会溢出。那么为了解决这个问题，就需要先强制转换为 64 位整数再进行运算，从而会影响效率。但如果只用 30 个位的话，那么加法是不会溢出的。 因为 30 个位最大就是 2 ** 30 - 1，即便两个这样的数相加，结果也是 2 ** 31 - 2。而 32 个位最大能表示 2 ** 32 - 1，所以肯定不会溢出的。如果一开始 30 个位就存不下，那么数组中会有两个 digit。 所以虽然将 32 位全部用完，可以只用一个 digit 表示更大的整数，但会面临相加之后一个 digit 存不下的情况，于是只用 30 个位。如果数值大到 30 个位存不下的话，那么就会多使用一个 digit。 这里可能有人发现了，如果使用 31 个位的话，那么相加产生的最大值就是 2 ** 32 - 2，依旧可以使用一个 32 位整型存储啊，那 Python 为啥要牺牲两个位呢？答案是为了乘法运算。 为了方便计算乘法，需要多保留 1 位用于计算溢出。这样当两个整数相乘的时候，可以直接按 digit 计算，并且由于兼顾了\"溢出位\"，可以把结果直接保存在一个寄存器中，以获得最佳性能。 具体细节就不探究了，只需要知道整数在底层是使用 unsigned int 类型的数组来维护具体的值即可，并且虽然该类型的整数有 32 个位，但解释器只用 30 个位。 然后还记得我们在看 digit 类型的时候，说过一个宏吗？PYLONG_BITS_IN_DIGIT，在 64 位机器上等于 30，在 32 位机器上等于 15。相信这个宏表示的是啥你已经清楚了，它代表的就是使用的 digit 的位数。 整数 2 ** 30 问题来了，我们说 digit 只用 30 个位，所以 2 ** 30 - 1 是一个 digit 能存储的最大值。而现在是 2 ** 30，所以数组中就要有两个 digit 了。 我们看到此时就用两个 digit 来存储了，然后数组里面的元素是 0 和 1，而且充当高位的放在后面，因为是使用新的 digit 来模拟更高的位。由于一个 digit 只用 30 位，那么数组中第一个 digit 的最低位就是 1，第二个 digit 的最低位就是 31，第三个 digit 的最低位就是 61，以此类推。 所以如果 ob_digit 为 [a, b, c]，那么对应的整数就等于： 如果 ob_digit 不止 3 个，那么就按照 30 个位往上加，比如 ob_digit 还有第四个元素 d，那么就再加上 d * 2 ** 90 即可。 以上就是 Python 整数的存储奥秘，说白了就是串联多个小整数来表达大整数。并且这些小整数之间的串联方式并不是简单的相加，而是将各自的位组合起来，共同形成一个具有更高位的大整数，比如将两个 32 位整数串联起来，表示 64 位整数。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 探究整数的秘密","id":"67","title":"探究整数的秘密"},"68":{"body":"下面我们再分析一下，一个整数要占用多大的内存。 相信所有人都知道可以使用 sys.getsizeof 计算内存大小，但是这大小到底是怎么来的，估计会一头雾水。因为 Python 中对象的大小，是根据底层的结构体计算出来的。 由于 ob_refcnt、ob_type、ob_size 这三个是整数所必备的，它们都是 8 字节，加起来 24 字节，所以任何一个整数所占内存都至少 24 字节。至于具体占多少，则取决于 ob_digit 里面的元素有多少个。 因此整数所占内存等于 24 + 4 * ob_size的绝对值。 import sys # 如果是 0 的话，ob_digit 数组为空，所以大小就是 24 字节\nprint(sys.getsizeof(0)) # 24 # 如果是 1 的话，ob_digit 数组有一个元素，所以大小是 24 + 4 = 28 字节\nprint(sys.getsizeof(1)) # 28\n# 同理\nprint(sys.getsizeof(2 ** 30 - 1)) # 28 # 一个 digit 只用 30 位，所以最大能表示 2 ** 30 - 1\n# 如果是 2 ** 30，那么就需要两个元素，所以大小是 24 + 4 * 2 = 32 字节\nprint(sys.getsizeof(2 ** 30)) # 32\nprint(sys.getsizeof(2 ** 60 - 1)) # 32 # 如果是两个 digit，那么能表示的最大整数就是 2 ** 60 - 1\n# 因此 2 ** 60 需要三个 digit，所以大小是 24 + 4 * 3 = 36 字节\nprint(sys.getsizeof(1 << 60)) # 36\nprint(sys.getsizeof((1 << 90) - 1)) # 36 print(sys.getsizeof(1 << 90)) # 40 所以整数的大小就是这么计算的，当然不光整数，其它的对象也是如此，计算的都是底层结构体的大小。 另外我们也可以反推一下，如果有一个整数 88888888888，那么它对应的底层数组 ob_digit 有几个元素呢？每个元素的值又是多少呢？下面来分析一波。 import numpy as np # 假设占了 n 个位\n# 由于 n 个位能表达的最大整数是 2 ** n - 1\na = 88888888888\n# 所以只需获取以 2 为底、a + 1 的对数，即可算出 n 的大小\nprint(np.log2(a + 1)) # 36.371284042320475 计算结果表明，如果想要存下这个整数，那么至少需要 37 个位。而 1 个 digit 用 30 个位，很明显需要两个 digit。 # 如果 ob_digit 有两个元素\n# 那么对应的整数就等于 ob_digit[0] + ob_digit[1] * 2 ** 30\na = 88888888888\nprint(a // 2 ** 30) # 82\nprint(a - 82 * 2 ** 30) # 842059320 所以整数 88888888888 在底层对应的 ob_digit 数组为 [842059320, 82]，下面修改解释器，来验证这一结论。 我们看到结果和我们分析的是一样的，但这种办法有点麻烦，我们可以通过之前说的 ctypes 来构造底层的结构体，在 Python 的层面模拟 C 的行为。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 2) ] a = 88888888888\n# 基于对象的地址构造 PyLongObject 对象\nlong_obj = PyLongObject.from_address(id(a))\n# 打印结果和我们预期的一样\nprint(long_obj.ob_digit[0]) # 842059320\nprint(long_obj.ob_digit[1]) # 82 # 如果将 ob_digit[1] 改成 28，那么 a 会变成多少呢？\n# 很简单，算一下就知道了\nlong_obj.ob_digit[1] = 28\nprint(842059320 + 28 * 2 ** 30) # 30906830392\n# 那么 a 会不会也打印这个结果呢？毫无疑问，肯定会的\nprint(a) # 30906830392 # 并且前后 a 保存的地址没有发生改变，因为我们修改的是底层数组\n# 因此所谓的可变和不可变，都只是根据 Python 的表现抽象出来的\n# 或者说，对象是否可变，取决于解释器有没有将修改对象的接口暴露出来\n# 要是解释器没有提供修改对象的接口，那么对象就是不可变的\n# 但如果站在解释器的层面上看，则没啥可变或不可变，一切都由我们决定 通过打印 ob_digit 存储的值，我们验证了得出的结论，原来 Python 是通过数组来存储整数，并且数组的类型虽然是无符号 32 位整数，但是只用 30 个位。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数占的内存大小是怎么计算的","id":"68","title":"整数占的内存大小是怎么计算的"},"69":{"body":"以上我们就探究了 Python 整数的秘密，它是怎么实现的。不过还没有结束，后续还要继续分析小整数对象池，以及整数的行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 小结","id":"69","title":"小结"},"7":{"body":"当提到类型时，这个类型指的是变量的类型还是对象的类型呢？不用想，肯定是对象的类型。因为 Python 的变量是个指针，操作指针会自动操作它指向的内存，所以使用 type(a) 查看的其实是变量 a 指向的对象的类型。 那么问题来了，我们在创建变量的时候，并没有显式地指定类型啊，那么解释器是如何判断一个变量指向什么类型的数据呢？答案是：解释器是通过靠猜的方式，通过赋的值（或者说变量引用的值）来推断类型。 因此在 Python 中，如果你想创建一个变量，那么必须在创建变量的时候同时赋值，否则解释器就不知道这个变量指向的数据是什么类型。所以 Python 是先创建相应的值，这个值在 C 中对应一个结构体，结构体里面有一个字段专门用来记录该值对应的类型，因此在 Python 中，类型是和对象绑定的，而不是和变量。当创建完值之后，再让这个变量指向它，所以 Python 中是先有值后有变量。 但在 C 里面显然不是这样的，因为 C 的变量代表的内存所存储的就是具体的值，所以在 C 里面可以直接声明一个变量的同时不赋值。因为 C 要求声明变量时必须指定类型，所以变量声明之后，其类型和内存大小就已经固定了。 而 Python 的变量存的是个地址，它只是指向了某个对象，所以由于其便利贴的特性，可以贴在任意对象上面。但是不管贴在哪个对象，都必须先有对象才可以，不然变量贴谁去。 另外，尽管 Python 在创建变量的时候不需要指定类型，但 Python 是强类型语言，而且是动态强类型。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量有类型吗？","id":"7","title":"变量有类型吗？"},"70":{"body":"之前分析过浮点数的创建，而整数的创建与之是类似的，都是基于字面量形式的 C 数据创建 Python 数据。 创建浮点数可以使用 PyFloat_FromDouble、PyFloat_FromString 等； 创建整数可以使用 PyLong_FromLong、PyLong_FromDouble、PyLong_FromString 等； 创建整数的这些函数直接去 Objects/longobject.c 里面查看即可，这里就不多说了，我们重点来看一下小整数对象池。 我们知道整数属于不可变对象，运算之后会创建新的对象。 >>> a = 666\n>>> id(a)\n140078521506224\n>>> a += 1\n>>> id(a)\n140078521506096\n>>> 显然这种做法一定存在性能缺陷，因为程序运行时会有大量的对象创建和销毁。根据浮点数的经验，我们猜测 Python 应该也对整数使用了缓存池吧。答案是差不多，只不过不是缓存池，而是小整数对象池。 一些使用频率高的整数在创建之后，会被保存在一个静态数组里面，我们称之为小整数对象池。 看一下小整数对象池的实现。 // Objects/longobject.c #define NSMALLPOSINTS 257\n#define NSMALLNEGINTS 5 static PyLongObject small_ints[NSMALLNEGINTS + NSMALLPOSINTS]; 数组 small_ints 便是小整数对象池，它是一个类型为 PyLongObject、长度为 262 的数组，里面缓存了 -5 到 256 之间的整数。当然这只是解释器的默认行为，因为 -5 到 256 之间的整数使用频率最高，但你也可以根据自身情况修改源码，让它缓存更多的整数，以提升效率，当然这也会额外占用一些内存。 小整数对象池是预先创建好的，里面的整数全局唯一，我们来验证一下。 >>> n1 = 256\n>>> n2 = 256\n>>> id(n1), id(n2)\n(140078528922016, 140078528922016)\n>>> >>> n1 = 257\n>>> n2 = 257\n>>> id(n1), id(n2)\n(140078521507472, 140078521506704)\n>>> 256 位于小整数对象池内，所以全局唯一，需要使用的话直接去取即可，因此它们的地址是一样的。但 257 不在小整数对象池内，所以它们的地址不一样。 另外上面的代码是交互式执行的，但如果有小伙伴不是通过交互式，那么打印地址的时候会得到出乎意料的结果。 a = 257\nb = 257\nprint(id(a) == id(b)) # True 可能有人会好奇，为什么地址又是一样的了，257 明明不在小整数对象池中啊。虽然涉及到了后面的内容，但提前解释一下也是可以的。主要区别就在于一个是交互式执行的，另一个是通过 python3 xxx.py 的方式执行的。 首先 Python 的编译单元是函数，每个函数都有自己的作用域，在这个作用域中出现的所有常量都是唯一的，并且都位于常量池中，由 co_consts 指向。虽然上面的对象不在函数中，而是在全局作用域中，但全局也可以看成是一个函数，它也是一个独立的编译单元。同一个编译单元中，相同的常量只会出现一次。 当执行 a = 257 的时候，会创建 257 这个整数，并放入常量池中。所以 b = 257 的时候就不会再创建了，因为常量池中已经有了，所以会直接从常量池中获取，因此它们的地址是一样的，因为是同一个 PyLongObject。 而对于交互式环境来说，因为输入一行代码就会立即执行一行，所以任何一行可独立执行的代码都是一个独立的编译单元。注意：是可独立执行的代码，比如变量赋值、函数、方法调用等等。但如果是 if、for、while、def 等需要多行表示的逻辑，比如 if 2 > 1:，显然就不是一行可独立执行的代码，它还依赖你输入的下面的内容。 # 此时按下回车，我们看到不再是 >>>，而是 ...\n# 这代表还没有结束，还需要你输入下面的内容\n>>> if 2 > 1:\n... print(\"2 > 1\")\n... # 此时这个 if 语句整体才是一个独立的编译单元\n2 > 1\n>>> 但是像 a = 1、foo()、lst.appned(123) 这些显然是一行可独立执行的代码，因此在交互式中它们是独立的编译单元。 # 此时这行代码已经执行了，它是一个独立的编译单元\n>>> a = 257\n# 这行代码也是独立的编译单元，所以它里面的常量池为空，因此要重新创建 257\n>>> b = 257\n# 由于它们是不同常量池内的整数，所以 id 是不一样的\n>>> id(a), id(b)\n(140078521506768, 140078521506096) 再来看个例子。 >>> a = 666; b = 666\n>>> id(a), id(b)\n(140078521506512, 140078521506512)\n>>>\n>>> a, b = 777, 777\n>>> id(a), id(b)\n(140078521506224, 140078521506224) 666 和 777 明显不在常量池中，为啥 a 和 b 指向对象的地址是一样的呢？相信你能猜到原因，因为上面两种方式无论哪一种，都是在同一行，因此整体会作为一个编译单元。既然是同一个编译单元，那么常量池里面的每个常量只会创建一次，所以地址是一样的。 注意：常量池里面的常量一定在编译期间就可以确定，比如整数、浮点数、字符串等等，解释器在编译期间会静态收集起来，保存在常量池中。但如果编译期间无法确定，就不会静态收集了，举个例子。 >>> a, b = int(\"257\"), int(\"257\")\n>>> id(a), id(b)\n(140078521506768, 140078521506512)\n>>> >>> a, b = int(\"123\"), int(\"123\")\n>>> id(a), id(b)\n(140078528917760, 140078528917760)\n>>> >>> a, b = 258, 258\n>>> id(a), id(b)\n(140078521507632, 140078521507632) int(\"257\") 需要在运行时执行，因此会创建两个 257，然后赋值给 a 和 b，所以地址不一样。 int(\"123\") 虽然也在运行时执行，但解释器创建完之后发现 123 位于小整数对象池中，于是会直接从池子里面取，所以打印的地址一样。注意：int(\"123\") 肯定是会执行的，只是执行之后发现结果存在于小整数对象池中，会再将创建的对象销毁。 258 属于编译期间可以静态收集的常量，会被保存在常量池中，而常量池里的常量只会出现一次，所以打印的地址一样。 ⭐️：常量不仅仅是 123、\"hello\" 这种，像 2 ** 10、\"AAA\" + \"BBB\" 这种也属于常量，它们在编译之后会被替换为 1024、\"AAABBB\"，这个过程被称为常量折叠。 以上就是小整数对象池相关的内容，比较简单，因为小整数对象池就是一个数组，里面缓存了 -5 到 256 之间的 Python 整数，而这些整数可以直接拿来用。 下一篇文章我们来分析整数的运算，这也是最关键的地方。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"17. 解密 Python 的小整数对象池","id":"70","title":"17. 解密 Python 的小整数对象池"},"71":{"body":"通过考察整数的底层实现，我们明白了它能够保证不溢出的缘由。整数的值在底层是由 C 数组来维护的，通过组合多个 digit（uint32_t）来实现大整数的存储。这么做的好处就是 Python 整数没有大小限制了，因此不会溢出，而不会溢出是因为数组没有长度限制，所以只要你的内存足够，就可以存任意大的数。 Python 表示：存不下？会溢出？这都不是事儿，直接继续往数组里面塞 digit 就 ok 了。另外数组存的是绝对值，符号是通过 ob_size 体现的。 不过说实话，用数组实现大整数的做法非常普遍，并没有什么神秘的，就是将多个整数组合起来，模拟具有更高位的大整数。但这种实现方式的难点在于大整数的数学运算，它们才是重点，实现的时候比较考验编程技巧以及思维逻辑。 因此 Python 的整数比浮点数要复杂的多，浮点数在底层直接用 C 的 double 来维护具体的值，因此运算的话，比如相加，直接转成 C 的 double 做加法即可。但整数就不行了，在底层不能简单地将数组相加。 下面来看看具体实现。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 楔子","id":"71","title":"楔子"},"72":{"body":"先来看看整数的大小比较，由于整数具体的值是通过数组维护的，显然数组越长，整数的绝对值就越大，这是毫无疑问的。至于整数的正负，则由 ob_size 来体现。 因此可以得出一个结论：当两个整数在比大小时，可以先比较各自的 ob_size，如果 ob_size 不一样，可以直接比较出大小，并且 ob_size 越大，对应的整数越大。但如果两个整数的 ob_size 一样，那么就从数组 ob_digit 的尾部元素开始，不断向前进行比较。只要两个整数的 ob_digit 中有一个对应元素不相同，那么就可以比较出大小。 之所以从数组的尾部开始，是因为数组元素的索引越大，那么充当的位数就越高，而在比较的时候显然要从高位开始比。 # ob_digit = [892311, 32, 3]\na = 3458764548181171607\n# ob_digit = [2296, 31, 3]\nb = 3458764547106539768 我们以 a 和 b 为例，显然 a 大于 b，那么在底层，它们是如何比较的呢？ 如果 ob_size 不相等，那么可以直接比较出大小。但这里两个整数的 ob_size 是相等的，所以需要比较 ob_digit，并且是从后往前比。具体做法就是让索引从 ob_digit 长度减 1 开始，依次往前遍历。 因为 a->ob_digit[2] 等于 b->ob_digit[2]，此时无法比较出大小，因此索引减一，比较上一个元素。 因为 a->ob_digit[1] 大于 b->ob_digit[1]，所以成功比较出大小，可以得出 |a| 大于 |b|。 当然啦，由于数组反映的是绝对值的大小，所以还需要判断符号。 如果是正数，那么和绝对值相同。 但如果是负数，那么绝对值越大，对应的整数反而越小，因此比较之后的结果还要再乘上 -1。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 3) ] a = 3458764548181171607\nb = 3458764547106539768\nlong_obj1 = PyLongObject.from_address(id(a))\nlong_obj2 = PyLongObject.from_address(id(b))\nprint(list(long_obj1.ob_digit)) # [892311, 32, 3]\nprint(list(long_obj2.ob_digit)) # [2296, 31, 3] 以上就是整数的大小比较逻辑，下面再看一下具体的源码实现。 int 类型对象的 tp_richcompare 字段的值为 long_richcompare，所以具体的比较逻辑便由该函数负责实现。 // Objects/longobject.c static PyObject *\nlong_richcompare(PyObject *self, PyObject *other, int op)\n{ // 比较结果 int result; // 类型检测，确保 self 和 other 的类型都是整数 CHECK_BINOP(self, other); // self 和 other 都是泛型指针 PyObject * // 如果 self == other，说明指针保存的地址相同，它们指向的是同一个对象 // 因此可以直接判定两者相等 if (self == other) result = 0; else // 否则调用 long_compare，将对象维护的 ob_digit 抽出来，挨个比较 // 如果 self > other，那么 result 为 1 // 如果 self == other，那么 result 为 0 // 如果 self < other，那么 result 为 -1 result = long_compare((PyLongObject*)self, (PyLongObject*)other); // 一会儿解释 Py_RETURN_RICHCOMPARE(result, 0, op);\n} 在 Python 中不同的算术操作符会对应不同的魔法方法，而在 C 中均由 long_richcompare 函数实现。 而在 long_richcompare 里面，不管操作符是什么，result 都是固定的。 如果 self > other，那么 result 为 1； 如果 self == other，那么 result 为 0； 如果 self < other，那么 result 为 -1； 不管我们传入的操作符 op 是什么，都不影响上面的结论，因为 result 只是表达了 self 和 other 之间的关系。然后再看一下结尾的 Py_RETURN_RICHCOMPARE 这个宏，它的定义如下。 // Include/object.h\n#define Py_RETURN_RICHCOMPARE(val1, val2, op) \\ do { \\ switch (op) { \\ case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ default: \\ Py_UNREACHABLE(); \\ } \\ } while (0) 这个宏做的事情很简单，就是基于操作符比较 val1 和 val2，如果 if 条件成立，返回 Python 的 True，否则返回 Python 的 False。而在 long_richcompare 里面，最后调用这个宏的时候，给 val1、val2 传的是 result 和 0。注意：这一步稍微有点绕，我们举个例子就简单了。 假设 self = 5，other = 6，我们要判断 self > other 是 True 还是 False。 首先 self 小于 other，因此在 long_richcompare 里面比较之后，result 会等于 -1。那么调用宏的时候，传的三个参数就是 -1、0、Py_GT。然后执行对应分支，发现 val1 > val2 不成立，于是返回 False，因此 self > other 的结果也是 False。 所以 long_richcompare 里面的 result 只是通过 1、0、-1 描述了 self 和 other 之间的关系（C 语言的特点之一），而判断 self > other 最终等价于判断 result > 0，同理其它操作符也是如此。 再举个例子，假设要判断 self <= other，那么最终等价于判断 result <= 0。 如果 self > other，那么 result 就是 1，而 1 <= 0 不成立，所以 self <= other 就是 False。 如果 self == other，那么 result 就是 0，而 0 <= 0 成立，所以 self <= other 就是 True。 如果 self < other，那么 result 就是 -1，而 -1 <= 0 成立，所以 self <= other 就是 True。 因此最后这一步还是很巧妙的，但也稍微有一点绕。估计有人会好奇，为啥不能像浮点数那样直接比较呢？其实原因很好想，因为浮点数在底层使用 double 类型的字段来维护具体的值，比较逻辑非常简单。但整数不同，由于整数的值是通过数组维护的，比较起来非常复杂，如果还按照上面那种做法，那么每个分支里面会存在大量重复代码。 所以整数在比较的时候，先不管指定的操作符是什么，而是先判断两个数的大小关系。如果两个数是大于关系，那么给 result 赋值为 1；等于关系，赋值为 0；小于关系，赋值为 1。 最后将两个整数的比较操作，转成 result 和 0 的比较操作，这个实现思路非常巧妙，你在工作中也可以用起来。 但是还没结束，我们还有最关键的一步没有看。 显然这最关键的一步就在 long_compare 身上，它负责具体的比较逻辑。 // Objects/longobject.c static int\nlong_compare(PyLongObject *a, PyLongObject *b)\n{ Py_ssize_t sign; // 如果两个整数的 ob_size 不一样，那么直接可以比较出大小 if (Py_SIZE(a) != Py_SIZE(b)) { sign = Py_SIZE(a) - Py_SIZE(b); } else { // 否则说明 ob_size 一样，那么获取 ob_size 的绝对值，即数组 ob_digit 的长度 Py_ssize_t i = Py_ABS(Py_SIZE(a)); // 从后往前依次比较数组元素的大小 while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果两个数组的元素全部一样，那么 i 最终会等于 -1 if (i < 0) sign = 0; // 否则说明两个数组中索引为 i 的元素存在不同 else { // 那么比较大小 sign = (sdigit)a->ob_digit[i] - (sdigit)b->ob_digit[i]; // 如果 ob_size < 0，说明是负数，那么比较结果还要再乘上 -1 if (Py_SIZE(a) < 0) sign = -sign; } } // 如果 a < b，那么 sign < 0，直接返回 -1 // 如果 a == b，那么 sign == 0，直接返回 0 // 如果 a > b，那么 sign > 0，直接返回 1 return sign < 0 ? -1 : sign > 0 ? 1 : 0;\n} 以上就是 Python 整数的比较逻辑，所以一个简单的整数比较，Python 底层居然做了这么多工作。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 整数的大小比较","id":"72","title":"整数的大小比较"},"73":{"body":"以上就是整数的比较逻辑，所以用数组实现大整数的思路没什么特别的，但难点就在于运算。而为了方便大家理解和消化，本篇文章暂时只介绍比较操作，下一篇文章来介绍整数的运算。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 小结","id":"73","title":"小结"},"74":{"body":"本篇文章来探讨一下整数的加减法是怎么做的，因为整数在底层采用数组进行存储，所以它的加减法就不像浮点数那么简单。 在介绍浮点数的时候说过，对于数值型对象，它的类型一定实现了 tp_as_number 字段，该字段指向了 PyNumberMethods 结构体实例。结构体里面的每个字段都是一个函数指针，对应数值型对象的一个操作。 比如 nb_add 负责加法操作，nb_substract 负责减法操作等等，本篇文章就来探讨一下。首先整数支持的操作非常多，这里我们只探讨加减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 楔子","id":"74","title":"楔子"},"75":{"body":"整数的加法和减法分别由 long_add 和 long_sub 实现，但运算的核心却不在这两个函数上，它们内部会调用另外两个函数。因为数组保存了整数的绝对值，所以 Python 将整数的运算转成了绝对值运算，而底层有两个函数专门用来做这件事情，分别是 x_add 和 x_sub。 x_add(a, b)：计算 a 和 b 的绝对值之和； x_sub(a, b)：计算 a 和 b 的绝对值之差； 所以整数相加就可以这么做，假设两个整数 a 和 b 相加： 如果 a 和 b 均为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 如果 a 和 b 均为负数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 而整数相减也是同理，还是整数 a 和 b，两者相减： 如果 a 为正数，b 为负数，那么通过 x_add 计算两者的绝对值之和即可； 如果 a 为负数，b 为正数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 和 b 均为正数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果 a 和 b 均为负数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 相加时，符号相同会调用 x_add、符号不同会调用 x_sub。相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 所以这就是 Python 的设计，因为绝对值的加减法不用考虑符号的影响，实现更为简单，所以 Python 将整数运算转化成整数的绝对值运算。那么下面我们的重心就在 x_add 和 x_sub 上面了，看看它们是如何对大整数绝对值进行运算的。到这里你可能会有疑问，大整数运算这么复杂，效率会差吧。显然这是啃腚的，整数数值越大，整数对象的底层数组就越长，运算开销也就越大。 但 Python 底层有一个机制叫做快分支，因为通用逻辑能处理所有情况，那么它的效率必然不高。而快分支则是对那些可以简单运算的情况提前进行处理，比如在对 a 和 b 计算加减法的时候，底层会先判断数组的长度是否均小于等于 1，如果是则说明数组中最多只有一个元素。这样的话，就可以直接转成 C 的整数进行运算了，这样性能损耗就可以忽略不计。 关于快分支，需要再单独解释一下。我们举个生活中的例子：好比你去见女朋友，正常情况下，你需要买花，并且精心打扮。但如果女朋友不在生理期，那么这一切都不需要做，只需买杯奶茶就好了。所以先判断女朋友是否在生理期，如果不在，那么只需买杯奶茶就能牵手便属于快分支。快分支具有命中率高等特点，绝大部分都是这个情况，而一旦命中快分支，那么程序便可快速处理。 回到上面的例子，只要整数不超过 2 ** 30 - 1，都可以走快分支，显然这可以满足绝大部分场景，因为这个数字已经很大了。至于 x_add 和 x_sub 则属于通用逻辑，而通用也意味着平庸，但如果快分支没有命中，那么就只能走通用逻辑了。 而我们的重点就是要研究 x_add 和 x_sub 的实现，感受大整数运算的魅力。不过在介绍之前，不妨想象一下我们平时将两个整数相加的时候是怎么做的。 从最低位开始进行相加，逢十进一，ob_digit 也是同理。我们可以把数组中的每一个元素看成是一个整体，只不过它不再是逢十进一，而是逢 2 ** 30 进一。 # 数组的每个元素最大能表示 2 ** 30 - 1\n# 把元素整体想象成我们生活中加法的个位、十位、百位...\n# 然后对应的位相加，逢 2 ** 30 进一\na = [1024, 22]\nb = [342, 18]\nc = [1024 + 342, 22 + 18] # [1366, 40] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 所以仍旧是对应的位进行相加，和我们生活中的加法并无本质上的区别。只不过生活中的加法，每一位能表示 0~9，逢十进一。而 Python 底层的加法，因为整数使用数组存储，那么每一个位能表示 0 ~ 2 ** 30 - 1，逢 2 ** 30 进一。 把 1024、342 想象成个位，把 22、18 想象成十位，并且此时不再是逢十进一，而是逢 2 ** 30 进一。 a = [2 ** 30 - 1, 16]\nb = [2 ** 30 - 1, 21]\n# a[0] + b[0] 超过了 2 ** 30，要进个 1\n# 而逢十进一之后，该位要减去十\n# 那么逢 2 ** 30 进一之后，显然要减去 2 ** 30\nc = [ a[0] + b[0] - 2 ** 30, a[1] + b[1] + 1\n] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 然后是绝对值减法，和绝对值加法一样，也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，由于 7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 18。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]\n# 所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 然后是 a[1] - b[1]\n# 由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 结果没有问题，以上我们就从原理上介绍了大整数的加减法，下面再看一下源码实现。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法的运算原理","id":"75","title":"整数加减法的运算原理"},"76":{"body":"当整数相加时会执行 long_add 函数，看一下它的具体实现。 // Objects/longobject.c\nstatic PyObject *\nlong_add(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 // 由于 2 ** 30 - 1 已经很大了，所以绝大部分场景，都会执行此分支 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { // MEDIUM_VALUE 是一个宏，接收一个 abs(ob_size) <= 1 的 PyLongObject * // 如果 ob_size 等于 0, 那么返回 0 // 如果 ob_size 等于 1, 那么返回 ob_digit[0] // 如果 ob_size 等于 -1, 那么返回 -ob_digit[0] // 所以计算出 MEDIUM_VALUE(a) + MEDIUM_VALUE(b) 之后 // 将结果转成 PyLongObject，然后返回其泛型指针即可 // 因此当数组中元素个数不超过 1 的时候，显然是可以直接相加的 return PyLong_FromLong(MEDIUM_VALUE(a) + MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| + |b| if (Py_SIZE(b) < 0) { z = x_add(a, b); if (z != NULL) { // 然后对 z 取相反数 assert(Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } // 如果 a 是负数、b 是正数，那么计算 |b| - |a| else z = x_sub(b, a); } else { // 如果 a 是正数、b 是负数，那么计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| + |b| else z = x_add(a, b); } return (PyObject *)z;\n} 因此 long_add 函数并不长，但是调用了 x_add 和 x_sub，显然核心逻辑是在这两个函数里面。至于 long_add 函数，它的逻辑如下： 判断两个整数底层对应的数组的长度是否均小于等于 1，如果是的话那么通过宏 MEDIUM_VALUE 直接将其转成 C 的一个 digit，当然符号也会考虑在内。然后直接相加、返回即可。显然这里走的是快分支，或者说快速通道。 但如果其中一方的数组长度（ob_size）大于 1，那么判断两者的符号。如果都为负数，那么通过 x_add 计算两者的绝对值之和，然后取相反数。 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果都为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 所以 Python 整数设计的非常巧妙，ob_digit 虽然用来维护具体数值，但它并没有考虑正负，整数的正负是通过 ob_size 来表示的。通过将运算变成绝对值运算，实现起来会方便很多。 说完了 long_add，再来看看 long_sub，这两者是类似的。 // Objects/longobject.c\nstatic PyObject *\nlong_sub(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { return PyLong_FromLong(MEDIUM_VALUE(a) - MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是负数、b 是正数，那么先计算 |a| + |b| else z = x_add(a, b); // 然后对 z 取相反数 if (z != NULL) { assert(Py_SIZE(z) == 0 || Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } else { // 如果 a 是正数、b 是负数，那么计算 |a| + |b| if (Py_SIZE(b) < 0) z = x_add(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| - |b| else z = x_sub(a, b); } return (PyObject *)z;\n} 所以 long_add 和 long_sub 的代码是类似的，它们将整数的运算转成了整数的绝对值运算，所以关键要理解什么时候用 x_add，什么时候用 x_sub。 a + b 如果 a 是正数，b 是正数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数、b 是负数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数、b 是正数，调用 x_sub(b, a)，计算 |b| - |a|； 所以相加时，符号相同会调用 x_add、符号不同会调用 x_sub。 a - b 如果 a 是正数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是正数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数，b 是正数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数，b 是负数，调用 x_sub(b, a)，计算 |b| - |a|。当然在源码中调用的是 x_sub(a, b)，计算 |a| - |b|，然后再取相反数； 所以相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 接下来我们的重点就是绝对值加法和绝对值减法的具体实现细节。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法源码实现","id":"76","title":"整数加减法源码实现"},"77":{"body":"函数 x_add 负责绝对值加法，但是介绍之前，需要先了解几个宏，它们在 x_add 中会有体现。 // Include/longintrepr.h\n#define PyLong_SHIFT 30\n#define PyLong_BASE ((digit)1 << PyLong_SHIFT)\n#define PyLong_MASK ((digit)(PyLong_BASE - 1)) 显然 PyLong_BASE 等于 2 ** 30，PyLong_MASK 等于 2 ** 30 - 1（说明 32 个位，前两个位是 0，后三十个位都是 1）。 然后我们可以看 x_add 的具体实现了。 // Objects/longobject.c static PyLongObject *\nx_add(PyLongObject *a, PyLongObject *b)\n{ // 参数 a 和 b 指向了两个要相加的整数对象 // 获取整数在底层的 ob_size Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // 指向两个整数的相加结果 PyLongObject *z; // 循环变量 Py_ssize_t i; // 每个部分的运算结果 digit carry = 0; // 如果 size_a 小于 size_b，说明 |a| < |b| // 那么将两个整数交换位置，确保操作符左边的数大于右边的数 // 这么做也符合人类习惯，可以想象一下小学时候的加法计算 // 如果一个位数多，一个位数少，也会习惯将位数多的放在左边 if (size_a < size_b) { { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 申请一个 ob_digit 的长度为 size_a + 1 的 PyLongObject // 但为什么是 size_a + 1 呢? 由于上面的 if 语句，使得 size_a 一定不小于 size_b // 那么 a 和 b 相加之后的 z 的 ob_size 一定不小于 size_a // 但是也可能比 size_a 多 1，比如: a = 2 ** 60 - 1, b = 1 // 那么相加之后结果为 2 ** 60，于是 ob_size 就变成了 3 // 因此在创建 z 的时候，ob_digit 的容量会等于 size_a + 1 z = _PyLong_New(size_a+1); // 正常情况下, z 是一个 PyLongObject *，但如果 z == NULL, 表示分配失败（程序崩溃） // 但说实话, 除非你内存不够了, 否则这种情况不会发生 if (z == NULL) return NULL; // 重点来了，因为 size_a > size_b，所以会以 size_b 为准，两者从低位向高位依次对应相加 // 当 b 到头了，再单独算 a 的剩余部分 // 因此以 i < size_b 作为条件 for (i = 0; i < size_b; ++i) { // 将 a->ob_digit[i] + b->ob_digit[i] + carry（初始为 0）作为 carry // 如果 carry 没有超过 2 ** 30 - 1，那么它就是 z -> ob_digit[i] 的值 carry += a->ob_digit[i] + b->ob_digit[i]; // 但 carry 是可能溢出的，当溢出时，应该要减去 2 ** 30，所以还要判断是否产生了进位 // 但解释器没有使用常规的判断，而是选择了效率更高的位运算（carry & PyLong_MASK） // 由于 PyLong_MASK 等于 (1 << 30) - 1，所以它的前两个位是 0，后面三十个位全是 1 // 因此当 carry 不超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry // 当 carry 超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry - 2 ** 30 z->ob_digit[i] = carry & PyLong_MASK; // 然后当 carry 产生进位时，显然不可以丢，它们要作用在数组中下一个元素相加的结果上 // 所以这里将 carry 右移 30 位，得到进位，然后重新赋值给 carry，并作用在下一轮循环中 // 如果没有产生进位，那么 carry 为 0，如果产生了进位，那么 carry 为 1 carry >>= PyLong_SHIFT; } // 如果 b 到头了, 那么继续从当前的 i 开始遍历，直到 i == size_a, 逻辑还是和上面一样 for (; i < size_a; ++i) { // 此时只需要加上 a->ob_digit[i] 和 carry 即可，因为 b 到头了 carry += a->ob_digit[i]; // 这里也要按位与 PyLong_MASK, 因为也可能存在进位的情况 // 拿生活中的 99999 + 1 为例，此时 a = 99999, b = 1，显然第一次循环 b 就到头了 // 但后面单独循环 a 的时候, 依旧会产生进位，所以这里也是同理 z->ob_digit[i] = carry & PyLong_MASK; // carry 右移 30 位得到进位，然后重新赋值给 carry carry >>= PyLong_SHIFT; } // 两个循环结束之后, 其实还差一步，还拿 99999 + 1 举例子 // 按照顺序相加得到的是 00000，因为最后还进了一个 1，这里的 carry 也是同理 // 因此 z 的 ob_size 要比 size_a 多 1，目的就在于此 // 所以要将 z->ob_digit 的最后一个元素设置成 carry z->ob_digit[i] = carry; // 但如果最后的 carry 没有进位的话，显然其结果就是 0 // 所以最后没有直接返回 z，而是返回了 long_normalize(z) // 这个 long_normalize 函数的作用是从后往前依次检查 ob_digit 的元素 // 如果为 0，那么就将其 ob_size 减去 1, 直到出现一个不为 0 的元素 // 比如 ob_digit 为 [0, 3, 1, 0, 0, 0]，长度为 6，但规范化之后的 ob_size 显然是 3 // 不过对于当前来说，显然最多只会检查一次，因为它的 ob_size 只比 size_a 多 1 // 所以判断数组最后一个元素是否为 0 也可以，如果为 0 则说明没有产生进位 return long_normalize(z);\n} 整数在底层实现的很巧妙，不理解的话可以多看几遍，然后我们在 Python 的层面上再反推一下绝对值加法，进一步感受底层的运算过程。 # 假设有 a 和 b 两个整数\n# 当然这里是使用列表直接模拟底层数组 ob_digit\na = [1073741744, 999, 765, 123341]\nb = [841, 1073741633, 2332]\n# 然后创建 z，表示 a 和 b 的相加结果\nz = [] # 为了更直观，我们一步步手动相加\n# 首先是 a[0] + b[0]，得到 carry\ncarry = a[0] + b[0]\n# 但 carry 可能大于 2 ** 30 - 1，所以要进行判断\n# 如果大于，那么要减去 2 ** 30，否则保持不变\n# 而这一步可以使用位运算来实现，将 carry 和 (2 ** 30 - 1) 按位与即可\nprint(carry & (2 ** 30 - 1)) # 761\n# 结果是 761，说明 carry 比 2 ** 30 - 1 大\n# 然后 z 的第一个元素就是 761\nz.append(761) # 接着计算 a[1] + b[1] 得到新的 carry\n# 但是之前的 carry 大于 2 ** 30 - 1，所以还要再加上 carry >> 30，即进位\n# 当然，如果没有产生进位，那么 carry >> 30 就是 0\ncarry = (carry >> 30) + a[1] + b[1]\n# 然后 carry & (2 ** 30 - 1) 得到 809，说明 carry 依旧大于 2 ** 30 - 1\nprint(carry & (2 ** 30 - 1)) # 809\n# 所以 z 的第二个元素就是 809\nz.append(809) # 计算 a[2] + b[2] 的时候也是同理\ncarry = (carry >> 30) + a[2] + b[2]\n# 但显然此时的 carry 已经不大于 2 ** 30 - 1 了\nprint(carry & (2 ** 30 - 1)) # 3098\n# 说明 z 的第三个元素是 3098\nz.append(3098) # 此时 b 到头了，所以直接将 a[3] 作为 carry\n# 当然还要判断上一步的 carry 是否大于 2 ** 30 - 1\n# 所以还是右移 30 位，当不大于 2 ** 30 - 1 时，carry >> 30 就是 0\ncarry = (carry >> 30) + a[3]\nprint(carry & (2 ** 30 - 1)) # 123341\nz.append(123341) # 此时 a 也遍历完毕，但是不要忘记再对 carry 进行判断\n# 如果大于 2 ** 30 - 1，那么会产生进位，所以 z 还要再 append 一个 1\n# 当然这里 carry 没有超过 2 ** 30 - 1 # 此时 z 为 [761, 809, 3098, 123341]\nprint(z) # [761, 809, 3098, 123341] # a = [1073741744, 999, 765, 123341]\n# b = [841, 1073741633, 2332]\n# z = [761, 809, 3098, 123341]\n# 因此 ob_digit 为 [1073741744, 999, 765, 123341]\n# 和 ob_digit 为 [841, 1073741633, 2332] 的两个 PyLongObject 相加\n# 得到的新的 PyLongObject 的 ob_digit 为 [761, 809, 3098, 123341]\nprint( a[0] + a[1] * 2 ** 30 + a[2] * 2 ** 60 + a[3] * 2 ** 90 + b[0] + b[1] * 2 ** 30 + b[2] * 2 ** 60 == z[0] + z[1] * 2 ** 30 + z[2] * 2 ** 60 + z[3] * 2 ** 90\n) # True 以上就是绝对值加法，我们从源码的角度和 Python 代码的角度分别解释了一遍。看完了绝对值加法，再来看看绝对值减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值加法：x_add","id":"77","title":"绝对值加法：x_add"},"78":{"body":"和绝对值加法一样，绝对值减法也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 17。 // Objects/longobject.c static PyLongObject *\nx_sub(PyLongObject *a, PyLongObject *b)\n{ // 依旧是获取两者的 ob_size 的绝对值 Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // z 指向相加之后的 PyLongObject PyLongObject *z; // 循环变量 Py_ssize_t i; // 如果 size_a 小于 size_b，那么 sign 就是 -1，否则就是 1 int sign = 1; // 之前 carry 保存相加的结果，这里的 borrow 保存相减的结果 // 名字很形象，相加要进位叫 carry，相减要借位叫 borrow digit borrow = 0; // 接下来依旧要判断两个整数的大小，确保相减的时候，绝对值大的一方在左边 // 相加的时候，大的一方在左边还是在右边，其实没太大影响 // 而相减的时候如果大的一方在左边，显然会省事很多 // 所以如果 size_a 比 size_b 小，说明 a 的绝对值比 b 小 if (size_a < size_b) { // 那么令 sign = -1，因为 a 和 b 交换了位置，所以后续相减之后还要再乘上 sign // 因为计算的是绝对值之差，符号是在绝对值之差计算完毕之后通过 sign 判断的 sign = -1; // 交换 a 和 b 的位置 { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 如果 size_a == size_b，那么需要依次比较 ob_digit 里的元素，才能判断出大小 else if (size_a == size_b) { // 所以从 ob_digit 的尾部开始遍历 i = size_a; while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果所有元素都相等，那么 i 会等于 -1，相减的结果为 0，此时直接返回 0 即可 // 所以这一步也是为了能够快速返回结果，而额外做的一层判断 if (i < 0) return (PyLongObject *)PyLong_FromLong(0); // 但如果某个对应的元素不相等，那么只需判断这两者谁大谁小即可 // 假设 a 的 ob_digit 是 [2, 3, 4, 5]，b 的 ob_digit 是 [1, 2, 4, 5] // 那么上面的 while 循环结束之后，i 会等于 1，显然只需要判断索引为 1 时，对应的值谁大谁小即可 if (a->ob_digit[i] < b->ob_digit[i]) { // 如果 a->ob_digit[i] < b->ob_digit[i]，同样说明 a 小于 b // 那么将 sign 设置为 -1，并交换 a 和 b 的位置 sign = -1; { PyLongObject *temp = a; a = b; b = temp; } } // 因为高位在减法的时候会被抵消掉，所以将 size_a 和 size_b 设置成 i + 1 即可 // 假设两个整数的 ob_digit 分别是 [2, 3, 4, 5] 和 [1, 2, 4, 5] // 因为后两个元素是一样的，所以后续只需要对索引为 [0: i+1] 的部分做差即可 size_a = size_b = i+1; } // a 和 b 相减之后，结果一定不超过 a，因此 ob_digit 的长度一定小于等于 size_a z = _PyLong_New(size_a); if (z == NULL) return NULL; // 然后下面的逻辑和 x_add 是类似的 for (i = 0; i < size_b; ++i) { // 让 a 的 ob_digit[i] 减去 b 的 ob_digit[i] // 当然，由于上一个元素在相减的时候，可能会向当前元素借位，因此还要再减去 borrow // 如果没借位，那么 borrow 是 0，如果借位了，那么 borrow 是 1 // 然后如果当前元素相减的结果也小于 0，那么继续向下一个元素借位 // 但我们似乎没有看到借位的逻辑，这是因为 digit 是无符号 32 位整型，负数会发生环绕 // 假设这里相减得到的是 -100，那么结果就是 2 ** 32 - 100 // 所以存储的负数会变成 \"2 ** 32 + 该负数\"，相当于自动向数组的下一个元素借了一位 // 但 digit 只用 30 个位，所以借一位之后应该加上 2 ** 30，而目前加的是 2 ** 32 borrow = a->ob_digit[i] - b->ob_digit[i] - borrow; // 所以还要和 PyLong_MASK 按位与，只保留后 30 个位的值 // 当然如果没有产生借位，borrow & PyLong_MASK 的结果还是 borrow z->ob_digit[i] = borrow & PyLong_MASK; // 如果借位了，下一轮循环的时候，肯定要多减个 1，但问题是怎么判断有没有借位呢？ // 很简单，如果没有借位，borrow 一定小于 2 ** 30，第 31 个位一定是 0 // 如果借位了，那么 borrow 一定大于 2 ** 30，第 31 个位一定是 1 // 所以让 borrow 右移 30 个位 borrow >>= PyLong_SHIFT; // 然后和 1 按位与，如果产生了借位，borrow 就是 1，否则就是 0 // 等到下一轮循环的时候，再减去 borrow borrow &= 1; /* 所以 Python 底层的整数只用 30 个位真的非常巧妙，尤其是在减法的时候 由于 digit 是 32 位，借位时会加上 2 ** 32 但底层只用 30 个位，所以再和 PyLong_MASK 按位与，只保留后 30 个位 而当前元素如果借位了，那么数组下一个元素要减去 1，但怎么判断它有没有借位呢？ 首先两个不超过 2 ** 30 - 1 的数，相减的结果如果为正（没产生借位） 那么一定也不会超过 2 ** 30 - 1，换句话说其结果对应的第 31 位一定是 0 但如果两个整数相减的结果为负，那么会自动加上 2 ** 32，因此第 31 位一定是 1 所以再让 borrow 右移 30 位，并和 1 按位与 如果结果为 1，证明相减为负数，确实向下一个元素借了 1，因此下一次循环时会多减一个 1 如果结果为 0，那么说明没有借位，下一次循环时相当于多减了一个 0 */ } // 如果 size_a 和 size_b 不相等，那么还需要继续处理 a 的 ob_digit 剩余的元素 for (; i < size_a; ++i) { // 这里的逻辑和之前分析 x_add 是类似的 borrow = a->ob_digit[i] - borrow; z->ob_digit[i] = borrow & PyLong_MASK; borrow >>= PyLong_SHIFT; borrow &= 1; } // 只不过由于不会产生进位，因此不需要再对 borrow 做额外判断 // 而 x_add 中最后还要判断 carry 有没有进位 assert(borrow == 0); // 如果 sign < 0，那么证明是负数，因此还要改变 z 的符号 if (sign < 0) { Py_SIZE(z) = -Py_SIZE(z); } // 最后同样要将 z 规范化，将高位的 0 忽略掉 // 比如 100000 - 99999，结果是 000001，显然只需要保留最低位的 1 即可 // 另外如果相减的结果是小整数，那么直接从池子里获取，否则返回新创建的 return long_normalize(z);\n} 同样的，关于绝对值减法，我们也用 Python 代码演示一遍，感受底层的运算过程。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]，所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 注：源码中加的是 2 ** 32，所以之后还要和 PyLong_MASK 按位与\n# 因此 a[0] + 2 ** 30 - b[0] 等价于 (a[0] + 2 ** 32 - b[0]) & (2 ** 30 - 1) # 然后是 a[1] - b[1]，由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 以上就是绝对值减法，设计的非常巧妙，可以多看几遍，并用列表模拟 ob_digit 数组，然后实际测试一下。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值减法：x_sub","id":"78","title":"绝对值减法：x_sub"},"79":{"body":"关于整数的内容，我们就介绍完了。回顾一下，首先我们剖析了整数的底层实现，了解了它不会溢出的奥秘，然后又介绍了小整数对象池。但也正如之前所说，使用数组实现大整数并不是什么特别新颖的思路，它的难点在于数学运算，这是非常考验编程技巧的地方。 而我们这里只是分析了加减法，至于乘除则更加复杂，这里就不再分析了。关于乘法，解释器采用的是效率更高的 karatsuba 算法，比较有意思，有兴趣可以自己查看一下。 综上所述不难发现 Python 效率低的原因，毕竟一个简单的整数运算都要做这么多工作。当然了，解释器内部也定义了很多快分支，会提前检测能否使用快速通道进行处理，当无法使用快速通道时，再走通用逻辑。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 小结","id":"79","title":"小结"},"8":{"body":"以上我们就聊了聊 Python 的变量和对象，核心就在于：变量保存的不是对象本身，而是对象的内存地址，站在 C 的角度上看变量就是一个指针。 尽管 Python 一切皆对象，但你拿到的都是对象的指针，变量是一个指针，函数是一个指针，元组、列表、字典里面存储的还是指针。我们可以想象一下列表，它底层是基于数组实现的，由于 C 数组要求里面每个元素的类型和大小都相同，因此从这个角度上讲，列表内部存储的只能是指针。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 小结","id":"8","title":"小结"},"80":{"body":"本篇文章来聊一聊布尔值是怎么实现的，在 Python 里面 True 和 False 虽然是关键字，但它们其实也是对象。 下面我们就来详细地解释一下。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 楔子","id":"80","title":"楔子"},"81":{"body":"先来说一下布尔类型本身，我们知道 bool 继承自 int，所以 True 和 False 也具备整数的特征。 print(bool.__base__) # <class 'int'>\nprint(isinstance(True, bool)) # True # True 和 False 可以当成 1 和 0 来用\nprint(True * 2) # 2\nprint(3 // 3 == True) # True\nprint(sum([True, 1, 2])) # 4\nprint(False + 1) # 1 bool 在底层对应 PyBool_Type，因此我们可以肯定地讲，PyBool_Type 的 tp_base 字段的值一定是 &PyLong_Type。 // Objects/boolobject.c\nPyTypeObject PyBool_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bool\", sizeof(struct _longobject), 0, 0, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ bool_repr, /* tp_repr */ &bool_as_number, /* tp_as_number */ // ... &PyLong_Type, /* tp_base */ // ...\n}; bool 继承 int，所以它也实现了 tp_as_number。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔类型","id":"81","title":"布尔类型"},"82":{"body":"既然 bool 继承 int，那么布尔值和整数的底层结构是一样的。 // Objects/boolobject.c // PyLongObject 是 struct _longobject 的类型别名\nstruct _longobject _Py_FalseStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 0) { 0 }\n}; struct _longobject _Py_TrueStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 1) { 1 }\n}; 我们看到布尔值在底层是静态定义好的 PyLongObject 结构体实例，ob_digit 分别为 [0] 和 [1]，所以 False 和 True 完全可以当成 0 和 1 来用。当然啦，由于变量都是 PyObject *，所以这两个结构体实例一般不直接用，而是用底层提供的两个宏。 // Include/boolobject.h /* Use these macros */\n#define Py_False ((PyObject *) &_Py_FalseStruct)\n#define Py_True ((PyObject *) &_Py_TrueStruct) 当返回 Python 的 True 和 False 时，底层会返回 Py_True 和 Py_False，也就是转成 PyObject * 之后再返回。为此解释器还提供了两个宏。 // Include/boolobject.h #define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True\n#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False 当然这些应该比较简单了。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的底层结构","id":"82","title":"布尔值的底层结构"},"83":{"body":"创建布尔值有两种方式，一种是基于 C 整数创建，另一种是将 Python 对象转成布尔值。 基于 C 整数创建，会通过 PyBool_FromLong 函数，显然它是布尔对象的特定类型 API。 // Objects/boolobject.c PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 这个特定类型 API 一般都是解释器内部使用，或者编写扩展的时候使用。而除了这种方式，我们还可以调用 bool 类型，将对象转成布尔值。 // Objects/boolobject.c // 基于 Python 对象创建，比如 bool(obj)\n// 显然会调用 PyBool_Type 的 tp_new，在底层该字段被赋值为 bool_new\ntatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 保存接收的参数，先设置为 False PyObject *x = Py_False; long ok; // bool 类型不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 最多接收 1 个位置参数，解析出来赋值给 x // 如果不传位置参数，那么 x 就是上面设置的 Py_False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 Pyobject_Islrue 判断 x 是真是假 // 如果为真返回 1，否则返回 0 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 将整数转成布尔值 return PyBool_FromLong(ok);\n} 所以核心就在 PyObject_IsTrue 函数里面，看一下它的内部逻辑。 // Objects/object.c\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身是布尔值 True，那么返回 1 if (v == Py_True) return 1; // 如果 v 本身是布尔值 False，那么返回 0 if (v == Py_False) return 0; // 如果 v 是 None，那么返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且它的类型对象定义了 __bool__，那么调用 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且它的类型对象定义了 __len__，那么调用 // 说白了就是基于内部的键值对个数进行判断 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且它的类型对象定义了 __len__，那么调用 // 也就是基于内部的元素个数进行判断 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 否则默认为真，比如我们自定义类的实例 else return 1; // 如果 res 大于 0，返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} 当 PyObject_IsTrue 调用完之后，再基于 PyBool_FromLong 创建布尔值即可，我们用 Python 代码演示一下。 # 不传参数，默认返回 False\nprint(bool()) # False # 整数实现了 __bool__，所以 bool(1) 会调用 int.__bool__(1)\nprint(bool(1)) # True # 字符串实现了 __len__，所以 bool(\"abc\") 会调用 str.__len__(\"abc\")\nprint(bool(\"abc\")) # True class A: pass # 自定义类没有实现 __bool__、__len__\n# 所以在 PyObject_IsTrue 里面最终会走 else 分支，直接为真\nprint(bool(A())) # True # 但如果定义了 __len__，那么是否为真取决于 __len__ 的返回值\n# 并且 __len__ 要定义在类型对象里面，因为 a.__len__() 其实只是语法糖\n# 底层真正执行的是 A.__len__(a)，关于这部分细节后续介绍类的时候会细说\ntype.__setattr__(A, \"__len__\", lambda self: 0)\n# 因为 __len__ 返回的是 0，所以为假，注意：__len__ 要返回整数\nprint(bool(A())) # False # 如果再实现一个 __bool__ 呢？\ntype.__setattr__(A, \"__bool__\", lambda self: True)\n# 我们发现结果又变成了 True，因为 __bool__ 返回的是 True（必须返回布尔值）\n# 并且在源码中，__bool__ 查找的优先级高于 __len__\nprint(bool(A())) # True 现在你是不是对布尔值有一个更深的印象了呢？一个简单的布尔值，居然有这么多可说的。 但是还没结束，我们还要补充一个知识点，先看一段代码。 name = \"satori\" if name: pass if bool(name): pass 这两个 if 判断有啥区别呢？首先 if bool(name) 我们已经分析过了，它会执行 bool_new 函数，将参数解析出来，接着再调用 PyObject_IsTrue，最后得到布尔值。 而对于 if name 来说，它会直接调用 PyObject_IsTrue，后续在分析 if 语句的时候会介绍。所以在工作中，我们使用 if name 即可。 当然啦，获取布尔值除了 bool(obj) 之外，还可以使用 not not obj。 name = \"satori\" print(bool(name)) # True\nprint(not not name) # True 这两者又有什么区别呢？首先 bool(name) 在 Python 里面是一个调用，会进行参数解析，拿到对象之后调用 PyObject_IsTrue 判断真假，正常执行的话，会返回 1 或 0。然后基于 1 和 0 创建布尔值，为 1 返回 True，为 0 返回 False。 而 not name 会对应一条 UNARY_NOT 字节码，它内部也会调用 PyObject_IsTrue，如果结果为 1 返回 False，为 0 返回 True，正好是相反的。所以 not not name 则相当于在 not name 的基础上再反过来一次，这样就和 bool(name) 的结果是一致的了。 当然在工作中，使用哪种都可以，看自己喜好。但为了代码的可读性，显式获取布尔值的时候还是建议使用 bool(name)，效率上没太大差别。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的创建","id":"83","title":"布尔值的创建"},"84":{"body":"以上就是布尔值相关的内容。 bool 继承 int，并且布尔值在底层和整数使用同一个结构体，只是 ob_type 不同； 布尔值具备整数的所有特征，可以像整数一样参与各种运算，其中 True 会被解释成 1，False 会被解释成 0； 布尔值有两种，分别是 True 和 False，它们是单例的，判断时应该使用 is，而不是 ==，除非你把 True 和 False 当成整数使用； 在 Python 里面如果要创建布尔值，有三种方式：通过 True 和 False 字面量、调用类型对象 bool、使用 not not； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 小结","id":"84","title":"小结"},"85":{"body":"None 在 Python 里面也是一个对象，用于表示空（值不存在的情况）。比如基于主键从数据库获取记录，如果没有查询到，那么一般会返回 None。另外如果函数没有返回值，那么也会隐式地返回 None，表示返回的是空。 本篇文章就来聊一聊 None 是怎么实现的。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 楔子","id":"85","title":"楔子"},"86":{"body":"和其它对象不同，由于 None 没有额外的实体数据，所以它在底层就是一个 PyObject 结构体实例。因此也能看出，None 的大小为 16 字节。 // Objects/object.c\nPyObject _Py_NoneStruct = { _PyObject_EXTRA_INIT 1, &_PyNone_Type\n}; None 在底层只包含引用计数和类型，然后类型为 _PyNone_Type。由于变量都是 PyObject *，所以和布尔值一样，解释器也提供了相应的宏，从而方便使用。 // Include/object.h\n#define Py_None (&_Py_NoneStruct) 注意：None 是单例的，如果要判断对象是否为空，应该使用 is 关键字。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的底层结构","id":"86","title":"None 的底层结构"},"87":{"body":"说完了 None 本身，再来看看它的类型。 print(type(None)) # <class 'NoneType'> None 的类型是 <class 'NoneType'>，但这个类解释器没有暴露给我们，需要通过 type 去获取。注意：NoneType 无法被继承，当然我们一般也不会去继承它。 class MyType(type(None)): pass\n\"\"\"\nTypeError: type 'NoneType' is not an acceptable base type\n\"\"\" 然后看一下 NoneType 的底层结构，它位于 Objects/object.c 中。 PyTypeObject _PyNone_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"NoneType\", 0, 0, none_dealloc, /*tp_dealloc*/ /*never called*/ 0, /*tp_vectorcall_offset*/ 0, /*tp_getattr*/ 0, /*tp_setattr*/ 0, /*tp_as_async*/ none_repr, /*tp_repr*/ &none_as_number, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ 0, /*tp_hash */ 0, /*tp_call */ 0, /*tp_str */ 0, /*tp_getattro */ 0, /*tp_setattro */ 0, /*tp_as_buffer */ Py_TPFLAGS_DEFAULT, /*tp_flags */ 0, /*tp_doc */ 0, /*tp_traverse */ 0, /*tp_clear */ 0, /*tp_richcompare */ 0, /*tp_weaklistoffset */ 0, /*tp_iter */ 0, /*tp_iternext */ 0, /*tp_methods */ 0, /*tp_members */ 0, /*tp_getset */ 0, /*tp_base */ 0, /*tp_dict */ 0, /*tp_descr_get */ 0, /*tp_descr_set */ 0, /*tp_dictoffset */ 0, /*tp_init */ 0, /*tp_alloc */ none_new, /*tp_new */\n}; NoneType 的类型也是 type，然后它实现了 tp_as_number。 // Objects/object.c\nstatic PyNumberMethods none_as_number = { // ... (inquiry)none_bool, /* nb_bool */ // ...\n} 但是只实现了里面的 nb_bool，用于生成布尔值。 // Objects/object.c\nstatic int\nnone_bool(PyObject *v)\n{ return 0;\n} 函数返回的是 0，因此调用 PyBool_FromLong 的时候，会返回 Py_False。 print(bool(None)) # False\nprint(not not None) # False","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的类型","id":"87","title":"None 的类型"},"88":{"body":"以上我们就简单介绍了 None，当然内容有些过于简单了，因为 None 本身就没多少内容，核心就两点： None 是单例的； 判断的时候使用 is 关键字； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 小结","id":"88","title":"小结"},"89":{"body":"本篇文章来探讨一下切片是如何实现的，因为在操作字符串、元组、列表等数据结构时，我们经常会使用切片截取数据，所以对切片做一个全方位的了解是很有必要的。 data = list(range(10))\nprint(data[1: 8: 3]) # [1, 4, 7] 以上就是基于切片截取数据，在工作中我们会大量使用切片。但你知道吗，其实切片也是一个对象，类型为 slice，下面我们来看一下切片的底层结构。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 楔子","id":"89","title":"楔子"},"9":{"body":"在程序开发中，我们每时每刻都在创建对象，那到底什么是对象呢？ 其实一个对象就是一片被分配的内存空间，空间可以是连续的，也可以是不连续的。然后空间里面存储了指定的数据，并提供了操作数据的一些功能方法。而按照是否可变和内存大小是否固定，我们可以将对象进行如下分类。 可变对象和不可变对象； 定长对象和变长对象； 下面来详细解释一下。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 楔子","id":"9","title":"楔子"},"90":{"body":"切片的类型是 slice，那么根据解释器的 API 命名规则，我们猜测： 切片（slice 对象）在底层对应 PySliceObject 结构体实例； slice 类型本身在底层对应 PySlice_Type； 下面看一下具体实现。 // Include/sliceobject.h\ntypedef struct { PyObject_HEAD PyObject *start, *stop, *step;\n} PySliceObject; 切片是不可变对象，除了对象的公共头部之外，还有三个字段，分别表示切片的起始位置、终止位置、步长。这也意味着创建切片时，可以给 slice 传递三个参数。 # 创建一个切片\ns = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3) 问题来了，切片创建的时候，传递的参数绑定在了哪些属性上呢？前面我们说过，实例对象可以绑定哪些属性，会定义在类型对象的 tp_members 字段中。 我们看到切片拥有三个属性，名称也是 start、stop、step。 s = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3)\nprint(s.start) # 1\nprint(s.stop) # 8\nprint(s.step) # 3 非常简单，你在 Python 里面看到的一切，都能从源码中找到答案。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的底层结构","id":"90","title":"切片的底层结构"},"91":{"body":"切片是内置类型的实例对象，对于这样的对象，有两种创建方式，相信你已经知道我要说什么了。我们在最开始专门用了十篇文章，从宏观的角度介绍了 Python 的对象模型，目的就在于此。 创建内置对象的两种方式： 通过对象的特定类型 API 创建，只适用于内置对象； 通过调用类型对象创建，所有对象都适用； 解释器对内置对象了如指掌，它们对应的结构体在源码中是写死的，直接 sizeof 一下即可知晓要申请多大内存，完全不需要借助类型对象。 data = list(range(10))\n# 通过特定类型 API 创建\nprint(data[1: 8: 3]) # [1，4，7]\n# 通过调用类型对象创建\nprint(data[slice(1, 8, 3)]) # [1，4，7] 解释器看到 data[1: 8: 3] 就知道要创建一个切片，并且是在数据截取的过程中创建的，我们不能单独写一个 1: 8: 3，这是不符合语法规则的。如果真的想单独创建一个切片，那么需要通过 slice(1, 8, 3) 的方式。 下面通过源码，看一下底层的创建过程。 // Objects/sliceobject.c\nstatic PyObject *\nslice_new(PyTypeObject *type, PyObject *args, PyObject *kw)\n{ PyObject *start, *stop, *step; start = stop = step = NULL; // slice 不接收关键字参数，因此 kw 要指向空字典 if (!_PyArg_NoKeywords(\"slice\", kw)) return NULL; // slice 接收 1 ~ 3 个位置参数，因此 args 指向的元组必须包含 1 ~ 3 个元素 // 然后解析 args，将内部的元素分别赋值给 start、stop、step if (!PyArg_UnpackTuple(args, \"slice\", 1, 3, &start, &stop, &step)) return NULL; // 如果 stop == NULL，说明只传递了一个参数，按照顺序这个参数会赋值给 start // 但很明显，如果只有一个参数，那么这个参数应该交给 stop 保存 // 于是让 stop = start，并让 start = NULL，至于这么做的原因可以想象一下 range // 如果是 range(0, 9)，那么起始位置和终止位置就是 0 和 9 // 但如果是 range(9)，那么这个 9 就是终止位置 if (stop == NULL) { stop = start; start = NULL; } // 假设传了一个参数 8，那么这里就是 PySlice_New(NULL, 8, NULL) // 假设传了两个参数 1、8，那么这里就是 PySlice_New(1, 8, NULL) // 假设传了三个参数 1、8、3，那么这里就是 PySlice_New(1, 8, 3) return PySlice_New(start, stop, step);\n} // 切片缓存，注：slice_cache 只能缓存一个切片\nstatic PySliceObject *slice_cache = NULL; PyObject *\nPySlice_New(PyObject *start, PyObject *stop, PyObject *step)\n{ PySliceObject *obj; // 如果 slice_cache 不为 NULL，证明缓存了切片，那么赋值给 obj // 由于 slice_cache 只能缓存一个切片，那么赋值给 obj 之后，自身要重置为 NULL if (slice_cache != NULL) { obj = slice_cache; slice_cache = NULL; _Py_NewReference((PyObject *)obj); } else { // 否则调用 PyObject_GC_New 为 PySliceObject 实例申请内存 obj = PyObject_GC_New(PySliceObject, &PySlice_Type); if (obj == NULL) return NULL; } // 如果 start、stop、step 是 NULL，那么转成 Python 的 None if (step == NULL) step = Py_None; Py_INCREF(step); if (start == NULL) start = Py_None; Py_INCREF(start); if (stop == NULL) stop = Py_None; Py_INCREF(stop); // 设置切片的 start、stop、step 属性 obj->step = step; obj->start = start; obj->stop = stop; // 接收 GC 跟踪（在之后的篇章中会解释） _PyObject_GC_TRACK(obj); // 转成泛型指针之后返回 return (PyObject *) obj;\n} 以上就是切片的创建过程，非常简单，我们用 Python 代码演示一遍。 print(slice(8)) # slice(None, 8, None)\nprint(slice(1, 8)) # slice(1, 8, None)\nprint(slice(1, 8, 3)) # slice(1, 8, 3) 结果和源码是一致的。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片是怎么创建的","id":"91","title":"切片是怎么创建的"},"92":{"body":"从源码中可以看到，切片是有缓存的。 static PySliceObject *slice_cache = NULL; 这个字段用于缓存被回收的切片，并且从切片的创建过程可以看出只会缓存一个，而不是像浮点数那样以链表的形式缓存多个。之所以这么做，是因为在大部分情况下，切片用完之后会立即销毁。 data = list(range(10))\n# 创建一个切片，截取完数据之后就销毁\nprint(data[0: 3]) # [0, 1, 2]\n# 创建一个切片，截取完数据之后就销毁\nprint(data[2: 7]) # [2, 3, 4, 5, 6] 像 data[start: stop: step] 这种形式，当数据截取完毕之后，创建的切片会立即回收，所以对于解释器来说，它只需要缓存一个切片即可。因此你可以认为同一时刻只会存在一个有效切片，那什么时候会存在多个呢？ data = list(range(10))\ns1 = slice(0, 3)\ns2 = slice(2, 7)\nprint(data[s1]) # [0, 1, 2]\nprint(data[s2]) # [2, 3, 4, 5, 6] 在这种情况下，会同时存在多个有效切片，比如 s1 和 s2 都指向了有效的切片。但很明显，我们在工作中不会这么做，而是在截取数据时，让解释器通过切片的特定类型 API 自动创建。 下面我们来打印切片的地址，看看切片是否被缓存起来了。 # 创建一个切片，缓存如果存在，从缓存获取，否则创建新的切片\n>>> s1 = slice(0, 3)\n>>> id(s1)\n140190801666944 # 创建切片，因为 s1 和 s2 是两个独立的切片，所以它们的地址是不一样的\n>>> s2 = slice(2, 7)\n>>> id(s2)\n140190800965120 # 删除 s1，那么它指向的切片会被放到缓存中\n>>> del s1 # 创建新的切片，使用缓存，显然它的地址和之前 s1 指向的切片的地址是一样的\n>>> s3 = slice(1, 5)\n>>> id(s3)\n140190801666944 # 由于缓存为空，那么删除 s2，它指向的切片会被放入缓存\n>>> del s2 # 创建新的切片，显然它的地址和之前 s2 指向的切片的地址是一样的\n>>> s4 = slice(1, 6)\n>>> id(s4)\n140190800965120 打印结果表明，切片是会被缓存的，但我们怎么证明切片只会缓存一个呢？这个直接看源码即可，根据之前的经验，对象被放入缓存这一步一定发生在对象被销毁的时候，所以我们只需要看切片的销毁过程即可。 对象被销毁时，会调用类型对象的 tp_dealloc，也就是析构函数。 类型对象的 tp_basicsize 保存了实例对象的基础大小，对于切片而言就是 sizeof(PySliceObject)，然后切片又是定长对象，因此 tp_itemsize 是 0。所以切片的大小是固定的，PyObject 占 16 字节，start、end、step 各占 8 字节，总共 40 字节，因此任何一个切片的大小都是固定的 40 字节。 而这个大小即使不借助类型对象也可以计算出来，因为内置对象的定义都是写死的，解释器对它们了如指掌。 为了唤醒大家的记忆，加深理解，以前的内容会时不时回顾一下。我们继续看切片的销毁，对应的析构函数是 slice_dealloc。 // Objects/sliceobject.c\nstatic void\nslice_dealloc(PySliceObject *r)\n{ // 取消 GC 跟踪，相关内容后续介绍 _PyObject_GC_UNTRACK(r); // 切片销毁时，减少 start、stop、step 指向对象的引用计数 Py_DECREF(r->step); Py_DECREF(r->start); Py_DECREF(r->stop); // 关键来了，如果 slice_cache 为 NULL，证明没有缓存 // 那么让 slice_cache 保存销毁的切片的指针，而切片的内存不释放 // 这样下一次创建切片时就不需要申请内存了，直接使用缓存即可 // 因为没有申请内存，只是初始化了 start、stop、step 三个字段，所以效率会更高 if (slice_cache == NULL) slice_cache = r; // 否则释放切片所占的内存 else PyObject_GC_Del(r);\n} 从源码中可以看到，如果 slice_cache 不为空，说明已经缓存了一个切片，if 条件不成立，于是会选择释放内存，所以切片只会缓存一个。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的缓存","id":"92","title":"切片的缓存"},"93":{"body":"切片接收 1 到 3 个元素，但我们可能只传一个，那么剩余的属性是怎么初始化的呢？举个例子： >>> data = list(range(10))\n>>> data[: 5]\n[0, 1, 2, 3, 4]\n>>> data[1:]\n[1, 2, 3, 4, 5, 6, 7, 8, 9]\n>>> data[1:: 2]\n[1, 3, 5, 7, 9]\n>>> data[:: 2]\n[0, 2, 4, 6, 8]\n>>> data[:]\n[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 这些切片都是合法的，当参数不足时，它们的 start、end、step 是怎么设置的呢？ // Objects/sliceobject.c // 该函数接收指向切片的指针，以及三个整型指针\n// 会将切片的起始位置、终止位置、步长解析出来，赋值给 *start、*stop、*step\n// 所以该函数会在其它函数的内部被调用，先声明 Py_ssize_t start, stop, step\n// 然后将切片指针、&start、&stop、&end 传递给 PySlice_Unpack 进行调用\n// 当该函数执行完毕时，外部就拿到了切片的起始位置、终止位置以及步长\nint\nPySlice_Unpack(PyObject *_r, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)\n{ // 将 PyObject * 转成 PySliceObject * PySliceObject *r = (PySliceObject*)_r; Py_BUILD_ASSERT(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX); // 判断步长，如果解析出的步长为空，那么将 *step 赋值为 1 // 所以当不指定步长时，步长会被设置为 1，因此 data[::] 等价于 data[:: 1] if (r->step == Py_None) { *step = 1; } else { // 如果步长不为空，那么它应该是整数，或者是实现了 __index__ 的类的实例对象 // 但如果步长的类型不合法，那么 _PyEval_SliceIndex 里面会设置异常 // 合法的话，会将 r->step 赋值给 *step if (!_PyEval_SliceIndex(r->step, step)) return -1; // 步长不能为 0，否则设置 ValueError(\"slice step cannot be zero\") if (*step == 0) { PyErr_SetString(PyExc_ValueError, \"slice step cannot be zero\"); return -1; } // 如果步长小于 -PY_SSIZE_T_MAX，那么设置为 -PY_SSIZE_T_MAX // 显然这一步基本不会发生 if (*step < -PY_SSIZE_T_MAX) *step = -PY_SSIZE_T_MAX; } // 检测起始位置，如果为 None // 当步长大于 0 时，将 *start 设置为 0 // 当步长小于 0 时，将 *start 设置为 int64 最大值，这背后的原理一会儿解释 if (r->start == Py_None) { *start = *step < 0 ? PY_SSIZE_T_MAX : 0; } // 说明起始位置不为 None else { // 如果起始位置的类型不合法，那么设置异常，直接返回，否则赋值给 *start if (!_PyEval_SliceIndex(r->start, start)) return -1; } // 如果终止位置为 None // 当步长大于 0 时，将 *stop 设置为 PY_SSIZE_T_MAX，即 int64 最大值 // 当步长小于 0 时，将 *stop 设置为 PY_SSIZE_T_MIN，即 int64 最小值 if (r->stop == Py_None) { *stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX; } // 说明终止位置不为 None else { // 如果终止位置不合法，那么设置异常，直接返回，否则赋值给 *stop if (!_PyEval_SliceIndex(r->stop, stop)) return -1; } return 0;\n} 代码逻辑有一些绕，虽然我们知道它在做什么，但问题是这么做的意义是什么呢？在解释之前，我们先用 Python 代码将该函数所做的事情再描述一遍，这样更容易理解。 PY_SSIZE_T_MAX = 2 ** 63 - 1\nPY_SSIZE_T_MIN = -2 ** 63 # 如果切片同时包含起始位置、终止位置、步长，会直接赋值给 start、end、step\n# 这种情况最简单，就不赘述了，我们来讨论未被同时指定的情况 # 步长为空，比如 data[1: 8]\nstart = 1\nend = 8\nstep = 1 # 起始位置为空，步长大于 0，比如 data[: 8]\nstart = 0\nend = 8\nstep = 1\n# 起始位置为空，步长小于 0，比如 data[: 8: -1]\nstart = PY_SSIZE_T_MAX\nend = 8\nstep = -1 # 终止位置为空，步长大于 0，比如 data[2:]\nstart = 2\nend = PY_SSIZE_T_MAX\nstep = 1\n# 终止位置为空，步长小于 0，比如 data[2:: -1]\nstart = 2\nend = PY_SSIZE_T_MIN\nstep = -1 # 起始位置、终止位置均为空，步长大于 0，比如 data[::]\nstart = 0\nend = PY_SSIZE_T_MAX\nstep = 1\n# 起始位置、终止位置均为空，步长小于 0，比如 data[:: -1]\nstart = PY_SSIZE_T_MAX\nend = PY_SSIZE_T_MIN\nstep = -1 下面来分析一下它为什么要这么做，首先我们要知道，所谓的切片截取数据，本质上就是一层 for 循环。 def slice_data(data: list, start: int, end: int, step: int) -> list: ret_data = [] assert step != 0 if step > 0: while start < end and start < len(data): ret_data.append(data[start]) start += step else: while start > end and start >= 0: ret_data.append(data[start]) start -= step * -1 return ret_data data = list(range(0, 10))\nprint(data[: 5])\nprint(slice_data(data, 0, 5, 1))\n\"\"\"\n[0, 1, 2, 3, 4]\n[0, 1, 2, 3, 4]\n\"\"\"\nprint(data[8: 3: -1])\nprint(slice_data(data, 8, 3, -1))\n\"\"\"\n[8, 7, 6, 5, 4]\n[8, 7, 6, 5, 4]\n\"\"\" 所以当步长大于 0 时，从左往右遍历，当步长小于 0 时，从右往左遍历。最后我们再画两张图，看完之后你就彻底理解了。 当步长大于 0 时： 步长大于 0 时，从左往右遍历。 如果 start 未指定，那么设置为 0，表示从头截取，这很好理解，但问题是 end 应该设置为多少。由于 PySlice_Unpack 相当于只是做了一步预处理，它并不包含截取的原始数据的信息，所以 end 如果不指定，直接设置为 int64 最大值。 当步长小于 0 时： 当步长小于 0 时，从右往左遍历。 因为不知道截取的原始数据有多长，所以如果 start 未指定，那么设置为 int64 最大值。但不管是从左往右还是从右往左，end 都是不包含的，所以当 end 为空时，不能指定为 0，否则索引为 0 的元素就取不到了。当然也不能设置为 -1，因为 -1 会被当成是合法的负数索引，后续截取数据时会被解释为最后一个元素的索引，所以它被设置成了 int64 最小值。 我们以使用切片截取列表为例，后续介绍列表的时候还会详细说： 代码中的 item 指向切片，截取数据之前要先获取它内部的 start、stop、step 属性，于是创建三个 Py_ssize_t 变量，并将指针作为参数，调用 PySlice_Unpack。当调用结束后，就拿到了切片的起始位置、终止位置、步长。 但还没有结束，我们说 PySlice_Unpack 只是对切片里面的值做了一些预处理，比如当 step 为 1 并且 end 没有指定时，那么 end 会被设置为 PY_SSIZE_T_MAX。 所以它下面又调用了函数 PySlice_AdjustIndices，会将截取的原始数据的长度也传进去，然后对 start、end、step 做进一步处理，所有的序列对象在基于切片截取数据时都会有这两步。我们看一下该函数的逻辑。 // Objects/sliceobject.c\nPy_ssize_t\nPySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)\n{ // 参数 length：截取的原始数据的长度 // 参数 start、stop：指向起始位置和终止位置的指针 // 参数 step：步长 assert(step != 0); assert(step >= -PY_SSIZE_T_MAX); // 如果起始位置小于 0 if (*start < 0) { // 那么加上长度，得到正数索引，因为负数索引就是个语法糖 *start += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *start < 0 时， 直接将 *start 设置为 0，最终会从第一个元素开始往后遍历 如果 step < 0，表示从后往前遍历，因此当 *start < 0 时， 显然遍历不到任何元素，因为索引是大于 0 的，所以直接将 *start 设置为 -1 */ if (*start < 0) { *start = (step < 0) ? -1 : 0; } } // 如果起始位置大于等于长度，继续判断步长 else if (*start >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *start >= length 时， 显然遍历不到任何元素，因为最大索引为 length - 1 所以直接将 *start 设置为 length 如果 step < 0，表示从后往前遍历，因此当 *start >= length 时， 直接将 *start 设置为 length - 1，最终会从最后一个元素往前遍历 */ *start = (step < 0) ? length - 1 : length; } // 如果终止位置小于 0 if (*stop < 0) { // 那么加上长度，得到正数索引 *stop += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *stop < 0 时， 显然遍历不到任何元素，因此直接将 *stop 设置为 0 如果 step < 0，表示从后往前遍历，因此当 *stop < 0 时， 直接将 *stop 设置为 -1，最终会从后往前遍历到头 */ if (*stop < 0) { *stop = (step < 0) ? -1 : 0; } } // 如果终止位置大于等于长度，继续判断步长 else if (*stop >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *stop >= length 时， 直接设置为 length，会从 start 往后遍历到头 如果 step < 0，表示从后往前遍历，因此当 *stop >= length 时， 此时遍历不到任何元素，直接设置为 length - 1 */ *stop = (step < 0) ? length - 1 : length; } // 到这里 *start、*stop 就已经转换好了 // 或者说 PY_SSIZE_T_MIN、PY_SSIZE_T_MAX 已经基于 length 被替换掉了 // 然后计算 *start 和 *stop 之间的距离，也就是应该要遍历多少个元素 if (step < 0) { if (*stop < *start) { return (*start - *stop - 1) / (-step) + 1; } } else { if (*start < *stop) { return (*stop - *start - 1) / step + 1; } } // 如果不符合条件的话，比如像 data[3: 8: -1]，显然遍历不到任何元素 // 那么直接返回 0 return 0;\n} 可以看到，哪有什么岁月静好，我们之所以能够通过各种姿势使用切片，全靠解释器在替我们负重前行，它在背后做了非常多的工作。正如前面提到的，C 是一门很单纯的语言，Python 的花里胡哨的操作回归到 C 里面，就是普通的 if else 以及 while、for。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片属性的初始化","id":"93","title":"切片属性的初始化"},"94":{"body":"以上我们就介绍了切片的底层结构，切片也是一个对象，拥有自己的缓存。并且 Python 针对切片提供的语法也非常丰富： data[:: 1]，从左往右遍历，或者说从前往后遍历； data[:: -1]，从右往左遍历； data[:: 2]，只筛选索引为偶数的元素； 起始位置和终止位置可以为负数，会自动转成正数； 所以切片用起来很方便，但要明白这背后都是因为解释器做了大量的工作。当然大部分情况下我们使用切片都是无感知的，一般不会刻意地想着要去创建一个切片，只是字符串、列表、元组等数据都支持通过切片截取数据，所以切片还是值得我们深入了解一下的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 小结","id":"94","title":"小结"},"95":{"body":"本篇文章来聊一聊 bytes 对象，也就是字节串，而说到字节串就不得不提字符串。 字符串是由任意数量的字符组成的序列，用于表示文本数据。在大多数编程语言中，字符串被视为一种高层数据类型，能够处理和操作文本信息。 字节串是由任意数量的字节组成的序列，用于表示二进制数据。 字符串具有特定的字符编码，比如 UTF-8、ASCII 等等，这些编码定义了字符如何在内存中表示。而字节串没有预定义的编码，它只是原始的二进制序列，在处理非文本数据时非常有用。 计算机在存储数据以及通过网络传输数据时，数据格式都是二进制字节串，所以如果你想传输一段文本，那么必须先将它转成字节串。 name = \"古明地觉\" print(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\"\nprint(name.encode(\"utf-16\"))\n\"\"\"\nb'\\xff\\xfe\\xe4S\\x0ef0W\\xc9\\x89'\n\"\"\"\nprint(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\" 字节串传输之后还需要转成文本数据，这个过程叫做反序列化。但由于字节串不保存编码信息，它只是一坨字节流，因此反序列化时还需要知道指定的编码，如果编码指定错误，那么反序列化会失败。 # name_utf8 和 name_gbk 都只是普通的字节串\nname_utf8 = b'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\nname_gbk = b'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5' # 如果反序列化，必须要知道原始文本使用的编码是什么\nprint(name_utf8.decode(\"utf-8\"))\nprint(name_gbk.decode(\"gbk\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 如果指定了错误的编码，那么反序列化会失败\ntry: name_utf8.decode(\"gbk\")\nexcept UnicodeDecodeError as e: print(e)\n\"\"\"\n'gbk' codec can't decode byte 0xa7 in position 10: illegal multibyte sequence\n\"\"\" 另外我们看到字符串只有 4 个字符，但序列化之后的字节串却明显多于 4 个字节。这是因为一个字节最多能表示 256 个字符，对于英文字符来说已经足够了，但对于非英文字符则力不从心，毕竟光普通的中文字符就好几千个。 所以便有了多字节编码，它使用多个字节来表示一个字符，具体使用多少个，则取决于编码。如果是 GBK 编码，那么两个字节表示一个字符，如果是 UTF-8 编码，那么三个字节表示一个字符，当然这里的字符指的是非英文字符。所以在反序列化的时候，需要指定正确的编码，否则解析一定会失败。 以上就是关于 bytes 对象的一些基础概念，下面来看一下它的底层结构。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 楔子","id":"95","title":"楔子"},"96":{"body":"字节串的类型是 bytes，那么我们有理由相信它在底层由 PyBytesObject 结构体表示。 // Include/bytesobject.h\ntypedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 我们看一下里面的字段： PyObject_VAR_HEAD：变长对象的公共头部，因为字节串是由若干个字节组成的，具有长度的概念，所以它是变长对象。 ob_shash：保存字节串的哈希值，因为计算哈希值需要遍历所有的字节，如果每获取一次哈希值都要重新计算的话，性能会有影响。所以第一次计算之后会用 ob_shash 字段保存起来，之后就不再计算了。如果 bytes 对象的哈希值尚未计算，那么 ob_shash 为 -1。 ob_sval：char 类型的数组，负责保存具体的字节。这个和整数的 ob_digit 字段的声明方式类似，由于数组长度不属于类型的一部分，因此虽然声明的时候长度是 1，但其实长度不受限制，具体是多少取决于 bytes 对象的字节数量。 我们创建几个不同的 bytes 对象，然后通过画图感受一下。 val = b\"\" 我们看到即便是空的字节序列，底层的 ob_sval 也需要一个 '\\0'，那么这个结构体实例占多大内存呢？首先 ob_sval 之外的四个成员，每个都占 8 字节，而 ob_sval 是一个 char 类型的数组，一个 char 占 1 字节，所以 bytes 对象的内存大小等于 32 + ob_sval 的长度。 而 ob_sval 里面至少有一个 '\\0'，因此一个空的字节序列需要占 33 字节的内存。 >>> sys.getsizeof(b\"\")\n33 注意：ob_size 统计的是 ob_sval 中有效字节的个数，不包括 '\\0'，但是计算占用内存的时候，显然是需要考虑在内的，因为它确实占用了一个字节的空间。因此我们说 bytes 对象占的内存等于 33 + ob_size 也是可以的。 val = b\"abc\" 显然内存大小等于 32 + 4 = 36 字节。 因此 bytes 对象的底层结构还是很好理解的，因为它是字节序列，所以在底层用一个 char 类型的数组来维护具体的值再合适不过了。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 字节串的底层结构","id":"96","title":"字节串的底层结构"},"97":{"body":"下面来看一下 bytes 对象的创建方式，这里我们暂时先不介绍底层是如何创建的，等到介绍缓存池的时候再说。这里来聊一聊如何在 Python 中创建，虽然该系列是剖析源码，但是光说底层的话可能会有一些无趣，因此这个过程中也会穿插大量的 Python 内容。 先观察 Python 代码执行时的表现，再通过底层的源码进行解析，两者结合起来更容易让人理解。另外该系列也能保证即使你没有相应的 C 语言基础，也一样能收获很多。 b = b\"hello\" 以上是最简单的创建方式，它使用我们之前说的特定类型 API，但通过这种方式创建的字节串只能包含 ASCII 字符。下面这种方式是不行的： b = b\"古明地觉\" \"古明地觉\" 包含非 ASCII 字符，所以采用多字节编码，但编码方式也有多种，比如 UTF-8、GBK 等等，解释器不知道你用的是哪一种。因此采用字面量的方式，只能包含 ASCII 字符，因为对于 ASCII 字符而言，不管使用哪种编码，得到的结果都是一样的。但如果包含非 ASCII 字符，那么必须手动指定编码。 b = bytes(\"古明地觉\", encoding=\"utf-8\")\nprint(b)\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 里面的 \\x 表示十六进制，我们知道字符 a 的 ASCII 码是 97，对应十六进制是 61。同理字符 b 是 62，字符 c 是 63，那么 b\"abc\" 就还可以这么创建。 b = b\"\\x61\\x62\\x63\"\nprint(b)\n\"\"\"\nb'abc'\n\"\"\" 以上是根据十六进制的数字创建 bytes 对象，注意：采用这种方式创建必须指定 \\x，然后 b\"\\x61\" 表示的是 1 个字节，并且该字节对应的 ASCII 码的十六进制是 61，也就是字符 a。而 b\"61\" 表示的是两个字节。 # \\x61、\\x62、\\x63 均表示 1 字节\nprint(b\"\\x61\\x62\\x63\")\n\"\"\"\nb'abc'\n\"\"\"\n# 下面这个创建的 bytes 对象是 6 字节\nprint(b\"616263\")\n\"\"\"\nb'616263'\n\"\"\" 可如果有一串字符也是十六进制格式，但开头没有 \\x，这个时候要怎么转成 bytes 对象呢？很简单，使用 bytes.fromhex 方法即可。 print(bytes.fromhex(\"616263\"))\n\"\"\"\nb'abc'\n\"\"\" # 转成 bytes 对象之后，如果是可打印字符的话\n# 那么会显示对应的字符，比如 abc\n# 如果是不可打印字符，就原本输出，比如 \\xff\nprint(bytes.fromhex(\"616263FF\"))\n\"\"\"\nb'abc\\xff'\n\"\"\" 该方法会将里面的字符串当成十六进制来解析，得到 bytes 对象。并且使用这种方式的话，字符的个数一定是偶数，每个字符的范围均是 0~9、A~F（或者 a~f）。因为十六进制需要两个字符来表示，范围是 00 到 FF。即便小于 16，也必须用两个字符表示，比如我们可以写 05，但绝不能只写个 5。 总之使用 bytes.fromhex 创建时，字符串的长度一定是一个偶数，从前往后每两个分为一组。使用字面量的方式创建时也是如此，比如我们可以写成 b\"\\x01\\x02\"，但不能写成 b\"\\x1\\x2\"。 # 不可以写成 b\"\\x0\"，会报错\nprint(b\"\\x00\") # b'\\x00' # \\x 后面至少跟两个字符，但这里跟了 3 个字符\n# 所以 \\x 会和 61 组合得到 'a'\n# 至于后面的那个 1 就单纯的表示字符 '1'\nprint(b\"\\x611\") # b'a1' 所以 \\x 后面可以跟超过两个以上的字符，超过两个以上的部分会被当成普通字符来处理，与十六进制无关。每个 \\x 只和它后面的两个字符结合，因此 \\x 后面不能少于两个字符。 然后我们通过索引获取的时候，得到的也是一个整数： b = \"古\".encode(\"utf-8\")\nprint(b) # b'\\xe5\\x8f\\xa4'\nprint([b[0], b[1], b[2]]) # [229, 143, 164] 所以 bytes 对象的每个字节都是 0 ~ 255 之间的一个整数，那么问题来了，如果我有每个字节对应的整数，那么如何再转成 bytes 对象呢？ # 里面的每个整数都必须位于 0 ~ 255 之间\nprint(bytes([229, 143, 164]))\nprint(bytes([229, 143, 164, 97, 98, 99]))\n\"\"\"\nb'\\xe5\\x8f\\xa4'\nb'\\xe5\\x8f\\xa4abc'\n\"\"\" print(bytes([229, 143, 164]).decode(\"utf-8\"))\nprint(bytes([229, 143, 164, 97, 98, 99]).decode(\"utf-8\"))\n\"\"\"\n古\n古abc\n\"\"\" 以上就是 bytes 对象的几种创建方式，我们再总结一下。 # 1）通过字面量的方式创建\nprint(b\"hello\") # b'hello'\n# 也可以使用十六进制的 ASCII 码，但要指定 \\x 前缀\n# \\x 会和它后面的两个数字（范围是 0 ~ 9、A ~ F）进行组合，表示一个字符\nprint(b\"\\x61\\x62\\x63\") # b'abc'\n# 除了十六进制之外，还可以使用八进制的 ASCII 码，前缀是 \\\n# \\ 会和它后面的三个数字（范围是 0 ~ 7）进行组合，表示一个字符\n# 97、98、99 对应的八进制为 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Python 编写，然后放在 Lib 目录下面。 Modules 目录 Python 的内置库，这些库都是用 C 编写的，编译之后会内嵌在解释器里面。我们举个例子： import random, _random\nimport re, _sre\nimport io, _io\nimport ast, _ast 以 random 为例，它是用来生成随机数的，和性能密切相关。所以它的核心功能由 C 编写，编译之后内嵌在解释器里，模块名为 _random。只不过 Python 又封装了一个 random，在内部会导入 _random，像 re 和 _sre、asyncio 和 _asyncio 都是类似的关系。 Modules 目录里面实现了大量和性能相关的模块，比如 sys、time、gc 等等，我们后续再聊。 Objects 目录 包含 Python 内置数据结构的底层实现，像字典、列表、元组、函数等，底层实现都定义在 Objects 目录中。 Parser 目录 负责 Python 代码的编译，虽然 Python 是解释型语言，但也是要经过编译的。编译的结果为 PyCodeObject 对象，它里面包含了要执行的字节码，编译完之后会交给虚拟机执行。 所以 Python 解释器 = Python 编译器 + Python 虚拟机。 Python 目录 Python 虚拟机的具体实现，字节码的执行、执行环境的管理等都在里面。 Mac 目录 用于 Mac OS X 平台的特定工具和脚本。 Misc 目录 包含各种杂项文件，如配置脚本、工具等。 PC 目录 专为 Windows 平台编写的配置文件和特定扩展。 PCbuild 目录 用于在 Windows 上编译 Python 的项目文件。 Programs 目录 包含 Python 其它可执行文件（如 IDLE）的源代码。 Tools 目录 包含用 Python 编写的各种脚本和工具，帮助开发和维护 Python。 以上就是 CPython 的源码结构，对它有一个基本的认识有助于我们后续的源码学习。","breadcrumbs":"1. CPython 源码长什么样子？ » CPython 源码结构","id":"1","title":"CPython 源码结构"},"10":{"body":"不可变对象一旦创建，其内存中存储的值就不可以再修改了。如果想修改，只能创建一个新的对象，然后让变量指向新的对象，所以前后的地址会发生改变。而可变对象在创建之后，其存储的值可以动态修改。 像整数就是一个不可变对象。 >>> a = 666\n>>> id(a)\n140176818069136\n>>> a += 1\n>>> id(a)\n140176818068368 我们看到执行 a += 1 操作之后，前后地址发生了变化，所以整数不支持本地修改，因此是一个不可变对象； 原来 a = 666，而我们说操作一个变量等于操作这个变量指向的内存，所以 a += 1 会将 a 指向的整数对象 666 和 1 进行加法运算，得到 667。因此会开辟新的空间来存储 667，然后让 a 指向这片新的空间。至于原来的 666 所占的空间怎么办，解释器会看它的引用计数，如果不为 0 代表还有变量引用（指向）它，如果为 0 则证明没有变量引用了，所以会被回收。 关于引用计数，我们后面会详细说，目前只需要知道，如果对象被变量引用了，那么该对象的引用计数就会加 1。有几个变量引用，那么它的引用计数就是几。 除了整数之外，浮点数、字符串、布尔值等等，都是不可变对象，它们的值不能本地修改。 然后是可变对象，像列表、字典、集合等都是可变对象，它们支持动态修改。 这里先多提一句，Python 对象本质上就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。Python 的任何对象在 C 中都会对应一个结构体，这个结构体除了存放具体的值之外，还存放了一些额外信息，具体细节在后续剖析内置对象的时候会细说。 在上一篇文章中我们说到，列表、元组、集合这些容器的内部存储的不是具体的对象，而是对象的指针。比如：lst = [1, 2, 3]，你以为列表存储的是三个整数对象吗？其实不是的，它存储的是三个整数对象的指针，当我们获取 lst[0] 的时候，拿到的是一个指针，但是操作（比如 print）的时候会自动操作指针指向的内存。 因为 Python 底层是用 C 实现的，所以列表的实现必然要借助 C 的数组。可 C 数组里面的元素的类型是一致的，但列表却可以存放任意的元素，因此从这个角度上讲，列表里面的元素就不可能是对象，因为不同的对象在底层对应的结构体是不同的，所以元素只能是指针。 可能有人又好奇了，不同对象的指针也是不同的啊，是的，但 C 指针是可以转化的。Python 底层将所有对象的指针，都转成了 PyObject 类型的指针，这样不就是同一种类型的指针了吗？关于这个 PyObject，它是我们后面要剖析的重中之重，贯穿了整个系列。不过目前只需要知道列表（还有其它容器）存储的元素、以及 Python 的变量，它们都是一个泛型指针 PyObject *。 >>> lst = [1, 2, 3]\n>>> id(lst)\n140176818170432\n>>> lst.append(4)\n>>> lst.append(5)\n>>> lst\n[1, 2, 3, 4, 5]\n>>> id(lst)\n140176818170432 我们看到列表在添加元素的时候，前后地址并没有改变。列表在 C 中是通过 PyListObject 结构体实现的，我们在介绍列表的时候会细说。这个 PyListObject 内部除了一些基本信息之外，还维护了一个 PyObject 的二级指针，指向了 PyObject * 类型的数组的首元素。 显然图中的指针数组用来存储具体的对象的指针，每一个指针都指向了相应的对象（这里是整数对象）。 然后我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了一个二级指针。显然添加、删除、修改元素等操作，都是通过这个二级指针来间接操作指针数组。 因为一个对象一旦被创建（任何语言都是如此），那么它在内存中的大小就不可以变了。所以这就意味着那些可以容纳可变长度数据的可变对象，要在内部维护一个指针，指针指向一片内存区域，该区域存放具体的数据。如果空间不够了，那就申请一片更大的内存区域，然后将元素依次拷贝过去，再让指针指向新的内存区域。而列表的底层也是这么做的，其内部并没有直接存储具体的指针数组，而是存储了指向指针数组首元素的二级指针。 那么问题来了，为什么要这么做？ 其实很好理解，遵循这样的规则可以使通过指针维护对象的工作变得非常简单。一旦允许对象的大小可在运行期改变，那么我们就要考虑如下场景。 在内存中有对象 A，并且其后面紧跟着对象 B。如果在运行的某个时候，A 的大小增大了，这就意味着必须将 A 整个移动到内存中的其他位置，否则 A 增大的部分会覆盖掉原本属于 B 的数据。但要将 A 移动到内存的其他位置，那么所有指向 A 的指针就必须立即得到更新。可想而知这样的工作是多么的繁琐，因此通过在可变对象的内部维护一个指针就变得简单多了。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 可变对象和不可变对象","id":"10","title":"可变对象和不可变对象"},"100":{"body":"根据解释器 API 的命名规则，bytes 类型在底层应该对应 PyBytes_Type。 // Objects/bytesobject.c\nPyTypeObject PyBytes_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bytes\", PyBytesObject_SIZE, sizeof(char), // ... &bytes_as_number, /* tp_as_number */ &bytes_as_sequence, /* tp_as_sequence */ &bytes_as_mapping, /* tp_as_mapping */ // ...\n}; 实例对象的大小信息保存在类型对象中，由 tp_basicsize 和 tp_itemsize 负责维护。 tp_basicsize：实例对象的基本大小，对于 bytes 对象来说就是 PyBytesObject_SIZE。 tp_itemsize：如果实例对象是变长对象，并且结构体本身还保存了具体的元素，那么该字段则表示每个元素的大小，否则为 0。对于 bytes 对象来说就是 sizeof(char)，即 1 字节。 其中 PyBytesObject_SIZE 是一个宏，等于 offsetof(PyBytesObject, ob_sval) + 1，也就是结构体的起始位置到 ob_sval 字段的偏移量再加 1。显然这个大小是固定不变的基础大小，那么它等于多少呢？ typedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 很明显，大小是 32 + 1 = 33 字节，然后再加上 sizeof(char) * ob_size 就是整个 bytes 对象的大小。由于 sizeof(char) 等于 1，所以 bytes 对象的大小等于 PyBytesObject_SIZE 加上 ob_size，我们后面介绍 bytes 对象的创建时会看到。 然后看一下方法簇，我们发现这三个方法簇 bytes 对象居然都支持。 // Objects/bytesobject.c static PyNumberMethods bytes_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ bytes_mod, /*nb_remainder*/\n}; static PySequenceMethods bytes_as_sequence = { // 计算长度，如 len(b\"abc\") (lenfunc)bytes_length, /*sq_length*/ // 将两个 bytes 对象相加 // 比如 b\"abc\" + b\"def\" (binaryfunc)bytes_concat, /*sq_concat*/ // 将 bytes 对象重复 N 次 // 比如 \"abc\" * 3 (ssizeargfunc)bytes_repeat, /*sq_repeat*/ // 基于索引获取 bytes 对象的指定元素 // 比如 b\"abc\"[1] (ssizeargfunc)bytes_item, /*sq_item*/ 0, /*sq_slice*/ 0, /*sq_ass_item*/ 0, /*sq_ass_slice*/ // 判断 bytes 对象是否包含某个元素 (objobjproc)bytes_contains /*sq_contains*/\n}; static PyMappingMethods bytes_as_mapping = { // 获取 bytes 对象的长度 (lenfunc)bytes_length, // 基于切片截取 bytes 对象 (binaryfunc)bytes_subscript, 0,\n}; 对于数值型操作，bytes 对象实现了 nb_remainder，它居然支持求余数，这是怎么回事？好吧，我表现的有些刻意了，其实就是一个字节串的格式化操作。 对于序列型操作，bytes 对象支持五个，从名字上看也知道是做什么的，不过这些我们一会儿都会说。 对于映射型操作，bytes 对象支持两个。虽然 bytes 对象不是字典，但解释器允许它做一些类似于映射的操作，这种设计使得 bytes 对象具有更加丰富和灵活的操作接口。 下面我们就来详细介绍这些操作的底层实现，它们都位于 Objects/bytesobject.c 中。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 类型","id":"100","title":"bytes 类型"},"101":{"body":"bytes 对象借用取模运算符 % 实现格式化，它对应 bytes_as_number->nb_remainder 字段，该字段被赋值为 bytes_mod。 static PyObject *\nbytes_mod(PyObject *self, PyObject *arg)\n{ if (!PyBytes_Check(self)) { Py_RETURN_NOTIMPLEMENTED; } // PyBytes_AS_STRING 会返回 PyBytesObject 的 ob_sval 字段 // PyBytes_GET_SIZE 会返回 PyBytesObject 的 ob_size 字段，即长度 // arg 是传递的参数，它是一个元组 return _PyBytes_FormatEx(PyBytes_AS_STRING(self), PyBytes_GET_SIZE(self), arg, 0);\n} 最终会调用 _PyBytes_FormatEx 进行格式化，我们再以 Python 为例。 info = b\"name: %s, age: %d\"\nprint(info % (b\"satori\", 17)) # b'name: satori, age: 17' bytes 对象的格式化，在工作中其实用的不多。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » bytes 对象的格式化","id":"101","title":"bytes 对象的格式化"},"102":{"body":"计算字节串的长度会执行 bytes_as_sequence->sq_length，该字段被赋值为 bytes_length。 static Py_ssize_t\nbytes_length(PyBytesObject *a)\n{ return Py_SIZE(a);\n} Py_SIZE 是一个宏，我们之前说过，它会返回对象的 ob_size。 name = b\"satori\"\n# 直接返回 ob_size\nprint(len(name)) # 6 ob_size 维护了 bytes 对象的有效字节个数，计算长度的时候直接返回。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 计算 bytes 对象的长度","id":"102","title":"计算 bytes 对象的长度"},"103":{"body":"bytes 对象支持乘法操作，可以重复指定次数，举个例子。 word = b\"abc\"\n# 重复 3 次\nprint(word * 3) # b'abcabcabc' 我们看到这里使用了乘法运算符，所以很容易联想到 PyNumberMethods 的 nb_mul，但对于 bytes 对象而言却不是这样，它对应的是 PySequenceMethods 的 sq_repeat。所以 Python 的同一个操作符，在底层会对应不同的函数，比如 long_mul 和 float_mul、以及这里的 bytes_repeat，在 Python 的层面都是 * 这个操作符。 下面我们看一下具体逻辑，它由 bytes_repeat 函数实现。 static PyObject *\nbytes_repeat(PyBytesObject *a, Py_ssize_t n)\n{ Py_ssize_t i; Py_ssize_t j; Py_ssize_t size; // 新创建的 bytes 对象的 ob_size PyBytesObject *op; // 指向新创建的 bytes 对象 size_t nbytes; // 应该为 bytes 对象内部的 char 数组（ob_sval）申请多大内存 // 如果 bytes 对象乘上一个小于 0 的数，那么等价于乘以 0 if (n < 0) n = 0; // Py_SIZE(a) * n 就是新创建的 bytes 对象的长度 // 如果这个长度超过了 PY_SSIZE_T_MAX，那么报错，字节串过长 // 另外注意这里的条件，正常思路是 Py_SIZE(a) * n > PY_SSIZE_T_MAX // 但为了避免 Py_SIZE(a) * n 发生溢出，所以改成了除法 // 这个和我们写二分查找求平均值是一个道理 if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) { PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 将 Py_SIZE(a) * n 赋值给 size size = Py_SIZE(a) * n; // 如果 size 和 Py_SIZE(a) 相等，说明 n 为 1，或者 Py_SIZE(a) 为 0 // 但不管哪一种，都意味着新创建的 bytes 对象和原始的 bytes 对象是相同的 // 既然这样的话，就没必要创建了，直接给原始的 bytes 对象的引用计数加一，然后返回即可 if (size == Py_SIZE(a) && PyBytes_CheckExact(a)) { Py_INCREF(a); return (PyObject *)a; } // 需要为内部的 char 数组申请的内存大小，一个元素一个字节 // 注：严格意义上说，nbytes 应该等于 char 数组的内存大小减 1 // 因为额外存储 '\\0' 所需的一字节被算在了 PyBytesObject_SIZE 里面 // 所以这个 nbytes 的含义其实和 bytes 对象的长度是等价的 nbytes = (size_t)size; // PyBytesObject_SIZE + nbytes 便是 bytes 对象的内存大小了 // 但如果两者相加的结果反而小于等于 nbytes，说明产生溢出了（发生了环绕） if (nbytes + PyBytesObject_SIZE <= nbytes) { // 那么报错，字节串太长了 PyErr_SetString(PyExc_OverflowError, \"repeated bytes are too long\"); return NULL; } // 为新创建的 bytes 对象申请 PyBytesObject_SIZE + nbytes 大小的内存 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + nbytes); // 如果 op 为 NULL，说明内存不足 if (op == NULL) return PyErr_NoMemory(); // 初始化，将 op->ob_type 设置为 &PyBytes_Type，将 op->ob_size 设置为 size (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); // 将 ob_shash 初始化为 -1，等到需要计算的时候，再更新 ob_shash // 一旦更新，后续就不用再计算了，会直接返回 ob_shash op->ob_shash = -1; // ob_sval 要额外存储一个 '\\0'，显然它位于索引为 size 的位置 // 因此有效字符的数量为 size，但 ob_sval 的大小为 size + 1 // 那么问题来了，既然这样的话，nbytes 应该等于 size + 1 才对，为啥等于 size 呢 // 很简单，原因已经说过了，因为 PyBytesObject_SIZE 为 offsetof(PyBytesObject, ob_sval) + 1 // offsetof(PyBytesObject, ob_sval) 表示从结构体起始位置到 ob_sval 的偏移量 // 或者你也可以理解为 ob_sval 之前的所有字段的大小 // 但它又额外加上了 1，所以 '\\0' 需要的空间已经被申请了，因此没有问题 op->ob_sval[size] = '\\0'; // 此时对象的内存就已经申请好了，类型、长度等元数据也设置好了，接下来就是拷贝元素了 // 首先做一个快分支判断，如果原始的 bytes 对象的长度为 1，证明新的 bytes 对象的所有字节都是一样的 // 直接将 op->ob_sval 里面的 n 个元素设置为 a->ob_sval[0] 即可 if (Py_SIZE(a) == 1 && n > 0) { memset(op->ob_sval, a->ob_sval[0] , n); return (PyObject *) op; } // 否则将 a->ob_sval 里面除了 '\\0' 之外的有效字符拷贝到 op->ob_sval 里面 // 每次拷贝 Py_SIZE(a) 个字符，直到拷贝的字符个数达到 size i = 0; if (i < size) { memcpy(op->ob_sval, a->ob_sval, Py_SIZE(a)); i = Py_SIZE(a); } while (i < size) { j = (i <= size-i) ? i : size-i; memcpy(op->ob_sval+i, op->ob_sval, j); i += j; } // 将 PyBytesObject * 类型的 op 转成 PyObject *，然后返回，交给变量保存 return (PyObject *) op;\n} 所以通过观察源码，你会发现 Python 里面的操作并没有什么神奇的，简单思考一下就知道它的底层逻辑。再比如后续介绍的切片截取，即使现在还没看具体源码，但也能猜到底层就是单纯的 for 循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 将 bytes 对象重复 N 次","id":"103","title":"将 bytes 对象重复 N 次"},"104":{"body":"bytes 对象也支持通过索引和切片截取指定部分的元素。 buf = b\"abcde\"\n# 基于索引获取元素，拿到的是整数\nprint(buf[0]) # 97\n# 基于切片获取元素，拿到的依旧是字节串\nprint(buf[0: 1]) # b'a' 那么底层是怎么做的呢？ static PyObject*\nbytes_subscript(PyBytesObject* self, PyObject* item)\n{ // 如果是 buf[0] 这种，那么 self 就是 buf，item 就是 0 // 如果是 buf[0: 3] 这种，那么 self 就是 buf，item 就是 slice(0, 3) // 所以要对 item 进行检测，判断它到底是索引还是切片 if (PyIndex_Check(item)) { // 如果 item 是整数或者实现了 tp_as_number->nb_index // 那么表示索引，会转成 Py_ssize_t，如果转换失败，那么会设置异常回溯栈 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError); // 如果 PyErr_Occurred() 为真，那么表示有异常发生 // 但问题是这里为什么要多一个 i == -1 呢？我们稍后再说 if (i == -1 && PyErr_Occurred()) return NULL; // 如果转换之后发现 i 小于 0，表示使用的是负数索引 // 那么要加上长度，变成正数索引，因此负数索引本质上也是 Python 的一个语法糖 if (i < 0) i += PyBytes_GET_SIZE(self); // 到这里发现 i 如果还小于 0，或者本身大于等于长度，那么索引越界 if (i < 0 || i >= PyBytes_GET_SIZE(self)) { PyErr_SetString(PyExc_IndexError, \"index out of range\"); return NULL; } // 否则说明索引 i 是合法的，那么获取数组 ob_sval 中索引为 i 的元素 // 但拿到的是 C 的整数，所以还要基于 C 整数创建 Python 整数，然后返回 return PyLong_FromLong((unsigned char)self->ob_sval[i]); } // 如果 item 是切片 else if (PySlice_Check(item)) { // 我们知道切片有三个属性，分别是起始位置、终止位置、步长 Py_ssize_t start, stop, step, slicelength, i; size_t cur; char* source_buf; char* result_buf; PyObject* result; // 解析切片，将内部属性赋值给 start、stop、step // 关于 PySlice_Unpack 我们在介绍切片的时候说过 if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 这个函数在介绍切片的时候也说过 // 它会调整 start 和 stop 的值，比如将负数转成正数，然后返回应该遍历的元素个数 slicelength = PySlice_AdjustIndices(PyBytes_GET_SIZE(self), &start, &stop, step); // 如果小于等于 0，说明截取不到任何元素，因此直接返回空字节串 if (slicelength <= 0) { // 基于 C 的字符数组和拷贝的字节数，创建 Python 的字节串 return PyBytes_FromStringAndSize(\"\", 0); } // 如果 start 为 0，step 为 1，并且截取的元素个数和原始字节串的长度相等 // 比如 buf[::] 这种，说明截取之后的字节串和原始字节串相同 // 那么直接给原始字节串增加一个引用计数，然后返回即可 else if (start == 0 && step == 1 && slicelength == PyBytes_GET_SIZE(self) && PyBytes_CheckExact(self)) { Py_INCREF(self); return (PyObject *)self; } // 如果步长为 1，那么从索引为 start 的位置截取 slicelength 个字节即可 // PyBytes_AS_STRING(self) 会返回字节串的 ob_sval，即 C 字符数组 // ob_sval + start 会将指针偏移到索引为 start 的位置 // 然后通过 C 的 memcpy 函数从 start 开始拷贝 slicelength 个字节 else if (step == 1) { return PyBytes_FromStringAndSize( PyBytes_AS_STRING(self) + start, slicelength); } // 否则说明步长不为 1，此时只能使用循环了 else { // 拿到原始字节串的 ob_sval source_buf = PyBytes_AS_STRING(self); // 创建长度为 slicelength 的字节串 // 注意：此时内部字符数组的容量已经有了，但还没有元素 result = PyBytes_FromStringAndSize(NULL, slicelength); if (result == NULL) return NULL; // 拿到新创建的字节串的 ob_sval result_buf = PyBytes_AS_STRING(result); // 从 start 开始遍历，遍历 slicelength 次，指针每次跳 step 个元素 for (cur = start, i = 0; i < slicelength; cur += step, i++) { // 将元素设置进去 result_buf[i] = source_buf[cur]; } // 返回 return result; } } // 如果 item 既不是整数也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"byte indices must be integers or slices, not %.200s\", Py_TYPE(item)->tp_name); return NULL; }\n} 虽然代码有点长，但逻辑一点都不难。还是那句话，对于 C 这样朴素的语言来说，就是 if 判断加循环。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 基于索引和切片获取元素","id":"104","title":"基于索引和切片获取元素"},"105":{"body":"在看 bytes_subscript 源码时，我们提出了一个问题。 上面代码中为什么要有一个 i == -1 判断呢？要解释这一点，首先必须要理解 Python 的异常是怎么抛出来的。 所谓的抛异常，本质上就是底层的某个 C 函数的代码逻辑出现了问题，不能继续执行了，于是将异常信息设置到回溯栈中，并给出一个表示错误的返回值。当解释器发现返回值不对时，就知道程序出错了，于是将回溯栈的异常写入到 stderr（标准错误输出）中。 比如这里，当检测到索引小于 0 或大于等于长度时，就知道索引越界了，不能再执行了。于是会通过 PyErr_SetString 将异常设置到回溯栈中，并返回了 NULL，表示错误的返回值。 因为对于当前函数来说，它的返回值类型是 PyObject *，如果正常执行，那么返回值应该指向一个合法的 PyObject。但当逻辑出现错误时，就意味着函数不能再执行了，于是设置异常并返回 NULL。而解释器在看到返回值为 NULL 时，就知道该函数执行出现错误了，那么会将回溯栈里的异常信息输出到 stderr 中， data = []\n# data[1] 在底层会执行 bytes_subscript(data, 1)\n# 但是发现索引 1 大于等于长度，于是会将异常信息写入到 stderr，并返回 NULL\n# 解释器发现返回的是 NULL，就知道执行出错了，否则返回值一定会指向一个合法的 PyObject\n# 于是解释器会将回溯栈里的异常写入到 stderr，并终止运行（暂时不考虑异常捕获）\nprint(data[1]) 在 Python 中看到的就是下面这个样子。 所以这就是抛异常的本质，如果 C 函数执行逻辑有问题，那么会以异常的形式将信息写入到回溯栈，并给出一个表示错误的返回值。外界发现返回值有问题时，就知道执行出错了，最终会由解释器将回溯栈里的异常写入到 stderr 当中。 既然 C 函数执行出现问题会设置异常，那么判断函数执行是否有问题，除了看它的返回值是否正常之外，还可以通过检测异常回溯栈。如果回溯栈里面有异常，调用 PyErr_Occurred 会返回真，否则返回假。 但 PyErr_Occurred 的效率稍微低一些，而直接判断返回值会更快，因为只是一个比较操作。比如这里的 bytes_subscript 函数，只需要检测它的返回值是否等于 NULL 即可判断函数执行是否出现异常。因为返回值类型是 PyObject *，如果正常执行，返回值一定不是 NULL，否则说明程序出问题了。 但 PyNumber_AsSsize_t 函数则不同，该函数的返回值类型是整型。 索引要么是整数，要么是实现了 __index__ 的类的实例对象，内部调用的 _PyNumber_Index 会统一将 item 转成 Python 整数并返回，如果转换失败则设置异常并返回 NULL。 而 PyNumber_AsSsize_t 函数则负责将 Python 整数转成 C 的 ssize_t 整数，但当它发现返回的 value 没有指向一个合法的 PyObject，而是 NULL，就知道 _PyNumber_Index 执行失败了。那么对于 PyNumber_AsSsize_t 而言，它也不能再执行了，应该返回一个表示错误的返回值。但 PyNumber_AsSsize_t 的返回值类型不是 PyObject *，而是整型，所以它不能返回 NULL。那么返回多少呢？解释器使用 -1 来充当表示错误的哨兵返回值。 但 -1 除了可以表示出现错误，也可能是函数正常执行，而返回值本身就是 -1。所以和指针类型不同，对于指针类型，通过返回值是否为 NULL 即可判断函数是否执行正常，而返回整型则需要借助 PyErr_Occurred。 比如发现 i 不等于 -1，说明 PyNumber_AsSsize_t 执行正常，不用再判断了。如果 i 等于 -1，那么则需要进一步检查异常回溯栈，如果栈不为空，证明确实发生错误了。如果栈为空，证明此时返回的 -1 不是因出现错误而返回的哨兵值，而是函数正常执行、但返回值本身就是 -1。 假设 PyNumber_AsSsize_t 因为索引类型不合法而返回了 -1，那么 bytes_subscript 就知道调用出现了错误，于是也不能再执行了，于是立即返回。由于它的返回值类型是 PyObject *，所以会返回 NULL。而最后当解释器看到 bytes_subscript 返回的是 NULL 时，就知道程序应该报错，于是会将回溯栈里的异常抛出来，并结束进程。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 聊一聊异常","id":"105","title":"聊一聊异常"},"106":{"body":"以上我们就介绍了 bytes 对象（字节串）的一些操作的底层实现，不过还没结束，下一篇文章我们来聊一聊 bytes 对象的加法运算。 当然加法运算本身很简单，之所以单独摘出来是因为背后涉及一个非常重要的概念：缓冲区，它也是 Numpy 得以实现的关键，下一篇文章细聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"24. bytes 对象都支持哪些操作，它们是怎么实现的？ » 小结","id":"106","title":"小结"},"107":{"body":"bytes 对象支持加法运算，将两个 bytes 对象合并为一个，举个例子。 b1 = b\"abc\"\nb2 = b\"def\"\nprint(b1 + b2) # b'abcdef' 这背后是怎么实现的呢？我们通过源码分析一下，并通过 bytes 对象的相加，介绍一下缓冲区的知识。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 楔子","id":"107","title":"楔子"},"108":{"body":"提到加法，很容易联想到 PyNumberMethods 的 nb_add，比如：PyLongObject 的 long_add 和 PyFloatObject 的 float_add。 但对于 bytes 对象而言却不是这样，加法操作对应的是 PySequenceMethods 的 sq_concat。所以我们将加法运算改成合并，会更合适一些，只是它在 Python 层面对应的也是 + 操作符。对于 bytes 对象而言，sq_concat 字段会被赋值为 bytes_concat。 static PyObject *\nbytes_concat(PyObject *a, PyObject *b)\n{ // 两个 Py_buffer 结构体类型的变量，用于维护缓冲区 // 关于缓冲区，我们一会儿说 Py_buffer va, vb; // 相加结果 PyObject *result = NULL; // 此时缓冲区啥也没有，默认将缓冲区的长度初始化为 -1 va.len = -1; vb.len = -1; // 每个 bytes 对象底层都对应一个缓冲区，可以通过 PyObject_GetBuffer 获取 // 这里获取两个 bytes 对象的缓冲区，然后交给变量 va 和 vb // 获取成功返回 0，获取失败返回非 0 // 如果下面的条件不成功，就意味着获取失败了，说明至少有一个老铁不是 bytes 类型 if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 || PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) { // 然后设置异常，PyExc_TypeError 表示 TypeError（类型错误） // 专门用来表示对一个对象执行了它所不支持的操作 PyErr_Format(PyExc_TypeError, \"can't concat %.100s to %.100s\", Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name); // 比如 b\"123\" + 123 就会得到 TypeError: can't concat int to bytes // 和这里设置的异常信息是一样的，然后当出现异常之后，直接跳转到 done 标签 goto done; } // 这里判断是否有一方长度为 0 // 如果 a 的长度为 0，那么相加之后的结果就是 b if (va.len == 0 && PyBytes_CheckExact(b)) { result = b; Py_INCREF(result); goto done; } // 逻辑和上面类似，如果 b 的长度为 0，那么相加之后的结果就是 a if (vb.len == 0 && PyBytes_CheckExact(a)) { result = a; Py_INCREF(result); goto done; } // 判断两个 bytes 对象合并之后，长度是否超过 PY_SSIZE_T_MAX // 所以 bytes 对象是有长度限制的，因为维护长度的 ob_size 有最大范围 // 但还是之前说的，这个条件基本不可能满足，除非你写恶意代码 // 补充一句，这个 if 条件看起来会有些别扭，更直观的写法应该像下面这样 // if (va.len + vb.len > PY_SSIZE_T_MAX)，但 va.len + vb.len 可能会溢出 if (va.len > PY_SSIZE_T_MAX - vb.len) { PyErr_NoMemory(); goto done; } // 否则的话，创建指定容量的 PyBytesObject result = PyBytes_FromStringAndSize(NULL, va.len + vb.len); if (result != NULL) { // PyBytes_AS_STRING 会获取 PyBytesObject 的 ob_sval 字段 // 将缓冲区 va 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 va.len memcpy(PyBytes_AS_STRING(result), va.buf, va.len); // 将缓冲区 vb 里面的内容拷贝到 result->ob_sval 中，拷贝的长度为 vb.len // 但是要从 va.len 的位置开始拷贝，不然会把之前的内容覆盖掉 memcpy(PyBytes_AS_STRING(result) + va.len, vb.buf, vb.len); } done: // 拷贝完之后，将 va 和 vb 里的内容释放掉，否则可能会导致内存泄漏 if (va.len != -1) PyBuffer_Release(&va); if (vb.len != -1) PyBuffer_Release(&vb); return result;\n} 代码虽然有点长，但是不难理解，重点是里面的 Py_buffer。我们以 a = b\"ab\"，b = b\"cde\" 为例，看一下 a + b 是怎么做的？ 说白了整个过程就是将 a->ob_sval 和 b->ob_sval 拷贝到 result->ob_sval 中。但问题是为啥不直接拷贝，而是要搞出来一个 Py_buffer 呢？这就要说一说 Python 的缓冲区了。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » bytes 对象的加法运算","id":"108","title":"bytes 对象的加法运算"},"109":{"body":"为了更好地理解缓冲区，我们需要解释一下什么是缓冲区协议。缓冲区协议是一个 C 级协议，它定义了一个具有数据缓冲区和元数据的 C 级结构体，这个结构体就是上面的 Py_buffer。通过 Py_buffer 来描述缓冲区的布局、数据类型和读写权限，并且还定义了支持协议的对象所必须实现的 API。 实现缓冲区协议的对象有 bytes对象、array.array 对象、以及最知名的 numpy.ndarray 对象。 至于缓冲区本身，它就是一个单纯的一维数组，负责存储具体的数据。我们以 numpy 数组为例，不管数组是多少维的，底层的缓冲区永远是一个一维数组。那么问题来了，我们在定义数组时设置的维度信息要如何体现呢？答案是通过 Py_buffer，来看一下它的底层结构。 // Include/cpython/object.h typedef struct bufferinfo { // 指针，指向具体的缓冲区，注意：缓冲区就是个一维数组 void *buf; // 指向实现缓冲区协议的对象本身 PyObject *obj; // 缓冲区的长度 Py_ssize_t len; // 缓冲区中每个元素的大小 Py_ssize_t itemsize; // 缓冲区是否只读，0 表示可读写、1 表示只读 int readonly; // 维度，比如数组的 shape 为 (3, 4, 5)，那么它的 ndim 就是 3 int ndim; // 格式化字符串，用于描述缓冲区的元素类型 char *format; // 等价于 numpy 数组的 shape // 因此缓冲区永远是个一维数组，由 buf 字段指向 // 而其它字段则负责描述这个一维数组应该怎么使用 Py_ssize_t *shape; // 在某个维度下，从一个元素到下一个元素所需要跳跃的字节数 Py_ssize_t *strides; Py_ssize_t *suboffsets; void *internal;\n} Py_buffer; 以上就是 Py_buffer，它的 buf 字段指向了具体的缓冲区，对于 bytes 对象而言就是内部的 ob_sval 字段。再比如 numpy 数组的拷贝，默认情况下在拷贝数组时只会将 Py_buffer 拷贝一份，而 Py_buffer 内部的 buf 字段指向的缓冲区则不会拷贝。 import numpy as np # Py_buffer.buf 指向了缓冲区\n# Py_buffer.shape 为 (6,)\narr1 = np.array([3, 9, 5, 7, 6, 8])\n# 将 Py_buffer 拷贝一份，并且 Py_buffer.shape 变成了 (2, 3)\n# 但 Py_buffer.buf 指向的缓冲区没有拷贝\narr2 = arr1.reshape((2, 3)) # 然后在通过索引访问的时候，可以认为 numpy 为其创建了虚拟的索引轴\n# 由于 arr1 只有一个维度，那么 numpy 会为其创建一个虚拟的索引轴\n\"\"\"\narr1 = [3 9 5 7 6 8] index1: 0 1 2 3 4 5 buf: 3 9 5 7 6 8 \"\"\"\n# arr2 有两个维度，shape 是 (2, 3)\n# 那么 numpy 会为其创建两个虚拟的索引轴\n\"\"\"\narr2 = [[3, 9, 5] [7, 6, 8]] index1: 0 0 0 1 1 1 index2: 0 1 2 0 1 2 buf: 3 9 5 7 6 8 \"\"\"\n# 缓冲区中索引为 4 的元素被修改\narr2[1, 1] = 666\n# 由于 arr1 和 arr2 共享一个缓冲区\n# 所以 print(arr1[4]) 也会打印 666\nprint(arr1[4]) # 666 以上就是缓冲区的内容，关于缓冲区在后续还会详细介绍，到时候我们也会让自定义的实例对象支持缓冲区。 回到 bytes 对象，它也实现了缓冲区协议，内部的 ob_sval（一个一维数组）就是对应的缓冲区，Py_buffer 里面的 buf 字段同样指向了这个缓冲区，而其它的字段则负责描述该如何使用这个缓冲区，可以理解为元信息。正如 numpy 的数组，虽然多个数组底层共用一个缓冲区，数据也只有一份，但在 numpy 的层面却可以表现出不同的维度，究其原因就是元信息不同。 相信你现在肯定明白 Py_buffer 存在的意义了，就是共享内存。不管什么对象，只要实现了缓冲区协议，那么就可以直接向彼此暴露自身的缓冲区。并且在操作的时候，统一使用 Py_buffer，保证不同类型的对象的操作是一致的。 import numpy as np # bytes 对象实现了缓冲区协议，后续操作时会创建 Py_buffer 实例\n# Py_buffer.buf 指向的缓冲区便是 bytes 对象的 ob_sval\n# 对于当前来说就是 {'a', 'b', 'c', 'd', '\\0'}\nb = b\"abcd\" # np.frombuffer 表示基于已有的缓冲区创建数组，因此会共享 bytes 对象的缓冲区\n# 但问题是缓冲区只是一个普通的一维数组，numpy 该怎么解析这个缓冲区呢\n# 所以我们必须显式地指定 dtype，而 \"S1\" 表示按照单个字节来进行解析\narr1 = np.frombuffer(b, dtype=\"S1\")\nprint(arr1) # [b'a' b'b' b'c' b'd'] # \"S2\" 表示按照两个字节来进行解析\narr2 = np.frombuffer(b, dtype=\"S2\")\nprint(arr2) # [b'ab' b'cd'] # 那么问题来了，按照三个字节解析是否可行呢？\n# 答案是不可行，因为缓冲区的大小不是 3 的整数倍\n# 而 \"S4\" 显然是可以的\narr3 = np.frombuffer(b, dtype=\"S4\")\nprint(arr3) # [b'abcd'] # 按照 int8 进行解析\narr4 = np.frombuffer(b, dtype=\"int8\")\nprint(arr4) # [ 97 98 99 100] # 按照 int16 进行解析\n# 显然 97 98 整体会被解析成一个整数，99 100 整体会被解析成一个整数\n# 你想到了什么，这不就类似于 Python 整数的底层实现嘛\n\"\"\"\n97 -> 01100001\n98 -> 01100010\n那么 97 98 组合起来就是 01100010_01100001 99 -> 01100011\n100 -> 01100100\n那么 99 100 组合起来就是 01100100_01100011\n\"\"\"\nprint(0b01100010_01100001) # 25185\nprint(0b01100100_01100011) # 25699\nprint(np.frombuffer(b, dtype=\"int16\")) # [25185 25699] # 按照 int32 来解析，显然这 4 个字节整体表示一个 int32\nprint(0b01100100_01100011_01100010_01100001) # 1684234849\nprint(np.frombuffer(b, dtype=\"int32\")) # [1684234849] 怎么样，是不是有点神奇呢？相信你在使用 numpy 的时候应该会有更加深刻的认识了，这就是缓冲区协议的威力。哪怕是不同的对象，只要都实现了缓冲区协议，那么彼此之间就可以暴露底层的缓冲区，从而实现共享内存。 所以 np.frombuffer 就是直接根据对象的缓冲区来创建数组，然后它底层的 buf 字段也指向这个缓冲区。但它不知道该如何解析这个缓冲区，所以我们需要显式地指定 dtype 来告诉它，相当于告诉它一些元信息。 那么问题来了，我们能不能修改缓冲区呢？ import numpy as np b = b\"abcd\"\narr = np.frombuffer(b, dtype=\"S1\") try: arr[0] = b\"A\"\nexcept ValueError as e: print(e) # assignment destination is read-only # 答案是不可以的，因为原始的 bytes 对象不可修改，所以缓冲区只读\n# 但我们真的就没办法了吗？还记得之前介绍的骚操作吗？\nfrom ctypes import * class PyBytesObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_shash\", c_ssize_t), (\"ob_sval\", 5 * c_byte), ]\nobj = PyBytesObject.from_address(id(b))\n# 修改缓冲区之前，打印 arr\nprint(arr) # [b'a' b'b' b'c' b'd']\n# 修改缓冲区之后，打印 arr\nobj.ob_sval[0] = ord(\"A\")\nprint(arr) # [b'A' b'b' b'c' b'd'] 我们看到由于共享缓冲区，所以修改 bytes 对象也会影响数组 arr，只是由于 bytes 对象不可变，我们只能出此下策。但其实还有一个办法，就是使用 bytearray 对象。 import numpy as np # 可以理解为可变的 bytes 对象\nb = bytearray(b\"abcd\")\narr = np.frombuffer(b, dtype=\"S1\") print(b) # bytearray(b'abcd')\n# 此时缓冲区是可修改的，并且修改任何一个对象都会影响另一个，因为它们共享同一个缓冲区\narr[0] = b\"A\"\n# 再次打印\nprint(b) # bytearray(b'Abcd') Py_buffer 的实现，也是 numpy 诞生的一个重要原因。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 详解缓冲区","id":"109","title":"详解缓冲区"},"11":{"body":"所谓定长和变长，取决于对象所占的内存大小是否固定，举个例子。 >>> import sys\n>>> sys.getsizeof(\"\")\n49\n>>> sys.getsizeof(\"hello\")\n54\n>>> sys.getsizeof(\"hello world\")\n60 >>> sys.getsizeof(1.0)\n24\n>>> sys.getsizeof(3.14)\n24\n>>> sys.getsizeof((2 << 30) + 3.14)\n24\n>>> 我们看到字符串的长度不同，所占的内存也不同，像这种内存大小不固定的对象，我们称之为变长对象；而浮点数所占的内存都是一样的，像这种内存大小固定的对象，我们称之为定长对象。 至于 Python 如何计算对象所占的内存，我们在剖析具体对象的时候会说，因为这涉及到底层对应的结构体。 所以变长对象的特点是：同一个类型的实例对象，如果值不同，那么占用的内存大小不同。像字符串、列表、元组、字典等，它们毫无疑问都是变长对象。值得一提的是，整数也是变长对象，因为 Python 整数的值在底层是通过数组维护的，后续介绍整数实现的时候再聊。 而定长对象的特点是：同一个类型的实例对象，不管值是多少，占用的内存大小始终是固定的，比如浮点数。因为 Python 的浮点数的值在 C 中是通过一个 double 来维护的。而 C 里面值的类型一旦确定，那么内存大小就不变了，所以 Python 浮点数的内存大小也是不变的。 但既然类型固定，内存大小固定，那么范围肯定是有限的。所以当浮点数不断增大，会牺牲精度来进行存储。 如果实在过大，则抛出 OverFlowError。 当然除了浮点数之外，布尔值、复数等也属于定长对象，它们占用的内存大小是固定的。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 定长对象和变长对象","id":"11","title":"定长对象和变长对象"},"110":{"body":"通过两个 bytes 对象相加，我们了解了什么是缓冲区、缓冲区协议，以及存在的作用，并且通过 numpy 进行了解释。了解缓冲区，可以让你更加深刻地理解 numpy。 下面再来总结一下： 如果一个类型对象实现了 tp_as_buffer，那么它的实例对象便支持缓冲区协议； tp_as_buffer 是一个函数指针，指向的函数负责初始化 Py_buffer； 在共享缓冲区的时候，比如 np.frombuffer(obj)，会直接调用 obj 的类型对象的 tp_as_buffer 字段指向的函数，拿到 Py_buffer 实例的 buf 字段指向的缓冲区。但 numpy 不知道该怎么解析这个缓冲区，所以还需要我们指定 dtype 参数。 缓冲区存在的最大意义就是共享内存，numpy 的数组在拷贝的时候，默认只拷贝 Py_buffer 实例，至于 Py_buffer 的 buf 字段指向的缓冲区默认是不会拷贝的。比如数组有 100 万个元素，这些元素都存储在缓冲区中，被 Py_buffer 的 buf 字段指向，拷贝的时候这 100 万个元素是不会拷贝的。 numpy 数组的维度、shape，是借助于 Py_buffer 中的元信息体现的，维度和 shape 不同，访问缓冲区元素的方式也不同。但存储元素的缓冲区，永远是一个一维数组，由 buf 字段指向。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"25. 通过 bytes 对象的合并，探究缓冲区的奥秘 » 小结","id":"110","title":"小结"},"111":{"body":"bytes 对象是不可变对象，那么根据我们对浮点数的了解，可以大胆猜测 bytes 对象也有自己的缓存池。事实上确实如此，为了优化单字节 bytes 对象的创建效率，Python 底层维护了一个缓存池，该缓存池是一个 PyBytesObject * 类型的数组。 // Objects/bytesobject.c // 保存了 256 个单字节 bytes 对象，对应的 ASCII 码为 0 ~ 255\nstatic PyBytesObject *characters[UCHAR_MAX + 1];\n// 保存空 bytes 对象\nstatic PyBytesObject *nullstring; Python 内部创建单字节 bytes 对象时，会先检查目标对象是否已在缓存池中。PyBytes_FromString 函数是负责创建 bytes 对象的一个常用的 Python/C API，我们看一下它的逻辑。 // Objects/bytesobject.c // 基于 C 字符串创建 bytes 对象\nPyObject *\nPyBytes_FromString(const char *str)\n{ size_t size; // bytes 对象的长度 PyBytesObject *op; // 指向创建的 bytes 对象 assert(str != NULL); // 计算 C 字符串的长度，它和对应的 bytes 对象的长度是相等的 size = strlen(str); if (size > PY_SSIZE_T_MAX - PyBytesObject_SIZE) { PyErr_SetString(PyExc_OverflowError, \"byte string is too long\"); return NULL; } // 如果 size 等于 0，并且 nullstring 保存了空 bytes 对象，那么直接返回 if (size == 0 && (op = nullstring) != NULL) {\n#ifdef COUNT_ALLOCS _Py_null_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 如果 size 等于 1，比如 char *str = \"a\"，证明创建的是单字节对象 // 而 str 是字符串首元素的地址，所以 *str 会得到 'a'，即 97 // 假设 *str 是 97，那么 op 就是 bytes_characters[97] if (size == 1 && (op = characters[*str & UCHAR_MAX]) != NULL) {\n#ifdef COUNT_ALLOCS _Py_one_strings++;\n#endif Py_INCREF(op); return (PyObject *)op; } // 否则创建新的 PyBytesObject 对象，此时是个空 op = (PyBytesObject *)PyObject_MALLOC(PyBytesObject_SIZE + size); if (op == NULL) return PyErr_NoMemory(); // 初始化内部字段 (void)PyObject_INIT_VAR(op, &PyBytes_Type, size); op->ob_shash = -1; // 将 C 字符串拷贝到 ob_sval 中 memcpy(op->ob_sval, str, size+1); // 如果 size == 0，说明创建的是空 bytes 对象，那么赋值给 nullstring if (size == 0) { nullstring = op; Py_INCREF(op); } else if (size == 1) { // 如果 size == 1，说明创建的是单字节 bytes 对象，那么放入到缓存池中 // 并且在缓存池中的索引，就是该字节对应的 ASCII 码 characters[*str & UCHAR_MAX] = op; Py_INCREF(op); } // 转成泛型指针之后返回 return (PyObject *) op;\n} 整体来说并不难，该 API 会将 C 字符串全部拷贝到 ob_sval 中。但如果 C 字符串长度为 10，而我们只希望基于前 n 个字符创建 bytes 对象，这时候可以使用 PyBytes_FromStringAndSize 函数。 PyBytes_FromString(\"Hello World\") 会返回 b\"Hello World\"。 PyBytes_FromStringAndSize(\"Hello World\", 5) 会返回 b\"Hello\"，如果传递的第二个参数 size 和 C 字符串长度相同，那么效果和 PyBytes_FromString 是等价的。 至于 PyBytes_FromStringAndSize 的逻辑和 PyBytes_FromString 类似，缓存池部分也是一样的，可以自己看一下。 当 Python 程序开始运行时，字节序列缓存池是空的。但随着单字节 bytes 对象的创建，缓存池中的对象慢慢多了起来。这样一来，单字节序列首次创建后便在缓存池中缓存起来，后续再使用时会直接从缓存池中获取，避免重复创建和销毁。与前面章节介绍的小整数对象池一样，字节序列缓存池也只能容纳为数不多的 256 个单字节序列，但使用频率非常高。 缓存池技术作为一种以空间换时间的优化手段，只需较小的内存为代价，便可明显提升执行效率。 >>> a1 = b\"a\"\n>>> a2 = b\"a\"\n>>> a1 is a2\nTrue\n>>>\n>>> a1 = b\"ab\"\n>>> a2 = b\"ab\"\n>>> a1 is a2\nFalse\n>>> 显然此时不需要解释了，单字节 bytes 对象会缓存起来，放到缓存池中。至于空字节 bytes 对象，则是由专门的 nullstring 变量保存，它们都是单例的。 到目前为止，关于 bytes 对象的内容就说完了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"26. 解密 bytes 对象的缓存池","id":"111","title":"26. 解密 bytes 对象的缓存池"},"112":{"body":"前面我们介绍了 bytes 对象，本篇文章来聊一聊 bytearray 对象，这两者都表示字节串或者字节序列，它们的创建方式和支持的操作也是类似的。 # 基于列表创建，里面的元素为 0 ~ 255 的整数\nb1 = bytes([97, 98, 99])\nb2 = bytearray([97, 98, 99])\nprint(b1)\nprint(b2)\n\"\"\"\nb'abc'\nbytearray(b'abc')\n\"\"\" # 基于字符串创建\nb1 = bytes(\"hello\", encoding='utf-8')\nb2 = bytearray(\"hello\", encoding='utf-8')\nprint(b1)\nprint(b2)\n\"\"\"\nb'hello'\nbytearray(b'hello')\n\"\"\" b1 = bytes.fromhex(\"61626364\")\nb2 = bytearray.fromhex(\"61626364\")\nprint(b1)\nprint(b2)\n\"\"\"\nb'abcd'\nbytearray(b'abcd')\n\"\"\" 但区别在于 bytes 对象是不可变对象，bytearray 对象是可变对象。 # 也可以直接基于 bytes 对象创建 bytearray 对象\n# 反过来也是如此\nb = bytearray(b\"satori\")\nprint(b) # bytearray(b'satori') # 既然是可变对象，那么就意味着可以本地修改内部元素\n# 由于字节序列内部的每个元素都是 0 ~ 255 的整数\n# 因此这里修改时，也必须赋值整数\nb[0] = ord(\"S\")\nprint(b) # bytearray(b'Satori') # 当然，如果基于切片修改，那么需要赋值一个 bytes 对象\nb[0: 2] = b\"SA\"\nprint(b) # bytearray(b'SAtori')\n# 当然也可以赋值一个 bytearray 对象\n# 它和 bytes 对象本质一样，无非是 bytes 对象不能本地修改\nb[0: 3] = bytearray(b\"saT\")\nprint(b) # bytearray(b'saTori') # 在尾部追加字节\nb.append(ord(\" \"))\nb.append(ord(\"h\"))\nb.append(ord(\"e\"))\nb.append(ord(\"l\"))\nb.append(ord(\"l\"))\nb.append(ord(\"o\"))\nprint(b) # bytearray(b'saTori hello') 还是那句话，如果不需要对字节序列做修改的话，那么 bytes 对象和 bytearray 对象是等价的，我们使用 bytes 对象即可。但若是希望字节序列可变，那么只能使用 bytearray 对象。 下面我们来分析一下 bytearray 对象的底层实现。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 楔子","id":"112","title":"楔子"},"113":{"body":"bytearray 对象在底层由 PyByteArrayObject 结构体表示，定义如下。 // Include/bytearrayobject.h typedef struct { PyObject_VAR_HEAD Py_ssize_t ob_alloc; char *ob_bytes; char *ob_start; int ob_exports;\n} PyByteArrayObject; 解释一下每个字段的含义： PyObject_VAR_HEAD：变长对象的公共头部，包含引用计数、类型和长度。 ob_alloc：底层缓冲区的长度，即最多能容纳多少个字节。注意它和 ob_size 的区别，ob_size 表示 bytearray 对象的长度，也就是缓冲区当前已经容纳了多少个字节。如果 append 的时候发现 ob_size 达到了 ob_alloc，那么要对缓冲区进行扩容。 ob_bytes：指向缓冲区的指针，缓冲区是一个连续的内存块，用于存储字节序列的所有数据。 ob_start：ob_bytes 指向缓冲区的物理起始位置，而 ob_start 指向缓冲区的逻辑起始位置。说白了 ob_start 可以指向缓冲区的任意位置，允许字节序列使用部分缓冲区，比如通过切片 [1:] 进行截取，那么 ob_start 便指向缓冲区的第二个元素（逻辑起始位置），而无需重新分配内存。 ob_exports：缓冲区被外部对象引用的次数。 下面我们来创建几个 bytearray 对象，并通过画图来描述对应的底层结构。 b = bytearray(b\"\") 每个结构体字段都是 8 字节，所以一个空 bytearray 对象的大小是 56 字节。 >>> b = bytearray()\n>>> b\nbytearray(b'')\n>>> b.__sizeof__()\n56 结果和我们分析的一样。 b = bytearray(b\"abc\") 由于缓冲区长度为 4，因此大小为 56 + 4 = 60 字节。 >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60 所以我们可以得出结论，bytearray 对象的大小等于 56 + 缓冲区的长度，在不发生扩容的情况下，缓冲区的长度等于 ob_size + 1。 >>> name = \"古明地觉\"\n>>> b = bytearray(name, encoding=\"utf-8\")\n>>> >>> 56 + len(name) * 3 + 1\n69\n>>> b.__sizeof__()\n69 但如果发生扩容会怎么样呢？ >>> b = bytearray(b\"abc\")\n>>> b\nbytearray(b'abc')\n>>> b.__sizeof__()\n60\n# 添加一个元素\n>>> b.append(100)\n>>> b\nbytearray(b'abcd')\n>>> b.__sizeof__()\n63 添加一个元素之后，大小从 60 变成了 63，难道不应该是 61 吗？之所以出现这个现象，就是因为扩容的时候多申请了两个字节，我们画张图来展示一下这个过程。 以上就是 bytearray 对象的底层结构。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的底层实现","id":"113","title":"bytearray 对象的底层实现"},"114":{"body":"说完了 bytearray 对象的底层结构之后，再来看看它是怎么创建的？ // Objects/bytearrayobject.c PyObject *\nPyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)\n{ // 基于 C 的字符数组创建 bytearray 对象 // 参数 size 表示 bytearray 对象的长度 PyByteArrayObject *new; Py_ssize_t alloc; // size 必须大于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyByteArray_FromStringAndSize\"); return NULL; } // size 必须小于 PY_SSIZE_T_MAX if (size == PY_SSIZE_T_MAX) { return PyErr_NoMemory(); } // 为 PybyteArrayObject 申请内存，此处调用的是泛型 API new = PyObject_New(PyByteArrayObject, &PyByteArray_Type); // 申请失败返回 NULL if (new == NULL) return NULL; // 如果 size == 0，表示 bytearray 对象的长度为 0 // 那么将 ob_bytes 设置为 NULL，将 alloc 设置为 0 if (size == 0) { new->ob_bytes = NULL; alloc = 0; } else { // 否则将 alloc 设置为 size + 1，因为要多一个 '\\0' alloc = size + 1; // 申请 alloc 个字节的内存，赋值给 ob_bytes new->ob_bytes = PyObject_Malloc(alloc); // 为 NULL 表示申请失败，内存不足 if (new->ob_bytes == NULL) { Py_DECREF(new); return PyErr_NoMemory(); } // 将参数 bytes（这里是 C 字符串）拷贝到 ob_bytes 指向的缓冲区 // 在拷贝的时候，可以指定拷贝的长度，通过 size 参数指定 // 如果希望整个字符串全部拷贝，那么将 size 指定为 strlen(bytes) 即可 if (bytes != NULL && size > 0) memcpy(new->ob_bytes, bytes, size); // 将最后一个元素（索引为 size）设置为 '\\0' new->ob_bytes[size] = '\\0'; /* Trailing null byte */ } // 将 ob_size 字段初始化为 size Py_SIZE(new) = size; // 将 ob_alloc 字段初始化为 alloc new->ob_alloc = alloc; // ob_start 默认等于 ob_bytes new->ob_start = new->ob_bytes; // 缓冲区被引用的次数为 0，因为刚创建 new->ob_exports = 0; // 转成泛型指针之后返回 return (PyObject *)new;\n} 之前在创建 bytes 对象的时候介绍过 PyBytes_FromStringAndSize 这个函数，创建 bytearray 对象和它是类似的。但需要注意的是，bytes 对象和 bytearray 对象都实现了缓冲区，但这两者有一个区别。 bytes 对象的缓冲区存储在 PyBytesObject 结构体内部； bytearray 对象则不是这样，PyByteArrayObject 内部存储的是指针，指针指向了缓冲区； 我们回顾一下这两个结构体的定义。 PyBytesObject 里面的 ob_sval 是一个数组，而 PyByteArrayObject 的 ob_bytes 是一个指针。那为什么会出现这种情况呢？原因在这个系列的最开始就说过了，bytes 对象是不可变的，元素会直接存储在对应的结构体内部。 而 bytearray 对象是可变的，那么它内部只能存储指针，指针指向的内存区域负责存储元素。如果发生扩容，只需申请一片更大的内存区域并将元素拷贝过去，然后改变指针（ob_bytes）指向即可。至于 bytearray 对象本身的地址是不会发生任何变化的，它的扩容对引用它的变量来说是无感知的。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » bytearray 对象的创建","id":"114","title":"bytearray 对象的创建"},"115":{"body":"以上就是 bytearray 对象，关于它的具体操作就不赘述了，和 bytes 对象是类似的，可以自己尝试读一读。 总之在工作中，如果你不明确需要字节序列可变，那么使用 bytes 对象即可，否则使用 bytearray 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"27. 详解 bytearray 对象的底层实现 » 小结","id":"115","title":"小结"},"116":{"body":"接下来我们将分析 Python 的字符串，这应该是使用频率最高的数据结构了，我们会通过多篇文章来详细阐述字符串的实现原理。 首先字符串是一个变长对象，因为不同长度的字符串所占的内存是不一样的。但同时字符串又是一个不可变对象，因为一旦创建就不可以再修改了。","breadcrumbs":"28. 字符集和字符编码 » 楔子","id":"116","title":"楔子"},"117":{"body":"我们知道计算机的存储单位是字节，一个字节可以表示 256 种字符，对于发明计算机的美国人来说足够了。因为英文字母算上大小写只有 52 个，即便再加上一些特殊字符，数量也不会超过 256 个，因此一个字节完全可以表示。 但随着计算机的普及，越来越多的非英文字符出现，导致一个字节已经无法表示了。所以只能曲线救国，对于一个字节无法表示的字符，使用多个字节表示，这便是多字节编码。而多字节编码也存在相应的问题，就是容易出现乱码。 到这里先不继续往下深入，我们先来理清楚一些概念。","breadcrumbs":"28. 字符集和字符编码 » 多字节编码","id":"117","title":"多字节编码"},"118":{"body":"估计有很多小伙伴搞不清这两者的区别，我们先来解释一下所谓的字符集和字符编码是怎么一回事？ 字符集：系统支持的所有字符组成的集合，像 ASCII、GB2312、Big5、unicode 都属于字符集。只不过不同的字符集所能容纳的字符个数不同，比如 ASCII 字符集不包含中文，unicode 则可以容纳世界上的所有字符； 多字节编码：负责将每个字符转成一个或多个计算机可以接受的具体数字，该数字可以理解为编号，因此字符编码维护了字符和编号之间的对应关系。而编码也分为多种，比如 ASCII、GBK、UTF-8 等等，字符编码不同，那么字符转换之后的编号也不同，当然能转化的字符种类也不同。比如 ASCII 这种字符编码，它就只能转换 ASCII 字符。 当然，ASCII 比较特殊，它既是字符集、也是字符编码。并且不管采用什么编码，ASCII 字符对应的编号永远是相同的。 将字符串中的每一个字符转成对应的编号，那么得到的就是字节序列（bytes 对象），因为计算机存储和网络通讯的基本单位都是字节，所以字符串必须以字节序列的形式进行存储或传输。 因此字符串和字节序列在某种程度上是很相似的，字符串按照指定的编码进行 encode 即可得到字节序列，也就是将每个字符都转成对应的编号；字节序列按照相同的编码 decode 即可得到字符串，也就是根据编号找到对应的字符。 比如我们写了一段文本，然后在存储的时候必须先进行 encode，也就是将每一个字符都转成一个或多个系统可以接受的数字、即对应的编号之后，才可以进行存储。 name = \"古明地觉\" print(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\"\nprint(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 采用不同的编码，得到的字节序列是不同的，比如使用 gbk 编码 encode，那么也必须使用 gbk 编码 decode。否则会因为无法解析而报错，因为字符编码不同，字符对应的编号也不同。 再比如每个国家都有自己的字符编码，你在日本的一台计算机上写好的文件拿到中国的计算机上打开，很有可能出现乱码。因为字符编码不同，字符和编号之间的对应关系也不同，采用不同的字符编码进行解析肯定会出问题。 但我们说，对于 ASCII 字符来说，由于不管采用哪一种编码，它们得到的编号都是固定的。所以编码对于 ASCII 字符来说，没有任何影响。 name = \"satori\" print(name.encode(\"gbk\"))\n\"\"\"\nb'satori'\n\"\"\"\nprint(name.encode(\"gbk\").decode(\"utf-8\"))\n\"\"\"\nsatori\n\"\"\" # 但如果是非 ASCII 字符，就不行了\ntry: \"你好\".encode(\"gbk\").decode(\"utf-8\")\nexcept UnicodeDecodeError as e: print(e) \"\"\" 'utf-8' codec can't decode byte 0xc4 in position 0: invalid continuation byte \"\"\" 这里再回忆一下 bytes 对象，创建的时候可以采用字面量的方式，比如 b\"abc\"，但是 b\"憨\" 却不可以。原因就是憨这个字符不是 ASCII 字符，那么采用不同的字符编码，其对应的编号是不同的。而解释器又不知道我们使用的是哪一种编码，所以不允许这么做，而是需要通过 \"憨\".encode() 的方式手动指定字符编码。 但对于 ASCII 字符而言，不管采用哪一种字符编码，得到的编号都是一样的， 所以 Python 针对 ASCII 字符则允许这种做法，比如 b\"abc\"。并且我们看到，对于汉字来说，在编码之后会对应多个编号，而每个编号占 1 字节，因此不同的字符所占的大小可能不同。","breadcrumbs":"28. 字符集和字符编码 » 字符集和字符编码","id":"118","title":"字符集和字符编码"},"119":{"body":"以上就是字符集和字符编码，字符集就是字符组成的集合，不同字符集所能容纳的字符数量是有限的。字符编码是将字符转成对应的编号，比如将一个字符串中的所有字符都转成对应的编号之后，就得到了字节序列。当然和字符集一样，字符编码能转换的字符种类也是有限的，像汉字我们可以使用 GBK 编码、UTF-8 编码，但是不能使用 ASCII 编码。 以上算是理清楚了一些概念，显然过于简单了，主要是为后面的内容做铺垫。那么下一篇文章，我们就从 Python 的角度来分析字符串的存储方式。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"28. 字符集和字符编码 » 小结","id":"119","title":"小结"},"12":{"body":"以上我们就分析了对象的种类，对象可以被分为可变对象和不可变对象，以及变长对象和定长对象。 不可变对象：对象不支持本地修改； 可变对象：对象支持本地修改； 变长对象：对象维护的值不同，占用的内存大小也不同； 定长对象：占用的内存大小始终固定； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 小结","id":"12","title":"小结"},"120":{"body":"上一篇文章我们介绍了字符集，它是一系列字符组成的集合，但不同的字符集所能容纳的字符是有限的。于是为了能将全世界的字符统一起来，便诞生了 unicode。 unicode 字符集对世界上出现的所有字符都进行了系统的整理，包括各种 emoji，不管是哪个国家的语言，都可以使用 unicode 字符集。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"て\")) # 12390 不管什么文字，都可以用一个 unicode 来表示，它们在字符集中对应一个唯一的码点。所谓码点，就是字符在字符集中的索引，或者说唯一编号。 但是问题来了，unicode 能表示这么多的字符，占用的内存一定不低吧。的确，根据当时的编码，一个 unicode 字符最高会占用到 4 字节，因此对西方人来说就有点苦不堪言了，明明一个字节就够用了，为啥需要那么多。于是又出现了 utf-8，它是为 unicode 提供的一个新的编码规则，具有可变长的功能。不同种类的字符占用的大小不同，比如英文字符使用一个字节存储，汉字使用 3 个字节存储，emoji 使用 4 个字节存储。 但 Python 在表示 unicode 字符串时，使用的却不是 utf-8 编码，至于原因我们下面来分析一下。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 楔子","id":"120","title":"楔子"},"121":{"body":"从 Python3 开始，字符串使用的是 unicode。而根据编码的不同，unicode 的每个字符最大可以占用 4 字节，从内存的角度来说，这种编码有时会比较昂贵。为了减少内存消耗并且提高性能，Python 的内部使用了三种编码方式来表示 unicode。 Latin-1 编码：每个字符占 1 字节; UCS2 编码：每个字符占 2 字节； UCS4 编码：每个字符占 4 字节； 在 Python 编程中，所有字符串的行为都是一致的，而且大多数时候我们都没有注意到差异。然而在处理大文本的时候，这种差异就会变得异常显著，甚至有些让人出乎意料。为了看到内部表示的差异，我们看一下字符串所占的内存大小。 >>> sys.getsizeof(\"a\")\n50\n>>> sys.getsizeof(\"憨\")\n76\n>>> sys.getsizeof(\"😂\")\n80 我们看到都是一个字符，但它们占用的内存却是不一样的。因为 Python 面对不同的字符会采用不同的编码，进而导致大小不同。但需要注意的是，Python 的每一个字符串都需要额外占用至少 49 个字节，因为要存储一些元数据，比如：公共的头部、哈希、长度、字节长度、编码类型等等。 import sys # 对于 ASCII 字符，一个占 1 字节，此时是 Latin-1 编码\nprint(sys.getsizeof(\"ab\") - sys.getsizeof(\"a\")) # 1 # 对于汉字，日文等等，一个占 2 字节，此时是 UCS2 编码\nprint(sys.getsizeof(\"憨憨\") - sys.getsizeof(\"憨\")) # 2\nprint(sys.getsizeof(\"です\") - sys.getsizeof(\"で\")) # 2 # 像 Emoji，则是一个占 4 字节 ，此时是 UCS4 编码\nprint(sys.getsizeof(\"😂😂\") - sys.getsizeof(\"😂\")) # 4 而采用不同的编码，底层结构体实例的元数据也会占用不同大小的内存。 # 所以一个空字符串占用 49 个字节\n# 此时会采用占用内存最小的 Latin-1 编码\nprint(sys.getsizeof(\"\")) # 49\n# 此时使用 UCS2\nprint(sys.getsizeof(\"憨\") - 2) # 74\n# UCS4\nprint(sys.getsizeof(\"🍌\") - 4) # 76 如果编码是 Latin-1，那么结构体实例的元数据会占 49 个字节；编码是 UCS2，占 74 个字节；编码是 UCS4，占 76 个字节。然后字符串所占的字节数就等于：元数据 + 字符个数 * 单个字符所占的字节。","breadcrumbs":"29. Python 是怎么存储字符串的？ » unicode 的三种编码","id":"121","title":"unicode 的三种编码"},"122":{"body":"上面提到的三种编码是 Python 在底层所使用的，但我们知道 unicode 还有一个 utf-8 编码，那 Python 为啥不用呢？ 先来抛出一个问题，我们知道 Python 支持通过索引查找一个字符串指定位置的字符（注意不是字节），比如 s[2] 查找的就是字符串 s 中的第 3 个字符。 s = \"古明地觉\"\nprint(s[2]) # 地 那么问题来了，通过索引查找字符串的某个字符，时间复杂度为 O(1)，那么 Python 是怎么通过索引瞬间定位到指定字符的呢？显然是通过指针的偏移，用索引乘上每个字符占的字节数，得到偏移量，然后从头部向后偏移指定数量的字节即可，这样就能在定位到指定字符的同时还保证时间复杂度为 O(1)。 但是这需要一个前提：字符串中每个字符所占的大小必须是相同的，如果字符占的大小不同，比如有的占 1 字节、有的占 3 字节，显然就无法通过指针偏移的方式了。这个时候若还想准确定位的话，只能按顺序对所有字符都逐个扫描，但这样的话时间复杂度肯定不是 O(1)，而是 O(n)。 我们以 Go 为例，Go 字符串默认就是使用的 utf-8 编码。 package main import \"fmt\" func main() { s := \"古明地觉\" fmt.Println(s[2]) // 164 fmt.Println(string(s[2])) // ¤\n} 惊了，我们看到打印的并不是我们希望的结果。因为 Go 底层使用的是 utf-8 编码，不同的字符可能会占用不同的字节。但 Go 通过索引定位的时间复杂度也是 O(1)，所以定位的时候是以字节为单位、而不是字符。在获取的时候也只会获取一个字节，而不是一个字符。 所以 s[2] 在 Go 里面指的是第 3 个字节，而不是第 3 个字符，而汉字在 utf-8 编码下占 3 个字节，所以 s[2] 指的就是汉字古的第三个字节。我们看到打印的时候，该字节的值为 164。 s = \"古明地觉\"\nprint(s.encode(\"utf-8\")[2]) # 164 这就是采用 utf-8 编码带来的弊端，它无法让我们以 O(1) 的时间复杂度去准确地定位字符，尽管它在存储的时候更省内存。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 为什么不使用 utf-8 编码","id":"122","title":"为什么不使用 utf-8 编码"},"123":{"body":"Python 会使用 3 种编码来表示 unicode，所占字节大小分别是 1、2、4 字节。 因此 Python 在创建字符串的时候会先扫描，尝试使用占字节数最少的 Latin-1 编码存储，但是范围肯定有限。如果发现存储不下的字符，只能改变编码，使用 UCS2，然后继续扫描。但如果又发现 UCS2 也无法存储的字符，因为两个字节最多表示 65535 个不同的字符，那么会再次改变编码，使用 UCS4。UCS4 占四个字节，肯定能存下了。 一旦改变编码，字符串中的所有字符都会使用同样的编码，因为它们不具备可变长功能。比如字符串 \"hello 古明地觉\"，肯定都会使用 UCS2，不存在 \"hello \" 使用 Latin-1，\"古明地觉\" 使用 UCS2，因为一个字符串只能有一个编码。 当通过索引获取的时候，会将索引乘上每个字符占的字节数，这样就能跳到准确位置上，因为字符串的所有字符占的字节都是一样的，然后获取的时候也会获取指定的字节数。比如使用 UCS2 编码，那么定位到某个字符的时候，会取两个字节，这样才能表示一个完整的字符。 import sys # 此时全部是 ascii 字符，那么 Latin-1 编码可以存储\n# 所以结构体实例的元数据占 49 个字节\ns1 = \"hello\"\n# 有 5 个字符，一个字符一个字节，所以加一起是 54 个字节\nprint(sys.getsizeof(s1)) # 54 # 出现了汉字，那么 Latin-1 肯定存不下，于是使用 UCS2\n# 所以结构体实例的元数据占 74 个字节\n# 但是别忘了此时的英文字符也是 UCS2，所以也是一个字符两字节\ns2 = \"hello憨\"\n# 6 个字符，74 + 6 * 2 = 86\nprint(sys.getsizeof(s2)) # 86 # 这个牛逼了，UCS2 也存不下，只能 UCS4 存储了\n# 所以结构体实例的元数据占 76 个字节\ns3 = \"hello憨🍌\"\n# 此时所有字符一个占 4 字节，总共 7 个字符\n# 76 + 7 * 4 = 104\nprint(sys.getsizeof(s3)) # 104 除此之外，我们再举一个例子更形象地证明这个现象。 import sys s1 = \"a\" * 1000\ns2 = \"a\" * 1000 + \"🍑\" # 我们看到 s2 只比 s1 多了一个字符\n# 但是两者占的内存，s2 却将近是 s1 的 4 倍。\nprint(sys.getsizeof(s1)) # 1049\nprint(sys.getsizeof(s2)) # 4080 s2 和 s1 的差别只是 s2 比 s1 多了一个字符，但就是这么一个字符导致 s2 比 s1 多占了 3031 个字节。然而这 3031 个字节不可能是多出来的字符所占的大小，什么字符一个会占到三千多个字节，这是不可能的。 尽管如此，它也是罪魁祸首，但前面的 1000 个字符也是共犯。我们说 Python 会根据字符串选择不同的编码，s1 全部是 ASCII 字符，所以 Latin1 能存下，因此一个字符只占一个字节，所以大小就是 49 + 1000 = 1049。 对于 s2，Python 发现前 1000 个字符 Latin1 能存下，但不幸的是最后一个字符存不下，于是只能使用 UCS4。而字符串的所有字符只能有一个编码，为了保证索引查找的时间复杂度为 O(1)，前面一个字节就能存下的字符，也需要用 4 字节来存储，这是 Python 的设计策略。 而使用 UCS4，结构体的元数据会占 76 个字节，因此 s2 的大小就是 76 + 1001 * 4 = 4080。 # 74 + 7 * 2 = 88\n>>> sys.getsizeof(\"爷的青春回来了\") 88 # 76 + 7 * 4 = 104\n>>> sys.getsizeof(\"👴的青春回来了\")\n104 字符数量相同但是占用内存大小不同，相信原因你肯定能分析出来。 所以如果字符串中的所有字符都是 ASCII 字符，则使用 1 字节 Latin1 编码。Latin1 能表示前 256 个 unicode 字符，它支持多种拉丁语，如英语、瑞典语、意大利语、挪威语。但是它们不能存储非拉丁语言，比如汉语、日语、希伯来语、西里尔语。这是因为它们的码点（数字索引）定义在 1 字节（0 ~ 255）范围之外。 大多数自然语言的文字都采用 2 字节（UCS2）编码，但当字符串包含特殊符号、Emoji 或稀有语言时，则使用 4 字节（UCS4）编码。unicode 标准有将近 300 个块（范围），你可以在 0XFFFF 块之后找到 4 字节块。 假设我们有一个 10G 的 ASCII 文本，想把它加载到内存中，但如果在文本中插入一个表情符号，那么字符串的大小将增加 4 倍。这是一个巨大的差异，你可能会在实践当中遇到，比如处理 NLP 问题。 print(ord(\"a\")) # 97\nprint(ord(\"憨\")) # 25000\nprint(ord(\"😁\")) # 128513 所以最著名和最流行的 unicode 编码都是 utf-8，但 Python 不在内部使用它，而是使用 Latin1、UCS2、UCS4。至于原因我们上面已经解释的很清楚了，主要是字符串的索引是基于字符，而不是字节。 当一个字符串使用 utf-8 编码存储时，每个字符会根据自身选择一个合适的大小，这是一种存储效率很高的编码，但它有一个明显的缺点。由于每个字符的字节长度可能不同，就导致无法按照索引瞬间定位到单个字符，即便能定位，也无法定位准确。如果想准，那么只能逐个扫描所有字符。 假设要对使用 utf-8 编码的字符串执行一个简单的操作，比如 s[5]，就意味着解释器需要扫描每一个字符，直到找到需要的字符，这样效率是很低的。但如果是固定长度的编码就没有这样的问题，所以当 Latin1 存储的 \"hello\"，在和 UCS2 存储的 \"古明地觉\" 组合之后，整体每一个字符都会向大的方向扩展，变成 2 字节。 这样定位字符的时候，只需要将 索引 * 2 便可计算出偏移的字节数，然后跳转该字节数即可。但如果原来的 \"hello\" 还是 1字节，而汉字是 2 字节，那么只通过索引是不可能定位到准确字符的，因为不同类型的字符的大小不同，必须要扫描整个字符串才可以。但是扫描字符串，效率又比较低，所以 Python 内部才会使用这个方法，而不是使用 utf-8。 因此对于 Go 来讲，如果想像 Python 一样，那么需要这么做： package main import \"fmt\" func main() { s := \"hello古明地觉\" // 我们看到长度为 17，因为使用 utf-8 编码，并且 len 函数统计的是字节的数量 fmt.Println(s, len(s)) // hello古明地觉 17 // 如果想像 Python 一样，那么可以使用 Go 提供的 rune，相当于 int32 // 此时每个字符均使用 4 个字节，所以长度变成了 9 r := []rune(s) fmt.Println(string(r), len(r)) // hello古明地觉 9 // 虽然打印的内容是一样的，但此时每个字符都使用 4 字节存储 // 此时跳转会偏移 5 * 4 个字节，然后获取也会获取 4 个字节，因为一个字符占 4 个字节 fmt.Println(string(r[5])) // 古\n} 由于 utf-8 编码的 unicode 字符串里面的字符可能占用不同的字节，显然没办法实现 Python 字符串的索引查找效果，因此 Python 没有使用 utf-8 编码。 Python 的做法是让字符串的所有字符都占用相同的字节，先使用占用内存最少的 Latin1，不行的话再使用 UCS2，还不行则使用 UCS4。但不管使用哪种编码，都会确保每个字符占用的字节是一样的。至于原因上面分析的很透彻了，因为无论是索引还是切片，还是计算长度等等，都是基于字符来的，显然这也符合人类的思维习惯。","breadcrumbs":"29. Python 是怎么存储字符串的？ » Latin-1、UCS2、UCS4 该使用哪一种","id":"123","title":"Latin-1、UCS2、UCS4 该使用哪一种"},"124":{"body":"以上就是 Python 字符串的存储策略，它并没有使用最为流行的 utf-8，归根结底就在于这种编码不适合 Python 字符串。当然，我们在将字符串转成字节序列的时候，一般使用的都是 utf-8 编码。 下一篇文章来介绍字符串的底层实现，看看字符串在底层是如何设计的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"29. Python 是怎么存储字符串的？ » 小结","id":"124","title":"小结"},"125":{"body":"我们之前提到，字符串采用不同的编码，底层的结构体实例的元数据所占用的内存是不一样的。其实本质上是，字符串会根据编码的不同，而选择不同的存储结构。 PyASCIIObject：字符串仅包含 ASCII 字符； PyCompactUnicodeObject：字符串包含非 ASCII 字符，但可以紧凑表示； PyUnicodeObject：通用结构，可以表达所有类型的字符串（该结构不做讨论）； 需要强调的是，虽然 ASCII 字符占一字节，但只有码点小于 128 的字符才叫 ASCII 字符。 下面我们来分析一下。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 楔子","id":"125","title":"楔子"},"126":{"body":"unicode 会根据编码的不同而分为以下几类。 // Include/cpython/unicodeobject.h\nenum PyUnicode_Kind { // 所有字符的码点均位于 U+0000 ~ U+00FF PyUnicode_1BYTE_KIND = 1, // 所有字符的码点均位于 U+0000 ~ U+FFFF // 且至少有一个大于 U+00FF PyUnicode_2BYTE_KIND = 2, // 所有字符的码点均位于 U+0000 ~ U+10FFFF // 且至少有一个大于 U+FFFF PyUnicode_4BYTE_KIND = 4\n}; 而采用不同的编码，每个字符的大小也是不同的。 // Include/unicodeobject.h\ntypedef uint32_t Py_UCS4;\ntypedef uint16_t Py_UCS2;\ntypedef uint8_t Py_UCS1; Python 有一个内置函数 ord，可以查看字符的码点。 如果码点位于 0 ~ 255，那么使用 Py_UCS1，占 1 字节； 如果码点位于 256 ~ 65535，那么使用 Py_UCS2，占 2 字节； 如果码点大于 65535，那么使用 Py_UCS4，占 4 字节； 通过字符的范围，选择一个最合适的存储单元，从而节省内存。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » unicode 分类","id":"126","title":"unicode 分类"},"127":{"body":"如果字符串只包含 ASCII 字符，即字符的码点均小于 128，那么底层使用 PyASCIIObject 进行存储。 // Include/cpython/unicodeobject.h\ntypedef struct { // 对象的公共头部 PyObject_HEAD // 字符串的长度，充当了 ob_size Py_ssize_t length; // 哈希值，初始为 -1 Py_hash_t hash; struct { // 字符串是否开启 intern 机制，后续介绍 unsigned int interned:2; // 类型，标识每个存储单元的大小，可以有以下几种 // PyUnicode_1BYTE_KIND // PyUnicode_2BYTE_KIND // PyUnicode_4BYTE_KIND unsigned int kind:3; // 字符串是否紧凑表示，它是针对内存分配方案而言的 /* 紧凑的字符串由 PyASCIIObject 和 PyCompactUnicodeObject 表示 它的特点是对象和文本缓冲区是结合的，只需要一个内存块 */ /* 非紧凑的字符串由 PyUnicodeObject 表示（不是本文的重点） 它的特点是对象和文本缓冲区是分离的，需要两个内存块 一个负责存储 PyUnicodeObject 对象，另一个负责存储文本缓冲区 */ unsigned int compact:1; // 字符串是否只包含 ASCII 字符，如果是则为 1, 否则为 0 // 虽然一个字节可表示的范围是 0 ~ 255，但只有 0 ~ 127 之间的才是 ASCII 字符 unsigned int ascii:1; // 对象布局是否已完全初始化，不用关注 unsigned int ready:1; // 注意上面的字段名后面跟着 :数字，这是 C 语言的位域 // 比如 interned:2 表示使用 unsigned int 的前 2 个位 // 所以 struct state 结构体总共占 4 字节，因为所有字段共用 4 字节内存 // 上面总共使用了 8 个位，显然这里的 :24 负责占满 32 个位 unsigned int :24; } state; // 缓存宽字符格式（wide character）的字符串，无需关注，在之后的版本会被移除 wchar_t *wstr;\n} PyASCIIObject; 那么问题来了，实际的字符串文本数据存在了什么地方，我们没看到结构体里面有哪个字段负责存储文本啊。答案很简单，字符串文本会直接跟在 PyASCIIObject 结构体实例的后面，也就是紧凑表示。 我们以字符串 \"miu\" 为例，看一下它的底层结构。 注：为优化内存访问效率，结构体字段会进行内存对齐，所以 state 后面会多出一个 4 字节的空洞。 再来分析一下为什么一个空字符串会占 49 个字节，因为 ob_refcnt、ob_type、length、hash、wstr 都是 8 字节，加起来 40 字节。而 state 是 4 字节，但又留下了 4 字节的空洞，加起来也是 8 字节，所以总共占 40 + 8 = 48 个字节。然后还有一个 '\\0'，所以还要加上一个 1，总共 49 字节。 而对于 \"miu\" 这个 unicode 字符串来说，占的总字节数就是 49 + 3 = 52。 >>> import sys\n>>> sys.getsizeof(\"abc\")\n52 当字符串只包含 ASCII 字符时，由 PyASCIIObject 结构体表示，大小等于 49 + 字符串长度。当然啦，我们也可以认为大小等于 48 + (字符串长度 + 1)，这样理解起来更直观一些。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyASCIIObject","id":"127","title":"PyASCIIObject"},"128":{"body":"如果字符串包含了非 ASCII 字符，那么由 PyCompactUnicodeObject 结构体表示，假设字符串中码点最大的字符的码点为 maxchar。 if maxchar < 128: struct = PyASCIIObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 1\nelif maxchar < 256: struct = PyCompactUnicodeObject kind = PyUnicode_1BYTE_KIND # 1 ascii = 0\nelif maxchar < 65536: struct = PyCompactUnicodeObject kind = PyUnicode_2BYTE_KIND # 2 ascii = 0\nelse: struct = PyCompactUnicodeObject kind = PyUnicode_4BYTE_KIND # 4 ascii = 0 看一下 PyCompactUnicodeObject 的底层结构。 // Include/cpython/unicodeobject.h\ntypedef struct { PyASCIIObject _base; // 字符串的 utf-8 编码长度 Py_ssize_t utf8_length; // 字符串使用 utf-8 编码的结果，这里是缓存起来从而避免重复的编码运算 char *utf8; // 宽字符的数量 Py_ssize_t wstr_length;\n} PyCompactUnicodeObject; PyCompactUnicodeObject 相当于在 PyASCIIObject 的基础上增加了 3 个字段，那么它实例的大小是多少呢？由于新增的三个字段，每个都是 8 字节，并且字符串文本会紧跟在 PyCompactUnicodeObject 的后面，所以大小一目了然。 PyCompactUnicodeObject 实例的大小等于 48 + 24 + (字符串长度 + 1) * 每个字符的大小，即 72 + (字符串长度 + 1) * 每个字符的大小 因此以后在看到一个字符串时，我们可以很轻松地计算出它的大小。 import sys\n# 只包含 ASCII 字符，那么结构体使用 PyASCIIObject\n# 这样的字符串所占的内存大小为 48 + (字符串长度 + 1)\nonly_ascii = \"satori\"\n# 所以结果是 48 + (6 + 1) = 55 字节\nprint(sys.getsizeof(only_ascii))\n\"\"\"\n55\n\"\"\" # 包含非 ASCII 字符，结构体使用 PyCompactUnicodeObject\n# 但所有字符的码点均小于 256，因此编码仍使用 Py_UCS1\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1)\nnon_ascii_with_ucs1 = \"sator¡\"\n# 所以结果是 72 + (6 + 1) = 79 字节\nprint(sys.getsizeof(non_ascii_with_ucs1))\n\"\"\"\n79\n\"\"\" # 字符的码点达到了 256，但小于 65536，因此编码使用 Py_UCS2\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 2\n# 注意：因为编码使用 Py_UCS2，那么 \\0 也要占两个字节\nnon_ascii_with_ucs2 = \"憨pi\"\n# 所以结果是 72 + (3 + 1) * 2 = 80\nprint(sys.getsizeof(non_ascii_with_ucs2))\n\"\"\"\n80\n\"\"\" # 字符的码点达到了 65536，因此编码使用 Py_UCS4\n# 这样的字符串所占的内存大小为 72 + (字符串长度 + 1) * 4\n# 因为编码使用 Py_UCS4，那么 \\0 也要占 4 个字节\nnon_ascii_with_ucs4 = \"🍌君\"\n# 所以结果是 72 + (2 + 1) * 4 = 84\nprint(sys.getsizeof(non_ascii_with_ucs4))\n\"\"\"\n84\n\"\"\" 所以随着编码的不同，一个 Python 字符串的元数据（包含 '\\0'）会占据不同的大小，假设字符串中码点最大的字符的码点为 maxchar。 如果 maxchar < 128，那么采用 Latin-1 编码，结构体为 PyASCIIObject，元数据的大小为 48 + 1 = 49。 如果 128 <= maxchar < 256，那么采用 Latin-1 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 1 = 73。 如果 256 <= maxchar < 65536，那么采用 USC2 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 2 = 74。 如果 maxchar >= 65536，那么采用 USC4 编码，结构体为 PyCompactUnicodeObject，元数据的大小为 72 + 4 = 76。 所以我们之前说根据编码的不同，字符串的额外部分可能占据 49、74、76字节，这个结论其实不够准确，还漏掉了一个 73。因为 128 <= maxchar < 256 的字符串虽然不是 ASCII 字符串，但它仍然使用 Latin-1 编码，所以 '\\0' 占的是 1 字节，而不是 2 字节和 4 字节。 下面通过画图来描述一下这几个字符串的底层结构，由于 ASCII 字符串已经说过了，这里就不再赘述了。 non_ascii_with_ucs1 = \"sator¡\" 注意结尾的是字符 ¡，不是 i。 每个字符占一字节，所以大小是 72 + 7= 79 字节，然后 kind 为 PyUnicode_1BYTE_KIND。 import sys print(sys.getsizeof(\"sator¡\")) # 79 只有所有的字符的码点都小于 128，才叫 ASCII 字符串。而 ¡ 的码点是 161，所以 \"sator¡\" 不是 ASCII 字符串，但它的每个字符仍然只需一个字节存储。 non_ascii_with_ucs2 = \"憨pi\" 每个字符占两字节，所以大小是 72 + 4 * 2 = 80 字节，然后 kind 为 PyUnicode_2BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"憨pi\"))\n80 non_ascii_with_ucs4 = \"🍌君\" 每个字符占四字节，所以大小是 72 + 3 * 4 = 84 字节，然后 kind 为 PyUnicode_4BYTE_KIND。 >>> import sys\n>>> print(sys.getsizeof(\"🍌君\"))\n84 以上我们就讨论了不同编码的字符串的底层结构，以及内存计算方式。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » PyCompactUnicodeObject","id":"128","title":"PyCompactUnicodeObject"},"129":{"body":"我们再来看一下解释器是怎么为字符串申请内存的，这个过程会调用 PyUnicode_New 函数。 该函数接收一个 size 参数和 maxchar 参数，负责申请容纳 size 个字符的 unicode 对象。而 maxchar 表示所有字符的码点中最大的那一个，对象的每个字符占多大空间，则基于 maxchar 进行判断。 // Objects/unicodeobject.c PyObject *\nPyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)\n{ // 声明相关变量 PyObject *obj; PyCompactUnicodeObject *unicode; void *data; enum PyUnicode_Kind kind; int is_sharing, is_ascii; Py_ssize_t char_size; Py_ssize_t struct_size; // 如果 size 为 0，返回空字符串，注：空字符串是单例的 if (size == 0 && unicode_empty != NULL) { Py_INCREF(unicode_empty); return unicode_empty; } is_ascii = 0; is_sharing = 0; struct_size = sizeof(PyCompactUnicodeObject); // 如果 maxchar 小于 128，说明全部是 ASCII 字符 // 此时结构体使用 PyASCIIObject if (maxchar < 128) { kind = PyUnicode_1BYTE_KIND; // kind 为 1 char_size = 1; // 字符大小为 1 is_ascii = 1; // 是 ASCII 字符串 struct_size = sizeof(PyASCIIObject); // 结构体大小 } // 否则说明字符串包含非 ASCII 字符，那么 is_ascii 为 0 // 此时结构体一律使用 PyCompactUnicodeObject else if (maxchar < 256) { // 如果 maxchar 小于 256，那么 kind 依旧为 1，字符大小为 1 kind = PyUnicode_1BYTE_KIND; char_size = 1; } else if (maxchar < 65536) { // 如果 maxchar 小于 65536，那么 kind 为 2，字符大小为 2 kind = PyUnicode_2BYTE_KIND; char_size = 2; if (sizeof(wchar_t) == 2) is_sharing = 1; } else { // 否则说明要采用 4 字节存储，此时 kind 为 4，字符大小为 4 // 注意：maxchar 也是有范围的，不能超过 0x10ffff // 不过目前也没有哪个字符的码点能超过这个值 if (maxchar > MAX_UNICODE) { PyErr_SetString(PyExc_SystemError, \"invalid maximum character passed to PyUnicode_New\"); return NULL; } kind = PyUnicode_4BYTE_KIND; char_size = 4; if (sizeof(wchar_t) == 4) is_sharing = 1; } // size 不能小于 0 if (size < 0) { PyErr_SetString(PyExc_SystemError, \"Negative size passed to PyUnicode_New\"); return NULL; } // (size + 1) * char_size + struct_size 不能超过 PY_SSIZE_T_MAX if (size > ((PY_SSIZE_T_MAX - struct_size) / char_size - 1)) return PyErr_NoMemory(); // 为 Unicode 对象申请内存，如果返回 NULL 则说明申请失败 // 申请的内存不仅包含结构体本身，还有 size + 1 个字符，每个字符大小为 char_size // 从这里就体现出 \"紧凑\" 的含义了，因为结构体和字符串文本是结合的 obj = (PyObject *) PyObject_MALLOC(struct_size + (size + 1) * char_size); if (obj == NULL) return PyErr_NoMemory(); // 初始化引用计数和类型 obj = PyObject_INIT(obj, &PyUnicode_Type); if (obj == NULL) return NULL; // 将 obj 转成 PyCompactUnicodeObject * unicode = (PyCompactUnicodeObject *)obj; // 注：存储字符串文本的内存（可以理解为一个数组）紧跟在结构体后面 // 而下面的变量 data 会指向数组的首元素 // 那么问题来了，这是怎么做到的呢？我们解释一下，顺便回顾一下 C 的指针 // 假设有一个 int * 类型的指针 a，即 a 指向一个 int // 而 C 指针是可以运算的，a + 1 会指向下一个 int // 当然更准确的说，a + 1 会向后偏移 sizeof(int) 个字节 // 同理，如果 a 的类型是 ssize_t *，那么 a + 1 会向后偏移 sizeof(ssize_t) 个字节 if (is_ascii) // 此时我们就知道这里的代码是做什么的了，如果 is_ascii 等于 1 // 说明结构体是 PyASCIIObject，将泛型指针 obj 转成 PyASCIIObject * // 加 1 之后会向后偏移 sizeof(PyASCIIObject) 个字节 // 正好指向跟在 PyASCIIObject 结构体实例尾部的首个字符 data = ((PyASCIIObject*)obj) + 1; else // 否则说明结构体是 PyCompactUnicodeObject // 那么 unicode + 1 之后会向后偏移 sizeof(PyCompactUnicodeObject) 个字节 // 同样指向跟在 PyCompactUnicodeObject 结构体实例尾部的首个字符 data = unicode + 1; // 将 length 字段设置为 size _PyUnicode_LENGTH(unicode) = size; // 将 hash 字段初始化为 -1 _PyUnicode_HASH(unicode) = -1; // 将 state.interned 字段设置为 0 _PyUnicode_STATE(unicode).interned = 0; // 将 state.kind 字段设置为 kind _PyUnicode_STATE(unicode).kind = kind; // 将 state.compact 字段设置为 1 _PyUnicode_STATE(unicode).compact = 1; // 将 state.ready 字段设置为 1 _PyUnicode_STATE(unicode).ready = 1; // 将 state.ascii 字段设置为 is_ascii _PyUnicode_STATE(unicode).ascii = is_ascii; // 如果 is_ascii 等于 1，即字符串为 ASCII 字符串 // 将字符数组索引为 size 的元素设置为 '\\0' if (is_ascii) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; } // 否则说明结构体是 PyCompactUnicodeObject，还要多初始化两个字段 // 将 utf8 设置为 NULL，将 utf8_length 设置为 0 else if (kind == PyUnicode_1BYTE_KIND) { ((char*)data)[size] = 0; _PyUnicode_WSTR(unicode) = NULL; _PyUnicode_WSTR_LENGTH(unicode) = 0; unicode->utf8 = NULL; unicode->utf8_length = 0; } // 结构体是 PyCompactUnicodeObject，并且 kind 不等于 PyUnicode_1BYTE_KIND else { unicode->utf8 = NULL; unicode->utf8_length = 0; // 如果 kind 等于 PyUnicode_2BYTE_KIND，说明每个字符要占 2 字节 // 将 data 转成 Py_UCS2 *，此时会用两个字节存储 '\\0' if (kind == PyUnicode_2BYTE_KIND) ((Py_UCS2*)data)[size] = 0; // 否则说明 kind 等于 PyUnicode_4BYTE_KIND，每个字符要占 4 字节 // 将 data 转成 Py_UCS4 *，此时会用四个字节存储 '\\0' else ((Py_UCS4*)data)[size] = 0; if (is_sharing) { _PyUnicode_WSTR_LENGTH(unicode) = size; _PyUnicode_WSTR(unicode) = (wchar_t *)data; } else { _PyUnicode_WSTR_LENGTH(unicode) = 0; _PyUnicode_WSTR(unicode) = NULL; } }\n#ifdef Py_DEBUG unicode_fill_invalid((PyObject*)unicode, 0);\n#endif assert(_PyUnicode_CheckConsistency((PyObject*)unicode, 0)); // 最后返回泛型指针 PyObject * return obj;\n} 通过字符串的内存申请，我们应该对底层结构有了更深刻的认识，说白了就是采用不同的编码，每个字符占用不同数量的字节。 另外 PyUnicode_New 主要负责申请内存，包括结构体本身以及指定数量的字符，至于具体的字符是什么则不得而知。因此 PyUnicode_New 一般会被其它 API 调用，当调用 PyUnicode_New 申请完内存之后，再对字符数组初始化。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 字符串的内存申请","id":"129","title":"字符串的内存申请"},"13":{"body":"在前面的文章中我们说到，面向对象理论中的类和对象这两个概念在 Python 内部都是通过对象实现的。类是一种对象，称为类型对象，类实例化得到的也是对象，称为实例对象。但是对象在 Python 的底层是如何实现的呢？Python 解释器是基于 C 语言编写的 ，但 C 并不是一个面向对象的语言，那么它是如何实现 Python 的面向对象的呢？ 首先对于人的思维来说，对象是一个比较形象的概念，但对于计算机来说，对象却是一个抽象的概念。它并不能理解这是一个整数，那是一个字符串，计算机所知道的一切都是字节。通常的说法是：对象是数据以及基于这些数据所能进行的操作的集合。在计算机中，一个对象实际上就是一片被分配的内存空间，这些内存可能是连续的，也可能是离散的。 而 Python 的任何对象在 C 中都对应一个结构体实例，在 Python 中创建一个对象，等价于在 C 中创建一个结构体实例。所以 Python 的对象，其本质就是 C 的 malloc 函数为结构体实例在堆区申请的一块内存。 下面我们就来分析一下对象在 C 中是如何实现的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 楔子","id":"13","title":"楔子"},"130":{"body":"以上就是字符串的底层结构，虽然字符串作为最基础的数据结构被大量使用，但它的底层实现却并不简单。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"30. 解密字符串的底层结构，它是怎么实现的？ » 小结","id":"130","title":"小结"},"131":{"body":"上一篇文章我们介绍了字符串的底层结构，看到里面有一个 state 字段，该字段也是一个结构体，内部定义了很多的标志位。 如果字符串的 interned 标志位大于 0，那么虚拟机将为其开启 intern 机制。那什么是 intern 机制呢？在 Python 中，某些字符串也可以像小整数对象池里的整数一样，共享给所有变量使用，从而通过避免重复创建来降低内存使用、减少性能开销，这便是 intern 机制。 Python 的做法是在虚拟机内部维护一个全局字典，所有开启 intern 机制的字符串均会保存在这里，后续如果需要使用的话，会尝试在全局字典中获取，从而实现避免重复创建的功能。 另外 intern 机制也分为多种。 // Include/cpython/unicode.h\n#define SSTATE_NOT_INTERNED 0\n#define SSTATE_INTERNED_MORTAL 1\n#define SSTATE_INTERNED_IMMORTAL 2 解释一下这几个字段： SSTATE_NOT_INTERNED：字符串未开启 intern 机制； SSTATE_INTERNED_MORTAL：字符串开启了 intern 机制，但它不是永久驻留的，在某些情况下可能会被回收； SSTATE_INTERNED_IMMORTAL：字符串开启了 intern 机制，会永远存活于内存中； 这些字段定义了字符串在内存管理中的不同驻留状态，从未驻留、短暂驻留到永久驻留，帮助优化字符串的内存使用和管理。 而当一个字符串要开启 intern 机制时，会调用 PyUnicode_InternInPlace 函数，看一下它的逻辑。 // Objects/unicodeobject.c void\nPyUnicode_InternInPlace(PyObject **p)\n{ PyObject *s = *p; PyObject *t; // 类型检查，因为 intern 共享机制只能用在字符串对象上 // PyUnicode_Check(s) -> isinstance(s, str) // PyUnicode_CheckExact(s) -> type(s) is str if (s == NULL || !PyUnicode_Check(s)) return; if (!PyUnicode_CheckExact(s)) return; // 执行到这儿，说明 s 一定指向字符串，那么检测它是否已经开启了 intern 机制 // 这个函数的逻辑很简单，内部会获取 state.interned，看它是否大于 0 // 如果已经被 intern 机制处理了，那么直接返回 if (PyUnicode_CHECK_INTERNED(s)) return; // 所有开启 intern 机制的字符串，都会保存在 interned 字典中 // 如果 interned 字典为空，那么创建 if (interned == NULL) { interned = PyDict_New(); if (interned == NULL) { PyErr_Clear(); /* Don't leave an exception */ return; } } // 将字符串同时作为 key 和 value 保存在 interned 字典中，即开启 intern 机制 // PyDict_SetDefault 对应字典的 setdefault 方法 t = PyDict_SetDefault(interned, s, s); if (t == NULL) { PyErr_Clear(); return; } // 注意这里有一个让人混淆的地方，首先 t 和 s 都是 C 指针 // 如果 t != s，说明它们指向了不同的字符串，如果 t == s，说明它们指向的是同一个字符串 // 由于 s 同时作为 key 和 value，那么不管 s 指向的字符串是否在字典中已存在 // PyObject_RichCompare(t, s, Py_EQ) 永远为真，也就是 t 和 s 指向的字符串的值是相等的 // 只是当 t != s 时，说明它们指向的不是同一个字符串，但值相等 // 这也意味着字典中已经存在某个 key，它指向的字符串维护了相同的文本数据 // 那么增加 t 指向的字符串的引用计数，减少 s 指向的字符串的引用计数 if (t != s) { Py_INCREF(t); Py_SETREF(*p, t); return; } // 否则说明 t == s，即 s 在字典中不存在，那么开启 interned 机制 Py_REFCNT(s) -= 2; _PyUnicode_STATE(s).interned = SSTATE_INTERNED_MORTAL;\n} 估计很多人都以为 Python 在创建字符串时，会先检测该字符串是否已经存在，如果有，就不用创建新的，这样可以节省空间。但其实不是这样的，事实上节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。 对于任何一个字符串，Python 总是会为它申请内存，尽管创建出来的字符串在 interned 字典中已经存在了（有另外的字符串对象维护了相同的文本）。而这正是关键所在，通常 Python 在运行时创建了一个字符串对象（假设叫 temp）之后，基本上都会调用 PyUnicode_InternInPlace 对 temp 进行处理。 如果维护的值已经存在于 interned 字典中，那么 temp 指向的对象的引用计数就会减 1，然后会因引用计数为 0 而被销毁，只是昙花一现，然后归于湮灭。 所以现在我们就明白了 intern 机制，并不是说先判断是否存在，如果存在，就不创建。而是先创建，然后发现已经有其它的字符串维护了一个与之相同的文本数据，于是 intern 机制再将引用计数减一，导致引用计数为 0，最终被回收。 然后关于字符串对象的 intern 机制，还有一点需要注意。实际上，被 intern 机制处理过后的字符串分为两类，一类处于 SSTATE_INTERNED_IMMORTAL 状态，另一类处于 SSTATE_INTERNED_MORTAL 状态，这两种状态的区别在 unicode_dealloc 中可以清晰的看到。SSTATE_INTERNED_IMMORTAL 状态的字符串是永远不会被销毁的，它与解释器共存亡。 而 PyUnicode_InternInPlace 只能创建 SSTATE_INTERNED_MORTAL 的字符串对象，如果想创建 SSTATE_INTERNED_IMMORTAL 对象，必须通过另外的接口来强制改变 intern 状态。 void\nPyUnicode_InternImmortal(PyObject **p)\n{ PyUnicode_InternInPlace(p); if (PyUnicode_CHECK_INTERNED(*p) != SSTATE_INTERNED_IMMORTAL) { _PyUnicode_STATE(*p).interned = SSTATE_INTERNED_IMMORTAL; Py_INCREF(*p); }\n} 但是问题来了，什么样的字符串才会开启 intern 机制呢？ 1）如果字符串为 ASCII 字符串，并且长度不超过 4096，那么会开启 intern 机制。 >>> s1 = \"a\" * 4096\n>>> s2 = \"a\" * 4096\n# 会开启 intern 机制，s1 和 s2 指向同一个字符串\n>>> s1 is s2\nTrue # 长度超过了 4096，所以不会开启 intern 机制\n>>> s1 = \"a\" * 4097\n>>> s2 = \"a\" * 4097\n>>> s1 is s2\nFalse 2）如果一个字符串只有一个字符，并且码点小于 256（一个字节可以表示），那么也会开启 intern 机制。 >>> hex(128)\n'0x80'\n# s1 和 s2 指向同一个字符串，因为开启了 intern 机制\n>>> s1 = chr(128)\n>>> s2 = \"\\x80\"\n>>> s1 is s2\nTrue # ASCII 字符指的是码点小于 128 的字符，显然 s1 和 s2 不是 ASCII 字符串\n# 虽然码点小于 256，但长度不等于 1，所以不会开启 intern 机制\n>>> s1 = chr(128) + \"x\"\n>>> s2 = chr(128) + \"x\"\n>>> s1 is s2\nFalse 实际上，存储单个字符这种方式有点类似于 bytes 对象的缓存池。是的，正如整数有小整数对象池、bytes 对象有字符缓存池一样，字符串也有其对应的缓存池。 总之 intern 机制并不是大家想的那样：先检测字符串是否已经存在，如果有，就不用创建新的，从而节省内存。但其实不是这样的，节省内存空间是没错的，可 Python 并不是在创建字符串的时候就通过 intern 机制实现了节省空间的目的。对于任何一个字符串，解释器总是会为它创建对应的结构体实例，但如果发现创建出来的实例在 intern 字典中已经存在了，那么再将它销毁。 最后关于 intern 机制，在 Python 里面可以通过 sys.intern 函数强制开启。 >>> s1 = \"憨pi-_-||\"\n>>> s2 = \"憨pi-_-||\"\n>>> s1 is s2\nFalse\n>>> >>> s1 = sys.intern(\"憨pi-_-||\")\n>>> s2 = sys.intern(\"憨pi-_-||\")\n>>> s1 is s2\nTrue 以上就是字符串的 intern 机制，下一篇文章来介绍字符串的相关操作是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"31. 字符串的 intern 机制是怎么一回事？","id":"131","title":"31. 字符串的 intern 机制是怎么一回事？"},"132":{"body":"本文来说一说字符串的操作，字符串支持哪些操作，取决于类型对象 str，所以我们来看看 str 在底层的定义。 // Objects/unicodeobject.c\nPyTypeObject PyUnicode_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"str\", /* tp_name */ sizeof(PyUnicodeObject), /* tp_basicsize */ 0, /* tp_itemsize */ /* Slots */ (destructor)unicode_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ unicode_repr, /* tp_repr */ &unicode_as_number, /* tp_as_number */ &unicode_as_sequence, /* tp_as_sequence */ &unicode_as_mapping, /* tp_as_mapping */ // ...\n} bytes 对象和 str 对象的很多行为都是相似的，str 对象可以 encode 成 bytes 对象，bytes 对象可以 decode 成 str 对象。 看一下三个操作簇，字符串都支持，但根据 bytes 对象的经验，我们猜测 tp_as_number 里面实现的函数只有取模，也就是格式化。 // Objects/unicodeobject.c // 不出所料，只实现了一个取模\nstatic PyNumberMethods unicode_as_number = { 0, /*nb_add*/ 0, /*nb_subtract*/ 0, /*nb_multiply*/ unicode_mod, /*nb_remainder*/\n}; // 我们看到和 bytes 对象是几乎一样的\n// 因为 str 对象和 bytes 都是不可变的变长对象，并且可以相互转化\n// 因此它们的行为是高度相似的\nstatic PySequenceMethods unicode_as_sequence = { (lenfunc) unicode_length, /* sq_length */ PyUnicode_Concat, /* sq_concat */ (ssizeargfunc) unicode_repeat, /* sq_repeat */ (ssizeargfunc) unicode_getitem, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyUnicode_Contains, /* sq_contains */\n}; //也和 bytes 对象一样\nstatic PyMappingMethods unicode_as_mapping = { (lenfunc)unicode_length, /* mp_length */ (binaryfunc)unicode_subscript, /* mp_subscript */ (objobjargproc)0, /* mp_ass_subscript */\n}; 下面我们就通过源码来考察一下。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 楔子","id":"132","title":"楔子"},"133":{"body":"获取字符串的长度会执行 unicode_length 函数。 // Objects/unicodeobject.c\nstatic Py_ssize_t\nunicode_length(PyObject *self)\n{ if (PyUnicode_READY(self) == -1) return -1; return PyUnicode_GET_LENGTH(self);\n} // Include/cpython/unicodeobject.h\n#define PyUnicode_GET_LENGTH(op) \\ (assert(PyUnicode_Check(op)), \\ assert(PyUnicode_IS_READY(op)), \\ ((PyASCIIObject *)(op))->length) 比较简单，没什么可说的，length 字段维护的是字符串的长度。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 获取字符串的长度","id":"133","title":"获取字符串的长度"},"134":{"body":"字符串相加会执行 PyUnicode_Concat 函数，将两个字符串组合成一个新的字符串。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Concat(PyObject *left, PyObject *right)\n{ // 参数 left 和 right 指向两个要相加的字符串 // result 则指向相加之后的字符串 PyObject *result; // 还记得这个 Py_UCS4 吗，它是一个无符号 32 位整型 Py_UCS4 maxchar, maxchar2; // left 的长度、right 的长度、相加之后的长度 Py_ssize_t left_len, right_len, new_len; // 必须是两个字符串相加 if (ensure_unicode(left) < 0) return NULL; if (!PyUnicode_Check(right)) { PyErr_Format(PyExc_TypeError, \"can only concatenate str (not \\\"%.200s\\\") to str\", right->ob_type->tp_name); return NULL; } if (PyUnicode_READY(right) < 0) return NULL; // 如果 left 指向空字符串，直接返回 right if (left == unicode_empty) return PyUnicode_FromObject(right); // 如果 right 指向空字符串，直接返回 left if (right == unicode_empty) return PyUnicode_FromObject(left); // 获取两个字符串的长度 left_len = PyUnicode_GET_LENGTH(left); right_len = PyUnicode_GET_LENGTH(right); // 如果相加的之后的长度超过了 PY_SSIZE_T_MAX，那么报错 if (left_len > PY_SSIZE_T_MAX - right_len) { PyErr_SetString(PyExc_OverflowError, \"strings are too large to concat\"); return NULL; } // 计算相加之后的字符串的长度 new_len = left_len + right_len; // 解释一下 PyUnicode_MAX_CHAR_VALUE，它的逻辑很简单 /* 如果是 ASCII 字符串，返回 0x7f * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0xff * 如果 kind 等于 PyUnicode_2BYTE_KIND，返回 0xffff * 如果 kind 等于 PyUnicode_1BYTE_KIND，返回 0x10ffff */ // 所以该函数计算的就是字符串使用的编码所能表示的最大范围 maxchar = PyUnicode_MAX_CHAR_VALUE(left); maxchar2 = PyUnicode_MAX_CHAR_VALUE(right); // 显然要取 maxchar 和 maxchar2 之间两者较大的那一个 maxchar = Py_MAX(maxchar, maxchar2); // PyUnicode_New 我们之前介绍过，它负责为字符串申请内存 // new_len 表示要容纳多少个字符 // maxchar 表示字符的最大码点，内部会基于 maxchar 选择一个合适的编码 result = PyUnicode_New(new_len, maxchar); if (result == NULL) return NULL; // _PyUnicode_FastCopyCharacters 负责字符串之间的拷贝，它的原型如下： /* void _PyUnicode_FastCopyCharacters(PyObject *to, Py_ssize_t to_start, PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many) 如果用 Python 代码举例的话，那么该函数所做的事情就等价于如下： for i in range(how_many): to[to_start + i] = from[from_start + i] */ // 相当于 result[0: left_len] = left[0: left_len] _PyUnicode_FastCopyCharacters(result, 0, left, 0, left_len); // 相当于 result[left_len: left_len + right_len] = right[0: right_len] _PyUnicode_FastCopyCharacters(result, left_len, right, 0, right_len); assert(_PyUnicode_CheckConsistency(result, 1)); return result;\n} 可以看到逻辑还是很清晰的，不过和 bytes 对象不同，字符串没有实现缓冲区。但是在操作上，和 bytes 对象是类似的，如果有大量的字符串相加，那么效率会非常低下，官方建议是通过 join 的方式。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的相加","id":"134","title":"字符串的相加"},"135":{"body":"序列型对象除了拥有 tp_as_sequence 里面的方法之外，还可以有很多自定义方法，比如字符串可以转大小写，列表可以追加元素等等。下面来聊一聊字符串的自定义方法，在介绍类型对象的时候说过，实例对象的自定义方法都会放在类型对象的 tp_methods 字段里面。 tp_methods 字段的类型是 PyMethodDef 结构体数组，一个 PyMethodDef 结构体实例对应一个可调用方法。那么 PyMethodDef 长什么样子呢？ // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 包含具体实现的 C 函数 PyCFunction ml_meth; // 函数的参数类型 // 比如函数接收多少参数，是否支持关键字参数， // 是不是静态方法、类方法等等，这些都需要通过 ml_flags 指定 int ml_flags; // 函数的 docstring const char *ml_doc; }; 字符串的自定义方法非常多，我们先从 Python 的角度罗列一下，然后再挑几个看一下源码实现。 # 字符串转小写\nprint(\"ABC\".lower()) # abc # 字符串转大写\nprint(\"abc\".upper()) # ABC # 每个单词首字母大写，其它字母小写\nprint(\"my GRIL\".title()) # My Gril # 第一个单词首字母大写，其它字母小写\nprint(\"MY GIRL\".capitalize()) # My girl # 从字符两端开始去除指定的字符，比如位于 \"001\" 的字符会被去除\nprint(\"001古明地觉 1 号001\".strip(\"001\")) # 古明地觉 1 号\n# 也可以只从一端去除\nprint(\"001古明地觉 1 号001\".lstrip(\"001\")) # 古明地觉 1 号001\nprint(\"001古明地觉 1 号001\".rstrip(\"001\")) # 001古明地觉 1 号 # 查找指定的子串，返回子串第一次出现的位置\nprint(\"abcabcabc\".index(\"bca\")) # 1\n# 查找时也支持指定范围，比如从索引为 2 的位置开始查找\nprint(\"abcabcabc\".index(\"bca\", 2)) # 4 # index 方法如果在没有找到指定的子串时，会抛出 ValueError:\n# 如果不希望报错，那么可以使用 find，当字符串不存在时会返回 -1\nprint(\"hello\".find(\"ll\")) # 2\nprint(\"hello\".find(\"lll\")) # -1\n# find 也支持指定查找范围，并且是从左往右查找\n# 如果使用 rfind，则可以实现从右往左查找，同理还有 rindex\nprint(\"abc abc\".find(\"abc\")) # 0\nprint(\"abc abc\".rfind(\"abc\")) # 4 # 统计指定子串的数量\nprint(\"abc abc abc\".count(\"abc\")) # 3 # 是否以某个字符串开头\nprint(\"Hello\".startswith(\"Hel\")) # True\nprint(\"Hello\".startswith(\"hel\")) # False # 是否以某个字符串结尾\nprint(\"world\".endswith(\"rld\")) # True\nprint(\"world\".endswith(\"rlD\")) # False # 按照指定字符串进行分割，并支持传入 maxsplit 参数指定最大分割次数\nprint(\"a-b-c-d-e\".split(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".split(\"-\", 2)) # ['a', 'b', 'c-d-e']\n# 如果不传递参数，那么会默认按照空白符（包含空格、Tab、换行等等）分隔\nprint(\"a \\n b \\tc\".split()) # ['a', 'b', 'c']\n# 还可以从右向左分割，当然在不指定 maxsplit 参数时，效果和 split 一样\nprint(\"a-b-c-d-e\".rsplit(\"-\")) # ['a', 'b', 'c', 'd', 'e']\nprint(\"a-b-c-d-e\".rsplit(\"-\", 2)) # ['a-b-c', 'd', 'e'] # 等价于 .split(\"\\n\")\nprint(\"a b\\nc\".splitlines()) # ['a b', 'c'] # 按照指定子串进行分割，返回一个三元组：(子串之前的部分, 子串, 子串之后的部分)\nprint(\"abcxxdef\".partition(\"xx\")) # ('abc', 'xx', 'def')\n# 当子串不存在时，会返回 (字符串本身, \"\"， \"\")\nprint(\"abc\".partition(\"xx\")) # ('abc', '', '') # 大小写交换\nprint(\"Hello World\".swapcase()) # hELLO wORLD # 对指定子串进行替换\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\")) # ABC ABC ABC\n# 也可以指定最大替换次数\nprint(\"abc abc abc\".replace(\"abc\", \"ABC\", 2)) # ABC ABC abc # 和 replace 作用相似，也是用来替换字符串指定部分\n# 将 a 替换成 abc，将 x 替换成 xyz\ntrans = str.maketrans({\"a\": \"abc\", \"x\": \"xyz\"})\nprint(\"aaxx\".translate(trans)) # abcabcxyzxyz\n# 如果给 str.maketrans 只传一个参数，那么要传字典，并且 key 必须是单字符\n# 如果给 str.maketrans 传递两个参数，那么两个参数必须是等长的字符串\ntrans = str.maketrans(\"abc\", \"ABC\")\n# a -> A，b -> B，c -> C\nprint(\"abccc\".translate(trans)) # ABCCC\n# 如果传三个参数，那么第三个参数也要是字符串\n# 此时在替换的时候，还会去除掉位于 \"def\" 中的字符\ntrans = str.maketrans(\"abc\", \"ABC\", \"def\")\nprint(\"abcdefabc\".translate(trans)) # ABCABC 这些都属于基础内容了，我们挑几个看一下源码实现。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的自定义方法","id":"135","title":"字符串的自定义方法"},"136":{"body":"字符串在相加时会创建一个新的字符串，所以如果有大量的字符串相加，那么效率会很低下。面对这种情况，官方的建议是通过 join 方法。 字符串的 join 方法在底层对应 PyUnicode_Join 函数。 // Objects/unicodeobject.c\nPyObject *\nPyUnicode_Join(PyObject *separator, PyObject *seq)\n{ PyObject *res; // 拼接结果 PyObject *fseq; // 拼接的字符串的数量 Py_ssize_t seqlen; // 总长度 PyObject **items; // PyObject * 数组首元素的地址 // 遍历参数 seq，将里面的每个字符串拿出来放在列表中 // 如果 seq 本身就是列表或元组，那么直接返回 seq fseq = PySequence_Fast(seq, \"can only join an iterable\"); if (fseq == NULL) { return NULL; } // 列表或元组对应的结构体内部都有一个 ob_item 字段 // 该字段是一个 PyObject * 类型的数组，负责保存具体的元素 // 该函数会拿到 ob_item 数组，并赋值给 items items = PySequence_Fast_ITEMS(fseq); // 获取要拼接的字符串的数量 seqlen = PySequence_Fast_GET_SIZE(fseq); // 调用 _PyUnicode_JoinArray 进行拼接 res = _PyUnicode_JoinArray(separator, items, seqlen); Py_DECREF(fseq); return res;\n} 核心在 _PyUnicode_JoinArray 函数里面，该函数的逻辑很长，但很简单。就是获取要拼接的每一个字符串的长度，然后加在一起，并取最大的存储单元，然后一次性申请对应的内存空间，再逐一进行拷贝。所以拷贝是避免不了的，+ 这种方式导致低效率的主要原因就在于大量临时字符串的创建和销毁。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 join","id":"136","title":"字符串的 join"},"137":{"body":"在 Python 里面可以调用字符串的 encode 方法，得到 bytes 对象。那么它在底层是如何实现的呢？ // Objects/unicodeobject.c\nPyObject *\nPyUnicode_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors)\n{ PyObject *v; char buflower[11]; // unicode 参数要指向一个字符串 if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } // 如果不指定编码，那么使用 UTF-8 if (encoding == NULL) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果指定了编码，那么进行判断 if (_Py_normalize_encoding(encoding, buflower, sizeof(buflower))) { char *lower = buflower; /* Fast paths */ // 快分支，判断是否是 UTF-* 系列 if (lower[0] == 'u' && lower[1] == 't' && lower[2] == 'f') { lower += 3; if (*lower == '_') { /* Match \"utf8\" and \"utf_8\" */ lower++; } // 如果是 UTF-8 if (lower[0] == '8' && lower[1] == 0) { return _PyUnicode_AsUTF8String(unicode, errors); } // 如果是 UTF-16 else if (lower[0] == '1' && lower[1] == '6' && lower[2] == 0) { return _PyUnicode_EncodeUTF16(unicode, errors, 0); } // 如果是 UTF-32 else if (lower[0] == '3' && lower[1] == '2' && lower[2] == 0) { return _PyUnicode_EncodeUTF32(unicode, errors, 0); } } // 否则判断是否是 ascii、latin1、iso8859-1 等编码 else { if (strcmp(lower, \"ascii\") == 0 || strcmp(lower, \"us_ascii\") == 0) { return _PyUnicode_AsASCIIString(unicode, errors); }\n#ifdef MS_WINDOWS else if (strcmp(lower, \"mbcs\") == 0) { return PyUnicode_EncodeCodePage(CP_ACP, unicode, errors); }\n#endif else if (strcmp(lower, \"latin1\") == 0 || strcmp(lower, \"latin_1\") == 0 || strcmp(lower, \"iso_8859_1\") == 0 || strcmp(lower, \"iso8859_1\") == 0) { return _PyUnicode_AsLatin1String(unicode, errors); } } } // 如果以上编码都不是，那么执行通用逻辑 _PyCodec_EncodeText v = _PyCodec_EncodeText(unicode, encoding, errors); if (v == NULL) return NULL; /* The normal path */ if (PyBytes_Check(v)) return v; /* If the codec returns a buffer, raise a warning and convert to bytes */ if (PyByteArray_Check(v)) { int error; PyObject *b; error = PyErr_WarnFormat(PyExc_RuntimeWarning, 1, \"encoder %s returned bytearray instead of bytes; \" \"use codecs.encode() to encode to arbitrary types\", encoding); if (error) { Py_DECREF(v); return NULL; } b = PyBytes_FromStringAndSize(PyByteArray_AS_STRING(v), PyByteArray_GET_SIZE(v)); Py_DECREF(v); return b; } PyErr_Format(PyExc_TypeError, \"'%.400s' encoder returned '%.400s' instead of 'bytes'; \" \"use codecs.encode() to encode to arbitrary types\", encoding, Py_TYPE(v)->tp_name); Py_DECREF(v); return NULL;\n} 由于现在的主流编码是 utf-8，所以绝大部分情况都会执行 _PyUnicode_AsUTF8String 函数，我们看一下它的逻辑。 // Objects/unicodeobject.c\nPyObject *\n_PyUnicode_AsUTF8String(PyObject *unicode, const char *errors)\n{ return unicode_encode_utf8(unicode, _Py_ERROR_UNKNOWN, errors);\n} static PyObject *\nunicode_encode_utf8(PyObject *unicode, _Py_error_handler error_handler, const char *errors)\n{ enum PyUnicode_Kind kind; void *data; Py_ssize_t size; if (!PyUnicode_Check(unicode)) { PyErr_BadArgument(); return NULL; } if (PyUnicode_READY(unicode) == -1) return NULL; // 如果是 ASCII 字符串，那么直接获取每个字符的码点，创建 bytes 对象 if (PyUnicode_UTF8(unicode)) return PyBytes_FromStringAndSize(PyUnicode_UTF8(unicode), PyUnicode_UTF8_LENGTH(unicode)); // 获取字符串的 kind kind = PyUnicode_KIND(unicode); // 获取首字符的地址，首字符紧跟在结构体后面 data = PyUnicode_DATA(unicode); // 获取字符串的长度 size = PyUnicode_GET_LENGTH(unicode); // 判断 kind 种类 switch (kind) { default: Py_UNREACHABLE(); case PyUnicode_1BYTE_KIND: // 基于不同 kind 调用不同的函数 assert(!PyUnicode_IS_ASCII(unicode)); return ucs1lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_2BYTE_KIND: return ucs2lib_utf8_encoder(unicode, data, size, error_handler, errors); case PyUnicode_4BYTE_KIND: return ucs4lib_utf8_encoder(unicode, data, size, error_handler, errors); }\n} 整个过程还是我们之前说的，通过 utf-8 编码将每个字符转成对应的编号，组合起来得到的就是 bytes 对象。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 字符串的 encode","id":"137","title":"字符串的 encode"},"138":{"body":"到目前为止，我们就说完了字符串相关的内容。必须要强调的是，字符串没有想象中的那么简单，而在 CPython 里面，字符串的源码将近两万行。 如果你还对字符串的其它操作感兴趣，想看看它的具体实现，可以自己深入源码探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"32. 聊一聊字符串常见操作的源码实现 » 小结","id":"138","title":"小结"},"139":{"body":"本篇文章来分析一下列表，在初学列表的时候，可能书上会告诉你列表就是一个大仓库，什么都可以存放。但在最开始的几个章节中，我们花了很大的笔墨介绍了 Python 的对象，并明白了变量的本质。所以到现在列表已经没有什么好神秘的了，它里面存放的元素其实都是泛型指针 PyObject *。 并且根据我们使用列表的经验，可以得出以下两个结论： 每个列表的元素个数可以不一样，所以它是一个变长对象 可以对列表进行添加、删除、修改等操作，所以它是一个可变对象","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 楔子","id":"139","title":"楔子"},"14":{"body":"Python 一切皆对象，而所有的对象都拥有一些共同的信息（也叫头部信息），这些信息位于 PyObject 中，它是 Python 对象机制的核心，下面来看看它的定义。 // Include/object.h typedef struct _object { _PyObject_HEAD_EXTRA Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 首先解释一下结构体里面的 _PyObject_HEAD_EXTRA，这是一个宏，定义如下。 // Include/object.h // 如果定义了宏 Py_TRACE_REFS\n#ifdef Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 会展开成如下两个字段\n// 显然程序中创建的对象会组成一个双向链表\n#define _PyObject_HEAD_EXTRA \\ struct _object *_ob_next; \\ struct _object *_ob_prev;\n// 用于将 _ob_next 和 _ob_prev 初始化为空\n#define _PyObject_EXTRA_INIT 0, 0,\n// 否则说明没有定义宏 Py_TRACE_REFS\n// 那么 _PyObject_HEAD_EXTRA 和 _PyObject_EXTRA_INIT 不会有任何作用\n#else\n#define _PyObject_HEAD_EXTRA\n#define _PyObject_EXTRA_INIT\n#endif 所以如果定义了宏 Py_TRACE_REFS，那么展开之后 PyObject 就是下面这样。 typedef struct _object { PyObject *_ob_next; PyObject *_ob_prev; Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 但 Py_TRACE_REFS 一般只在编译调试的时候会开启，我们从官网下载的都是 Release 版本，不包含这个宏，因此这里我们也不考虑它。所以 PyObject 最终就等价于下面这个样子： typedef struct _object { Py_ssize_t ob_refcnt; struct _typeobject *ob_type;\n} PyObject; 所以 PyObject 里面包含了两个字段，分别是 ob_refcnt 和 ob_type。 ob_refcnt 表示对象的引用计数，当对象被引用时，ob_refcnt 会自增 1；引用解除时，ob_refcnt 会自减 1。而当对象的引用计数为 0 时，则会被回收。 那么在哪些情况下，引用计数会加 1 呢？哪些情况下，引用计数会减 1 呢？ 引用计数加 1 的情况： 对象被创建：比如 name = \"古明地觉\"，此时对象就是 \"古明地觉\" 这个字符串，创建成功时它的引用计数为 1； 变量传递使得对象被新的变量引用：比如 name2 = name； 引用该对象的某个变量作为参数传递到一个函数或者类中：比如 func(name)； 引用该对象的某个变量作为元组、列表、集合等容器的元素：比如 lst = [name]； 引用计数减 1 的情况： 引用该对象的变量被显式地销毁：del name； 引用该对象的变量指向了别的对象：name = \"\"； 引用该对象的变量离开了它的作用域，比如函数的局部变量在函数执行完毕时会被删除； 引用该对象的变量所在的容器被销毁，或者变量从容器里面被删除； 因为变量只是一个和对象绑定的符号，更接地气一点的说法就是，变量是个便利贴，贴在指定的对象上面。所以 del 变量 并不是删除变量指向的对象，而是删除变量本身，可以理解为将对象身上的便利贴给撕掉了，其结果就是对象的引用计数减一。至于对象是否被删除（回收）则是解释器判断其引用计数是否为 0 决定的，为 0 就删，不为 0 就不删，就这么简单。 然后看一下字段 ob_refcnt 的类型，该类型为 Py_ssize_t，它是 ssize_t 的别名，在 64 位机器上等价于 int64。因此一个对象的引用计数不能超过 int64 所能表示的最大范围。但很明显，如果不费九牛二虎之力去写恶意代码，是不可能超过这个范围的。 说完了 ob_refcnt，再来看看 PyObject 的另一个字段 ob_type，相信你能猜到它的含义。对象是有类型的，类型对象描述实例对象的行为，而 ob_type 存储的便是对应的类型对象的指针，所以类型对象在底层是一个 struct _typeobject 结构体实例。另外 struct _typeobject 还有一个类型别名叫 PyTypeObject，关于类型对象，我们后续再聊。 以上就是 PyObject，它的定义非常简单，就一个引用计数和一个类型对象的指针。这两个字段的大小都是 8 字节，所以一个 PyObject 结构体实例的大小是 16 字节。由于 PyObject 是所有对象都具有的，换句话说就是所有对象对应的结构体都内嵌了 PyObject，因此你在 Python 里面看到的任何一个对象都有引用计数和类型这两个属性。 >>> num = 666 >>> sys.getrefcount(num)\n2\n>>> num.__class__\n<class 'int'> >>> sys.getrefcount(sys)\n56\n>>> sys.__class__\n<class 'module'> >>> sys.getrefcount(sys.path)\n2\n>>> sys.path.__class__\n<class 'list'> >>> def foo(): pass\n... >>> sys.getrefcount(foo)\n2\n>>> foo.__class__\n<class 'function'> 引用计数可以通过 sys.getrefcount 函数查看，类型可以通过 type(obj) 或者 obj.__class__ 查看。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 对象的地基：PyObject","id":"14","title":"对象的地基：PyObject"},"140":{"body":"列表在底层由 PyListObject 结构体表示，看一下它长什么样子。 // Include/listobject.h\ntypedef struct { PyObject_VAR_HEAD /* Vector of pointers to list elements. list[0] is ob_item[0], etc. */ PyObject **ob_item; /* ob_item contains space for 'allocated' elements. The number * currently in use is ob_size. * Invariants: * 0 <= ob_size <= allocated * len(list) == ob_size * ob_item == NULL implies ob_size == allocated == 0 * list.sort() temporarily sets allocated to -1 to detect mutations. * * Items must normally not be NULL, except during construction when * the list is not yet visible outside the function that builds it. */ Py_ssize_t allocated;\n} PyListObject; 我们看到里面有如下字段： PyObject_VAR_HEAD：变长对象的公共头部信息； ob_item：一个二级指针，指向 PyObject * 数组的首元素，这个指针数组保存的便是对象的指针，而操作数组都是通过 ob_item 来进行操作的； allocated：容量，我们知道列表底层使用了 C 的数组，而底层数组的长度就是列表的容量； 列表之所以要有容量的概念，是因为列表可以动态添加元素，但底层的数组在创建完毕之后，其长度却是固定的。所以当添加新元素时，发现数组已经满了，这个时候只能申请一个更长的数组，同时把原来数组中的元素依次拷贝到新数组里面（这一过程就是列表的扩容），然后再将新元素添加进去。 但是问题来了，总不可能每添加一个元素，就申请一次数组、将所有元素都拷贝一次吧。所以列表在扩容的时候，会将数组申请的长一些，从而在添加元素的时候不用每次都申请新的数组。 这便是列表的结构示意图，我们看到底层数组的长度为 4，说明此时列表的容量为 4。但是里面有 3 个 PyObject * 指针，说明列表的 ob_size 是 3，或者说列表里面有 3 个元素。 如果这个时候我们往列表中 append 一个元素，那么会将这个新元素设置在数组索引为 ob_size 的位置、或者说第四个位置。一旦设置完，ob_size 会自动加 1，因为 ob_size 要和列表的长度保持一致。 列表的容量是 4，但此时长度也达到了 4，所以列表的长度、或者说元素个数已经达到了容量。这说明当下一次 append 的时候，已经没有办法再容纳新的元素了。当然最直观的还是这里的底层数组，很明显全都占满了。那这个时候如果想再接收新的元素的话，要怎么办呢？显然只能扩容了。 原来的容量是 4，长度也是 4，当再来一个新元素的时候由于没有位置了，所以要扩容。但扩容的时候肯定会将容量申请的大一些、即底层数组申请的长一些，具体申请多长，Python 内部有一个公式，我们后面会说。总之申请的新的底层数组长度是 8，那么说明列表的容量就变成了 8。 新数组申请之后，将原来旧数组中的 PyObject * 按照顺序依次拷贝过去，再让 ob_item 指向新数组。然后把要添加的元素设置在新数组中索引为 ob_size 的位置、即第 5 个位置，并将 ob_size 加 1。最后将旧数组释放掉。 以上便是列表底层在扩容的时候所经历的过程。 由于扩容会申请新数组，然后将旧数组的元素拷贝到新数组中，所以这是一个时间复杂度为 O(n) 的操作。而 append 可能会导致列表扩容，因此 append 最坏情况下也是一个 O(n) 的操作，只不过扩容不会频繁发生，所以 append 方法的平均时间复杂度还是 O(1)。 另外我们还可以看到一个现象，那就是列表在底层是分开存储的，因为 PyListObject 结构体实例并没有存储相应的指针数组，而是存储了指向这个指针数组首元素的二级指针。显然我们添加、删除、修改元素等操作，都是通过 ob_item 二级指针来间接操作指针数组。 至于这么做的原因，我们在介绍 Python 对象的时候就说过了，不记得了的话，可以回去翻一翻。 所以底层对应的 PyListObject 实例的大小其实是不变的，因为指针数组没有存在 PyListObject 里面。但 Python 在计算内存大小的时候是会将这个指针数组也算进去的，所以列表的大小是可变的。 而且我们知道，列表在 append 之后地址是不变的，至于原因上面的几张图已经解释得很清楚了。 如果长度没有达到容量，那么 append 其实就是往底层数组中设置了一个新元素。如果达到容量了，那么会扩容，但扩容只是申请一个新的指针数组，然后让 ob_item 重新指向罢了。所以底层的指针数组会变，但是 PyListObject 结构体实例本身是没有变化的，因此列表在执行 append、extend、pop、insert 等操作时，地址不会发生变化。 下面再来看看列表所占的内存大小是怎么算的，首先 PyListObject 里面的 PyObject_VAR_HEAD 占 24 字节，ob_item 占 8 字节，allocated 占 8 字节，总共 40 字节。但是不要忘记，在计算列表大小的时候，ob_item 指向的指针数组也要算在内。所以：列表的大小 = 40 + 8 * 指针数组长度（或者说列表容量）。注意是指针数组长度，可不是列表长度，因为数组一旦申请了，不管你用没用，大小就摆在那里了。就好比你租了间房子，就算不住，房租该交还是得交。 # 显然一个空数组占 40 个字节\nprint([].__sizeof__()) # 40 # 40 + 3 * 8 = 64\nprint([1, 2, \"x\" * 1000].__sizeof__()) # 64\n# 虽然里面有一个长度为 1000 的字符串\n# 但我们说列表存放的都是指针，所以大小都是 8 字节 # 注意：我们通过 lst = [1, 2, 3] 这种方式创建列表的话\n# 不管内部元素有多少个, 其 ob_size 和 allocated 都是一样的\n# 只有当列表在添加元素的时候发现容量不够了才会扩容\nlst = list(range(10))\n# 40 + 10 * 8 = 120\nprint(lst.__sizeof__()) # 120 # 长度为 4，此时容量也是 4\nlst = [\"巭\", \"孬\", \"嫑\", \"睡觉\"]\n# 大小为 40 + 4 * 8 = 72\nprint(lst.__sizeof__()) # 72\n# 添加一个元素\nlst.append(\"觉得睡啊\")\n# 大小变成了 40 + 8 * 8 = 104\n# 说明当发生扩容时，底层数据可以容纳 8 个元素\nprint(lst.__sizeof__()) # 104 关于列表的长度和容量的关系，以及扩容的规则，我们后续再聊。总之目前我们知道列表的大小是怎么计算的，以及为什么列表在通过索引定位元素的时候，时间复杂度是 O(1)。因为列表存储的都是对象的指针，不管对象有多大，其指针大小是固定的，都是 8 字节，通过索引可以瞬间计算出偏移量。 print([1, 2, 3].__sizeof__()) # 64\nprint([[1, 2, 3]].__sizeof__()) # 48 相信上面这个结果，你肯定能分析出原因。因为第一个列表中有 3 个指针，所以大小是 40 + 24 = 64。而第二个列表中有一个指针，所以是 40 + 8 = 48。用一张图来展示一下 [1, 2, 3] 和 [[1, 2, 3]] 的底层结构，看看它们之间的区别： 到此相信你已经彻底掌握列表的结构了，那么下一篇文章我们来介绍一下列表的长度和容量之间的关系，以及扩容是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"33. 列表是怎么实现的？解密列表的数据结构 » 列表的底层结构","id":"140","title":"列表的底层结构"},"141":{"body":"本篇文章来说一说列表的扩容，我们知道列表在添加元素时，如果发现底层的指针数组已经满了，那么会进行扩容，申请一个更大的数组。 下面就来看看底层是怎么实现的，相关操作都位于 Objects/listobject.c 中。 static int\nlist_resize(PyListObject *self, Py_ssize_t newsize)\n{ // 参数 self 就是列表，newsize 指的是元素在添加之后的 ob_size // 比如列表的 ob_size 和容量都是 4，append 的时候发现容量不够 // 所以会扩容，那么这里的 newsize 就是 5 // 如果是 extend 添加 3 个元素，那么这里的 newsize 就是 7 // 当然 list_resize 这个函数不仅可以扩容，也可以缩容 // 假设列表原来有 1000 个元素，这个时候将列表清空了，那么容量肯定缩小，不然会浪费内存 // 如果清空了列表，那么这里的 newsize 显然就是 0 // 二级指针，指向指针数组的首元素 PyObject **items; // 新的容量，以及新的指针数组的内存大小 size_t new_allocated, num_allocated_bytes; // 获取原来的容量 Py_ssize_t allocated = self->allocated; // 如果 newsize 达到了容量的一半，但还没有超过容量 // 那么意味着 newsize、或者新的 ob_size 和容量是匹配的 // 所以容量不会变化，直接将列表的 ob_size 设置为 newsize 即可 if (allocated >= newsize && newsize >= (allocated >> 1)) { assert(self->ob_item != NULL || newsize == 0); Py_SIZE(self) = newsize; return 0; } // 走到这里说明容量和 newsize 不匹配了，所以要进行扩容或者缩容 // 因此要申请新的底层数组，那么长度是多少呢？ // 这里给出了公式，一会儿我们可以通过 Python 进行测试 new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6); // 容量也是有范围的，乘上 8 字节不能超过 PY_SSIZE_T_MAX if (new_allocated > (size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)) { PyErr_NoMemory(); return -1; } // 如果 newsize 为 0，那么容量也为 0 if (newsize == 0) new_allocated = 0; // 分配内存 num_allocated_bytes = new_allocated * sizeof(PyObject *); items = (PyObject **)PyMem_Realloc(self->ob_item, num_allocated_bytes); if (items == NULL) { PyErr_NoMemory(); return -1; } // 将 ob_items 字段设置为 items self->ob_item = items; // 将 ob_size 字段设置为 newsize Py_SIZE(self) = newsize; // 将 allocated 字段设置为 new_allocated self->allocated = new_allocated; return 0;\n} 我们看到还是很简单的，没有什么黑科技。然后是列表扩容的时候，容量和元素个数之间的规律。其实在 list_resize 函数中是有注释的，其中有这么一行。 说明我们往一个空列表中不断 append 元素的时候，容量会按照上面的规律进行变化，我们来试一下。 lst = []\nallocated = 0\nprint(\"此时容量是: 0\") for item in range(100): lst.append(item) # 添加元素 # 计算 ob_size ob_size = len(lst) # 判断 ob_size 和当前的容量 if ob_size > allocated: # 列表的大小减去空列表的大小，再除以 8 显然就是容量 allocated = (lst.__sizeof__() - [].__sizeof__()) // 8 print(f\"列表扩容啦, 新的容量是: {allocated}\")\n\"\"\"\n此时容量是: 0\n列表扩容啦, 新的容量是: 4\n列表扩容啦, 新的容量是: 8\n列表扩容啦, 新的容量是: 16\n列表扩容啦, 新的容量是: 25\n列表扩容啦, 新的容量是: 35\n列表扩容啦, 新的容量是: 46\n列表扩容啦, 新的容量是: 58\n列表扩容啦, 新的容量是: 72\n列表扩容啦, 新的容量是: 88\n列表扩容啦, 新的容量是: 106\n\"\"\" 我们看到和官方给的结果是一样的，显然这是毫无疑问的，根据底层的公式也能算出来。 ob_size = 0\nallocated = 0 print(allocated, end=\" \")\nfor item in range(100): newsize = ob_size + 1 if newsize > allocated: allocated = (newsize + (newsize >> 3) + 6) & ~3 print(allocated, end=\" \") ob_size = newsize\n\"\"\"\n0 4 8 16 24 32 40 52 64 76 92 108 \"\"\" 注：扩容是在添加元素的时候发现容量不够发生的，也就是底层数组存储的实际元素的个数（列表长度）等于数组长度，没办法再容纳新的元素了，所以要扩容。 如果我们直接通过 lst = [] 这种形式创建列表的话，那么其长度和容量是一样的。 lst = [0] * 1000\n# 长度和容量一致\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 但再添加一个元素的话, 那么 ob_size 会变成 1001，大于容量 1000\n# 所以此时列表就要扩容了, 执行 list_resize，里面的 new_size 就是 1001\n# 然后是怎么分配容量来着，new_allocated = (size_t)newsize + (newsize >> 3) + (newsize < 9 ? 3 : 6)\nprint( \"新容量:\", 1001 + (1001 >> 3) + (3 if 1001 < 9 else 6)\n) # 新容量: 1132 # append 一个元素，列表扩容\nlst.append(123)\n# 计算容量\nprint((lst.__sizeof__() - [].__sizeof__()) // 8) # 1132 结果是一样的，因为底层就是这么实现的，所以结果必须一样。只不过我们通过这种测试的方式证明了这一点，也加深了对列表的认识。 需要注意的是，会影响列表元素个数的操作（append、extend、insert、pop 等等），在执行前都会先执行一下 list_resize 进行容量检测。如果计算之后的 newsize 和 allocated 之间的关系是匹配的，即 allocated//2 <= newsize <= allocated，那么只需要将 ob_size 的大小更新为 newsize 即可。如果不匹配，那么还要进行扩容，此时是一个 O(n) 的操作。 介绍完扩容，再来介绍缩容，因为列表元素个数要是减少到和容量不匹配的话，也要进行缩容。 举个生活中的例子，假设你租了 10 间屋子用于办公，显然你要付 10 间屋子的房租，不管你有没有用，一旦租了肯定是要付钱的。同理底层数组也是一样，只要你申请了，不管有没有元素，内存已经占用了。但有一天你用不到 10 间屋子了，假设要用 8 间或者 9 间，那么会让剩余的屋子闲下来。但由于退租比较麻烦，并且只闲下来一两间屋子，所以干脆就不退了，还是会付 10 间屋子的钱，这样没准哪天又要用的时候就不用重新租了。 对于列表也是如此，在删除元素（相当于屋子不用了）的时候，如果发现长度还没有低于容量的一半，那么也不会缩容。但反之就要缩容了，比如屋子闲了 8 间，也就是只需要两间屋子就足够了，那么此时肯定要退租了，闲了 8 间，可能会退掉 6 间。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 # 删除 500 个元素, 此时长度或者说 ob_size 就为 500\nlst[500:] = []\n# 但 ob_size 还是达到了容量的一半, 所以不会缩容\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 500 1000 # 如果再删除一个元素的话, 那么不好意思, 显然就要进行缩容了\n# 因为 ob_size 变成了 499, 小于 1000 // 2\n# 缩容之后容量怎么算呢? 还是之前那个公式\nprint(499 + (499 >> 3) + (3 if 499 < 9 else 6)) # 567 # 测试一下, 删除一个元素, 看看会不会按照我们期待的规则进行缩容\nlst.pop()\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 499 567 一切都和我们想的是一样的，另外在代码中我们还看到一个 if 语句，就是如果 newsize 是 0，那么容量也是 0，来测试一下。 lst = [0] * 1000\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 1000 1000 lst[:] = []\nprint( len(lst), (lst.__sizeof__() - [].__sizeof__()) // 8\n) # 0 0 # 如果按照之前的容量变化公式的话, 会发现结果应该是 3\n# 但实际结果是 0, 就是因为多了 if 判断\n# 如果 newsize 是 0, 就把容量也设置为 0\nprint(0 + (0 >> 3) + (3 if 0 < 9 else 6)) # 3 为什么要这么做呢？因为 Python 认为，列表长度为 0 的话，说明你不想用这个列表了，所以多余的 3 个也没有必要申请了。 还以租房为栗，如果你一间屋子都不用了，说明你可能不用这里的屋子办公了，因此直接全部退掉。 以上就是列表在改变容量时所采用的策略，我们从头到尾全部分析了一遍。下一篇文章来看一下列表的创建，以及缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"34. 列表是怎么扩容的？","id":"141","title":"34. 列表是怎么扩容的？"},"142":{"body":"前面我们分析了列表的底层结构和扩容机制，本篇文章来聊一聊列表的创建和销毁，以及缓存池。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 楔子","id":"142","title":"楔子"},"143":{"body":"创建列表，解释器只提供了唯一的一个 Python/C API，也就是 PyList_New。这个函数接收一个 size 参数，允许我们在创建 PyListObject 对象时指定底层的 PyObject * 数组的长度。 //Objects/listobject.c\nPyObject *\nPyList_New(Py_ssize_t size)\n{ // 声明一个 PyListObject * 变量 // 指向即将创建的 PyListObject 对象 PyListObject *op; // 底层数组的长度必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // numfree 表示缓存池中已缓存的元素个数 // 如果大于 0，证明有可用元素，那么会从缓存池中获取 if (numfree) { // 可用元素的数量减一 numfree--; // 获取缓存的列表指针，并将指向的列表的引用计数设置为 1 op = free_list[numfree]; _Py_NewReference((PyObject *)op); } else { // 如果缓存池中没有可用元素，那么通过 PyObject_GC_New 申请内存 // 问题来了，之前申请内存不是用的 PyObject_New 吗 // 这里为啥换成 PyObject_GC_New 呢？我们稍后再说 op = PyObject_GC_New(PyListObject, &PyList_Type); if (op == NULL) return NULL; } // 如果 size <= 0，那么一定等于 0，此时列表不包含任何元素 if (size <= 0) // 那么 ob_item 直接设置为 NULL op->ob_item = NULL; else { // 否则为底层数组申请内存，因为存储的都是指针 // 所以大小为 size * sizeof(PyObject *) op->ob_item = (PyObject **) PyMem_Calloc(size, sizeof(PyObject *)); if (op->ob_item == NULL) { Py_DECREF(op); return PyErr_NoMemory(); } } // 将 ob_size 和 allocated 均设置为 size Py_SIZE(op) = size; op->allocated = size; // 让列表被 GC 跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 整个过程非常好理解，就是先创建一个 PyListObject 对象，然后再为底层数组申请内存，最后通过 ob_item 字段将两者关联起来。当然这个过程中会使用缓存池，关于缓存池一会儿再聊。 然后还要说一下内存申请函数，在这之前我们看到申请内存用的是 PyObject_New 函数，它和这里的 PyObject_GC_New 有什么区别呢？由于涉及到 Python 的内存管理，我们暂时先不聊那么深，大家先有个基本了解即可，等到介绍内存管理和垃圾回收的时候会详细剖析。 我们知道 Python 对象在底层都是一个结构体，并且结构体内部嵌套了 PyObject。但对于那些能够产生循环引用的可变对象来说，它们除了 PyObject 之外，还包含了一个 PyGC_Head，用于垃圾回收。 所以 PyObject_New 和 PyObject_GC_New 接收的参数是一样的，但后者会多申请 16 字节的内存，这 16 字节是为 PyGC_Head 准备的。那么问题来了，PyGC_Head 在什么地方呢？ PyGC_Head 就在 PyObject 的前面，但是注意：虽然为 PyGC_Head 申请了内存，但返回的是 PyObject 的地址。至于这里面的更多细节，后续在剖析内存管理和垃圾回收的时候细说，目前先简单了解一下即可。 然后再说一下计算内存的两种方式： import sys lst = []\n# 可以调用 __sizeof__ 方法计算对象的内存\nprint(lst.__sizeof__()) # 40\n# 也可以通过 sys.getsizeof 函数\nprint(sys.getsizeof(lst)) # 56 我们看到 sys.getsizeof 算出的结果会多出 16 字节，相信你能猜到原因，因为它将 PyGC_Head 也算进去了，而对象的 __sizeof__ 方法则不会算在内。 不过对于字符串、整数、浮点数这种不会产生循环引用的对象来说，由于没有 PyGC_Head，所以两种方式计算的结果是一样的。 import sys print(\"\".__sizeof__()) # 49\nprint(sys.getsizeof(\"\")) # 49 print((123).__sizeof__()) # 28\nprint(sys.getsizeof(123)) # 28 以上就是列表的创建，整个过程不难理解。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的创建","id":"143","title":"列表的创建"},"144":{"body":"创建 PyListObject 对象时，会先检测缓存池 free_list 里面是否有可用的对象，有的话直接拿来用，否则通过 malloc 在系统堆上申请。列表的缓存池是使用数组实现的，里面最多维护 80 个 PyListObject 对象。 // Objects/listobject.c\n#ifndef PyList_MAXFREELIST\n#define PyList_MAXFREELIST 80\n#endif\n// free_list 是一个 PyListObject * 数组，容量为 80\n// 添加元素时会从数组的尾部添加，获取元素时也会从数组的尾部获取\nstatic PyListObject *free_list[PyList_MAXFREELIST];\n// 缓存池中可用元素数量\nstatic int numfree = 0; 根据之前的经验我们知道，既然创建的时候能从缓存池中获取，那么在执行析构函数的时候也要把列表放到缓存池里面。看一下列表的析构函数，它由 PyList_Type 的 tp_dealloc 字段负责，而该字段被设置为 list_dealloc。 // Objects/listobject.c\nstatic void\nlist_dealloc(PyListObject *op)\n{ Py_ssize_t i; // 列表可能会产生循环引用，因此创建之后要被 GC 跟踪 // 而现在要被回收了，所以也要取消 GC 跟踪 PyObject_GC_UnTrack(op); // 这一步的作用，稍后再说 Py_TRASHCAN_BEGIN(op, list_dealloc) // 先释放底层数组 if (op->ob_item != NULL) { // 但是释放之前，还有一件重要的事情 // 要将底层数组中每个指针指向的对象的引用计数都减去 1 // 因为它们不再持有对\"对象\"的引用 i = Py_SIZE(op); while (--i >= 0) { Py_XDECREF(op->ob_item[i]); } // 然后释放底层数组所占的内存 PyMem_FREE(op->ob_item); } // 如果已缓存的元素个数小于 80 个，并且 op 指向的是列表 // 那么将 op 追加到数组中，并将 numfree 自增 1 if (numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) free_list[numfree++] = op; else // 否则将列表的内存释放掉 Py_TYPE(op)->tp_free((PyObject *)op); Py_TRASHCAN_END\n} 我们知道创建一个 PyListObject 对象会分为两步，先创建 PyListObject 对象，然后创建底层数组，最后让 PyListObject 对象的 ob_item 字段指向底层数组的首元素。同理，在销毁一个 PyListObject 对象时，会先释放 ob_item 维护的底层数组，然后在缓存池已满的情况下再释放 PyListObject 对象自身。 现在我们算是明白了缓存池的机制，本来在销毁列表时，要将它的内存释放。但因为缓存池机制，解释器并没有这么做，而是将它的指针放在了缓存池里，至于列表对象则依旧驻留在堆上，只是我们已经无法再访问了。 当以后创建新的 PyListObject 对象时，解释器会首先唤醒这些已经死去的 PyListObject 对象，给它们一个洗心革面、重新做人的机会。但需要注意的是，这里缓存的仅仅是 PyListObject 对象，至于底层数组，其 ob_item 已经不再指向了。 从 list_dealloc 中我们可以看到，PyListObject 对象的指针在放进缓存池之前，ob_item 指向的数组就已经被释放掉了，同时数组中指针指向的对象的引用计数会减 1。所以最终数组中这些指针指向的对象也大难临头各自飞了，或生存、或毁灭，总之此时和 PyListObject 之间已经没有任何联系了。 但是为什么要这么做呢？为什么不连底层数组也一起维护呢？可以想一下，如果继续维护的话，数组中指针指向的对象永远不会被释放，那么很可能会产生悬空指针的问题。 但实际上是可以将底层数组进行保留的，做法是只将数组中指针指向的对象的引用计数减 1，然后将数组中的指针都设置为 NULL，不再指向之前的对象，但并不释放底层数组本身所占用的内存空间。这样一来释放的内存不会交给系统堆，那么再次分配的时候，速度会快很多。但这样会带来两个问题。 1）这些内存没人用也会一直占着，并且只能供 PyListObject 对象的 ob_item 指向的底层数组使用。 2）基于缓存池获取的列表的容量，和新创建的列表的容量不一定匹配。比如底层数组长度为 6 的 PyListObject * 被放入了缓存池，那么表示列表最多容纳 6 个元素，但如果我们要创建一个长度为 8 的列表怎么办？此时依旧要重新为底层数组申请内存。 因此基于以上两个原因，Python 选择将底层数组所占的内存交还给了系统堆，当然也节省了内存。 lst1 = [1, 2, 3]\nprint(id(lst1)) # 139672412671360\n# 扔到缓存池中，放在数组的尾部\ndel lst1 # 从缓存池中获取，也会从数组的尾部开始拿\nlst2 = [1, 2, 3]\nprint(id(lst2)) # 139672412671360 # 因此打印的地址是一样的 以上就是列表的创建和销毁，以及它的缓存池原理。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » 列表的销毁","id":"144","title":"列表的销毁"},"145":{"body":"在看列表的销毁过程时，我们注意到里面有这么一行代码。 Py_TRASHCAN_BEGIN(op, list_dealloc) 这是做什么的呢，首先在 Python 中，我们可以创建具有深度递归的对象，比如： L = None for i in range(2 ** 20): L = [L] del L 此时的 L 就是一个嵌套了 2 ** 20 层的列表，当我们删除 L 的时候，会先销毁 L[0]、然后销毁 L[0][0]，以此类推，直到递归深度为 2 ** 20。而这样的深度毫无疑问会溢出 C 的调用栈，导致解释器崩溃。但事实上我们在 del L 的时候解释器并没有崩溃，原因就是 CPython 发明了一种名为 trashcan 的机制，它通过延迟销毁的方式来限制销毁的递归深度。关于这一特性，我们知道就好了，不用太关注。 下一篇文章来聊一聊列表的操作在底层是怎么实现的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"35. 解密列表的创建与销毁，以及缓存池长什么样子？ » trashcan 机制","id":"145","title":"trashcan 机制"},"146":{"body":"列表拥有非常多的方法，比如添加元素、查询元素等，这些都属于列表的自定义方法。当然不光是列表，任何对象都可以有自己的自定义方法，而这些方法会保存在类型对象的 tp_methods 里面。 当然列表除了拥有自定义的方法之外，还拥有作为序列型对象所共有的方法，比如合并、基于索引和切片获取元素、基于索引和切片设置元素等等。这些方法会基于种类被抽象成三个方法簇，分别是： tp_as_number：数值型对象拥有的方法； tp_as_sequence：序列型对象拥有的方法； tp_as_mapping：映射型对象拥有的方法； 每个方法簇都包含了大量的 C 函数，每个 C 函数一般会对应 Python 里的一个魔法方法和操作符。比如 tp_as_sequence 的 sq_concat 对应序列型对象的 __add__ 方法，tp_as_number 的 nb_subtract 对应数值型对象的 __sub__ 方法。 那么接下来我们就详细剖析一下这些方法的具体实现过程。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 楔子","id":"146","title":"楔子"},"147":{"body":"序列型对象都实现了加法运算，比如列表，两个列表相加可以合并为一个新的列表。 print([1, 2, 3] + [4, 5]) \"\"\"\n[1, 2, 3, 4, 5]\n\"\"\" 虽然使用了 + 操作符，但它在底层是由 tp_as_sequence 的 sq_concat 负责实现的，该字段被赋值为 list_concat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_concat(PyListObject *a, PyObject *bb)\n{ // 两个列表相加之后的新列表的长度 Py_ssize_t size; Py_ssize_t i; PyObject **src, **dest; PyListObject *np; // 如果 bb 不是列表，抛出 TypeError if (!PyList_Check(bb)) { PyErr_Format(PyExc_TypeError, \"can only concatenate list (not \\\"%.200s\\\") to list\", bb->ob_type->tp_name); return NULL; }\n#define b ((PyListObject *)bb) // 两个列表的长度相加一定小于 PY_SSIZE_T_MAX if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) return PyErr_NoMemory(); // 新列表的长度，等于相加的两个列表的长度之和 size = Py_SIZE(a) + Py_SIZE(b); // 为 PyListObject 和底层数组申请空间（空间大小为 8 * size） np = (PyListObject *) list_new_prealloc(size); if (np == NULL) { return NULL; } // 将第一个列表的元素增加引用计数之后，拷贝到新列表中 src = a->ob_item; dest = np->ob_item; for (i = 0; i < Py_SIZE(a); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将第二个列表的元素增加引用计数之后，拷贝到新列表中 src = b->ob_item; dest = np->ob_item + Py_SIZE(a); for (i = 0; i < Py_SIZE(b); i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; // 转成泛型指针之后返回 return (PyObject *)np;\n#undef b\n} 逻辑非常简单，假设两个列表 a 和 b 相加，过程如下。 先申请一个新列表，长度为 len(a) + len(b)； 将列表 a 的元素拷贝到新列表中； 将列表 b 的元素拷贝到新列表中； 说白了就是两个 for 循环。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的相加","id":"147","title":"列表的相加"},"148":{"body":"列表可以乘上一个整数，将自身重复指定次数，该过程会返回一个新列表。 print([1, 2, 3] * 3)\n\"\"\"\n[1, 2, 3, 1, 2, 3, 1, 2, 3]\n\"\"\" 虽然使用了 * 操作符，但它在底层是由 tp_as_sequence 的 sq_repeat 负责实现的，该字段被赋值为 list_repeat 函数，看一下它的内部逻辑。 // Objects/listobject.c\nstatic PyObject *\nlist_repeat(PyListObject *a, Py_ssize_t n)\n{ Py_ssize_t i, j; Py_ssize_t size; PyListObject *np; PyObject **p, **items; PyObject *elem; // 如果 n 小于 0，那么将 n 设置为 0 if (n < 0) n = 0; // 长度有限制，不能超过 PY_SSIZE_T_MAX if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n) return PyErr_NoMemory(); // 新列表的长度 size = Py_SIZE(a) * n; // 如果列表长度为 0，那么直接返回空列表即可 if (size == 0) return PyList_New(0); // 为新列表和底层数组申请空间，底层数组的长度为 size np = (PyListObject *) list_new_prealloc(size); if (np == NULL) return NULL; // 如果原始列表的长度为 1，比如 a = [1]，n = 3 // 那么新列表就是 [1, 1, 1] if (Py_SIZE(a) == 1) { // 指向新列表的底层数组的首元素 items = np->ob_item; // 拿到原始列表的第一个元素 elem = a->ob_item[0]; // 将新列表的底层数组的元素全部设置为 elem for (i = 0; i < n; i++) { items[i] = elem; Py_INCREF(elem); } } // 如果原始列表的长度不为 1 else { // 指向新列表的底层数组的首元素 p = np->ob_item; // 指向原始列表的底层数组的首元素 items = a->ob_item; // 两层 for 循环 // 内层循环遍历原始数组，将元素拷贝到新数组，外层循环则是循环 n 次 for (i = 0; i < n; i++) { for (j = 0; j < Py_SIZE(a); j++) { *p = items[j]; Py_INCREF(*p); p++; } } } // 将新列表的 ob_size 设置为 size Py_SIZE(np) = size; return (PyObject *) np;\n} 整个过程非常朴实无华。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 列表的重复","id":"148","title":"列表的重复"},"149":{"body":"列表可以基于索引和切片截取元素。 data = [1, 2, 3, 4, 5]\nprint(data[1]) # 2\nprint(data[1: 4]) # [2, 3, 4] 在底层它由 tp_as_mapping 的 mp_subscript 实现，该字段被赋值为 list_subscript 函数，看一下它的内部逻辑。 // Objects/listobject.c static PyObject *\nlist_subscript(PyListObject* self, PyObject* item)\n{ // 在基于索引和切片截取时，所有序列型对象的逻辑都差不多 if (PyIndex_Check(item)) { Py_ssize_t i; // 如果 item 是索引，那么转成 Py_ssize_t 整数 i = PyNumber_AsSsize_t(item, PyExc_IndexError); if (i == -1 && PyErr_Occurred()) return NULL; // 如果 i 小于 0，那么加上列表长度，转成正数索引 if (i < 0) i += PyList_GET_SIZE(self); // 调用 list_item 获取 ob_item 中索引为 i 的元素 return list_item(self, i); } // 如果 item 是切片 else if (PySlice_Check(item)) { // start, stop, step 分别表示起始位置、终止位置、步长 // slicelength 表示切片截取的长度，也就是要截取多少个元素 Py_ssize_t start, stop, step, slicelength, cur, i; PyObject* result; PyObject* it; PyObject **src, **dest; // 获取切片的 start、stop、step if (PySlice_Unpack(item, &start, &stop, &step) < 0) { return NULL; } // 传入原始列表的长度，对 start 和 stop 进行调整，并返回 slicelength slicelength = PySlice_AdjustIndices(Py_SIZE(self), &start, &stop, step); // 如果 slicelength <= 0，说明截取不到任何元素 // 比如 data[5: 1] 或者 data[1: 5: -1]，那么直接返回空列表 if (slicelength <= 0) { return PyList_New(0); } // 如果步长为 1，那么直接将列表中 start 到 stop 之间的元素拷过去即可 else if (step == 1) { return list_slice(self, start, stop); } // 否则说明步长不为 1 else { // 为创建的新列表和底层数组申请空间 result = list_new_prealloc(slicelength); if (!result) return NULL; src = self->ob_item; // 从 start 处开始遍历，将元素拷贝过去 // 然后 cur 每次增加 step，遍历次数为 slicelength dest = ((PyListObject *)result)->ob_item; for (cur = start, i = 0; i < slicelength; cur += (size_t)step, i++) { it = src[cur]; Py_INCREF(it); dest[i] = it; } // 将新列表的 ob_size 设置为 slicelength Py_SIZE(result) = slicelength; return result; } } // 否则说明 item 既不是索引也不是切片，那么报错 else { PyErr_Format(PyExc_TypeError, \"list indices must be integers or slices, not %.200s\", item->ob_type->tp_name); return NULL; }\n} 这个和之前介绍的 bytes 对象有点像，因为它们都是序列型对象，在基于索引和切片截取元素时的逻辑也是类似的。但 bytes 对象只能截取元素，却不能设置元素，而列表是可以的，因为列表是可变对象。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片获取元素","id":"149","title":"基于索引和切片获取元素"},"15":{"body":"PyObject 是所有对象的核心，它包含了所有对象都共有的信息，但是还有那么一个属性虽然不是每个对象都有，但至少有一大半的对象会有，能猜到是什么吗？ 之前说过，对象根据所占的内存是否固定，可以分为定长对象和变长对象，而变长对象显然有一个长度的概念，比如字符串、列表、元组等等。即便是相同类型的实例对象，但是长度不同，所占的内存也是不同的。比如字符串内部有多少个字符，元组、列表内部有多少个元素，显然这里的多少也是 Python 中很多对象的共有特征。虽然不像引用计数和类型那样是每个对象都必有的，但也是绝大部分对象所具有的。 所以针对变长对象，Python 底层也提供了一个结构体，因为 Python 里面很多都是变长对象。 // Include/object.h typedef struct { PyObject ob_base; Py_ssize_t ob_size;\n} PyVarObject; 我们看到 PyVarObject 实际上是 PyObject 的一个扩展，它在 PyObject 的基础上添加了一个 ob_size 字段，用于记录内部的元素个数。比如列表，列表的 ob_size 维护的就是列表的元素个数，插入一个元素，ob_size 会加 1，删除一个元素，ob_size 会减 1。 因此使用 len 函数获取列表的元素个数是一个时间复杂度为 O(1) 的操作，因为 ob_size 始终和内部的元素个数保持一致，所以会直接返回 ob_size。 所有的变长对象都拥有 PyVarObject，而所有的对象都拥有 PyObject，这就使得在 Python 中，对对象的引用变得非常统一。我们只需要一个 PyObject * 就可以引用任意一个对象，而不需要管这个对象实际是一个什么样的对象。 所以 Python 变量、以及容器内部的元素，本质上都是一个 PyObject *。而在操作变量的时候，也要先根据 ob_type 字段判断指向的对象的类型，然后再寻找该对象具有的方法，这也是 Python 效率慢的原因之一。 由于 PyObject 和 PyVarObject 要经常使用，所以底层提供了两个宏，方便定义。 // Include/object.h #define PyObject_HEAD PyObject ob_base;\n#define PyObject_VAR_HEAD PyVarObject ob_base; 比如定长对象浮点数，在底层对应的结构体为 PyFloatObject，它只需在 PyObject 的基础上再加一个 double 即可。 typedef struct { // 等价于 PyObject ob_base; PyObject_HEAD double ob_fval;\n} PyFloatObject; 再比如变长对象列表，在底层对应的结构体是 PyListObject，所以它需要在 PyVarObject 的基础上再加一个指向指针数组首元素的二级指针和一个容量。 typedef struct { // 等价于 PyVarObject ob_base; PyObject_VAR_HEAD PyObject **ob_item; Py_ssize_t allocated;\n} PyListObject; 这上面的每一个字段都代表什么，我们之前提到过，当然这些内置的数据结构后续还会单独剖析。 对于 PyListObject，里面的 ob_item 就是指向指针数组首元素的二级指针，而 allocated 表示已经分配的容量，一旦添加元素的时候发现 ob_size 自增 1 之后会大于 allocated，那么解释器就知道数组已经满了（容量不够了）。于是会申请一个长度更大的指针数组，然后将旧数组内部的元素按照顺序逐个拷贝到新数组里面，并让 ob_item 指向新数组的首元素，这个过程就是列表的扩容，后续在剖析列表的时候还会细说。 所以我们看到列表在添加元素的时候，地址是不会改变的，即使容量不够了也没关系，直接让 ob_item 指向新的数组就好了，至于 PyListObject 对象（列表）本身的地址是不会变化的。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 可变对象的地基：PyVarObject","id":"15","title":"可变对象的地基：PyVarObject"},"150":{"body":"列表是可变对象，因为它支持设置元素，即对内部元素进行修改。基于索引设置元素就不说了，我们主要看切片，它背后还是有一些复杂的。 data = [1, 2, 3, 4, 5, 6, 7, 8] # 通过切片设置元素，右值一定是一个可迭代对象\ndata[0: 3] = [11, 22, 33]\n# 会将 data[0] 设置为 11，将 data[1] 设置为 22，将 data[2] 设置为 33\nprint(data)\n\"\"\"\n[11, 22, 33, 4, 5, 6, 7, 8]\n\"\"\" # 而且它们的长度是可以不相等的，这里表示将 [0: 3] 的元素设置为 [1, 2]\n# 即 data[0] 设置成 1，data[1] 设置成 2，那么问题来了，data[2] 咋办？\n# 由于右值中已经没有元素与之匹配了，那么 data[2] 就会被删掉\ndata[0: 3] = [1, 2]\nprint(data)\n\"\"\"\n[1, 2, 4, 5, 6, 7, 8]\n\"\"\" # 所以如果想删除 [0: 3] 的元素，那么只需要执行 data[0: 3] = [] 即可\n# 因为 [] 里面没有元素能与之匹配，所以 data 中 [0: 3] 的位置由于匹配不到\n# 那么相当于执行了删除操作，当然由于 Python 的动态特性，还可以像下面这么做\n# data[0: 3] = []、data[0: 3] = ()、data[0: 3] = \"\" 等等也是没问题的\ndata[0: 3] = \"\"\nprint(data)\n\"\"\"\n[5, 6, 7, 8]\n\"\"\"\n# 实际上执行 del data[0] 的时候，就是执行了 data[0: 1] = []\n# 当然，如果右值元素多的话也是可以的，相当于插入\n# 比如这里的 data[0] 匹配 1，然后左边就结束了\n# 于是右侧剩余的元素会依次插在后面\ndata[0: 1] = [1, 2, 3, 4]\nprint(data)\n\"\"\"\n[1, 2, 3, 4, 6, 7, 8]\n\"\"\"\n# 重点来了，如果切片的步长不等于 1 的话，那么两边一定要匹配\n# 由于 data[:: 2] 会得到 4 个元素，那么右边的可迭代对象的长度就必须也是 4\ndata[:: 2] = ['a', 'b', 'c', 'd']\nprint(data)\n\"\"\"\n['a', 2, 'b', 4, 'c', 7, 'd']\n\"\"\" # 但如果长度不一致，那么会报错\ntry: data[:: 2] = ['a', 'b', 'c']\nexcept Exception as e: # 显然会报错 print(e) \"\"\"\nattempt to assign sequence of size 3 to extended slice of size 4\n\"\"\" 至于它的源码有兴趣可以自己看一下，在底层它由 tp_as_mapping 的 mp_ass_subscript 负责实现，该字段被赋值为 list_ass_subscript 函数。逻辑比较长，但不难理解，我们总结一下。 list_subscript 用于获取元素，list_ass_subscript 用于设置元素。调用这两个函数，我们即可以传入索引，也可以传入切片。 获取元素时传入的是索引，那么 list_subscript 内部会调用 list_item，传入的是切片，那么会调用 list_slice。 设置元素时传入的是索引，那么 list_ass_subscript 内部会调用 list_ass_item，传入的是切片，那么会调用 list_ass_slice。并且 list_ass_slice 虽然是设置元素，但删除元素也是调用的它，比如通过 data[n: n+1]=[] 便可删除索引为 n 的元素。事实上 remove 和 pop 方法都只是计算出待删除元素的索引，真正的删除操作还是通过 list_ass_slice 来执行的。 另外，当传入切片时，只有步长为 1，才会调用 list_slice 和 list_ass_slice。如果步长不为 1，那么就采用循环的方式逐个遍历。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 基于索引和切片设置元素","id":"150","title":"基于索引和切片设置元素"},"151":{"body":"以上我们就介绍了列表作为序列型对象拥有的方法，但除了这些它还有很多自定义的方法。由于列表用得非常广泛，关于它的方法我们都来详细地说上一说，下一篇文章介绍列表的自定义方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"36. 列表作为序列型对象都支持哪些操作，它们在底层是怎么实现的？ » 小结","id":"151","title":"小结"},"152":{"body":"上一篇文章我们介绍了列表作为序列型对象支持的方法，但列表还有很多的自定义方法。作为一名优秀的 Python 工程师，我们必须要知道这些方法的实现过程，以及相应的时间复杂度。 实例对象能够调用的方法都定义在类型对象中，类型对象无一例外都是 PyTypeObject 结构体实例，该结构体有一个 tp_methods 字段，负责维护实例对象能够调用的方法。由于 tp_methods 指向 PyMethodDef 结构体类型的数组，所以一个 PyMethodDef 结构体实例，就是 Python 实例对象能够调用的一个方法。 // Include/methodobject.h\nstruct PyMethodDef { // 暴露给 Python 的方法名 const char *ml_name; // 承载了具体逻辑的 C 函数 PyCFunction ml_meth; // 指示函数的调用方式和传递参数的方式，比如 /* METH_NOARGS: 表示函数不接收任何参数 * METH_O: 函数只接收一个参数 * METH_VARARGS: 函数支持以元组的形式接收多个位置参数 * METH_KEYWORDS: 函数支持关键字参数 * METH_CLASS: 函数是一个类方法，等价于 Python 里的 @classmethod * METH_STATIC: 函数是一个静态方法，即 @staticmethod * METH_FASTCALL: 函数使用优化的快速调用协议，Python 3.7 及以上版本可用 传递参数时使用 C 数组，而不是 Python 元组 * METH_COEXIST: 如果希望存在两个同名函数，但类和实例分别调用不同的函数 那么便可以指定 METH_COEXIST */ int ml_flags; // 函数的 docstring const char *ml_doc; }; 而 list 在底层对应 PyList_Type，它的 tp_methods 字段被赋值为 list_methods。 里面定义了列表可以调用的方法，相信当你以后想查看某个对象的方法的底层实现时，已经知道该怎么定位了，下面我们就来看看这些方法的实现过程。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 楔子","id":"152","title":"楔子"},"153":{"body":"append 方法可以往列表尾部追加元素。 // Objects/clinic/listobject.c.h\n#define LIST_APPEND_METHODDEF \\ {\"append\", (PyCFunction)list_append, METH_O, list_append__doc__}, 它由 list_append 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_append(PyListObject *self, PyObject *object)\n{ // 调用 app1 添加元素，并返回 None if (app1(self, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\napp1(PyListObject *self, PyObject *v)\n{ // 获取当前列表的长度 Py_ssize_t n = PyList_GET_SIZE(self); assert (v != NULL); if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 追加元素之后 ob_size 会变成 n + 1 // 调用 list_resize 函数，判断 n + 1 和容量之间的关系 // 只要涉及到列表元素个数的改变，都要调用 list_resize 函数 if (list_resize(self, n+1) < 0) return -1; // 增加引用计数 Py_INCREF(v); // 将元素设置在索引为 n 的位置 PyList_SET_ITEM(self, n, v); return 0;\n} 所谓往尾部追加元素，本质上就是将元素设置在索引为 len 的位置。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » append：在尾部追加元素","id":"153","title":"append：在尾部追加元素"},"154":{"body":"接下来是列表的 insert 方法。 // Objects/clinic/listobject.c.h\n#define LIST_INSERT_METHODDEF \\ {\"insert\", (PyCFunction)(void(*)(void))list_insert, METH_FASTCALL, list_insert__doc__}, 它由 list_insert 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_insert(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 函数的返回值，但只会返回 None PyObject *return_value = NULL; // 插入的位置 Py_ssize_t index; // 插入的元素 PyObject *object; // insert 方法精确接收两个参数 if (!_PyArg_CheckPositional(\"insert\", nargs, 2, 2)) { goto exit; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 参数 args 是一个元组，里面包含了插入位置和元素 Py_ssize_t ival = -1; // 插入位置，对象必须实现 __index__ PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { // 转成 Py_ssize_t ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } // 赋值给 index index = ival; } // 拿到待插入的元素 object = args[1]; // 调用 list_insert_impl 执行元素插入逻辑 return_value = list_insert_impl(self, index, object); exit: // 虽然这里返回了 return_value，但我们知道 insert 方法是没有返回值的 // 或者说返回值为 None，所以上面的 list_insert_impl 一定返回了 None return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_insert_impl(PyListObject *self, Py_ssize_t index, PyObject *object)\n{ // 调用 ins1 插入元素，插入成功之后返回 None if (ins1(self, index, object) == 0) Py_RETURN_NONE; return NULL;\n} static int\nins1(PyListObject *self, Py_ssize_t where, PyObject *v)\n{ // 初始化循环变量 i，n 为列表长度 Py_ssize_t i, n = Py_SIZE(self); // 指向 ob_item 数组的首元素 PyObject **items; if (v == NULL) { PyErr_BadInternalCall(); return -1; } if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, \"cannot add more objects to list\"); return -1; } // 只要涉及到元素个数的改变，比如添加和删除元素 // 都会先调用 list_resize，在里面检测一下容量 // 比如这里，如果发现 (容量 >= n + 1) && (容量 / 2 <= n + 1) // 那么说明容量目前是合理的，不需要做任何的扩容或缩容操作（如果条件不满足则需要） // 然后将列表的 ob_size 修改为 n + 1，直接返回 if (list_resize(self, n+1) < 0) return -1; // 判断插入位置，如果 where 小于 0，那么加上列表长度 if (where < 0) { where += n; // 加上列表长度之后如果还小于 0，那么让其等于 0 if (where < 0) where = 0; } // 如果插入位置大于列表长度 n，那么让其等于 n，此时相当于 append if (where > n) where = n; items = self->ob_item; // 将 where 以及之后的元素依次向右移动一个位置 for (i = n; --i >= where; ) items[i+1] = items[i]; // 将待插入元素 v 的引用计数加 1，并设置在底层数组中索引为 where 的位置 Py_INCREF(v); items[where] = v; return 0;\n} 以上就是 insert 函数的底层逻辑，列表在插入数据的时候是非常灵活的，不管你在什么位置插入，都是合法的。它会自己调整，在确定待插入位置 where 之后，会将 where 以及之后的所有元素都向后挪动一个位置，空出来的地方设置为待插入的值。 另外我们看到 append 和 insert 其实非常像，都是基于索引设置元素。只不过对于 append 来说，索引就是列表长度，而对于 insert 来说，索引是由外界指定的，但函数内部会进行边界调整。 并且由于 insert 会涉及元素的移动，所以它的时间复杂度是 O(n)，而 append 则不会，它的时间复杂度是 O(1)。当然在极端情况下（发生扩容），append 也会退化成 O(n)，只不过这个过程不会频繁发生，所以 append 的复杂度仍然是 O(1) 的。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » insert：在任意位置插入元素","id":"154","title":"insert：在任意位置插入元素"},"155":{"body":"pop 默认会从尾部弹出一个元素，当然我们也可以指定索引，弹出指定索引对应的元素。如果不指定索引，那么默认是 -1。 // Objects/clinic/listobject.c.h\n#define LIST_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))list_pop, METH_FASTCALL, list_pop__doc__}, 它由 list_pop 函数负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_pop(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 返回值 PyObject *return_value = NULL; Py_ssize_t index = -1; // pop 接收 0 ~ 1 个参数 if (!_PyArg_CheckPositional(\"pop\", nargs, 0, 1)) { goto exit; } // 如果参数个数小于 1，说白了就是没有传参，直接跳转到 skip_optional 标签 if (nargs < 1) { goto skip_optional; } if (PyFloat_Check(args[0])) { PyErr_SetString(PyExc_TypeError, \"integer argument expected, got float\" ); goto exit; } { // 如果传参了，那么拿到指定的索引 Py_ssize_t ival = -1; PyObject *iobj = PyNumber_Index(args[0]); if (iobj != NULL) { ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) { goto exit; } index = ival; }\nskip_optional: // 将列表和 index 作为参数传进去，如果不指定索引，那么 index 默认为 -1 return_value = list_pop_impl(self, index); exit: // 返回弹出的元素 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_pop_impl(PyListObject *self, Py_ssize_t index)\n{ PyObject *v; int status; // 如果列表为空，那么抛出 IndexError: pop from empty list if (Py_SIZE(self) == 0) { PyErr_SetString(PyExc_IndexError, \"pop from empty list\"); return NULL; } // 如果 index 小于 0，那么加上列表长度 if (index < 0) index += Py_SIZE(self); // 检测索引是否合法，如果索引小于 0 或大于等于列表长度 // 那么抛出 IndexError: pop index out of range if (!valid_index(index, Py_SIZE(self))) { PyErr_SetString(PyExc_IndexError, \"pop index out of range\"); return NULL; } // 拿到索引为 index 的元素，这也是一会儿要返回的元素 v = self->ob_item[index]; // 快分支，如果 index == Py_SIZE(self) - 1，证明弹出的是列表的最后一个元素 // 那么说明不涉及元素的移动，直接更新 ob_size 即可 if (index == Py_SIZE(self) - 1) { status = list_resize(self, Py_SIZE(self) - 1); if (status >= 0) return v; else return NULL; } Py_INCREF(v); // 删除的不是最后一个元素，那么需要调用 list_ass_slice 进行删除 // 等价于 self[index: index + 1] = []，即删除索引为 index 的元素 status = list_ass_slice(self, index, index+1, (PyObject *)NULL); if (status < 0) { Py_DECREF(v); return NULL; } return v;\n} 以上就是 pop 方法。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » pop：从尾部弹出一个元素","id":"155","title":"pop：从尾部弹出一个元素"},"156":{"body":"index 方法可以接收一个元素，然后返回该元素首次出现的位置。当然还可以额外指定一个 start 和 end，表示查询的范围。 // Objects/clinic/listobject.c.h\n#define LIST_INDEX_METHODDEF \\ {\"index\", (PyCFunction)(void(*)(void))list_index, METH_FASTCALL, list_index__doc__}, 它由 list_index 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_index(PyListObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; PyObject *value; Py_ssize_t start = 0; Py_ssize_t stop = PY_SSIZE_T_MAX; // index 方法接收 1 ~ 3 个参数 if (!_PyArg_CheckPositional(\"index\", nargs, 1, 3)) { goto exit; } // args[0] 表示查找的元素 value = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示查找的起始位置 if (!_PyEval_SliceIndexNotNone(args[1], &start)) { goto exit; } if (nargs < 3) { goto skip_optional; } // args[2] 表示查找的结束位置 if (!_PyEval_SliceIndexNotNone(args[2], &stop)) { goto exit; }\nskip_optional: // 调用 list_index_impl 查找元素 return_value = list_index_impl(self, value, start, stop); exit: // 返回 return return_value;\n} // Objects/listobject.c\nstatic PyObject *\nlist_index_impl(PyListObject *self, PyObject *value, Py_ssize_t start, Py_ssize_t stop)\n{ Py_ssize_t i; // 如果 start 小于 0，那么加上列表长度 if (start < 0) { start += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (start < 0) start = 0; } // 如果结束位置小于 0，那么加上列表长度，所以它们都支持负数索引 if (stop < 0) { stop += Py_SIZE(self); // 如果相加之后还小于 0，那么等于 0 if (stop < 0) stop = 0; } // 从 start 开始遍历 for (i = start; i < stop && i < Py_SIZE(self); i++) { // 获取对应元素 PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 然后进行比较，这个函数我们之前说过 // 它会先比较地址是否相同，如果地址相同，那么直接判定为相等 // 如果地址不同，那么比较值是否相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 相等返回 1，不相等返回 0，比较失败返回 -1 // 如果 cmp 大于 0，表示两者相等，返回索引 if (cmp > 0) return PyLong_FromSsize_t(i); else if (cmp < 0) return NULL; } // 到这里说明元素不存在，那么抛出 ValueError: x is not in list PyErr_Format(PyExc_ValueError, \"%R is not in list\", value); return NULL;\n} 所以列表 index 方法的时间复杂度为 O(n)，因为它在底层要循环整个列表，如果运气好，可能第一个元素就是；运气不好，就只能循环整个列表了。 然后需要注意的是，在比较的时候，会先判断地址是否相同，然后再比较值是否相等。 class A: def __eq__(self, other): return False a = A()\ndata = [a] print(a == data[0]) # False\nprint(data.index(a)) # 0 a 和 data[0] 指向的对象不相等，但 data.index(a) 却返回了相应的索引，因为两者保存的地址是相同的。 同理 if v in data 这种也是类似的，先比较地址，地址不同再比较维护的值。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » index：查询元素首次出现的位置","id":"156","title":"index：查询元素首次出现的位置"},"157":{"body":"列表有一个 count 方法，可以计算出某个元素出现的次数。 // Objects/clinic/listobject.c.h\n#define LIST_COUNT_METHODDEF \\ {\"count\", (PyCFunction)list_count, METH_O, list_count__doc__}, 它由 list_count 函数负责实现。 // Objects/listobject.c\nstatic PyObject *\nlist_count(PyListObject *self, PyObject *value)\n{ Py_ssize_t count = 0; Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { // 如果地址相同，直接判定为相等，count 自增 1 PyObject *obj = self->ob_item[i]; if (obj == value) { count++; continue; } Py_INCREF(obj); // 地址不同（a is b 不成立），则比较维护的值是否相等（看 a == b 是否成立） int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); if (cmp > 0) count++; else if (cmp < 0) return NULL; } // 返回元素出现的次数 return PyLong_FromSsize_t(count);\n} 毫无疑问，count 方法无论在什么情况下，它都是一个时间复杂度为 O(n) 的操作，因为列表必须要从头遍历到尾。 但还是要注意里面判断相等的方式，因为变量只是一个指针，所以 C 的 == 相当于 Python 的 is，但 Python 的 == 则对应 PyObject_RichCompare 函数。而源码里面在比较的时候先执行 ==，所以会先判断两者是不是指向同一个对象。 class A: def __eq__(self, other): return False a = A()\ndata = [a, a, a]\nprint(data[0] == a) # False\nprint(data[1] == a) # False\nprint(data[2] == a) # False print(data.count(a)) # 3 我们看到列表里的三个元素和 a 都不相等，但计算数量的时候，结果是 3。原因就是比较的时候是先比较地址，如果地址一样，那么认为元素相同。 当然 PyObject_RichCompareBool 函数里面已经包含了比较地址的逻辑，该函数会先比较地址是否一样，如果一样则认为相等，不一样再比较对象维护的值是否相等。但在 count 方法里面，将比较地址的逻辑又单独拿了出来，可以理解为快分支。当然即遍没有也无所谓，因为在函数 PyObject_RichCompareBool 里面还是会先对地址进行比较。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » count：查询元素出现的次数","id":"157","title":"count：查询元素出现的次数"},"158":{"body":"除了根据索引删除元素之外，也可以根据值来删除元素，会删除第一个出现的元素。 // Objects/clinic/listobject.c.h\n#define LIST_REMOVE_METHODDEF \\ {\"remove\", (PyCFunction)list_remove, METH_O, list_remove__doc__}, 它由 list_remove 函数实现。 // Objects/listobject.c\nstatic PyObject *\nlist_remove(PyListObject *self, PyObject *value)\n{ Py_ssize_t i; // 遍历每一个元素 for (i = 0; i < Py_SIZE(self); i++) { PyObject *obj = self->ob_item[i]; Py_INCREF(obj); // 比较是否相等，如果地址相同，那么认为相等 int cmp = PyObject_RichCompareBool(obj, value, Py_EQ); Py_DECREF(obj); // 如果相等，那么进行删除 if (cmp > 0) { // 可以看到在删除元素的时候，调用了 list_ass_slice // 等价于 self[i: i + 1] = [] if (list_ass_slice(self, i, i+1, (PyObject *)NULL) == 0) Py_RETURN_NONE; return NULL; } else if (cmp < 0) return NULL; } // 否则说明元素不在列表中，抛出 ValueError: list.remove(x): x not in list PyErr_SetString(PyExc_ValueError, \"list.remove(x): x not in list\"); return NULL;\n} 以上就是 remove 函数的底层实现，说白了就是一层 for 循环，依次比较列表的每个元素和待删除元素是否相等。如果出现了相等的元素，则删除，然后直接返回，因为只删除一个；但如果整个循环遍历结束也没有发现满足条件的元素，那么报错，待删除元素不存在。 所以背后的逻辑并没有我们想象中的那么神秘。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » remove：删除指定元素","id":"158","title":"remove：删除指定元素"},"159":{"body":"如果是你的话，你会怎么对列表进行翻转呢？显然是采用双指针，头指针指向列表的第一个元素，尾指针指向列表的最后一个元素，然后两两交换。交换完毕之后，头指针后移一位、尾指针前移一位，继续交换。当两个指针相遇时，停止交换，而 Python 底层也是这么做的。 // Objects/clinic/listobject.c.h\n#define LIST_REVERSE_METHODDEF \\ {\"reverse\", (PyCFunction)list_reverse, METH_NOARGS, list_reverse__doc__}, 它由 list_reverse 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_reverse(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_reverse_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_reverse_impl(PyListObject *self)\n{ // 如果列表长度不大于 1，那么什么也不做，直接返回 None 即可 if (Py_SIZE(self) > 1) // 大于 1 的话，执行 reverse_slice，传递了两个参数 // 第一个参数是底层数组首元素的地址 // 而第二个参数则是底层数组中索引为 ob_size 的元素的地址 // 但很明显能访问的最大索引应该是 ob_size - 1 才对啊 // 别急，我们继续往下看，看一下 reverse_slice 函数的实现 reverse_slice(self->ob_item, self->ob_item + Py_SIZE(self)); Py_RETURN_NONE;\n} static void\nreverse_slice(PyObject **lo, PyObject **hi)\n{ assert(lo && hi); // 我们看到又执行了一次 --hi // 让二级指针 hi 指向了索引为 ob_size - 1 的元素 --hi; // 数组元素的地址，从左往右是依次增大的 // 如果 lo < hi，证明 lo 依旧在 hi 的左边，那么交换指向的元素 // 如果 lo > hi，证明两者相遇了，交换结束 while (lo < hi) { // 交换指向的元素，下面三步等价于 *lo, *hi = *hi, *lo // 但 C 不支持这么写，它需要借助一个中间变量 PyObject *t = *lo; *lo = *hi; *hi = t; // 两个指针继续靠近，指向的元素继续交换，直到两个指针相遇 ++lo; --hi; }\n} 所以到现在，你还认为 Python 的列表神秘吗？虽然我们很难自己写出一个 Python 解释器，但是底层的一些思想其实并没有那么难，作为一名程序猿很容易想的到。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » reverse：翻转列表","id":"159","title":"reverse：翻转列表"},"16":{"body":"PyObject 是 Python 对象的核心，因为 Python 对象在 C 的层面就是一个结构体，并且所有的结构体都嵌套了 PyObject 结构体。而 PyObject 内部有引用计数和类型这两个字段，因此我们可以肯定的说 Python 的任何一个对象都有引用计数和类型这两个属性。 另外大部分对象都有长度的概念，所以又引入了 PyVarObject，它在 PyObject 的基础上添加了一个 ob_size 字段，用于描述对象的长度。比如字符串内部的 ob_size 维护的是字符串的字符个数，元组、列表、集合等等，其内部的 ob_size 维护的是存储的元素个数，所以使用 len 函数获取对象长度是一个 O(1) 的操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"4. 万丈高楼平地起，一切从 PyObject 开始 » 小结","id":"16","title":"小结"},"160":{"body":"将列表中的元素全部清空，让列表回到初始状态。 // Objects/clinic/listobject.c.h\n#define LIST_CLEAR_METHODDEF \\ {\"clear\", (PyCFunction)list_clear, METH_NOARGS, list_clear__doc__}, 它由 list_clear 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_clear(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_clear_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_clear_impl(PyListObject *self)\n{ _list_clear(self); Py_RETURN_NONE;\n} static int\n_list_clear(PyListObject *a)\n{ Py_ssize_t i; PyObject **item = a->ob_item; if (item != NULL) { // 获取列表的长度 i = Py_SIZE(a); // 将 ob_size 设置为 0 Py_SIZE(a) = 0; // ob_item 设置为 NULL a->ob_item = NULL; // 将容量设置为 0 a->allocated = 0; // 将列表中每个元素指向的对象的引用计数减 1 while (--i >= 0) { Py_XDECREF(item[i]); } // 释放底层数组所占的内存 PyMem_FREE(item); } return 0;\n} 过程非常简单，当列表为空时，除了将 ob_size 和 allocated 设置为 0 之外，还会将底层数组释放掉，减少内存占用。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » clear：清空列表","id":"160","title":"clear：清空列表"},"161":{"body":"调用列表的 copy 方法，可以将列表拷贝一份。 // Objects/clinic/listobject.c.h\n#define LIST_COPY_METHODDEF \\ {\"copy\", (PyCFunction)list_copy, METH_NOARGS, list_copy__doc__}, 它由 list_copy 负责实现。 // Objects/clinic/listobject.c.h\nstatic PyObject *\nlist_copy(PyListObject *self, PyObject *Py_UNUSED(ignored))\n{ return list_copy_impl(self);\n} // Objects/listobject.c\nstatic PyObject *\nlist_copy_impl(PyListObject *self)\n{ // 调用 list_slice，也就是基于切片获取元素 // 所以 data.copy() 等价于 data[:] return list_slice(self, 0, Py_SIZE(self));\n} static PyObject *\nlist_slice(PyListObject *a, Py_ssize_t ilow, Py_ssize_t ihigh)\n{ // 指向创建的新列表 PyListObject *np; // 指向列表的底层数组的首元素 PyObject **src, **dest; Py_ssize_t i, len; // 创建的新列表的长度 len = ihigh - ilow; // 创建底层数组长度为 len 的列表 np = (PyListObject *) list_new_prealloc(len); if (np == NULL) return NULL; src = a->ob_item + ilow; dest = np->ob_item; // 将原始列表中的元素依次拷贝到新列表中 for (i = 0; i < len; i++) { PyObject *v = src[i]; Py_INCREF(v); dest[i] = v; } // 将新列表的 ob_size 设置为 len Py_SIZE(np) = len; // 转成泛型指针之后返回 return (PyObject *)np;\n} 过程非常简单，但列表的 copy 方法或者说 data[:] 这种叫做列表的浅拷贝。关于列表的深浅拷贝也是初学者容易犯的错误之一，我们看一个 Python 的例子。 data = [[]] # 默认是浅拷贝，这个过程会创建一个新列表\n# 但我们说列表里面的元素都是指针，因此只会将里面的指针拷贝一份\n# 而指针指向的内存并没有拷贝\ndata_cp = data.copy() # 两个对象的地址是一样的\nprint(id(data[0]), id(data[0])) \"\"\"\n1338344668224 1338344668224\n\"\"\" # 操作 data[0], 会改变 data_cp[0]\ndata[0].append(123)\nprint(data, data_cp)\n\"\"\"\n[[123]] [[123]]\n\"\"\" # 操作 data_cp[0]，会改变 data[0]\ndata_cp[0].append(456)\nprint(data, data_cp)\n\"\"\"\n[[123, 456]] [[123, 456]]\n\"\"\" 之所以会有这样的现象，是因为 Python 的变量、容器里面的元素都是泛型指针 PyObject *，在传递的时候会传递指针， 但是在操作的时候会操作指针指向的内存。所以 data.copy() 就是创建了一个新列表，然后把元素拷贝了过去，只不过元素都是指针。因为只是拷贝指针，没有拷贝指针指向的对象（内存），因此它们指向的是同一个对象。 但如果我们就想在拷贝指针的同时也拷贝指针指向的对象呢？答案是使用一个叫 copy 的模块。 import copy data = [[]]\n# 此时拷贝的时候，会把指针指向的对象也给拷贝一份\ndata_cp1 = copy.deepcopy(data)\ndata_cp2 = data[:] data[0].append(123)\nprint(data_cp1) # [[]]\nprint(data_cp2) # [[123]] # data[:] 这种方式也是浅拷贝，所以修改 data[0]，会影响 data_cp2[0]\n# 但是没有影响 data_cp1[0]，证明它们是相互独立的，因为指向的是不同的对象 浅拷贝示意图如下： 里面的两个指针数组存储的元素是一样的，都是同一个对象的地址。 深拷贝示意图如下： 里面的两个指针数组存储的元素是不一样的，因为是不同对象的地址。 注意：copy.deepcopy 虽然在拷贝指针的同时会将指针指向的对象也拷贝一份，但这仅仅是针对可变对象，而不可变对象是不会拷贝的。 import copy data = [[], \"古明地觉\"]\ndata_cp = copy.deepcopy(data) print(data[0] is data_cp[0]) # False\nprint(data[1] is data_cp[1]) # True 为什么会这样，其实原因很简单。因为不可变对象是不支持本地修改的，你若想修改只能创建新的对象并指向它。但这对其它的变量而言则没有影响，其它变量该指向谁就还指向谁。 因为 b = a 只是将 a 存储的对象的指针拷贝一份给 b，然后 a 和 b 都指向了同一个对象，至于 a 和 b 本身则是没有任何关系的。如果此时 a 指向了新的对象，是完全不会影响 b 的，b 还是指向原来的对象。 因此，如果一个指针指向的对象不支持本地修改，那么深拷贝不会拷贝对象本身，因为指向的是不可变对象，所以不会有修改一个影响另一个的情况出现。 关于列表还有一些陷阱： data = [[]] * 5\ndata[0].append(1)\nprint(data) # [[1], [1], [1], [1], [1]]\n# 列表乘上一个 n，等于把列表里面的元素重复 n 次\n# 但列表里面存储的是指针，也就是将指针重复 n 次\n# 所以上面的列表里面的 5 个指针存储的地址是相同的\n# 也就是说，它们都指向了同一个列表 # 这种方式创建的话，里面的指针都指向了不同的列表\ndata = [[], [], [], [], []]\ndata[0].append(1)\nprint(data) # [[1], [], [], [], []] # 再比如字典，在后续系列中会说\nd = dict.fromkeys([1, 2, 3, 4], [])\nprint(d) # {1: [], 2: [], 3: [], 4: []}\nd[1].append(123)\nprint(d) # {1: [123], 2: [123], 3: [123], 4: [123]}\n# 它们都指向了同一个列表 类似的陷阱还有很多，因此在工作中要注意，否则一不小心就会出现大问题。 总之记住三句话： 虽然 Python 一切皆对象，但我们拿到的其实是指向对象的指针； 变量在传递的时候本质上是将对象的指针拷贝一份，所以 Python 是变量的赋值传递、对象的引用传递； 操作变量（指针）的时候，会自动操作变量（指针）指向的内存。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » copy：列表的拷贝","id":"161","title":"copy：列表的拷贝"},"162":{"body":"到此关于列表的内容就介绍完了，作为 Python 中的万能容器，我们可以自由地添加、修改和删除元素。但在使用的时候要了解它的底层结构以及元素是如何存储的，应该在什么场景下使用列表，它的每个方法的时间复杂度是多少。 下一篇文章来介绍元组，或许你觉得自己在代码中很少创建元组，但其实它无处不在。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"37. 列表都有哪些自定义方法，它们是怎么实现的？ » 小结","id":"162","title":"小结"},"163":{"body":"本篇文章来聊一聊元组，元组可以简单理解为不支持元素添加、修改、删除等操作的列表，也就是在列表的基础上移除了增删改操作。 所以从功能上来讲，元组只是列表的子集，那元组存在的意义是什么呢？首先元组可以作为字典的 key 以及集合的元素，因为字典和集合使用的数据结构是哈希表，它存储的元素一定是可哈希的，关于字典和集合我们后续章节会说。 而列表可以动态改变，所以列表不支持哈希。因此当我们希望字典的 key 是一个序列时，显然元组再适合不过了。比如要根据年龄和身高统计人数，那么就可以将年龄和身高组成元组作为字典的 key，人数作为字典的 value。所以元组可哈希，能够作为哈希表的 key，是元组存在的意义之一。当然元组还有其它作用，我们稍后再说。 元组如果可哈希，那么元组存储的元素必须都是可哈希的。只要有一个元素不可哈希，那么元组就会不可哈希。比如元组里面存储了一个列表，由于列表不可哈希，导致存储了列表的元组也会变得不可哈希。","breadcrumbs":"38. 解密元组的实现原理 » 楔子","id":"163","title":"楔子"},"164":{"body":"根据我们使用元组的经验，可以得出元组是一个变长对象，但同时又是一个不可变对象。 // Include/cpython/tupleobject.h\ntypedef struct { PyObject_VAR_HEAD PyObject *ob_item[1];\n} PyTupleObject; 以上是元组在底层对应的结构体，包含引用计数、类型、ob_size、指针数组。然后数组声明的长度虽然是 1，但我们可以当成 n 来用。然后我们再通过结构体的定义，来对比一下它和列表的区别。 元组没有 allocated、也就是容量的概念，这是因为它是不可变的，不支持 resize 操作。 元组对应的指针数组是定义在结构体里面的，可以直接对数组进行操作。而列表对应的指针数组是定义在结构体外面的，两者通过二级指针进行关联，也就是通过二级指针来间接操作指针数组。 至于为什么要这么定义，我们在最开始介绍对象模型的时候也说得很详细了。可变对象的具体元素不会保存在结构体内部，而是会维护一个指针，指针指向的内存区域负责存储元素。当发生扩容时，只需改变指针指向即可，从而方便内存管理。 基于结构体的定义，我们也能分析出元组所占的内存大小，显然它等于 24 + 8 * 元组长度。 >>> ().__sizeof__()\n24\n>>> (1,).__sizeof__()\n32\n>>> (1, 2).__sizeof__()\n40 结果没有问题。","breadcrumbs":"38. 解密元组的实现原理 » 元组的底层结构","id":"164","title":"元组的底层结构"},"165":{"body":"元组支持的操作我们就不看了，因为它只支持查询操作，并且和列表是高度相似的。这里我们直接来看元组的创建过程。正如列表一样，解释器为创建 PyTupleObject 也提供了类似的初始化方法，即 PyTuple_New。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // 参数 size 表示元组的长度 // op 指向创建的元组 PyTupleObject *op; // 循环变量 Py_ssize_t i; // size 必须大于等于 0 if (size < 0) { PyErr_BadInternalCall(); return NULL; } // PyTuple_MAXSAVESIZE 是一个宏，显然和缓存池相关 // 关于缓存池我们一会儿再说\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { free_list[size] = (PyTupleObject *) op->ob_item[0]; numfree[size]--; _Py_NewReference((PyObject *)op); } else\n#endif // 当不使用缓存池时，要在系统堆上申请内存 { // size * sizeof(PyObject *) + sizeof(PyTupleObject) 便是元组大小 // 该值不能超过 PY_SSIZE_T_MAX，否则报错 if ((size_t)size > ((size_t)PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)) / sizeof(PyObject *)) { return PyErr_NoMemory(); } // 为 PyTupleObject 和长度为 size 的指针数组申请内存 // 然后将它的类型设置为 &PyTuple_Type，将 ob_size 设置为 size op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size); if (op == NULL) return NULL; } // 将指针数组中所有元素设置为 NULL for (i=0; i < size; i++) op->ob_item[i] = NULL;\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); /* extra INCREF so that this is never freed */ }\n#endif // 让 GC 进行跟踪 _PyObject_GC_TRACK(op); // 转成泛型指针之后返回 return (PyObject *) op;\n} 相信这种代码逻辑现在对你来说已经没有任何难度了，另外源码中还有几个宏，不过不重要，因此这里直接去掉了。 以上就是元组创建的过程，但里面隐藏了很多的细节没有说，下面我们来介绍元组的缓存池，然后将细节一一揭开。","breadcrumbs":"38. 解密元组的实现原理 » 元组是怎么创建的？","id":"165","title":"元组是怎么创建的？"},"166":{"body":"元组的缓存池也是通过数组来实现的。 // Objects/tupleobject.c #define PyTuple_MAXSAVESIZE 20\n#define PyTuple_MAXFREELIST 2000 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];\nstatic int numfree[PyTuple_MAXSAVESIZE]; 里面出现了两个宏： PyTuple_MAXSAVESIZE：缓存池的大小，默认为 20； PyTuple_MAXFREELIST：缓存池的每个元素都对应一条链表，该宏表示每条链表最多容纳多少个节点（稍后解释）； 从定义中可以看到，元组的缓存池大小是 20，而我们之前介绍的列表的缓存池大小是 80。但这里的 20 和 80 还稍微有些不同，80 指的是列表缓存池的大小，除此之外没有别的含义。而 20 除了表示元组缓存池的大小之外，它还表示只有当元组的长度小于 20，回收时才会被放入缓存池。 当元组的长度为 n 时（其中 n < 20)，那么在回收的时候该元组就会放在缓存池中索引为 n 的位置。假设回收的元组长度为 6，那么就会放在缓存池索引为 6 的位置。 但是问题来了，如果要回收两个长度为 6 的元组该怎么办？很简单，像链表一样串起来就好了。所以 free_list 里面虽然存储的是 PyTupleObject *，但每个 (PyTupleObject *)->ob_item[0]都存储了下一个 PyTupleObject *。 因此你可以认为 free_list 存储了 20 条链表的头结点的指针，每条链表上面挂着具有相同 ob_size 的 PyTupleObject。比如 free_list[n] 便指向了长度为 n 的 PyTupleObject 组成的链表的头结点，至于每条链表的节点个数由 numfree 维护，并且最大不能超过 PyTuple_MAXFREELIST，默认是 2000。 这里再来重新捋一下，元组的缓存池是一个数组，并且索引为 n 的位置回收的是元素个数（ob_size）为 n 的元组，并且 n 不超过 20。但这样的话，具有相同长度的元组不就只能缓存一个了吗？比如我们有很多个长度为 2 的元组都要缓存怎么办呢？显然将它们以链表的形式串起来即可，正如图中显示的那样。至于长度为 n 的元组究竟缓存了多少个，则由 numfree[n] 负责维护。假设 free_list[2] 这条链表上挂了 1000 个 PyTupleObject，那么 numfree[2] 就等于 1000，即长度为 2 的元组被缓存了 1000 个。 当再回收一个长度为 2 的元组时，那么会让该元组的 ob_item[0] 等于 free_list[2]，然后 free_list[2] 等于该元组、numfree[2]++。所以这里的每一条链表和浮点数缓存池是类似的，也是采用的头插法。 我们看一下放入缓存池的具体过程，显然这一步发生在元组销毁的时候。 // Objects/tupleobject.c\nstatic void\ntupledealloc(PyTupleObject *op)\n{ // 循环变量 Py_ssize_t i; // 回收的元组的长度 Py_ssize_t len = Py_SIZE(op); // 让 GC 不再跟踪 PyObject_GC_UnTrack(op); // 延迟释放，和列表是类似的 Py_TRASHCAN_BEGIN(op, tupledealloc) if (len > 0) { i = len; // 减少内部元素指向对象的引用计数，因为元组不再持有对它们的引用 while (--i >= 0) Py_XDECREF(op->ob_item[i]);\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度必须小于 20，即元组长度不超过 20 // 并且 numfree[index] 必须小于 2000，即每条链表最多缓存 2000 个元组 if (len < PyTuple_MAXSAVESIZE && numfree[len] < PyTuple_MAXFREELIST && Py_TYPE(op) == &PyTuple_Type) { // ob_item[0] 充当了链表的 next 指针 // 这里让 op->ob_item[0] 等于 free_list[index] // 然后让 free_list[index] 等于 op // 这样元组就缓存起来了，并成为链表新的头结点，即 free_list[index] op->ob_item[0] = (PyObject *) free_list[len]; // 然后维护一下链表的节点个数 numfree[len]++; free_list[len] = op; goto done; /* return */ }\n#endif } // 如果元组长度大于等于 20，或者缓存池已满，那么释放内存 Py_TYPE(op)->tp_free((PyObject *)op);\ndone: Py_TRASHCAN_END\n} tupledealloc 函数在销毁元组时，会尝试放入缓存池中。那么同理，在创建元组时，也会尝试从缓存池中获取。我们再回过头看一下 PyTuple_New 这个函数，重新解释一下里面的细节。 // Objects/tupleobject.c\nPyObject *\nPyTuple_New(Py_ssize_t size)\n{ // ...\n#if PyTuple_MAXSAVESIZE > 0 // 回收的元组的长度为 0 时比较特殊，一会单独说 if (size == 0 && free_list[0]) { op = free_list[0]; Py_INCREF(op); return (PyObject *) op; } // 当 0 < size < 20 时，直接通过 op = free_list[size] 从缓存池获取 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) { // 元组取走后，别忘记让 free_list[size] 指向下一个元素 // 也就是 (PyTupleObject *) op->ob_item[0] free_list[size] = (PyTupleObject *) op->ob_item[0]; // 维护对应的链表长度 numfree[size]--; // 引用计数初始化为 1 _Py_NewReference((PyObject *)op); } else\n#endif // ...\n#if PyTuple_MAXSAVESIZE > 0 if (size == 0) { free_list[0] = op; ++numfree[0]; Py_INCREF(op); }\n#endif _PyObject_GC_TRACK(op); return (PyObject *) op;\n} 到此，相信你已经明白元组的缓存池到底是怎么一回事了，说白了就是有 20 条链表，索引为 n 的链表存放长度为 n 的元组，因此可回收的元组的最大长度是 19。然后每条链表的长度小于 2000，也就是具有相同长度的元组最多回收 2000 个。至于链表的 next 指针，则由元组的 ob_item[0] 来充当，通过 ob_item[0] 来获取下一个元素。 >>> tpl = (1, 2, 3)\n>>> print(id(tpl))\n2279295395264\n>>>\n>>> del tpl # 放入缓存池\n>>>\n>>> tpl = (\"古明地觉\", \"古明地恋\", \"芙兰朵露\")\n>>> print(id(tpl))\n2279295395264 可以看到打印的地址是一样的，因为第一次创建的元组被重复利用了。 另外我们说缓存池的长度为 20，会缓存长度为 0 ~ 19 的元组，每种规格的元组最多缓存 2000 个。其实这个说法不太严谨，应该说长度为 1 ~ 19 的元组会缓存 2000 个。如果元组长度为 0，那么它对应的链表只会容纳一个元素，这也说明了不管我们创建多少个空元组，最终在内存中只会存在一个。 tpl1 = ()\ntpl2 = ()\ntpl3 = () print(id(tpl1) == id(tpl2) == id(tpl3)) # True 再来看看 PyTuple_New 这个函数： 从缓存池中获取之后只是增加了引用计数，因为长度为 0 的元组只会缓存一个。所以空元组可以认为是单例的，只有一份。 那么问题来了，为什么元组缓存池可以缓存的元组个数会这么多，每个链表缓存 2000 个，有 20 条链表，总共可以缓存将近 40000 个。这么做的原因就是，元组的使用频率远比我们想象的广泛，主要是它大量使用在我们看不到的地方。比如多元赋值： a, b, c, d = 1, 2, 3, 4 在编译时，上面的 1, 2, 3, 4 实际上是作为元组被加载的，整个赋值相当于元组的解包。再比如函数、方法的返回值，如果是多返回值，本质上也是包装成一个元组之后再返回。 所以元组缓存池能缓存的对象个数，要远大于其它对象的缓存池。可以想象一个大型项目，里面的函数、方法不计其数，只要是多返回值，就会涉及到元组的创建，因此每种长度的元组缓存 2000 个是很合理的。当然如果长度达到了 20，就不会缓存了，这种元组的使用频率没有那么高。 然后再回顾一下元组的回收过程，会发现它和列表有一个很大的不同。列表在被回收时，它的指针数组会被释放；但元组不同，它在被回收时，底层的指针数组会保留，并且还巧妙地通过索引来记录了回收的元组的大小规格。元组的这项技术也被称为静态资源缓存，因为元组在执行析构函数时，不仅对象本身没有被回收，连底层的指针数组也被缓存起来了。那么当再次分配时，速度就会快一些。 from timeit import timeit t1 = timeit(stmt=\"x1 = [1, 2, 3, 4, 5]\", number=1000000)\nt2 = timeit(stmt=\"x2 = (1, 2, 3, 4, 5)\", number=1000000) print(round(t1, 2)) # 0.05\nprint(round(t2, 2)) # 0.01 可以看到耗时，元组只是列表的五分之一。这便是元组的另一个优势，可以将资源缓存起来。而缓存的原因还是如上面所说，因为涉及大量的创建和销毁，所以这一切都是为了加快内存分配。 由于对象都在堆区，为了效率，Python 不得不大量使用缓存的技术。","breadcrumbs":"38. 解密元组的实现原理 » 元组的缓存池","id":"166","title":"元组的缓存池"},"167":{"body":"以上就是元组相关的内容，因为有了列表相关的经验，再来看元组就会快很多。当然啦，元组的一些操作我们没有说，因为和对应的列表操作是类似的。 最后再补充一下，列表是有 __init__ 方法的，而元组没有。 元组的 __init__ 直接继承 object.__init__。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"38. 解密元组的实现原理 » 小结","id":"167","title":"小结"},"168":{"body":"Python 的字典是一种映射型容器对象，保存了键（key）到值（value）的映射关系。通过字典，我们可以实现快速查找，JSON 这种数据结构也是借鉴了 Python 的字典。另外字典是经过高度优化的，因为 Python 底层也在大量地使用字典。 在 Python 里面我们要如何创建一个字典呢？ # 创建一个字典\nd = {\"a\": 1, \"b\": 2}\nprint(d) # {'a': 1, 'b': 2} # 或者我们还可以调用 dict，传入关键字参数即可\nd = dict(a=1, b=2, c=3, d=4)\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然 dict 里面还可以接收位置参数，但是最多接收一个\nd1 = dict({\"a\": 1, \"b\": 2}, c=3, d=4)\nd2 = dict([(\"a\", 1), (\"b\", 2)], c=3, d=4)\nprint(d1) # {'a': 1, 'b': 2, 'c': 3, 'd': 4}\nprint(d2) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 还可以根据已有字典创建新的字典\nd = {**{\"a\": 1, \"b\": 2}, \"c\": 3, **{\"d\": 4}}\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} # 当然通过调用 dict 也是可以的\n# 但是注意：** 这种方式本质上是把字典变成多个关键字参数\n# 所以里面的 key 一定要符合 Python 的变量命名规范\nd = dict(**{\"a\": 1, \"b\": 2}, c=3, **{\"d\": 4})\nprint(d) # {'a': 1, 'b': 2, 'c': 3, 'd': 4} try: # 这种是不合法的，因为 **{1: 1} 等价于 1=1 d = dict(**{1: 1})\nexcept Exception as e: print(e) # keywords must be strings\n# 但下面是合法的\nd = {**{1: 1, 2: 2}}\nprint(d) # {1: 1, 2: 2} 字典的底层是借助哈希表实现的，关于哈希表我们一会儿说，总之字典添加元素、删除元素、查找元素等操作的平均时间复杂度是 O(1)。 我们来测试一下字典的执行效率吧，看看它和列表之间的区别。 import time\nimport numpy as np def test(count: int, value: int): \"\"\" :param count: 循环次数 :param value: 查询的元素 :return: \"\"\" # 包含一千个随机数的列表 lst = list(np.random.randint(0, 2 ** 30, size=1000)) # 基于列表构建一个字典 d = dict.fromkeys(lst) # 查询元素 value 是否在列表中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in lst t2 = time.perf_counter() print(\"列表查询耗时:\", round(t2 - t1, 2)) # 查询元素 value 是否在字典中，循环 count 次，并统计时间 t1 = time.perf_counter() for _ in range(count): value in d t2 = time.perf_counter() print(\"字典查询耗时:\", round(t2 - t1, 2)) # 分别查询一千次、一万次、十万次、二十万次\ntest(10 ** 3, 22333)\n\"\"\"\n列表查询耗时: 0.13\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 4, 22333)\n\"\"\"\n列表查询耗时: 1.22\n字典查询耗时: 0.0\n\"\"\"\ntest(10 ** 5, 22333)\n\"\"\"\n列表查询耗时: 12.68\n字典查询耗时: 0.01\n\"\"\"\ntest(10 ** 5 * 2, 22333)\n\"\"\"\n列表查询耗时: 25.72\n字典查询耗时: 0.01\n\"\"\" 字典的查询速度非常快，从测试中我们看到，随着循环次数越来越多，列表所花费的总时间越来越长。但是字典由于查询所花费的时间极少，查询速度非常快，所以即便循环 50 万次，花费的总时间也不过才 0.01 秒左右。 此外字典还有一个特点，就是它的快不会受到数据量的影响，从含有一万个键值对的字典中查找，和从含有一千万个键值对的字典中查找，两者花费的时间几乎是没有区别的。 那么哈希表到底是什么样的数据结构，为什么能这么快呢？下面来分析一下。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 楔子","id":"168","title":"楔子"},"169":{"body":"映射型容器的使用场景非常广泛，基本上所有的主流语言都支持。例如 C++ 里面的 map 就是一种映射型容器，但它是基于红黑树实现的。红黑树是一种平衡二叉树，元素的插入、删除、查询等操作的时间复杂度均为 O(logN)，另外 Linux 的 epoll 也使用了红黑树。 而对于 Python 来讲，映射型容器指的就是字典，我们说字典在 Python 内部是被高度优化的。因为不光我们在用，虚拟机在运行时也在大量使用，比如类对象、自定义类的实例对象都有自己的属性字典，还有全局变量也是通过字典存储的。因此基于以上种种原因，Python 对字典的性能要求会更加苛刻。 所以 Python 字典采用的数据结构，在添加、删除、查询元素等方面肯定是要优于红黑树的，没错，就是哈希表。其原理是将 key 通过哈希函数进行运算，得到一个哈希值，再将这个哈希值映射成索引。 我们举例说明： 我们发现除了 key、value 之外，还有一个 index，因为哈希表本质上也是使用了索引。虽然数组在遍历的时候是个时间复杂度为 O(n) 的操作，但通过索引定位元素则是一个 O(1) 的操作，不管数组有多长，通过索引总是能瞬间定位到指定元素。 所以哈希表本质上就是一个数组，通过将 key 映射成一个数值，作为数组的索引，然后将键值对存在数组里面。至于它是怎么映射的，我们后面再谈，现在就假设是按照我们接下来说的方法映射的。 比如这里有一个能容纳 8 个元素的字典，如上图所示。我们先设置 d[\"koishi\"]=79，那么会对 \"koishi\" 这个字符串进行哈希运算，得到一个哈希值，然后再让哈希值对当前的总容量进行取模，这样的话是不是能够得到一个小于 8 的数呢？假设是 3，那么就存在索引为 3 的位置。 然后 d[\"scarlet\"]=95，按照同样的规则运算得到 6，那么就存在索引为 6 的位置；同理第三次设置 d[\"satori\"]=80，对字符串 satori 进行哈希、取模，得到 1，那么存储在索引为 1 的位置。 同理当我们根据键来获取值的时候，比如：d[\"satori\"]，那么同样会对字符串 \"satori\" 进行哈希、取模，得到索引发现是1，然后就把索引为 1 的 value 给取出来。 当然这种方式肯定存在缺陷，比如： 不同的 key 进行哈希、取模运算之后得到的结果一定是不同的吗？ 在运算之后得到索引的时候，发现这个位置已经有人占了怎么办？ 取值的时候，索引为 1，可如果索引为 1 对应的 key 和我们指定的 key 不一致怎么办？ 所以哈希运算是会冲突的，如果冲突，那么 Python 底层会改变策略重新映射，直到映射出来的索引没有人用。比如我们设置一个新的键值对 d[\"tomoyo\"]=88，可是 \"tomoyo\" 这个 key 映射之后得到的结果也是 1，而索引为 1 的地方已经被 key 为 \"satori\" 的键值对给占了，那么 Python 就会改变规则来对 \"tomoyo\" 重新映射，直到找到一个空位置。 但如果我们再次设置 d[\"satori\"]=100，那么对 satori 映射得到的结果也是 1，而 key 是一致的，那么就会把对应的值进行修改。 同理，当我们获取值的时候，比如 d[\"tomoyo\"]，那么对 key 进行映射，得到索引。但是发现该索引对应的 key 不是 \"tomoyo\" 而是 \"satori\"，于是改变规则（这个规则跟设置 key 冲突时，采用的规则是一样的），重新映射，得到新的索引，然后发现 key 是一致的，于是将值取出来。 所以从这里就已经能说明问题了，就是把 key 转换成数组的索引。可能有人问，这些键值对貌似不是连续的啊。对的，肯定不是连续的。并不是说你先存，你的索引就小、就在前面，这是由 key 进行哈希运算之后的结果决定的。 另外哈希表、或者说字典也会扩容，并且它还不是像列表那样，容量不够才扩容，而是当键值对个数达到容量的三分之二的时候就会扩容。 因为字典不可能会像列表那样，键值对之间是连续、一个一个挨在一起的。既然是哈希运算，得到的哈希值肯定是随机的，再根据哈希值映射出的索引也是随机的。那么在键值对个数达到容量三分之二的时候，计算出来的索引发生碰撞的概率会非常大，不可能等到容量不够了再去扩容，而是在键值对个数达到容量的三分之二时就要扩容，也就是申请一个更大的哈希表。 一句话总结：哈希表就是一种空间换时间的方法。 假设容量为 1024，那么就相当于数组有 1024 个位置，每个 key 都会映射成索引，找到自己的位置，将键值对存在里面。但很明显各自的位置是不固定的，肯定会空出来很多，但是无所谓，只要保证通过索引能在相应的位置找到它即可。 大量的文字会有些枯燥，我们用两张图来解释一下设置元素和获取元素的整个过程。 以上是设置元素，还是比较清晰的，果然图像是个好东西。再来看看获取元素： 以上就是哈希表的基本原理，说白了它就是个数组。存储键值对的时候，先将 key 映射成索引，然后基于索引找到数组中的指定位置，将键值对存进去。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 什么是哈希表","id":"169","title":"什么是哈希表"},"17":{"body":"通过 PyObject 和 PyVarObject，我们看到了所有对象的公共信息以及变长对象的公共信息。任何一个对象，不管它是什么类型，内部必有引用计数（ob_refcnt）和类型指针（ob_type）。任何一个变长对象，不管它是什么类型，内部除了引用计数和类型指针之外，还有一个表示元素个数的 ob_size。 显然目前没有什么问题，一切都是符合预期的，但是当我们顺着时间轴回溯的话，就会发现端倪。比如： 当在内存中创建对象、分配空间的时候，解释器要给对象分配多大的空间？显然不能随便分配，那么对象的内存信息在什么地方？ 对象是可以执行相关操作的，解释器怎么知道某个对象支持哪些操作呢？再比如一个整数可以和一个整数相乘，一个列表也可以和一个整数相乘，即使是相同的操作，但不同类型的对象执行也会有不同的效果，那么此时解释器又是如何进行区分的？ 想都不用想，这些信息肯定都在对象的类型对象中。因为占用的空间大小实际上是对象的一个元信息，这样的元信息和其所属类型是密切相关的，因此它一定会出现在与之对应的类型对象当中。至于支持的操作就更不用说了，我们平时自定义类的时候，功能函数都写在什么地方，显然都是写在类里面，因此一个对象支持的操作也定义在类型对象当中。 而将对象和它的类型对象关联起来的，毫无疑问正是该对象内部的 PyObject 的 ob_type 字段，也就是类型指针。我们通过对象的 ob_type 字段即可获取类型对象的指针，然后通过指针获取存储在类型对象中的某些元信息。 下面我们来看看类型对象在底层是怎么定义的。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 楔子","id":"17","title":"楔子"},"170":{"body":"目前介绍的正是 Python 早期所采用的哈希表，但是它有一个严重的问题，就是内存浪费严重。下一篇文章我们就来看看字典的底层结构，以及 Python 是如何对哈希表进行优化的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"39. 聊一聊喜闻乐见的哈希表 » 小结","id":"170","title":"小结"},"171":{"body":"本篇文章来剖析一下字典的底层结构，看看它是怎么设计的，以及在设计的过程中都需要做哪些考量。另外字典是基于哈希表实现的，而传统的哈希表存在内存浪费的问题，那么字典又是如何优化的呢？带着这些问题，开始今天的内容。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 楔子","id":"171","title":"楔子"},"172":{"body":"Python 一切皆对象，字典也不例外，它在底层也由某个结构体表示。 // Include/cpython/dictobject.h\ntypedef struct { PyObject_HEAD Py_ssize_t ma_used; uint64_t ma_version_tag; PyDictKeysObject *ma_keys; PyObject **ma_values;\n} PyDictObject; 解释一下里面的字段的含义： PyObject_HEAD：对象的头部信息，里面包含了对象的引用计数和类型。 ma_used：字典的长度，它充当了 ob_size。 ma_version_tag：字典的版本号，对字典的每一次修改都会导致其改变。该字段主要用于字典的迭代器，以检测字典在迭代过程中是否被修改。 ma_keys：从定义上来看它是一个指针，指向了 PyDictKeysObject。而 Python 里面的哈希表分为两种，分别是 combined table 和 split table，即结合表和分离表。如果是结合表，那么键值对全部由 ma_keys 维护，此时 ma_values 为 NULL。 ma_values：如果是分离表，那么键由 ma_keys 维护，值由 ma_values 维护。而 ma_values 是一个二级指针，指向 PyObject * 类型的指针数组的首元素。 这里先解释一下结合表和分离表的由来。结合表的话，键和值会存在一起；分离表的话，键和值会存在不同的地方。那么问题来了，为什么要将哈希表分为两种呢？事实上，早期的哈希表只有结合表这一种，并且现在创建一个字典使用的也是结合表。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d = {\"a\": 1, \"b\": 2}\nprint( PyDictObject.from_address(id(d)).ma_values\n) # None 我们看到 ma_values 打印的结果是一个 None，证明是结合表，值不是由 ma_values 维护，而是和键一起，都由 ma_keys 负责维护。 而分离表是在 PEP-0412 中被引入的，主要是为了提高内存使用率，也就是让不同的字典共享相同的一组 key。比如自定义类的实例对象，它们默认都有自己的属性字典，如果对某个类多次实例化，那么改成分离表会更有效率。因为它们的属性名称是相同的，完全可以共享同一组 key；如果是结合表，那么每个实例的属性字典都要将相同的 key 单独保存一次，这显然是一种浪费。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] class A: pass a1 = A()\na2 = A() # 因为类型指定的是 void *，所以打印的结果是一串地址\n# 但我们看到输出不为 None，说明采用的确实是分离表\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_values, PyDictObject.from_address(id(a2.__dict__)).ma_values\n) # 139672411587664 139672411587280 # 然后再查看 ma_keys，既然是共享同一组 key\n# 那么打印的地址应该是一样的\nprint( PyDictObject.from_address(id(a1.__dict__)).ma_keys, PyDictObject.from_address(id(a2.__dict__)).ma_keys\n) # 139672411702528 139672411702528 # 结果确实是一样的，不同实例对象的属性字典里面的 key 是共享的\n# 因为是同一个类的实例对象，属性字典的 key 是相同的，所以没必要将同一组 key 保存多次 以上就是结合表和分离表之间的区别，只需要知道分离表是 Python 为了提高内存使用率而专门引入的即可。我们平时自己创建的字典，使用的都是结合表，因此我们的重点也将会放在结合表身上。 而结合表的话，键值都由 ma_keys 维护，它是一个指向 PyDictKeysObject 的指针，因此玄机就隐藏在这个结构体里面。 // Include/cpython/dictobject.h\ntypedef struct _dictkeysobject PyDictKeysObject; // Objects/dict-common.h\nstruct _dictkeysobject { // key 的引用计数，也就是 key 被多少个字典所使用 // 如果是结合表，那么该字段始终是 1，因为结合表独占一组 key // 如果是分离表，那么该字段大于等于 1，因为分离表可以共享一组 key Py_ssize_t dk_refcnt; // 哈希表的大小、或者说长度，注意：dk_size 满足 2 的 n 次方 // 这样可将取模运算优化成按位与运算，也就是将 num % dk_size 优化成 num & (dk_size - 1) Py_ssize_t dk_size; // 哈希函数，用于计算 key 的哈希值，然后映射成索引 // 一个好的哈希函数应该尽可能少的产生冲突，并且哈希函数对哈希表的性能起着至关重要的作用 // 所以底层的哈希函数有很多种，会根据对象的种类选择最合适的一个 dict_lookup_func dk_lookup; // 键值对数组还可以添加多少个 entry（键值对） // 关于什么是键值对数组，以及它和哈希索引数组之间有什么区别，稍后会解释 Py_ssize_t dk_usable; // 键值对数组里面已经添加了多少个键值对 Py_ssize_t dk_nentries; // 哈希索引数组 char dk_indices[]; // 注：dk_indices 后面其实还有一个字段 dk_entries，只不过没有写在结构体里面 // 从字段名也可以看出，它表示键值对数组，因此它的类型就是个数组 // 然后数组里面存储的是键值对（entry），而键值对在底层由 PyDictKeyEntry 结构体实现 // 所以你可以认为 char dk_indices[] 的下面还有一个 PyDictKeyEntry dk_entries[]\n}; 字典的定义还是稍微有点复杂的，如果目前感到困惑，没有关系，稍后我们会一点点解释清楚。这里再来看看键值对长什么样子。 // Objects/dict-common.h\ntypedef struct { Py_hash_t me_hash; PyObject *me_key; PyObject *me_value;\n} PyDictKeyEntry; 显然 me_key 和 me_value 指向了键和值，我们之前说 Python 的变量、以及容器内部的元素都是泛型指针 PyObject *，这里也得到了证明。但是我们看到 entry 除了有键和值之外，还有一个 me_hash，它表示键对应的哈希值，这样可以避免重复计算。 至此，字典的整个底层结构就非常清晰了，我们画一张图，然后再来从头解释一下，并解答之前留下的疑问。 字典的真正实现藏在 PyDictKeysObject 中，它的内部包含两个关键数组：一个是哈希索引数组 dk_indices，另一个是键值对数组 dk_entries。 字典维护的键值对（entry）会按照先来后到的顺序保存在键值对数组中，而哈希索引数组则保存键值对在键值对数组中的索引。另外，哈希索引数组中的一个位置我们称之为一个槽，比如图中的哈希索引数组便有 8 个槽，其数量由 dk_size 字段维护。 假设我们创建一个空字典，注意：虽然字典是空的，但是容量已经有了，然后往里面插入键值对 \"komeiji\": 99 的时候，Python 会执行以下步骤： 将键值对保存在 dk_entries 中，由于初始字典是空的，所以会保存在 dk_entries 数组中索引为 0 的位置。 通过哈希函数计算出 \"komeiji\" 的哈希值，然后将哈希值映射成索引，假设是 6。 将 \"键值对\" 在 \"键值对数组\" 中的索引 0，保存在哈希索引数组中索引为 6 的槽里面。 然后当我们在查找键 \"komeiji\" 对应的值的时候，便可瞬间定位。过程如下： 通过哈希函数计算出 \"komeiji\" 的哈希值，然后映射成索引。因为在设置的时候索引是 6，所以在获取时，映射出来的索引肯定也是 6。 找到哈希索引数组中索引为 6 的槽，得到其保存的 0，这里的 0 对应键值对数组的索引。 找到键值对数组中索引为 0 的位置存储的 entry，然后判断 entry->me_key 和查找的 key 是否一致，不一致则重新映射。如果一致，则取出 me_value，然后返回。 由于哈希值计算以及数组索引查找均是 O(1) 的时间复杂度，所以字典的查询速度才会这么快。 另外前面介绍哈希表的时候，为了避免牵扯太多，说得相对简化了。比如 \"xxx\": 80，假设 \"xxx\" 映射出来的索引是 2，那么键值对就直接存在索引为 2 的地方。这实际上是简化了，因为这相当于把哈希索引数组和键值对数组组合在一块了，而早期的 Python 也确实是这么做的。 但是从上面字典的结构图中我们看到，实际上是先将键值对按照先来后到的顺序存在一个数组（键值对数组）中，然后再将它在键值对数组中的索引存放在另一个数组（哈希索引数组）的某个槽里面，因为 \"xxx\" 映射出来的是 2，所以就存在索引为 2 的槽里面。 而在查找的时候，映射出来的索引其实是哈希索引数组的索引。然后索引为 2 的槽又存储了一个索引，这个索引是键值对数组的索引，会再根据该索引从键值对数组里面获取指定的 entry。最后比较 key 是否相同、如果相同则返回指定的 value。 所以能看出两者整体思想是基本类似的，理解起来区别不大，甚至第一种方式实现起来还更简单一些。但为什么要采用后者这种实现方式，以及这两者之间的区别，我们下面来专门分析，之所以采用后者主要是基于内存的考量。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的底层结构","id":"172","title":"字典的底层结构"},"173":{"body":"在早期，哈希表并没有分成两个数组实现，而是只由一个键值对数组实现，这个数组也承担哈希索引数组的角色。 我们看到这种结构不正是我们在介绍哈希表时说的吗？键值对数组不仅负责存储 entry，同时也负责承载映射后的索引，而无需分成两个数组，这种方式似乎更简单、更直观。没错，Python 在早期确实是通过这种方式实现的哈希表，只是这种实现方式有一个弊端，就是太耗费内存了。 前面说了，基于 key 映射出的索引是随机的，所以肯定会存在索引冲突的情况，即不同的 key 映射到了同一个槽。并且随着存储的 entry 增多，冲突也会越频繁，性能也就越差。因此哈希表必须要预留一定的空间，而经过实践表明，预留的空间至少要占总容量的 1/3。换句话说，哈希表存储的 entry 的数量不能超过总容量的 2/3。 // Objects/dictobject.c\n#define USABLE_FRACTION(n) (((n) << 1)/3) 宏 USABLE_FRACTION 会根据哈希表的长度，或者说容量，计算出哈希表可存储的元素个数。以长度为 8 的哈希表为例，最多可以保存 5 个键值对，超出则需要扩容，显然这存在严重的内存浪费。 所以 Python 为了节省内存，想出了一个妙招。既然只能用 2/3，那就将键值对数组的空间变为原来的 2/3，只用来存储键值对（entry），而对 key 进行映射得到的索引则由另一个数组（哈希索引数组）来承载。假设映射出的索引是 4，那么就去找哈希索引数组中索引为 4 的槽，该槽存储的便是键值对在键值对数组中的索引。 之所以这么设计，是因为键值对数组里面一个元素要占用 24 字节，而哈希索引数组在容量不超过 255 的时候，里面一个元素只占一个字节，容量不超过 65535 的时候，里面一个元素只占两个字节，其它以此类推。所以哈希索引数组里面的元素大小比键值对数组要小很多，将哈希表分成两个数组（避免键值对数组的浪费）来实现会更加节省内存。我们可以举个例子计算一下，假设有一个容量为 65535 的哈希表。 如果是通过第一种方式，只用一个数组来存储的话： # 总共需要 1572840 字节\n>>> 65535 * 24\n1572840 # 除以 3, 会浪费 524280 字节\n>>> 65535 * 24 // 3\n524280\n>>> 如果是通过第二种方式，使用两个数组来存储的话： # 容量虽然是 65535\n# 但键值对数组是容量的 2 / 3\n# 然后加上哈希索引数组的大小\n>>> 65535 * 24 * 2 // 3 + 65535 * 2\n1179630\n>>> 所以一个数组存储比两个数组存储要多用 393210 字节的内存，因此 Python 选择使用两个数组来存储。 我们再以长度为 8 的哈希表为例，画一张图对比一下，由于哈希表长度为 8，那么它最多存储 5 个键值对。 如果哈希表只使用一个键值对数组，那么基于 key 映射出的索引就是键值对数组的索引，这种方式简单直观，但内存浪费严重，因为要浪费掉 1/3 的空间。于是为了解决这个问题，哈希表选择使用两个数组实现，分别是哈希索引数组和键值对数组。 哈希索引数组的长度就是哈希表的长度，key 映射之后的索引也是哈希索引数组的索引，只不过它存储的不再是键值对，而是键值对在键值对数组中的索引。那么问题来了，明明多了一个数组，为啥内存占用反而变少了呢？很明显，由于引入了哈希索引数组，键值对数组的长度可以减少到原来的 2/3。 因为相比键值对数组，哈希索引数组的内存占用非常低，引入它需要的成本远小于避免键值对数组浪费 1/3 所带来的收益，所以使用两个数组来实现哈希表是更加合理的。 总结： 哈希表本质上就是个数组，只不过 Python 选择使用两个数组实现，其中哈希索引数组的长度便是哈希表的容量，而该长度由 dk_size 字段维护。 由于哈希表最多使用 2/3，那么就只为键值对数组申请 2/3 容量的空间。对于容量为 8 的哈希表，那么哈希索引数组的长度就是 8，键值对数组的长度就是 5。 dk_usable 字段表示键值对数组还可以容纳的 entry 的个数，所以它的初始值也是 5。 dk_nentries 字段表示当前已存在的 entry 的数量，假设哈希表，或者说键值对数组存储了 3 个键值对，那么 dk_nentries 就是 3。而 dk_usable 则会变成 5 - 3 等于 2，因为它表示键值对数组还可以容纳多少 entry。 咦，前面介绍 PyDictObject 的时候，看到里面有一个 ma_used 字段，表示字典的长度。那么 dk_nentries 和 ma_used 有啥区别呢，从字面意思上看，两者的含义貌似是等价的，关于这一点后续再解释。 最后就是 dk_indices 和 dk_entries，它们表示哈希索引数组和键值对数组。到此我们就把每个字段的含义又重新回顾了一遍，现在再来看是不是就清晰多了呢。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 哈希表的内存优化","id":"173","title":"哈希表的内存优化"},"174":{"body":"我们知道 Python 从 3.6 开始，字典的遍历是有序的，那么这是怎么实现的呢？ 其实很简单，在存储时，虽然映射之后的索引是随机的，但键值对本身始终是按照先来后到的顺序被添加进键值对数组中。而字典在 for 循环时，会直接遍历键值对数组，所以遍历的结果是有序的。但即便如此，我们也不应该依赖此特性。 还是以之前的图为例，我们顺序写入三个键值对，key 分别是 \"a\"、\"b\"、\"c\"： 早期的哈希表只有一个键值对数组，而键值对在存储时本身就是无序的，那么遍历的结果自然也是无序的。对于当前来说，遍历的结果就是 \"b\"、\"a\"、\"c\"。 但从 3.6 开始，键值对数组中的键值对，和添加顺序是一致的。而遍历时，会直接遍历键值对数组，因此遍历的结果是有序的。对于当前来说，遍历的结果就是 \"a\"、\"b\"、\"c\"。 当然，如果你是 Python 的设计者，希望遍历依旧不保持有序的话，那么该怎么做呢？很简单，可以先遍历哈希索引数组，将存储的有效索引依次取出，对于当前来说就是 1、0、2。然后基于这些索引，从键值对数组中获取键值对，那么遍历的结果也是 \"b\"、\"a\"、\"c\"。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典遍历的有序性","id":"174","title":"字典遍历的有序性"},"175":{"body":"下面来分析一下字典占用的内存大小，首先字典和列表一样都有容量的概念，由于空间已经申请了，不管有没有使用，大小都必须算进去。而字典的容量策略相比列表要简单很多，因为大小要满足 2 的 n 次方，所以容量一定按照 8、16、32、64、······ 进行变化。 注意：字典的容量（或者说哈希表的容量）指的是内部哈希索引数组的长度，它要满足 2 的 n 次方，从而将取模运算优化成按位与运算。当哈希索引数组存储的元素（键值对数组的索引）个数达到了总长度的 2/3，同时也意味着键值对数组已经满了，那么说明字典（哈希表）该扩容了。 知道了容量规则，我们来看一下字典的内存大小怎么计算。 typedef struct { PyObject_HEAD // 16 字节 Py_ssize_t ma_used; // 8 字节 uint64_t ma_version_tag; // 8 字节 PyDictKeysObject *ma_keys; // 8 字节 PyObject **ma_values; // 8 字节\n} PyDictObject;\n// 所以 PyDictObject 实例占 48 字节 struct _dictkeysobject { Py_ssize_t dk_refcnt; // 8 字节 Py_ssize_t dk_size; // 8 字节 dict_lookup_func dk_lookup; // 8 字节 Py_ssize_t dk_usable; // 8 字节 Py_ssize_t dk_nentries; // 8 字节 char dk_indices[]; // 隐藏字段 dk_entries\n}; // 如果不算哈希索引数组 dk_indices 和键值对数组 dk_entries\n// 那么 PyDictKeysObject 实例占 40 个字节 然后是剩余的两个数组，一个是哈希索引数组 dk_indices，里面 1 个元素可能占 1 字节、2 字节、或 4 字节；还有一个键值对数组 dk_entries，里面一个元素占 24 字节。所以对于容量为 n 的字典来说： 如果 n < 256，字典大小等于 48 + 40 + n + n * 2 // 3 * 24 如果 256 <= n < 65536，字典大小等于 48 + 40 + n * 2 + n * 2 // 3 * 24 如果 n >= 65536，字典大小等于 48 + 40 + n * 4 + n * 2 // 3 * 24 所以对于一个容量为 8 的字典，它的大小就是 48 + 40 + 8 + 120 = 216。 # 字典的初始容量为 8，所以大小为 216\n>>> dict().__sizeof__()\n216 # 注：如果你是通过字面量的方式创建空字典，那么容量是 0\n# 显然大小就是 48 字节，因为此时 ma_keys 为 NULL\n>>> {}.__sizeof__()\n48 那么问题来了，如果一个字典包含 78 个键值对，那么这个字典占多大内存呢？既然有 78 个键值对，那么键值对数组 dk_entries 的长度至少为 78，而它又等于哈希表容量的 2/3，所以哈希表的长度至少为 117。由于哈希表的长度满足 2 的 n 次幂，所以我们只需找到大于等于 117 的最小 2 的幂次方数即可，显然这个数是 128。 所以大小有了，包含 78 个键值对的字典所占的内存大小等于 48 + 40 + 128 + 128 * 2 // 3 * 24。 >>> 48 + 40 + 128 + 128 * 2 // 3 * 24\n2256\n>>> dict.fromkeys(range(78)).__sizeof__()\n2256 结果没有问题，再来个复杂点的，对于包含 12345 个键值对的字典，占用多大内存呢？ >>> import math\n>>> math.log2(12345 * 3 / 2)\n14.1766017167513\n>>> 2 ** 15\n32768 计算结果表明，对于包含 12345 个键值对的字典，哈希表的长度至少为 2 的 14.17... 次方，而实际的长度显然是 2 的 15 次方，那么大小就出来了。另外注意：因为长度超过了 255，所以哈希索引数组中的一个元素占两字节。 >>> 48 + 40 + 32768 * 2 + 32768 * 2 // 3 * 24\n589904\n>>> dict.fromkeys(range(12345)).__sizeof__()\n589904 结果和我们分析的一样，以上我们就计算出了字典的内存大小，你也可以自己创建个字典测试一下。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 字典的内存大小","id":"175","title":"字典的内存大小"},"176":{"body":"通过研究字典的具体实现，我们可以得出以下结论： 字典是一种高效的映射型容器，能够以 O(1) 的时间复杂度执行查询和写入操作； 字典之所以这么快，是因为它由哈希表实现。但快是要付出代价的，哈希表必须保证一定的稀疏性，否则会频繁出现索引冲突，导致哈希表性能下降，因为索引映射是随机的； 既然哈希表要保证稀疏性，就意味着内存开销大，因为存在内存浪费。 但 Python 为优化内存使用，选择基于两个数组来实现哈希表，通过避免键值对数组的浪费，来减少内存占用； 键值对数组里的 entry 除了保存 key 和 value 之外，还保存了 key 的哈希值。 以上就是字典的底层实现，但是还没有结束，哈希表的背后还隐藏了很多细节，我们就下一篇文章再聊吧。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"40. 字典是怎么实现的，它的底层结构长什么样子？ » 小结","id":"176","title":"小结"},"177":{"body":"通过研究字典的底层实现，我们找到了字典快速且高效的秘密，就是哈希表。而提到哈希表，必然绕不开哈希值，因为它决定了映射之后的索引。 如果想计算对象的哈希值，那么要保证对象必须是可哈希的。如果不可哈希，那么它就无法计算哈希值，自然也就无法作为字典的 key。那什么样的对象是可哈希的呢？ 因为哈希值不能发生改变，所以对象必须是不可变对象； 当对象的哈希值相等时，要判断对象是否相等，所以对象必须实现 __eq__ 方法； 所以如果对象满足不可变、并且实现了 __eq__ 方法，那么它就是可哈希的，只有这样的对象才能作为字典的 key 或者集合的元素。 像整数、浮点数、字符串等内置的不可变对象都是可哈希的，可以作为字典的 key。而像列表、字典等可变对象则不是可哈希的，它们不可以作为字典的 key。然后关于元组需要单独说明，如果元组里面的元素都是可哈希的，那么该元组也是可哈希的，反之则不是。 # 键是可哈希的就行，值是否可哈希则没有要求\nd = {1: 1, \"xxx\": [1, 2, 3], 3.14: 333} # 列表是可变对象，因此无法哈希\ntry: d = {[]: 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" # 元组也是可哈希的\nd = {(1, 2, 3): 123} # 但如果元组里面包含了不可哈希的对象\n# 那么整体也会变成不可哈希对象\ntry: d = {(1, 2, 3, []): 123}\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'list' \"\"\" 而我们自定义类的实例对象也是可哈希的，并且哈希值是通过对象的地址计算得到的。 class Some: pass s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n8744065697364 8744065697355\n\"\"\" 当然 Python 也支持我们重写哈希函数，比如： class Some: def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint(hash(s1), hash(s2))\n\"\"\"\n123 123\n\"\"\"\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x0000029C0ED045E0>: 1, <__main__.Some object at 0x0000029C5E116F20>: 2}\n\"\"\" 因为哈希值一样，映射出来的索引自然也是相同的，所以在作为字典的 key 时，会发生冲突。由于类的实例对象之间默认不相等，因此会改变规则重新映射，找一个可以写入的位置。 如果两个对象相等，它们的哈希值一定也相等。 注意：我们自定义类的实例对象默认都是可哈希的，但如果类里面重写了 __eq__，并且没有重写 __hash__ 的话，那么这个类的实例对象就不可哈希了。 class Some: def __eq__(self, other): return True try: hash(Some())\nexcept TypeError as e: print(e) \"\"\" unhashable type: 'Some' \"\"\" 为什么会有这种现象呢？首先上面说了，在没有重写 __hash__ 方法的时候，哈希值默认是根据对象的地址计算得到的。而且对象如果相等，那么哈希值一定是一样的，并且不可变。 但我们重写了 __eq__，相当于控制了 == 操作符的比较结果，两个对象是否相等就由我们来控制了，可哈希值却还是根据地址计算得到的。因为两个对象地址不同，所以哈希值不同，但是对象却可以相等、又可以不相等，这就导致了矛盾。所以在重写了 __eq__、但是没有重写 __hash__ 的情况下，其实例对象便不可哈希了。 但如果重写了 __hash__，那么哈希值就不再通过地址计算了，因此此时是可以哈希的。 class Some: def __eq__(self, other): return True def __hash__(self): return 123 s1 = Some()\ns2 = Some()\nprint({s1: 1, s2: 2})\n\"\"\"\n{<__main__.Some object at 0x00000202D7D945E0>: 2}\n\"\"\" 我们看到字典里面只有一个元素，因为重写了 __hash__ 方法之后，计算得到的哈希值都是一样的。如果没有重写 __eq__，实例对象之间默认是不相等的，因此哈希值一样，但是对象不相等，那么会重新映射。但我们重写了 __eq__，返回的结果是 True，所以 Python 认为对象是相等的，那么由于 key 的不重复性，只会保留一个键值对。 但需要注意的是，在比较相等时，会先比较地址是否一样，如果地址一样，那么哈希表会直接认为相等。 class Some: def __eq__(self, other): return False def __hash__(self): return 123 def __repr__(self): return \"Some Instance\" s1 = Some()\n# 我们看到 s1 == s1 为 False\nprint(s1 == s1)\n\"\"\"\nFalse\n\"\"\"\n# 但是只保留了一个 key，咦，两个 key 不相等，难道不应该重新映射吗？\n# 原因就是刚才说的，在比较是否相等之前，会先判断地址是否一样\n# 如果地址一样，那么认为是同一个 key，直接判定相等\nprint({s1: 1, s1: 2})\n\"\"\"\n{Some Instance: 2}\n\"\"\" s2 = Some()\n# 此时会保留两个 key，因为 s1 和 s2 地址不同，s1 == s2 也为 False\n# 所以哈希表认为这是两个不同的 key\n# 但由于哈希值一样，那么映射出来的索引也一样\n# 因此写入 s2: 2 时相当于发生了索引冲突，于是会重新映射\n# 但总之这两个 key 都会被保留\nprint({s1: 1, s2: 2}) \"\"\"\n{Some Instance: 1, Some Instance: 2}\n\"\"\" 同样的，我们再来看一个 Python 字典的例子。 d = {1: 123} d[1.0] = 234\nprint(d) # {1: 234} d[True] = 345\nprint(d) # {1: 345} 天哪噜，这是咋回事？首先整数在计算哈希值的时候，得到的结果就是其本身；而浮点数显然不是，但如果浮点数的小数点后面是 0，那么它和整数是等价的。 因此 1 和 1.0 的哈希值一样，并且两者也是相等的，因此它们被视为同一个 key，所以相当于是更新。同理 True 也一样，因为 bool 继承自 int，所以它等价于 1，比如：9 + True = 10。因此 True 和 1 相等，并且哈希值也相等，那么索引 d[True] = 345 同样相当于更新。 但是问题来了，值更新了我们可以理解，字典里面只有一个元素也可以理解，可为什么 key 一直是 1 呢？理论上最终结果应该是 True 才对啊。其实这算是 Python 偷了个懒吧（开个玩笑），因为 key 的哈希值是一样的，并且也相等，所以只会更新 value，而不会修改 key。 为了加深理解，我们再举个例子： d = {\"高老师\": 666} class A: def __hash__(self): return hash(\"高老师\") def __eq__(self, other): return True # A() == \"高老师\" 为 True，两者哈希值也一样\n# 所以相当于对 key 进行更新\nd[A()] = 777\nprint(d) # {'高老师': 777} print(d[\"高老师\"]) # 777\nprint(d[A()]) # 777 只要两个对象相等，并且哈希值相等，那么对于哈希表来说，它们就是同一个 key。 另外我们反复在提哈希值，而哈希值是通过哈希函数运算得到的，一个理想的哈希函数要保证哈希值尽量均匀地分布于整个哈希空间中，越是相近的值，其哈希值差别应该越大。还是那句话，哈希函数对哈希表的好坏起着至关重要的作用。 以上我们就详细地聊了聊对象的哈希值，如果对象可以计算哈希值，那么它一定实现了 __hash__ 方法，而内置的不可变对象都实现了。另外内置的哈希函数 hash，本质上也是调用了 __hash__。 print(hash(\"hello\"))\nprint(\"hello\".__hash__())\n\"\"\"\n-7465190714692855315\n-7465190714692855315\n\"\"\" 下一篇文章来聊一聊索引冲突是怎么解决的？ 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"41. 什么是可哈希对象，它的哈希值是怎么计算的？","id":"177","title":"41. 什么是可哈希对象，它的哈希值是怎么计算的？"},"178":{"body":"两个对象的哈希值相等，那么映射出的索引肯定相同。而如果哈希值不相等，映射出的索引也有可能相同，因为与哈希值空间相比，哈希表的槽位是非常有限的。如果不同的对象在经过映射之后，生成的索引相同，或者说它们被映射到了同一个槽，那么便发生了索引冲突。 解决索引冲突的常用方法有两种：分离链接法和开放寻址法。 分离链接法比较简单，如果有多个键值对映射到同一槽位，那么就用链表将它们串起来。然后是开放寻址法，这也是 Python 使用的方法，我们详细介绍一下。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 楔子","id":"178","title":"楔子"},"179":{"body":"首先将 key 映射成索引，但如果发现该索引对应的哈希槽被占了，那么就尝试另一个。 new_key 被映射到了索引为 5 的槽，但是该槽已经存储了键值对数组的索引，即该槽被占了。如果是分离链接法，那么会使用链表将两个 entry 串起来，但开放寻址法则是选择一个新的槽，也就是重新找个坑。 那么问题来了，新的槽要怎么找呢？一般来说，会在首槽的基础上增加一个偏移量，得到新的槽，如果还冲突，那么继续增加偏移量，直到找到一个可用的槽。总的来说就是一个不断探测的过程，每一次探测都会尝试增加偏移量。 所以新的问题又产生了，每次增加的偏移量是多少呢？其实这个问题取决于具体实现，如果偏移量是线性增加的，我们称之为线性探测；如果偏移量是平方增加的，我们称之为平方探测。 但不管是线性探测，还是平方探测，其实都不够好。因为偏移量始终是以一种固定的模式增加，这就导致映射到同一槽位的两个 key 的探测序列是相同的。 比如这里的 key1 和 key2，它们的哈希值不同，但都映射到了索引为 2 的槽，这是完全正常的，因为哈希表的槽位有限。而由于偏移量的增加方式是固定的，比如这里每次都增加 2，再加上首槽相同，因此它们的探测序列也相同，显然这会导致后续出现多次冲突。 所以 Python 对此进行了优化，探测函数在发现索引冲突时，不会简单地增加一个偏移量，而是会参考对象的哈希值，计算下一个候选位置，这就大大降低了冲突的可能性。 Python 的这种做法被称为迭代探测，当然迭代探测也属于开放寻址法的一种。所以当出现索引冲突时，Python 并不是简简单单地加上一个偏移量，而是使用专门设计的探测函数进行二次探查，也就是之前说的改变规则、重新映射，然后在函数内部会参考对象的哈希值来计算出一个新的索引。 在 dictobject.c 文件开头有着大量的注释，对字典进行了全局性的概括，当然具体细节我们都会详细说明。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 开放寻址法","id":"179","title":"开放寻址法"},"18":{"body":"PyObject 的 ob_type 字段的类型是 PyTypeObject *，所以类型对象由 PyTypeObject 结构体负责实现，看一看它长什么样子。 // Include/cpython/object.h typedef struct _typeobject { PyObject_VAR_HEAD const char *tp_name; Py_ssize_t tp_basicsize, tp_itemsize; destructor tp_dealloc; Py_ssize_t tp_vectorcall_offset; getattrfunc tp_getattr; setattrfunc tp_setattr; PyAsyncMethods *tp_as_async; reprfunc tp_repr; PyNumberMethods *tp_as_number; PySequenceMethods *tp_as_sequence; PyMappingMethods *tp_as_mapping; hashfunc tp_hash; ternaryfunc tp_call; reprfunc tp_str; getattrofunc tp_getattro; setattrofunc tp_setattro; PyBufferProcs *tp_as_buffer; unsigned long tp_flags; const char *tp_doc; traverseproc tp_traverse; inquiry tp_clear; richcmpfunc tp_richcompare; Py_ssize_t tp_weaklistoffset; getiterfunc tp_iter; iternextfunc tp_iternext; struct PyMethodDef *tp_methods; struct PyMemberDef *tp_members; struct PyGetSetDef *tp_getset; struct _typeobject *tp_base; PyObject *tp_dict; descrgetfunc tp_descr_get; descrsetfunc tp_descr_set; Py_ssize_t tp_dictoffset; initproc tp_init; allocfunc tp_alloc; newfunc tp_new; freefunc tp_free; inquiry tp_is_gc; PyObject *tp_bases; PyObject *tp_mro; PyObject *tp_cache; PyObject *tp_subclasses; PyObject *tp_weaklist; destructor tp_del; unsigned int tp_version_tag; destructor tp_finalize; vectorcallfunc tp_vectorcall; Py_DEPRECATED(3.8) int (*tp_print)(PyObject *, FILE *, int); #ifdef COUNT_ALLOCS Py_ssize_t tp_allocs; Py_ssize_t tp_frees; Py_ssize_t tp_maxalloc; struct _typeobject *tp_prev; struct _typeobject *tp_next;\n#endif\n} PyTypeObject; 类型对象在底层对应的是 struct _typeobject，或者说 PyTypeObject，它保存了实例对象的元信息。 所以不难发现，无论是 int、str、dict 等内置类型，还是使用 class 关键字自定义的类型，它们在 C 的层面都是由 PyTypeObject 这个结构体实例化得到的，只不过内部字段的值不同，PyTypeObject 结构体在实例化之后得到的类型对象也不同。 然后我们来看看 PyTypeObject 里面的字段都代表啥含义，字段还是比较多的，我们逐一介绍。 PyObject_VAR_HEAD 宏，会被替换为 PyVarObject，所以类型对象是一个变长对象。因此类型对象也有引用计数和类型，这与我们前面分析的是一致的。 tp_name 对应 Python 中类型对象的 __name__ 属性，即类型对象的名称。 # 类型对象在底层对应的是 PyTypeObject 结构体实例\n# 它的 tp_name 字段表示类型对象的名称\nprint(int.__name__) # int\n# 动态创建一个类\nA = type(\"我是 A\", (object,), {})\nprint(A.__name__) # 我是 A 所以任何一个类型对象都有 __name__ 属性，也就是都有名称。 tp_basicsize，tp_itemsize tp_basicsize：表示创建实例对象所需的基本内存大小； tp_itemsize：如果对象是变长对象，并且元素保存在对应的结构体内部，比如元组，那么 tp_itemsize 表示内部每个元素的内存大小。如果是定长对象，或者虽然是变长对象，但结构体本身不保存数据，而是只保存了一个指针，那么 tp_itemsize 为 0； tp_dealloc 析构函数，对应 Python 中类型对象的 __del__，会在实例对象被销毁时执行。 tp_vectorcall_offset 如果想调用一个对象，那么它的类型对象要定义 __call__ 函数。 class A: def __call__(self, *args, **kwargs): return \"被调用了\" a = A()\n# 如果调用 a，那么 type(a) 要定义 __call__ 函数\nprint(a())\n\"\"\"\n被调用了\n\"\"\"\n# 底层会转成如下逻辑\nprint(A.__call__(a))\n\"\"\"\n被调用了\n\"\"\" # 函数也是一个实例对象，它能被调用\n# 说明 type(函数) 也一定实现了 __call__\ndef some_func(name, age): return f\"name: {name}, age: {age}\"\n# 函数的类型是 function\nprint(type(some_func))\n\"\"\"\n<class 'function'>\n\"\"\"\n# 调用函数\nprint(some_func(\"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\"\n# 也可以这么做\nprint(type(some_func).__call__(some_func, \"古明地觉\", 17))\n\"\"\"\nname: 古明地觉, age: 17\n\"\"\" 以上就是对象最通用的调用逻辑，但通用也意味着平庸，这种调用方式的性能是不高的。自定义类的实例对象还好，因为需要支持调用的场景不多，而函数则不同，尽管它也是实例对象，但它生下来就是要被调用的。如果函数调用也走通用逻辑的话，那么效率不高，因此 Python 从 3.8 开始引入了 vectorcall 协议，即矢量调用协议，用于优化和加速函数调用。相比常规调用，矢量调用具备如下优势： 避免创建临时元组来传递参数 减少参数打包/解包的开销 支持关键字参数的快速处理 总之当一个对象被调用时，如果它支持 vectorcall 协议，那么会通过 tp_vectorcall_offset 找到实现矢量调用的函数指针。 注意：vectorcall 函数指针定义在实例对象中，而 tp_vectorcall_offset 字段维护了 vectorcall 函数指针在实例对象中的偏移量，该偏移量用于定位到一个特定的函数指针，这个函数指针符合 vectorcall 协议。 如果类型对象的 tp_vectorcall_offset 为 0，表示其实例对象不支持矢量调用，因此会退化为常规调用，即通过类型对象的 __call__ 进行调用。 tp_getattr，tp_setattr 对应 Python 中类型对象的 __getattr__ 和 __setattr__，用于操作实例对象的属性。但这两个字段已经不推荐使用了，因为它要求在操作属性时，属性名必须为 C 字符串，以及不支持通过描述符协议处理属性。 所以这两个字段主要用于兼容旧版本，现在应该使用 tp_getattro 和 tp_setattro。 tp_as_number、tp_as_sequence、tp_as_mapping、tp_as_async tp_as_number：实例对象为数值时，所支持的操作。这是一个结构体指针，指向的结构体中的每一个字段都是一个函数指针，指向的函数就是对象可以执行的操作，比如四则运算、左移、右移、取模等等。 tp_as_sequence：实例对象为序列时，所支持的操作，也是一个结构体指针。 tp_as_mapping：实例对象为映射时，所支持的操作，也是一个结构体指针。 tp_as_async：实例对象为协程时，所支持的操作，也是一个结构体指针。 tp_repr、tp_str 对应 Python 中类型对象的 __repr__ 和 __str__，用于控制实例对象的打印输出。 tp_hash 对应 Python 中类型对象的 __hash__，用于定义实例对象的哈希值。 tp_call 对应 Python 中类型对象的 __call__，用于控制实例对象的调用行为。当然这属于常规调用，而对象不仅可以支持常规调用，还可以支持上面提到的矢量调用（通过减少参数传递的开销，提升调用性能）。 但要注意的是，不管使用哪种调用协议，对象调用的行为必须都是相同的。因此一个对象如果支持矢量调用，那么它也必须支持常规调用，换句话说对象如果实现了 vectorcall，那么它的类型对象也必须实现 tp_call。 如果你在实现 vectorcall 之后发现它比 tp_call 还慢，那么你就不应该实现 vectorcall，因为实现 vectorcall 是有条件的，当条件不满足时性能反而会变差。 tp_getattro，tp_setattro 对应 Python 中类型对象的 __getattr__ 和 __setattr__。 tp_as_buffer 指向 PyBufferProcs 类型的结构体，用于共享内存。通过暴露出一个缓冲区，可以和其它对象共享同一份数据，因此当类型对象实现了 tp_as_buffer，我们也说其实例对象实现了缓冲区协议，举个例子。 import numpy as np buf = bytearray(b\"abc\")\n# 和 buf 共享内存\narr = np.frombuffer(buf, dtype=\"uint8\")\nprint(arr) # [97 98 99]\n# 修改 buf\nbuf[0] = 255\n# 会发现 arr 也改变了，因为它和 buf 共用一块内存\nprint(arr) # [255 98 99] 所以 tp_as_buffer 主要用于那些自身包含大量数据，且需要允许其它对象直接访问的类型。通过实现缓冲区协议，其它对象可以直接共享数据，而无需事先拷贝，这在处理大型数据或进行高性能计算时非常有用。 关于缓冲区协议，后续还会详细介绍。 tp_flags 对应 Python 中类型对象的 __flags__，负责提供类型对象本身的附加信息，通过和指定的一系列标志位进行按位与运算，即可判断该类型是否具有某个特征。 那么标志位都有哪些呢？我们介绍几个常见的。 // Include/object.h // 类型对象的内存是否是动态分配的\n// 像内置的类型对象属于静态类，它们不是动态分配的\n#define Py_TPFLAGS_HEAPTYPE (1UL << 9)\n// 类型对象是否允许被继承\n#define Py_TPFLAGS_BASETYPE (1UL << 10)\n// 类型对象的实例对象是否参与垃圾回收\n#define Py_TPFLAGS_HAVE_GC (1UL << 14)\n// 类型对象是否是抽象基类\n#define Py_TPFLAGS_IS_ABSTRACT (1UL << 20) 我们通过 Python 来演示一下。 # 是否是自定义的动态类\nPy_TPFLAGS_HEAPTYPE = 1 << 9\nclass A: pass\n# 如果与运算的结果为真，则表示是动态类，否则不是\nprint(A.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n512\n\"\"\"\nprint(int.__flags__ & Py_TPFLAGS_HEAPTYPE)\n\"\"\"\n0\n\"\"\" # 类型对象是否允许被继承\nPy_TPFLAGS_BASETYPE = 1 << 10\n# object 显然允许被继承，因此与运算的结果为真\nprint(object.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n1024\n\"\"\"\n# 但 memoryview 就不允许被继承\ntry: class B(memoryview): pass\nexcept TypeError as e: print(e) \"\"\" type 'memoryview' is not an acceptable base type \"\"\"\nprint(memoryview.__flags__ & Py_TPFLAGS_BASETYPE)\n\"\"\"\n0\n\"\"\" # 类型对象的实例对象是否参与垃圾回收\nPy_TPFLAGS_HAVE_GC = 1 << 14\n# int 的实例对象（整数）不会产生循环引用，所以不会参与垃圾回收\nprint(int.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n0\n\"\"\"\n# 但列表是会参与垃圾回收的\nprint(list.__flags__ & Py_TPFLAGS_HAVE_GC)\n\"\"\"\n16384\n\"\"\" # 类型对象是否是抽象基类\nPy_TPFLAGS_IS_ABSTRACT = 1 << 20\nfrom abc import ABCMeta, abstractmethod\n# 显然 C 不是抽象基类，而 D 是\nclass C: pass\nclass D(metaclass=ABCMeta): @abstractmethod def foo(self): pass\nprint(C.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n0\n\"\"\"\nprint(D.__flags__ & Py_TPFLAGS_IS_ABSTRACT)\n\"\"\"\n1048576\n\"\"\" 所以这就是 tp_flags 的作用，它负责描述一个类型对象都具有哪些额外特征。 tp_doc 对应 Python 中类型对象的 __doc__。 class People: \"\"\"以前我没得选\"\"\" print(People.__doc__)\n\"\"\"\n以前我没得选\n\"\"\" 这个比较简单。 tp_traverse，tp_clear 这两个字段是一对，负责参与垃圾回收机制。 tp_traverse：用于标记阶段，通过遍历实例对象所引用的其它对象，确定对象之间的引用关系，帮助垃圾回收器识别出所有活跃的对象和出现循环引用的对象。 tp_clear：用于清除阶段，负责减少出现循环引用的对象的引用计数。 tp_richcompare 负责实现对象的比较逻辑，包含 >、>=、<、<=、!=、==。 tp_weaklistoffset 实例对象的弱引用列表在实例对象中的偏移量，如果 tp_weaklistoffset 为 0，则表示实例对象不支持弱引用。 tp_iter、tp_iternext 对应 Python 中类型对象的 __iter__ 和 __next__。 tp_methods 负责保存类型对象里的成员函数，我们以 list 为例。 tp_members 负责指定可以绑定在实例对象上的属性，我们使用 class 关键字定义动态类的时候，会在 __init__ 函数中给实例对象绑定属性，而对于底层 C 来说，需要通过 tp_members 字段。 以 slice 为例，它负责创建一个切片。 lst = list(range(10))\nprint(lst[1: 7: 2]) # [1, 3, 5]\n# 等价于\nprint(lst[slice(1, 7, 2)]) # [1, 3, 5] slice 是一个底层实现好的静态类，接收 start、end、step 三个参数，所以它底层的 tp_members 就是这么定义的。 对于静态类而言，可以给 self 绑定哪些属性、以及类型是什么，都已经事先在 tp_members 里面写死了，后续不可以新增或删除属性。 s = slice(1, 7, 2)\n# 静态类的实例对象不可以新增或删除属性\ntry: s.xx = \"xx\"\nexcept AttributeError as e: print(e) \"\"\" 'slice' object has no attribute 'xx' \"\"\" # 至于能否修改，则看定义属性时是否要求属性是 READONLY\n# 对于 slice 来说，它的三个属性都是 READONLY，所以不能修改\ntry: s.start = 2\nexcept AttributeError as e: print(e) \"\"\" readonly attribute \"\"\" 但使用 class 自定义的动态类而言，新增、删除、修改属性都是可以的，至于里面的更多细节，后续在介绍类的时候会详细剖析。 tp_getset 指向一个 PyGetSetDef 结构体数组，里面的每个结构体都定义了一个属性的名称、获取该属性的函数、设置该属性的函数、属性的文档字符串。 name：属性的名称，Python 代码可以通过该名称来访问属性。 get：属性的 getter 函数，如果设置了这个函数，Python 代码读取属性时会调用它。 set：属性的 setter 函数，如果设置了这个函数，Python 代码修改属性时会调用它。 doc：属性的文档字符串，为属性提供描述信息。 closure：一个 void * 指针，用于传递额外的信息给 getter 和 setter，不常用。 所以我们发现 tp_getset 的作用不就类似于 @property 装饰器吗？tp_getset 数组里面的每个结构体负责实现一个 property 属性。 tp_base 对应 Python 中类型对象的 __base__，返回继承的第一个父类。 tp_dict 对应 Python 中类型对象的 __dict__，即属性字典。 tp_descr_get、tp_descr_set 对应 Python 中类型对象的 __get__ 和 __set__，用于实现描述符。 tp_dictoffset 注意它和 tp_dict 的区别，tp_dict 表示类型对象的属性字典，而 tp_dictoffset 表示实例对象的属性字典在实例对象中的偏移量。 tp_init 对应 Python 中类型对象的 __init__，用于实例对象属性的初始化。 tp_alloc 负责为实例对象申请内存，申请多大呢？取决于 tb_basicsize 和 tp_itemsize。 tp_new 对应 Python 中类型对象的 __new__，即构造函数，在 tp_new 内部会调用 tp_alloc 为实例对象申请内存。 tp_free 内存释放函数，负责释放实例对象所占的内存，注意它和 tp_dealloc 的区别与联系。tp_dealloc 表示析构函数，当对象的引用计数降到零的时候执行，内部会负责如下工作。 减少引用的其它对象的引用计数； 释放对象拥有的资源，比如文件句柄或网络连接； 调用内存释放函数来释放对象本身占用的内存，这一步由 tp_free 来完成。 所以要注意这几个字段之间的区别，我们再总结一下。 tp_is_gc 指示该类型对象的实例对象是否参与垃圾回收。 // Objects/typeobject.c\nunsigned long\nPyType_GetFlags(PyTypeObject *type)\n{ return type->tp_flags;\n} // Include/object.h\n#define PyType_HasFeature(t,f) ((PyType_GetFlags(t) & (f)) != 0) // Include/objimpl.h\n// 显然只需判断 tp_flags & Py_TPFLAGS_HAVE_GC 是否不等于 0 即可\n#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC) 如果参与垃圾回收，那么 tp_flags & Py_TPFLAGS_HAVE_GC 的结果不等于 0。 tp_bases 对应 Python 中类型对象的 __bases__，返回一个元组，里面包含直接继承的所有父类。 tp_mro 对应 Python 中类型对象的 __mro__，返回一个元组，里面包含自身以及直接继承和间接继承的所有父类，直到 object。 注意：返回的元组中的类是有顺序关系的，它基于 C3 线性算法生成，定义了方法解析的顺序。当 Python 需要查找方法或属性时，将按照此顺序进行搜索。 tp_cache 该字段已废弃，这里不做介绍。 tp_subclasses 等价于 Python 中类型对象的 __subclasses__，会返回继承该类的所有子类。 class A: pass class B(A): pass class C(B): pass print(A.__subclasses__())\n\"\"\"\n[<class '__main__.B'>]\n\"\"\" 但是只返回直接继承的子类，间接继承的不返回，比如这里只返回了 B，而 C 没有返回。 tp_weaklist 类型对象的弱引用列表，注意它和前面提到的 tp_weaklistoffset 的区别。tp_weaklist 表示类型对象的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表在实例对象中的偏移量。 tp_del 和 tp_dealloc 作用相同，但 tp_del 主要是兼容以前的旧版本，现在直接使用 tp_dealloc 即可。 tp_version_tag 用于标记类型对象的版本，每当类型的定义发生变化时（例如添加、删除或修改成员函数），版本标签就会更新。解释器会使用这个版本标签来确定方法缓存是否有效，从而避免每次调用方法时都重新解析和查找。 tp_finalize 负责在对象被销毁之前执行相应的清理操作，确保资源得到妥善处理，它的调用时机在对象的引用计数达到零之后、tp_dealloc（析构函数）被调用之前。 该字段不常用，一般只出现在生成器和协程当中。然后 tp_dealloc、tp_del、tp_finalize 三个字段的类型是一致的，都是 destructor 类型，那么它们三者有什么区别呢？ tp_dealloc：在所有的类型对象中都需要指定，因为它是管理实例对象生命周期的关键，它负责减少引用的其它对象的引用计数，以及调用 tp_free 释放当前对象占用的内存，当然也可以执行必要的清理操作。 tp_finalize：负责在对象的生命周期结束前执行相关清理操作，一般只用于生成器和协程当中，此时会和 tp_dealloc 搭配使用。 tp_del：除非是兼容遗留代码，否则应避免使用 tp_del，而是依赖于更现代的垃圾回收和清理机制，即使用 tp_dealloc。 tp_vectorcall 前面说了，实例对象在调用时，可以走类型对象的 tp_call，但这样效率不高。为此 Python 引入了矢量调用，实现矢量调用的函数指针定义在实例对象内部，偏移量则由类型对象的 tp_vectorcall_offset 字段维护。 如果实例对象支持矢量调用，那么会通过类型对象的 tp_vectorcall_offset 定位到对应的 vectorcall 函数指针，进行调用。否则执行类型对象的 tp_call。 那么问题来了，既然实例对象可以支持矢量调用，那么类型对象当然也可以支持。而类型对象的矢量调用函数，便由 tp_vectorcall 字段指定。 所以 tp_vectorcall 和 tp_vectorcall_offset 之间的关系，就类似于 tp_dict 和 tp_dictoffset 之间的关系。 tp_dict 表示类型对象自身的属性字典，tp_dictoffset 表示实例对象的属性字典相对于实例对象首地址的偏移量。 tp_vectorcall 表示类型对象自身的矢量调用函数，tp_vectorcall_offset 表示实例对象的矢量调用函数相对于实例对象首地址的偏移量。 tp_weaklist 表示类型对象自身的弱引用列表，tp_weaklistoffset 表示实例对象的弱引用列表相对于实例对象首地址的偏移量。 offset 机制允许实例对象拥有更加弹性的内存布局。 另外如果类型对象的 tp_vectorcall 字段为空，则表示类型对象不支持矢量调用，那么它在调用时会走元类的 tp_call。所以我们说 class 具有二象性，而这种平行的设计使得 Python 能够统一处理类型对象和实例对象的属性访问和调用行为。 以上就是 PyTypeObject 的各个字段的含义。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 解密 PyTypeObject","id":"18","title":"解密 PyTypeObject"},"180":{"body":"当存储键值对时，要将 key 映射成索引，这个索引就是哈希索引数组的索引。至于具体的映射过程由探测函数负责，即 PyDictKeysObject 结构体内部的 dk_lookup 字段。 Python 为哈希表搜索提供了多种探测函数： lookdict_unicode：专门针对 key 为字符串的 entry。 lookdict_index：专门针对 key 为整数的 entry。 lookdict：通用逻辑，可以把 lookdict_unicode、lookdict_index 看成 lookdict 的特殊实现，只不过 key 是整数和字符串的场景非常常见，因此为其单独实现了一个函数。 我们这里重点看一下 lookdict 的函数实现，不过在介绍之前，先来看几个宏。 // Objects/dictobject.c // 获取哈希表的长度，或者说哈希索引数组的长度\n#define DK_SIZE(dk) ((dk)->dk_size) // 哈希表的长度减 1，将 key 的哈希值和它按位与，便可将 key 映射成索引\n// 因为 dk_size 满足 2 的 n 次方，所以 hash % dk_size 等价于 hash & (dk_size - 1)\n#define DK_MASK(dk) (((dk)->dk_size)-1) // 获取哈希索引数组中每个元素的大小，数组的长度不同，每个元素的大小不同\n// dk_size <= 255，每个元素 1 字节\n// 256 <= dk_size <= 65535，每个元素 2 字节\n// 65536 <= dk_size <= 4294967295，每个元素 4 字节\n// dk_size >= 4294967296，每个元素 8 字节\n// 由于字典的键值对个数基本不会超过 4294967295，所以我们认为元素的大小就是 1、2 或者 4 字节\n#define DK_IXSIZE(dk) \\ (DK_SIZE(dk) <= 0xff ? \\ 1 : DK_SIZE(dk) <= 0xffff ? \\ 2 : DK_SIZE(dk) <= 0xffffffff ? \\ 4 : sizeof(int64_t)) // 获取紧跟在 PyDictKeysObject 结构体后面的键值对数组\n// 这个和前面介绍字符串时，获取 PyASCIIObject 结构体后面的字符数组是类似的\n// 主要是利用 C 语言指针的技巧（甚至都不能算技巧），这里再来详细介绍一下\n// 假设有一个 int *a，那么 a + 3 和 a[3] 是等价的，都会向后偏移 3 个 int，即 12 字节\n// 那么问题来了，对于任意类型的指针 T *p，如果想向后偏移 n 个字节，该怎么做呢？\n// 很简单，将 p 加上 n / sizeof(T) 即可，但问题是 n / sizeof(T) 不一定是个整数啊\n// 因此我们可以将指针转成 int8_t *，然后再加上 n，这样就会偏移 sizeof(int8_t) * n 个字节，即 n 个字节\n// 比如 ((int8_t *)p) + n 或者 ((int8_t *)p)[n]\n// 然后再来看 DK_ENTRIES 这个宏的逻辑，由于键值对数组紧跟在哈希索引数组后面\n// 所以通过 (dk)->dk_indices 获取哈希索引数组，然后转成 int8_t * 类型\n// 而 DK_SIZE(dk) * DK_IXSIZE(dk) 显然是哈希索引数组所占的内存大小\n// 然后让 (int8_t*)((dk)->dk_indices) 向后偏移这些字节，不就定位到键值对数组的首元素了吗\n#define DK_ENTRIES(dk) \\ ((PyDictKeyEntry*)(&((int8_t*)((dk)->dk_indices))[DK_SIZE(dk) * DK_IXSIZE(dk)])) // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 以上就是常用的几个宏，然后来看探测函数 lookdict 的逻辑。 // Objects/dictobject.c #define PERTURB_SHIFT 5 // 基于哈希索引数组的索引，获取指定的哈希槽里面存储的键值对数组的索引\nstatic inline Py_ssize_t\ndictkeys_get_index(PyDictKeysObject *keys, Py_ssize_t i)\n{ // 哈希表的长度 Py_ssize_t s = DK_SIZE(keys); // 键值对数组的索引 Py_ssize_t ix; // 如果哈希表的长度小于 1 << 8，哈希索引数组的每个元素占 1 字节 if (s <= 0xff) { int8_t *indices = (int8_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度小于 1 << 16，哈希索引数组的每个元素占 2 字节 // 指针类型要转成 int16_t *，这样获取元素时会获取两个字节 else if (s <= 0xffff) { int16_t *indices = (int16_t*)(keys->dk_indices); ix = indices[i]; } // 如果哈希表的长度大于等于 1 << 32，哈希索引数组的每个元素占 8 字节（no way）\n#if SIZEOF_VOID_P > 4 else if (s > 0xffffffff) { int64_t *indices = (int64_t*)(keys->dk_indices); ix = indices[i]; }\n#endif // 否则哈希索引数组的每个元素占 4 字节 else { int32_t *indices = (int32_t*)(keys->dk_indices); ix = indices[i]; } assert(ix >= DKIX_DUMMY); // 返回键值对数组的索引 return ix;\n} // 探测函数\nstatic Py_ssize_t _Py_HOT_FUNCTION\nlookdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr)\n{ // 将 key 映射成索引，这个索引就是哈希索引数组的索引 /* 参数 mp：指向字典的指针 * 参数 key：指向键的指针 * 参数 hash：键的哈希值 * 参数 value_addr：值的二级指针 */ size_t i, mask, perturb; PyDictKeysObject *dk; PyDictKeyEntry *ep0; top: // 指向 PyDictKeysObject 对象 dk = mp->ma_keys; // 获取 PyDictKeysObject 内部的 dk_entries，即键值对数组 ep0 = DK_ENTRIES(dk); // 哈希表的长度减 1 mask = DK_MASK(dk); // perturb，初始值等于参数 hash，即 key 的哈希值 perturb = hash; // 将哈希值和 mask 按位与，计算出哈希索引数组的索引 i = (size_t)hash & mask; for (;;) { // 基于哈希索引数组的索引，从指定的哈希槽中获取键值对数组的索引 Py_ssize_t ix = dictkeys_get_index(dk, i); // 哈希索引数组里面的元素初始为 -1，如果 ix == -1 // 证明当前 key 映射出的哈希槽，还没有存储键值对数组的某个索引 // 这就意味着当前要查找的 key 不存在，此时直接返回 -1 即可 if (ix == DKIX_EMPTY) { *value_addr = NULL; return ix; } // 如果 ix >= 0，说明确实存储了一个合法的键值对数组的索引 if (ix >= 0) { // ep0 是键值对数组，基于索引 ix 获取里面的键值对 PyDictKeyEntry *ep = &ep0[ix]; assert(ep->me_key != NULL); // ep->me_key 和变量 key 都是指针 // 如果这两者相等，说明指向了同一个对象（字符串），显然查找的 key 已在字典中 if (ep->me_key == key) { // 该函数不光要返回索引，还要返回 value，但 C 是单返回值语言，怎么办呢？ // 只需要在调用函数时传个指针过来即可，会在函数内部进行修改 // 由于 Python 的变量、容器存储的元素本身就是指针，所以 value_addr 是个二级指针 *value_addr = ep->me_value; // 返回键值对数组的索引 return ix; } // 如果 ep->me_key != key，说明两者指向的不是同一个对象 // 那么就比较两个对象本身以及哈希值是否相等，如果相等，也表示 key 已存在 if (ep->me_hash == hash) { // 先保证哈希值相等 PyObject *startkey = ep->me_key; Py_INCREF(startkey); // cmp 大于 0 说明比较结果为真，等于 0 说明比较结果为假，小于 0 说明比较时出现错误 int cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) { *value_addr = NULL; return DKIX_ERROR; } // 可能有人觉得这里的 if 是不是有点多余，这肯定百分百成立啊 // 其实这一步主要是为了检测字典是否被修改（不用关注） if (dk == mp->ma_keys && ep->me_key == startkey) { // 如果 cmp > 0，说明两个对象相等，那么修改 *value_addr，返回 ix if (cmp > 0) { *value_addr = ep->me_value; return ix; } } else { // 字典如果被修改，那么重头来，这里不用关注 goto top; } } } // 走到这里说明 ix 是合法的，但是对应的 entry->me_key 和当前要查找的 key 不相等 // 显然出现了索引冲突，于是将哈希值右移 5 位 perturb >>= PERTURB_SHIFT; // 然后加上 i*5 + 1，并重新和 mask 按位与，得到新的哈希索引数组的索引 // 也就是之前说的，改变规则、重新映射 i = (i*5 + perturb + 1) & mask; } Py_UNREACHABLE();\n} 以上就是 lookdict 函数的逻辑，至于 lookdict_index 和 lookdict_unicode 与之是类似的。 我们将逻辑再描述一遍，首先 perturb 初始等于 key 的哈希值，mask 等于哈希表的长度减一，然后执行 perturb & mask 便可得到一个索引。这个过程就是我们说的索引映射，映射出的索引便是哈希索引数组的索引，然后该索引对应的哈希槽又存储了一个索引，这个索引是键值对数组的索引。 哈希索引数组里面的一个位置我们称之为一个槽，如果映射出来的索引对应的哈希槽中存储的键值对数组的索引小于 0，说明该 key 对应的键值对还没有被存储过，那么直接返回初始值 -1 即可。 如果存储的键值对数组的索引（源码中的 ix）大于等于 0，说明已经存储了一个键值对，它的 key 和查找的 key 映射出的索引是相同的。然后比较 key 是否相等，如果相等，说明已经找到了，那么直接返回 ix 即可。如果 key 不相等，说明出现索引冲突了，那么要改变策略，重新映射。 perturb >>= PERTURB_SHIFT;\ni = mask & (i*5 + perturb + 1); 变量 i 便是映射出的哈希索引数组的索引，但发生冲突了，于是将 perturb 右移 5 位，然后加上 perturb + i * 5 + 1，再和 mask 按位与计算出新的 i。至于为什么要选择这种做法，这是 Python 官方经过多次实践得出来的结论。 当 lookdict 执行完之后，外界就拿到了指定的 key 对应的键值对数组的索引，并且也能拿到 key 对应的 value（key 若不存在就是 NULL）。但是还没结束，我们看到 lookdict 返回的是变量 ix，而变量 i 才是我们需要的。 变量 i 表示槽的索引，变量 ix 表示该槽存储的键值对数组的索引。由于我们是要寻找指定的槽，那么返回的应该是槽的位置、也就是变量 i 才对啊，为啥要返回变量 ix 呢？别急，往下看。 #define DKIX_EMPTY (-1) 初始状态下，槽存储的都是 -1，表示当前槽是可用的。如果存储的索引大于等于 0，则表示该槽已经被占用了，当 key 不相等时会改变规则重新映射。总之最终的结果是： 如果 key 存在，那么返回的 ix 就是该 key 对应的键值对在键值对数组中的索引，此时 ix 大于等于 0； 如果 key 不存在，那么返回的 ix 就是哈希槽的初始值 -1。 所以 lookdict 函数只是告诉我们当前 key 在哈希表中是否存在，如果要获取槽的索引，即 lookdict 里面的变量 i，那么还需要另外两个函数。 find_empty_slot：如果 lookdict 返回的 ix 小于 0，说明 key 不存在，那么调用该函数返回槽的索引。 lookdict_index：如果 lookdict 返回的 ix 大于等于 0，说明 key 存在，那么调用该函数返回槽的索引。 所以这两个函数做的事情是一样的，都是返回槽的索引，我们看一下具体实现。 // Objects/dictobject.c static Py_ssize_t\nfind_empty_slot(PyDictKeysObject *keys, Py_hash_t hash)\n{ assert(keys != NULL); const size_t mask = DK_MASK(keys); // 获取槽的索引 i size_t i = hash & mask; // 获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(keys, i); // 不停映射，直到 ix 小于 0 // 因为调用该函数时已经说明 key 不存在了 // 所以最终一定会映射到一个空槽 for (size_t perturb = hash; ix >= 0;) { perturb >>= PERTURB_SHIFT; // 映射的逻辑是相同的 i = (i*5 + perturb + 1) & mask; ix = dictkeys_get_index(keys, i); } // 当 ix 小于 0 时，便找到了槽的索引 return i;\n} static Py_ssize_t\nlookdict_index(PyDictKeysObject *k, Py_hash_t hash, Py_ssize_t index)\n{ size_t mask = DK_MASK(k); size_t perturb = (size_t)hash; size_t i = (size_t)hash & mask; for (;;) { // 基于槽的索引 i，获取槽存储的索引 ix Py_ssize_t ix = dictkeys_get_index(k, i); // 参数 index 就是 lookdict 函数返回的 ix // 如果 ix 和 index 是相等的，说明此时的 i 就是要获取的槽的索引 if (ix == index) { return i; } if (ix == DKIX_EMPTY) { return DKIX_EMPTY; } // 整个映射逻辑都是一样的 // 因为在 lookdict 函数中只返回了 ix，即参数 index // 所以要按照相同的规则再映射一次，如果映射出的 ix 和 index 相等 // 那么我们就找到了槽的索引 i，并且索引为 i 的槽存储的就是 index perturb >>= PERTURB_SHIFT; i = mask & (i*5 + perturb + 1); } Py_UNREACHABLE();\n} 所以我们说的探测函数应该是 lookdict 和 find_empty_slot、lookdict_index 的组合。 lookdict 负责返回槽存储的索引，用于判断 key 是否存在。 find_empty_slot、lookdict_index 则负责返回槽的索引，即 key 最终被映射到了哪一个槽。 另外还有一点，我们之前说索引冲突时，会执行探测函数计算新的存储位置。其实不管有没有发生冲突，即使存储键值对的时候哈希表是空的，也要执行探测函数，毕竟探测函数的目的就是基于哈希值映射出一个合适的槽。如果探测函数执行的时候发现索引冲突了，也就是槽里的索引 ix >= 0，并且 key 还不相等，那么会改变规则重新映射。 因此在存储某个键值对时，无论索引冲突多少次，探测函数只会执行一次。在探测函数里面，会不断尝试解决冲突，直到映射出一个可用的槽。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 探测函数","id":"180","title":"探测函数"},"181":{"body":"以上就是索引映射的具体逻辑，以及出现冲突是怎么解决的。就是先用哈希函数计算出 key 的哈希值，然后作为参数传递到探测函数中。在探测函数里面，会将哈希值和 mask 按位与，得到索引。如果索引冲突了，那么会改变规则，这里的规则如下： // 将哈希值右移 PERTURB_SHIFT 个位\nperturb >>= PERTURB_SHIFT;\n// 然后将哈希值加上 i*5 + 1，这个 i 就是当前冲突的索引\n// 运算之后的结果再和 mask 按位与，得到一个新的 i\n// 然后判断变量 i 对应的槽是否可用，不可用则重复当前逻辑，直到出现一个可用的槽\ni = (i*5 + perturb + 1) & mask; 所以 Python 在索引冲突时，并不像线性探测和平方探测那样，简单地加一个固定的偏移量，而是参考对象的哈希值计算出一个新的索引。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"42. 字典的 key 是怎么映射成索引的，索引冲突了又该怎么办？ » 小结","id":"181","title":"小结"},"182":{"body":"通过前面的学习，我们知道哈希表这种数据结构的逻辑是先通过哈希函数计算出键（key）的哈希值，然后将哈希值传递到探测函数中，映射成一个索引，最终通过索引去访问连续的内存区域。而哈希表这种数据结构，最终目的就是加速键的搜索过程。 但索引会存在冲突，并且键值对数量越多，映射出的索引出现冲突的概率越高。而如果冲突了，就改变规则重新映射，这种做法叫做开放寻址法。当发生冲突时，在探测函数内部会参考哈希值以及冲突的索引，计算下一个候选位置，并判断是否可用。如果不可用，会继续重复此过程，直到找到一个可用的位置。 通过多次探测，会经过多个位置，我们认为这些位置就形成了一个冲突探测链（探测序列），下面举例说明。 为了描述方便，我们后续偶尔会用 dk_indices 表示哈希索引数组、用 dk_entries 表示键值对数组、用 entry 表示键值对（包含两个字段：me_key 和 me_value，分别表示键和值）。当然在源码中，它们也是这个名字。 key 映射之后的索引是哈希索引数组的索引，我们记作 i，该索引对应的哈希槽中又存储了一个索引（entry 在键值对数组中的索引），我们记作 ix。那么 ix = dk_indices[i]，对应的 entry = dk_entries[ix]。 比如插入一个 key 等于 \"satori\" 的键值对，它映射到了索引为 a 的槽，但是该槽已经被占用了，那么 dk_entries[dk_indices[a]] 便是使用该槽的 entry，但它的 key 不等于 \"satori\"，说明出现了索引冲突。于是重新映射，映射到索引为 b 的槽，发现依旧不行。那么只能再次映射，映射到索引为 c 的槽，发现该槽存储的索引是 -1，说明该槽还没有人用，于是将键值对追加到 dk_entries 中，并把它在 dk_entries 中的索引存在该槽中。 那么经过以上流程，a -> b -> c 便形成了一条冲突探测链，同理我们查找的时候也会按照这个顺序进行查找。 显然上面这些东西，现在理解起来已经没什么难度了，我们基于 key 获取 value 时也是这个过程。 当执行 d[\"satori\"] 时，肯定会先映射到索引为 a 的槽，但 dk_entries[dk_indices[a]].me_key 不等于字符串 \"satori\"，于是重新映射。然后映射到索引为 b 的槽，发现还不相等，再映射到索引为 c 的槽，发现对应的键值对的 key 等于 \"satori\"，于是就把值取出来了。 显然以上符合我们的预期，但是，我要说但是了。如果我们把索引为 b 的槽对应的 entry 删掉呢？那么老规矩，映射成索引，先走到索引为 a 的槽，但是发现坑被占，于是又走到索引为 b 的槽，结果发现居然没有 entry，那么直接就报出了一个 KeyError。 所以继续寻找的前提是，哈希槽一定存储了某个 entry 在键值对数组中的索引，并且该 entry 的 key 和指定的 key 不相等。但如果发现没有 entry，直接 KeyError。 然而 \"satori\" 这个 key 确实是存在的，因此这种情况我们称之为探测链断裂。本来应该走到位置 c 的，但是由于位置 b 没有对应 entry，导致探测函数在位置 b 就停止了。 因此我们发现，当一个 entry 只要位于任何一条探测链当中，在删除时都不能执行真正意义上的删除，而是要进行伪删除。那什么是伪删除呢？别着急，先往下看。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表能直接删除元素吗","id":"182","title":"哈希表能直接删除元素吗"},"183":{"body":"哈希槽有以下几种状态： Unused； Active； Dummy； 来解释一下它们的含义。 // Objects/dict-common.h\n#define DKIX_EMPTY (-1)\n#define DKIX_DUMMY (-2) /* Used internally */\n#define DKIX_ERROR (-3) 上面几个宏非常重要，当然主要是前两个宏。 Unused 态 如果没有 key 映射到指定的哈希槽，那么该哈希槽存储的索引就是 -1，即 DKIX_EMPTY，表示该槽尚未被使用，那么状态便是 Unused 态。比如一个刚初始化的哈希表，它的哈希索引数组存储的便都是 -1。 Active 态 如果某个 key 映射到了指定的哈希槽，那么该槽便会存储对应 entry 在键值对数组中的索引，这个索引一定是大于等于 0 的，此时该槽就从 Unused 态变成了 Active 态。 后续如果又有 key 映射到了该槽，那么看它和已存在的 entry 的 key，即 entry->me_key 是否相等。如果不相等，那么要改变规则重新映射；如果相等，那么便找到了指定的 entry，此时便可以更新或返回 entry->me_value。 Dummy 态 假设 key=\"abc\" 映射到了索引为 i 的哈希槽，该槽存储了对应的 entry 在键值对数组中的索引 ix，这时如果将 key=\"abc\" 的键值对给删掉，那么索引为 i 的哈希槽存储的值会变成多少呢？ 可能有人觉得，键值对都删掉了，那么哈希槽也不用再存储它的索引了，应该会重置为 -1 吧。答案是不对的，原因就是我们刚才说的，这么做会导致探测链断裂。 当 entry 被删掉之后，哈希槽存储的值会变成 -2，即 DKIX_DUMMY，表示该槽之前存储过某个 entry 在键值对数组中的索引，但是该 entry 被删除了。注：删除 entry 也不是直接将它从键值对数组中删掉，而是将它的 me_key 和 me_value 字段设置为 NULL。 图中的 dk_indices 中有一个槽存储的是 -2，但很明显之前它存储的应该是 1，只是后续 dk_entries 中索引为 1 的 entry 被删除了。而删除一个 entry，会将它的 me_key 和 me_value 设置为 NULL，并将哈希槽存储的索引设置为 -2，这便是上面提到的伪删除技术。 所以一个哈希槽有三种状态，我们记哈希槽存储的索引为 ix。 1）如果 ix == -1，说明该槽处于 Unused 态，还没有存储任何一个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，那么会 KeyError。 2）如果 ix >= 0，说明该槽处于 Active 态，已经保存了某个 entry 在键值对数组中的索引。 当添加一个 entry 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要添加的 entry 的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么直接更新 value。 当基于 key 获取 value 并且 key 映射到了该槽，那么看已存在的 entry 的 key 和要搜索的 key 是否相等。如果不相等，索引冲突，要重新映射。如果相等，那么返回 entry 的 value。 3）如果 ix == -2，说明该槽处于 Dummy 态，之前存储了某个 entry 在键值对数组中的索引，但之后该 entry 被删除了。 当添加一个 entry 并且 key 映射到了该槽，那么直接将 entry 追加到键值对数组，并让该槽保存它在键值对数组中的索引。 当基于 key 获取 value 并且 key 映射到了该槽，发现处于 Dummy 态，会明白虽然当前的槽是无效的，但它不是探测链的终点，所以不会报错，而是会继续搜索，这样就保证了探测链的连续性。至于报错，是发现映射出的哈希槽处于 Unused 态，没有存储任何一个 entry 的索引，这就说明 key 对应的 entry 不存在，此时才会 KeyError。 以上就是哈希槽的三种状态，它们之间可以进行转换，但 Unused 态只能转换为 Active 态；Active 态只能转换为 Dummy 态；Dummy 态只能转换为 Active 态。 如果哈希槽存储的 ix == DKIX_EMPTY，那么它处于 Unused 态。如果后续存储了 entry 在键值对数组中的索引，那么 ix >= 0，此时哈希槽会从 Unused 态转换为 Active 态。如果哈希槽存储的索引对应的 entry 被删除，那么 ix 会变成 DKIX_DUMMY，此时哈希槽会从 Active 态转换为 Dummy 态。 那么问题来了，Dummy 态转换为 Active 态，你能猜到会在什么时候发生吗？ 很容易想到，假设新来了一个 entry，它正好撞上了 Dummy 态的哈希槽，那么该槽会从 Dummy 态转为 Active 态。 总结：假设新增一个 entry，它的 key 映射到了索引为 i 的槽，该槽存储的索引为 ix。 如果 ix == -1，说明一上来就有位置可用，那么直接将 entry 追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。也就是说，Python 默认不关心是否有 Dummy 态的哈希槽。 如果 ix >= 0，说明该槽已经有人用了，那么比较 dk_entries[ix].me_key 和要插入的 entry 的 key 是否相等，如果相等，那么更新键值对，不相等则重新映射。 如果 ix == -2，说明该槽之前被使用了，但使用它的 entry 后续又被删除了（伪删除，内存还在）。此时会复用该哈希槽，不过被伪删除的旧 entry 不会被复用，新增的 entry 依旧会追加到 dk_entries 中，并把它在 dk_entries 中的索引赋值给 dk_indices[i]。 还是这张图，但做了一些修改。图中索引为 5 的哈希槽存储的索引 ix 等于 4，但它经历了以下几个过程。 dk_indices[5] 初始为 -1，即 DKIX_EMPTY，此时处于 Unused 态。 来了一个 entry，映射到了索引为 5 的槽，发现该槽可用，于是将 dk_indices[5] 修改为 1（它在 dk_entries 中的索引），此时哈希槽变成 Active 态。 映射到索引为 5 的哈希槽的 entry 被删除，于是将 dk_indices[5] 修改为 DKIX_DUMMY，即 -2，并将 dk_entries[1] 的 me_key 和 me_value 设置为 NULL，此时哈希槽变成 Dummy 态。 后续又来了一个 entry，也映射到了索引为 5 的哈希槽，发现 dk_indices[5] 等于 -2，处于 Dummy 态。于是将新的 entry 追加到 dk_entries 中，并且在 dk_entries 中的索引为 4，然后再将 dk_indices[5] 修改为 4，此时哈希槽再次变成 Active 态。 那么问题来了，被删除的旧 entry 怎么办？显然会留在那里，它是无法被复用的，当它被删除的那一刻，就和哈希索引数组失去了联系，因为对应的哈希槽存储的值被修改成了 -2。即使后续有新的 entry 映射到了同一个槽，它也不知道该槽在存储 -2 之前存储了什么，所以只能选择追加。 而那些被删除的旧 entry 会在哈希表执行扩缩容的时候被处理，比如哈希表满了，会申请新的存储单元，然后将处于 Active 态的哈希槽对应的 entry 搬过去，其它的则直接丢弃。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希槽的几种状态","id":"183","title":"哈希槽的几种状态"},"184":{"body":"下面我们通过源码，来感受一下字典（哈希表）是如何删除元素的。字典有一个 pop 方法，可以基于 key 弹出指定的 entry，我们就来看一下它的源码实现。 // Objects/dictobject.c\n#define DICT_POP_METHODDEF \\ {\"pop\", (PyCFunction)(void(*)(void))dict_pop, METH_FASTCALL, dict_pop__doc__}, static PyObject *\ndict_pop(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // pop 方法的返回值 PyObject *return_value = NULL; // 指定的 key PyObject *key; // pop 方法支持传入一个默认值 // 当 key 不存在时，如果不指定默认值，pop 方法会报错，否则会返回默认值 PyObject *default_value = NULL; // args 是由参数组成的元组，nargs 表示参数的个数 // 显然参数的个数必须是 1 ~ 2 个 if (!_PyArg_CheckPositional(\"pop\", nargs, 1, 2)) { goto exit; } // args[0] 表示 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 表示默认值，如果指定了的话 default_value = args[1];\nskip_optional: // 调用 dict_pop_impl 函数 // 从字典中弹出具有指定 key 的 entry，并返回它的 value return_value = _PyDict_Pop((PyObject*)self, key, default_value); exit: return return_value;\n} 具体的逻辑由 _PyDict_Pop 承载，看看它长什么样子？ // Objects/dictobject.c\nPyObject *\n_PyDict_Pop(PyObject *dict, PyObject *key, PyObject *deflt)\n{ Py_hash_t hash; // 快分支，如果键值对的个数为 0 if (((PyDictObject *)dict)->ma_used == 0) { // 那么当指定默认值时，直接返回默认值 if (deflt) { Py_INCREF(deflt); return deflt; } // 否则抛出 KeyError _PyErr_SetKeyError(key); return NULL; } // 计算 key 的哈希值，这里分两种情况 // key 不是字符串，那么调用 PyObject_Hash 函数进行计算 // key 是字符串，那么直接获取，如果获取的结果为 -1（之前没有计算过），也要重新计算 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { // 如果计算的结果是 -1，说明 key 无法被哈希 hash = PyObject_Hash(key); if (hash == -1) return NULL; } return _PyDict_Pop_KnownHash(dict, key, hash, deflt);\n} PyObject *\n_PyDict_Pop_KnownHash(PyObject *dict, PyObject *key, Py_hash_t hash, PyObject *deflt)\n{ Py_ssize_t ix, hashpos; PyObject *old_value, *old_key; PyDictKeyEntry *ep; PyDictObject *mp; assert(PyDict_Check(dict)); mp = (PyDictObject *)dict; // 如果字典为空，即键值对个数为 0 // 那么当指定默认值时，直接返回默认值，否则抛出 KeyError if (mp->ma_used == 0) { if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // mp->ma_keys->dk_lookup 表示探测函数，负责将 key 映射成索引，找到对应的哈希槽 // 然后返回哈希槽存储的 entry 在 dk_entries 中的索引 // 并且在探测函数里面，还会对 old_value 进行修改 ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); if (ix == DKIX_ERROR) return NULL; // 如果 ix == -1，说明映射之后的哈希槽处于 Unused 态 // 说明该 key 对应的 entry 不存在，或者说 key 不存在 if (ix == DKIX_EMPTY || old_value == NULL) { // 如果指定了默认值，返回默认值，否则抛出 KeyError if (deflt) { Py_INCREF(deflt); return deflt; } _PyErr_SetKeyError(key); return NULL; } // 到这里说明 ix >= 0，即 key 在字典中存在 // 然后检测字典是否是分离表，由于分离表不允许删除 key，所以要重构为结合表 // 分离表就是为了节省内存引入的，因此它的限制较多，这里不做过多讨论 if (_PyDict_HasSplitTable(mp)) { if (dictresize(mp, DK_SIZE(mp->ma_keys))) { return NULL; } ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &old_value); assert(ix >= 0); } // 这个函数之前也见过，它负责基于哈希槽存储的 entry 的索引，返回哈希槽的索引 hashpos = lookdict_index(mp->ma_keys, hash, ix); assert(hashpos >= 0); assert(old_value != NULL); // 字典的长度减 1 mp->ma_used--; // 更新字典的版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 将索引为 hashpos 的哈希槽的值设置为 DKIX_DUMMY // 即 dk_indices[hashpos] = DKIX_DUMMY // 注意：不能设置为 DKIX_EMPTY，因为要保护冲突探测链不断裂 dictkeys_set_index(mp->ma_keys, hashpos, DKIX_DUMMY); // 获取指定的 entry，即 dk_entries[ix] ep = &DK_ENTRIES(mp->ma_keys)[ix]; ENSURE_ALLOWS_DELETIONS(mp); // 将 me_key 和 me_value 设置为 NULL，伪删除 // 并减少它们指向的对象的引用计数 old_key = ep->me_key; ep->me_key = NULL; ep->me_value = NULL; Py_DECREF(old_key); ASSERT_CONSISTENT(mp); // 返回弹出的 value return old_value;\n} 整个过程和我们之前的分析一样，这里为了更好地理解，我们再举个实际的例子，将整个流程给串一下。 字典存储了三个键值对，显然它们会按照先来后到的顺序存储在 dk_entries 中。然后 \"a\": 1 映射到了索引为 4 的哈希槽，\"b\": 2 映射到了索引为 0 的哈希槽，\"c\": 3 映射到了索引为 6 的哈希槽。当然实际情况未必是这样，这里只是打个比方。 然后我们再添加一个键值对 mp[\"d\"] = 4，首先要将 \"d\" 映射成索引，假设映射出的索引为 0，由于 dk_indices[0] 的值为 1，而 dk_entries[1].me_key 不等于 \"d\"，所以出现冲突，于是哈希值右移 5 位，重新映射。 第二次映射出的索引为 6，由于 dk_indices[6] 的值为 2，而 dk_entries[2].me_key 也不等于 \"d\"，说明第二次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第三次映射出的索引为 4，由于 dk_indices[4] 的值为 0，而 dk_entries[0].me_key 也不等于 \"d\"，说明第三次映射出的索引也冲突了，那么哈希值继续右移 5 位，重新映射。 第四次映射出的索引为 2，而 dk_indices[2] 的值为 -1，说明该槽没有人用，于是将 entry 追加到键值对数组中，并将它在 dk_entries 中的索引赋值给 dk_indices[2]。还是那句话，实际情况并不一定是这样，这里只是为了方便解释而刻意举的例子。 所以对于 \"d\": 4 这个键值对来说，0 -> 6 -> 4 -> 2 就是它的冲突探测链，在查找的时候也会按照这个顺序进行查找。比如我们获取 mp[\"d\"]，那么会经历如下过程。 将 key=\"d\" 映射成索引，得到 0，但 dk_entries[dk_indices[0]].me_key 不等于 \"d\"，所以改变策略，重新映射。 第二次映射得到索引 6，但 dk_entries[dk_indices[6]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第三次映射得到索引 4，但 dk_entries[dk_indices[4]].me_key 依旧不等于 \"d\"，所以改变策略，重新映射。 第四次映射得到索引 2，发现 dk_entries[dk_indices[2]].me_key 等于 \"d\"，说明找到了指定的 entry，于是返回它的 value。 以上就是查找的整个过程，这时如果将 key=\"c\" 的 entry 删掉，比如执行 mp.pop(\"c\")，那么会发生什么呢？ 因为 \"c\" 映射到了索引为 6 的槽，当它被删除时，要将 dk_entries[dk_indices[6]] 的 me_key 和 me_value 都设置为 NULL，以及将 dk_indices[6] 设置为 DKIX_DUMMY。然后我们再获取 mp[\"d\"]，第二次映射会得到索引 6，发现该槽存储的值为 -2，就知道该槽并不是探测链的终点，于是会继续映射。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 哈希表删除元素源码解析","id":"184","title":"哈希表删除元素源码解析"},"185":{"body":"回顾一下字典的结构： 我们说 ma_used 字段表示字典的长度，它充当了 ob_size，而 dk_nentries 字段表示键值对数组中存储的键值对的个数，那么问题来了，这两个字段啥区别呢？从字面意思来看，这两者似乎是等价的。 相信这个问题对你来说没有任何难度，假设当前添加了 4 个键值对，那么 ma_used 和 dk_nentries 就都是 4。但如果再删除一个键值对，那么 ma_used 会变成 3，而 dk_nentries 还是 4。 所以 ma_used 会随着键值对的删除而减少，但 dk_nentries 保持不变，我们验证一下。 from ctypes import * class PyDictKeysObject(Structure): _fields_ = [(\"dk_refcnt\", c_ssize_t), (\"dk_size\", c_ssize_t), (\"dk_lookup\", c_void_p), (\"dk_usable\", c_ssize_t), (\"dk_nentries\", c_ssize_t), (\"dk_indices\", c_char * 8)] class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", POINTER(PyDictKeysObject)), (\"ma_values\", c_void_p)] d = {1: 1, 2: 2, 3: 3, 4: 4}\nobj = PyDictObject.from_address(id(d))\nprint(obj.ma_used) # 4\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 删除一个键值对\nd.pop(1)\nprint(obj.ma_used) # 3\nprint(obj.ma_keys.contents.dk_nentries) # 4\n# 再删除一个\nd.pop(2)\nprint(obj.ma_used) # 2\nprint(obj.ma_keys.contents.dk_nentries) # 4 结果和我们分析的一样，这就是 ma_used 和 dk_nentries 的区别。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » ma_used 和 dk_nentries 的区别","id":"185","title":"ma_used 和 dk_nentries 的区别"},"186":{"body":"以上我们就介绍了哈希表是怎么删除元素的，以及相关的具体细节，下一篇文章来说一说字典的创建，以及它的一些方法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"43. 哈希表是怎么删除元素的，能直接删除吗？ » 小结","id":"186","title":"小结"},"187":{"body":"到目前为止，我们对字典应该已经有了非常细致的了解了，本篇文章来聊一聊字典的创建和相关操作，通过底层的源码实现，来进一步剖析字典。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 楔子","id":"187","title":"楔子"},"188":{"body":"字典在底层对应 PyDictObject 实例，它是怎么创建的呢？解释器提供了 PyDict_New 函数，会创建一个容量为 8 的字典。 // Objects/dictobject.c // 对于结合表，键值对均由 PyDictKeysObject 维护\n// 它一旦被创建，那么 dk_indices 的长度至少是 8\n// 至于 dk_indices 里面的元素初始为 -1，表示哈希槽尚未被使用\nstatic PyDictKeysObject empty_keys_struct = { 1, /* dk_refcnt */ 1, /* dk_size */ lookdict_split, /* dk_lookup */ 0, /* dk_usable (immutable) */ 0, /* dk_nentries */ {DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY, DKIX_EMPTY}, /* dk_indices */\n}; #define Py_EMPTY_KEYS &empty_keys_struct\nstatic PyObject *empty_values[1] = { NULL }; PyObject *\nPyDict_New(void)\n{ dictkeys_incref(Py_EMPTY_KEYS); return new_dict(Py_EMPTY_KEYS, empty_values);\n} static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 字典也有缓存池，关于缓存池我们之后再说，这里先不管 if (numfree) { mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); _Py_NewReference((PyObject *)mp); } else { // 为字典申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); if (mp == NULL) { // 由于是先为 PyDictKeysObject 申请内存 // 所以当 PyDictObject 的内存申请失败时，还要处理 PyDictKeysObject dictkeys_decref(keys); if (values != empty_values) { free_values(values); } return NULL; } } // 字段初始化，而 keys 和 values 都是外界提前创建好，然后传过来的 mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 所以整个过程分为两步： 先创建 PyDictKeysObject 实例，底层默认提供了一个 Py_EMPTY_KEYS。 再创建 PyDictObject 实例，然后通过 ma_keys 字段使两者建立联系。 PyDictObject 实例的创建过程我们已经知道了，接下来是 PyDictKeysObject 实例的创建，只有它创建了，才能作为参数传递给 new_dict 函数。 // Objects/dictobject.c static PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // USABLE_FRACTION(size) 表示键值对数组的长度 // 它等于哈希索引数组长度的 2/3 usable = USABLE_FRACTION(size); // 基于哈希索引数组的长度，计算每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 不仅是 PyDictObject，PyDictKeysObject 同样也有自己的缓存池 // 关于它的缓存池，同样之后再聊，这里先不关心 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } // 为 PyDictKeysObject 申请内存，当然还包括两个数组 // 哈希索引数组的内存大小为 es * size // 键值对数组的大小为 sizeof(PyDictKeyEntry) * usable else { dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 字段初始化 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // memset 是一个 C 库函数：memset(p, val, size) // 作用是从指针 p 开始，将之后的 size 个字节的值全部初始化为 val // 显然这里是将哈希索引数组的元素都设置为 -1，注：(char)0xff == -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中每个 entry 的字段都设置为 0 // entry 的内存已经申请了，但还没有保存任何的键值对 // 所以将 me_hash、me_key、me_value 全部设置为 0 // 注：对于指针类型来说，赋值为 0 和 NULL 是等价的，因为 NULL 保存的地址就是 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 以上就是 PyDictKeysObject 实例的创建，当它创建完毕后，再作为参数传递给 new_dict 函数创建 PyDictObject 实例，整个过程还是比较简单的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典的创建","id":"188","title":"字典的创建"},"189":{"body":"首先类型对象定义了三个方法簇： tp_as_number：实例对象作为数值型对象拥有的方法； tp_as_sequence：实例对象作为序列型对象拥有的方法； tp_as_mapping：实例对象作为映射型对象拥有的方法； 当然啦，这三个方法簇对实例对象的类型要求并不严格，比如字符串作为序列型对象，也可以实现 tp_as_number，像字符串实现了里面的取模运算符，用于格式化。 那么字典呢，它的这几个方法簇都定义了哪些方法呢？ // Objects/dictobject.c static PySequenceMethods dict_as_sequence = { 0, /* sq_length */ 0, /* sq_concat */ 0, /* sq_repeat */ 0, /* sq_item */ 0, /* sq_slice */ 0, /* sq_ass_item */ 0, /* sq_ass_slice */ PyDict_Contains, /* sq_contains */ 0, /* sq_inplace_concat */ 0, /* sq_inplace_repeat */\n}; static PyMappingMethods dict_as_mapping = { (lenfunc)dict_length, /*mp_length*/ (binaryfunc)dict_subscript, /*mp_subscript*/ (objobjargproc)dict_ass_sub, /*mp_ass_subscript*/\n}; 以上就是字典的几个方法簇，我们从 Python 的角度来演示一下。 d = {\"a\": 1, \"b\": 2, \"c\": 3, \"d\": 4} # dict_as_sequence.sq_contains：判断 key 是否存在\nprint(\"a\" in d) # True # dict_as_mapping.dict_length：返回字典长度\nprint(len(d)) # 4 # dict_as_mapping.dict_subscript：基于 key 获取 value\nprint(d[\"a\"]) # 1 # dict_as_mapping.dict_ass_sub：设置 key、value\nd[\"高老师\"] = \"美男子\"\nprint(d[\"高老师\"]) # 美男子 接下来我们就从源码的角度，来看看这些方法是怎么实现的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 字典都有哪些方法？","id":"189","title":"字典都有哪些方法？"},"19":{"body":"下面来介绍一些常见的类型在底层的定义。 Python 底层的 C API 和对象的命名都遵循统一的标准，比如类型对象均以 Py***_Type 的形式命名，当然啦，它们都是 PyTypeObject 结构体实例。所以我们发现，Python 里的类在底层是以全局变量的形式静态定义好的。 所以实例对象可以有很多个，但对应的类型对象则是唯一的，在底层直接以全局变量的形式静态定义好了。比如列表的类型是 list，列表可以有很多个，但 list 类型对象则全局唯一。 data1 = [1, 2, 3]\ndata2 = [4, 5, 6]\nprint( data1.__class__ is data2.__class__ is list\n) # True 如果站在 C 的角度来理解的话： data1 和 data2 变量均指向了列表，列表在底层对应 PyListObject 结构体实例，里面字段的含义之前说过。但需要注意的是，指针数组里面保存的是对象的指针，而不是对象。不过为了方便，图中就用对象代替了。 然后列表的类型是 list，在底层对应 PyList_Type，它是 PyTypeObject 结构体实例，保存了列表的元信息（比如内存分配信息、支持的相关操作等）。 而将这两者关联起来的便是 ob_type，它位于 PyObject 中，是所有对象都具有的。因为变量只是一个 PyObject * 指针，那么解释器要如何得知变量指向的对象的类型呢？答案便是通过 ob_type 字段。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 一些常见的类型对象","id":"19","title":"一些常见的类型对象"},"190":{"body":"设置键值对，比如 d[\"a\"] = 1，那么会调用 dict_as_mapping 的 mp_ass_subscript，看一下它的具体逻辑。 // Objects/dictobject.c static int\ndict_ass_sub(PyDictObject *mp, PyObject *v, PyObject *w)\n{ // 参数 mp 指向字典，参数 v 指向 key，参数 w 指向 value // 虽然是设置键值对，但如果 w == NULL，那么也可以实现删除的效果 if (w == NULL) return PyDict_DelItem((PyObject *)mp, v); else return PyDict_SetItem((PyObject *)mp, v, w);\n} int\nPyDict_SetItem(PyObject *op, PyObject *key, PyObject *value)\n{ PyDictObject *mp; Py_hash_t hash; if (!PyDict_Check(op)) { PyErr_BadInternalCall(); return -1; } assert(key); assert(value); mp = (PyDictObject *)op; // 如果 key 不是字符串，或者 key 是字符串、但哈希值等于 -1（尚未计算） // 那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 如果是一个空字典，那么调用 insert_to_emptydict if (mp->ma_keys == Py_EMPTY_KEYS) { return insert_to_emptydict(mp, key, hash, value); } // 不是空字典，那么调用 insertdict return insertdict(mp, key, hash, value);\n} 所以最终会调用 insert_to_emptydict 或 insertdict，这里我们直接看 insertdict 函数的具体实现。 // Objects/dictobject.c static int\ninsertdict(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject *value)\n{ PyObject *old_value; PyDictKeyEntry *ep; Py_INCREF(key); Py_INCREF(value); // 字典有两种结构，分别是分离表和结合表 // 如果是分离表，那么 key 必须全部是字符串，因为它是为对象的属性字典引入的，而属性肯定是字符串 // 所以当字典使用的是分离表，并且插入的 key 不是字符串时，那么要重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) goto Fail; } // 探测函数，将 key 的哈希值映射成索引，该索引是哈希槽的索引 // 然后返回该哈希槽存储的键值对数组的索引，同时修改 old_value Py_ssize_t ix = mp->ma_keys->dk_lookup(mp, key, hash, &old_value); if (ix == DKIX_ERROR) goto Fail; assert(PyUnicode_CheckExact(key) || mp->ma_keys->dk_lookup == lookdict); MAINTAIN_TRACKING(mp, key, value); // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && old_value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) goto Fail; ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 在字典中不存在 if (ix == DKIX_EMPTY) { assert(old_value == NULL); // 如果键值对数组的长度小于等于 0，说明还没有为键值对数组分配内存 // 那么依旧调用 insertion_resize，该函数后续解释 if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) goto Fail; } // 按照相同的规则对 key 的哈希值进行映射，并返回哈希槽的索引 // 如果没有撞上 Dummy 态的哈希槽，那么 dk_indices[hashpos] 会等于 ix // 如果在映射的过程中，撞上了 Dummy 态的哈希槽，那么直接将该槽的索引返回 // 但不管是哪一种情况，我们都找到了一个合法的槽 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // dk_entries[dk_nentries] 便对应新的 entry，由于内存一开始便分配好了 // 因此所谓添加，其实就是修改它的 me_key 和 me_value 字段 // 将这两个字段的值，修改为参数 key 和参数 value ep = &DK_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries]; // 新的 entry 会添加在键值对数组中索引为 mp->ma_keys->dk_nentries 的位置 // 因为键值对始终是按照先来后到的顺序追加的，然后调用 dictkeys_set_index // 将 entry 在键值对数组中的索引，赋值给 mp->ma_keys->dk_indices[hashpos] dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); // 更新 me_key 和 me_value ep->me_key = key; ep->me_hash = hash; // 如果 mp->ma_values 不为空，证明字典使用的是分离表 if (mp->ma_values) { // 分离表的话，value 统一由 mp->ma_values 维护 // 至于 entry 里面的 me_value 字段则始终为 NULL assert (mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 否则说明字典使用的是结合表，将 entry->me_value 的值设置为 value else { ep->me_value = value; } mp->ma_used++; // 字典长度加 1 mp->ma_version_tag = DICT_NEXT_VERSION(); // 更新字典的版本号 mp->ma_keys->dk_usable--; // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_nentries++; // 键值对已存储的 entry 个数加 1 assert(mp->ma_keys->dk_usable >= 0); ASSERT_CONSISTENT(mp); return 0; } // 如果程序走到这里，说明 ix >= 0，即 key 已存在 // 那么当 old_value != value 时，要对值进行更新 if (old_value != value) { // 分离表，更新 mp->ma_values->values[ix] if (_PyDict_HasSplitTable(mp)) { mp->ma_values[ix] = value; if (old_value == NULL) { /* pending state */ assert(ix == mp->ma_used); mp->ma_used++; } } else { // 结合表，获取 entry，更新它的 me_value 字段 assert(old_value != NULL); DK_ENTRIES(mp->ma_keys)[ix].me_value = value; } mp->ma_version_tag = DICT_NEXT_VERSION(); } Py_XDECREF(old_value); /* which **CAN** re-enter (see issue #22653) */ ASSERT_CONSISTENT(mp); Py_DECREF(key); return 0; Fail: Py_DECREF(value); Py_DECREF(key); return -1;\n} 以上就是获取键值对，源码细节和我们之前分析哈希表时说的是一样的。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 设置键值对","id":"190","title":"设置键值对"},"191":{"body":"如果是获取 value，比如 v = d[\"a\"]，那么会调用 dict_as_mapping 的 mp_subscript，看一下它的具体逻辑。 // Objects/dictobject.c\nstatic PyObject *\ndict_subscript(PyDictObject *mp, PyObject *key)\n{ Py_ssize_t ix; Py_hash_t hash; PyObject *value; // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1，那么计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 探测函数，将 key 映射成索引，并返回对应的哈希槽存储的键值对数组的索引 // 并且在函数内部，还会对参数 value 进行修改，所以这里要传递二级指针 // 如果键值对存在，那么参数 value 就是对应的值，否则 value 会等于 NULL ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 当 ix == -1 或 value == NULL 时，说明 key 对应的键值对不存在 if (ix == DKIX_EMPTY || value == NULL) { if (!PyDict_CheckExact(mp)) { // 但如果 mp 不是字典，即 type(mp) is not dict // 那么说明 mp 的类型一定继承了 dict PyObject *missing, *res; _Py_IDENTIFIER(__missing__); // 检测 mp 是否定义了 __missing__ 方法，如果定义了则调用 // 所以该方法要定义在继承了 dict 的子类中 missing = _PyObject_LookupSpecial((PyObject *)mp, &PyId___missing__); if (missing != NULL) { res = PyObject_CallFunctionObjArgs(missing, key, NULL); Py_DECREF(missing); return res; } else if (PyErr_Occurred()) return NULL; } // 到这里说明 key 不存在，并且也没有定义 __missing__，那么 KeyError _PyErr_SetKeyError(key); return NULL; } // 否则说明键值对存在，那么增加引用计数，返回 value Py_INCREF(value); return value;\n} 所以获取 value 的话，也比较简单，关键在于里面有一个 __missing__ 方法，我们来解释一下。 class Dict(dict): def __getitem__(self, item): return super().__getitem__(item) def __missing__(self, key): return f\"不存在的 key：{key}\" d = Dict({\"a\": 1, \"b\": 2})\n# 会执行 Dict.__getitem__(d, \"a\")\n# 在内部会调用字典的 __getitem__\nprint(d[\"a\"]) # 1\nprint(d[\"b\"]) # 2 # 而在调用字典的 __getitem__ 时，如果发现 key 不存在\n# 那么会尝试寻找 __missing__ 方法\nprint(d[\"c\"]) # 不存在的 key：c\nprint(d[\"高老师\"]) # 不存在的 key：高老师 以上就是获取键值对。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 基于 key 获取 value","id":"191","title":"基于 key 获取 value"},"192":{"body":"关于字典是怎么创建的，以及它添加键值对、基于键获取值的源码细节，我们就分析完了。当然还没有结束，字典还有很多的自定义方法，我们下一篇文章来剖析这些自定义方法的实现细节。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"44. 字典是怎么创建的，支持的操作又是如何实现的？ » 小结","id":"192","title":"小结"},"193":{"body":"上一篇文章我们介绍了字典的创建过程，和一些基本操作，这些操作都对应一个魔法方法。但除了这些魔法方法之外，每个对象还可以单独定义很多自己的方法，这些方法统一由类型对象的 tp_methods 字段维护，当然这些之前已经说过了。 里面有很多的自定义方法，比如 get、pop、setdefault 等等，我们来剖析一下。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 楔子","id":"193","title":"楔子"},"194":{"body":"获取指定 key 对应的 value，如果 key 不存在，那么返回默认值。 d = {\"name\": \"古明地觉\"}\nprint(d.get(\"name\"))\n\"\"\"\n古明地觉\n\"\"\"\n# key 不存在，返回默认值 None\nprint(d.get(\"desc\"))\n\"\"\"\nNone\n\"\"\"\n# 当然也可以指定默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\" 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_GET_METHODDEF \\ {\"get\", (PyCFunction)(void(*)(void))dict_get, METH_FASTCALL, dict_get__doc__}, static PyObject *\ndict_get(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *return_value = NULL; // 返回值 PyObject *key; // 指定的 key PyObject *default_value = Py_None; // 默认值，默认为 None // get 方法接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"get\", nargs, 1, 2)) { goto exit; } // args[0] 便是指定的 key key = args[0]; if (nargs < 2) { goto skip_optional; } // args[1] 便是传入的默认值，如果有的话 default_value = args[1];\nskip_optional: // 调用 dict_get_impl return_value = dict_get_impl(self, key, default_value); exit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_get_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val = NULL; Py_hash_t hash; // 哈希值 Py_ssize_t ix; // 哈希槽存储的键值对数组的索引 // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 获取 key 对应的哈希槽存储的键值对数组的索引 ix = (self->ma_keys->dk_lookup) (self, key, hash, &val); if (ix == DKIX_ERROR) return NULL; // key 不存在，那么将默认值赋值给 val if (ix == DKIX_EMPTY || val == NULL) { val = default_value; } // 增加 val 的引用计数，然后返回 Py_INCREF(val); return val;\n} 以上就是字典的 get 方法，非常简单。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 get 方法","id":"194","title":"字典的 get 方法"},"195":{"body":"这是一个非常强大的方法，但是用的人不是很多。它和 get 方法类似，都是传入一个 key 和一个默认值，如果 key 存在，那么返回 key 对应的 value，否则返回默认值。但它和 get 方法不同的是，setdefault 在 key 不存在时，会将 key 和默认值添加到字典中。 d = {\"name\": \"古明地觉\"}\n# 当 key 存在时，两个方法的效果是一样的，都等价于 d[key]\nprint(d.get(\"name\"))\nprint(d.setdefault(\"name\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 但当 key 不存在时，就有差别了\n# \"desc\" 这个 key 不存在，返回默认值\nprint(d.get(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 并且原始的字典不受影响\nprint(d)\n\"\"\"\n{'name': '古明地觉'}\n\"\"\" # 但对于 setdefault 来说，key 不存在时\n# 会将 key 和默认值添加进去，然后返回默认值\nprint(d.setdefault(\"desc\", \"地灵殿美少女\"))\n\"\"\"\n地灵殿美少女\n\"\"\"\n# 原始的字典会发生改变\nprint(d)\n\"\"\"\n{'name': '古明地觉', 'desc': '地灵殿美少女'}\n\"\"\" 所以当获取的 key 不存在时，v = d.setdefault(key, value) 等价于如下。 d[key] = value v = d[key] 那么 setdefault 一般用在什么地方呢？举个例子。 data = [ (\"古明地觉\", \"2020\", 5), (\"古明地觉\", \"2020\", 2), (\"古明地觉\", \"2021\", 1), (\"古明地觉\", \"2021\", 4), (\"古明地觉\", \"2021\", 3), (\"芙兰朵露\", \"2022\", 7), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2022\", 3), (\"芙兰朵露\", \"2023\", 4), (\"芙兰朵露\", \"2023\", 1)\n]\n# 对于上面这种数据，我们需要变成下面这个样子\n\"\"\"\n{ '古明地觉': { '2020': [5, 2], '2021': [1, 4, 3] }, '芙兰朵露': { '2022': [7, 3, 3], '2023': [4, 1] }\n}\n\"\"\"\n# 如果使用 setdefault 方法，就非常好解决了\nd = {}\nfor name, year, cnt in data: d.setdefault(name, {}).setdefault(year, []).append(cnt)\nprint(d) 下面来看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_SETDEFAULT_METHODDEF \\ {\"setdefault\", (PyCFunction)(void(*)(void))dict_setdefault, METH_FASTCALL, dict_setdefault__doc__}, static PyObject *\ndict_setdefault(PyDictObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // 这部分和 get 方法是类似的 PyObject *return_value = NULL; PyObject *key; PyObject *default_value = Py_None; if (!_PyArg_CheckPositional(\"setdefault\", nargs, 1, 2)) { goto exit; } key = args[0]; if (nargs < 2) { goto skip_optional; } default_value = args[1];\nskip_optional: return_value = dict_setdefault_impl(self, key, default_value);\nexit: return return_value;\n} // Objects/dictobject.c\nstatic PyObject *\ndict_setdefault_impl(PyDictObject *self, PyObject *key, PyObject *default_value)\n{ PyObject *val; val = PyDict_SetDefault((PyObject *)self, key, default_value); Py_XINCREF(val); return val;\n} 所以核心在于 PyDict_SetDefault 函数，这个函数比较长，但逻辑不难理解。 // Objects/dictobject.c\nPyObject *\nPyDict_SetDefault(PyObject *d, PyObject *key, PyObject *defaultobj)\n{ PyDictObject *mp = (PyDictObject *)d; PyObject *value; Py_hash_t hash; if (!PyDict_Check(d)) { PyErr_BadInternalCall(); return NULL; } // 获取哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return NULL; } // 如果 mp->ma_keys 等于 Py_EMPTY_KEYS，证明字典是空的，那么 key 肯定不存在 // 将 key 和 defaultobj 添加进字典中，并返回 defaultobj if (mp->ma_keys == Py_EMPTY_KEYS) { if (insert_to_emptydict(mp, key, hash, defaultobj) < 0) { return NULL; } return defaultobj; } // 如果字典使用的是分离表，并且 key 不是字符串 // 意味着字典的结构要发生改变，重构为结合表 if (mp->ma_values != NULL && !PyUnicode_CheckExact(key)) { if (insertion_resize(mp) < 0) return NULL; } // 获取哈希槽存储的键值对数组的索引 Py_ssize_t ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value); if (ix == DKIX_ERROR) return NULL; // 分离表不仅要求 key 全部是字符串，并且不能删除，否则要重构为结合表 if (_PyDict_HasSplitTable(mp) && ((ix >= 0 && value == NULL && mp->ma_used != ix) || (ix == DKIX_EMPTY && mp->ma_used != mp->ma_keys->dk_nentries))) { if (insertion_resize(mp) < 0) { return NULL; } ix = DKIX_EMPTY; } // 如果 ix == -1，说明 key 不存在，那么要先添加键值对 if (ix == DKIX_EMPTY) { PyDictKeyEntry *ep, *ep0; value = defaultobj; // 是否还有可用空间，如果没有，调用 insertion_resize if (mp->ma_keys->dk_usable <= 0) { if (insertion_resize(mp) < 0) { return NULL; } } // 返回 key 映射之后的哈希槽的索引 Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash); // 新添加的 entry 在键值对数组中的索引为 mp->ma_keys->dk_nentries // 将该索引赋值给 dk_indices[hashpose] ep0 = DK_ENTRIES(mp->ma_keys); ep = &ep0[mp->ma_keys->dk_nentries]; dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries); Py_INCREF(key); Py_INCREF(value); MAINTAIN_TRACKING(mp, key, value); ep->me_key = key; ep->me_hash = hash; // 如果字典是分离表 if (_PyDict_HasSplitTable(mp)) { // 值由 mp->ma_values 存储 assert(mp->ma_values[mp->ma_keys->dk_nentries] == NULL); mp->ma_values[mp->ma_keys->dk_nentries] = value; } // 如果字典是结合表，那么键和值均保存在 entry 中 else { ep->me_value = value; } // 字典长度加 1 mp->ma_used++; // 修改版本号 mp->ma_version_tag = DICT_NEXT_VERSION(); // 键值对数组还可以容纳的 entry 个数减 1 mp->ma_keys->dk_usable--; // 键值对数组已经容纳的 entry 个数加 1 mp->ma_keys->dk_nentries++; assert(mp->ma_keys->dk_usable >= 0); } // ... ASSERT_CONSISTENT(mp); // 返回 value return value;\n} 以上便是 setdefault 方法。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 setdefault 方法","id":"195","title":"字典的 setdefault 方法"},"196":{"body":"字典的 pop 方法之前已经说过了，这里来看一下 popitem 方法。 d = {\"x\": 1, \"y\": 2, \"z\": 3}\n# pop 方法可以弹出指定的 key，并返回对应的 value\n# 如果 key 不存在，并且没有指定默认值，会抛出 KeyError，否则返回默认值\nprint(d.pop(\"x\")) # 1 # 而 popitem 方法则是弹出字典的最后一个键值对\nd = {\"x\": 1, \"y\": 2, \"z\": 3}\nprint(d.popitem()) # ('z', 3)\nprint(d) # {'x': 1, 'y': 2} 下面看一下源码实现。 // Objects/clinc/dictobject.c.h\n#define DICT_POPITEM_METHODDEF \\ {\"popitem\", (PyCFunction)dict_popitem, METH_NOARGS, dict_popitem__doc__}, static PyObject *\ndict_popitem(PyDictObject *self, PyObject *Py_UNUSED(ignored))\n{ return dict_popitem_impl(self);\n} // Objects/dictobject.c\nstatic PyObject *\ndict_popitem_impl(PyDictObject *self)\n{ Py_ssize_t i, j; PyDictKeyEntry *ep0, *ep; PyObject *res; // 返回值，一个二元组，负责存储 key 和 value res = PyTuple_New(2); if (res == NULL) return NULL; // 如果字典的长度为 0，那么抛出 KeyError if (self->ma_used == 0) { Py_DECREF(res); PyErr_SetString(PyExc_KeyError, \"popitem(): dictionary is empty\"); return NULL; } // 如果字典使用分离表，那么当 popitem 之后，要重构为结合表 // 分离表要求 key 必须全部是字符串，并且不能删除键值对 if (self->ma_keys->dk_lookup == lookdict_split) { if (dictresize(self, DK_SIZE(self->ma_keys))) { Py_DECREF(res); return NULL; } } ENSURE_ALLOWS_DELETIONS(self); // 获取键值对数组 ep0 = DK_ENTRIES(self->ma_keys); // ma_keys->dk_nentries 表示键值对数组中已使用的 entry 个数 // 那么 entry 的最大索引就是 ma_keys->dk_nentries - 1 i = self->ma_keys->dk_nentries - 1; // 从 i 开始往前遍历，找到第一个 me_value != NULL 的 entry // 因为被删除的 entry 依旧会驻留在键值对数组中，但 me_key、me_value 被设置为 NULL while (i >= 0 && ep0[i].me_value == NULL) { i--; } assert(i >= 0); // 获取 entry ep = &ep0[i]; // 基于哈希槽存储的索引，获取哈希槽的索引 j = lookdict_index(self->ma_keys, ep->me_hash, i); assert(j >= 0); assert(dictkeys_get_index(self->ma_keys, j) == i); // 因为 entry 被删除了，所以对应的哈希槽存储的值要修改为 DKIX_DUMMY dictkeys_set_index(self->ma_keys, j, DKIX_DUMMY); // 将 key 和 value 保存在元组中 PyTuple_SET_ITEM(res, 0, ep->me_key); PyTuple_SET_ITEM(res, 1, ep->me_value); // 因为被弹出了，所以 entry 的 me_key 和 me_value 要重置为 NULL ep->me_key = NULL; ep->me_value = NULL; // 这一步一会儿解释 self->ma_keys->dk_nentries = i; // 键值对个数减 1 self->ma_used--; self->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(self); return res;\n} 以上就是 popitem 方法，但是里面有一行 self->ma_keys->dk_nentries = i 估计让人有些费解，我们解释一下。 首先当键值对数组的空间申请之后，entry 就已经存在了，初始状态下的 entry 的 me_key 和 me_value 均为 NULL。所以一个被伪删除的 entry 和初始的 entry 是等价的，下面假设有这么一个键值对数组。 对于一个容量为 16 的哈希表，它的键值对数组的长度为 10，由于 dk_nentries = 7，说明键值对数组使用了 7 个 entry。而在之后，第 2 个 entry 和第 7 个 entry 被删除了，一旦删除，那么它的 me_key 和 me_value 会被重置为 NULL，和初始 entry 是等价的。 这时候如果执行 popitem，那么会弹出最后一个 me_value 不为 NULL 的 entry，即没有被伪删除的 entry，对于当前来说就是第 6 个 entry。所以源码中的 i 初始等于 dk_nentries - 1，然后往前遍历，最终会找到索引为 5 的 entry，所以循环之后 i = 5。然后将索引为 5 的 entry 的 me_key 和 me_value 设置为 NULL，因为它被删除了。 注意：这里关键来了，既然变量 i 保存的是最后一个 me_value != NULL 的 entry 的索引，那么当它被删除之后，就意味着从索引 i 开始，后面所有的 entry 都相当于回归到了初始状态，那么直接将 dk_nentries 设置为 i。 由于 dk_nentries 被设置为 i，后续再添加键值对时，就会添加到索引为 i 的位置。对于当前来说，添加键值对时，修改的是 dk_entries[5] 的 me_key 和 me_value，而不是 dk_entries[7] 的 me_key 和 me_value。 所以通过 popitem 方法，被删除的 entry 是有可能实现复用的。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 字典的 popitem 方法","id":"196","title":"字典的 popitem 方法"},"197":{"body":"以上我们就简单分析了字典的几个自定义方法，下一篇文章来聊一聊字典的扩容。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"45. 字典的自定义方法是怎么实现的？ » 小结","id":"197","title":"小结"},"198":{"body":"在介绍字典的底层结构时我们看到，当已使用的 entry 数量达到总容量的 2/3 时，会发生扩容。 而在早期，哈希表只使用一个键值对数组，这个键值对数组不仅要存储具体的 entry，还要承载哈希索引数组的功能。本来这个方式很简单，但是内存浪费严重，于是后面 Python 官方就将一个数组拆成两个数组来实现。 不是说只能用 2/3 吗？那就只给键值对数组申请 2/3 容量的空间，并且只负责存储键值对。至于索引，则由哈希索引数组来承载。通过将 key 映射成索引，找到指定的哈希槽，再根据槽里面存储的索引，找到键值对数组中存储的 entry。 因此减少内存开销的核心就在于，避免键值对数组的浪费。 所以哈希索引数组的长度就可以看成是哈希表的容量，而键值对数组的长度本身就是哈希索引数组长度的 2/3、或者说容量的 2/3。那么很明显，当键值对数组满了，就说明当前的哈希表要扩容了。 // Objects/dictobject.c\n#define GROWTH_RATE(d) ((d)->ma_used*3) 扩容之后的新哈希表的容量要大于等于 ma_used * 3，注意是大于等于 ma_used * 3，不是 dk_nentries * 3。因为 dk_nentries 还包含了被删除的 entry，但哈希表在扩容的候会将其丢弃，所以扩容之后新哈希表的容量取决于 ma_used。 当然啦，哈希表的容量还要等于 2 的幂次方，所以有两个条件： 大于等于 ma_used * 3； 等于 2 的幂次方； 基于以上两个限制条件，取到的最小值便是扩容之后的容量。而扩容的具体过程我们稍后会介绍，目前先来回顾一下基础知识。 以上是字典的底层结构，假设变量 mp 指向了 PyDictObject 实例，那么可以得到如下信息。 mp->ma_keys->dk_indices 便是哈希索引数组，它的长度便是哈希表的容量。 mp->ma_keys->dk_entries 便是键值对数组，里面的一个 entry 就是一个键值对。 如果字典使用的是结合表，那么 entry 的 me_key、me_value 字段负责存储键和值，此时 mp->ma_values 为 NULL。 如果字典使用的是分离表，那么 entry 的 me_key 字段负责存储键，me_value 字段则始终为 NULL，此时由 mp->ma_values 负责存储值，这种做法可以让多个字典共享一组 key，从而节省内存。 因为分离表是 Python 针对实例对象的属性字典单独设计的，我们平时创建的都是结合表，所以一开始并没有讨论分离表。但分离表其实非常简单，这里来补充一下吧。现在假设有一个字典，里面有三个键值对 \"a\": 1, \"b\": 2, \"c\": 3，我们看一下分别使用结合表和分离表存储时，字典的结构是什么样子。 所以结合表是键和值存在一起，分离表是键和值分开存储，非常好理解。我们自己创建的字典，使用的都是结合表，分离表是为了减少对象属性字典的内存使用而专门引入的。因此对于一个分离表而言，它的 key 一定都是字符串，否则不可能是分离表。而如果 key 都是字符串，那么既可以是分离表，也可以是结合表。 接着是转换关系：分离表可以重构为结合表，但反过来不行。 好，下面我们来看一下扩容逻辑，它由 dictresize 函数负责。 // Objects/dictobject.c #define PyDict_MINSIZE 8 static int\ndictresize(PyDictObject *mp, Py_ssize_t minsize)\n{ // 参数 minsize 表示字典的 ma_used * 3，即长度 * 3 Py_ssize_t newsize, numentries; // mp->ma_keys PyDictKeysObject *oldkeys; // mp->ma_values PyObject **oldvalues; // mp->ma_values->dk_entries PyDictKeyEntry *oldentries, *newentries; /* Find the smallest table size > minused. */ // 初始容量为 8，如果 newsize < minsize，那么不断循环 // 直到条件不满足时，便找到了大于等于 minsize 的最小 2 的幂次方数 // newsize 便是字典扩容之后的新容量 for (newsize = PyDict_MINSIZE; newsize < minsize && newsize > 0; newsize <<= 1) ; if (newsize <= 0) { PyErr_NoMemory(); return -1; } // 获取扩容之前的 ma_keys oldkeys = mp->ma_keys; // 在介绍字典的创建时，我们说过这个函数，它负责为 PyDictKeysObject 实例申请内存 mp->ma_keys = new_keys_object(newsize); if (mp->ma_keys == NULL) { mp->ma_keys = oldkeys; return -1; } assert(mp->ma_keys->dk_usable >= mp->ma_used); // 设置探测函数 if (oldkeys->dk_lookup == lookdict) mp->ma_keys->dk_lookup = lookdict; // 字典的长度 numentries = mp->ma_used; // 扩容之前的键值对数组 oldentries = DK_ENTRIES(oldkeys); // 扩容之后的键值对数组 newentries = DK_ENTRIES(mp->ma_keys); // 扩容之前的 ma_values oldvalues = mp->ma_values; // 如果 oldvalues 不为 NULL，说明字典使用的是分离表 // 那么当字典发生扩容时，要转成结合表 if (oldvalues != NULL) { // 将旧的键值对数组的 entry 拷贝到新的键值对数组中 for (Py_ssize_t i = 0; i < numentries; i++) { assert(oldvalues[i] != NULL); PyDictKeyEntry *ep = &oldentries[i]; PyObject *key = ep->me_key; Py_INCREF(key); // key 始终存储在 entry 中 newentries[i].me_key = key; // 设置哈希值 newentries[i].me_hash = ep->me_hash; // 将 mp->ma_values 里面的值，赋值给 entry->me_value newentries[i].me_value = oldvalues[i]; } // 旧的 ma_keys 和 ma_values 要释放掉 dictkeys_decref(oldkeys); mp->ma_values = NULL; if (oldvalues != empty_values) { free_values(oldvalues); } } // 说明字典使用的是结合表，重构的结果依旧是结合表 else { // combined table. // 如果 entry 的数量等于字典的长度，说明没有被删除的 entry，那么直接 memcpy 过去即可 if (oldkeys->dk_nentries == numentries) { memcpy(newentries, oldentries, numentries * sizeof(PyDictKeyEntry)); } // 否则遍历 oldentries，将 me_value != NULL 的 entry 拷贝过去 else { PyDictKeyEntry *ep = oldentries; for (Py_ssize_t i = 0; i < numentries; i++) { while (ep->me_value == NULL) ep++; newentries[i] = *ep++; } } assert(oldkeys->dk_lookup != lookdict_split); assert(oldkeys->dk_refcnt == 1); // 缓存池逻辑，后续聊 if (oldkeys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { _Py_DEC_REFTOTAL; keys_free_list[numfreekeys++] = oldkeys; } else { _Py_DEC_REFTOTAL; PyObject_FREE(oldkeys); } } // 到此键值对数组的元素就拷贝完了，然后还要进行索引映射，并存储在哈希槽中 build_indices(mp->ma_keys, newentries, numentries); // dk_usable 表示还可以容纳多少个键值对 // dk_nentries 表示已经容纳了多少个键值对 // 而 numentries 表示字典的长度，所以重构之后 // dk_usable 的大小要减去 numentries，dk_nentries 直接等于 numentries mp->ma_keys->dk_usable -= numentries; mp->ma_keys->dk_nentries = numentries; return 0;\n} 因为要对哈希表的种类分情况讨论，所以导致代码有点长，但逻辑不难理解： 首先确定哈希表的容量，它要满足 2 的幂次方，并且大于等于 ma_used * 3。 为 ma_keys 重新申请内存。 根据哈希表的种类分情况讨论，但核心都是将旧的没有被删除的 entry 搬过去。 释放 ma_keys，如果字典之前是分离表，还要释放 ma_values。 以上就是哈希表的扩容，或者说字典的扩容，我们就介绍到这儿，下一篇文章来介绍字典的缓存池。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"46. 字典是怎么扩容的？它会经历哪些过程？","id":"198","title":"46. 字典是怎么扩容的？它会经历哪些过程？"},"199":{"body":"本篇文章来聊一聊字典的缓存池，我们知道字典有一个 ma_keys 字段和一个 ma_values 字段。当哈希表为分离表时，键由 ma_keys 维护，值由 ma_values 维护；当哈希表为结合表时，键和值均由 ma_keys 维护。 那么当我们销毁一个 PyDictObject 时，也肯定要先释放 ma_keys 和 ma_values。 如果是分离表，会将每个 value 的引用计数减 1，然后释放 ma_values；再将每个 key 的引用计数减 1，然后释放 ma_keys。最后再释放 PyDictObject 本身。 如果是结合表，由于 key、value 都在 ma_keys 中，将每个 key、value 的引用计数减 1 之后，只需释放 ma_keys 即可。最后再释放 PyDictObject 本身。 整个过程还是很清晰的，只不过这里面遗漏了点什么东西，没错，就是缓存池。在介绍浮点数的时候，我们说不同的对象都有自己的缓存池，当然字典也不例外。并且除了 PyDictObject 之外，PyDictKeysObject 也有相应的缓存池，毕竟它负责存储具体的键值对。 那么下面我们就来研究一下这两者的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 楔子","id":"199","title":"楔子"},"2":{"body":"我们上面说了， Python 解释器 = Python 编译器 + Python 虚拟机 ，当解释器执行 py 文件时都经历了哪些过程呢？ Read File、Scanner、Parser、Compiler 都是由 Python 编译器负责的，Code Eval 则由 Python 虚拟机负责。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。 而 Python 编译器和 Python 虚拟机组合起来，便是 Python 解释器。 如果你了解 Java，那么应该知道 Java 也有编译器和虚拟机。只不过 Java 的编译器和虚拟机是分开的，而 Python 则是整合在一起的。 不过在后续介绍 Python 源码的时候，我们暂不涉及 Python 编译器的部分，也就是 Parser 目录里面的代码不做分析，因为涉及到编译原理。而且编译这一过程也不是 Python 语言独有的，任何一门编程语言、当然还有 SQL 都会涉及到编译。所以探究 Python 代码的编译过程没太大意义，我们的重点是 Python 代码的编译结果，以及虚拟机是如何执行的？","breadcrumbs":"1. CPython 源码长什么样子？ » 解释器、编译器、虚拟机","id":"2","title":"解释器、编译器、虚拟机"},"20":{"body":"不同类型的实例对象，在底层由不同的结构体实现，比如整数对应 PyLongObject 实例、浮点数对应 PyFloatObject 实例、列表对应 PyListObject 实例等等。 但所有的类型对象，在底层由同一个结构体实现，它们都是 PyTypeObject 实例。而 PyTypeObject 结构体在实例化时，内部字段接收的值不同，那么生成的类型对象也不同，可以是 PyLong_Type、PyFloat_Type、PyList_Type 等等。并且每个类型对象都是唯一的，比如在程序中可以创建很多个列表（PyListObject 实例），但类型对象 <class 'list'>（PyList_Type）只会存在一个。 因为类型对象都是静态定义在源码中的，并以全局变量的形式存在。而将实例对象和类型对象关联起来的，则是实例对象的 ob_type 字段，在 Python 里面可以通过调用 type 或者获取 __class__ 属性查看。 关于类型对象的更多内容，后续会继续介绍。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"5. 详解 PyTypeObject，Python 类型对象的载体 » 小结","id":"20","title":"小结"},"200":{"body":"字典的缓存池和列表的缓存池高度相似，都是采用数组实现的，并且容量也是 80 个。 // Objects/dictobject.c\n#define PyDict_MAXFREELIST 80 static PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0; 下面看一下字典的销毁过程，因为放入缓存池这个动作，一定是在对象销毁时发生的。 // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 将 dk_refcnt 减 1 // 如果字典是结合表，那么 dk->dk_refcnt 减 1 之后一定为 0 // 如果字典是分离表，那么 dk->dk_refcnt 减 1 之后则不一定为 0 if (--dk->dk_refcnt == 0) { // 释放 ma_keys，该函数稍后再聊 free_keys_object(dk); }\n} static void\ndict_dealloc(PyDictObject *mp)\n{ PyObject **values = mp->ma_values; PyDictKeysObject *keys = mp->ma_keys; Py_ssize_t i, n; // 因为要被销毁，所以让 GC 不再跟踪 PyObject_GC_UnTrack(mp); // 用于延迟释放 Py_TRASHCAN_BEGIN(mp, dict_dealloc) // 如果 values 不为 NULL，说明是分离表 if (values != NULL) { if (values != empty_values) { // 将每个 value 的引用计数减 1 for (i = 0, n = mp->ma_keys->dk_nentries; i < n; i++) { Py_XDECREF(values[i]); } // 释放 ma_values free_values(values); } // 将 ma_keys->dk_refcnt 减 1，至于是否会释放 ma_keys // 则看是否还有其它组的 value 使用它 dictkeys_decref(keys); } // 否则说明是结合表 else if (keys != NULL) { // 结合表的话，dk_refcnt 一定等于 1，因为每组 value 都独占一组 key assert(keys->dk_refcnt == 1); // dk_refcnt 减 1 之后等于 0，内部会调用 free_keys_object // 在里面会先将每个 key、value 的引用计数减 1，然后再释放 ma_keys dictkeys_decref(keys); } // 如果 numfree 没达到 80，那么放入缓存池 if (numfree < PyDict_MAXFREELIST && Py_TYPE(mp) == &PyDict_Type) // PyDictObject 缓存池是一个数组，直接添加在数组的尾部即可，然后 numfree 自增 1 free_list[numfree++] = mp; else // 否则将空间交还给系统堆 Py_TYPE(mp)->tp_free((PyObject *)mp); Py_TRASHCAN_END\n} 同理，当创建字典时，也会优先从缓存池里面获取。 // Objects/dictobject.c static PyObject *\nnew_dict(PyDictKeysObject *keys, PyObject **values)\n{ PyDictObject *mp; assert(keys != NULL); // 如果 numfree != 0，证明缓存池有可用元素 if (numfree) { // 从缓存池当中获取 mp = free_list[--numfree]; assert (mp != NULL); assert (Py_TYPE(mp) == &PyDict_Type); // 将引用计数设置为 1 _Py_NewReference((PyObject *)mp); } else { // 否则从堆区申请内存 mp = PyObject_GC_New(PyDictObject, &PyDict_Type); // ... } // 初始化字段，然后返回 (PyObject *)mp mp->ma_keys = keys; mp->ma_values = values; mp->ma_used = 0; mp->ma_version_tag = DICT_NEXT_VERSION(); ASSERT_CONSISTENT(mp); return (PyObject *)mp;\n} 因此在缓存池的实现上，字典和列表有着很高的相似性。不仅都由数组实现，在销毁的时候也会放在数组的尾部，创建的时候也会从数组的尾部获取。当然啦，因为这么做符合数组的特性，如果销毁和创建都是在数组的头部操作，那么时间复杂度就从 O(1) 变成了 O(n)。 我们用 Python 来测试一下： d1 = {k: 1 for k in \"abcdef\"}\nd2 = {k: 1 for k in \"abcdef\"}\nprint(\"id(d1):\", id(d1))\nprint(\"id(d2):\", id(d2))\n# 放到缓存池的尾部\ndel d1\ndel d2\n# 缓存池：[d1, d2] # 从缓存池的尾部获取\n# 显然 id(d3) 和上面的 id(d2) 是相等的\nd3 = {k: 1 for k in \"abcdefghijk\"}\n# id(d4) 和上面的 id(d1) 是相等的\nd4 = {k: 1 for k in \"abcdefghijk\"}\nprint(\"id(d3):\", id(d3))\nprint(\"id(d4):\", id(d4))\n\"\"\"\nid(d1): 140079181793600\nid(d2): 140079181775488\nid(d3): 140079181775488\nid(d4): 140079181793600\n\"\"\" 输出结果和我们的预期是相符合的，以上就是 PyDictObject 的缓存池。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictObject 缓存池","id":"200","title":"PyDictObject 缓存池"},"201":{"body":"PyDictKeysObject 也有自己的缓存池，同样基于数组实现，大小是 80。 // Objects/dictobject.c #define PyDict_MAXFREELIST 80\n// PyDictObject 缓存池以及容量\nstatic PyDictObject *free_list[PyDict_MAXFREELIST];\nstatic int numfree = 0;\n// PyDictKeysObject 缓存池以及容量\nstatic PyDictKeysObject *keys_free_list[PyDict_MAXFREELIST];\nstatic int numfreekeys = 0; 来看一下 PyDictKeysObject 的销毁过程： // Objects/dictobject.c static inline void\ndictkeys_decref(PyDictKeysObject *dk)\n{ assert(dk->dk_refcnt > 0); _Py_DEC_REFTOTAL; // 分离表：多组 value 可以共享一组 key // 结合表：每组 value 独占一组 key // 因此要先将 dk_refcnt 减 1，如果结果为 0，那么才能释放 ma_keys if (--dk->dk_refcnt == 0) { free_keys_object(dk); }\n} static void\nfree_keys_object(PyDictKeysObject *keys)\n{ // 获取键值对数组 PyDictKeyEntry *entries = DK_ENTRIES(keys); Py_ssize_t i, n; // 遍历 dk_entries，减少 key、value 的引用计数 for (i = 0, n = keys->dk_nentries; i < n; i++) { Py_XDECREF(entries[i].me_key); // 如果是分离表，那么 me_value == NULL // 而当参数为 NULL 时，Py_XDECREF 不做任何处理 Py_XDECREF(entries[i].me_value); } // 放入缓存池，除了要保证缓存池没满之外，还要保证 dk_size = 8 // 也就是说，只有容量为 8 的哈希表的 PyDictKeysObject 才会被缓存 if (keys->dk_size == PyDict_MINSIZE && numfreekeys < PyDict_MAXFREELIST) { keys_free_list[numfreekeys++] = keys; return; } // 如果条件不满足，释放 ma_keys，将内存交还给系统堆 PyObject_FREE(keys);\n} 所以 PyDictKeysObject 的缓存池和列表的缓存池同样是高度相似的，只不过它想要被缓存，除了保证缓存池有剩余空间之外，还要满足哈希表的容量等于 8，这个限制是出于对内存方面的考量。 以上是 ma_keys 的销毁过程，再来看看它的创建过程。 // Objects/dictobject.c // 为 PyDictKeysObject 实例申请内存\nstatic PyDictKeysObject *new_keys_object(Py_ssize_t size)\n{ PyDictKeysObject *dk; Py_ssize_t es, usable; assert(size >= PyDict_MINSIZE); assert(IS_POWER_OF_2(size)); // 获取键值对数组的长度 usable = USABLE_FRACTION(size); // 计算哈希索引数组中每个元素的大小 if (size <= 0xff) { es = 1; } else if (size <= 0xffff) { es = 2; }\n#if SIZEOF_VOID_P > 4 else if (size <= 0xffffffff) { es = 4; }\n#endif else { es = sizeof(Py_ssize_t); } // 如果容量等于 8，并且缓存池有可用元素，那么从缓存池中获取 if (size == PyDict_MINSIZE && numfreekeys > 0) { dk = keys_free_list[--numfreekeys]; } else { // 否则在堆区申请内存，而内存包含三部分 // sizeof(PyDictKeysObject)：结构体 PyDictKeysObject 的大小 // es * size：哈希索引数组的大小 // sizeof(PyDictKeyEntry) * usable)：键值对数组的大小 dk = PyObject_MALLOC(sizeof(PyDictKeysObject) + es * size + sizeof(PyDictKeyEntry) * usable); if (dk == NULL) { PyErr_NoMemory(); return NULL; } } _Py_INC_REFTOTAL; // 初始化字段 dk->dk_refcnt = 1; dk->dk_size = size; dk->dk_usable = usable; dk->dk_lookup = lookdict_unicode_nodummy; dk->dk_nentries = 0; // 将哈希索引数组中的每个元素都设置成 -1 memset(&dk->dk_indices[0], 0xff, es * size); // 将键值对数组中的每个元素（entry）的所有字段都设置成 0 memset(DK_ENTRIES(dk), 0, sizeof(PyDictKeyEntry) * usable); return dk;\n} 非常简单，我们来验证一下。 from ctypes import * class PyObject(Structure): _fields_ = [(\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p)] class PyDictObject(PyObject): _fields_ = [(\"ma_used\", c_ssize_t), (\"ma_version_tag\", c_uint64), (\"ma_keys\", c_void_p), (\"ma_values\", c_void_p)] d1 = {k: 1 for k in \"komeiji satori\"}\nprint( \"d1.ma_keys:\", PyDictObject.from_address(id(d1)).ma_keys\n)\n# 键值对个数超过了 8，哈希表的容量必然也超过了 8\n# 那么当销毁 d1 的时候，d1.ma_keys 不会被缓存，而是会直接释放掉\ndel d1 d2 = {k: 1 for k in \"abc\"}\nprint( \"d2.ma_keys:\", PyDictObject.from_address(id(d2)).ma_keys\n)\n# 容量等于 8，所以 d2.ma_keys 会被缓存\ndel d2 d3 = {k: 1 for k in \"komeiji koishi\"}\nprint( \"d3.ma_keys:\", PyDictObject.from_address(id(d3)).ma_keys\n)\n# 尽管 d2 的 ma_keys 被缓存起来了，但是 d3 的 dk_size 大于 8\n# 因此它不会从缓存池中获取，而是重新创建 d4 = {k: 1 for k in \"abc\"}\nprint( \"d4.ma_keys:\", PyDictObject.from_address(id(d4)).ma_keys\n)\n# d4 的 dk_size 等于 8，因此它会从缓存池中获取，从而复用被销毁的 d2.ma_keys\n# 最终打印结果如下\n\"\"\"\nd1.ma_keys: 94324986272656\nd2.ma_keys: 140165216613312\nd3.ma_keys: 140165225069456\nd4.ma_keys: 140165216613312\n\"\"\" 从打印的结果来看，由于 d4.ma_keys 和 d2.ma_keys 是相同的，因此证实了我们的结论。不像列表和字典，它们是只要被销毁，就会放到缓存池里面，因为它们没有存储具体的数据，大小是固定的。但 PyDictKeysObject 不同，由于它存储了 entry，每个 entry 占 24 字节，如果内部的 entry 非常多，那么缓存起来会有额外的内存开销。因此 Python 的策略是，只有在哈希表容量等于 8 的时候，才会缓存。当然这三者在缓存池的实现上，是基本一致的。 不难看出，Python 在性能和内存使用方面都做了考量。但如果你追求更高的效率，那么也可以自己定制 Python 解释器，比如增大缓存池的容量等等，用更多的空间去换取时间。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » PyDictKeysObject 缓存池","id":"201","title":"PyDictKeysObject 缓存池"},"202":{"body":"到此，字典相关的内容就全部介绍完了。和元组一样，字典也在我们看不到的地方被大量使用，比如对象的属性字典、名字空间等等。正因为解释器内部也在大量使用字典，所以字典是一个被高度优化的数据结构，不仅要保证搜索效率，还要减少内存使用。 下一篇文章，我们来介绍 Python 的集合。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"47. 身虽死，道未消，解密字典的缓存池 » 小结","id":"202","title":"小结"},"203":{"body":"本篇文章来聊一聊 Python 的集合是怎么实现的？前面我们介绍了字典的实现原理，它底层是基于哈希表实现的，而集合也是如此。 事实上，集合就类似于没有 value 的字典。","breadcrumbs":"48. 解密集合的实现原理 » 楔子","id":"203","title":"楔子"},"204":{"body":"那么集合都有哪些用处呢？ 1）去重 chars = [\"a\", \"b\", \"a\", \"c\", \"c\"] print( list(set(chars))\n) # ['b', 'a', 'c'] 比如你需要监听一个队列，处理接收到的消息，但每一条消息都有一个编号，要保证具有相同编号的消息只能被处理一次，要怎么做呢？ 显然集合此时就派上用场了，我们可以创建一个集合，每来一条消息，就检测它的编号是否在集合中。如果存在，则说明消息已经被处理过了，忽略掉；如果不存在，说明消息还没有被处理，那么就将它的编号添加到集合中，然后处理消息。 2）判断某个序列是否包含指定的多个元素 data = [\"S\", \"A\", \"T\", \"O\", \"R\", \"I\"] # 现在要判断 data 是否包含 \"T\"、\"R\" 和 \"I\"\n# 如果使用列表的话\nprint( \"T\" in data and \"R\" in data and \"I\" in data\n) # True # 显然使用列表比较麻烦，并且效率也不高，于是我们可以使用集合\nprint( set(data) >= {\"T\", \"R\", \"I\"}\n) # True 同理，基于此方式，我们也可以检测一个字典是否包含指定的多个 key。 data = { \"name\": \"satori\", \"age\": 17, \"gender\": \"female\"\n} # 判断字典是否包含 name、age、gender 三个 key\nprint( data.keys() >= {\"name\", \"age\", \"gender\"}\n) # True # 字典的 keys 方法会返回一个 dict_keys 对象\n# 该对象具备集合的性质，可以直接和集合进行运算 显然对于这种需求，有了集合就方便多了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的使用场景","id":"204","title":"集合的使用场景"},"205":{"body":"然后我们来罗列一下集合支持的 API，在使用集合的时候要做到心中有数。 # 如果是创建一个空集合，那么要使用 set()\n# 写成 {} 的话，解释器会认为这是一个空字典\ns = {1, 2, 3} # 添加元素，时间复杂度是 O(1)\ns.add(4)\nprint(s) # {1, 2, 3, 4} # 删除指定的元素，如果元素不存在，会抛出 KeyError\n# 时间复杂度为 O(1)\ns.remove(2)\nprint(s) # {1, 3, 4} # 删除指定的元素，如果元素不存在则什么也不做\n# 时间复杂度为 O(1)\ns.discard(666)\nprint(s) # {1, 3, 4} # 随机弹出一个元素并返回，如果集合为空，会抛出 KeyError\n# 时间复杂度为 O(1)\nprint(s.pop()) # 1\nprint(s) # {3, 4} # 清空一个集合\ns.clear()\nprint(s) # set() # 还有一些 API，但我们更推荐使用操作符的方式\n# 两个集合取交集\nprint({1, 2} & {2, 3}) # {2} # 两个集合取并集\nprint({1, 2} | {2, 3}) # {1, 2, 3} # 两个集合取差集\n# s1 - s2，返回在 s1、但不在 s2 当中的元素\nprint({1, 2, 3} - {2, 3, 4}) # {1} # 两个集合取对称差集\n# s1 ^ s2，返回既不在 s1、也不在 s2 当中的元素\nprint({1, 2, 3} ^ {2, 3, 4}) # {1, 4} # 判断两个集合是否相等，也就是内部的元素是否完全一致\n# 顺序无所谓，只比较元素是否全部相同\nprint({1, 2, 3} == {3, 2, 1}) # True\nprint({1, 2, 3} == {1, 2, 4}) # False # 判断一个集合是否包含另一个集合的所有元素\n# 假设有两个集合 s1 和 s2：\n# 如果 s1 的元素都在 s2 中，那么 s2 >= s1；\n# 如果 s2 的元素都在 s1 中，那么 s1 >= s2；\n# 如果 s1 和元素和 s2 全部相同，那么 s1 == s2；\nprint({1, 2, 3} > {1, 2}) # True\nprint({1, 2, 3} >= {1, 2, 3}) # True 以上就是集合支持的一些 API，还是很简单的。","breadcrumbs":"48. 解密集合的实现原理 » 集合的 API","id":"205","title":"集合的 API"},"206":{"body":"集合和字典的内部都使用了哈希表，但字典的哈希表采用两个数组实现，而集合的哈希表采用一个数组实现。因此对于集合来说，这个数组不仅要存储 entry，并且映射出的索引也是该数组的索引。 下面看一下集合的底层结构长什么样子。 // Include/setobject.h typedef struct { // 定长对象的头部信息，但集合显然是一个变长对象 // 所以和字典一样，肯定有其它字段充当 ob_size PyObject_HEAD // Active 态的 entry 数量加上 Dummy 态的 entry 数量 // 一个 entry 就是哈希表里的一个元素，类型为 setentry // 因此在集合里面，一个 entry 就是一个 setentry 结构体实例 // 当删除集合的 entry 时，也必须是伪删除，因为要保证探测链不断裂 // 如果 entry 被伪删除了，那么它便处于 Dummy 态 Py_ssize_t fill; // Active 态的 entry 数量，显然这个 used 充当了 ob_size，也就是集合的元素个数 Py_ssize_t used; // 在看字典源码的时候，我们也见到了 mask，它用于和哈希值进行按位与、计算索引 // 并且这个 mask 等于哈希表的容量减 1，为什么呢？ // 假设哈希值等于 v，哈希表容量是 n，那么通过 v 对 n 取模即可得到一个位于 0 到 n-1 之间的数 // 然而取模运算的效率不高，应该使用 v&(n-1)，它的作用等价于 v%n，并且速度更快 // 但是注意，只有在 n 为 2 的幂次方的时候，v&(n-1) 和 v%n 才是完全等价的 // 所以哈希表的容量要求是 2 的幂次方，就是为了将取模运算优化成按位与运算 Py_ssize_t mask; // 指向 setentry 数组首元素的指针 // 这个 setentry 数组可以是下面的 smalltable，也可以是单独申请的一块内存 setentry *table; // 集合的哈希值，只适用于不可变集合 Py_hash_t hash; // 用于 pop 方法 Py_ssize_t finger; // 一个 setentry 类型的数组，集合的元素就存在里面，但记得我们前面说过 // 变长对象的内部不会存储具体的元素，而是会存储一个指针，该指针指向的内存区域才是用来存储具体元素的 // 这样当扩容的时候，只需要让指针指向新的内存区域即可，从而方便维护 // 没错，对于集合而言，只有在容量不超过 8 的时候，元素才会存在里面 // 而一旦超过了 8，那么会使用 malloc 单独申请内存 setentry smalltable[PySet_MINSIZE]; // 弱引用列表，不做深入讨论 PyObject *weakreflist;\n} PySetObject; 有了字典的经验，再看集合会简单很多。然后是 setentry，用于承载集合内的元素，那么它的结构长什么样呢？相信你能够猜到。 // Include/setobject.h typedef struct { PyObject *key; Py_hash_t hash;\n} setentry; 相比字典少了一个 value，这是显而易见的。 因此集合的结构很清晰了，假设有一个集合 {3.14, \"abc\", 666}，那么它的结构如下： 由于集合里面只有三个元素，所以它们都会存在 smalltable 数组里面，我们通过 ctypes 来证明这一点。 from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {3.14, \"abc\", 666}\n# 先来打印一下哈希值\nprint('hash(3.14) =', hash(3.14))\nprint('hash(\"abc\") =', hash(\"abc\"))\nprint('hash(666) =', hash(666))\n\"\"\"\nhash(3.14) = 322818021289917443\nhash(\"abc\") = 2548892134347232650\nhash(666) = 666\n\"\"\" # 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 0\n2 666\n3 322818021289917443\n4 0\n5 0\n6 2548892134347232650\n7 0\n\"\"\" 根据输出的哈希值我们可以断定，这三个元素确实存在了 smalltable 数组里面，并且 666 存在了数组索引为 2 的位置、3.14 存在了数组索引为 3 的位置、\"abc\" 存在了数组索引为 6 的位置。 当然，由于哈希值是随机的，所以每次执行之后打印的结果都可能不一样，但是整数除外，它的哈希值就是它本身。既然哈希值不一样，那么每次映射出的索引也可能不同，但总之这三个元素是存在 smalltable 数组里面的。 然后我们再考察一下其它字段： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\n# 集合里面有 3 个元素，所以 fill 和 used 都是 3\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 3 # 将集合元素全部删除\n# 这里不能用 s.clear()，原因一会儿说\nfor _ in range(len(s)): s.pop() # 我们知道哈希表在删除元素的时候是伪删除\n# 所以 fill 不变，但是 used 每次会减 1\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 0 fill 字段维护的是 Active 态的 entry 数量加上 Dummy 态的 entry 数量，所以删除元素时它的大小是不变的。但 used 字段的值每次会减 1，因为它维护的是 Active 态的 entry 的数量。所以在不涉及元素的删除时，这两者的大小是相等的。 另外我们说上面不能用 s.clear()，因为该方法表示清空集合，此时会重置为初始状态，然后 fill 和 used 都会是 0，这样就观察不到想要的现象了。 删除集合所有元素之后，我们再往里面添加元素，看看是什么效果： s = {3.14, \"abc\", 666}\npy_set_obj = PySetObject.from_address(id(s))\nfor _ in range(len(s)): s.pop() # 添加一个元素\ns.add(0)\nprint(py_set_obj.fill) # 3\nprint(py_set_obj.used) # 1 多次执行的话，会发现打印的结果可能是 3、1，也有可能是 4、1。至于原因，有了字典的经验，相信你肯定能猜到。 首先添加元素之后，used 肯定为 1。至于 fill，如果添加元素的时候，正好撞上了一个 Dummy 态的 entry，那么将其替换掉，此时 fill 不变，仍然是 3。但如果没有撞上 Dummy 态的 entry，而是添加在了新的位置，那么 fill 就是 4。 for i in range(1, 10): s.add(i)\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 10\ns.pop()\nprint(py_set_obj.fill) # 10\nprint(py_set_obj.used) # 9 在之前代码的基础上，继续添加 9 个元素，然后 used 变成了 10，这很好理解，因为此时集合有 10 个元素。但 fill 也是 10，这是为什么？很简单，因为哈希表扩容了，扩容时会删除 Dummy 态的 entry，所以 fill 和 used 是相等的。同理，如果再继续 pop，那么 fill 和 used 就又变得不相等了。","breadcrumbs":"48. 解密集合的实现原理 » 集合的底层结构","id":"206","title":"集合的底层结构"},"207":{"body":"集合的结构我们已经清楚了，再来看看它的初始化过程。我们调用类 set，传入一个可迭代对象，便可创建一个集合，这个过程是怎样的呢？ // Objects/setobject.c\nPyObject *\nPySet_New(PyObject *iterable)\n{ return make_new_set(&PySet_Type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为 PySetObject 申请内存，初始容量为 8 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 对字段做初始化 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; // 哈希表容量为 8 时，元素会存在 smalltable 里面 // 因此直接将 smalltable 赋值给 table so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 遍历 iterable，将迭代出的元素添加到集合中 // 关于这个函数，我们之后再介绍 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} 可以看到，集合的创建过程非常简单。","breadcrumbs":"48. 解密集合的实现原理 » 集合的创建","id":"207","title":"集合的创建"},"208":{"body":"字典和集合都是采用哈希表实现的，但字典的哈希表使用了两个数组，而集合的哈希表使用了一个数组，我们对比一下两者的差异。 假设有一个字典和一个集合，字典包含三个键值对，分别是 \"a\": 1、\"b\": 2、\"c\": 3，集合包含三个元素，分别是 \"a\"、\"b\"、\"c\"，然后映射出的索引分别是 2、5、3。 注：为了方便，这里的图画得没有那么严谨。比如集合的哈希表，里面的元素直接用字符串代替了，但其实它存储的是 setentry entry，而 entry 的 key 字段指向的才是字符串。当然这里我们心里清楚就好。 在介绍字典的时候我们说过，早期的字典内部的哈希表也是使用一个数组实现，除了 entry 会多存储一个 value 之外，其它和当前的集合是类似的。 但如果只使用一个数组实现，会导致内存浪费严重，因为哈希表必须要保证一定的稀疏性。所以后续字典内部的哈希表采用两个数组实现，将存储键值对的数组的长度压缩到原来的 2/3，至于映射出的索引则由另一个数组（哈希索引数组）来承载。虽然引入新的数组会带来额外的内存开销（假设大小为 m 字节），但存储键值对的数组不用再浪费 1/3 的空间（假设大小为 n 字节），只要 m 小于 n，那么使用两个数组就会更加节省内存。而在介绍字典的时候我们也看到了，m 是远小于 n 的。 那么问题来了，为什么集合不使用两个数组呢？很简单，因为使用一个数组实现哈希表会更简单，虽然也更加浪费内存。而集合和字典在哈希表的实现上之所以区别对待，还是使用频率的问题，解释器内部极度依赖字典，比如全局变量就是使用字典存储的。 可以说字典的效率高度影响着整个解释器的效率，字典的内存大小高度影响着解释器的内存占用。因此 Python 除了优化字典的搜索性能之外，还要尽可能地减少字典的内存大小。所以字典搞出了分离表、结合表，这一切操作都是为了将字典的内存占用降到最低。 至于集合，解释器对它的依赖就很小了，所以内部的哈希表，只采用了一个数组实现。虽然会有内存浪费，但无伤大雅。 好，回到上面的例子，如果将字典的键值对 \"b\": 2 和集合的元素 \"b\" 删掉，那么它们的结构会发生什么变化呢？ \"b\" 映射出的索引为 5，因此对于字典来说，会将索引为 5 的哈希槽存储的值设置为 dummy。然后是键值对数组，会将指定的 entry 的 me_key 和 me_value 字段全部设置为 NULL，相当于回归到了初始状态。 需要注意的是，数组一旦申请，那么 entry 的空间就已经有了，只是 me_key 和 me_value 字段均为 NULL。而所谓添加键值对，本质上也是修改指定 entry 的 me_key 和 me_value 字段。 对于集合来说，它只有一个数组，这个数组不仅要存储键值对，它的索引还表示 key 映射出的索引，当然这里的 key 指的就是集合的元素。\"b\" 映射出的索引为 5，所以将数组中索引为 5 的 entry->key 设置为 dummy。 但要注意的是，字典的 dummy 是一个整数，值为 -2（DKIX_DUMMY），因为哈希索引数组存储的是键值对数组的索引，显然这是一个整数。然后 key 映射出的索引是哈希索引数组的索引，如果对应的哈希槽存储的值是 -2，说明当前搜索的 key 对应的 entry 被删除了，应该继续向后搜索。 而集合的 dummy 是一个结构体指针，定义如下： // Objects/setobject.c\nstatic PyObject _dummy_struct;\n#define dummy (&_dummy_struct) 因为集合内部的哈希表只使用了一个数组，该数组存储的是 setentry。如果在查找的时候，发现对应的 entry 的 key 等于 dummy，就知道该 entry 被删除了，应该继续向后搜索。 好，继续回到上面的例子，假设这时候再给字典添加一个键值对 \"d\": 4，给集合添加一个元素 \"d\"，而字符串 \"d\" 映射出的索引也是 5，那么结构是怎样的呢？ 对于字典来说，键值对始终按照先来后到的顺序添加在键值对数组中，然后将它在键值对数组中的索引保存在指定的哈希槽中。由于索引为 5 的哈希槽保存的是 -2，处于 Dummy 态，因此直接将它设置为 3。 同理对于集合来说也是类似的。数组索引为 5 的位置保存的值等于 dummy，处于 Dummy 态，说明该元素被删除了，那么直接替换掉。因此整个过程的逻辑很简单：由于索引会存在冲突，所以元素删除之后，需要写入一个特殊的墓碑值，也就是这里的 dummy，因为要保证探测链不断裂。但如果集合后续添加元素时，正好撞上了一个 Dummy 态的 entry，那么会直接替换掉。 所以不论是字典还是集合，只要处于 Dummy 态，都可以替换掉。因为 Dummy 态存在的目的就是为了保证探测链不断裂，而替换之后探测链依旧是完整的。","breadcrumbs":"48. 解密集合的实现原理 » 字典和集合的哈希表的差异","id":"208","title":"字典和集合的哈希表的差异"},"209":{"body":"以上我们就剖析了集合的底层结构以及它的创建过程，不难发现集合的实现比字典要简单很多，并且集合没有自己的缓存池。 下一篇文章来介绍集合的相关操作。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"48. 解密集合的实现原理 » 小结","id":"209","title":"小结"},"21":{"body":"type 和 object 两者的关系估计会让很多人感到困惑，我们说 type 站在类型金字塔的顶端，任何对象按照类型追根溯源，最终得到的都是 type。而 object 站在继承金字塔的顶端，任何类型对象按照继承关系追根溯源，最终得到的都是 object。 因此我们可以得出以下结论： type 的父类是 object object 的类型是 type 验证一下： print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 打印结果说明结论正确，但这就奇怪了，type 的父类是 object，而 object 的类型又是 type，那么问题来了，是先有 type 还是先有 object 呢？带着这些疑问，开始下面的内容。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 楔子","id":"21","title":"楔子"},"210":{"body":"本篇文章来聊一聊集合支持的操作，比如元素的添加、删除，以及集合的扩容等等。并且集合还支持交集、并集、差集等运算，它们又是如何实现的呢？下面就一起来看一看。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 楔子","id":"210","title":"楔子"},"211":{"body":"调用 add 方法可以向集合添加一个元素，在底层会执行 set_add 函数。 // Objects/setobject.c\nstatic PyObject *\nset_add(PySetObject *so, PyObject *key)\n{ // 调用了 set_add_key 函数 if (set_add_key(so, key)) return NULL; // 返回 None Py_RETURN_NONE;\n} static int\nset_add_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值，由于字符串内部会缓存自身的哈希值，因此需要判断一下 // 如果 key 不是字符串，或者 key 是字符串、但哈希值为 -1（尚未计算过） // 那么计算哈希值，但如果计算之后的结果是 -1，说明对象不支持哈希 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_add_entry return set_add_entry(so, key, hash);\n} 假设有一个集合 so，那么 so.add(\"abc\") 最终等价于 set_add_entry(so, \"abc\", hash(\"abc\"))，所以核心逻辑位于 set_add_entry 里面，看一下它的实现，代码比较长。 // Objects/setobject.c\nstatic int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *freeslot; setentry *entry; size_t perturb; size_t mask; size_t i; size_t j; int cmp; // 增加 key 的引用计数，当然这里的 key 指的就是集合的元素 Py_INCREF(key); restart: // mask 等于哈希表的容量减 1 mask = so->mask; // 和字典一样，让 hash & mask 计算出一个索引 i = (size_t)hash & mask; // 获取对应的 entry，里面包含了元素 key 和哈希值 // 如果 key == NULL，说明该位置还没有存储元素 // 此时就找到了合适的位置，跳转到 found_unused 标签 entry = &so->table[i]; if (entry->key == NULL) goto found_unused; freeslot = NULL; // perturb 初始等于哈希值 perturb = hash; while (1) { // 到这里说明指定的位置已经存储了元素，那么判断哈希值是否相同 // 如果哈希值不同，那么 key 一定不相同 // 如果哈希值相同，那么 key 不一定相同 if (entry->hash == hash) { // 所以当哈希值相等时，还要比较新添加的 key 和已存在的 key 是否相同 PyObject *startkey = entry->key; assert(startkey != dummy); 、// 这里的 startkey 和 key 都是 C 的变量，它们都是指针 // 如果两者相等，说明指向的是同一个对象，那么直接判定为相等，于是跳转到 found_active 标签 if (startkey == key) // 相当于 Python 的 is goto found_active; // 如果 startkey 和 key 不等，说明指向的不是同一个对象 // 那么比较值是否相等，相当于 Python 的 == // 这里是针对字符串的一个快分支 if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); // 如果 key 不是字符串，则执行通用比较逻辑 cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); // cmp > 0，说明结果为真，即两个 key 的值相等 // 跳转到 found_active 标签 if (cmp > 0) goto found_active; // cmp < 0 表示执行比较操作时出现错误，基本不会发生 if (cmp < 0) goto comparison_error; // 到这里说明两个 key 虽然映射出的索引是一样的，但它们的值不相等 // 那么要怎么办呢？显然要看下一个 entry 是否可用 // 然后下面这三行代码估计让人有些费解，所做的事情如下 // 如果在查询的过程中，哈希表扩容了，或者 key 发生了改变，那么跳转到 restart 标签重新执行 // 但因为 GIL 的存在，实际不会发生 if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } /* 如果是 Unused 态的 entry，那么 * entry->key == NULL * entry->hash == 0 * * 如果是 Dummy 态的 entry，那么 * entry->key == dummy * entry->hash == -1 * * 如果是 Active 态的 entry，那么 * entry->key == some key * entry->hash == some hash */ // 说明 entry 处于 dummy 态，将它赋值给 freeslot else if (entry->hash == -1) freeslot = entry; // 关于这一步是做什么的，一会儿解释 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // 到这里说明 (&so->table[i])->key 和添加的 key 不相等，即出现了索引冲突 // 那么要改变规则，重新映射，直到映射出一个可用的位置 perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) goto found_unused_or_dummy; } found_unused_or_dummy: // 如果 freeslot == NULL，说明没有撞上 Dummy 态的 entry // 跳转到 found_unused 标签 if (freeslot == NULL) goto found_unused; // 否则说明撞上了 Dummy 态的 entry // 集合的长度加 1，或者说 Active 态的 entry 个数加 1 so->used++; // 更新 key 和 hash freeslot->key = key; freeslot->hash = hash; return 0; found_unused: // 执行到这里，说明找到了新的可用位置 // 那么不光 used 要加 1，fill 也要加 1 so->fill++; so->used++; // 更新 key 和 hash entry->key = key; entry->hash = hash; // 如果哈希表的 entry 的个数（Active 态 + Dummy 态）没超过 mask * 3 / 5 // 那么目前的容量是合理的，直接返回 if ((size_t)so->fill*5 < mask*3) return 0; // 否则进行扩容，因为扩容的时候会丢弃 Dummy 的 entry // 所以扩容之后的容量取决于 used，而不是 fill // 如果 used 大于 50000，那么 2 倍扩容，否则 4 倍扩容 return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4); found_active: // 执行到这里，说明添加的元素已经存在了 // 那么减少 key 的引用计数，然后返回 Py_DECREF(key); return 0; comparison_error: // 执行比较操作时出现错误，应该抛出异常，但这一步基本不会发生 Py_DECREF(key); return -1;\n} 所以整个过程和字典是类似的，依旧是将哈希值和 mask 按位与，得到索引，通过索引找到对应的 entry。接下来对 entry 分情况讨论。 如果 entry->key == NULL。 说明找到了可用的 entry，那么直接跳转到 found_unused 标签，然后修改 entry 的 key 和 hash 字段，这样新元素就添加成功了。 如果 entry->hash == hash。 说明找到的 entry 处于 Active 态，那么比较两个 key 是否相等。如果相等，证明添加的元素已存在，则不插入，直接减少引用计数，因为不是字典，不存在更新一说。但如果两个 key 不相等，说明出现索引冲突，那么要映射出一个新的索引，并且映射的方式和字典也是一样的。 perturb >>= PERTURB_SHIFT;\ni = (i * 5 + 1 + perturb) & mask; 但字典和集合有一处不同，就是集合这里多了一个 for 循环。 // Objects/setobject.c\n#define LINEAR_PROBES 9 static int\nset_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ // ... while (1) { // ... // 当前映射出的索引为 i，如果 i + 9 没有超过 mask，那么循环 9 次 if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) goto found_unused_or_dummy; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) goto found_active; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) goto found_active; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp > 0) goto found_active; if (cmp < 0) goto comparison_error; if (table != so->table || entry->key != startkey) goto restart; mask = so->mask; } else if (entry->hash == -1) freeslot = entry; } } // ... } // ...\n} 当映射出的索引相同、但 key 不相同时，说明出现了索引冲突，对于字典来说，会立即重新映射，找到一个新的索引。而集合由于只用一个数组存储，可以有更好的做法。我们知道 CPU 是有缓存的，像 L1 Cache 加载数据会一次性加载 64 字节，称为一个 cache line。所以通过索引遍历包含 16 个 int32 的数组，每次 i++ 和每次 i += 4 的耗时是差不多的。 对于集合来说，因为映射出的索引是随机的，使得对应的 entry 可能不在 cache 中，从而导致 CPU 下一次要重新读取。所以 Python 引入了 LINEAR_PROBES，从当前的 entry 开始，向后查找 9 个 entry。如果还找不到可用位置，然后才重新计算，从而提高 cache 的稳定性。 如果 entry->hash == -1，或者说 entry->key == dummy。 说明撞上了一个 Dummy 态的 entry，但估计有人又注意到了一个问题。 就是在发现 Dummy 态的 entry 之后，为啥没有立即跳转到 found_unused_or_dummy 标签，而是要继续循环呢？ 很简单，我们假设在发现 Dummy 态的 entry 之后立即跳转，看看会有什么后果。首先向集合添加一个元素 x，再添加一个元素 y，但 y 和 x 映射出的索引相同，那么在添加 y 的时候，会形成一条探测链，对应的元素就是 x->y。然后再将 x 删除，那么 x->y 就变成了 dummy->y。这时候如果再重新添加一个元素 y，那么肯定会撞上 Dummy 态的 entry，于是 dummy->y 就变成了 y->y。 所以当发现 Dummy 态的 entry 之后，如果立即跳转，就会无法消除集合的重复元素。因此正确的做法是先用变量保存起来，这里赋值给了 freeslot，然后继续查找。如果找到了相同的元素，那么就不添加了，因为集合中的元素是唯一的。但如果最后找到的 entry 的 key 为空，说明元素不存在，此时才能跳转到 found_unused_or_dummy 标签，然后对 freeslot 进行判断。如果不为空，说明撞上了 Dummy 态的 entry，那么直接复用该 entry 即可。 以上就是集合添加元素的过程，当然如果找到的是 Unused 态的 entry，还要判断容量的问题。如果 Active 态 + Dummy 态的 entry 个数不小于 3/5*mask，那么扩容，扩容的规则是判断 Active 态的 entry 个数是否大于 50000，是的话就 2 倍扩容，否则 4 倍扩容；","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » add 方法：添加元素","id":"211","title":"add 方法：添加元素"},"212":{"body":"调用 pop 方法，可以从集合中弹出一个元素，在底层会执行 set_pop 方法。 // Objects/setobject.c static PyObject *\nset_pop(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ // so->table 是指向 entry 数组首元素的指针 // so->finger 是做什么的，稍后解释，总之它是一个整数 // so->mask 等于 entry 数组的长度减 1，用于将取模运算优化成按位与运算 // 因此 so->finger & so->mask 会得到一个 0 ~ mask 之间的整数，我们记为 n // 显然这里的变量 entry 会指向 entry 数组中索引 n 的元素 setentry *entry = so->table + (so->finger & so->mask); // 变量 limit 则指向 entry 数组中最后一个元素（索引为 mask） setentry *limit = so->table + so->mask; PyObject *key; // 如果集合长度为 0，那么 pop 方法会抛出 KeyError if (so->used == 0) { PyErr_SetString(PyExc_KeyError, \"pop from an empty set\"); return NULL; } // entry 有三种状态，但显然弹出的 entry 一定是 Active 态 // 所以如果 entry 处于 Unused 或 Dummy 态，直接下一轮循环 while (entry->key == NULL || entry->key==dummy) { entry++; // 我们记 so->finger & so->mask 的结果为 n // 所以相当于从 entry 数组中索引为 n 的位置开始遍历 // 如果遍历到最后一个位置，也没找到 Active 态的 entry，那么从头开始遍历 if (entry > limit) entry = so->table; // 让变量 entry 指向 entry 数组的首元素 // 所以不难发现，整个过程是先遍历 entry 数组中 [n: limit] 的部分 // 如果没有找到 Active 态 entry，那么将 entry 重置为 so->table，从头开始遍历 // 因为执行到这里，说明 so->used 大于 0，即集合的长度大于 0 // 那么当 entry > limit 时，在 entry 数组 [0: n] 的部分，一定存在 Active 态的 entry } // pop 方法会返回弹出的元素，所以获取 entry->key key = entry->key; // 元素被弹出了，对应的 entry 要进行伪删除，所谓的伪删除就是设置一个特殊的墓碑值 // 所以将 entry->key 设置为 dummy，将 entry->hash 设置为 -1 entry->key = dummy; entry->hash = -1; // 集合的长度减 1 so->used--; // 将 finger 更新为被删除的 entry 在 entry 数组中的索引加 1 so->finger = entry - so->table + 1; /* next place to start */ return key;\n} 所以删除的过程还是很简单的，如果不考虑 finger 字段，你就可以简单理解为遍历整个 entry 数组，找到 Active 态的 entry，然后删除即可。只是这么做会导致每次 pop 时，都要重头开始遍历数组。 而当引入了 finger 字段之后，由于该字段初始为 0，所以第一次 pop 时，会从数组的头部开始遍历。假设删除的是数组中索引为 n 的 entry，那么删除之后 finger 字段会被赋值为 n + 1，那么下一次 pop 就会从数组中索引为 n + 1 的 entry 开始遍历。 我们通过 ctypes 来验证这一点： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] class SetEntry(Structure): _fields_ = [ (\"key\", POINTER(PyObject)), (\"hash\", c_longlong) ] class PySetObject(PyObject): _fields_ = [ (\"fill\", c_ssize_t), (\"used\", c_ssize_t), (\"mask\", c_ssize_t), (\"table\", POINTER(SetEntry)), (\"hash\", c_long), (\"finger\", c_ssize_t), (\"smalltable\", (SetEntry * 8)), (\"weakreflist\", POINTER(PyObject)), ] s = {11, 22, 33, 44}\n# 获取 PySetObject 结构体实例\npy_set_obj = PySetObject.from_address(id(s))\n# 遍历 smalltable，打印索引和 key 的哈希值\n# 对于整数来说，它的哈希值等于自身\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 33\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# finger 初始为 0，因此在 pop 元素的时候会从头开始遍历数组\n# 找到第一个 Active 态的 entry\nprint(py_set_obj.finger)\n\"\"\"\n0\n\"\"\" # 显然第一次 pop 出的元素是 33\nprint(s.pop())\n\"\"\"\n33\n\"\"\"\nfor index, entry in enumerate(py_set_obj.smalltable): print(index, entry.hash)\n\"\"\"\n0 0\n1 -1\n2 0\n3 11\n4 44\n5 0\n6 22\n7 0\n\"\"\"\n# 因为被伪删除了\n# 所以索引为 1 的 entry->key 会被设置为 NULL，entry->hash 被设置为 -1\n# 至于 finger 则等于 1 + 1，下一次 pop 时，会从索引为 2 的位置开始遍历\nprint(py_set_obj.finger)\n\"\"\"\n2\n\"\"\" # 那么同理，再次 pop 的时候，会弹出 11，然后 finger 变为 3 + 1 = 4\nprint(s.pop())\n\"\"\"\n11\n\"\"\"\nprint(py_set_obj.finger)\n\"\"\"\n4\n\"\"\" 以上就是 finger 字段的作用，它避免了每次都要从头遍历 entry 数组。从这里也不难发现，当一个集合不断执行 pop 方法，将所有元素依次弹出时，这些元素的顺序和直接遍历 entry 数组拿到的元素的顺序是一致的。 item1 = 22333\nitem2 = 177\nitem3 = 520\nitem4 = 10086\n# 将它们映射成索引，由于是 4 个元素，因此哈希表容量为 8\nindex1 = item1 & 7\nindex2 = item2 & 7\nindex3 = item3 & 7\nindex4 = item4 & 7\nprint(index1, index2, index3, index4)\n\"\"\"\n5 1 0 6\n\"\"\"\n# 所以如果将 item1、item2、item3、item4 放到集合中\n# 不管怎么排列，最终都是下面这个结果\n# item3 会位于 entry 数组中索引为 0 的位置\n# item2 会位于 entry 数组中索引为 1 的位置\n# item1 会位于 entry 数组中索引为 5 的位置\n# item4 会位于 entry 数组中索引为 6 的位置 # 所以不管是弹出元素，还是遍历元素，亦或是直接打印集合\n# 元素顺序一定是 item3、item2、item1、item4\ns1 = {item1, item2, item3, item4}\ns2 = {item2, item1, item4, item3}\ns3 = {item3, item1, item2, item4}\ns4 = {item4, item3, item2, item1}\nprint(s1) # {520, 177, 22333, 10086}\nprint(s2) # {520, 177, 22333, 10086}\nprint(s3) # {520, 177, 22333, 10086}\nprint(s4) # {520, 177, 22333, 10086}\nprint( item3, item2, item1, item4\n) # 520 177 22333 10086 怎么样，是不是对集合又有了更深刻的认识了呢？","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » pop 方法：弹出元素","id":"212","title":"pop 方法：弹出元素"},"213":{"body":"remove 方法可以接收参数，删除集合中指定的元素。除了 remove，还有一个 discard 方法，这两个方法的作用一模一样，都是用来删除指定元素。区别就是当删除的元素不存在时，remove 方法会抛出 KeyError，而 discard 方法不会。 remove 方法在底层对应 set_remove 函数，discard 方法在底层对应 set_discard 函数，而 set_remove 函数只比 set_discard 函数多了一个 if 判断，我们来看一下。 以上是 set_remove 函数，注意图中绿色方框的部分，如果要删除的元素不存在，那么 rv 会等于 DISCARD_NOTFOUND，于是抛出 KeyError。 如果将绿色方框里的 if 逻辑删掉，得到的就是 set_discard 函数的源码。所以这两个函数做的事情是一样的，区别就是 set_remove 会多做一层检测，当删除的元素不存在时，set_remove 会主动抛出一个 KeyError，而 set_discard 函数则什么也不做。 所以这里我们只看 set_remove 函数即可。 // Objects/setobject.c #define DISCARD_NOTFOUND 0\n#define DISCARD_FOUND 1 static PyObject *\nset_remove(PySetObject *so, PyObject *key)\n{ // 要删除的 key，或者说元素 // 当然啦，从 C 的层面来看，删除 key 其实就是删除数组中该 key 对应的 entry // 只不过这个删除是伪删除，即写入一个特殊的墓碑值 PyObject *tmpkey; int rv; // rv 表示删除结果，显然删除逻辑由 set_discard_key 函数实现 // 如果 rv < 0，表示删除元素时出现错误，比如传入了一个不可哈希的对象 // 如果 rv == 0，表示要删除的元素在集合中不存在 // 如果 rv == 1，表示成功将元素从集合中删除 rv = set_discard_key(so, key); if (rv < 0) { // 当传入一个不可哈希对象时，会抛出 TypeError // 我们知道集合也是不可哈希的，但如果要删除的 key 是集合类型 // 那么解释器会额外做一个兜底操作，我们一会儿通过 Python 代码演示 if (!PySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError)) return NULL; // 将回溯栈里的异常清空 PyErr_Clear(); // 基于集合里的元素创建不可变集合 tmpkey = make_new_set(&PyFrozenSet_Type, key); if (tmpkey == NULL) return NULL; // 然后尝试删除这个不可变集合，如果还删除失败，则报错 rv = set_discard_key(so, tmpkey); Py_DECREF(tmpkey); if (rv < 0) return NULL; } // 如果 rv == DISCARD_NOTFOUND，表示要删除的元素不存在 if (rv == DISCARD_NOTFOUND) { _PyErr_SetKeyError(key); // 抛出 KeyError return NULL; } Py_RETURN_NONE;\n} 我们看到当元素删除失败时，如果 key 是集合类型，那么解释器会做一个兜底操作，这是什么意思呢？我们演示一遍。 try: s = {[1, 2, 3]} # 列表不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" try: s = {{1, 2, 3}} # 同样，集合也不可哈希\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'set'\n\"\"\" # 当我们尝试 remove 列表时，依旧会抛出相同的错误\ns = {1, 2, 3}\ntry: s.remove([])\nexcept TypeError as e: print(e)\n\"\"\"\nunhashable type: 'list'\n\"\"\" # 但 remove 一个集合就不同了\ns = { frozenset({1, 2, 3}), frozenset({4, 5, 6}),\n}\n# 不可变集合是可哈希对象，因此它可以放在集合中，也可以被删除\ns.remove(frozenset({1, 2, 3}))\n# 但删除可变集合理论上应该和删除列表一样，抛出 TypeError: unhashable type: 'set'\n# 而事实上异常也确实产生了，保存在回溯栈中，但是从源码中我们看到，解释器会多做一个检测\n# 如果删除的 key 是集合类型，并且栈里的异常是 TypeError，那么将异常清空\n# 然后基于集合创建不可变集合，并尝试删除这个不可变集合\ns.remove({4, 5, 6})\n# 所以这里 s.remove({4, 5, 6}) 等价于 s.remove(frozenset({4, 5, 6}))\nprint(s)\n\"\"\"\nset()\n\"\"\"\n# 我们看到 s 里面的两个不可变集合被删除了 好，我们回到 set_remove 函数，它在删除元素时会调用 set_discard_key 函数，显然删除指定元素的核心逻辑位于此函数中，我们看一下它做了什么。 // Objects/setobject.c static int\nset_discard_key(PySetObject *so, PyObject *key)\n{ Py_hash_t hash; // 计算哈希值 if (!PyUnicode_CheckExact(key) || (hash = ((PyASCIIObject *) key)->hash) == -1) { hash = PyObject_Hash(key); if (hash == -1) return -1; } // 调用 set_discard_entry 函数 // 传入三个参数：集合、要删除的 key、以及 key 的哈希值 return set_discard_entry(so, key, hash);\n} static int\nset_discard_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; PyObject *old_key; // 将 key 映射成索引，并获取该索引对应的 entry 的指针 entry = set_lookkey(so, key, hash); // 因为 entry 数组申请好之后，内部的每个 entry 都拥有一块合法的内存 // 所以指针不可能为 NULL，如果为 NULL，证明内部出问题了 if (entry == NULL) // 基本不会发生 return -1; // 如果 entry->key 为 NULL，证明要删除的 key 不存在，返回 DISCARD_NOTFOUND // 当 set_remove 函数发现返回的是 DISCARD_NOTFOUND，会抛出 KeyError if (entry->key == NULL) return DISCARD_NOTFOUND; // 否则说明 key 存在 old_key = entry->key; // 因为被删除了，所以将 entry->key、entry->hash 设置为 dummy 和 -1 entry->key = dummy; entry->hash = -1; // 集合长度减 1 so->used--; // 减少 key 指向对象的引用计数，因为集合不再持有对它的引用 Py_DECREF(old_key); // 返回 DISCARD_FOUND return DISCARD_FOUND;\n} 以上就是 set_remove 函数删除指定元素的具体细节，逻辑并不复杂。但是里面出现了一个 set_lookkey 函数，它的作用是将哈希值映射成索引，并返回指定的 entry。至于该函数的逻辑也很简单，它和 set_add 函数里面的逻辑是重复的。 static setentry *\nset_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *table; setentry *entry; size_t perturb; size_t mask = so->mask; size_t i = (size_t)hash & mask; /* Unsigned for defined overflow behavior */ size_t j; int cmp; entry = &so->table[i]; if (entry->key == NULL) return entry; perturb = hash; while (1) { if (entry->hash == hash) { PyObject *startkey = entry->key; /* startkey cannot be a dummy because the dummy hash field is -1 */ assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) /* unlikely */ return NULL; if (table != so->table || entry->key != startkey) /* unlikely */ return set_lookkey(so, key, hash); if (cmp > 0) /* likely */ return entry; mask = so->mask; /* help avoid a register spill */ } if (i + LINEAR_PROBES <= mask) { for (j = 0 ; j < LINEAR_PROBES ; j++) { entry++; if (entry->hash == 0 && entry->key == NULL) return entry; if (entry->hash == hash) { PyObject *startkey = entry->key; assert(startkey != dummy); if (startkey == key) return entry; if (PyUnicode_CheckExact(startkey) && PyUnicode_CheckExact(key) && _PyUnicode_EQ(startkey, key)) return entry; table = so->table; Py_INCREF(startkey); cmp = PyObject_RichCompareBool(startkey, key, Py_EQ); Py_DECREF(startkey); if (cmp < 0) return NULL; if (table != so->table || entry->key != startkey) return set_lookkey(so, key, hash); if (cmp > 0) return entry; mask = so->mask; } } } perturb >>= PERTURB_SHIFT; i = (i * 5 + 1 + perturb) & mask; entry = &so->table[i]; if (entry->key == NULL) return entry; }\n} 显然该函数的逻辑在介绍 set_add 函数的时候就说过了。 如果 entry->key 为空，说明找到了 Unused 态的 entry，即 key 不存在，那么直接将 entry 返回即可。 如果 entry->key 不为空，那么比较 entry->hash 和传入的 hash 是否相等，如果哈希值不相等，那么 key 一定不相等，说明出现了索引冲突。当然啦，如果 entry 处于 Dummy 态，那么哈希值肯定也不相等，但不管哪一种，都要重新映射。 如果哈希值相等，那么比较 key 是否相等，如果 key 相等，说明查找的 key 存在于集合中，那么返回对应的 entry。如果 key 不相等，则重新映射。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » remove 方法：删除指定元素","id":"213","title":"remove 方法：删除指定元素"},"214":{"body":"调用 copy 方法可以拷贝一个集合，在底层会执行 set_copy 方法。 // Objects/setobject.c static PyObject *\nset_copy(PySetObject *so, PyObject *Py_UNUSED(ignored))\n{ return make_new_set_basetype(Py_TYPE(so), (PyObject *)so);\n} static PyObject *\nmake_new_set_basetype(PyTypeObject *type, PyObject *iterable)\n{ if (type != &PySet_Type && type != &PyFrozenSet_Type) { if (PyType_IsSubtype(type, &PySet_Type)) type = &PySet_Type; else type = &PyFrozenSet_Type; } return make_new_set(type, iterable);\n} static PyObject *\nmake_new_set(PyTypeObject *type, PyObject *iterable)\n{ PySetObject *so; // 为集合申请内存 so = (PySetObject *)type->tp_alloc(type, 0); if (so == NULL) return NULL; // 字段初始化，显然刚创建的集合的容量为 8 so->fill = 0; so->used = 0; so->mask = PySet_MINSIZE - 1; so->table = so->smalltable; so->hash = -1; so->finger = 0; so->weakreflist = NULL; // 调用 set_update_internal 函数，将可迭代对象的元素添加到集合中 if (iterable != NULL) { if (set_update_internal(so, iterable)) { Py_DECREF(so); return NULL; } } return (PyObject *)so;\n} static int\nset_update_internal(PySetObject *so, PyObject *other)\n{ // 参数 so 表示集合，other 表示可迭代对象 PyObject *key, *it; // 如果 other 的类型也是集合（或者不可变集合），那么调用 set_merge 函数 if (PyAnySet_Check(other)) return set_merge(so, other); // 否则检测 other 是否为字典 if (PyDict_CheckExact(other)) { PyObject *value; Py_ssize_t pos = 0; Py_hash_t hash; Py_ssize_t dictsize = PyDict_GET_SIZE(other); // 判断 so->fill + dictsize 是否达到了 so->mask 的 3/5 // 如果达到了，那么扩容 if (dictsize < 0) return -1; if ((so->fill + dictsize)*5 >= so->mask*3) { if (set_table_resize(so, (so->used + dictsize)*2) != 0) return -1; } // 遍历字典，将字典的 key 和 hash 包装成 entry，添加到数组中，value 丢弃 // 这里调用的是 set_add_entry 函数，我们介绍集合的 add 方法时说过 while (_PyDict_Next(other, &pos, &key, &value, &hash)) { if (set_add_entry(so, key, hash)) return -1; } return 0; } // 到这里说明 other 不是字典，那么迭代出来的整体就是 key // 基于可迭代对象创建迭代器 it = PyObject_GetIter(other); if (it == NULL) return -1; // 将元素迭代出来 while ((key = PyIter_Next(it)) != NULL) { // 调用 set_add_key 函数，它内部会先计算 key 的哈希值 // 然后调用 set_add_entry 函数，添加元素 if (set_add_key(so, key)) { Py_DECREF(it); Py_DECREF(key); return -1; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) return -1; return 0;\n} 以上就是集合的 copy 方法的底层实现，非常简单。说白了就是先创建一个新的集合，然后调用 set_update_internal 函数将老集合里面的元素拷贝过去。当然啦，该函数可以拷贝任意可迭代对象里的元素，不仅仅是集合。只是当可迭代对象是集合时，会单独调用 set_merge 函数，如果不是集合，那么会直接遍历。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » copy 方法：拷贝一个集合","id":"214","title":"copy 方法：拷贝一个集合"},"215":{"body":"调用 update 方法，可以合并多个可迭代对象，举例说明。 s = {1, 2, 3}\ns.update([4, 5, 6], (7, 8, 9))\nprint(s)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" 相信你已经知道底层是怎么做的了，获取每个可迭代对象，然后调用 set_update_internal 函数即可。那么底层是不是这么做的呢？我们来看一下，update 方法在底层对应 set_update 函数。 // Objects/setobject.c static PyObject *\nset_update(PySetObject *so, PyObject *args)\n{ Py_ssize_t i; for (i=0 ; i<PyTuple_GET_SIZE(args) ; i++) { PyObject *other = PyTuple_GET_ITEM(args, i); if (set_update_internal(so, other)) return NULL; } Py_RETURN_NONE;\n} 跟我们分析的一样，非常简单。 另外集合还有一个 union 方法，功能和 update 方法类似，但它会返回一个新的集合。 s1 = {1, 2, 3}\ns1.update([4, 5, 6], (7, 8, 9))\nprint(s1)\n\"\"\"\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" s2 = {1, 2, 3}\ns2_new = s2.union([4, 5, 6], (7, 8, 9))\nprint(s2)\nprint(s2_new)\n\"\"\"\n{1, 2, 3}\n{1, 2, 3, 4, 5, 6, 7, 8, 9}\n\"\"\" update 方法会原地修改，而 union 方法会返回新的集合，不会影响原有的集合。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » update 方法：合并多个可迭代对象","id":"215","title":"update 方法：合并多个可迭代对象"},"216":{"body":"集合还有一些常用的方法，只不过我们更倾向于使用操作符的形式。 s1 & s2：对两个集合做交集运算，返回新的集合，里面包含同时出现在 s1 和 s2 当中的元素； s1 | s2：对两个集合做并集运算，返回新的集合，里面包含出现在 s1 或 s2 当中的元素； s1 - s2：对两个集合做差集运算，返回新的集合，里面包含出现在 s1 当中、但没有出现在 s2 当中的元素； s1 ^ s2：对两个集合做对称差集运算，返回新的集合，里面包含只出现在 s1 当中、或只出现在 s2 当中的元素； s1 == s2：判断两个集合的元素是否完全相同； s1 >= s2：判断 s2 是否是 s1 的子集，如果是，那么 s2 - s1 == {}。 s1 <= s2：判断 s1 是否是 s2 的子集，如果是，那么 s1 - s2 == {}。 s1 > s2：判断 s2 是否是 s1 的真子集； s1 < s2：判断 s1 是否是 s2 的真子集； 注意：在使用这些操作符时，两侧的 s1 和 s2 都要求是集合类型。但如果使用操作符对应的方法，那么则不要求 s2 是集合类型，只要是可迭代对象即可。 # 做交集运算\ns = {\"a\", \"b\", \"c\"}\nprint(s.intersection(\"bcd\"))\n\"\"\"\n{'b', 'c'}\n\"\"\"\n# print(s & \"bcd\") # TypeError 这些方法都非常的有用，可以自己测试一下，加深一遍印象。至于这些方法的底层实现，感兴趣也可以去 Objects/setobject.c 中探索一番，方法都定义在 set_methods 数组中。这里我们就以集合的交集运算为例，看一下实现过程。 // Objects/setobject.c // 判断集合是否包含某个元素\nstatic int\nset_contains_entry(PySetObject *so, PyObject *key, Py_hash_t hash)\n{ setentry *entry; // 调用 set_lookkey，返回 entry // 如果 entry->key 不为空，证明元素存在，否则不存在 entry = set_lookkey(so, key, hash); if (entry != NULL) return entry->key != NULL; return -1;\n} // 两个集合做交集运算，返回新的集合\nstatic PyObject *\nset_intersection(PySetObject *so, PyObject *other)\n{ PySetObject *result; PyObject *key, *it, *tmp; Py_hash_t hash; int rv; // 快分支：如果两个集合相等，那么直接把其中一个拷贝一份 if ((PyObject *)so == other) return set_copy(so, NULL); // 否则创建一个新的空集合 result = (PySetObject *)make_new_set_basetype(Py_TYPE(so), NULL); if (result == NULL) return NULL; // 如果 other 是集合 if (PyAnySet_Check(other)) { Py_ssize_t pos = 0; setentry *entry; // 如果 len(other) > len(so)，那么两者交换位置，也就是遍历元素较少的集合 if (PySet_GET_SIZE(other) > PySet_GET_SIZE(so)) { tmp = (PyObject *)so; so = (PySetObject *)other; other = tmp; } // 遍历集合 other while (set_next((PySetObject *)other, &pos, &entry)) { key = entry->key; hash = entry->hash; // 判断 key 是否存在于集合 so 中 rv = set_contains_entry(so, key, hash); if (rv < 0) { Py_DECREF(result); return NULL; } // 如果存在，那么添加到新集合 result 中 if (rv) { if (set_add_entry(result, key, hash)) { Py_DECREF(result); return NULL; } } } return (PyObject *)result; } // 如果 other 不是集合，那么获取它的迭代器 it = PyObject_GetIter(other); if (it == NULL) { Py_DECREF(result); return NULL; } // 直接迭代内部的元素，以下逻辑和上面类似 while ((key = PyIter_Next(it)) != NULL) { hash = PyObject_Hash(key); if (hash == -1) goto error; // 如果 key 在 so 中存在，那么添加到 result 中 rv = set_contains_entry(so, key, hash); if (rv < 0) goto error; if (rv) { if (set_add_entry(result, key, hash)) goto error; } Py_DECREF(key); } Py_DECREF(it); if (PyErr_Occurred()) { Py_DECREF(result); return NULL; } return (PyObject *)result; error: Py_DECREF(it); Py_DECREF(result); Py_DECREF(key); return NULL;\n} 以上就是集合的交集运算，至于其它的运算操作也是类似的，感兴趣可以看一下。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 其它的一些方法","id":"216","title":"其它的一些方法"},"217":{"body":"关于集合相关的内容我们就介绍完了，当然到目前为止，Python 的内置数据结构也基本介绍完了。回顾一下我们介绍了哪些数据结构： 浮点数； 整数； 复数； 布尔值 None； 切片； bytes 对象； bytearray 对象； 字符串； 列表； 元组； 字典； 集合； 以上这些结构都是内置的，当然还有一些数据结构是定义在标准库里面的，我们后面再说。 下一篇文章来介绍迭代器。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"49. 集合支持的操作有哪些，它们是怎么实现的？ » 小结","id":"217","title":"小结"},"218":{"body":"只要类型对象实现了 __iter__，那么它的实例对象就被称为可迭代对象（Iterable），比如字符串、元组、列表、字典、集合等等。而整数、浮点数，由于其类型对象没有实现 __iter__，所以它们不是可迭代对象。 from typing import Iterable print( isinstance(\"\", Iterable), isinstance((), Iterable), isinstance([], Iterable), isinstance({}, Iterable), isinstance(set(), Iterable),\n) # True True True True True print( isinstance(0, Iterable), isinstance(0.0, Iterable),\n) # False False 可迭代对象的一大特点是可以被 for 循环遍历，但能被 for 循环遍历的则不一定是可迭代对象。我们举个例子： class A: def __getitem__(self, item): return f\"参数 item: {item}\" a = A()\n# 内部定义了 __getitem__\n# 首先可以让实例对象像字典一样访问属性\nprint(a[\"name\"]) # 参数 item: name\nprint(a[\"satori\"]) # 参数 item: satori # 此外还可以像可迭代对象一样被 for 循环\n# 循环的时候会自动给 item 传值：0 1 2 3 ...\n# 如果内部出现了 StopIteration，循环结束\n# 否则会一直循环下去，这里我们手动 break\nfor idx, val in enumerate(a): print(val) if idx == 5: break\n\"\"\"\n参数 item: 0\n参数 item: 1\n参数 item: 2\n参数 item: 3\n参数 item: 4\n参数 item: 5\n\"\"\" 所以实现了 __getitem__ 的类的实例，也是可以被 for 循环的，但它并不是可迭代对象。 from typing import Iterable\nprint(isinstance(a, Iterable)) # False 总之判断一个对象是否是可迭代对象，就看它的类型对象有没有实现 __iter__。可迭代对象我们知道了，那什么是迭代器呢？很简单，调用可迭代对象的 __iter__ 方法，得到的就是迭代器。","breadcrumbs":"50. 迭代器是怎么实现的？ » 楔子","id":"218","title":"楔子"},"219":{"body":"不同类型的对象，都有自己的迭代器，举个栗子。 data = [1, 2, 3]\n# 底层调用的其实是 list.__iter__(data)\n# 或者说 PyList_Type.tp_iter(data)\nit = data.__iter__()\nprint(it)\n\"\"\"\n<list_iterator object at 0x102c1cf10>\n\"\"\"\nprint(str.__iter__(\"\"))\n\"\"\"\n<str_iterator object at 0x100e623b0>\n\"\"\"\nprint(tuple.__iter__(()))\n\"\"\"\n<tuple_iterator object at 0x100e623b0>\n\"\"\"\n# 不难发现，迭代器的种类非常多\n# 比如 list_iterator、str_iterator、tuple_iterator 等等 迭代器也是可迭代对象，只不过迭代器内部的 __iter__ 返回的还是它本身。当然啦，在创建迭代器的时候，我们更常用内置函数 iter。 data = [1, 2, 3]\n# 等价于 type(data).__iter__(data)\nit = iter(data) 但是 iter 函数还有一个鲜为人知的用法，我们来看一下： val = 0 def foo(): global val val += 1 return val # iter 可以接收一个参数: iter(可迭代对象)\n# iter 也可以接收两个参数: iter(可调用对象, value)\nfor i in iter(foo, 5): print(i)\n\"\"\"\n1\n2\n3\n4\n\"\"\" 进行迭代的时候，会不停地调用可调用对象，直到返回值等于传递的第二个参数 value（在底层被称为哨兵），然后终止迭代。我们看一下 iter 函数的底层实现。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *v; // 内置函数 iter 接收 1 ~ 2 个参数 if (!_PyArg_CheckPositional(\"iter\", nargs, 1, 2)) return NULL; // 如果 nargs 等于 1，那么 args[0] 是可迭代对象 // 如果 nargs 等于 2，那么 args[0] 是可调用对象 v = args[0]; // nargs == 1，说明 v 是可迭代对象 if (nargs == 1) // 调用 PyObject_GetIter 获取对象的迭代器 return PyObject_GetIter(v); // 否则说明 nargs == 2，那么 v 是可调用对象 // 这里进行检测，如果不是，抛出 TypeError if (!PyCallable_Check(v)) { PyErr_SetString(PyExc_TypeError, \"iter(v, w): v must be callable\"); return NULL; } // 获取哨兵 PyObject *sentinel = args[1]; // 一会儿单独解释 return PyCallIter_New(v, sentinel);\n} 以上就是 iter 函数的内部逻辑，既可以接收一个参数，也可以接收两个参数。这里我们只看接收一个可迭代对象的情况，所以核心就在 PyObject_GetIter 函数里面，它是根据可迭代对象生成迭代器的关键，我们来看一下它的逻辑是怎样的？ // Objects/abstract.c\nPyObject *\nPyObject_GetIter(PyObject *o)\n{ // 获取可迭代对象的类型对象，比如 o 是列表，那么 t 就是 list PyTypeObject *t = o->ob_type; // 我们说类型对象定义的操作，决定了实例对象的行为 // 实例对象调用的那些方法都是定义在类型对象里面的 // 还是那句话：obj.func() 等价于 type(obj).func(obj) getiterfunc f; // 所以这里是获取类型对象的 tp_iter 字段 // 也就是 Python 中的 __iter__ f = t->tp_iter; // 如果 f 为 NULL，说明类型对象的内部没有定义 __iter__ // 像 str、tuple、list 等类型对象，它们的 tp_iter 字段都是不为 NULL 的 if (f == NULL) { // 如果 tp_iter 为 NULL，那么解释器会退而求其次 // 检测该类型对象中是否定义了 __getitem__ // 如果定义了，那么直接调用 PySeqIter_New，创建 seqiterobject 对象 // 下面的 PySequence_Check 函数负责检测类型对象是否实现了 __getitem__ // __getitem__ 对应 tp_as_sequence->sq_item if (PySequence_Check(o)) return PySeqIter_New(o); // 走到这里说明该类型对象既没有 __iter__、也没有 __getitem__ // 因此它的实例对象不具备可迭代的性质，于是抛出异常 return type_error(\"'%.200s' object is not iterable\", o); } else { // 否则说明定义了 __iter__ // 调用 o->ob_type->tp_iter(o) 返回对应的迭代器 PyObject *res = (*f)(o); // 但如果返回值 res 不为 NULL、并且还不是迭代器 // 证明 __iter__ 的返回值有问题，于是抛出异常 if (res != NULL && !PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, \"iter() returned non-iterator \" \"of type '%.100s'\", res->ob_type->tp_name); Py_DECREF(res); res = NULL; } // 返回 res return res; }\n} 以上便是 iter 函数的底层实现，还是很简单的。然后是里面的 __getitem__，我们说如果类型对象内部没有定义 __iter__，那么解释器会退而求其次，检测内部是否定义了 __getitem__。 因此以上就是迭代器的创建过程，每个可迭代对象都有自己的迭代器，而迭代器本质上就是对原始数据的一层封装罢了。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的创建","id":"219","title":"迭代器的创建"},"22":{"body":"首先必须要澄清一个事实，类对象的类型是 type，这句话是没有问题的。但如果说类对象都是由 type 创建的，就有些争议了。因为 type 能够创建的是自定义的类，而内置的类在底层是预先定义好的。 # int、tuple、dict 等内置类型\n# 在底层是预先定义好的，以全局变量的形式存在\n# 我们直接就可以拿来用\nprint(int) # <class 'int'>\nprint(tuple) # <class 'tuple'> # 但对于自定义的类，显然就需要在运行时动态创建了\n# 而创建这一过程，就交给 type 来做\nclass Girl: pass 然后 type 也只能对自定义类进行属性上的增删改，内置的类则不行。 class Girl: pass # 给类对象增加一个成员函数\ntype.__setattr__( Girl, \"info\", lambda self: \"name: 古明地觉, age: 17\"\n)\n# 实例化之后就可以调用了\nprint(Girl().info()) # name: 古明地觉, age: 17 # 但内置的类对象，type 是无法修改的\ntry: type.__setattr__(int, \"a\", \"b\")\nexcept TypeError as e: print(e)\n\"\"\"\ncan't set attributes of built-in/extension type 'int'\n\"\"\" 上一篇文章中我们说了，Python 所有的类型对象（包括 type）都是由 PyTypeObject 结构体实例化得到的，只不过结构体字段的值不同，得到的类也不同。并且内置的类型对象在底层是预定义好的，它们在解释器看来是同级别的，不存在谁创建谁。 而每一个对象都有引用计数和类型，然后解释器将这些类对象的类型都设置成了 type，我们举例说明。不过在此之前，需要先说一个宏。 // Include/object.h // _PyObject_EXTRA_INIT 可以忽略掉\n// 我们看到这个宏是用来初始化引用计数和类型的\n#define PyObject_HEAD_INIT(type) \\ { _PyObject_EXTRA_INIT \\ 1, type }, // 负责初始化引用计数、类型和 ob_size\n#define PyVarObject_HEAD_INIT(type, size) \\ { PyObject_HEAD_INIT(type) size }, 下面我们来看几个类型对象。 我们看到所有类型对象的类型都被设置成了 &PyType_Type，也就是 Python 里的 type。所以结论很清晰了，虽然内置的类型对象可以看做是 type 的实例对象，但它却不是由 type 实例化得到的，而是在底层预定义好，并以全局变量的形式静态出现。 所以内置的类型对象之间不存在谁创建谁，它们都是预定义好的，只是在定义的时候，将自身的类型设置成了 type 而已，包括 type 本身（类型还是 type）。这样一来，每一个对象都会有一个类型，从而将面向对象理念贯彻的更加彻底。 print(int.__class__)\nprint(tuple.__class__)\nprint(set.__class__)\nprint(type.__class__)\n\"\"\"\n<class 'type'>\n<class 'type'>\n<class 'type'>\n<class 'type'>\n\"\"\" print( type.__class__.__class__.__class__ is type\n) # True print( type(type(type(type(type(type))))) is type\n) # True 好，说完了这些之后我们来正式考察 type 和 object 的底层实现。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类是由谁创建的","id":"22","title":"类是由谁创建的"},"220":{"body":"由于迭代器的种类非常多，字符串、元组、列表等等，都有自己的迭代器，这里就不一一介绍了。我们就以列表的迭代器为例，看看迭代器在底层的结构是怎么样的。 // Objects/listobject.c // 列表迭代器的类型对象为 <class 'list_iterator'>\n// 但这个类，解释器并没有暴露给我们，所以需要通过 type 获取\n// 然后它的 tp_basicsize 字段为 sizeof(listiterobject)\n// 这就说明列表迭代器在底层由 listiterobject 结构体表示\nPyTypeObject PyListIter_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"list_iterator\", /* tp_name */ sizeof(listiterobject), /* tp_basicsize */ 0, /* tp_itemsize */ // ...\n}; typedef struct { PyObject_HEAD Py_ssize_t it_index; // 指向创建该迭代器的列表 PyListObject *it_seq;\n} listiterobject; 所以迭代器就是基于可迭代对象进行了一层简单的封装，所谓元素迭代本质上还是基于索引，并且每迭代一次，索引就自增 1。一旦出现索引越界，就将 it_seq 设置为 NULL，表示迭代器迭代完毕。 我们实际演示一下： from ctypes import * class PyObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_size\", c_void_p) ] class ListIterObject(PyObject): _fields_ = [ (\"it_index\", c_ssize_t), (\"it_seq\", POINTER(PyObject)) ] it = iter([1, 2, 3])\nit_obj = ListIterObject.from_address(id(it)) # it_seq 指向列表 [1, 2, 3]，it_index 初始为 0\nprint(it_obj.it_index) # 0\n# 进行迭代\nnext(it)\n# 索引自增 1，此时 it_index 等于 1\nprint(it_obj.it_index) # 1\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 2\nprint(it_obj.it_index) # 2\n# 再次迭代\nnext(it)\n# 此时 it_index 等于 3\nprint(it_obj.it_index) # 3 当 it_index 为 3 的时候，如果再次迭代，那么底层会发现 it_index 已超过最大索引，于是知道迭代器已经迭代完毕了。因此会将 it_seq 设置为 NULL，并抛出 StopIteration。如果是 for 循环，那么会自动捕获此异常，然后停止循环。 所以这就是迭代器，真的没有想象中的那么神秘，甚至在知道它的实现原理之后，还觉得有点 low，因为就是将原始数据包了一层，加了一个索引而已。所谓的迭代仍然是基于索引来做的，并且每迭代一次，索引就自增 1。当索引超出范围时，证明迭代完毕了，于是将 it_seq 字段设置为 NULL，抛出 StopIteration。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器的底层结构","id":"220","title":"迭代器的底层结构"},"221":{"body":"迭代器的创建我们知道了，那么它是怎么迭代元素的呢？首先迭代元素可以通过 next 函数，当然它本质上也是调用了对象的 __next__ 方法。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_next(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ PyObject *it, *res; // 同样接收 1 ~ 2 个参数 // 因为调用 next 函数时，可以传入一个默认值 // 表示当迭代器没有元素可以迭代的时候，会返回指定的默认值 if (!_PyArg_CheckPositional(\"next\", nargs, 1, 2)) return NULL; // 迭代器 it = args[0]; // 类型检测，如果不是迭代器，那么抛出异常 if (!PyIter_Check(it)) { PyErr_Format(PyExc_TypeError, \"'%.200s' object is not an iterator\", it->ob_type->tp_name); return NULL; } // it->ob_type 表示获取类型对象，也就是该迭代器的类型 // 当然具体类型是哪一种并不确定，可能是列表迭代器、元组迭代器、字符串迭代器等等 // 然后再获取 tp_iternext 字段，相当于 __next__ // 拿到函数指针之后，传入迭代器进行调用 res = (*it->ob_type->tp_iternext)(it); // 如果 res 不为 NULL，那么证明迭代到值了，直接返回 if (res != NULL) { return res; } else if (nargs > 1) { // 否则的话，说明没有迭代到值（返回 NULL），而这时候有两种情况 // 1）迭代器已耗尽，2）在迭代过程中出现异常 // 那么判断 nargs 是否大于 1，如果大于 1，说明设置了默认值 PyObject *def = args[1]; // 检测异常是不是迭代完毕时（或者手动 raise）产生的 StopIteration 异常 if (PyErr_Occurred()) { if(!PyErr_ExceptionMatches(PyExc_StopIteration)) // 如果不是，说明程序的逻辑有问题，直接 return NULL，结束执行 // 然后在 Python 里面我们会看到打印到 stderr 中的异常信息 return NULL; // 如果异常是 StopIteration，证明迭代完毕了 // 但我们设置了默认值，那么就应该返回默认值 // 而不应该抛出 StopIteration，于是将异常回溯栈给清空 PyErr_Clear(); } // 增加默认值的引用计数，然后返回 Py_INCREF(def); return def; } else if (PyErr_Occurred()) { // 走到这里说明 res == NULL，并且没有指定默认值 // 那么当发生异常时，将异常直接抛出 return NULL; } else { // 都不是的话，直接抛出 StopIteration PyErr_SetNone(PyExc_StopIteration); return NULL; }\n} 以上就是 next 函数的背后逻辑，实际上还是调用了迭代器的 __next__ 方法。 data = [1, 2, 3]\nit = iter(data)\n# 然后迭代，等价于 next(it)\nprint(type(it).__next__(it)) # 1\nprint(type(it).__next__(it)) # 2\nprint(type(it).__next__(it)) # 3\n# 但是 next 可以指定默认值\n# 如果不指定默认值，或者还是 type(it).__next__(it)\n# 那么就会报错，抛出 StopIteration\nprint(next(it, 666)) # 666 以上就是元素的迭代，由于内置函数 next 还可以指定一个默认值，所以更强大一些。当然在不指定默认值的情况下，next(it) 和 type(it).__next__(it) 最终是殊途同归的。 我们仍以列表的迭代器为例，看看 __next__ 的具体实现。 由于 tp_iternext 字段指向了 listiter_next，证明迭代的时候调用的是这个函数。 // Objects/listobject.c\nstatic PyObject *\nlistiter_next(listiterobject *it)\n{ // 迭代器只是对可迭代对象的一层封装 // 如果是列表的迭代器，那么内部的 it_seq 字段便指向列表 PyListObject *seq; PyObject *item; assert(it != NULL); // 如果 it->it_seq 等于 NULL，说明迭代器已经迭代完毕了 // 从这里也能看出迭代器不能二次循环迭代 seq = it->it_seq; if (seq == NULL) return NULL; assert(PyList_Check(seq)); // 如果 it->it_index 小于列表的长度 if (it->it_index < PyList_GET_SIZE(seq)) { // 那么获取元素 item = PyList_GET_ITEM(seq, it->it_index); // it_index 自增 1 ++it->it_index; // 增加元素的引用计数，并返回 Py_INCREF(item); return item; } // 否则说明 it_index 已经达到了列表的长度 // 再迭代就索引越界了，而对于迭代器来说 // 当 it_index 等于列表长度时，就证明所有元素都迭代完毕了 it->it_seq = NULL; // 将 it_seq 设置为 NULL Py_DECREF(seq); return NULL;\n} 显然这和之前分析的是一样的，以上我们就以列表为例，考察了迭代器的实现原理和元素迭代的具体过程。当然其它对象也有自己的迭代器，有兴趣可以看一看，实现方式都大同小异。","breadcrumbs":"50. 迭代器是怎么实现的？ » 迭代器是怎么迭代元素的","id":"221","title":"迭代器是怎么迭代元素的"},"222":{"body":"前面说了，iter 函数如果接收一个参数，那么这个参数必须是可迭代对象。如果接收两个参数，那么第一个参数要是 callable，第二个参数是哨兵。迭代时会调用 callable，当返回值等于哨兵时，迭代结束，那么它的底层是怎么实现的呢？这里简单补充一下。 // Python/bltinmodule.c\nstatic PyObject *\nbuiltin_iter(PyObject *self, PyObject *const *args, Py_ssize_t nargs)\n{ // ... PyObject *sentinel = args[1]; // 如果参数个数等于 2，会调用 PyCallIter_New return PyCallIter_New(v, sentinel);\n} // Objects/iterobject.c\ntypedef struct { PyObject_HEAD PyObject *it_callable; PyObject *it_sentinel;\n} calliterobject; PyObject *\nPyCallIter_New(PyObject *callable, PyObject *sentinel)\n{ // iter(callable, value) 会返回一个 <class 'callable_iterator'> 实例 // 在底层由 calliterobject 结构体实现 calliterobject *it; // 为 calliterobject 实例申请内存 it = PyObject_GC_New(calliterobject, &PyCallIter_Type); if (it == NULL) return NULL; // 初始化字段 Py_INCREF(callable); it->it_callable = callable; Py_INCREF(sentinel); it->it_sentinel = sentinel; _PyObject_GC_TRACK(it); return (PyObject *)it;\n} // 再来看看迭代过程\nstatic PyObject *\ncalliter_iternext(calliterobject *it)\n{ PyObject *result; // 如果 it_callable 字段为空，说明迭代结束，不能再次迭代 if (it->it_callable == NULL) { return NULL; } // 调用 it_callable，拿到返回值 result result = _PyObject_CallNoArg(it->it_callable); if (result != NULL) { int ok; // 如果 result 和哨兵相等，那么 ok == 1，否则 ok == 0 ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ); // ok == 0，说明两者不相等，那么返回 result if (ok == 0) { return result; } // ok > 0，说明返回值和哨兵相等，那么迭代结束 // 减少引用计数，并将 it_callable 和 it_sentinel 字段设置为 NULL Py_DECREF(result); if (ok > 0) { Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } } else if (PyErr_ExceptionMatches(PyExc_StopIteration)) { // 如果函数抛出了 StopIteration 异常，同样视为迭代结束 PyErr_Clear(); Py_CLEAR(it->it_callable); Py_CLEAR(it->it_sentinel); } return NULL;\n} 还是比较简单的，就是不停地调用可迭代对象，当返回值和哨兵相等时，迭代结束。","breadcrumbs":"50. 迭代器是怎么实现的？ » iter 函数接收两个参数","id":"222","title":"iter 函数接收两个参数"},"223":{"body":"通过探究迭代器，我们再次体会到了 Python 的设计哲学，虽然一切皆对象，但是拿到的都是对象的指针。像变量、函数参数等，它们存储的都不是对象本身，而是对象的泛型指针。而基于 PyObject * 和 ob_type，Python 巧妙地实现了多态。 不管变量 obj 指向什么样的可迭代对象，都可以交给 iter 函数，会调用类型对象内部的 __iter__（底层对应 tp_iter 字段），得到迭代器。不管变量 it 指向什么样的迭代器，都可以交给 next 函数进行迭代，会调用迭代器的类型对象的 __next__（底层对应 tp_iternext 字段），将值迭代出来。 至于 __iter__ 和 __next__ 本身，每个迭代器都会有，我们这里只以列表的迭代器为例。所以这是不是实现了多态呢？ 这就是 Python 的设计哲学，变量只是一个指针，传递变量的时候相当于传递指针（将指针拷贝一份），但操作一个变量的时候会自动操作变量（指针）指向的内存。 以上就是 Python 迭代器的相关内容，当然你也完全可以自己封装一个迭代器，有兴趣可以试一下。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"50. 迭代器是怎么实现的？ » 小结","id":"223","title":"小结"},"224":{"body":"当我们执行一个 py 文件的时候，只需要在命令行中输入 python xxx.py 即可，但你有没有想过这背后的流程是怎样的呢？ 首先 py 文件不是一上来就直接执行的，而是会先有一个编译的过程，整个步骤如下： 这里我们看到了 Python 编译器、Python 虚拟机，而且我们平常还会说 Python 解释器，那么三者之间有什么区别呢？ Python 编译器负责将 Python 源代码编译成 PyCodeObject 对象，然后交给 Python 虚拟机来执行。 那么 Python 编译器和 Python 虚拟机都在什么地方呢？如果打开 Python 的安装目录，会发现有一个 python.exe，点击的时候会通过它来启动一个终端。但问题是这个文件大小还不到 100K，不可能容纳一个编译器加一个虚拟机，所以它下面还有一个 python38.dll。没错，编译器、虚拟机都藏身于 python38.dll 当中。 因此 Python 虽然是解释型语言，但也有编译的过程。源代码会被编译器编译成 PyCodeObject 对象，然后再交给虚拟机来执行。而之所以要存在编译，是为了让虚拟机能更快速地执行，比如在编译阶段常量都会提前分配好，而且还可以尽早检测出语法上的错误。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 楔子","id":"224","title":"楔子"},"225":{"body":"在 Python 开发时，我们肯定都见过这个 pyc 文件，它一般位于 __pycache__ 目录中，那么 pyc 文件和 PyCodeObject 之间有什么关系呢？ 首先我们都知道字节码，虚拟机的执行实际上就是对字节码不断解析的一个过程。然而除了字节码之外，还应该包含一些其它的信息，这些信息也是 Python 运行的时候所必需的，比如常量、变量名等等。 因此我们常听到 py 文件被编译成字节码，这句话其实不太严谨，因为字节码只是一个 PyBytesObject 对象、或者说一段字节序列。但很明显，光有字节码是不够的，还有很多的静态信息也需要被收集起来，它们整体被称为 PyCodeObject，然后 PyCodeObject 对象中有一个字段 co_code，它是一个指针，指向了这段字节序列。但是这个对象除了有指向字节码的 co_code 字段之外，还有很多其它字段，负责保存代码涉及到的常量、变量（名字、符号）等等。 所以虽然编写的是 py 文件，但虚拟机执行的是编译后的 PyCodeObject 对象。但是问题来了，难道每一次执行都要将源文件编译一遍吗？如果没有对源文件进行修改的话，那么完全可以使用上一次的编译结果。相信此时你能猜到 pyc 文件是干什么的了，它就是负责保存编译之后的 PyCodeObject 对象。 现在我们知道了，pyc 文件里面保存的内容是 PyCodeObject 对象。对于 Python 编译器来说，PyCodeObject 对象是对源代码编译之后的结果，而 pyc 文件则是这个对象在硬盘上的表现形式。 当下一次运行的时候，Python 解释器会根据 pyc 文件中记录的编译结果，直接建立内存中的 PyCodeObject 对象，而不需要再重新编译了，当然前提是没有对源文件进行修改。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » pyc 文件是什么","id":"225","title":"pyc 文件是什么"},"226":{"body":"既然 PyCodeObject 对象是源代码的编译结果，那么搞清楚它的底层结构就至关重要，下面来看一下它长什么样子。 // Include/cpython/code.h typedef struct { PyObject_HEAD int co_argcount; int co_posonlyargcount; int co_kwonlyargcount; int co_nlocals; int co_stacksize; int co_flags; int co_firstlineno; PyObject *co_code; PyObject *co_consts; PyObject *co_names; PyObject *co_varnames; PyObject *co_freevars; PyObject *co_cellvars; Py_ssize_t *co_cell2arg; PyObject *co_filename; PyObject *co_name; PyObject *co_lnotab; void *co_zombieframe; PyObject *co_weakreflist; void *co_extra; unsigned char *co_opcache_map; _PyOpcache *co_opcache; int co_opcache_flag; unsigned char co_opcache_size;\n} PyCodeObject; 这里面的每一个字段，我们一会儿都会详细介绍，并通过代码逐一演示。总之 Python 编译器在对源代码进行编译的时候，针对每一个 code block（代码块），都会创建一个 PyCodeObject 与之对应。但多少代码才算得上是一个 block 呢？事实上，Python 有一个简单而清晰的规则：当进入一个新的名字空间，或者说作用域时，就算是进入一个新的 block 了。举个例子： class A: a = 123 def foo(): a = [] 我们仔细观察一下上面这段代码，它在编译完之后会有三个 PyCodeObject 对象，一个是对应整个 py 文件（模块）的，一个是对应 class A 的，一个是对应 def foo 的。因为这是三个不同的作用域，所以会有三个 PyCodeObject 对象。 所以一个 code block 对应一个作用域、同时也对应一个 PyCodeObject 对象。Python 的类、函数、模块都有自己独立的作用域，因此在编译时也都会有一个 PyCodeObject 对象与之对应。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 底层结构","id":"226","title":"PyCodeObject 底层结构"},"227":{"body":"PyCodeObject 我们知道它是干什么的了，那如何才能拿到这个对象呢？首先该对象在 Python 里面的类型是 <class 'code'>，但是底层没有将这个类暴露给我们，因此 code 这个名字在 Python 里面只是一个没有定义的变量罢了。 但我们可以通过其它的方式进行获取，比如函数。 def func(): pass print(func.__code__) # <code object ......\nprint(type(func.__code__)) # <class 'code'> 我们可以通过函数的 __code__ 属性拿到底层对应的 PyCodeObject 对象，当然也可以获取里面的字段，下面就来演示一下，并详细介绍每个字段的含义。 PyObject_HEAD：对象的头部信息 我们看到 Python 真的一切皆对象，源代码编译之后的结果也是一个对象。 co_argcount：可以通过位置参数传递的参数个数 def foo(a, b, c=3): pass\nprint(foo.__code__.co_argcount) # 3 def bar(a, b, *args): pass\nprint(bar.__code__.co_argcount) # 2 def func(a, b, *args, c): pass\nprint(func.__code__.co_argcount) # 2 函数 foo 中的参数 a、b、c 都可以通过位置参数传递，所以结果是 3。而函数 bar 则是两个，这里不包括 *args。最后函数 func 显然也是两个，因为参数 c 只能通过关键字参数传递。 co_posonlyargcount：只能通过位置参数传递的参数个数，Python3.8 新增 def foo(a, b, c): pass\nprint(foo.__code__.co_posonlyargcount) # 0 def bar(a, b, /, c): pass\nprint(bar.__code__.co_posonlyargcount) # 2 注意：这里是只能通过位置参数传递的参数个数。对于 foo 而言，里面的三个参数既可以通过位置参数、也可以通过关键字参数传递，所以个数是 0。而函数 bar，里面的 a、b 只能通过位置参数传递，所以个数是 2。 co_kwonlyargcount：只能通过关键字参数传递的参数个数 def foo(a, b=1, c=2, *, d, e): pass\nprint(foo.__code__.co_kwonlyargcount) # 2 这里是 d 和 e，它们必须通过关键字参数传递。 co_nlocals：代码块中局部变量的个数，也包括参数 def foo(a, b, *args, c, **kwargs): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'args', 'kwargs', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_nlocals)\n\"\"\"\n8\n\"\"\" co_varnames 保存的是代码块的局部变量，显然 co_nlocals 就是它的长度。并且我们看到在编译之后，函数的局部变量就已经确定了，因为它们是静态存储的。 co_stacksize：执行该段代码块所需要的栈空间 def foo(a, b, c): name = \"xxx\" age = 16 gender = \"f\" c = 33 print(foo.__code__.co_stacksize) # 1 这个暂时不需要太关注，后续介绍栈帧的时候会详细说明。 co_flags：函数标识 先来提出一个问题： def some_func(): return \"hello world\" def some_gen(): yield return \"hello world\" print(some_func.__class__)\nprint(some_gen.__class__)\n\"\"\"\n<class 'function'>\n<class 'function'>\n\"\"\" print(some_func())\n\"\"\"\nhello world\n\"\"\"\nprint(some_gen())\n\"\"\"\n<generator object some_gen at 0x1028a80b0>\n\"\"\" 调用 some_func 会将代码执行完毕，调用 some_gen 会返回生成器，但问题是这两者都是函数类型，为什么执行的时候会有不同的表现呢？可能有人觉得这还不简单，Python 具有词法作用域，由于 some_func 里面没有出现 yield 关键字，所以是普通函数，而 some_gen 里面出现了 yield，所以是生成器函数。 从源代码来看确实如此，但源代码是要编译成 PyCodeObject 对象的，在编译之后，函数内部是否出现 yield 关键字这一信息要怎么体现呢？答案便是通过 co_flags 字段。 然后解释器内部定义了一系列的标志位，通过和 co_flags 字段按位与，便可判断函数是否具备指定特征。常见的标志位如下： // Include/code.h // 函数参数是否包含 *args\n#define CO_VARARGS 0x0004\n// 函数参数是否包含 **kwargs\n#define CO_VARKEYWORDS 0x0008\n// 函数是否是内层函数\n#define CO_NESTED 0x0010\n// 函数是否是生成器函数\n#define CO_GENERATOR 0x0020\n// 函数是否是协程函数\n#define CO_COROUTINE 0x0080\n// 函数是否是异步生成器函数\n#define CO_ASYNC_GENERATOR 0x0200 我们实际测试一下，比如检测函数的参数类型： CO_VARARGS = 0x0004\nCO_VARKEYWORDS = 0x0008\nCO_NESTED = 0x0010 def foo(*args): pass def bar(): pass # 因为 foo 的参数包含 *args，所以和 CO_VARARGS 按位与的结果为真\n# 而 bar 的参数不包含 *args，所以结果为假\nprint(foo.__code__.co_flags & CO_VARARGS) # 4\nprint(bar.__code__.co_flags & CO_VARARGS) # 0 def foo(**kwargs): pass def bar(): pass print(foo.__code__.co_flags & CO_VARKEYWORDS) # 8\nprint(bar.__code__.co_flags & CO_VARKEYWORDS) # 0 def foo(): def bar(): pass return bar # foo 是外层函数，所以和 CO_NESTED 按位与的结果为假\n# foo() 返回的是内层函数，所以和 CO_NESTED 按位与的结果为真\nprint(foo.__code__.co_flags & CO_NESTED) # 0\nprint(foo().__code__.co_flags & CO_NESTED) # 16 当然啦，co_flags 还可以检测一个函数的类型。比如函数内部出现了 yield，那么它就是一个生成器函数，调用之后会得到一个生成器；使用 async def 定义，那么它就是一个协程函数，调用之后会得到一个协程。 这些在词法分析的时候就可以检测出来，编译之后会体现在 co_flags 字段中。 CO_GENERATOR = 0x0020\nCO_COROUTINE = 0x0080\nCO_ASYNC_GENERATOR = 0x0200 # 如果是生成器函数，那么 co_flags & 0x20 为真\ndef foo1(): yield\nprint(foo1.__code__.co_flags & 0x20) # 32 # 如果是协程函数，那么 co_flags & 0x80 为真\nasync def foo2(): pass\nprint(foo2.__code__.co_flags & 0x80) # 128\n# 显然 foo2 不是生成器函数，所以 co_flags & 0x20 为假\nprint(foo2.__code__.co_flags & 0x20) # 0 # 如果是异步生成器函数，那么 co_flags & 0x200 为真\nasync def foo3(): yield\nprint(foo3.__code__.co_flags & 0x200) # 512\n# 显然它不是生成器函数、也不是协程函数\n# 因此和 0x20、0x80 按位与之后，结果都为假\nprint(foo3.__code__.co_flags & 0x20) # 0\nprint(foo3.__code__.co_flags & 0x80) # 0 在判断函数种类时，这种方式是最优雅的。 co_firstlineno：代码块的起始位置在源文件中的哪一行 def foo(a, b, c): pass # 显然是文件的第一行\n# 或者理解为 def 所在的行\nprint(foo.__code__.co_firstlineno) # 1 如果函数出现了调用呢？ def foo(): return bar def bar(): pass print(foo().__code__.co_firstlineno) # 4 如果执行 foo，那么会返回函数 bar，因此结果是 def bar(): 所在的行数。所以每个函数都有自己的作用域，以及 PyCodeObject 对象。 co_code：指令集，也就是字节码，它是一个 bytes 对象 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 字节码，一个 bytes 对象，它保存了要操作的指令\n# 但光有字节码是肯定不够的，还需要其它的静态信息\n# 显然这些信息连同字节码一样，都位于 PyCodeObject 中\nprint(foo.__code__.co_code)\n\"\"\"\nb'd\\x01}\\x03d\\x02}\\x04d\\x03}\\x05t\\x00|\\x03|\\x04|\\x05\\x83\\x03\\x01\\x00d\\x00S\\x00'\n\"\"\" co_consts：常量池，一个元组，保存代码块中创建的所有常量 def foo(): a = 122 + 1 b = \"hello\" c = (1, 2) d = [\"x\", \"y\"] e = {\"p\": \"k\"} f = {7, 8} print(foo.__code__.co_consts)\n\"\"\"\n(None, 123, 'hello', (1, 2), 'x', 'y', 'p', 'k', 7, 8)\n\"\"\" co_consts 里面出现的都是编译阶段可以确定的常量，而 [\"x\", \"y\"] 和 {\"p\": \"k\"} 没有出现，由此我们可以得出，列表和字典绝不是在编译阶段构建的。编译时，只是收集了里面的元素，然后等到运行时再去动态构建。 不过问题来了，在构建的时候解释器怎么知道是要构建列表、还是字典、亦或是其它的什么对象呢？所以这就依赖于字节码了，解释字节码的时候，会判断到底要构建什么样的对象。因此解释器执行的是字节码，核心逻辑都体现在字节码中，但是光有字节码还不够，它包含的只是程序的主干逻辑，至于变量、常量，则从符号表和常量池里面获取。 另外函数里面的变量 a 等于 122 + 1，但常量池里面却存储了 123，这个过程叫做常量折叠。常量之间的加减乘除，结果依旧是一个常量，编译阶段就会计算好。 co_names：符号表，一个元组，保存代码块中引用的其它作用域的变量 c = 1 def foo(a, b): print(a, b, c) d = (list, int, str) print(foo.__code__.co_names)\n\"\"\"\n('print', 'c', 'list', 'int', 'str')\n\"\"\" 虽然一切皆对象，但看到的都是指向对象的变量，所以 print, c, list, int, str 都是变量，它们都不在当前 foo 函数的作用域中。 co_varnames：符号表，一个元组，保存当前作用域中创建的局部变量 def foo(a, b, c): name = \"satori\" age = 16 gender = \"f\" print(name, age, gender) # 当前作用域中创建的变量，注意它和 co_names 的区别\n# co_varnames 保存的是当前作用域中创建的局部变量\n# 而 co_names 保存的是当前作用域中引用的其它作用域的变量\nprint(foo.__code__.co_varnames)\n\"\"\"\n('a', 'b', 'c', 'name', 'age', 'gender')\n\"\"\"\nprint(foo.__code__.co_varnames)\n\"\"\"\n('print',)\n\"\"\" co_cellvars：一个元组，保存外层函数的作用域中被内层函数引用的变量 co_freevars：一个元组，保存内层函数引用的外层函数的作用域中的变量 def foo(a, b, c): def bar(): print(a, b, c) return bar # co_cellvars：外层函数的作用域中被内层函数引用的变量\n# co_freevars：内层函数引用的外层函数的作用域中的变量\nprint(foo.__code__.co_cellvars)\nprint(foo.__code__.co_freevars)\n\"\"\"\n('a', 'b', 'c')\n()\n\"\"\"\n# foo 里面的变量 a、b、c 被内层函数 bar 引用了\n# 所以它的 co_cellvars 是 ('a', 'b', 'c')\n# 而 foo 不是内层函数，所以它的 co_freevars 是 () bar = foo(1, 2, 3)\nprint(bar.__code__.co_cellvars)\nprint(bar.__code__.co_freevars)\n\"\"\"\n()\n('a', 'b', 'c')\n\"\"\"\n# bar 引用了外层函数 foo 里面的变量 a、b、c\n# 所以它的 co_freevars 是 ('a', 'b', 'c')\n# 而 bar 已经是最内层函数了，所以它的 co_cellvars 是 () 当然目前的函数只嵌套了两层，但嵌套三层甚至更多层也是一样的。 def foo(a, b, c): def bar(d, e): print(a) def func(): print(b, c, d, e) return func return bar # 对于 foo 而言，它的内层函数就是 bar\n# 至于最里面的 func，由于定义在 bar 的内部，因此可以看做是 bar 函数体的一部分\n# 而 foo 里面的变量 a、b、c 都被内层函数引用了\nprint(foo.__code__.co_cellvars) # ('a', 'b', 'c')\nprint(foo.__code__.co_freevars) # () bar = foo(1, 2, 3)\n# 对于函数 bar 而言，它的内层函数就是 func\n# 而显然 bar 里面的变量 d 和 e 被 func 引用了\nprint(bar.__code__.co_cellvars) # ('d', 'e')\n# 然后 bar 引用了外层函数 foo 里面的 a、b、c\nprint(bar.__code__.co_freevars) # ('a', 'b', 'c')\n# 所以 co_cellvars 和 co_freevars 这两个字段的关系有点类似镜像 co_cellvars 和 co_freevars 在后续介绍闭包的时候会用到。 co_filename：代码块所在的文件的路径 # 文件名：main.py\ndef foo(): pass print(foo.__code__.co_filename)\n\"\"\"\n/Users/satori/Documents/testing_project/main.py\n\"\"\" 如果你无法使用 IDE，那么便可通过该字段查看函数定义在哪个文件中。 co_name：代码块的名字 def foo(): pass print(foo.__code__.co_name) # foo 对于函数来说，代码块的名字就是函数名。 co_lnotab：负责存储指令的偏移量和源代码行号之间的对应关系 PyCodeObject 是源代码编译之后的产物，虽然两者的结构千差万别，但体现出的信息是一致的。像源代码具有行号，那么编译成 PyCodeObject 之后，行号信息也应该要有专门的字段来维护，否则报错时我们就无法快速定位到行号。 def foo(): name = \"古明地觉\" hobby = ( \"sing\", \"dance\", \"rap\", \"🏀\" ) age = 16 我们通过 dis 模块反编译一下。 第一列数字表示行号，第二列数字表示字节码指令的偏移量，或者说指令在整个字节码指令集中的索引。我们知道字节码指令集就是一段字节序列，由 co_code 字段维护，并且每个指令都带有一个参数，所以偏移量（索引）为 0 2 4 6 8 ··· 的字节表示指令，偏移量为 1 3 5 7 9 ··· 的字节表示参数。 关于反编译的具体细节后续会说，总之一个字节码指令就是一个八位整数。对于当前函数来说，它的字节码偏移量和行号的对应关系如下： 偏移量和源代码行号的对应关系便由 co_lnotab（一个字节序列）维护，只不过 co_lnotab 并没有直接记录这些信息，而是记录的增量值。 (0, 1) 到 (0, 2)：偏移量增加 0，行号增加 1； (0, 2) 到 (4, 3)：偏移量增加 4，行号增加 1； (4, 3) 到 (8, 9)：偏移量增加 4，行号增加 6； 所以 co_lnotab 便是 0 1 4 1 4 6，我们验证一下。 结果和我们分析的一样。 以上就是 PyCodeObject 里面的字段的含义，至于剩下的几个字段就无需关注了。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » PyCodeObject 字段解析","id":"227","title":"PyCodeObject 字段解析"},"228":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机。 编译器先将 .py 源码文件编译成 PyCodeObject 对象，然后再交给虚拟机执行。 PyCodeObject 对象可以认为是源码文件的另一种等价形式，但经过编译，虚拟机可以更快速地执行。 为了避免每次都要对源文件进行编译，因此编译后的结果会序列化在 .pyc 文件中，如果源文件没有做改动，那么下一次执行时会直接从 .pyc 文件中读取。 Python 的函数、类、模块等，都具有各自的作用域，每个作用域对应一个独立的代码块，在编译时，Python 编译器会为每个代码块都创建一个 PyCodeObject 对象。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"51. Python 源文件编译之后会得到什么，它的结构是怎样的？和字节码又有什么联系？ » 小结","id":"228","title":"小结"},"229":{"body":"上一篇文章我们介绍了 PyCodeObject 对象，但是还遗漏了一些内容，这里再单独补充一下。","breadcrumbs":"52. PyCodeObject 拾遗 » 楔子","id":"229","title":"楔子"},"23":{"body":"type 是所有类型对象的类型，我们称之为元类型或者元类，即 metaclass，当然它同时也是一个类型对象。下面看一下它的底层实现。 // Objects/typeobject.c PyTypeObject PyType_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"type\", /* tp_name */ sizeof(PyHeapTypeObject), /* tp_basicsize */ sizeof(PyMemberDef), /* tp_itemsize */ (destructor)type_dealloc, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ (reprfunc)type_repr, /* tp_repr */ 0, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ 0, /* tp_hash */ (ternaryfunc)type_call, /* tp_call */ // ...\n}; 所有的类型对象加上元类都是由 PyTypeObject 这个结构体实例化得到的，所以它们内部的字段都是一样的。只不过传入的值不同，实例化之后得到的结果也不同，可以是 PyLong_Type、可以是 PyFloat_Type，也可以是这里的 PyType_Type。 再看一下里面的宏 PyVarObject_HEAD_INIT，它用来初始化引用计数、类型和 ob_size，其中类型被初始化成了 &PyType_Type。换句话说，PyType_Type 里面的 ob_type 字段指向的还是 PyType_Type，而对应 Python 的话，就是 type 的类型还是 type。 >>> type.__class__\n<class 'type'>\n>>> type.__class__.__class__.__class__.__class__.__class__ is type\nTrue\n>>> type(type(type(type(type(type))))) is type\nTrue 显然不管套娃多少次，最终的结果都是 True，这也是符合预期的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的类型：PyType_Type","id":"23","title":"类型对象的类型：PyType_Type"},"230":{"body":"之前通过函数的 __code__ 属性获取了该函数的 PyCodeObject 对象，但是还有没有其它的方法呢？显然是有的，答案是通过内置函数 compile，不过在介绍 compile 之前，先介绍一下 eval 和 exec。 eval：传入一个字符串，然后把字符串里面的内容当做表达式。 a = 1\n# 所以 eval(\"a\") 就等价于 a\nprint(eval(\"a\")) # 1\nprint(eval(\"1 + 1 + 1\")) # 3 注意：eval 是有返回值的，返回值就是字符串里面的内容。所以 eval 接收的字符串里面一定是一个表达式，表达式计算之后是一个具体的值，比如 a = eval(\"1 + 2\")，等价于 a = 3。 但如果是语句的话，比如 a = eval(\"b = 3\")，这样等价于 a = (b = 3)，显然这会出现语法错误。因此 eval 函数把字符串两边的引号剥掉之后，得到的一定是一个普通的值。 try: print(eval(\"xxx\"))\nexcept NameError as e: print(e) # name 'xxx' is not defined 此时等价于 print(xxx)，但是 xxx 没有定义，所以报错。 # 此时是合法的，等价于 print('xxx')\nprint(eval(\"'xxx'\")) # xxx 以上就是 eval 函数，使用起来还是很方便的。 exec：传入一个字符串，把字符串里面的内容当成语句来执行，这个是没有返回值的，或者说返回值是 None。 # 相当于 a = 1\nexec(\"a = 1\") print(a) # 1 statement = \"\"\"\na = 123\nif a == 123: print(\"a 等于 123\")\nelse: print(\"a 不等于 123\")\n\"\"\"\nexec(statement) # a 等于 123 注意：a 等于 123 并不是 exec 返回的，而是把上面那坨字符串当成普通代码执行的时候 print 出来的。这便是 exec 的作用，将字符串当成语句来执行。 所以使用 exec 可以非常方便地创建多个变量。 import random for i in range(1, 5): exec(f\"a{i} = {random.randint(1, 100)}\") print(a1) # 72\nprint(a2) # 21\nprint(a3) # 38\nprint(a4) # 32 那么 exec 和 eval 的区别就显而易见了，eval 是要求字符串里面的内容能够当成一个值，并且该值就是 eval 函数的返回值。而 exec 则是直接执行里面的内容，返回值是 None。 print(eval(\"1 + 1\")) # 2\nprint(exec(\"1 + 1\")) # None # 相当于 a = 2\nexec(\"a = 1 + 1\")\nprint(a) # 2 try: # 相当于 a = 2，但很明显 a = 2 是一个语句 # 它无法作为一个值，因此放到 eval 里面就报错了 eval(\"a = 1 + 1\")\nexcept SyntaxError as e: print(e) # invalid syntax (<string>, line 1) 还是很好区分的，但是 eval 和 exec 在生产中尽量要少用。另外，eval 和 exec 还可以接收第二个参数和第三个参数，我们在介绍名字空间的时候再说。 compile：关键来了，它执行后返回的就是一个 PyCodeObject 对象。 这个函数接收哪些参数呢？ 参数一：当成代码执行的字符串 参数二：可以为这些代码起一个文件名 参数三：执行方式，支持三种，分别是 exec、single、eval 我们演示一下。 # exec：将源代码当做一个模块来编译\n# single：用于编译一个单独的 Python 语句（交互式）\n# eval：用于编译一个 eval 表达式\nstatement = \"a, b = 1, 2\"\n# 这里我们选择 exec，当成一个模块来编译\nco = compile(statement, \"古明地觉的编程教室\", \"exec\") print(co.co_firstlineno) # 1\nprint(co.co_filename) # 古明地觉的编程教室\nprint(co.co_argcount) # 0\n# 我们是以 a, b = 1, 2 这种方式赋值\n# 所以 (1, 2) 会被当成一个元组加载进来\n# 因此从这里可以看出，元组在编译阶段就已经确定好了\nprint(co.co_consts) # ((1, 2), None) statement = \"\"\"\na = 1\nb = 2\n\"\"\"\nco = compile(statement, \"<file>\", \"exec\")\nprint(co.co_consts) # (1, 2, None)\nprint(co.co_names) # ('a', 'b') 我们后面在分析 PyCodeObject 的时候，会经常使用 compile 函数。 然后 compile 还可以接收一个 flags 参数，也就是第四个参数，它的默认值为 0，表示按照标准模式进行编译，就是之前说的那几步。 对文本形式的源代码进行分词，将其切分成一个个的 Token； 对 Token 进行语法解析，生成抽象语法树（AST）； 将 AST 编译成 PyCodeObject 对象，简称 code 对象或者代码对象； 但如果将 flags 指定为 1024，那么 compile 函数在生成 AST 之后会直接停止，然后返回一个 _ast.Module 对象。 print( compile(\"a = 1\", \"<file>\", \"exec\").__class__\n) # <class 'code'> print( compile(\"a = 1\", \"<file>\", \"exec\", flags=1024).__class__\n) # <class '_ast.Module'> _ast 模块是和 Python 的抽象语法树相关的，那么问题来了，这个 _ast.Module 对象能够干什么呢？别着急，我们后续在介绍栈帧的时候说。不过由于抽象语法树比较底层，因此知道 compile 的前三个参数的用法即可。","breadcrumbs":"52. PyCodeObject 拾遗 » 内置函数 compile","id":"230","title":"内置函数 compile"},"231":{"body":"关于 Python 的字节码，是后面剖析虚拟机的重点，现在先来看一下。我们知道执行源代码之前会先编译得到 PyCodeObject 对象，里面的 co_code 字段指向了字节码序列，或者说字节码指令集。 虚拟机会根据这些指令集来进行一系列的操作（当然也依赖其它的静态信息），从而完成对程序的执行。关于指令，解释器定义了 100 多种，我们大致看一下。 // Include/opcode.h\n#define POP_TOP 1\n#define ROT_TWO 2\n#define ROT_THREE 3\n#define DUP_TOP 4\n#define DUP_TOP_TWO 5\n#define ROT_FOUR 6\n#define NOP 9\n#define UNARY_POSITIVE 10\n#define UNARY_NEGATIVE 11\n#define UNARY_NOT 12\n#define UNARY_INVERT 15\n#define BINARY_MATRIX_MULTIPLY 16\n#define INPLACE_MATRIX_MULTIPLY 17\n#define BINARY_POWER 19\n#define BINARY_MULTIPLY 20\n#define BINARY_MODULO 22\n#define BINARY_ADD 23\n#define BINARY_SUBTRACT 24\n#define BINARY_SUBSCR 25\n#define BINARY_FLOOR_DIVIDE 26\n#define BINARY_TRUE_DIVIDE 27\n#define INPLACE_FLOOR_DIVIDE 28\n#define INPLACE_TRUE_DIVIDE 29\n#define GET_AITER 50\n#define GET_ANEXT 51\n#define BEFORE_ASYNC_WITH 52\n#define BEGIN_FINALLY 53\n#define END_ASYNC_FOR 54\n#define INPLACE_ADD 55\n#define INPLACE_SUBTRACT 56\n#define INPLACE_MULTIPLY 57\n#define INPLACE_MODULO 59\n#define STORE_SUBSCR 60\n#define DELETE_SUBSCR 61\n#define BINARY_LSHIFT 62\n#define BINARY_RSHIFT 63\n#define BINARY_AND 64\n#define BINARY_XOR 65\n#define BINARY_OR 66\n#define INPLACE_POWER 67\n#define GET_ITER 68\n#define GET_YIELD_FROM_ITER 69\n#define PRINT_EXPR 70\n#define LOAD_BUILD_CLASS 71\n#define YIELD_FROM 72\n#define GET_AWAITABLE 73\n#define INPLACE_LSHIFT 75\n#define INPLACE_RSHIFT 76\n// ... 所谓字节码指令其实就是个整数，多个指令组合在一起便是字节码指令集（字节码序列），它是一个 bytes 对象。当然啦，指令集里面不全是指令，索引（偏移量）为偶数的字节表示指令，索引为奇数的字节表示指令参数，后续会细说。 然后我们可以通过反编译的方式查看每行 Python 代码都对应哪些操作指令。 # Python 的 dis 模块专门负责干这件事情\nimport dis def foo(a, b): c = a + b return c # 里面接收 PyCodeObject 对象\n# 当然函数也是可以的，会自动获取 co_code\ndis.dis(foo)\n\"\"\" 2 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 BINARY_ADD 6 STORE_FAST 2 (c) 3 8 LOAD_FAST 2 (c) 10 RETURN_VALUE\n\"\"\" 字节码反编译后的结果多么像汇编语言，其中第一列是源代码行号，第二列是字节码偏移量，第三列是字节码指令（也叫操作码），第四列是指令参数（也叫操作数）。Python 的字节码指令都是成对出现的，每个指令会带有一个指令参数。 另外查看字节码也可以使用 opcode 模块： from opcode import opmap opmap = {v: k for k, v in opmap.items()} def foo(a, b): c = a + b return c code = foo.__code__.co_code\nfor i in range(0, len(code), 2): print(\"操作码: {:<12} 操作数: {}\".format( opmap[code[i]], code[i+1] ))\n\"\"\"\n操作码: LOAD_FAST 操作数: 0\n操作码: LOAD_FAST 操作数: 1\n操作码: BINARY_ADD 操作数: 0\n操作码: STORE_FAST 操作数: 2\n操作码: LOAD_FAST 操作数: 2\n操作码: RETURN_VALUE 操作数: 0\n\"\"\" 总之字节码就是一段字节序列，转成列表之后就是一堆数字。偶数位置表示指令本身，而每个指令后面都会跟一个指令参数，也就是奇数位置表示指令参数。 所以指令本质上只是一个整数，而虚拟机会根据不同的指令执行不同的逻辑。说白了 Python 虚拟机执行字节码的逻辑就是把自己想象成一颗 CPU，并内置了一个巨型的 switch case 语句，其中每个指令都对应一个 case 分支。然后遍历整条字节码，拿到每一个指令和指令参数。接着对指令进行判断，不同的指令进入不同的 case 分支，执行不同的处理逻辑，直到字节码全部执行完毕或者程序出错。 关于执行字节码的具体流程，等介绍栈帧的时候细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"52. PyCodeObject 拾遗 » 字节码与反编译","id":"231","title":"字节码与反编译"},"232":{"body":"上一篇文章我们介绍了字节码，当时提到，py 文件在执行的时候会先被编译成 PyCodeObject 对象，并且该对象还会被保存到 pyc 文件中。 然而事实并不总是这样，有时当我们运行一个简单的程序时，并没有产生 pyc 文件。因此我们猜测：有些 Python 程序只是临时完成一些琐碎的工作，这样的程序仅仅只会运行一次，然后就不会再使用了，因此也就没有保存至 pyc 文件的必要。 如果我们在代码中加上了一个 import abc 这样的语句，再执行你就会发现解释器为 abc.py 生成了 pyc 文件，这就说明 import 语句会触发 pyc 的生成。 实际上，在运行过程中，如果碰到 import abc 这样的语句，那么 Python 会在设定好的 path 中寻找 abc.pyc 或者 abc.pyd 文件。但如果没有这些文件，而是只发现了 abc.py，那么会先将 abc.py 编译成 PyCodeObject，然后写入到 pyc 文件中。 接下来，再对 abc.pyc 进行 import 动作。对的，并不是编译成 PyCodeObject 对象之后就直接使用，而是先写到 pyc 文件里，然后再将 pyc 文件里面的 PyCodeObject 对象重新在内存中复制出来。 当然啦，触发 pyc 文件生成不仅可以通过 import，还可以通过 py_compile 模块手动生成。比如当前有一个 tools.py，代码如下。 a = 1\nb = \"你好啊\" 如何将其编译成 pyc 呢？ import py_compile py_compile.compile(\"tools.py\") 查看当前目录的 __pycache__ 目录，会发现 pyc 已经生成了。 py文件名.cpython-版本号.pyc 便是编译之后的 pyc 文件名。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的触发","id":"232","title":"pyc 文件的触发"},"233":{"body":"如果有一个现成的 pyc 文件，我们要如何导入它呢？ from importlib.machinery import SourcelessFileLoader tools = SourcelessFileLoader( \"tools\", \"__pycache__/tools.cpython-38.pyc\"\n).load_module() print(tools.a) # 1\nprint(tools.b) # 你好啊 以上我们就成功手动导入了 pyc 文件。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的导入","id":"233","title":"pyc 文件的导入"},"234":{"body":"pyc 文件在创建的时候都会往里面写入哪些内容呢？ 1）magic number 这是解释器内部定义的一个值，不同版本的解释器会定义不同的 magic number，这个值是为了保证能够加载正确的 pyc，比如 Python3.8 不会加载 3.7 版本的 pyc。因为解释器在加载 pyc 文件的时候会检测该 pyc 的 magic number，如果和自身的 magic number 不一致，说明此 pyc 是由其它版本的解释器写入的，因此拒绝加载。 from importlib.util import MAGIC_NUMBER\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: magic_number = f.read(4)\nprint(magic_number) # b'U\\r\\r\\n' pyc 文件的前 4 个字节便是 magic number。 2）py 文件的最后修改时间 这个很好理解，在加载 pyc 的时候会比较源代码的实际修改时间和 pyc 文件中存储的修改时间。如果两者不相等，说明在生成 pyc 之后，源代码又被修改了，那么会重新编译并写入 pyc，而反之则会直接加载已存在的 pyc。 3）py 文件的大小 py 文件的大小也会被记录在 pyc 文件中。 4）PyCodeObject 对象 编译之后的 PyCodeObject 对象，这个不用说了，肯定是要存储的，并且是序列化之后再存储。 因此 pyc 文件的结构如下： 我们实际验证一下： import struct\nfrom importlib.util import MAGIC_NUMBER\nfrom datetime import datetime with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 0 ~ 4 字节是 MAGIC NUMBER\nprint(data[: 4]) # b'U\\r\\r\\n'\nprint(MAGIC_NUMBER) # b'U\\r\\r\\n' # 4 ~ 8 字节是 4 个 \\x00\nprint(data[4: 8]) # b'\\x00\\x00\\x00\\x00' # 8 ~ 12 字节是 py 文件的最后修改时间（小端存储），一个时间戳\nts = struct.unpack(\"<I\", data[8: 12])[0]\nprint(ts) # 1734595934\nprint(datetime.fromtimestamp(ts)) # 2024-12-19 08:12:14 # 12 ~ 16 字节是 py 文件的大小\nprint(struct.unpack(\"<I\", data[12: 16])[0]) # 22 那么实际的 tools.py 是不是这样呢？我们查看一下。 结果没有问题，实际大小是 22 字节，和 pyc 文件记录的一样。然后是最后修改时间，由于在生成 pyc 之后，没有对源文件做修改，所以它的最后修改时间和 pyc 文件记录的一样，都是 08:12。但如果我们再对 tools.py 做修改的话，那么它的最后修改时间和 pyc 文件记录的就不一样了，此时如果再导入 tools.py 就会重新编译生成 pyc，并写入新的最后修改时间。 以上就是 pyc 文件的前 16 个字节，而 16 个字节往后就是 PyCodeObject 对象，并且是序列化之后的，因为该对象显然无法直接存在文件中。 import marshal with open(\"__pycache__/tools.cpython-38.pyc\", \"rb\") as f: data = f.read() # 通过 marshal.loads 可以反序列化\n# marshal.dumps 则表示序列化\ncode = marshal.loads(data[16:])\n# 此时就拿到了 py 文件编译之后的 PyCodeObject\nprint(code)\n\"\"\"\n<code object <module> at 0x..., file \"tools.py\", line 1>\n\"\"\"\n# 查看常量池\nprint(code.co_consts) # (1, '你好啊', None) # 符号表\nprint(code.co_names) # ('a', 'b') 常量池和符号表都是正确的。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件都包含哪些内容","id":"234","title":"pyc 文件都包含哪些内容"},"235":{"body":"下面通过源码来查看 pyc 文件的写入过程，既然要写入，那么肯定要有文件句柄。 // Python/marshal.c // FILE 是 C 自带的文件句柄\n// 可以把 WFILE 看成是 FILE 的包装\ntypedef struct { FILE *fp; // 下面的字段在写入数据的时候会看到 int error; int depth; PyObject *str; char *ptr; char *end; char *buf; _Py_hashtable_t *hashtable; int version;\n} WFILE; 首先是写入 magic number、创建时间和文件大小，它们会调用 PyMarshal_WriteLongToFile 函数进行写入： // Python/marshal.c\nvoid\nPyMarshal_WriteLongToFile(long x, FILE *fp, int version)\n{ // magic number、创建时间和文件大小，只是一个 4 字节整数 // 因此使用 char[4] 来保存 char buf[4]; // 声明一个 WFILE 类型的变量 wf WFILE wf; // 内存初始化 memset(&wf, 0, sizeof(wf)); // 初始化内部字段 wf.fp = fp; // 文件句柄 wf.ptr = wf.buf = buf; // buf 数组首元素的地址 wf.end = wf.ptr + sizeof(buf); // buf 数组尾元素的地址 wf.error = WFERR_OK; wf.version = version; // 调用 w_long 将信息写到 wf 里面 // 写入的信息可以是 magic number、时间和文件大小 w_long(x, &wf); // 刷到磁盘上 w_flush(&wf);\n} 所以该函数只是初始化了一个 WFILE 对象，真正写入则是调用的 w_long。 // Python/marshal.c\nstatic void\nw_long(long x, WFILE *p)\n{ w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); w_byte((char)((x>>16) & 0xff), p); w_byte((char)((x>>24) & 0xff), p);\n} w_long 则是调用 w_byte 将 x 逐个字节地写到文件里面去。 当头信息写完之后，就该写 PyCodeObject 对象了，这个过程由 PyMarshal_WriteObjectToFile 函数负责。 // Python/marshal.c\nvoid\nPyMarshal_WriteObjectToFile(PyObject *x, FILE *fp, int version)\n{ char buf[BUFSIZ]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; if (w_init_refs(&wf, version)) return; /* caller mush check PyErr_Occurred() */ // 写入头信息由 PyMarshal_WriteLongToFile 负责，它内部会调用 w_long // 写入 PyCodeObject 由当前函数负责，它内部会调用 w_object w_object(x, &wf); w_clear_refs(&wf); w_flush(&wf);\n} 然后我们看一下 w_object 函数。 // Python/marshal.c\nstatic void\nw_object(PyObject *v, WFILE *p)\n{ char flag = '\\0'; p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->error = WFERR_NESTEDTOODEEP; } else if (v == NULL) { w_byte(TYPE_NULL, p); } else if (v == Py_None) { w_byte(TYPE_NONE, p); } else if (v == PyExc_StopIteration) { w_byte(TYPE_STOPITER, p); } else if (v == Py_Ellipsis) { w_byte(TYPE_ELLIPSIS, p); } else if (v == Py_False) { w_byte(TYPE_FALSE, p); } else if (v == Py_True) { w_byte(TYPE_TRUE, p); } else if (!w_ref(v, &flag, p)) w_complex_object(v, flag, p); p->depth--;\n} 可以看到 w_object 和 w_long 一样，本质上都是调用了 w_byte。当然 w_byte 只能写入一些简单数据，如果是列表、字典之类的数据，那么会调用 w_complex_object 函数，也就是代码中的最后一个 else if 分支。 w_complex_object 这个函数的源代码很长，我们看一下整体结构，具体逻辑就不贴了，后面会单独截取一部分进行分析。 // Python/marshal.c static void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ Py_ssize_t i, n; // 如果是整数，执行整数的写入逻辑 if (PyLong_CheckExact(v)) { // ... } // 如果是浮点数，执行浮点数的写入逻辑 else if (PyFloat_CheckExact(v)) { // ... } // 如果是复数，执行复数的写入逻辑 else if (PyComplex_CheckExact(v)) { // ... } // 如果是字节序列，执行字节序列的写入逻辑 else if (PyBytes_CheckExact(v)) { // ... } // 如果是字符串，执行字符串的写入逻辑 else if (PyUnicode_CheckExact(v)) { // ... } // 如果是元组，执行元组的写入逻辑 else if (PyTuple_CheckExact(v)) { // ... } // 如果是列表，执行列表的写入逻辑 else if (PyList_CheckExact(v)) { // ... } // 如果是字典，执行字典的写入逻辑 else if (PyDict_CheckExact(v)) { // ... } // 如果是集合，执行集合的写入逻辑 else if (PyAnySet_CheckExact(v)) { // ... } // 如果是 PyCodeObject 对象，执行 PyCodeObject 对象的写入逻辑 else if (PyCode_Check(v)) { // ... } // 如果是 Buffer，执行 Buffer 的写入逻辑 else if (PyObject_CheckBuffer(v)) { // ... } else { W_TYPE(TYPE_UNKNOWN, p); p->error = WFERR_UNMARSHALLABLE; }\n} 源代码虽然长，但是逻辑非常单纯，就是对不同的对象、执行不同的写动作，然而其最终目的都是通过 w_byte 写到 pyc 文件中。了解完函数的整体结构之后，我们再看一下具体细节，看看它在写入对象的时候到底写入了哪些内容？ // Python/marshal.c\nstatic void\nw_complex_object(PyObject *v, char flag, WFILE *p)\n{ // ...... else if (PyList_CheckExact(v)) { W_TYPE(TYPE_LIST, p); n = PyList_GET_SIZE(v); W_SIZE(n, p); for (i = 0; i < n; i++) { w_object(PyList_GET_ITEM(v, i), p); } } else if (PyDict_CheckExact(v)) { Py_ssize_t pos; PyObject *key, *value; W_TYPE(TYPE_DICT, p); /* This one is NULL object terminated! */ pos = 0; while (PyDict_Next(v, &pos, &key, &value)) { w_object(key, p); w_object(value, p); } w_object((PyObject *)NULL, p); } // ......\n} 以列表和字典为例，它们在写入的时候实际上写的是内部的元素，其它对象也是类似的。 def foo(): lst = [1, 2, 3] # 把列表内的元素写进去了\nprint( foo.__code__.co_consts\n) # (None, 1, 2, 3) 但很明显，如果只是将元素收集起来显然是不够的，否则 Python 在加载的时候怎么知道它是一个列表呢？所以在写入的时候不能光写数据，还要将类型信息也写进去。我们再看一下上面列表和字典的写入逻辑，里面都调用了 W_TYPE，它负责写入类型信息。 因此无论对于哪种对象，在写入具体数据之前，都会先调用 W_TYPE 将类型信息写进去。如果没有类型信息，那么当解释器加载 pyc 文件的时候，只会得到一坨字节流，而无法解析字节流中隐藏的结构和蕴含的信息。所以在往 pyc 文件里写入数据之前，必须先写入一个标识，比如 TYPE_LIST、TYPE_TUPLE、TYPE_DICT 等等，这些标识正是对应的类型信息。 如果解释器在 pyc 文件中发现了这样的标识，则预示着上一个对象结束，新的对象开始，并且也知道新对象是什么样的对象，从而也知道该执行什么样的构建动作。至于这些标识都是可以看到的，在底层已经定义好了。 到了这里可以看到，Python 对 PyCodeObject 对象的导出实际上是不复杂的。因为不管什么对象，最后都会归结为两种简单的形式，一种是数值写入，一种是字符串写入。 上面都是对数值的写入，比较简单，仅仅需要按照字节依次写入 pyc 即可。然而在写入字符串的时候，Python 设计了一种比较复杂的机制，有兴趣可以自己阅读源码，这里不再介绍。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » pyc 文件的写入","id":"235","title":"pyc 文件的写入"},"236":{"body":"最后再来说一下字节码混淆，我们知道 pyc 是可以反编译的，而且目前也有现成的工具。但这些工具会将每一个指令都解析出来，所以字节码混淆的方式就是往里面插入一些恶意指令（比如加载超出范围的数据），让反编译工具在解析的时候报错，从而失去作用。 但插入的恶意指令还不能影响解释器执行，因此还要插入一些跳转指令，从而让解释器跳过恶意指令。 混淆之后多了两条指令，其中偏移量为 8 的指令，参数为 255，表示加载常量池中索引为 255 的元素。如果常量池没有这么多元素，那么显然会发生索引越界，导致反编译的时候报错。 但对于解释器来说，是可以正常执行的，因为在执行到偏移量为 6 的指令时出现了一个相对跳转，直接跳到偏移量为 6 + 4 = 10 的指令了。 因此对于解释器执行来说，混淆前后是没有区别的，但对于反编译工具而言则无法正常工作，因为它会把每个指令都解析一遍。根据这个思路，我们可以插入很多很多的恶意指令，然后再利用跳转指令来跳过这些不合法的指令。当然混淆的手段并不止这些，我们还可以添加一些虚假的分支，然后在执行时跳转到真实的分支当中。 而这一切的目的，都是为了防止别人根据 pyc 文件反推出源代码。不过这种做法属于治标不治本，如果真的想要保护源代码的话，可以使用 Cython 将其编译成 pyd ，这是最推荐的做法。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"53. 一文让你搞懂 pyc 文件 » 字节码混淆","id":"236","title":"字节码混淆"},"237":{"body":"从现在开始，我们将剖析虚拟机运行字节码的原理。前面说了，Python 解释器可以分为两部分：Python 编译器和 Python 虚拟机。编译器将源代码编译成 PyCodeObject 对象之后，就由虚拟机接手整个工作。虚拟机会从 PyCodeObject 中读取字节码，并在当前的上下文中执行，直到所有的字节码都被执行完毕。 那么问题来了，既然源代码在经过编译之后，字节码指令以及静态信息都存储在 PyCodeObject 当中，那么是不是意味着虚拟机就在 PyCodeObject 对象上进行所有的动作呢？ 很明显不是的，因为尽管 PyCodeObject 包含了关键的字节码指令以及静态信息，但有一个东西是没有包含、也不可能包含的，就是程序在运行时的执行环境，这个执行环境在 Python 里面就是栈帧。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 楔子","id":"237","title":"楔子"},"238":{"body":"那什么是栈帧呢？我们举个例子。 name = \"古明地觉\" def some_func(): name = \"八意永琳\" print(name) some_func()\nprint(name) 上面的代码当中出现了两个 print(name)，它们的字节码指令相同，但执行的效果却显然是不同的，这样的结果正是执行环境的不同所产生的。因为环境的不同，name 的值也不同。 因此同一个符号在不同环境中可能指向不同的类型、不同的值，必须在运行时进行动态捕捉和维护，这些信息不可能在 PyCodeObject 对象中被静态存储。 所以可以得出结论，虚拟机并不是在 PyCodeObject 对象上执行操作的，而是在栈帧对象上。虚拟机在执行时，会根据 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。所以栈帧是虚拟机执行的上下文，执行时依赖的所有信息都存储在栈帧中。 然后对于上面的代码，我们可以大致描述一下流程： 首先基于模块的 PyCodeObject 创建一个栈帧，假设叫 A，所有的字节码都会在栈帧中执行，虚拟机可以从栈帧里面获取变量的值，也可以修改； 当发生函数调用的时候，这里是 some_func，那么虚拟机会在栈帧 A 之上，为 some_func 创建一个新的栈帧，假设叫 B，然后在栈帧 B 里面执行函数 some_func 的字节码指令； 在栈帧 B 里面也有一个名字为 name 的变量，但由于执行环境、或者说栈帧的不同，name 指向的对象也不同； 一旦函数 some_func 的字节码指令全部执行完毕，那么会将当前的栈帧 B 销毁（也可以保留），再回到调用者的栈帧中来。就像是递归一样，每当调用函数时，就会在当前栈帧之上创建一个新的栈帧，一层一层创建，一层一层返回；","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧：虚拟机的执行环境","id":"238","title":"栈帧：虚拟机的执行环境"},"239":{"body":"不难发现，Python 虚拟机执行字节码这个过程，就是在模拟操作系统运行可执行文件。比如： 程序加载 操作系统：加载可执行文件到内存，设置程序计数器。 Python 虚拟机：加载 .pyc 文件中的 PyCodeObject 对象，初始化字节码指令指针。 内存管理 操作系统：为进程分配内存空间，管理堆和栈。 Python 虚拟机：创建和管理 Python 对象，处理内存分配和垃圾回收。 指令执行 操作系统：CPU 逐条执行机器指令。 Python 虚拟机：虚拟机逐条执行字节码指令。 资源管理 操作系统：管理文件句柄、网络连接等系统资源。 Python 虚拟机：管理文件对象、套接字等 Python 级别的资源。 异常处理 操作系统：处理硬件中断和软件异常。 Python 虚拟机：捕获和处理 Python 异常。 我们简单地画一张示意图，来看看在一台普通的 x64 机器上，可执行文件是以什么方式运行的，在这里主要关注栈帧的变化。假设有三个函数，函数 f 调用了函数 g，函数 g 又调用了函数 h。 首先 CPU 有两个关键的寄存器，它们在函数调用和栈帧管理中扮演关键角色。 RSP（Stack Pointer）：栈指针，指向当前栈帧的顶部，或者说最后一个入栈的元素。因此随着元素的入栈和出栈，RSP 会动态变化。由于地址从栈底到栈顶是逐渐减小的，所以 RSP 会随着数据入栈而减小，随着数据出栈而增大。当然不管 RSP 怎么变，它始终指向当前栈的顶部。 RBP（Base Pointer）：基指针，指向当前栈帧的基址，它的作用是提供一个固定的参考点，用于访问当前函数的局部变量和参数。当新的帧被创建时，它的基址会保存上一个帧的基址，并由 RBP 指向。 我们用一段 C 代码来解释一下。 #include <stdio.h> int add(int a, int b) { int c = a + b; return c;\n} int main() { int a = 11; int b = 22; int result = add(a, b); printf(\"a + b = %d\\n\", result);\n} 当执行函数 main 的时候，RSP 指向 main 栈帧的顶部，RBP 指向 main 栈帧的基址。然后在 main 里面又调用了函数 add，那么毫无疑问，系统会在地址空间中，在 main 的栈帧之上为 add 创建栈帧。然后让 RSP 指向 add 栈帧的顶部，RBP 指向 add 栈帧的基址，而 add 栈帧的基址保存了上一级栈帧（main 栈帧）的基址。 当函数 add 执行结束时，会销毁对应栈帧，再将 RSP 和 RBP 恢复为创建 add 栈帧之前的值，这样程序的执行流程就又回到了函数 main 里面，当然程序的运行空间也回到了函数 main 的栈帧中。 不难发现，通过两个 CPU 寄存器 RSP、RBP，以及栈帧中保存的上一级栈帧的基址，完美地维护了函数之间的调用链，这就是可执行文件在 x64 机器上的运行原理。 那么 Python 里面的栈帧是怎样的呢？","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 虚拟机和操作系统","id":"239","title":"虚拟机和操作系统"},"24":{"body":"Python 中有两个类型对象比较特殊，一个是站在类型金字塔顶端的 type，另一个是站在继承金字塔顶端的 object。看完了 type，再来看看 object。 由于 object 的类型是 type，那么在初始化 PyBaseObject_Type 的时候，它的 ob_type 一定也被设置成了 &PyType_Type。 我们看一下 PyBaseObject_Type 的具体实现，它同样定义在 Objects/typeobject.c 中。 类型对象在创建的时候，ob_type 字段都会被初始化成 &PyType_Type，而 object 也不例外，所以它的类型为 type，这个非常简单。但 type 的基类是 object，又是怎么一回事呢？ 之前介绍类型对象的时候，我们说类型对象内部的 tp_base 指向继承的基类，那么对于 PyType_Type 来讲，它内部的 tp_base 肯定是 &PyBaseObject_Type，即 object。 但令我们吃鲸的是，它的 tp_base 居然是个 0，也就是说基类为空。 在 C 中，将指针变量赋值为 0 和赋值为 NULL 是等价的，因为 NULL 就是值为 0 的指针常量。 不是说 type 的基类是 object 吗？为啥 tp_base 是 0 呢。事实上如果你去看其它类型的话，会发现它们内部的 tp_base 也是 0。为 0 的原因就在于我们目前看到的类型对象还不够完善，因为 Python 的动态性，显然不可能在定义的时候就将所有字段属性都设置好、然后解释器一启动就得到我们平时使用的类型对象。 因此目前看到的类型对象还不是最终形态，有一部分字段属性是在解释器启动之后再动态完善的，而这个完善的过程被称为类型对象的初始化，它由函数 PyType_Ready 负责。 // Objects/typeobject.c int\nPyType_Ready(PyTypeObject *type)\n{ // ... // 注意这里的 type 是一个 C 函数的参数，不是 Python 里的 <class 'type'> // 获取类型对象的基类（指针） base = type->tp_base; // 如果类型对象的 tp_base 为空，并且本身也不是 &PyBaseObject_Type // 那么就将它的 tp_base 设置为 &PyBaseObject_Type if (base == NULL && type != &PyBaseObject_Type) { base = type->tp_base = &PyBaseObject_Type; Py_INCREF(base); } // ...\n} 当解释器发现类对象还没有初始化时，会将其作为参数传递给 PyType_Ready，进行初始化。 初始化过程会做很多的工作，用于完善类型对象，而其中一项工作就是设置基类。如果发现类型对象的基类为空，那么就将基类设置为 object，因为在 Python3 里面新式类都要继承 object。当然啦，这个类不能是 object 本身，object 的基类是 None，因为继承链向上要有一个终点。 当 PyType_Ready 完成初始化之后，就得到我们平常使用的类型对象了，最终 PyType_Type 和 PyBaseObject_Type 的关系如下。 因此到目前为止，type 和 object 之间的恩怨纠葛算是真相大白了，总结一下： 1）和自定义类不同，内置的类不是由 type 实例化得到的，它们都是在底层预先定义好的，不存在谁创建谁。只是内置的类在定义的时候，它们的类型都被设置成了 type。这样不管是内置的类，还是自定义类，在调用时都可以执行 type 的 __call__ 函数，从而让它们的行为是一致的。 2）虽然内置的类在底层预定义好了，但还有一些瑕疵，因为有一部分逻辑无法以源码的形式体现，只能在解释器启动的时候再动态完善。而这个完善的过程，便包含了基类的填充，会将基类设置成 object。 所以 type 和 object 是同时出现的，它们的存在需要依赖彼此。首先这两者会以不完全体的形式定义在源码中，并且在定义的时候将 object 的类型设置成 type；然后当解释器启动的时候，再经过动态完善，进化成完全体，而进化的过程中会将 type 的基类设置成 object。 因此 object 的类型是 type，type 继承 object 就是这么来的。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 类型对象的基类：PyBaseObject_Type","id":"24","title":"类型对象的基类：PyBaseObject_Type"},"240":{"body":"相较于 x64 机器上看到的那个简简单单的栈帧，Python 的栈帧实际上包含了更多的信息。注：栈帧也是一个对象。 // Include/frameobject.h typedef struct _frame { PyObject_VAR_HEAD struct _frame *f_back; PyCodeObject *f_code; PyObject *f_builtins; PyObject *f_globals; PyObject *f_locals; PyObject **f_valuestack; PyObject **f_stacktop; PyObject *f_trace; char f_trace_lines; char f_trace_opcodes; PyObject *f_gen; int f_lasti; int f_lineno; int f_iblock; char f_executing; PyTryBlock f_blockstack[CO_MAXBLOCKS]; PyObject *f_localsplus[1];\n} PyFrameObject; 下面来解释一下里面的每个字段都是啥含义，不过在解释之前，我们要先知道如何在 Python 中获取栈帧对象。 import inspect def foo(): # 返回当前所在的栈帧 # 这个函数实际上是调用了 sys._getframe(1) return inspect.currentframe() frame = foo()\nprint(frame) \"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\nprint(type(frame)) \"\"\"\n<class 'frame'>\n\"\"\" 我们看到栈帧的类型是 <class 'frame'>，正如 PyCodeObject 对象的类型是 <class 'code'> 一样，这两个类没有暴露给我们，所以不可以直接使用。 同理，还有 Python 的函数，类型是 <class 'function'>，模块的类型是 <class 'module'>。这些解释器都没有给我们提供，如果直接使用的话，那么 frame、code、function、module 只是几个没有定义的变量罢了，这些类我们只能通过这种间接的方式获取。 下面来看一下 PyFrameObject 里面每个字段的含义。 PyObject_VAR_HEAD 变长对象的头部信息，所以栈帧也是一个对象。 struct _frame *f_back 当前栈帧的上一级栈帧，也就是调用者的栈帧。所以 x64 机器是通过 RSP、RBP 两个指针维护函数的调用关系，而 Python 虚拟机则是通过栈帧的 f_back 字段。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame)\n\"\"\"\n<frame at 0x100de0fc0, file '.../main.py', line 6, code foo>\n\"\"\"\n# foo 的上一级栈帧，显然对应的是模块的栈帧\nprint(frame.f_back)\n\"\"\"\n<frame at 0x100adde40, file '.../main.py', line 12, code <module>>\n\"\"\"\n# 相当于模块的上一级栈帧，显然是 None\nprint(frame.f_back.f_back)\n\"\"\"\nNone\n\"\"\" 因此通过栈帧，可以轻松地获取完整的函数调用链路，我们一会儿演示。 PyCodeObject *f_code 栈帧对象是在 PyCodeObject 之上构建的，所以它内部一定有一个字段指向 PyCodeObject，而该字段就是 f_code。 import inspect def e(): f() def f(): g() def g(): h() def h(): frame = inspect.currentframe() # 获取栈帧 func_names = [] # 只要 frame 不为空，就一直循环，并将函数名添加到列表中 while frame is not None: func_names.append(frame.f_code.co_name) frame = frame.f_back print(f\"函数调用链路：{' -> '.join(func_names[:: -1])}\") f()\n\"\"\"\n函数调用链路：<module> -> f -> g -> h\n\"\"\" 模块 -> f -> g -> h，显然我们获取了整个调用链路，是不是很有趣呢？ PyObject *f_builtins、*f_gloabls、*f_locals 这三者均表示名字空间，其中 f_gloabls 指向全局名字空间（一个字典），它是全局变量的容身之所。是的，Python 的全局变量是通过字典存储的，调用函数 globals 即可拿到该字典。 # 等价于 name = \"古明地觉\"\nglobals()[\"name\"] = \"古明地觉\" # 等价于 print(name)\nprint(globals()[\"name\"]) # 古明地觉 def foo(): import inspect return inspect.currentframe() frame = foo()\n# frame.f_globals 同样会返回全局名字空间\nprint(frame.f_globals is globals()) # True\n# 相当于创建了一个全局变量 age\nframe.f_globals[\"age\"] = 18\nprint(age) # 18 关于名字空间，我们后面会用专门的篇幅详细说明。 然后 f_locals 指向局部名字空间（一个字典），但和全局变量不同，局部变量不存在局部名字空间中，而是静态存储在数组中。该字段先有个印象，后续再详细说。 f_builtins 指向内置名字空间（一个字典），显然一些内置的变量都存在里面。 def foo(): import inspect return inspect.currentframe() frame = foo()\nprint(frame.f_builtins[\"list\"](\"abcd\"))\n\"\"\"\n['a', 'b', 'c', 'd']\n\"\"\" 和我们直接使用 list(\"abcd\") 是等价的。 PyObject **f_valuestack 指向运行时栈的栈底，关于什么是运行时栈，后续详细说明。 PyObject **f_stacktop 指向运行时栈的栈顶。 PyObject *f_trace 追踪函数，用于调试。 char f_trace_lines 是否为每一行代码调用追踪函数，当设置为真（非零值）时，每当虚拟机执行到一个新的代码行时，都会调用追踪函数。这允许调试器在每行代码执行时进行干预，比如设置断点、检查变量等。 char f_trace_opcodes 是否为每个字节码指令调用追踪函数，当设置为真时，虚拟机会在执行每个字节码指令之前调用追踪函数。这提供了更细粒度的控制，允许进行指令级别的调试。 所以不难发现，f_trace_lines 是行级追踪，对应源代码的每一行，通常用于普通的调试，如设置断点、单步执行等，并且开销相对较小。f_trace_opcodes 是指令级追踪，对应每个字节码指令，通常用于更深层次的调试，比如分析具体的字节码执行过程，并且开销较大。 import sys def trace_lines(frame, event, arg): print(f\"行号：{frame.f_lineno}，文件名：{frame.f_code.co_filename}\") return trace_lines sys.settrace(trace_lines) 设置追踪函数一般需要通过 sys.settrace，不过不常用，了解一下即可。 PyObject *f_gen 是否是基于生成器的 PyCodeObject 构建的栈帧。 int f_lasti 上一条已执行完毕的指令在指令序列中的偏移量。 int f_lineno 获取该栈帧时的源代码行号。 import inspect def foo(): return inspect.currentframe() frame = foo()\nprint(frame.f_lineno) # 4 我们是在第 4 行获取的栈帧，所以打印结果是 4。 int f_iblock 用于跟踪 try / except / finally 代码块的层级深度。具体等介绍异常捕获的时候再说，总之 f_iblock 对于虚拟机的异常捕获来说非常重要，可以在异常处理时确定当前代码在哪个 try 语句块内，帮助确定应该执行哪个 except 或 finally 子句，保证异常处理和清理代码能按正确的嵌套顺序执行。 char f_executing 当前栈帧是否仍在执行。 PyTryBlock f_blockstack[CO_MAXBLOCKS] 一个栈，用于追踪代码块，比如代码块的进入和退出，以及管理代码块的上下文信息。那么都支持哪些代码块呢？ SETUP_FINALLY：try / finally 块 SETUP_WITH：with 语句块 SETUP_ASYNC_WITH：async with 语句块 PyObject *localsplus[1] 一个柔性数组，负责维护 \"局部变量 + cell 变量 + free 变量 + 运行时栈\"，大小在运行时确定。 以上就是栈帧内部的字段，这些字段先有个印象，后续在剖析虚拟机的时候还会继续细说。 总之我们看到，PyCodeObject 并不是虚拟机的最终目标，虚拟机最终是在栈帧中执行的。每一个栈帧都会维护一个 PyCodeObject 对象，换句话说，每一个 PyCodeObject 对象都会隶属于一个栈帧。并且从 f_back 可以看出，虚拟机在实际执行时，会产生很多的栈帧对象，而这些对象会被链接起来，形成一条执行环境链表，或者说栈帧链表。 而这正是 x64 机器上栈帧之间关系的模拟，在 x64 机器上，栈帧之间通过 RSP 和 RBP 指针建立了联系，使得新栈帧在结束之后能够顺利地返回到旧栈帧中，而 Python 虚拟机则是利用 f_back 来完成这个动作。 当然，获取栈帧除了通过 inspect 模块之外，在捕获异常时，也可以获取栈帧。 def foo(): try: 1 / 0 except ZeroDivisionError: import sys # exc_info 返回一个三元组 # 分别是异常的类型、值、以及 traceback exc_type, exc_value, exc_tb = sys.exc_info() print(exc_type) # <class 'ZeroDivisionError'> print(exc_value) # division by zero print(exc_tb) # <traceback object at 0x00000135CEFDF6C0> # 调用 exc_tb.tb_frame 即可拿到异常对应的栈帧 # 另外这个 exc_tb 也可以通过下面这种方式获取 # except ZeroDivisionError as e; e.__traceback__ print(exc_tb.tb_frame.f_code.co_name) # foo print(exc_tb.tb_frame.f_back.f_code.co_name) # <module> # 显然 tb_frame 是当前函数 foo 的栈帧 # 那么 tb_frame.f_back 就是整个模块对应的栈帧 # 而 tb_frame.f_back.f_back 显然就是 None 了 print(exc_tb.tb_frame.f_back.f_back) # None foo() 关于栈帧内部的字段的含义，我们就说完了。当然如果有些字段现在不是很理解，也没关系，随着不断地学习，你会豁然开朗。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 栈帧的底层结构","id":"240","title":"栈帧的底层结构"},"241":{"body":"因为很多动态信息无法静态地存储在 PyCodeObject 对象中，所以 PyCodeObject 对象在交给虚拟机之后，虚拟机会在其之上动态地构建出 PyFrameObject 对象，也就是栈帧。 因此虚拟机是在栈帧里面执行的字节码，它包含了虚拟机在执行字节码时依赖的全部信息。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"54. 深度解密虚拟机的执行环境：栈帧对象 » 小结","id":"241","title":"小结"},"242":{"body":"在介绍栈桢的时候，我们看到了 3 个独立的名字空间：f_locals、f_globals、f_builtins。名字空间对 Python 来说是一个非常重要的概念，虚拟机的运行机制和名字空间有着非常紧密的联系。并且在 Python 中，与名字空间这个概念紧密联系在一起的还有名字、作用域这些概念，下面我们就来剖析这些概念是如何体现的。","breadcrumbs":"55. 名字空间：变量的容身之所 » 楔子","id":"242","title":"楔子"},"243":{"body":"在这个系列的最开始我们就说过，从解释器的角度来看，变量只是一个泛型指针 PyObject *，而从 Python 的角度来看，变量只是一个名字、或者说符号，用于和对象进行绑定的。 name = \"古明地觉\" 上面这个赋值语句其实就是将 name 和 \"古明地觉\" 绑定起来，让我们可以通过 name 这个符号找到对应的 PyUnicodeObject。因此定义一个变量，本质上就是建立名字和对象之间的映射关系。 另外我们说 Python 虽然一切皆对象，但拿到的都是指向对象的指针，因此创建函数和类，以及模块导入，同样是在完成名字和对象的绑定。 def foo(): pass class A(): pass 创建一个函数也相当于定义一个变量，会先根据函数体创建一个函数对象，然后将名字 foo 和函数对象绑定起来。所以函数名和函数体之间是分离的，同理类也是如此。 import os 导入一个模块，也是在定义一个变量。import os 相当于将名字 os 和模块对象绑定起来，通过 os 可以找到指定的模块对象。 当我们导入一个模块的时候，解释器是这么做的。 import os 等价于 os = __import__(\"os\")，可以看到本质上还是一个赋值语句。 import numpy as np 中的 as 语句同样是在定义变量，将名字 np 和对应的模块对象绑定起来，以后就可以通过 np 这个名字去获取指定的模块了。 总结：无论是普通的赋值语句，还是定义函数和类，亦或是模块导入，它们本质上都是在完成变量和对象的绑定。 name = \"古明地觉\" def foo(): pass class A(): pass import os\nimport numpy as np 里面的 name、foo、A、os、np，都只是一个变量，或者说名字、符号，然后通过名字可以获取与之绑定的对象。","breadcrumbs":"55. 名字空间：变量的容身之所 » 变量只是一个名字","id":"243","title":"变量只是一个名字"},"244":{"body":"正如上面所说，赋值语句、函数定义、类定义、模块导入，本质上只是完成了变量和对象之间的绑定，或者说我们创建了变量到对象的映射，通过变量可以获取对应的对象，而它们的容身之所就是名字空间。 所以名字空间是通过 PyDictObject 对象实现的，这对于映射来说简直再适合不过了。而前面介绍字典的时候，我们说字典是被高度优化的，原因就是虚拟机本身也重度依赖字典，从这里的名字空间即可得到体现。 当然，在一个模块内部，变量还存在可见性的问题，比如： x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 我们看到同一个变量名，打印的确是不同的值，说明指向了不同的对象，换句话说这两个变量是在不同的名字空间中被创建的。 名字空间本质上是一个字典，如果两者在同一个名字空间，那么由于 key 的不重复性，当执行 x = 2 的时候，会把字典里面 key 为 \"x\" 的 value 给更新成 2。但是在外面还是打印 1，这说明两者所在的不是同一个名字空间，打印的也就自然不是同一个 x。因此对于一个模块而言，内部可以存在多个名字空间，每一个名字空间都与一个作用域相对应。作用域可以理解为一段程序的正文区域，在这个区域里面定义的变量是有意义的，然而一旦出了这个区域，就无效了。 关于作用域这个概念，我们要记住：它仅仅是由源代码的文本所决定。在 Python 中，一个变量在某个位置是否起作用，是由它的文本位置决定的。 因此 Python 具有静态作用域（词法作用域），而名字空间则是作用域的动态体现，一个由程序文本定义的作用域在运行时会转化为一个名字空间、即一个 PyDictObject 对象。比如进入一个函数，显然会进入一个新的作用域，因此函数在执行时，会创建一个名字空间。 在介绍 PyCodeObject 的时候，我们说解释器在对源代码进行编译的时候，对于代码中的每一个 code block，都会创建一个 PyCodeObject 对象与之对应。而当进入一个新的名字空间、或者说作用域时，就算是进入一个新的 block 了。 而根据我们使用 Python 的经验，显然函数、类都是一个新的 block，解释器在执行的时候会为它们创建各自的名字空间。 所以名字空间是名字、或者说变量的上下文环境，名字的含义取决于名字空间。更具体的说，一个变量绑定的对象是不确定的，需要由名字空间来决定。位于同一个作用域的代码可以直接访问作用域中出现的名字，即所谓的直接访问；但不同的作用域，则需要通过访问修饰符 . 进行属性访问。 class A: x = 1 class B: y = 2 print(A.x) # 1 print(y) # 2 如果想在 B 里面访问 A 里面的内容，要通过 A.属性的方式，表示通过 A 来获取 A 里面的属性。但是访问 B 的内容就不需要了，因为都是在同一个作用域，所以直接访问即可。 访问名字这样的行为被称为名字引用，名字引用的规则决定了 Python 程序的行为。 x = 1 def foo(): x = 2 print(x) # 2 foo()\nprint(x) # 1 还是上面的代码，如果我们把函数里面的 x = 2 给删掉，意味着函数的作用域里面已经没有 x 这个变量了，那么再执行程序会有什么结果呢？从 Python 层面来看，显然是会寻找外部的 x。因此我们可以得到如下结论： 作用域是层层嵌套的； 内层作用域可以访问外层作用域； 外层作用域无法访问内层作用域，如果是把外层的 x = 1 给去掉，那么最后面的 print(x) 铁定报错； 查找元素会依次从当前作用域向外查找，也就是查找元素时，对应的作用域是按照从小往大、从里往外的方向前进的；","breadcrumbs":"55. 名字空间：变量的容身之所 » 作用域和名字空间","id":"244","title":"作用域和名字空间"},"245":{"body":"不光函数、类有自己的作用域，模块对应的源文件本身也有相应的作用域。比如： name = \"古明地觉\"\nage = 16 def foo(): return 123 class A: pass 这个文件本身也有自己的作用域，并且是 global 作用域，所以解释器在运行这个文件的时候，也会为其创建一个名字空间，而这个名字空间就是 global 名字空间，即全局名字空间。它里面的变量是全局的，或者说是模块级别的，在当前文件的任意位置都可以直接访问。 而 Python 也提供了 globals 函数，用于获取 global 名字空间。 name = \"古明地觉\" def foo(): pass print(globals())\n\"\"\"\n{..., 'name': '古明地觉', 'foo': <function foo at 0x0000015255143E20>}\n\"\"\" 里面的 ... 表示省略了一部分输出，我们看到创建的全局变量就在里面。而且 foo 也是一个全局变量，它指向一个函数对象。 注意：我们说函数内部是一个独立的 block，因此它会对应一个 PyCodeObject。然后在解释到 def foo 的时候，会根据 PyCodeObject 对象创建一个 PyFunctionObject 对象，然后将 foo 和这个函数对象绑定起来。 当后续调用 foo 的时候，再根据 PyFunctionObject 对象创建 PyFrameObject 对象、然后执行，至于具体细节留到介绍函数的时候再细说。总之，我们看到 foo 也是一个全局变量，全局变量都在 global 名字空间中。并且 global 名字空间全局唯一，它是程序运行时的全局变量和与之绑定的对象的容身之所。你在任何一个位置都可以访问到 global 名字空间，正如你在任何一个位置都可以访问全局变量一样。 另外我们思考一下，global 名字空间是一个字典，全局变量和对象会以键值对的形式存在里面。那如果我手动地往 global 名字空间里面添加一个键值对，是不是也等价于定义一个全局变量呢？ globals()[\"name\"] = \"古明地觉\"\nprint(name) # 古明地觉 def foo1(): def foo2(): def foo3(): globals()[\"age\"] = 16 return foo3 return foo2 foo1()()()\nprint(age) # 16 我们看到确实如此，往 global 名字空间里面插入一个键值对完全等价于定义一个全局变量。并且 global 名字空间是唯一的，你在任何地方调用 globals() 得到的都是 global 名字空间，正如你在任何地方都可以访问到全局变量一样。 所以即使是在函数中给 global 名字空间添加一个键值对，也等价于定义一个全局变量。 问题来了，如果在函数里面，我们不获取 global 名字空间，怎么创建全局变量呢？ name = \"古明地觉\" def foo(): global name name = \"古明地恋\" print(name) # 古明地觉\nfoo()\nprint(name) # 古明地恋 很简单，Python 为我们准备了 global 关键字，表示声明的变量是全局的。","breadcrumbs":"55. 名字空间：变量的容身之所 » global 名字空间","id":"245","title":"global 名字空间"},"246":{"body":"像函数和类拥有的作用域，我们称之为 local 作用域，在运行时会对应 local 名字空间，即局部名字空间。由于不同的函数具有不同的作用域，所以局部名字空间可以有很多个，但全局名字空间只有一个。 对于 local 名字空间来说，它也对应一个字典，显然这个字典就不是全局唯一的了。而如果想获取局部名字空间，Python 也提供了 locals 函数。 def foo(): name = \"古明地觉\" age = 17 return locals() def bar(): name = \"雾雨魔理沙\" age = 18 return locals() print(locals() == globals()) # True\nprint(foo()) # {'name': '古明地觉', 'age': 17}\nprint(bar()) # {'name': '雾雨魔理沙', 'age': 18} 对于模块来讲，它的 local 名字空间和 global 名字空间是一样的，也就是说，模块对应的栈桢对象里面的 f_locals 和 f_globals 指向的是同一个 PyDictObject 对象。但对于函数而言，局部名字空间和全局名字空间就不一样了，调用 locals() 是获取自身的局部名字空间，而不同函数的局部名字空间是不同的。但是 globals() 函数的调用结果是一样的，获取的都是全局名字空间，这也符合函数内不存在指定变量的时候会去找全局变量这一结论。 注：关于 local 名字空间，还有一个重要的细节，全局变量会存储在 global 名字空间中，但局部变量却并不存储在 local 名字空间中。函数有哪些局部变量在编译的时候就已经确定了，会被静态存储在数组中，关于这一点，后续会单独详细说明。","breadcrumbs":"55. 名字空间：变量的容身之所 » local 名字空间","id":"246","title":"local 名字空间"},"247":{"body":"Python 有一个所谓的 LGB 规则，指的是在查找一个变量时，会按照自身的 local 空间、外层的 global 空间、内置的 builtin 空间的顺序进行查找。 builtin 名字空间也是一个字典，当 local 名字空间、global 名字空间都查找不到指定变量的时候，会去 builtin 空间查找。而关于 builtin 空间的获取，Python 提供了一个模块。 # 等价于 __builtins__\nimport builtins\nprint(builtins is __builtins__) # True\nprint(builtins) # <module 'builtins' (built-in)> builtins 是一个模块，那么 builtins.__dict__ 便是 builtin 名字空间，也叫内置名字空间。 import builtins # builtins.list 表示从 builtin 名字空间中查找 list\n# 它等价于 builtins.__dict__[\"list\"]\n# 而如果只写 list，那么由于 local 空间、global 空间都没有\n# 因此最终还是会从 builtin 空间中查找\n# 但如果是 builtins.list，那么就不兜圈子了\n# 表示：\"builtin 空间，就从你这里获取了\"\nprint(builtins.list is list) # True # 将 builtin 空间的 dict 改成 123\nbuiltins.dict = 123\n# 那么此时获取的 dict 就是 123\nprint(dict + 456) # 579 # 如果是 str = 123，等价于创建全局变量 str = 123\nstr = 123\n# 显然影响的是 global 空间\nprint(str) # 123\n# builtin 空间则不受影响\nprint(builtins.str) # <class 'str'>\nprint(builtins.__dict__[\"str\"]) # <class 'str'> 这里提一下在 Python2 中，while 1 比 while True 要快，为什么？ 因为 True 在 Python2 中不是关键字，所以它是可以作为变量名的。那么虚拟机在执行的时候就要先看 local 空间和 global 空间里有没有 True 这个变量，有的话使用我们定义的，没有的话再使用内置的 True。 而 1 是一个常量，直接加载就可以，所以 while True 多了符号查找这一过程。但是在 Python3 中两者就等价了，因为 True 在 Python3 中是一个关键字，也会直接作为一个常量来加载。","breadcrumbs":"55. 名字空间：变量的容身之所 » builtin 名字空间","id":"247","title":"builtin 名字空间"},"248":{"body":"记得之前介绍 exec 和 eval 的时候，我们说这两个函数里面还可以接收第二个参数和第三个参数，它们分别表示 global 名字空间、local 名字空间。 # 如果不指定，默认是当前所在的名字空间\n# 显然此时是全局名字空间\nexec(\"name = '古明地觉'\")\nprint(name) # 古明地觉 # 但我们也可以指定某个名字空间\nnamespace = {}\n# 比如将 namespace 作为全局名字空间\n# 另外这里没有指定第三个参数，也就是局部名字空间\n# 如果指定了第二个参数，但没有指定第三个参数\n# 那么第三个参数默认和第二个参数保持一致\nexec(\"name = 'satori'\", namespace)\nprint(namespace[\"name\"]) # satori 至于 eval 也是同理： namespace = {\"seq\": [1, 2, 3, 4, 5]}\ntry: print(eval(\"sum(seq)\"))\nexcept NameError as e: print(e) # name 'seq' is not defined\n# 告诉我们 seq 没有被定义\n# 如果将 namespace 作为名字空间\nprint(eval(\"sum(seq)\", namespace)) # 15 所以名字空间本质上就是一个字典，所谓的变量不过是字典里面的一个 key。为了进一步加深印象，再举个模块的例子： # 我们自定义一个模块吧\n# 首先模块也是一个对象，类型为 <class 'module'>\n# 但底层没有将这个类暴露给我们，所以需要换一种方式获取\nimport sys\nModuleType = type(sys) # 以上就拿到了模块的类型对象，调用即可得到模块对象\n# 这里我们自定义一个类，继承 ModuleType\nclass MyModule(ModuleType): def __init__(self, module_name): self.module_name = module_name super().__init__(module_name) # 也可以定义一些其它的属性 def __str__(self): return f\"<module '{self.module_name}' from '虚无之境'>\" my_module = MyModule(\"自定义模块\")\nprint(my_module)\n\"\"\"\n<module '自定义模块' from '虚无之境'>\n\"\"\" # 此时的 my_module 啥也没有，我们为其添砖加瓦\nmy_module.__dict__[\"name\"] = \"古明地觉\"\nprint(my_module.name) # 古明地觉 # 给模块设置属性，本质上也是操作模块的属性字典，当然获取属性也是如此\n# 如果再和 exec 结合的话\ncode_string = \"\"\"\nage = 16\ndef foo(): return \"我是函数 foo\" from functools import reduce \"\"\"\n# 将属性设置在模块的属性字典里面\nexec(code_string, my_module.__dict__)\n# 然后我们获取它\nprint(my_module.age) # 16\nprint(my_module.foo()) # 我是函数 foo\nprint(my_module.reduce(int.__add__, range(101))) # 5050 # 是不是很神奇呢？由于 my_module 是一个模块对象\n# 我们还可以将它注入到 sys.modules 中，然后通过 import 获取\nsys.modules[\"俺滴模块\"] = my_module\nfrom 俺滴模块 import name, age, foo\nprint(name) # 古明地觉\nprint(age) # 16\nprint(foo()) # 我是函数 foo 怎么样，是不是很有意思呢？相信你对名字空间已经有了足够清晰的认识，它是变量和与之绑定的对象的容身之所。","breadcrumbs":"55. 名字空间：变量的容身之所 » exec 和 eval","id":"248","title":"exec 和 eval"},"249":{"body":"名字空间是 Python 的灵魂，它规定了一个变量应该如何查找，关于变量查找，下一篇文章来详细介绍，到时你会对名字空间有更加透彻的理解。 然后是作用域，所谓名字空间其实就是作用域的动态体现。整个 py 文件是一个作用域，也是全局作用域；定义函数、定义类、定义方法，又会创建新的作用域，这些作用域层层嵌套。那么同理，运行时的名字空间也是层层嵌套的，形成一条名字空间链。内层的变量对外层是不可见的，但外层的变量对内层是可见的。 然后全局名字空间是一个字典，它是唯一的，操作里面的键值对等价于操作全局变量；至于局部名字空间则不唯一，每一个函数都有自己的局部名字空间，但我们要知道函数内部在访问局部变量的时候是静态访问的（相关细节后续聊）。 还有内置名字空间，可以通过 __builtins__ 获取，但拿到的是一个模块，再获取它的属性字典，那么就是内置名字空间了。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"55. 名字空间：变量的容身之所 » 小结","id":"249","title":"小结"},"25":{"body":"至此，我们算是从解释器的角度完全理清了 Python 中对象之间的关系，用之前的一张图总结一下。 当然，目前还远远没有结束，后续还会针对内置的对象进行专门的剖析，如浮点数、整数、字符串、字节串、元组、列表、字典、集合等等，都会一点一点剖析。我们会从 Python 的角度介绍对象该怎么用，然后再看它的底层实现，最后再用 Python 代码进行验证，加深理解。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"6. 通过 type 和 object 之间的关联，进一步分析类型对象 » 小结","id":"25","title":"小结"},"250":{"body":"上一篇文章我们介绍了名字空间，并且知道了全局变量都存在 global 名字空间中，往 global 空间添加一个键值对相当于定义一个全局变量。那么问题来了，如果往函数的 local 空间里面添加一个键值对，是不是也等价于创建了一个局部变量呢？ def foo(): locals()[\"name\"] = \"古明地觉\" try: print(name) except Exception as e: print(e) foo() # name 'name' is not defined 全局变量的创建是通过向字典添加键值对实现的，因为全局变量会一直变，需要使用字典来动态维护。 但对于函数来讲，内部的变量是通过静态方式存储和访问的，因为局部作用域中存在哪些变量在编译的时候就已经确定了，我们通过 PyCodeObject 的 co_varnames 即可获取内部都有哪些变量。 所以，虽然我们说变量查找遵循 LGB 规则，但函数内部的变量其实是静态访问的，不过完全可以按照 LGB 的方式理解。关于这方面的细节，后续还会细说。 因此名字空间是 Python 的灵魂，它规定了变量的作用域，使得 Python 对变量的查找变得非常清晰。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 楔子","id":"250","title":"楔子"},"251":{"body":"LGB 是针对 Python2.2 之前的，而从 Python2.2 开始，由于引入了嵌套函数，所以内层函数在找不到某个变量时应该先去外层函数找，而不是直接就跑到 global 空间里面找，那么此时的规则就是 LEGB。 x = 1 def foo(): x = 2 def bar(): print(x) return bar foo()()\n\"\"\"\n2\n\"\"\" 调用了内层函数 bar，如果按照 LGB 的规则来查找的话，由于函数 bar 的作用域没有 a，那么应该到全局里面找，打印的结果是 1 才对。 但我们之前说了，作用域仅仅是由文本决定的，函数 bar 位于函数 foo 之内，所以函数 bar 定义的作用域内嵌于函数 foo 的作用域之内。换句话说，函数 foo 的作用域是函数 bar 的作用域的直接外围作用域。所以应该先从 foo 的作用域里面找，如果没有那么再去全局里面找，而作用域和名字空间是对应的，所以最终打印了 2。 另外在调用 foo() 的时候，会执行函数 foo 中的 def bar(): 语句，这个时候解释器会将 a = 2 与函数 bar 捆绑在一起，然后返回，这个捆绑起来的整体就叫做闭包。 所以：闭包 = 内层函数 + 引用的外层作用域。 而这里显示的规则就是 LEGB，其中 E 表示 Enclosing，代表直接外围作用域。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » LEGB 规则","id":"251","title":"LEGB 规则"},"252":{"body":"在初学 Python 时，估计很多人都会对下面的问题感到困惑。 x = 1 def foo(): print(x) foo()\n\"\"\"\n1\n\"\"\" 首先这段代码打印 1，这显然是没有问题的，不过下面问题来了。 x = 1 def foo(): print(x) x = 2 foo() 这段代码在执行 print(x) 的时候是会报错的，会抛出一个 UnboundLocalError: local variable 'x' referenced before assignment，意思是局部变量 x 在赋值之前就被使用了。 那么问题来了，在 print(x) 的下面加一个 x = 2，整体效果不应该是先打印全局变量 x，然后再创建一个局部变量 x 吗？为啥就报错了呢，相信肯定有人为此困惑。如果想弄明白这个错误的原因，需要深刻理解两点： 函数中的变量是静态存储、静态访问的，内部有哪些变量在编译的时候就已经确定； 局部变量在整个作用域内都是可见的； 在编译的时候，因为 x = 2 这条语句，所以知道函数中存在一个局部变量 x，那么查找的时候就会在当前局部作用域中查找，但还没来得及赋值，就 print(x) 了。换句话说，在打印 x 的时候，它还没有和某个具体的值进行绑定，所以报错：局部变量 x 在赋值之前就被使用了。 但如果没有 x = 2 这条语句则不会报错，因为知道局部作用域中不存在 x 这个变量，所以会找全局变量 x，从而打印 1。 更有趣的东西隐藏在字节码当中，我们可以通过反汇编来查看一下： import dis x = 1 def foo(): print(x) dis.dis(foo)\n\"\"\" 6 0 LOAD_GLOBAL 0 (print) 2 LOAD_GLOBAL 1 (x) 4 CALL_FUNCTION 1 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE\n\"\"\" def bar(): print(x) x = 2 dis.dis(bar) \"\"\" 19 0 LOAD_GLOBAL 0 (print) 2 LOAD_FAST 0 (x) 4 CALL_FUNCTION 1 6 POP_TOP 20 8 LOAD_CONST 1 (2) 10 STORE_FAST 0 (x) 12 LOAD_CONST 0 (None) 14 RETURN_VALUE\n\"\"\" 第二列的序号代表字节码指令的偏移量，我们看偏移量为 2 的指令，函数 foo 对应的指令是 LOAD_GLOBAL，意思是在 global 空间中查找 x。而函数 bar 的指令是 LOAD_FAST，表示在数组中静态查找 x，但遗憾的是，此时 x 还没有和某个值进行绑定。 因此结果说明 Python 采用了静态作用域策略，在编译的时候就已经知道变量藏身于何处。而且这个例子也表明，一旦函数内有了对某个变量的赋值操作，它会在整个作用域内可见，因为编译时就已经确定。换句话说，会遮蔽外层作用域中相同的名字。 我们看一下函数 foo 和函数 bar 的符号表。 x = 1 def foo(): print(x) def bar(): print(x) x = 2 print(foo.__code__.co_varnames) # ()\nprint(bar.__code__.co_varnames) # ('x',) 在编译的时候，就知道函数 bar 里面存在局部变量 x。 如果想修复这个错误，可以用之前说的 global 关键字，将变量 x 声明为全局的。 x = 1 def bar(): global x # 表示变量 x 是全局变量 print(x) x = 2 bar() # 1\nprint(x) # 2 但这样的话，会导致外部的全局变量被修改，如果不想出现这种情况，那么可以考虑直接获取全局名字空间。 x = 1 def bar(): print(globals()[\"x\"]) x = 2 bar() # 1\nprint(x) # 1 这样结果就没问题了，同样的，类似的问题也会出现在嵌套函数中。 def foo(): x = 1 def bar(): print(x) x = 2 return bar foo()() 执行内层函数 bar 的时候，print(x) 也会出现 UnboundLocalError，如果想让它不报错，而是打印外层函数中的 x，该怎么做呢？Python 同样为我们准备了一个关键字：nonlocal。 def foo(): x = 1 def bar(): # 使用 nonlocal 的时候，必须是在内层函数里面 nonlocal x print(x) x = 2 return bar foo()() # 1 如果 bar 里面是 global x，那么表示 x 是全局变量，当 foo()() 执行完毕之后，会创建一个全局变量 x = 2。但这里不是 global，而是 nonlocal，表示 x 是外部作用域中的变量，因此会打印 foo 里面的变量 x。 当然啦，既然声明为 nonlocal，那么 foo 里面的 x 肯定会受到影响。 import inspect frame = None def foo(): globals()[\"frame\"] = inspect.currentframe() x = 1 def bar(): nonlocal x # print(x) x = 2 return bar bar = foo()\n# 打印 foo 的局部变量，此时变量 x 的值为 1\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 1}\n\"\"\"\n# 调用内层函数 bar\nbar()\n# 此时 foo 的局部变量 x 的值变成了 2\nprint(frame.f_locals)\n\"\"\"\n{'bar': <function foo.<locals>.bar at 0x7fbe3b8664c0>, 'x': 2}\n\"\"\" 不过由于 foo 是一个函数，调用内层函数 bar 的时候，外层函数 foo 已经结束了，所以不管怎么修改它里面的变量，都无所谓了。 另外上面的函数只嵌套了两层，即使嵌套很多层也是可以的。 import inspect frame = None def a(): def b(): globals()[\"frame\"] = inspect.currentframe() x = 123 def c(): def d(): def e(): def f(): nonlocal x print(x) x = 456 return f return e return d return c return b b = a()\nc = b()\nd = c()\ne = d()\nf = e()\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 123}\n\"\"\"\n# 调用函数 f 的时候，打印的是函数 b 里面的变量 x\n# 当然，最后也会修改它\nf()\n\"\"\"\n123\n\"\"\"\n# 可以看到 x 变成了 456\nprint(frame.f_locals)\n\"\"\"\n{'c': <function a.<locals>.b.<locals>.c at 0x7fbe3b82d670>, 'x': 456}\n\"\"\" 不难发现，在嵌套多层的情况下，会采用就近原则。如果函数 d 里面也定义了变量 x，那么函数 f 里面的 nonlocal x 表示的就是函数 d 里面的局部变量 x。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » global 表达式","id":"252","title":"global 表达式"},"253":{"body":"当我们访问某个变量时，会按照 LEGB 的规则进行查找，而属性查找也是类似的，本质上都是到名字空间中查找一个名字所引用的对象。但由于属性查找限定了范围，所以要更简单，比如 a.xxx，就是到 a 里面去找属性 xxx，这个规则是不受 LEGB 作用域限制的，就是到 a 里面查找，有就是有，没有就是没有。 import numpy as np # 在 np 指向的对象（模块）中查找 array 属性\nprint(np.array([1, 2, 3]))\n\"\"\"\n[1 2 3]\n\"\"\"\n# 本质上就是去 np 的属性字典中查找 key = \"array\" 对应的 value\nprint(np.__dict__[\"array\"]([11, 22, 33]))\n\"\"\"\n[11 22 33]\n\"\"\" class Girl: name = \"古明地觉\" age = 16 print(Girl.name, Girl.age)\n\"\"\"\n古明地觉 16\n\"\"\"\nprint(Girl.__dict__[\"name\"], Girl.__dict__[\"age\"])\n\"\"\"\n古明地觉 16\n\"\"\" 需要补充一点，我们说属性查找会按照 LEGB 规则，但这必须限制在自身所在的模块内，如果是多个模块就不行了。举个例子，假设有两个 py 文件，内容如下： # girl.py\nprint(name) # main.py\nname = \"古明地觉\"\nfrom girl import name 关于模块的导入我们后续会详细说，总之执行 main.py 的时候报错了，提示变量 name 没有被定义，但问题是 main.py 里面定义了变量 name，为啥报错呢？ 很明显，因为 girl.py 里面没有定义变量 name，所以导入 girl 的时候报错了。因此结论很清晰了，变量查找虽然是 LEGB 规则，但不会越过自身所在的模块。print(name) 在 girl.py 里面，而变量 name 定义在 main.py 里面，在导入时不可能跨过 girl.py 的作用域去访问 main.py 里的 name，因此在执行 from girl import name 的时候会抛出 NameError。 虽然每个模块内部的作用域规则有点复杂，因为要遵循 LEGB；但模块与模块的作用域之间则划分得很清晰，就是相互独立。 关于模块，我们后续会详细说。总之通过属性操作符 . 的方式，本质上都是去指定的名字空间中查找对应的属性。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性查找","id":"253","title":"属性查找"},"254":{"body":"自定义的类里面如果没有 __slots__，那么这个类的实例对象会有一个属性字典，和名字空间的概念是等价的。 class Girl: def __init__(self): self.name = \"古明地觉\" self.age = 16 g = Girl()\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16} # 对于查找属性而言, 也是去属性字典中查找\nprint(g.name, g.__dict__[\"name\"]) # 古明地觉 古明地觉 # 同理设置属性, 也是更改对应的属性字典\ng.__dict__[\"gender\"] = \"female\"\nprint(g.gender) # female 当然模块也有属性字典，本质上和类的实例对象是一致的，因为模块本身就是一个实例对象。 print(__builtins__.str) # <class 'str'>\nprint(__builtins__.__dict__[\"str\"]) # <class 'str'> 另外这个 __builtins__ 位于 global 名字空间里面，然后获取 global 名字空间的 globals 又是一个内置函数，于是一个神奇的事情就出现了。 print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"] ) # <module 'builtins' (built-in)> print(globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"]. globals()[\"__builtins__\"].globals()[\"__builtins__\"].list(\"abc\") ) # ['a', 'b', 'c'] global 名字空间和 builtin 名字空间，都保存了指向彼此的指针，所以不管套娃多少次，都是可以的。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 属性空间","id":"254","title":"属性空间"},"255":{"body":"整个内容很好理解，关键的地方就在于局部变量，它是静态存储的，编译期间就已经确定。而在访问局部变量时，也是基于数组实现的静态查找，而不是使用字典。 关于 local 空间，以及如何使用数组实现静态查找，我们后面还会详细说。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"56. 当查找一个变量时，虚拟机会进行哪些动作？ » 小结","id":"255","title":"小结"},"256":{"body":"当解释器启动后，首先会进行运行时环境的初始化，注意这里的运行时环境，它和之前说的执行环境有很大不同，运行时环境是一个全局的概念，而执行环境是一个栈帧。 关于运行时环境的初始化是一个很复杂的过程，涉及到 Python 进程、线程的创建，类型对象的完善等非常多的内容，我们暂时先不讨论。这里就假设初始化动作已经完成，我们已经站在了虚拟机的门槛外面，只需要轻轻推动第一张骨牌，整个执行过程就像多米诺骨牌一样，一环扣一环地展开。 在介绍字节码的时候我们说过，解释器可以看成是：编译器+虚拟机，编译器负责将源代码编译成 PyCodeObject 对象，而虚拟机则负责执行。所以我们的重点就是虚拟机是怎么执行 PyCodeObject 对象的？整个过程是什么，掌握了这些，你对虚拟机会有一个更深的理解。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 楔子","id":"256","title":"楔子"},"257":{"body":"在介绍栈帧的时候我们说过，Python 是一门动态语言，一个变量指向什么对象需要在运行时才能确定，这些信息不可能静态存储在 PyCodeObject 对象中。所以虚拟机在运行时会基于 PyCodeObject 对象动态创建出栈帧对象，然后在栈帧里面执行字节码。而创建栈帧，主要使用以下两个函数： // Python/ceval.c /* 基于 PyCodeObject、全局名字空间、局部名字空间，创建栈帧 * 参数非常简单，所以它一般适用于模块这种参数不复杂的场景 * 前面说了，模块也会对应一个栈帧，并且它位于栈帧链的最顶层 */\nPyObject *\nPyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)\n{ return PyEval_EvalCodeEx(co, globals, locals, (PyObject **)NULL, 0, (PyObject **)NULL, 0, (PyObject **)NULL, 0, NULL, NULL);\n} /* 相比 PyEval_EvalCode 多了很多的参数 * 比如里面有位置参数以及个数，关键字参数以及个数 * 还有默认参数以及个数，闭包等等，显然它用于函数等复杂场景 */\nPyObject *\nPyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, int argcount, PyObject *const *kws, int kwcount, PyObject *const *defs, int defcount, PyObject *kwdefs, PyObject *closure)\n{ return _PyEval_EvalCodeWithName(_co, globals, locals, args, argcount, kws, kws != NULL ? kws + 1 : NULL, kwcount, 2, defs, defcount, kwdefs, closure, NULL, NULL);\n} 我们看到 PyEval_EvalCode 也是调用了 PyEval_EvalCodeEx，后者是通用逻辑，只不过为模块创建栈帧时，参数非常简单，所以又封装了 PyEval_EvalCode 函数。 当然啦，上面这两个函数最终都会调用 _PyEval_EvalCodeWithName 函数，创建并初始化栈帧对象，我们来看一下该函数内部的逻辑。 // Python/ceval.c PyObject *\n_PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals, PyObject *const *args, Py_ssize_t argcount, PyObject *const *kwnames, PyObject *const *kwargs, Py_ssize_t kwcount, int kwstep, PyObject *const *defs, Py_ssize_t defcount, PyObject *kwdefs, PyObject *closure, PyObject *name, PyObject *qualname)\n{ PyCodeObject* co = (PyCodeObject*)_co; PyFrameObject *f; PyObject *retval = NULL; PyObject **fastlocals, **freevars; // ... // 调用 _PyFrame_New_NoTrack 函数创建栈帧 f = _PyFrame_New_NoTrack(tstate, co, globals, locals); if (f == NULL) { return NULL; } fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; // ... // 调用 PyEval_EvalFrameEx 在栈帧中执行字节码 retval = PyEval_EvalFrameEx(f,0); fail: assert(tstate != NULL); if (Py_REFCNT(f) > 1) { Py_DECREF(f); _PyObject_GC_TRACK(f); } else { ++tstate->recursion_depth; Py_DECREF(f); --tstate->recursion_depth; } return retval;\n} 这个函数的逻辑比较长，但做的事情很简单。 调用 _PyFrame_New_NoTrack 函数创建栈帧，并初始化内部字段。 栈帧创建完毕之后，里面的字段都是初始值，所以还要基于当前的 PyCodeObject 对象、位置参数、关键字参数、参数个数等信息修改栈帧字段，而省略掉的大部分代码就是在负责相关逻辑。以上这两步组合起来，就是我们之前说的基于 PyCodeObject 对象构建栈帧对象。 栈帧字段设置完毕之后，调用 PyEval_EvalFrameEx 函数，在栈帧中执行字节码。 当然，PyEval_EvalFrameEx 也不是整个流程的终点，它内部还调用了一个函数。 // Python/ceval.c PyObject *\nPyEval_EvalFrameEx(PyFrameObject *f, int throwflag)\n{ // interp 表示进程状态对象，它的 eval_frame 字段被设置为 _PyEval_EvalFrameDefault // 这个 _PyEval_EvalFrameDefault 函数便是虚拟机运行的核心，是一个代码量超级多的函数 PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE(); return interp->eval_frame(f, throwflag);\n} 所以整个流程很清晰了，我们画一张图。 所以 _PyEval_EvalFrameDefault 函数是虚拟机运行的核心，该函数较为复杂，我们会在下一篇文章中分析它的具体实现。至于本篇文章就先从宏观的角度来描述一下虚拟机执行字节码的流程，并对之前的内容做一个补充，将背后涉及的概念阐述一遍，这样后续看源码的时候也会事半功倍。 首先栈帧中有一个 f_code 字段，它指向 PyCodeObject 对象，该对象的 co_code 字段则保存着字节码指令序列。而虚拟机执行字节码就是从头到尾遍历整个 co_code，对指令逐条执行的过程。 另外也不要觉得字节码指令（简称指令）有多神秘，说白了它就是个 uint8 整数，而一个程序肯定会包含多条指令，它们整体便构成了指令集，或者说指令序列。那么显然，使用 bytes 对象来表示指令序列再合适不过了，如果站在 C 的角度，则就是一个普普通通的字符数组，一条指令就是一个字符、或者说一个整数。 当然指令序列里面包含的不仅仅是指令，还有指令参数，因为每个指令都会带一个参数。因此索引为 0 2 4 6 8 ··· 的整数表示指令，索引为 1 3 5 7 9 ··· 的整数表示指令参数。 我们用 Python 来演示一下： code_string = \"\"\"\na = 1\nb = 2\nc = a + b\n\"\"\" code_object = compile(code_string, \"<file>\", \"exec\")\n# 查看常量池\nprint(code_object.co_consts)\n\"\"\"\n(1, 2, None)\n\"\"\"\n# 查看符号表\nprint(code_object.co_names)\n\"\"\"\n('a', 'b', 'c')\n\"\"\" 这些都比较简单，再来看一下反编译的结果，直接 dis.dis(code_object) 即可。 /* 常量池：(1, 2, None) * 符号表：('a', 'b', 'c') */ // 第一列表示源代码行号\n// 第二列表示指令的偏移量\n// 第三列表示指令，在 C 中它们都是宏，对应一个整数\n// 第四列表示指令参数\n// 第五列是 dis 模块为了方便我们阅读而补充的提示信息 // 指令：LOAD_CONST，指令参数：0\n// 表示从常量池中加载索引为 0 的常量，并压入运行时栈（关于运行时栈，一会儿详细说明）\n// 索引为 0 的常量显然是 1，而括号里面的提示信息显示的也是 1\n2 0 LOAD_CONST 0 (1)\n// 指令：STORE_NAME，指令参数：0\n// 表示从符号表中加载索引为 0 的符号，显然结果是 \"a\"\n// 然后弹出运行时栈的栈顶元素，显然是上一条指令压入的 1\n// 将 \"a\" 和 1 组成键值对，存储在当前的名字空间中\n// 到此 a = 1 这条语句便完成了，或者说完成了变量和值的绑定 2 STORE_NAME 0 (a) // 从常量池中加载索引为 1 的常量（结果是 2），并压入运行时栈 3 4 LOAD_CONST 1 (2)\n// 从符号表中加载索引为 1 的符号（结果是 \"b\")\n// 然后从栈顶弹出元素 2，将 \"b\" 和 2 绑定起来 6 STORE_NAME 1 (b) // 加载符号表中索引为 0 的符号对应的值，并压入运行时栈 4 8 LOAD_NAME 0 (a)\n// 加载符号表中索引为 1 的符号对应的值，并压入运行时栈 10 LOAD_NAME 1 (b)\n// 将运行时栈的两个元素弹出，并执行加法运算\n// 运算之后，再将结果 a + b 压入运行时栈 12 BINARY_ADD\n// 从符号表中加载索引为 2 的符号，结果是 \"c\" // 将运行时栈的栈顶元素弹出，这里是 a + b 的运算结果\n// 然后进行绑定，完成 c = a + b 这条赋值语句 14 STORE_NAME 2 (c)\n// 从常量池中加载索引为 2 的元素并返回，有一个隐式的 return None 16 LOAD_CONST 2 (None) 18 RETURN_VALUE 这些指令的源码实现后续都会说，但是不难发现，程序的主干逻辑都体现在字节码中，而依赖的信息则由其它字段来维护。所谓执行源代码，其实就是虚拟机执行编译之后的字节码，通过遍历 co_code，对不同的指令执行不同的逻辑。 然后我们基于上面这些输出信息，看看能否将字节码指令集还原出来，当然在还原之前首先要知道这些指令代表的数值是多少。 下面我们来进行还原。 \"\"\" 0 LOAD_CONST 0 (1) 2 STORE_NAME 0 (a) 4 LOAD_CONST 1 (2) 6 STORE_NAME 1 (b) 8 LOAD_NAME 0 (a)\n10 LOAD_NAME 1 (b)\n12 BINARY_ADD\n14 STORE_NAME 2 (c)\n16 LOAD_CONST 2 (None)\n18 RETURN_VALUE\n\"\"\"\nBINARY_ADD = 23\nRETURN_VALUE = 83\nSTORE_NAME = 90\nLOAD_CONST = 100\nLOAD_NAME = 101 codes = [ # a = 1 LOAD_CONST, 0, STORE_NAME, 0, # b = 2 LOAD_CONST, 1, STORE_NAME, 1, # c = a + b LOAD_NAME, 0, # 加载 a LOAD_NAME, 1, # 加载 b BINARY_ADD, 0, # 计算 a + b STORE_NAME, 2, # 和变量 c 绑定 # 所有代码块都隐式地包含了一个 return None LOAD_NAME, 2, RETURN_VALUE, 0\n]\nprint(bytes(codes))\n\"\"\"\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02e\\x02S\\x00'\n\"\"\" 那么字节码是不是我们还原的这个样子呢？来对比一下。 >>> code_object.co_code\nb'd\\x00Z\\x00d\\x01Z\\x01e\\x00e\\x01\\x17\\x00Z\\x02d\\x02S\\x00' 结果是一样的，到此相信你对 Python 源代码的执行过程应该有更深的了解了，简单来讲，其实就是以下几个步骤。 1）源代码被编译成 PyCodeObject 对象，该对象的 co_code 字段指向字节码指令序列，它包含了程序执行的主干逻辑，剩余字段则保存常量池、符号表等其它静态信息。 2）虚拟机在 PyCodeObject 对象的基础上构建栈桢对象。 3）虚拟机在栈桢对象内部执行字节码（帧评估），具体流程就是遍历指令集和，根据不同指令执行不同的处理逻辑，而这一过程便由 _PyEval_EvalFrameDefault 函数负责完成。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 虚拟机的运行框架","id":"257","title":"虚拟机的运行框架"},"258":{"body":"之前一直提到一个概念，叫运行时栈，那什么是运行时栈呢？别急，我们先来回顾一下栈桢的基本结构。 大部分字段都很好理解，因为之前通过 Python 代码演示过。但有几个字段是虚拟机用于执行指令的，后续会遇到，所以这里再拿出来解释一下。 f_lasti 上一条刚执行完的字节码指令的偏移量，因为每个指令要带一个参数，所以当虚拟机要执行偏移量为 n 的指令时，那么 f_lasti 就是 n - 2。当然，如果字节码还没有开始执行，那么 f_lasti 为 -1。 f_localsplus 一个柔性数组，它的内存大小被分为 4 个部分。 注：f_localsplus 是一个数组，所以它是一段连续的内存，只不过按照用途被分成了 4 个部分。如果用新一团团长丁伟的说法：每个部分之间是鸡犬相闻，但又老死不相往来。 然后再着重强调一下运行时栈，虚拟机在执行字节码指令时高度依赖它，因为一个指令只能带一个参数，那么剩余的参数就必须通过运行时栈给出。比如 a = 1 会对应两条字节码：LOAD_CONST 和 STORE_NAME。 STORE_NAME 的作用是从符号表中获取符号，或者说变量名，然后和值绑定起来。而要加载符号，那么必须要知道它在符号表中的索引，显然这可以通过指令参数给出，但问题是与之绑定的值怎么获取？毫无疑问，要通过运行时栈。因此 LOAD_CONST 将值读取进来之后，还要压入运行时栈，然后 STORE_NAME 会将值从运行时栈中弹出，从而完成符号（变量）和值的绑定。 关于运行时栈，我们再看个复杂的例子： 偏移量为 6 的指令表示要构建一个字典，指令参数 2 表示构建的字典的长度为 2，但问题是字典的键值对在什么地方？显然它们已经被提前压入了运行时栈，执行 BUILD_CONST_KEY_MAP 的时候直接弹出即可。 所以这就是运行时栈的作用，如果某个指令需要 n 个参数，那么其中的 n - 1 个必须要提前压入运行时栈，然后在该指令执行的时候依次弹出，因为一个指令只能带一个参数。 f_stacktop 一个指针，指向运行时栈的栈顶。由于运行时栈存储的都是 PyObject *，所以 f_stacktop 的类型是 PyObject **。当然在源码中没有直接操作 f_stacktop 字段，而是定义了一个变量 stack_pointer，它初始等于 f_stacktop。后续操作的都是 stack_pointer，当然操作完之后，还要重新赋值给 f_stacktop。 所以 stack_pointer 始终指向运行时栈的栈顶，而元素的入栈和出栈，显然都是通过操作 stack_pointer 完成的。 执行 *stack_pointer++ = v，一个元素就入栈了。 执行 v = *--stack_pointer，一个元素就出栈了。 而随着元素的入栈和出栈，运行时栈的栈顶、或者说 stack_pointer 也在不断变化，但无论如何，stack_pointer 始终指向运行时栈的栈顶。当然啦，由于栈顶发生变化，后续还要对 f_stacktop 进行更新。 f_valuestack 一个指针，指向运行时栈的栈底。 另外我们说 f_localsplus 数组被分成了 4 份，最后一份给了运行时栈，因此虽然我们称之为栈，但它其实就是一个数组，而且还是数组的一部分。 而对于数组而言，内存地址从左往右是增大的。 这是 f_localsplus 的示意图，灰色区域表示运行时栈之前的部分，这里我们只看运行时栈，目前栈里面有两个元素，stack_pointer 指向栈顶。 这时如果要添加一个元素 3，那么直接 *stack_pointer++ = 3 即可。 如果要将栈顶元素弹出，那么执行 v = *--stack_pointer 即可。 还是比较清晰的，不过还没结束，我们还要继续探讨运行时栈。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 什么是运行时栈","id":"258","title":"什么是运行时栈"},"259":{"body":"相信你已经知道什么是运行时栈了，说白了它就是参数的容身之所，比如虚拟机在执行 a + b 的时候，通过指令和指令参数可以判断这是一个加法操作，但在执行加法的时候，加号两边的值要怎么获取呢？这时候就需要一个栈来专门保存相应的参数。在执行加法之前，先将 a 和 b 压入栈中，等执行加法的时候，再将 a 和 b 从栈里面弹出来即可，非常简单。 然后再来看看和运行时栈相关的一些宏，并加深对运行时栈的理解。 // Python/ceval.c #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))\n#define EMPTY() (STACK_LEVEL() == 0)\n#define TOP() (stack_pointer[-1])\n#define SECOND() (stack_pointer[-2])\n#define THIRD() (stack_pointer[-3])\n#define FOURTH() (stack_pointer[-4])\n#define PEEK(n) (stack_pointer[-(n)])\n#define SET_TOP(v) (stack_pointer[-1] = (v))\n#define SET_SECOND(v) (stack_pointer[-2] = (v))\n#define SET_THIRD(v) (stack_pointer[-3] = (v))\n#define SET_FOURTH(v) (stack_pointer[-4] = (v))\n#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))\n#define BASIC_STACKADJ(n) (stack_pointer += n)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v))\n#define BASIC_POP() (*--stack_pointer) #define PUSH(v) BASIC_PUSH(v)\n#define POP() BASIC_POP()\n#define STACK_GROW(n) BASIC_STACKADJ(n)\n#define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER)) 宏还是比较多的，我们来逐一介绍。假设目前运行时栈内部有三个元素，从栈底到栈顶分别是整数 1、2、3，那么运行时栈的结构就是下面这样。 f_localsplus 数组被分成 4 个区域，运行时栈占据最后一个，因此图中的灰色区域便是运行时栈之前的内存。由于我们是研究运行时栈，所以这部分区域后续就不再画了。 然后看一下这些和运行时栈相关的宏都是干嘛的。 STACK_LEVEL() 返回运行时栈的元素个数，显然直接让栈顶指针和栈底指针相减就完事了。 #define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack)) 所以 STACK_LEVEL() 是会动态变化的，因为 stack_pointer 会动态变化。 记得之前在介绍 PyCodeObject 时，我们说它内部的 co_stacksize 字段表示执行代码块所需要的栈空间，而这个栈空间就是运行时栈的长度。当然也可以理解为要想执行这段代码块，后续创建栈桢时，应该给 f_localsplus 数组中表示运行时栈的区域分配能存储多少个元素的内存。 比如 co_stacksize 是 1，那么表示应该给运行时栈分配能存储 1 个元素的内存，即运行时栈的长度为 1。 STACK_LEVEL() 表示当前运行时栈已存储的元素数量，而 co_stacksize 表示运行时栈的长度，即最多能存储多少个元素。 我们通过反编译的方式，实际演示一下。 import dis def some_func(): a = 1 b = 2 c = 3 # 这里只保留字节码指令\ndis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 也就是说，运行时栈只要能容纳一个元素，即可执行这段代码\nprint(some_func.__code__.co_stacksize) # 1 我们再来看个例子。 import dis def some_func(): a = 1 b = 2 c = 3 lst = [a, b, c] dis.dis(some_func)\n\"\"\"\nLOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1 STORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 1\nLOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 2 LOAD_FAST # 将元素压入运行时栈，栈里的元素个数为 3\nBUILD_LIST # 将栈里的三个元素弹出，构建列表并入栈（此时元素个数为 1）\nSTORE_FAST # 将元素从栈顶弹出，栈里的元素个数为 0 LOAD_CONST # 将元素压入运行时栈，栈里的元素个数为 1\nRETURN_VALUE # 将元素从栈顶弹出，栈里的元素个数为 0\n\"\"\" # 不难看出，要想执行这段代码，运行时栈要能容纳 3 个元素\nprint(some_func.__code__.co_stacksize) # 3 相信你现在应该理解 co_stacksize 的作用了，它表示运行时栈最多能容纳多少个元素，也就是运行时栈的长度。以上面代码为例，由于最多会压入 3 个元素，所以运行时栈的长度就是 3，即最多能容纳 3 个元素。并且这个长度在编译之后就已经确定了，因为可以通过遍历指令集静态计算出来。 我们画一张图描述一下上面的代码在执行时，运行时栈的变化过程。 整个过程应该很清晰，当然上面只是运行时栈的变化，f_localsplus 中存储局部变量的内存区域也在变化。另外如果代码块位于全局作用域，那么变化的就是全局名字空间，相关细节后续详细展开。 EMPTY() #define EMPTY() (STACK_LEVEL() == 0) 判断运行时栈是否为空，显然只需判断运行时栈的元素个数是否为 0 即可。 TOP() #define TOP() (stack_pointer[-1]) 查看当前运行时栈的栈顶元素。 SECOND() #define SECOND() (stack_pointer[-2]) 查看从栈顶元素开始的第二个元素。 THIRD() #define THIRD() (stack_pointer[-3]) 查看从栈顶元素开始的第三个元素。 FOURTH() #define FOURTH() (stack_pointer[-4]) 查看从栈顶元素开始的第四个元素。 PEEK(n) #define PEEK(n) (stack_pointer[-(n)]) 查看从栈顶元素开始的第 n 个元素。 SET_TOP(v) #define SET_TOP(v) (stack_pointer[-1] = (v)) 将当前运行时栈的栈顶元素设置成 v。 SET_SECOND(v) #define SET_SECOND(v) (stack_pointer[-2] = (v)) 将从栈顶元素开始的第二个元素设置成 v。 SET_THIRD(v) #define SET_THIRD(v) (stack_pointer[-3] = (v)) 将从栈顶元素开始的第三个元素设置成 v。 SET_FOURTH(v) #define SET_FOURTH(v) (stack_pointer[-4] = (v)) 将从栈顶元素开始的第四个元素设置成 v。 SET_VALUE(n, v) #define SET_VALUE(n, v) (stack_pointer[-(n)] = (v)) 将从栈顶元素开始的第 n 个元素设置成 v。 PUSH(v) #define PUSH(v) BASIC_PUSH(v)\n#define BASIC_PUSH(v) (*stack_pointer++ = (v)) 往运行时栈中压入一个元素，并且压入之后，栈中已存储的元素个数一定不超过 co_stacksize。假设当前栈里有一个元素 1，然后添加一个元素 2。 Python 的变量都是一个指针，所以 stack_pointer 是一个二级指针，它永远指向栈顶位置，只不过栈顶位置会变。另外要注意：运行时栈的内存一开始就申请好了，初始状态下，里面的元素全部为 NULL。而往栈里面压入一个元素，其实就是修改 stack_pointer 指向的内存单元，然后执行 stack_pointer++。 POP() #define POP() BASIC_POP()\n#define BASIC_POP() (*--stack_pointer) 弹出栈顶元素，注意它和 TOP 的区别，TOP 是返回栈顶元素，但不弹出。 stack_pointer 指向栈顶位置，所以它向栈底移动一个位置，就相当于元素被弹出了。 关于弹出元素需要做一个说明，所谓弹出元素本质上就是将 stack_pointer 向栈底移动一个位置。我们看一下上图，一开始栈里面有两个元素，分别是整数 1 和整数 2，当然准确来说应该是指向它们的指针，但为了描述方便，我们就用对象本身代替了。 然后执行 POP()，将整数 2 弹出，但我们发现 POP() 之后，整数 2 还在栈里面。关于这一点很好理解，因为 stack_pointer 始终指向栈顶位置，而它向栈底移动了一个位置，那么整数 2 就已经不是栈顶元素了。当下一个元素入栈时，会把整数 2 替换掉。因此虽然整数 2 还在运行时栈里面，但和不在没有任何区别，此时我们依旧认为整数 2 被弹出了。 不过在后续的文章中，在画运行时栈的时候，我们也会这么画。 为了阅读清晰，stack_pointer 之后的元素就不写了。另外还要注意一点，运行时栈的内存一开始就已经申请好了，是固定的，弹出元素只是改变栈顶指针 stack_pointer 的指向，而内存区域的大小是不变的。 当然这些内容都比较简单，但为了避免出现歧义，这里单独解释一下。 STACK_GROW(n) #define STACK_GROW(n) BASIC_STACKADJ(n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 改变运行时栈的栈顶，注：运行时栈的大小是固定的，但栈顶是由 stack_pointer 决定的。 那么问题来了，假设要往运行时栈压入两个元素，分别是 2、3，该怎么做呢？首先肯定可以通过 PUSH 实现。 PUSH(2);\nPUSH(3); 但如果不让你用 PUSH，该怎么做呢？ STACK_GROW(2);\n// 设置元素\nSET_VALUE(1, 3); // stack_pointer[-1] = 3\nSET_VALUE(2, 2); // stack_pointer[-2] = 2 两种做法都是可以的。 STACK_SHRINK(n) #define STACK_SHRINK(n) BASIC_STACKADJ(-n)\n#define BASIC_STACKADJ(n) (stack_pointer += n) 它的作用和 STACK_GROWN 正好相反。 注意：STACK_SHRINK(3) 之后，stack_pointer 和 f_valuestack 都指向了运行时栈的栈底，同时也是栈顶。还是之前说的，栈空间是固定的，但栈顶会随着元素的入栈和出栈而动态变化。 另外，对于当前示例来说，如果你不关注栈里的元素的话，那么执行 STACK_SHRINK(3) 和执行三次 POP() 是等价的。当然不管是哪种情况，最终栈里的元素都还是 1、2、3，因为弹出元素只是改变栈顶指针 stack_pointer 的指向，而不会修改栈里的元素。当然啦，既然栈顶是由 stack_pointer 决定的，而它目前指向了栈底位置，所以我们可以认为此时栈是空的。 这么画似乎更清晰一些，但我们要知道这背后的整个过程。另外还要再次强调，运行时栈只是数组 f_localsplus 的一部分，并且是最后一部分，所以它的内存空间事先就申请好了，里面的每个元素都是 NULL。所谓添加元素，就是修改 stack_pointer 指针指向的内存，然后 stack_pointer++。所谓弹出元素，就是 stack_pointer--，然后返回 stack_pointer 指向的内存。 以上就是运行时栈的一些宏，后续阅读源码的时候，会经常遇到。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 运行时栈的一些宏","id":"259","title":"运行时栈的一些宏"},"26":{"body":"本篇文章来聊一聊对象的创建，一个对象是如何从无到有产生的呢？ >>> n = 123\n>>> n\n123 比如在终端中执行 n = 123，一个整数对象就创建好了，但它的背后都发生了什么呢？带着这些疑问，开始今天的内容。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"26","title":"楔子"},"260":{"body":"本篇文章我们就从宏观的角度介绍了虚拟机执行字节码的流程，说白了虚拟机就是把自己当成一个 CPU，在栈桢中执行指令。通过遍历字节码指令集，对不同的指令执行不同的处理逻辑。 然后是运行时栈，因为一个指令只能带一个参数，那么剩余的参数就需要通过运行时栈给出。比如 LOAD_CONST 指令，它在加载完常量之后，会将常量压入运行时栈，然后 STORE_NAME 或 STORE_FAST 指令再将常量从运行时栈的顶部弹出，并和某个符号（变量）绑定起来。 关于这些指令，我们后面会详细说。 最后我们介绍了运行时栈的一些宏，因为执行指令的时候会反复操作运行时栈，所以底层封装了很多的宏。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"57. 虚拟机是怎么执行字节码的？背后都经历了哪些过程 » 小结","id":"260","title":"小结"},"261":{"body":"上一篇文章我们介绍了虚拟机是怎么执行字节码指令的，并且还介绍了运行时栈，以及操作运行时栈的一些宏。相信你对字节码执行的整个流程应该有了清晰的认识，那么接下来我们就深入到源码中，进一步考察执行过程。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 楔子","id":"261","title":"楔子"},"262":{"body":"之前说了，虚拟机就是把自己当成一个 CPU，在栈帧中执行字节码，面对不同的字节码指令，执行不同的处理逻辑。 具体实现由 Python/ceval.c 中的 _PyEval_EvalFrameDefault 函数负责，该函数超级长，并且里面还包含了大量的宏，这些宏完全可以定义在其它的文件中。像我们之前介绍的操作运行时栈的宏，也定义在 _PyEval_EvalFrameDefault 函数里面了。所以为了方便大家理解，我决定先介绍里面出现的宏，等宏说完了之后再看具体的逻辑。 #ifdef HAVE_COMPUTED_GOTOS #ifndef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 1 #endif\n#else #if defined(USE_COMPUTED_GOTOS) && USE_COMPUTED_GOTOS #error \"Computed gotos are not supported on this compiler.\" #endif #undef USE_COMPUTED_GOTOS #define USE_COMPUTED_GOTOS 0\n#endif // 如果使用 \"计算跳转\"，导入静态跳转表\n#if USE_COMPUTED_GOTOS\n/* Import the static jump table */\n#include \"opcode_targets.h\" 里面出现了一个关键词：计算跳转，这是什么意思呢？ 首先 _PyEval_EvalFrameDefault（后续简称为帧评估函数）的代码量虽然很大，但它的核心不难理解，就是循环遍历字节码指令集，处理每一条指令。而当一条指令执行完毕时，虚拟机会有以下三种动作之一： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，比如执行 GET_ITER 指令，但对象不具备可迭代的性质。那么要进行异常处理（或者直接抛出异常），然后退出帧评估函数。 执行下一条指令。 前面两种动作没啥好说的，关键是第三种，如何执行下一条指令。首先虚拟机内部有一个巨型的 switch 语句，伪代码如下： int opcode;\nint oparg; for (;;) { // 循环遍历指令集，获取指令和指令参数 opcode = ...; // 指令 oparg = ...; // 指令参数 // 执行对应的处理逻辑 switch (opcode) { case LOAD_CONST: 处理逻辑; case LOAD_FAST: 处理逻辑; case LOAD_FAST: 处理逻辑; case BUILD_LIST: 处理逻辑; case DICT_UPDATE: 处理逻辑; // ... }\n} 一个 case 分支，对应一个字节码指令的实现，由于指令非常多，所以这个 switch 语句也非常庞大。然后遍历出的指令，会进入这个 switch 语句进行匹配，执行相应的处理逻辑。所以循环遍历 co_code 得到字节码指令，然后交给内部的 switch 语句、执行匹配到的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 其实到这里，你应该已经了解了帧评估函数的整体结构。说白了就是将自己当成一个 CPU，在栈帧中执行一条条指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。因此在虚拟机的执行流程进入了那个巨大的 for 循环，并取出第一条字节码指令交给里面的 switch 语句之后，第一张多米诺骨牌就已经被推倒，命运不可阻挡的降临了。一条接一条的指令如同潮水般涌来，浩浩荡荡，横无际涯。 虽然在概念上很好理解，但很多细节被忽略掉了，本篇文章就将它们深挖出来。还是之前的问题，当一个指令执行完毕时，怎么执行下一条指令。 估计有人对这个问题感到奇怪，在 case 分支的内部加一行 continue 进行下一轮循环不就行了吗？没错，这种做法是行得通的，但存在性能问题。因为 continue 会跳转到 for 循环所在位置，所以遍历出下一条指令之后，会再次进入 switch 语句进行匹配。尽管逻辑上是正确的，但 switch 里面有数百个 case 分支，如果每来一个指令，都要顺序匹配一遍的话，那么效率必然不高。 而事实上整个字节码指令集是已知的，所以不管执行哪个指令，我们都可以提前得知它的下一个指令，只需将指针向后偏移两个字节即可。 那么问题来了，既然知道下一条要执行的指令是什么，那么在当前指令执行完毕时，可不可以直接跳转到下一条指令对应的 case 分支中呢？ 答案是可以的，这个过程就叫做计算跳转，通过标签作为值即可实现。关于什么是标签作为值，我们用一段 C 代码解释一下。 #include <stdio.h> void label_as_value(int jump) { int num = 4; void *label; switch (num) { case 1: printf(\"%d\\n\", 1); break; // 在 case 2 分支里面定义了一个标签叫 two case 2: two: { printf(\"%d\\n\", 2); break; } // 在 case 3 分支里面定义了一个标签叫 three case 3: three: { printf(\"%d\\n\", 3); break; } case 4: printf(\"%d\\n\", 4); // 如果参数 jump 等于 2，保存 two 标签的地址 // 如果参数 jump 等于 3，保存 three 标签的地址 if (jump == 2) label = &&two; else if (jump == 3) label = &&three; // 跳转到指定标签 goto *label; default: break; }\n} int main() { label_as_value(2); // 4 // 2 label_as_value(3); // 4 // 3\n} 由于变量 num 等于 4，所以会进入 case 4 分支，在里面有一个 goto *label。如果你对 C 不是特别熟悉的话，估计会有些奇怪，觉得不应该是 goto label 吗？如果是 goto label，那么需要显式地定义一个名为 label 的标签，但这里并没有。我们的目的是跳转到 two 标签或 three 标签，具体跳转到哪一个，则由参数控制。因此可以使用 && 运算符，这是 GCC 的一个扩展特性，叫做标签作为值，它允许我们获取标签的地址作为一个值。 所以在开头声明了一个 void *label，然后让 label 保存标签地址，再通过 goto *label 跳转到指定标签。由于 *label 代表哪个标签是在运行时经过计算才能知晓，因此称为计算跳转（在运行时动态决定跳转目标）。 注意：goto *&&标签名 属于高级的、非标准的 C 语言用法。 那么毫无疑问，解释器也一定为处理指令的 case 分支定义了相应的标签，并拿到了这些标签的地址。没错，这些标签地址位于 Python/opcode_targets.h 中，这个 opcode_targets.h 就是上面的帧评估函数导入的头文件。 每个指令的处理逻辑都会对应一个标签，这些标签的地址全部保存在了数组中，执行帧评估函数时导入进来即可。这里可能有人会问，导入数组时，它里面的标签都还没有定义吧。确实如此，不过没关系，对于 C 来说，标签只要定义了，那么它在函数的任何一个位置都可以使用。 假设要执行的下一条指令为 opcode，那么就会跳转到 *opcode_targets[opcode]，因此我们有理由相信，指令和 opcode_targets 数组的索引之间存在某种关联。而这种关联也很好想，opcode_targets[opcode] 指向的标签，其内部的逻辑就是用来处理 opcode 指令的，我们来验证一下。 #define LOAD_CONST 100\n#define LOAD_NAME 101 比如 LOAD_CONST 的值为 100，那么 opcode_targets[100] 肯定会指向 TARGET_LOAD_CONST 标签；LOAD_NAME 的值为 101，那么 opcode_targets[101] 肯定会指向 TARGET_LOAD_NAME 标签。 结果没有问题，其它指令也是一样的，通过计算跳转，可以直接 goto 到指定的标签。 好，我们总结一下，首先帧评估函数内部有一个巨型的 switch，每一个指令的处理逻辑都对应一个 case 分支，由于指令有一百多个，所以 case 分支也有一百多个。而当指令进入 switch 后，显然会顺序匹配这一百多个 case 分支，找到符合条件的那一个。 整个过程的逻辑是没问题的，但效率上还可以更进一步优化，因为整个字节码指令集是已知的，既然都提前知道了下一条待处理的指令是什么，那完全可以直接跳转到对应的 case 分支中。所以每个 case 分支都会对应一个标签，我们看一下源码。 这个 TARGET 是一个宏，也定义在帧评估函数中。 #define TARGET(op) \\ op: \\ TARGET_##op // 所以 case TARGET(LOAD_CONST): 展开之后就会变成\n// case LOAD_CONST: TARGET_LOAD_CONST: 所以在指令的名称前加一个 TARGET_ 就是对应的标签，比如下一条要执行的指令是 YIELD_VALUE，它等于 86，那么 opcode_targets[86] 就等于 &&TARGET_YIELD_VALUE，指向的标签内部便是 YIELD_VALUE 的处理逻辑，至于其它指令也是同理。 因此读取完下一条指令之后，就不用跳转到开头重新走一遍 switch 了。而是将指令作为索引，从 opcode_targets 拿到标签地址直接跳转即可，并且跳转后的标签内部的逻辑就是用来处理该指令的。 所以底层为每个指令的处理逻辑都定义了一个标签，而标签的地址在数组中的索引，和要处理的指令本身是相等的。 不过要想实现计算跳转，需要 GCC 支持标签作为值这一特性，即 goto *标签地址，至于标签地址是哪一个标签的地址，则在运行时动态计算得出。比如 opcode_targets[opcode] 指向哪个标签无从得知，这取决于 opcode 的值。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 以上就是计算跳转，我们继续往下说。 // 如果使用了计算跳转\n#define FAST_DISPATCH() \\ { \\ if (!_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \\ f->f_lasti = INSTR_OFFSET(); /* 将当前指令的偏移量赋值给 f_lasti */ \\ NEXTOPARG(); /* 获取下一条指令 */ \\ goto *opcode_targets[opcode]; /* 跳转到对应的标签中 */ \\ } \\ goto fast_next_opcode; \\ } #define DISPATCH() \\ { \\ if (!_Py_atomic_load_relaxed(eval_breaker)) { \\ FAST_DISPATCH(); \\ } \\ continue; \\ } #define TARGET(op) \\ op: \\ TARGET_##op // 如果不使用计算跳转\n#define TARGET(op) op\n#define FAST_DISPATCH() goto fast_next_opcode\n#define DISPATCH() continue 每条指令在执行的最后，都会调用 DISPATCH() 或 FAST_DISPATCH()，我们看一下源码。 如果不使用计算跳转，那么 DISPATCH() 就等价于 continue，直接进行下一轮 for 循环，然后进入 switch。而 FAST_DISPATCH() 会跳转到 fast_next_opcode 标签，该标签定义在 for 循环的里面，switch 的外面，所以它虽然不用从 for 循环的位置开始执行，但依然要走一遍完整的 switch。另外由于不使用计算跳转，那么 case 分支里的标签也就没意义了，所以 case TARGET(op) 就等价于 case op。 如果使用计算跳转，那么就是之前说的那样，在指令执行完之后（并且没有中断请求）会调用 NEXTOPARG() 获取下一条指令，然后通过 goto *opcode_targets[opcode] 实现计算跳转，直接跳到下一条指令对应的 case 分支中，从而省去了匹配的时间。 好，我们继续往下看。 // 获取元组 v 中索引为 i 的元素\n#define GETITEM(v, i) PyTuple_GetItem((v), (i)) /* 在遍历字节码指令序列时，会用到以下两个变量 * first_instr：永远指向字节码指令序列的第一条指令 * next_instr：永远指向下一条待执行（或正在执行）的字节码指令 * 另外由于每条字节码指令都会带有一个参数 * 所以 first_instr 和 next_instr 的类型都是 _Py_CODEUNIT *，即 uint16_t * * 其中前 8 位表示指令，后 8 位表示指令参数 */ // 在调用 NEXTOPARG() 之前，next_instr 指向正在执行的字节码指令\n// 如果调用了 NEXTOPARG()，那么 next_instr 就会指向下一条待执行的字节码指令\n// 该宏计算的显然就是它和第一条指令（或者说字节码指令序列的起始位置）之间的偏移量\n#define INSTR_OFFSET() \\ (sizeof(_Py_CODEUNIT) * (int)(next_instr - first_instr)) // 获取 next_instr 指向的 uint16 的前 8 位和后 8 位，也就是拿到指令和指令参数\n// 然后执行 next_instr++\n#define NEXTOPARG() do { \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ } while (0) 通过 INSTR_OFFSET 和 NEXTOPARG，我们介绍了两个指针变量：first_instr 和 next_instr，虚拟机就是通过它们来完成遍历的。 #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个指令等到介绍 if 控制流的时候再说，不过相信你也能猜到它是做什么的，if 控制流的某个分支如果不满足条件，就会跳到下一个分支。而这个跳转过程是怎么实现的呢？显然要借助于这里的 JUMPTO 和 JUMPBY。 // 指令预测\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif\n#define PREDICTED(op) PRED_##op: PREDICT 宏和指令预测相关，后续介绍 if 控制流的时候再说。 关于宏就说到这里，至于剩下的一些宏，暂时就先不用看了，我们在后续的部分才会用到它们。 好，既然宏说完了，接下来我们可以看整个帧评估函数都做些什么了，代码有删减。 PyObject* _Py_HOT_FUNCTION\n_PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)\n{ // 初始化一些变量，它们的含义等赋值的时候再说 PyObject **stack_pointer; const _Py_CODEUNIT *next_instr; int opcode; int oparg; PyObject **fastlocals, **freevars; PyObject *retval = NULL; _PyRuntimeState * const runtime = &_PyRuntime; PyThreadState * const tstate = _PyRuntimeState_GetThreadState(runtime); struct _ceval_runtime_state * const ceval = &runtime->ceval; _Py_atomic_int * const eval_breaker = &ceval->eval_breaker; PyCodeObject *co; int instr_ub = -1, instr_lb = 0, instr_prev = -1; const _Py_CODEUNIT *first_instr; PyObject *names; PyObject *consts; _PyOpcache *co_opcache; // ... // 省略了一堆的宏定义，就是我们上面刚介绍的 // ... // 检查是否超过递归深度限制 if (Py_EnterRecursiveCall(\"\")) return NULL; // tstate->frame 保存当前正在执行的栈桢，所以将 f 赋值给 tstate->frame // 至于之前的 tstate->frame，则保存在 f.f_back 字段中（在创建栈桢 f 的时候就完成了） tstate->frame = f; // 如果启用追踪机制 if (tstate->use_tracing) { // tstate->c_tracefunc 对应 Python 里的 sys.settrace // 如果不为空，那么进行调用 // 该函数可以监控每行代码的执行，因此一般用于调试器 if (tstate->c_tracefunc != NULL) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } // tstate->c_profilefunc 对应 Python 里的 sys.setprofile // 如果不为空，那么进行调用，该函数主要用于性能分析 if (tstate->c_profilefunc != NULL) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_CALL, Py_None)) { goto exit_eval_frame; } } } // DTrace 是一个强大的动态追踪工具 // 这里检测是否启用了 DTrace 的函数入口探针 if (PyDTrace_FUNCTION_ENTRY_ENABLED()) // 如果启用了 DTrace，则记录函数进入的事件 dtrace_function_entry(f); // 获取栈桢内部的关键字段 co = f->f_code; names = co->co_names; consts = co->co_consts; fastlocals = f->f_localsplus; freevars = f->f_localsplus + co->co_nlocals; assert(PyBytes_Check(co->co_code)); assert(PyBytes_GET_SIZE(co->co_code) <= INT_MAX); assert(PyBytes_GET_SIZE(co->co_code) % sizeof(_Py_CODEUNIT) == 0); assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(co->co_code), sizeof(_Py_CODEUNIT))); // 注意这里的 first_instr，上面已经介绍了，它指向字节码指令序列的起始位置，或者说第一条指令 first_instr = (_Py_CODEUNIT *) PyBytes_AS_STRING(co->co_code); assert(f->f_lasti >= -1); // 初始状态下，next_instr 和 first_instr 相等 next_instr = first_instr; if (f->f_lasti >= 0) { assert(f->f_lasti % sizeof(_Py_CODEUNIT) == 0); next_instr += f->f_lasti / sizeof(_Py_CODEUNIT) + 1; } stack_pointer = f->f_stacktop; assert(stack_pointer != NULL); f->f_stacktop = NULL; f->f_executing = 1; // 进入主循环，在这个 for 循环里面一会儿就会看到那个巨型的 switch main_loop: // 遍历字节码指令集，处理每一条指令 for (;;) { // stack_pointer 是栈顶指针，f_valuestack 是栈底指针 // 由于 Python 的运行时栈是基于数组实现的，所以从栈底到栈顶，地址是增大的 // 因此 stack_pointer 一定大于等于 f_valuestack assert(stack_pointer >= f->f_valuestack); // STACK_LEVEL() 一定小于等于运行时栈的长度，之前说过的 assert(STACK_LEVEL() <= co->co_stacksize); // 线程状态对象里面没有异常产生 assert(!_PyErr_Occurred(tstate)); // 检测是否有待处理的中断（比如信号、GIL 释放请求等） if (_Py_atomic_load_relaxed(eval_breaker)) { opcode = _Py_OPCODE(*next_instr); /* 如果指令是以下之一，那么忽略中断，直接跳到 fast_next_opcode 标签进行处理 * SETUP_FINALLY：try / finally 语句的开始 * SETUP_WITH：with 语句的开始 * BEFORE_ASYNC_WITH：async with 语句的开始 * YIELD_FROM：yield from 表达式 */ // 这种设计主要是为了确保在某些关键操作（如资源管理、异常处理、异步操作）的开始阶段不被中断信号打断 // 从而保证这些操作的正确性和可靠性，进而保证 Python 程序的稳定性和可预测性 if (opcode == SETUP_FINALLY || opcode == SETUP_WITH || opcode == BEFORE_ASYNC_WITH || opcode == YIELD_FROM) { goto fast_next_opcode; } // 使用原子操作检查是否有待处理的信号 // 如果有待处理的信号，那么调用 handle_signals 函数处理它们 // 这个机制允许 Python 程序响应外部事件和系统信号，同时保证执行的正确性 if (_Py_atomic_load_relaxed(&ceval->signals_pending)) { if (handle_signals(runtime) != 0) { goto error; } } // 通过原子操作检查是否有待处理的调用需要执行，calls_to_do 是一个计数器，表示待处理的调用的数量 // 如果有待处理的调用，那么执行 make_pending_calls 函数 // pending calls 主要用于垃圾回收（GC）、异步 IO 回调、定时器事件等 // 这个机制是 Python 运行时系统的重要组成部分，允许虚拟机在主循环中处理各种异步任务和周期性任务 // 确保各种后台任务能够得到及时处理，并且不需要使用额外的线程和复杂的调度机制 if (_Py_atomic_load_relaxed(&ceval->pending.calls_to_do)) { if (make_pending_calls(runtime) != 0) { goto error; } } // 通过原子操作检查是否有释放 GIL 的请求，如果有，那么该线程就要释放 GIL if (_Py_atomic_load_relaxed(&ceval->gil_drop_request)) { // 将当前线程状态设置为 NULL，因为要发生切换了（关于 GIL，后续会单独介绍） if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) { Py_FatalError(\"ceval: tstate mix-up\"); } // 释放 GIL，给其它线程一个机会，不能让某一个线程一直霸占着 // 如果开启了多线程，那么当释放 GIL 的那一刻，就会被其它线程获取 drop_gil(ceval, tstate); // GIL 释放之后，还要再次获取，但 GIL 已经被其它线程拿走了 // 所以会触发操作系统内核的线程调度机制，进入阻塞状态，等待 GIL 再度回到自己手中 // 因此不难发现，如果有 n 个线程，那么其中的 n - 1 个会陷入阻塞，等待获取 GIL // 而一旦持有 GIL 的线程执行了 drop_gil 函数，将 GIL 释放了 // 那么这 n - 1 个线程当中就会有一个线程拿到 GIL 并解除阻塞，然后开始执行字节码 // 至于释放 GIL 的线程，则会尝试再次获取 GIL，但会因为获取不到而陷入阻塞（已经被其它线程拿走了） take_gil(ceval, tstate); // 检查是否需要快速退出线程（比如在解释器关闭时） exit_thread_if_finalizing(runtime, tstate); // 到这里说明 take_gil 返回了（即阻塞状态解除），也意味着拿到了 GIL，那么要恢复线程状态 if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) { Py_FatalError(\"ceval: orphan tstate\"); } } // 检测线程状态中是否存在异步的异常 if (tstate->async_exc != NULL) { PyObject *exc = tstate->async_exc; tstate->async_exc = NULL; UNSIGNAL_ASYNC_EXC(ceval); _PyErr_SetNone(tstate, exc); Py_DECREF(exc); goto error; } } // 以上是一些中断检测逻辑，如果执行顺利，那么会走到这里 fast_next_opcode: // 保存上一条已执行完毕的字节码的偏移量 f->f_lasti = INSTR_OFFSET(); // 如果启用了 DTrace 行追踪，那么记录行级别的执行信息 if (PyDTrace_LINE_ENABLED()) maybe_dtrace_line(f, &instr_lb, &instr_ub, &instr_prev); // 检查是否需要执行行级追踪，如果追踪功能可用并且设置了追踪函数，那么执行 // 这是 Python 调试和性能分析功能的核心部分，使得像 pdb 这样的调试器能够逐行执行代码 if (_Py_TracingPossible(ceval) && tstate->c_tracefunc != NULL && !tstate->tracing) { int err; // 保存当前栈指针 f->f_stacktop = stack_pointer; // 调用行追踪函数 err = maybe_call_line_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, &instr_lb, &instr_ub, &instr_prev); // 追踪函数可能改变帧的状态，需要重新加载，并更新栈指针 JUMPTO(f->f_lasti); if (f->f_stacktop != NULL) { stack_pointer = f->f_stacktop; f->f_stacktop = NULL; } if (err) goto error; } // 这个宏前面介绍了，它会获取下一条待处理的指令和指令参数 NEXTOPARG(); // 进入 dispatch_opcode 标签 dispatch_opcode: // 下面这些宏主要用于指令追踪和性能分析，简单了解一下就好\n#ifdef DYNAMIC_EXECUTION_PROFILE // 如果启用了动态执行性能分析\n#ifdef DXPAIRS // 如果启用了指令对分析 dxpairs[lastopcode][opcode]++; // 记录相邻指令对的出现次数 lastopcode = opcode; // 更新上一个指令\n#endif dxp[opcode]++; // 记录单个指令的执行次数\n#endif #ifdef LLTRACE // 如果启用了低级追踪，并且追踪开关打开，那么打印偏移量、指令、指令参数等信息 if (lltrace) { if (HAS_ARG(opcode)) { printf(\"%d: %d, %d\\n\", f->f_lasti, opcode, oparg); } else { printf(\"%d: %d\\n\", f->f_lasti, opcode); } }\n#endif // 好的，关键来了，我们终于来到了这个巨型的 switch // 一个指令对应一个 case 分支，里面包含了该指令的处理逻辑 // 因为有一百多个 case 分支，所以这个 switch 语句的代码量高达 2300 多行 // 当然啦，也仅仅只是代码量大，但逻辑很单纯，就是定义了一百多条指令的处理逻辑嘛 switch (opcode) { // NOP 指令的处理逻辑，另外还记得这个 TARGET 宏吗？如果开启了计算跳转，那么分支内部还会定义一个标签 // 此时 case TARGET(NOP) 会展开成 case NOP: TARGET_NOP: case TARGET(NOP): { FAST_DISPATCH(); } // LOAD_FAST 指令的处理逻辑 case TARGET(LOAD_FAST): { PyObject *value = GETLOCAL(oparg); if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // LOAD_CONST 指令的处理逻辑 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); PyObject *value = GETITEM(consts, oparg); Py_INCREF(value); PUSH(value); FAST_DISPATCH(); } // STORE_FAST 指令的处理逻辑 case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); PyObject *value = POP(); SETLOCAL(oparg, value); FAST_DISPATCH(); } // POP_TOP 指令的处理逻辑 case TARGET(POP_TOP): { PyObject *value = POP(); Py_DECREF(value); FAST_DISPATCH(); } // ... // ... // ... // MAKE_FUNCTION 指令的处理逻辑 case TARGET(MAKE_FUNCTION): { // ... PUSH((PyObject *)func); DISPATCH(); } // BUILD_SLICE 指令的处理逻辑 case TARGET(BUILD_SLICE): { // ... if (slice == NULL) goto error; DISPATCH(); } // FORMAT_VALUE 指令的处理逻辑 case TARGET(FORMAT_VALUE): { // ... DISPATCH(); } // EXTENDED_ARG 指令的处理逻辑 case TARGET(EXTENDED_ARG): { int oldoparg = oparg; NEXTOPARG(); oparg |= oldoparg << 8; goto dispatch_opcode; } /* 这些指令内部的具体逻辑，我们后续会聊 */ // 如果执行到这里，说明上面的 case 分支都没有匹配到，意味着出现了一个未知的指令 // 那么打印错误信息：unknown opcde，不过基本不会发生，除非你刻意构造一个不存在的指令\n#if USE_COMPUTED_GOTOS _unknown_opcode:\n#endif default: fprintf(stderr, \"XXX lineno: %d, opcode: %d\\n\", PyFrame_GetLineNumber(f), opcode); _PyErr_SetString(tstate, PyExc_SystemError, \"unknown opcode\"); goto error; } // 到这里，switch 语句块就结束了 // 这个位置永远不可能到达，因为在每条指令的处理逻辑的最后，要么调用 DISPATCH()，要么 goto error // 调用 DISPATCH() 会去执行下一条指令，goto error 会跳转到下面的 error 标签 // 当然这里的 Py_UNREACHABLE() 有没有都无所谓，但加上之后会让程序显得更加严谨 Py_UNREACHABLE(); // 如果字节码指令在执行时出错了，那么会设置异常，然后跳转到 error 标签\nerror:\n// 以下是错误处理的防御性代码，用于确保在发生错误时总是设置了适当的异常 // 记得之前介绍过异常的本质，其实就是解释器内部在执行时发现逻辑出问题了（比如索引超出范围）\n// 那么会将异常（比如 IndexError）设置在回溯栈中，并立即返回一个表示错误的哨兵值\n// 当解释器将返回值传递给 Python 时，会发现返回值为 NULL，知道出异常了\n// 于是会将回溯栈里的异常输出到 stderr 当中，就是我们在终端中看到的那一坨红色的东西，然后结束进程\n// 但如果解释器发现回溯栈里面没有异常，那么会额外设置一个 SystemError: error return without exception set\n// 意思就是：\"明明发生错误了，为什么回溯栈里面没有设置异常呢？\"，一般这个问题会在用 C 编写扩展模块的时候遇到 #ifdef NDEBUG if (!_PyErr_Occurred(tstate)) { _PyErr_SetString(tstate, PyExc_SystemError, \"error return without exception set\"); }\n#else // 当然如果没有定义 NDEBUG 宏的话，那么就会展开成一个 assert 断言 // 对于解释器本身来说，像这种 assert 断言都是成立的，否则底层源码写的就有问题 assert(_PyErr_Occurred(tstate));\n#endif // 报错时，要生成 traceback，即回溯栈，关于 traceback，等介绍异常捕获的时候再说 PyTraceBack_Here(f); // 执行追踪函数，用于调试器捕获异常、追踪异常、以及异常处理的监控和分析等 // 在使用 pdb 调试器时，这个机制允许调试器捕获和显示异常信息 if (tstate->c_tracefunc != NULL) call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); // 这里和异常捕获相关，我们后续再聊 exception_unwind: while (f->f_iblock > 0) { // ... } break; } // 到这里，外层的 for 循环就结束了，显然会有两种情况 // 要么字节码都执行完毕了，要么出异常了，但不管是哪种，都意味着要退出栈桢了 assert(retval == NULL); assert(_PyErr_Occurred(tstate)); // 到这里说明要退出栈桢了，如果运行时栈里面还有元素的话，那么要清空\nexit_returning: while (!EMPTY()) { PyObject *o = POP(); Py_XDECREF(o); } // 生成器在 yield 时的追踪处理逻辑\n// 另外像这些追踪函数可以不用太关注，都是用于调试和性能分析的\nexit_yielding: if (tstate->use_tracing) { if (tstate->c_tracefunc) { if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } if (tstate->c_profilefunc) { if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj, tstate, f, PyTrace_RETURN, retval)) { Py_CLEAR(retval); } } } // 帧评估函数退出时的清理代码\nexit_eval_frame: // 如果启用了 DTrace，记录函数返回事件 if (PyDTrace_FUNCTION_RETURN_ENABLED()) dtrace_function_return(f); // 退出递归调用，与之前的 Py_EnterRecursiveCall() 相对应 Py_LeaveRecursiveCall(); // 标记帧不再处于执行状态 f->f_executing = 0; // 当调用一个函数时，会在当前帧的基础上创建新的帧，并将执行权交给新的帧 // 当函数执行完毕时，会销毁栈桢，并将执行权还给上一级栈帧（即调用者的帧），这个过程叫做栈桢回退 // 显然这里要将 f->back 赋值给 tstate->frame，即回退到上一级栈桢 tstate->frame = f->f_back; // 检查返回值的有效性，确保返回值符合 Python 的调用约定 return _Py_CheckFunctionResult(NULL, retval, \"PyEval_EvalFrameEx\"); } 以上就是帧评估函数的源码逻辑，总的来说并不难理解，其核心就是通过 for 循环遍历字节码指令集，将遍历出的指令交给内部的 switch 语句，执行对应的 case 分支。当匹配到的 case 分支执行完毕时，会有以下三种情况： 停止循环、退出帧评估函数，当执行的指令为 RETURN_VALUE、YIELD_VALUE 等。 执行指令的过程中出错了，跳转到 error 标签，然后进行异常处理（或者直接抛出异常）。 执行下一条指令，如果开启了计算跳转，那么会精确跳转到下一条指令的处理逻辑中，否则会跳转到 fast_next_opcode 标签的所在位置、或者 for 循环的所在位置。但不管如何，虚拟机接下来的动作就是获取下一条字节码指令和指令参数，完成对下一条指令的执行。 所以通过 for 循环一条一条遍历 co_code 中的字节码指令，然后交给内部的 switch 语句、执行对应的 case 分支，如此周而复始，最终完成了对整个 Python 程序的执行。 相信到此刻你已经彻底了解了 Python 执行引擎的整体结构。说白了虚拟机就是将自己当成一个 CPU，在栈帧中一条条的执行指令，而执行过程中所依赖的常量、变量等，则由栈帧的其它字段来维护。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 源码解析字节码指令的执行过程","id":"262","title":"源码解析字节码指令的执行过程"},"263":{"body":"光看源码还是有点枯燥的，下面我们来写一段简单的代码，然后反编译，并通过画图来演示虚拟机是如何执行字节码的。 code = \"\"\"\\\nchinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3\n\"\"\" # 将上面的代码以模块的方式进行编译\nco = compile(code, \"my_module\", \"exec\")\n# 查看常量池\nprint(co.co_consts) # (89, 99, 91, 3, None)\n# 查看符号表\nprint(co.co_names) # ('chinese', 'math', 'english', 'avg') 在编译的时候，常量和符号（变量）都会被静态收集起来。然后我们反编译一下看看字节码，直接通过 dis.dis(co) 即可，结果如下： 1 0 LOAD_CONST 0 (89) 2 STORE_NAME 0 (chinese) 2 4 LOAD_CONST 1 (99) 6 STORE_NAME 1 (math) 3 8 LOAD_CONST 2 (91) 10 STORE_NAME 2 (english) 4 12 LOAD_NAME 0 (chinese) 14 LOAD_NAME 1 (math) 16 BINARY_ADD 18 LOAD_NAME 2 (english) 20 BINARY_ADD 22 LOAD_CONST 3 (3) 24 BINARY_TRUE_DIVIDE 26 STORE_NAME 3 (avg) 28 LOAD_CONST 4 (None) 30 RETURN_VALUE 上面每一列的含义之前说过，这里再重复一下。 第一列是源代码的行号； 第二列是指令的偏移量，或者说该指令在整个字节码指令序列中的索引。因为每条指令后面都跟着一个参数，所以偏移量是 0 2 4 6 8 ...； 第三列是字节码指令，简称指令，它们在宏定义中代表整数； 第四列是字节码指令参数，简称指令参数、或者参数，不同的指令参数的含义不同； 第五列是 dis 模块给我们额外提供的信息，一会儿说； 我们从上到下依次解释每条指令都干了什么？ 0 LOAD_CONST：表示加载一个常量（指针），并压入运行时栈。后面的指令参数 0 表示从常量池中加载索引为 0 的常量，至于 89 则表示加载的常量是 89。所以最后面的括号里面的内容实际上起到的是一个提示作用，告诉你加载的对象是什么。 2 STORE_NAME：表示将 LOAD_CONST 加载的常量用一个名字绑定起来，放在所在的名字空间中。后面的 0 (chinese) 则表示使用符号表中索引为 0 的名字（符号），且名字为 \"chinese\"。 所以像 chinese = 89 这种简单的赋值语句，会对应两条字节码指令。 然后 4 LOAD_CONST、6 STORE_NAME 和 8 LOAD_CONST、10 STORE_NAME 的作用显然和上面是一样的，都是加载一个常量，然后将某个符号和常量绑定起来，并放在名字空间中。 12 LOAD_NAME：加载一个变量，并压入运行时栈，而后面的 0 (chinese) 表示加载符号表中索引为 0 的变量的值，然后这个变量叫 chinese。14 LOAD_NAME 也是同理，将符号表中索引为 1 的变量的值压入运行时栈，并且变量叫 math。此时栈里面有两个元素，从栈底到栈顶分别是 chinese 和 math。 16 BINARY_ADD：将上面两个变量从运行时栈弹出，然后执行加法操作，并将结果压入运行时栈。 18 LOAD_NAME：将符号表中索引为 2 的变量 english 的值压入运行时栈，此时栈里面有两个元素，从栈底到栈顶分别是 chinese + math 的返回结果和 english。 20 BINARY_ADD：将运行时栈里的两个元素弹出，然后执行加法操作，并将结果压入运行时栈。此时栈里面有一个元素，就是 chinese + math + english 的返回结果。 22 LOAD_CONST：将常量 3 压入运行时栈，此时栈里面有两个元素； 24 BINARY_TRUE_DIVIDE：将运行时栈里的两个元素弹出，然后执行除法操作，并将结果压入运行时栈，此时栈里面有一个元素； 26 STORE_NAME：将元素从运行时栈里面弹出，并用符号表中索引为 3 的变量 avg 和它绑定起来，然后放在名字空间中。 28 LOAD_CONST：将常量 None 压入运行时栈，然后通过 30 RETURN_VALUE 将其从栈中弹出、并返回。 所以 Python 虚拟机就是把自己想象成一个 CPU，在栈帧中一条条执行字节码指令，当指令执行完毕或执行出错时，停止执行。 我们通过几张图展示一下上面的过程，为了阅读方便，这里将相应的源代码再贴一份。 chinese = 89\nmath = 99\nenglish = 91\navg = (chinese + math + english) / 3 之前说了，模块也有自己的作用域，并且是全局作用域，所以虚拟机也会为它创建栈帧。而在代码还没有执行的时候，栈帧就已经创建好了，整个布局如下。 f_localsplus 下面的箭头方向，代表运行时栈从栈底到栈顶的方向。 这里再强调一下 f_localsplus 字段，它是一个柔性数组。虽然声明的时候写着长度为 1，但实际使用时，长度不受限制，和 Go 语言不同，C 数组的长度不属于类型的一部分。然后 f_localsplus 在逻辑上被分成了四份，分别用于局部变量、cell 变量、free 变量、运行时栈，由于当前示例中的代码是以模块的方式编译的，里面所有的变量都是全局变量，而且也不涉及闭包啥的，所以这里就把 f_localsplus 理解为运行时栈即可。 接下来就开始执行字节码了，next_instr 指向下一条待执行的字节码指令，显然初始状态下，下一条待执行的指令就是第一条指令。 于是虚拟机开始执行 0 LOAD_CONST，该指令表示将常量加载进运行时栈，而要加载的常量在常量池中的索引，由指令参数表示。 在源码中，指令对应的变量是 opcode，指令参数对应的变量是 oparg。 case TARGET(LOAD_CONST): { PREDICTED(LOAD_CONST); // 调用元组的 GETITEM 方法，从常量池中加载索引为 oparg 的对象 // 当然啦，为了描述方便我们称之为对象，但其实是指向对象的指针 PyObject *value = GETITEM(consts, oparg); // 增加引用计数 Py_INCREF(value); // 压入运行时栈 PUSH(value); FAST_DISPATCH();\n} 该指令的参数为 0，所以会将常量池中索引为 0 的元素 89 压入运行时栈，执行完之后，栈帧的布局就变成了下面这样： 接着虚拟机执行 2 STORE_NAME 指令，从符号表中获取索引为 0 的符号、即 chinese。然后将栈顶元素 89 弹出，再将符号 chinese 和整数对象 89 绑定起来保存到 local 名字空间中。 case TARGET(STORE_NAME): { // 从符号表中加载索引为 oparg 的符号 // 符号本质上就是一个 PyUnicodeObject 对象 // 这里就是字符串 \"chinese\" PyObject *name = GETITEM(names, oparg); // 从运行时栈的栈顶弹出元素 // 显然是上一步压入的 89 PyObject *v = POP(); // 获取名字空间 namespace PyObject *ns = f->f_locals; int err; // 如果没有名字空间则报错，设置异常 if (ns == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals found when storing %R\", name); Py_DECREF(v); goto error; } // 将符号和对象绑定起来放在 ns 中 // 名字空间是一个字典，PyDict_CheckExact 负责检测 ns 是否为字典，等价于 type(ns) is dict // 除此之外，还有 PyDict_Check(ns)，它等价于 isinstance(ns, dict) if (PyDict_CheckExact(ns)) // 通过字典的特定类型 API 将键值对 \"chinese\": 89 设置到字典中 err = PyDict_SetItem(ns, name, v); else // 走到这里说明 type(ns) 不是 dict，那么它应该继承 dict // 通过泛型 API 设置元素 err = PyObject_SetItem(ns, name, v); // 对象的引用计数减 1，因为从运行时栈中弹出了 Py_DECREF(v); // 如果 err != 0，证明设置元素出错了，跳转至 error 标签 if (err != 0) goto error; // 调用 DISPATCH() 执行下一条指令，如果没有开启计算跳转，那么它就相当于一个 continue DISPATCH();\n} 执行完之后，栈帧的布局就变成了下面这样： 此时运行时栈为空，local 名字空间多了个键值对。 同理剩余的两个赋值语句也是类似的，只不过指令参数不同，比如 6 STORE_NAME 加载的是符号表中索引为 1 的符号，10 STORE_NAME 加载的是符号表中索引为 2 的符号，分别是 math 和 english。它们执行完之后，栈桢布局如下： 然后 12 LOAD_NAME 和 14 LOAD_NAME 负责将符号表中索引为 0 和 1 的变量的值压入运行时栈： case TARGET(LOAD_NAME): { // 从符号表 co_names 中加载索引为 oparg 的变量（符号） // 但是注意：全局变量是通过字典存储的 // 所以这里的 name 只是一个字符串罢了，比如 \"chinese\" // 然后还要再根据这个字符串从字典里面查找对应的 value PyObject *name = GETITEM(names, oparg); // 对于模块来说，f->f_locals 和 f->f_globals 指向同一个字典 PyObject *locals = f->f_locals; PyObject *v; // local 名字空间一定不为 NULL if (locals == NULL) { _PyErr_Format(tstate, PyExc_SystemError, \"no locals when loading %R\", name); goto error; } // 如果 type(locals) is dict 为真 if (PyDict_CheckExact(locals)) { // 根据 name 获取 value，所以 print(chinese) 本质上就是下面这样 // print(locals[\"chinese\"]) v = PyDict_GetItemWithError(locals, name); if (v != NULL) { Py_INCREF(v); } else if (_PyErr_Occurred(tstate)) { goto error; } } // 否则说明 type(locals) is dict 为假，但 isinstance(locals, dict) 为真 else { // 通过泛型 API 获取元素 v = PyObject_GetItem(locals, name); if (v == NULL) { if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) goto error; _PyErr_Clear(tstate); } } // 如果 v 等于 NULL，说明 local 空间不存在 if (v == NULL) { // 那么从全局名字空间（global 名字空间）获取 v = PyDict_GetItemWithError(f->f_globals, name); // 如果 v 不等于 NULL，说明获取到了 if (v != NULL) { Py_INCREF(v); } // 否则说明 global 空间也不存在指定的 key // 这里检测一下是否有异常产生，有的话跳转到 error 标签 else if (_PyErr_Occurred(tstate)) { goto error; } // local 空间和 global 空间都没有，那么该去 builtin 空间查找了 else { // 逻辑和上面是类似的，如果查找不到，跳转到 error 标签，否则增加引用计数 if (PyDict_CheckExact(f->f_builtins)) { v = PyDict_GetItemWithError(f->f_builtins, name); if (v == NULL) { if (!_PyErr_Occurred(tstate)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } Py_INCREF(v); } else { v = PyObject_GetItem(f->f_builtins, name); if (v == NULL) { if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) { format_exc_check_arg( tstate, PyExc_NameError, NAME_ERROR_MSG, name); } goto error; } } } } // 压入运行时栈 PUSH(v); DISPATCH();\n} 上面两条指令执行完之后，栈帧的布局就变成了下面这样： 接下来执行 16 BINARY_ADD，它会将栈里的两个元素弹出，然后执行加法操作，最后再将结果入栈。 当然上面这种说法是为了方便理解，其实虚拟机真正执行的时候，只会弹出一个元素，而另一个元素只是使用 TOP() 进行查看，但不弹出。等结果计算完毕之后，再将栈顶元素替换掉。 所以本质上，和弹出两个元素、再将计算结果入栈是一样的。 case TARGET(BINARY_ADD): { // 从栈顶弹出元素，这里是 99（变量 math） PyObject *right = POP(); // math 弹出之后，chinese 就成为了新的栈顶元素 // 这里的 TOP() 则是获取栈顶元素 89（变量 chinese） PyObject *left = TOP(); // 用于保存两者的和 PyObject *sum; // 如果是字符串，执行专门的函数 if (PyUnicode_CheckExact(left) && PyUnicode_CheckExact(right)) { sum = unicode_concatenate(tstate, left, right, f, next_instr); } // 否则通过泛型 API 进行计算 else { sum = PyNumber_Add(left, right); Py_DECREF(left); } // 减少元素的引用计数 Py_DECREF(right); // 将栈顶元素替换成 sum SET_TOP(sum); if (sum == NULL) goto error; DISPATCH();\n} BINARY_ADD 指令执行完之后，栈帧的布局就变成了下面这样： 然后 18 LOAD_NAME 负责将符号表中索引为 2 的变量 english 的值压入运行时栈，而指令 20 BINARY_ADD 则是继续执行加法操作，并将结果设置在栈顶，然后 22 LOAD_CONST 将常量 3 再压入运行时栈。 这三条指令执行之后，运行时栈的变化如下： 接着是 24 BINARY_TRUE_DIVIDE，它的逻辑和 BINARY_ADD 类似，只不过一个执行除法，一个执行加法。 case TARGET(BINARY_TRUE_DIVIDE): { // 从栈顶弹出元素，显然是 3 PyObject *divisor = POP(); // 查看栈顶元素，此时栈顶元素变成了 279 PyObject *dividend = TOP(); // 调用 PyNumber_TrueDivide，执行 279 / 3 PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); // 减少引用计数 Py_DECREF(dividend); Py_DECREF(divisor); // 将栈顶元素替换成 279 / 3 的计算结果 SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} 当 24 BINARY_TRUE_DIVIDE 执行完之后，运行时栈如下： 然后 26 STORE_NAME 将栈顶元素 93.0 弹出，并将符号表中索引为 3 的变量 avg 和它绑定起来，放到名字空间中。因此最终栈帧关系图如下： 以上就是虚拟机对这几行代码的执行流程，整个过程就像 CPU 执行指令一样。 我们再用 Python 代码描述一遍上面的逻辑： # LOAD_CONST 将 89 压入栈中，STORE_NAME 将 89 从栈中弹出\n# 并将符号 \"chinese\" 和 89 绑定起来，放在名字空间中\nchinese = 89\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89} math = 99\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99} english = 91\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91} avg = (chinese + math + english) / 3\nprint( {k: v for k, v in locals().items() if not k.startswith(\"__\")}\n) # {'chinese': 89, 'math': 99, 'english': 91, 'avg': 93.0} 现在你是不是对虚拟机执行字节码有更深的了解了呢？当然字节码指令非常多，不止我们上面看到的那几个。你可以随便写一些代码，然后分析一下它的字节码指令是什么。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 通过反编译查看字节码","id":"263","title":"通过反编译查看字节码"},"264":{"body":"到此，我们就深入源码，考察了虚拟机执行字节码的流程，帧评估函数虽然很长，也有那么一些复杂，但是核心逻辑不难理解。就是把自己当成一个 CPU，在栈帧中执行字节码指令。 下一篇文章我们来介绍一下常见的几个指令，并探讨不同的变量赋值语句的背后原理。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"58. 深入源码，进一步考察字节码的执行流程 » 小结","id":"264","title":"小结"},"265":{"body":"前面我们剖析了字节码的执行流程，本来应该接着介绍一些常见指令的，但因为有几个指令涉及到了局部变量，所以我们单独拿出来说。与此同时，我们还要再度考察一下 local 名字空间，它的背后还隐藏了很多内容。 我们知道函数的参数和函数内部定义的变量都属于局部变量，均是通过静态方式访问的。 x = 123 def foo1(): global x a = 1 b = 2 # co_nlocals 会返回局部变量的个数\n# a 和 b 是局部变量，x 是全局变量，因此是 2\nprint(foo1.__code__.co_nlocals) # 2 def foo2(a, b): pass print(foo2.__code__.co_nlocals) # 2 def foo3(a, b): a = 1 b = 2 c = 3 print(foo3.__code__.co_nlocals) # 3 无论是参数还是内部新创建的变量，本质上都是局部变量。 按照之前的理解，当访问一个全局变量时，会去访问 global 名字空间（也叫全局名字空间）。 那么问题来了，当操作函数的局部变量时，是不是也等价于操作其内部的 local 名字空间（局部名字空间）呢？我们往下看。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 楔子","id":"265","title":"楔子"},"266":{"body":"之前我们说过 Python 变量的访问是有规则的，会按照本地、闭包、全局、内置的顺序去查找，也就是 LEGB 规则，所以在查找变量时，local 名字空间应该是第一选择。 但不幸的是，虚拟机在为调用的函数创建栈帧对象时，这个至关重要的 local 名字空间并没有被创建。因为栈帧的 f_locals 字段和 f_globals 字段分别指向了局部名字空间和全局名字空间，而创建栈帧时 f_locals 被初始化成了 NULL，所以并没有创建局部名字空间。这里可能有人会有疑问，因为印象之中函数是有 local 空间的吧。 import inspect # 模块的栈帧\nframe = inspect.currentframe()\n# 对于模块而言，局部名字空间和全局名字空间是同一个字典\nprint(frame.f_locals is frame.f_globals) # True\n# 当然啦，局部名字空间和全局名字空间也可以通过内置函数获取\nprint( frame.f_locals is locals() is frame.f_globals is globals()\n) # True # 但对于函数而言就不一样了\ndef foo(): name = \"古明地觉\" return inspect.currentframe() frame = foo()\n# global 名字空间全局唯一\n# 无论是获取栈帧的 f_globals，还是调用 globals()，得到的都是同一份字典\nprint(frame.f_globals is globals()) # True\n# 但每个函数都有自己独立的局部名字空间\nprint(frame.f_locals) # {'name': '古明地觉'} # 咦，不是说局部名字空间被初始化为 NULL 吗？\n# 那么在 Python 里面获取的话，结果应该是个 None 才对啊\n# 关于这一点，我们稍后会解释 总之对于函数而言，在创建栈帧时，它的 f_locals 被初始化为 NULL。那么问题来了，局部变量到底存储在什么地方呢？当然，由于变量只是一个名字（符号），而局部变量的名字都存储在符号表中，所以更严谨的说法是，局部变量的值存储在什么地方？ 在介绍虚拟机执行字节码的时候我们说过，当函数被调用时，虚拟机会为其创建一个栈帧。栈帧是虚拟机的执行环境，包含了执行时所依赖的上下文，而栈帧内部有一个字段叫 f_localsplus，它是一个数组。 这个数组虽然是一段连续内存，但在逻辑上被分成了 4 份，其中局部变量便存储在 f_localsplus 的第一份空间中。现在我们明白了，局部变量是静态存储在数组中的。 我们举个例子。 def foo(a, b): c = a + b print(c) 它的字节码如下： // 加载局部变量 a，压入运行时栈\n2 0 LOAD_FAST 0 (a) // 加载局部变量 b，压入运行时栈 2 LOAD_FAST 1 (b) // 将 a 和 b 从栈中弹出，然后做加法运算，再将结果压入栈中 4 BINARY_ADD // 加载符号 c，弹出栈顶元素（a + b 的运算结果） // 然后将两者绑定起来，完成赋值语句 c = a + b 6 STORE_FAST 2 (c) // 加载变量 print，优先从 global 空间中加载 // 如果 global 空间里面没有，那么再从 builtin 空间中加载\n3 8 LOAD_GLOBAL 0 (print) // 加载局部变量 c 10 LOAD_FAST 2 (c) // 执行 print(c)，并将返回值压入栈中，print 的返回值是 None 12 CALL_FUNCTION 1 // 弹出栈顶的返回值，因为没有用变量保存，所以会直接丢弃 14 POP_TOP // 隐式的 return None 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 注意里面的 LOAD_FAST 和 STORE_FAST，这两个指令对应的逻辑如下。 case TARGET(LOAD_FAST): { // 通过宏 GETLOCAL 获取局部变量的值 PyObject *value = GETLOCAL(oparg); // 如果值为 NULL，抛出 UnboundLocalError if (value == NULL) { format_exc_check_arg(tstate, PyExc_UnboundLocalError, UNBOUNDLOCAL_ERROR_MSG, PyTuple_GetItem(co->co_varnames, oparg)); goto error; } // 增加引用计数并压入运行时栈 Py_INCREF(value); PUSH(value); FAST_DISPATCH();\n} case TARGET(STORE_FAST): { PREDICTED(STORE_FAST); // 获取栈顶元素 PyObject *value = POP(); // 通过宏 SETLOCAL 创建局部变量 SETLOCAL(oparg, value); FAST_DISPATCH();\n} 所以 LOAD_FAST 和 STORE_FAST 分别负责加载和创建局部变量，而核心就是里面的两个宏：GETLOCAL、SETLOCAL，这两个宏也是定义在帧评估函数里面的。 // Python/ceval.c // 在帧评估函数中，fastlocals 会被赋值为 f->f_localsplus\n#define GETLOCAL(i) (fastlocals[i]) #define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \\ GETLOCAL(i) = value; \\ Py_XDECREF(tmp); } while (0)\n/* 这里额外再补充一个关于 C 语言的知识点 * 我们看到宏 SETLOCAL 展开之后的结果是 do {...} while (0) * do while 循环会先执行 do 里面的循环体，然后再判断条件是否满足 * 因此从效果上来说，执行 do {...} while (0) 和直接执行 ... 是等价的 * 那么问题来了，既然效果等价，为啥还要再套一层 do while 呢 * 其实原因很简单，如果宏在展开之后会生成多条语句，那么这些语句要成为一个整体 * 另外由于 C 程序的语句要以分号结尾，所以在调用宏时，我们也会习惯性地在结尾加上分号 * 因此我们希望有这样一种结构，能同时满足以下要求： * 1）可以将多条语句包裹起来，作为一个整体； * 2）程序的语义不能发生改变； * 3）在语法上，要以分号结尾； * 显然 do while 完美满足以上三个要求，只需将 while 里的条件设置为 0 即可 * 并且当编译器看到 while (0) 时，也会进行优化，去掉不必要的循环控制结构 * 因此以后看到 do {...} while (0) 时，不要觉得奇怪，这是宏的一个常用技巧 */ 我们看到操作局部变量，就是在基于索引操作数组 f_localsplus，显然这个过程比操作字典要快。尽管字典是经过高度优化的，但显然再怎么优化，也不可能快过数组的静态操作。 所以此时我们对局部变量的藏身之处已经了然于心，它们就存放在栈帧的 f_localsplus 字段中，而之所以没有使用 local 名字空间的原因也很简单。因为函数内部的局部变量在编译时就已经确定了，个数是不会变的，因此编译时也能确定局部变量占用的内存大小，以及访问局部变量的字节码指令应该如何访问内存。 def foo(a, b): c = a + b print(c) print( foo.__code__.co_varnames\n) # ('a', 'b', 'c') 比如变量 c 位于符号表中索引为 2 的位置，这在编译时就已确定。 当创建变量 c 时，只需修改数组 f_localsplus 中索引为 2 的元素即可。 当访问变量 c 时，只需获取数组 f_localsplus 中索引为 2 的元素即可。 这个过程是基于数组索引实现的静态查找，所以操作局部变量和操作全局变量有着异曲同工之妙。操作全局变量本质上是基于 key 操作字典的 value，其中 key 是变量的名称，value 是变量的值；而操作局部变量本质上是基于索引操作数组 f_localsplus 的元素，这个索引就是变量名在符号表中的索引，对应的数组元素就是变量的值。 所以我们说 Python 的变量其实就是个名字，或者说符号，到这里是不是更加深刻地感受到了呢？ 但对于局部变量来说，如果想实现静态查找，显然要满足一个前提：变量名在符号表中的索引和与之绑定的值在 f_localsplus 中的索引必须是一致的。毫无疑问，两者肯定是一致的，并且索引是多少在编译阶段便已经确定，会作为指令参数保存在字节码指令序列中。 好，到此可以得出结论，虽然虚拟机为函数实现了 local 名字空间（初始为 NULL），但在操作局部变量时却没有使用它，原因就是为了更高的效率。当然还有所谓的 LEGB，都说变量查找会遵循这个规则，但我们心里清楚，局部变量其实是静态访问的，不过完全可以按照 LEGB 的方式来理解。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 如何访问（创建）一个局部变量","id":"266","title":"如何访问（创建）一个局部变量"},"267":{"body":"先来看一下全局名字空间： x = 1 def foo(): globals()[\"x\"] = 2 foo()\nprint(x) # 2 global 空间全局唯一，在 Python 层面上就是一个字典，在任何地方操作该字典，都相当于操作全局变量，即使是在函数内部。因此在执行完 foo() 之后，全局变量 x 就被修改了。但 local 名字空间也是如此吗？我们尝试一下。 def foo(): x = 1 locals()[\"x\"] = 2 print(x) foo() # 1 我们按照相同的套路，却并没有成功，这是为什么？原因就是上面解释的那样，函数内部有哪些局部变量在编译时就已经确定了，查询的时候是从数组 f_localsplus 中静态查找的，而不是从 local 名字空间中查找。 然后我们打印一下 local 名字空间，看看里面都有哪些内容。 def foo(): name = \"satori\" print(locals()) age = 17 print(locals()) gender = \"female\" print(locals()) foo()\n\"\"\"\n{'name': 'satori'}\n{'name': 'satori', 'age': 17}\n{'name': 'satori', 'age': 17, 'gender': 'female'}\n\"\"\" 我们看到打印 locals() 居然也会显示内部的局部变量，相信聪明如你已经猜到 locals() 是怎么回事了。符号表里面存储了局部变量的符号（或者说名字），f_localsplus 里面存储了局部变量的值，当执行 locals() 的时候，会基于符号表和 f_localsplus 创建一个字典出来。 def foo(): name = \"satori\" age = 17 gender = \"female\" print(locals()) # 符号表：保存了函数中创建的局部变量的名字\nprint(foo.__code__.co_varnames)\n\"\"\"\n('name', 'age', 'gender')\n\"\"\"\n# 调用函数时会创建栈帧，局部变量的值都保存在 f_localsplus 里面\n# 并且符号表中变量名的顺序和 f_localsplus 中变量值的顺序是一致的\nf_localsplus = [\"satori\", 17, \"female\"]\n# 这里就用一个列表来模拟了 我们来看一下变量的创建。 由于符号 name 位于符号表中索引为 0 的位置，那么执行 name = \"satori\" 时，就会将 \"satori\" 放在 f_localsplus 中索引为 0 的位置。 由于符号 age 位于符号表中索引为 1 的位置，那么执行 age = 17 时，就会将 17 放在 f_localsplus 中索引为 1 的位置。 由于符号 gender 位于符号表中索引为 2 的位置，那么执行 gender = \"female\" 时，就会将 \"female\" 放在 f_localsplus 中索引为 2 的位置。 后续在访问变量的时候，比如访问变量 age，由于它位于符号表中索引为 1 的位置，那么就会通过 f_localsplus[1] 获取它的值，这些符号对应的索引都是在编译阶段确定的。所以在运行时才能实现静态查找，指令 LOAD_FAST 和 STORE_FAST 都是基于索引来静态操作底层数组。 我们用一张图来描述这个过程： 符号表负责存储局部变量的名字，f_localsplus 负责存储局部变量的值（里面的元素初始为 NULL），而在给局部变量赋值的时候，本质上就是将值写在了 f_localsplus 中。并且变量名在符号表中的索引，和变量值在 f_localsplus 中的索引是一致的，因此操作局部变量本质上就是在操作 f_localsplus 数组。至于 locals() 或者说局部名字空间，它是基于符号表和 f_localsplus 动态创建的，为了方便我们获取已存在的局部变量，执行 locals() 会临时创建一个字典（只会创建一次）。 所以我们通过 locals() 获取局部名字空间之后，访问里面的局部变量是可以的，只不过此时将静态访问变成了动态访问。 def foo(): name = \"satori\" # 会从 f_localsplus 中静态查找 print(name) # 先基于已有的变量和值创建一个字典 # 然后通过字典实现变量的动态查找 print(locals()[\"name\"]) foo()\n\"\"\"\nsatori\nsatori\n\"\"\" 两种方式都是可以的，但基于 locals() 来访问，在效率上明显会低一些。 另外基于 locals() 访问一个变量是可以的，但无法创建一个变量。 def foo(): name = \"satori\" locals()[\"age\"] = 17 try: print(age) except NameError as e: print(e) foo()\n\"\"\"\nname 'age' is not defined\n\"\"\" 局部变量是静态存储在数组里的，locals() 只是做了一个拷贝而已。往局部名字空间里面添加一个键值对，不等于创建一个局部变量，因为局部变量不是从它这里查找的，因此代码中打印 age 报错了。但如果外部还有一个全局变量 age 的话，那么会打印全局变量 age。 然后再补充一点，我们说全局名字空间在任何地方都是唯一的，而对于函数而言，它的局部名字空间在整个函数内部也是唯一的。不管调用 locals 多少次，拿到的都是同一个字典。 def foo(): name = \"satori\" # 执行 locals() 的时候，内部只有一个键值对 d = locals() print(d) # {'name': 'satori'} # 再次获取，此时有两个键值对 print(locals()) # {'name': 'satori', 'd': {...}} # 但两者的 id 相同，因为一个函数只有一个局部名字空间 # 不管调用多少次 locals()，拿到的都是同一个字典 print(id(d) == id(locals())) # True foo() 所以 locals() 和 globals() 指向的名字空间都是唯一的，只不过 locals() 是在某个函数内部唯一，而 globals() 在所有地方都唯一。 因此局部名字空间初始为 NULL，但在第一次执行 locals() 时，会以符号表中的符号作为 key，f_localsplus 中的值作为 value，创建一个字典作为函数的局部名字空间。而后续再执行 locals() 的时候，由于名字空间已存在，就不会再次创建了，直接基于当前的局部变量对字典进行更新即可。 def foo(): # 创建一个字典，由于当前还没有定义局部变量，因此是空字典 print(locals()) # {} # 往局部名字空间添加一个键值对 locals()[\"a\"] = \"b\" print(locals()) # {'a': 'b'} # 定义一个局部变量 name = \"satori\" # 由于局部名字空间已存在，因此不会再次创建 # 直接将局部变量的名字作为 key、值作为 value，拷贝到字典中 print(locals()) # {'a': 'b', 'name': 'satori'} foo() 注意：虽然局部名字空间里面存在 \"a\" 这个 key，但 a 这个局部变量是不存在的。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 解密 local 名字空间","id":"267","title":"解密 local 名字空间"},"268":{"body":"目前我们已经知道 local 名字空间是怎么创建的了，也熟悉了它的特性，下面通过源码来看一下它的构建过程。 // Python/bltinmodule.c static PyObject *\nbuiltin_locals_impl(PyObject *module)\n{ PyObject *d; // Python 内置函数的源码实现位于 bltinmodule.c 中 // 这里又调用了 PyEval_GetLocals d = PyEval_GetLocals(); Py_XINCREF(d); return d;\n} // Python/ceval.c\nPyObject *\nPyEval_GetLocals(void)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); // 拿到当前栈桢 PyFrameObject *current_frame = _PyEval_GetFrame(tstate); if (current_frame == NULL) { _PyErr_SetString(tstate, PyExc_SystemError, \"frame does not exist\"); return NULL; } // 调用 PyFrame_FastToLocalsWithError 创建 local 名字空间 // 并赋值给 current_frame->f_locals if (PyFrame_FastToLocalsWithError(current_frame) < 0) { return NULL; } assert(current_frame->f_locals != NULL); // 返回 current_frame->f_locals return current_frame->f_locals;\n} // Objects/frameobject.c\nint\nPyFrame_FastToLocalsWithError(PyFrameObject *f)\n{ PyObject *locals, *map; PyObject **fast; PyCodeObject *co; Py_ssize_t j; Py_ssize_t ncells, nfreevars; // 栈桢不能为空 if (f == NULL) { PyErr_BadInternalCall(); return -1; } // 获取局部名字空间 locals = f->f_locals; // 如果为 NULL，那么创建一个新字典，作为名字空间 // 所以局部名字空间只会创建一次，后续不会再创建 if (locals == NULL) { locals = f->f_locals = PyDict_New(); if (locals == NULL) return -1; } // 获取 PyCodeObject 对象 co = f->f_code; // 拿到内部的符号表（一个元组），里面保存了函数局部变量的名字 map = co->co_varnames; if (!PyTuple_Check(map)) { PyErr_Format(PyExc_SystemError, \"co_varnames must be a tuple, not %s\", Py_TYPE(map)->tp_name); return -1; } // 获取 f_localsplus，它里面保存了局部变量的值 // 只不过除了局部变量的值之外，还保存了其它的 fast = f->f_localsplus; // 那么 f_localsplus 里面到底有多少个局部变量的值呢？显然这要基于符号表来判断 // co_varnames 里面保存了多少个符号，f_localsplus 里面就保存了多少个局部变量的值 j = PyTuple_GET_SIZE(map); if (j > co->co_nlocals) // 理论上符号表的长度和局部变量的个数（co_nlocals）是相等的 // 但如果超过了 co_nlocals，那么让它等于 co_nlocals j = co->co_nlocals; // 如果 co_nlocals 大于 0，证明存在局部变量，那么调用 map_to_dict // 将 co_varnames 和 f_localsplus 里的元素组成键值对，添加到局部名字空间中 if (co->co_nlocals) { // 相当于 locals.update(zip(co_varnames, f_localsplus)) if (map_to_dict(map, j, locals, fast, 0) < 0) return -1; } // 如果里面有 cell 变量和 free 变量的话，也会添加到局部名字空间中 // 关于 cell 变量和 free 变量，由于它们和闭包相关，所以等介绍闭包的时候再说 ncells = PyTuple_GET_SIZE(co->co_cellvars); nfreevars = PyTuple_GET_SIZE(co->co_freevars); if (ncells || nfreevars) { if (map_to_dict(co->co_cellvars, ncells, locals, fast + co->co_nlocals, 1)) return -1; if (co->co_flags & CO_OPTIMIZED) { if (map_to_dict(co->co_freevars, nfreevars, locals, fast + co->co_nlocals + ncells, 1) < 0) return -1; } } return 0;\n} 可以看到，源码的实现逻辑和我们之前分析的是一样的。 变量 map 是符号表 co_varnames，保存了局部变量的名字； 变量 fast 是 f_localsplus，保存了局部变量的值； 变量 j 是局部变量的个数； 变量 locals 是局部名字空间； 然后将它们作为参数，传递给 map_to_dict 函数，该函数内部会进行遍历，按照顺序将变量名和变量值依次添加到局部名字空间中。然后我们再来看一下 map_to_dict 函数，它内部有一处细节非常之关键。 // Objects/frameobject.c static int\nmap_to_dict(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values, int deref)\n{ Py_ssize_t j; assert(PyTuple_Check(map)); assert(PyDict_Check(dict)); assert(PyTuple_Size(map) >= nmap); // nmap 表示局部变量的个数 for (j=0; j < nmap; j++) { // 从符号表中获取符号（变量名） PyObject *key = PyTuple_GET_ITEM(map, j); // values 就是 f_localsplus，然后获取变量的值 PyObject *value = values[j]; assert(PyUnicode_Check(key)); // 闭包变量相关，等介绍闭包的时候再说，由于当前不存在闭包，所以先忽略掉 if (deref && value != NULL) { assert(PyCell_Check(value)); value = PyCell_GET(value); } // 注意这一步：检测 value 是否等于 NULL，那么问题来了，什么时候 value 会等于 NULL 呢？ // 之前说了，局部变量有哪些在编译的时候就确定了，保存在符号表中，局部变量的值保存在 f_localsplus 中 // 在局部变量还没有赋值的时候，它在 f_localsplus 中对应的值就是 NULL // 而给一个局部变量赋值，本质上就是在修改 f_localsplus // 假设一个函数的符号表为 (\"a\", \"b\", \"c\")，在给变量 c 赋值之前调用了 locals() // 那么在获取变量 c 对应的值时，拿到的就是一个 NULL if (value == NULL) { // 如果某个符号对应的值为 NULL，则说明在获取名字空间时，该变量还没有被赋值 // 那么当该符号在 local 空间中已存在时，还要将它删掉。这一步非常关键，它的作用我们稍后会说 if (PyObject_DelItem(dict, key) != 0) { if (PyErr_ExceptionMatches(PyExc_KeyError)) PyErr_Clear(); else return -1; } } // 如果 value 不等于 NULL，说明变量已经完成了和某个值的绑定，于是将它们组成键值对拷贝到 local 空间中 else { if (PyObject_SetItem(dict, key, value) != 0) return -1; } } return 0;\n} 以上就是 local 名字空间的获取过程在源码层面的体现。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间的创建过程","id":"268","title":"local 名字空间的创建过程"},"269":{"body":"我们再来搭配 exec 关键字，结果会更加明显。首先 exec 函数可以将一段字符串当成代码来执行，并将执行结果体现在当前的名字空间中。 def foo(): print(locals()) # {} exec(\"x = 1\") print(locals()) # {'x': 1} try: print(x) except NameError as e: print(e) # name 'x' is not defined foo() 尽管 locals() 变了，但是依旧访问不到 x，因为虚拟机并不知道 exec(\"x = 1\") 是创建一个局部变量，它只知道这是一个函数调用。 事实上 exec 会作为一个独立的编译单元来执行，并且有自己的作用域。 所以 exec(\"x = 1\") 执行完之后，效果就是改变了局部名字空间，里面多了一个 \"x\": 1 键值对。但关键的是，局部变量 x 不是从局部名字空间中查找的，exec 终究还是错付了人。而由于函数 foo 对应的 PyCodeObject 对象的符号表中并没有 x 这个符号，所以报错了。 补充：exec 默认影响的是 local 名字空间，如果在执行时发现 local 名字空间为 NULL，那么会自动创建一个。所以调用 exec 也可以创建名字空间（当它为 NULL 时）。 exec(\"x = 1\")\nprint(x) # 1 如果放在模块里面是可以的，因为模块的 local 名字空间和 global 名字空间指向同一个字典，所以 global 名字空间会多一个 key 为 \"x\" 的键值对。而全局变量是从 global 名字空间中查找的，所以这里没有问题。 def foo(): # 此时 exec 影响的是 global 名字空间 exec(\"x = 123\", globals()) # 所以这里不会报错, 但此时的 x 不是局部变量, 而是全局变量 print(x) foo()\nprint(x)\n\"\"\"\n123\n123\n\"\"\" 可以给 exec 指定要影响的名字空间，代码中 exec 影响的是全局名字空间，打印的 x 也是全局变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » local 名字空间与 exec 函数","id":"269","title":"local 名字空间与 exec 函数"},"27":{"body":"前面我们介绍了 Python 对象在底层的数据结构，知道了 Python 底层是通过 PyObject 实现了对象的多态。所以我们先来分析一下 Python 为什么慢？ 在 Python 中创建一个对象，会分配内存并进行初始化，然后用一个 PyObject * 指针来维护这个对象，当然所有对象都是如此。因为指针是可以相互转化的，所以变量在保存一个对象的指针时，会将指针转成 PyObject * 之后再交给变量保存。 因此在 Python 中，变量的传递（包括函数的参数传递）实际上传递的都是泛型指针 PyObject *。这个指针具体指向什么类型的对象我们并不知道，只能通过其内部的 ob_type 字段进行动态判断，而正是因为这个 ob_type，Python 实现了多态机制。 比如 a.pop()，我们不知道 a 指向的对象是什么类型，它可能是列表、也可能是字典，或者是我们实现了 pop 方法的自定义类的实例对象。至于它到底是什么类型，只能通过 ob_type 动态判断。 如果 a 的 ob_type 为 &PyList_Type，那么 a 指向的对象就是列表，于是会调用 list 类型中定义的 pop 操作。如果 a 的 ob_type 为 &PyDict_Type，那么 a 指向的对象就是字典，于是会调用 dict 类型中定义的 pop 操作。所以变量 a 在不同的情况下，会表现出不同的行为，这正是 Python 多态的核心所在。 再比如列表，它内部的元素也都是 PyObject *，因为类型要保持一致，所以对象的指针不能直接存（因为类型不同），而是需要统一转成泛型指针 PyObject * 之后才可以存储。当我们通过索引获取到该指针进行操作的时候，也会先通过 ob_type 判断它的类型，看它是否支持指定的操作。所以操作容器内的某个元素，和操作一个变量并无本质上的区别，它们都是 PyObject *。 从这里我们也能看出 Python 为什么慢了，因为有一部分时间浪费在类型和属性的查找上面。 以变量 a + b 为例，这个 a 和 b 指向的对象可以是整数、浮点数、字符串、列表、元组、以及实现了 __add__ 方法的类的实例对象。因为 Python 的变量都是 PyObject *，所以它可以指向任意的对象，这就意味着 Python 无法做基于类型的优化。 底层在执行 a + b 时，首先要通过 ob_type 判断变量指向的对象是什么类型，这在 C 的层面需要一次属性查找。然后 Python 将每一个算术操作都抽象成了一个魔法方法，所以实例相加时要在类型对象中找到该方法对应的函数指针，这又是一次属性查找。找到了之后将 a、b 作为参数传递进去，这会产生一次函数调用，将对象维护的值拿出来进行运算，然后根据相加的结果创建一个新的对象，再将新的对象的指针转成 PyObject * 之后返回。 所以一个简单的加法运算，Python 内部居然做了这么多的工作，要是再放到循环里面，那么上面的步骤要重复 N 次。而对于 C 来讲，由于已经规定好了类型，所以 a + b 在编译之后就是一条简单的机器指令，因此两者在效率上差别很大。 当然我们不是来吐槽 Python 效率的问题，因为任何语言都有擅长的一面和不擅长的一面，这里只是通过回顾前面的知识来解释为什么 Python 效率低。因此当别人问你 Python 为什么效率低的时候，希望你能从这个角度来回答它，主要就两点： Python 无法基于类型做优化； Python 对象基本都存储在堆上； 建议不要一上来就谈 GIL，那是在多线程情况下才需要考虑的问题。而且我相信大部分觉得 Python 慢的人，都不是因为 Python 无法利用多核才觉得慢的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 为什么这么慢","id":"27","title":"Python 为什么这么慢"},"270":{"body":"我们说 exec 的执行效果会体现在 local 名字空间中，但是需要考虑变量名冲突的问题。举个例子： def foo(): exec(\"x = 1\") print(locals()[\"x\"]) foo()\n\"\"\"\n1\n\"\"\" def bar(): exec(\"x = 1\") print(locals()[\"x\"]) x = 123 bar()\n\"\"\"\nTraceback (most recent call last): File ..... bar() File ..... print(locals()[\"x\"])\nKeyError: 'x'\n\"\"\" 这是什么情况？函数 bar 只是多了一行赋值语句，为啥就报错了呢？要想搞懂这个问题，首先要明确两点： 1）函数的局部变量在编译的时候就已经确定，并存储在对应的 PyCodeObject 对象的符号表 (co_varnames) 中，这是由语法规则所决定的； 2）函数内的局部变量在其整个作用域范围内都是可见的； 对于 foo 函数来说，exec 执行完之后相当于往 local 名字空间中添加一个键值对，这没有问题。对于 bar 函数而言也是如此，在执行完 exec(\"x = 1\") 之后，local 名字空间中也会存在 \"x\": 1 这个键值对，但下面执行 locals() 的时候又把字典更新了。因为局部变量可以在函数的任意位置创建，或者修改，所以每一次执行 locals() 的时候，都会遍历符号表和 f_localsplus，组成键值对将原来的字典更新一遍。 在 bar 函数里面有一行 x = 123，所以知道函数里面存在局部变量 x，符号表里面也会有 \"x\" 这个符号，这是在编译时就确定的。但我们是在 x = 123 之前调用的 locals，所以此时符号 x 在 f_localsplus 中对应的值还是一个 NULL，没有指向一个合法的 PyObject。换句话说就是，知道里面存在局部变量 x，但是还没有来得及赋值。 然后在更新名字空间的时候，如果发现值是个 NULL，那么就把名字空间中该变量对应的键值对给删掉。 我们回顾一下 map_to_dict 函数： 所以 bar 函数执行 locals()[\"x\"] 的时候，会先获取名字空间，原本里面是有 \"x\": 1 这个键值对的。但因为赋值语句 x = 123 的存在，导致符号表里面存在 \"x\" 这个符号，但执行 locals() 的时候又尚未完成赋值，所以值为 NULL，于是又把这个键值对给删掉了。所以执行 locals()[\"x\"] 的时候，出现了 KeyError。 因为局部名字空间体现的是局部变量的值，而调用 locals 的时候，局部变量 x 还没有被创建。所以 locals() 里面不应该存在 key 为 \"x\" 的键值对，于是会将它删除。 我们将名字空间打印一下： def foo(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 但当前不存在局部变量，所以名字空间仍是 {\"x\": 1} print(locals()) def bar(): # 创建局部名字空间，并写入键值对 \"x\": 1 # 此时名字空间为 {\"x\": 1} exec(\"x = 1\") # 获取名字空间，会进行更新 # 由于里面存在局部变量 x，但尚未赋值 # 于是将字典中 key 为 \"x\" 的键值对给删掉 # 所以名字空间变成了 {} print(locals()) x = 123 foo() # {'x': 1}\nbar() # {} 上面代码中，局部变量的创建发生在 exec 之后，如果发生在 exec 之前也是相同的结果。 def foo(): exec(\"x = 2\") print(locals()) foo() # {'x': 2} def bar(): x = 1 exec(\"x = 2\") print(locals()) bar() # {'x': 1} 在 exec(\"x = 2\") 执行之后，名字空间也变成了 {\"x\": 2}。但从源码中我们看到，每次调用 locals，都会遍历符号表和 f_localsplus，对字典进行更新，所以在 bar 函数里面获取名字空间的时候，又把 \"x\" 对应的 value 给更新回来了。 当然这是在变量冲突的情况下，会保存真实存在的局部变量的值。但如果不冲突，比如 bar 函数里面是 exec(\"y = 2\")，那么 locals() 里面就会存在两个键值对。但只有 x 才是真正的局部变量，而 y 则不是。 将 exec(\"x = 2\") 换成 locals()[\"x\"] = 2 也是一样的效果，它们都是往局部名字空间中添加一个键值对，但不会创建一个局部变量。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 变量名冲突的问题","id":"270","title":"变量名冲突的问题"},"271":{"body":"当 Python 中混进一只薛定谔的猫…… ，这是猫哥在 19 年更新的一篇文章，里面探讨的内容我们本文的主题是重叠的。猫哥在文章中举了几个疑惑重重的例子，看看用上面学到的内容能不能合理地解释。 # 例 0\ndef foo(): exec('y = 1 + 1') z = locals()['y'] print(z) foo()\n# 输出：2 # 例 1\ndef foo(): exec('y = 1 + 1') y = locals()['y'] print(y) foo()\n# 报错：KeyError: 'y' 以上是猫哥文章中举的示例，首先例 0 很简单，因为 exec 影响了所在的局部名字空间，里面存在 \"y\": 2 这个键值对。至于里面的变量 z 则不影响，因为我们获取的是 \"y\" 这个 key 对应的 value。 但例 1 则不同，因为 Python 在语法解析的时候发现了 y = ... 这样的赋值语句，那么它在编译的时候就知道函数里面存在 y 这个局部变量，并写入符号表中。既然符号表中存在，那么调用 locals 的时候就会对它进行更新。但是对 y 赋值是发生在调用 locals 之后，所以在调用 locals 的时候，y 的值还是一个 NULL，也就是变量还没有赋值。所以会将名字空间中的 \"y\": 2 这个键值对给删掉，于是报出 KeyError 错误。 再来看看猫哥文章的例 2： # 例 2\ndef foo(): y = 1 + 1 y = locals()['y'] print(y) foo()\n# 输出：2 locals() 是对真实存在的局部变量的一个拷贝，在调用 locals 之前 y 就已经创建好了。符号表里面有 \"y\"，f_localsplus 里面有一个数值 2，所以调用 locals() 的时候，会得到 {\"y\": 2}，因此函数执行正常。 猫哥文章的例 3： # 例3\ndef foo(): exec('y = 1 + 1') boc = locals() y = boc['y'] print(y) foo()\n# KeyError: 'y' 这个例3 和例1 是一样的，只不过用变量 boc 将局部名字空间保存起来了。执行 exec 的时候，会创建局部名字空间，写入键值对 \"y\": 2。但调用 locals 的时候，发现函数内部存在局部变量 y 并且还尚未赋值，于是又会将 \"y\": 2 这个键值对给删掉，因此 boc 变成了一个空字典。 所以在执行 y = boc[\"y\"] 的时候会出现 KeyError。 猫哥文章的例 4： # 例4\ndef foo(): boc = locals() exec('y = 1 + 1') y = boc['y'] print(y) foo()\n# 输出：2 显然在调用 locals 的时候，会返回一个空字典，因为此时的局部变量都还没有赋值。但需要注意的是：boc 已经指向了局部名字空间（字典），而局部名字空间在一个函数里面也是唯一的。所以 exec(\"y = 1 + 1\") 执行之后，会往局部名字空间里面写入一个键值对，而变量 boc 指向的字典也会发生改变，因为是同一个字典，所以程序正常执行。 猫哥文章的例 5： # 例5\ndef foo(): boc = locals() exec('y = 1 + 1') print(locals()) y = boc['y'] print(y) foo()\n# {'boc': {...}} # KeyError: 'y' 首先在执行 boc = locals() 之后，boc 会指向一个空字典，然后 exec 函数执行之后会往字典里面写入一个键值对 \"y\": 2。如果在 exec 执行之后，直接执行 y = boc[\"y\"]，那么代码是没有问题的，但问题是执行之前插入了一个 print(locals())。 我们说过，当调用 locals 的时候，会对名字空间进行更新，然后返回更新之后的名字空间。由于函数内部存在 y = ... 这样的赋值语句，所以符号表中就存在 \"y\" 这个符号，于是会进行更新。但更新的时候，发现 y 还没有被赋值，于是又将字典中的键值对 \"y\": 2 给删掉了。 由于局部名字空间只有一份，所以 boc 指向的字典也会发生改变，换句话说在 print(locals()) 之后，boc 就指向了一个空字典，因此执行 y = boc[\"y\"] 时会出现 KeyError。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 薛定谔的猫","id":"271","title":"薛定谔的猫"},"272":{"body":"以上我们就探讨了 local 名字空间相关的内容，它是一个字典，是对真实存在的局部变量的一个拷贝，每当我们调用 locals，都会拷贝一次（但字典只会存在一份）。 然后函数的局部变量都是静态存储的，编译时就已经确定，无法在运行时动态添加。我们往局部名字空间里面添加键值对，并不等价于创建局部变量。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"59. 局部变量是怎么实现静态查找的，它和 local 名字空间又有什么联系呢？ » 小结","id":"272","title":"小结"},"273":{"body":"前面我们考察了虚拟机执行字节码指令的原理，那么本篇文章就来看看这些指令对应的逻辑是怎样的，每个指令都做了哪些事情。当然啦，由于字节码指令有一两百个，我们没办法逐一分析，这里会介绍一些常见的。至于其它的指令，会随着学习的深入，慢慢揭晓。 介绍完常见指令之后，我们会探讨 Python 赋值语句的背后原理，并分析它们的差异。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 楔子","id":"273","title":"楔子"},"274":{"body":"有一部分指令出现的频率极高，非常常用，我们来看一下。 LOAD_CONST：加载一个常量； LOAD_FAST：在局部作用域中加载一个局部变量； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量； LOAD_NAME：在全局作用域中加载一个全局变量或内置变量； STORE_FAST：在局部作用域中定义一个局部变量，来建立和某个对象之间的映射关系； STORE_GLOBAL：在局部作用域中定义一个使用 global 关键字声明的全局变量，来建立和某个对象之间的映射关系； STORE_NAME：在全局作用域中定义一个全局变量，来建议和某个对象之间的映射关系； 我们举例说明： import dis name = \"古明地觉\" def foo(): age = 16 print(age) global name print(name) name = \"古明地恋\" dis.dis(foo)\n\"\"\" 6 0 LOAD_CONST 1 (16) 2 STORE_FAST 0 (age) 7 4 LOAD_GLOBAL 0 (print) 6 LOAD_FAST 0 (age) 8 CALL_FUNCTION 1 10 POP_TOP 9 12 LOAD_GLOBAL 0 (print) 14 LOAD_GLOBAL 1 (name) 16 CALL_FUNCTION 1 18 POP_TOP 10 20 LOAD_CONST 2 ('古明地恋') 22 STORE_GLOBAL 1 (name) 24 LOAD_CONST 0 (None) 26 RETURN_VALUE\n\"\"\" 我们看到 age = 16 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 16； STORE_FAST：在局部作用域中创建一个局部变量，这里是 age； print(age) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_FAST：在局部作用域中加载一个局部变量，这里是 age； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； print(name) 对应四条字节码指令。 LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 print； LOAD_GLOBAL：在局部作用域中加载一个全局变量或内置变量，这里是 name； CALL_FUNCTION：函数调用； POP_TOP：从栈顶弹出返回值； name = \"古明地恋\" 对应两条字节码指令。 LOAD_CONST：加载一个常量，这里是 \"古明地恋\"； STORE_GLOBAL：在局部作用域中创建一个 global 关键字声明的全局变量，这里是 name； 这些指令非常常见，因为它们和常量、变量的加载，以及变量的定义密切相关，你写的任何代码在反编译之后都少不了它们的身影。 注：不管加载的是常量、还是变量，得到的永远是指向对象的指针。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 常用指令","id":"274","title":"常用指令"},"275":{"body":"这里再通过变量赋值感受一下字节码的执行过程，首先关于变量赋值，你平时是怎么做的呢？ 这些赋值语句背后的原理是什么呢？我们通过字节码来逐一回答。 1）a, b = b, a 的背后原理是什么？ 想要知道背后的原理，查看它的字节码是我们最好的选择。 1 0 LOAD_NAME 0 (b) 2 LOAD_NAME 1 (a) 4 ROT_TWO 6 STORE_NAME 1 (a) 8 STORE_NAME 0 (b) 10 LOAD_CONST 0 (None) 12 RETURN_VALUE 里面关键的就是 ROT_TWO 指令，虽然我们还没看这个指令，但也能猜出来它负责交换栈里面的两个元素。假设 a 和 b 的值分别为 22、33，看一下运行时栈的变化过程。 示意图还是很好理解的，关键就在于 ROT_TWO 指令，它是怎么交换元素的呢？ case TARGET(ROT_TWO): { // 获取栈顶元素 PyObject *top = TOP(); // 获取从栈顶开始的第二个元素（栈底元素） PyObject *second = SECOND(); // 将栈顶元素设置为 second，将栈的第二个元素设置为 top // 完成两个元素之间的交换 SET_TOP(second); SET_SECOND(top); FAST_DISPATCH();\n} 执行 ROT_TWO 指令之前，栈里有两个元素，栈顶元素是 a，栈底元素是 b。执行 ROT_TWO 指令之后，栈顶元素是 b，栈底元素是 a。然后后面的两个 STORE_NAME 会将栈里面的元素 b、a 依次弹出，赋值给 a、b，从而完成变量交换。 2）a, b, c = c, b, a 的背后原理是什么？ 老规矩，还是查看字节码，因为一切真相都隐藏在字节码当中。 1 0 LOAD_NAME 0 (c) 2 LOAD_NAME 1 (b) 4 LOAD_NAME 2 (a) 6 ROT_THREE 8 ROT_TWO 10 STORE_NAME 2 (a) 12 STORE_NAME 1 (b) 14 STORE_NAME 0 (c) 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 整个过程和 a, b = b, a 是相似的，首先 LOAD_NAME 将变量 c、b、a 依次压入栈中。由于栈先入后出的特性，此时栈的三个元素按照顺序（从栈顶到栈底）分别是 a、b、c。然后是 ROT_THREE 和 ROT_TWO，毫无疑问，这两个指令执行完之后，会将栈的三个元素调换顺序，也就是将 a、b、c 变成 c、b、a。最后 STORE_NAME 将栈的三个元素 c、b、a 依次弹出，分别赋值给 a、b、c，从而完成变量的交换。 因此核心就在 ROT_THREE 和 ROT_TWO 上面，由于后者上面已经说过了，所以我们看一下 ROT_THREE。 case TARGET(ROT_THREE): { PyObject *top = TOP(); PyObject *second = SECOND(); PyObject *third = THIRD(); SET_TOP(second); SET_SECOND(third); SET_THIRD(top); FAST_DISPATCH();\n} 栈顶元素是 top、栈的第二个元素是 second、栈的第三个元素是 third，然后将栈顶元素设置为 second、栈的第二个元素设置为 third、栈的第三个元素设置为 top。所以栈里面的 a、b、c 在经过 ROT_THREE 之后就变成了 b、c、a，显然这还不是正确的结果。于是继续执行 ROT_TWO，将栈的前两个元素进行交换，执行完之后就变成了 c、b、a。 假设 a、b、c 的值分别为 \"a\"、\"b\"、\"c\"，整个过程如下： 对于多元赋值来说，解释器的做法是固定的，首先按照从左往右的顺序，将等号右边的变量依次压入栈中，然后在栈里面对元素做处理，最后再将栈里的元素弹出，仍旧按照从左往右的顺序，依次赋值给等号左边的变量。 另外这里为了交换栈里的三个元素，使用了两个指令，但其实一个指令就够了，只需将栈顶元素和栈底元素进行交换即可，因为中间的元素是不需要动的。而在之后的版本中，官方优化了这个逻辑。 3）a, b, c, d = d, c, b, a 的背后原理是什么？它和上面提到的 1）和 2）有什么区别呢？ 我们还是看一下字节码。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_TUPLE 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 将等号右边的变量，按照从左往右的顺序，依次压入栈中，但此时没有直接将栈里面的元素做交换，而是构建一个元组。因为往栈里面压入了四个元素，所以 BUILD_TUPLE 后面的 oparg 是 4，表示构建长度为 4 的元组。 case TARGET(BUILD_TUPLE): { // 元素从栈顶到栈底依次是 a、b、c、d PyObject *tup = PyTuple_New(oparg); if (tup == NULL) goto error; // 将元素依次弹出，弹出的顺序也是 a、b、c、d // 但是注意循环，元素是从后往前设置的 // 所以 item[3], item[2], item[1], item[0] = a, b, c, d while (--oparg >= 0) { PyObject *item = POP(); PyTuple_SET_ITEM(tup, oparg, item); } // 将元组 item 压入栈中，元组为 (d, c, b, a) PUSH(tup); DISPATCH();\n} 此时栈里面只有一个元素，指向一个元组。接下来是 UNPACK_SEQUENCE，负责对序列进行解包，它的指令参数也是 4，表示要解包的序列的长度为 4，我们来看看它的逻辑。 case TARGET(UNPACK_SEQUENCE): { PREDICTED(UNPACK_SEQUENCE); // seq：从栈里面弹出的元组 (d, c, b, a) // item：用于遍历元素 // items：指向一个 PyObject * 类型的数组 PyObject *seq = POP(), *item, **items; if (PyTuple_CheckExact(seq) && PyTuple_GET_SIZE(seq) == oparg) { // 获取元组内部的 ob_item 字段，元素就存储在它指向的数组中 items = ((PyTupleObject *)seq)->ob_item; // 遍历内部的每一个元素，并依次压入栈中 // 由于是从后往前遍历的，所以遍历的元素依次是 a b c d // 但在压入栈中之后，元素从栈顶到栈底就变成了 d c b a while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } else if (PyList_CheckExact(seq) && PyList_GET_SIZE(seq) == oparg) { // 该指令同样适用于列表，逻辑一样（一会儿会看到） items = ((PyListObject *)seq)->ob_item; while (oparg--) { item = items[oparg]; Py_INCREF(item); PUSH(item); } } // ... Py_DECREF(seq); DISPATCH();\n} 最后 STORE_NAME 将 d c b a 依次弹出，赋值给变量 a b c d，从而完成变量交换。所以当交换的变量多了之后，不会直接在运行时栈里面操作，而是将栈里面的元素挨个弹出，构建元组；然后再按照指定顺序，将元组里面的元素重新压到栈里面。 假设变量 a b c d 的值分别为 1 2 3 4，我们画图来描述一下整个过程。 不管是哪一种做法，Python 在进行变量交换时所做的事情是不变的，核心分为三步走。首先将等号右边的变量，按照从左往右的顺序，依次压入栈中；然后对运行时栈里面元素的顺序进行调整；最后再将运行时栈里面的元素挨个弹出，还是按照从左往右的顺序，再依次赋值给等号左边的变量。 只不过当变量不多时，调整元素位置会直接基于栈进行操作；而当达到四个时，则需要额外借助于元组。 然后多元赋值也是同理，比如 a, b, c = 1, 2, 3，看一下它的字节码。 1 0 LOAD_CONST 0 ((1, 2, 3)) 2 UNPACK_SEQUENCE 3 4 STORE_NAME 0 (a) 6 STORE_NAME 1 (b) 8 STORE_NAME 2 (c) 10 LOAD_CONST 1 (None) 12 RETURN_VALUE 元组直接作为一个常量被加载进来了，然后解包，再依次赋值。 4）a, b, c, d = d, c, b, a 和 a, b, c, d = [d, c, b, a] 有区别吗？ 答案是没有区别，两者在反编译之后对应的字节码指令只有一处不同。 1 0 LOAD_NAME 0 (d) 2 LOAD_NAME 1 (c) 4 LOAD_NAME 2 (b) 6 LOAD_NAME 3 (a) 8 BUILD_LIST 4 10 UNPACK_SEQUENCE 4 12 STORE_NAME 3 (a) 14 STORE_NAME 2 (b) 16 STORE_NAME 1 (c) 18 STORE_NAME 0 (d) 20 LOAD_CONST 0 (None) 22 RETURN_VALUE 前者是 BUILD_TUPLE，现在变成了 BUILD_LIST，其它部分一模一样，并且解包用的依旧是 UNPACK_SEQUENCE 指令，所以两者的效果是相同的。当然啦，由于元组的构建比列表快一些，因此还是推荐第一种写法。 5）a = b = c = 123 背后的原理是什么？ 如果变量 a、b、c 指向的值相同，比如都是 123，那么便可以通过这种方式进行链式赋值。那么它背后是怎么做的呢？ 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 STORE_NAME 2 (c) 12 LOAD_CONST 1 (None) 14 RETURN_VALUE 出现了一个新的字节码指令 DUP_TOP，只要搞清楚它的作用，事情就简单了。 case TARGET(DUP_TOP): { // 获取栈顶元素，注意是获取、不是弹出 // TOP：查看元素，POP：弹出元素 PyObject *top = TOP(); // 增加指向对象的引用计数 Py_INCREF(top); // 压入栈中 PUSH(top); FAST_DISPATCH();\n} 所以 DUP_TOP 干的事情就是将栈顶元素拷贝一份，再重新压到栈里面。另外不管链式赋值语句中有多少个变量，模式都是一样的。 我们以 a = b = c = d = e = 123 为例： 1 0 LOAD_CONST 0 (123) 2 DUP_TOP 4 STORE_NAME 0 (a) 6 DUP_TOP 8 STORE_NAME 1 (b) 10 DUP_TOP 12 STORE_NAME 2 (c) 14 DUP_TOP 16 STORE_NAME 3 (d) 18 STORE_NAME 4 (e) 20 LOAD_CONST 1 (None) 22 RETURN_VALUE 将常量压入运行时栈，然后拷贝一份，赋值给 a；再拷贝一份，赋值给 b；再拷贝一份，赋值给 c；再拷贝一份，赋值给 d；最后自身赋值给 e。 当然啦，虽然 Python 一切皆对象，但拿到的都是指向对象的指针，所以这里拷贝的是指针。 以上就是链式赋值的秘密，其实没有什么好神奇的，就是将栈顶元素进行拷贝，再依次赋值。但是这背后有一个坑，就是给变量赋的值不能是可变对象，否则容易造成 BUG。 a = b = c = {} a[\"ping\"] = \"pong\"\nprint(a) # {'ping': 'pong'}\nprint(b) # {'ping': 'pong'}\nprint(c) # {'ping': 'pong'} 虽然 Python 一切皆对象，但对象都是通过指针来间接操作的。所以 DUP_TOP 是将字典的地址拷贝一份，而字典只有一个，因此最终 a、b、c 会指向同一个字典。 6）a is b 和 a == b 的区别是什么？ is 用于判断两个变量是不是引用同一个对象，也就是保存的对象的地址是否相等；而 == 则是判断两个变量引用的对象是否相等，等价于 a.__eq__(b) 。 Python 的变量在 C 看来只是一个指针，因此两个变量是否指向同一个对象，等价于 C 中的两个指针存储的地址是否相等； 而 Python 的 ==，则需要调用 PyObject_RichCompare，来比较它们指向的对象所维护的值是否相等。 这两个语句的字节码指令是一样的，唯一的区别就是指令 COMPARE_OP 的参数不同。 // a is b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 8 (is) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE // a == b 1 0 LOAD_NAME 0 (a) 2 LOAD_NAME 1 (b) 4 COMPARE_OP 2 (==) 6 POP_TOP 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 我们看到指令参数一个是 8、一个是 2，然后是 COMPARE_OP 指令的背后逻辑： case TARGET(COMPARE_OP): { // 弹出栈顶元素，这里是 b PyObject *right = POP(); // 显然 left 就是 a，因为 b 被弹出之后，a 就成为了新的栈顶元素 PyObject *left = TOP(); // 进行比较，比较结果为 res PyObject *res = cmp_outcome(tstate, oparg, left, right); // 减少 left 和 right 引用计数 Py_DECREF(left); Py_DECREF(right); // 将栈顶元素替换为 res SET_TOP(res); if (res == NULL) goto error; // 指令预测，暂时不用管，等介绍 if 控制流的时候再说 PREDICT(POP_JUMP_IF_FALSE); PREDICT(POP_JUMP_IF_TRUE); DISPATCH();\n} 所以逻辑很简单，核心就在 cmp_outcome 函数中。 // Python/ceval.c\nstatic PyObject *\ncmp_outcome(PyThreadState *tstate, int op, PyObject *v, PyObject *w)\n{ int res = 0; // op 就是 COMPARE_OP 指令的参数 switch (op) { // PyCmp_IS 是一个枚举变量，等于 8，定义在 Include/opcode.h 中 // 而 is 关键字，在 C 的层面就是一个 == 判断 case PyCmp_IS: res = (v == w); break; // is not 则对应 != case PyCmp_IS_NOT: res = (v != w); break; // in 关键字 case PyCmp_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; break; // not in 关键字 case PyCmp_NOT_IN: res = PySequence_Contains(w, v); if (res < 0) return NULL; res = !res; break; // except 关键字 case PyCmp_EXC_MATCH: if (PyTuple_Check(w)) { Py_ssize_t i, length; length = PyTuple_Size(w); for (i = 0; i < length; i += 1) { PyObject *exc = PyTuple_GET_ITEM(w, i); if (!PyExceptionClass_Check(exc)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } } else { if (!PyExceptionClass_Check(w)) { _PyErr_SetString(tstate, PyExc_TypeError, CANNOT_CATCH_MSG); return NULL; } } res = PyErr_GivenExceptionMatches(v, w); break; default: // 剩下的走 PyObject_RichCompare 逻辑 // 这是一个函数调用，比较对象维护的值是否相等 return PyObject_RichCompare(v, w, op); } v = res ? Py_True : Py_False; Py_INCREF(v); return v;\n} 我们实际举个栗子： a = 3.14\nb = float(\"3.14\")\nprint(a is b) # False\nprint(a == b) # True a 和 b 都是 3.14，两者是相等的，但不是同一个对象。 反过来也是如此，如果 a is b 成立，那么 a == b 也不一定成立。可能有人好奇，a is b 成立说明 a 和 b 指向的是同一个对象，那么 a == b 表示该对象和自己进行比较，结果应该始终是相等的呀，为啥也不一定成立呢？以下面两种情况为例： class Girl: def __eq__(self, other): return False g = Girl()\nprint(g is g) # True\nprint(g == g) # False __eq__ 返回 False，此时虽然是同一个对象，但是两者不相等。 import math\nimport numpy as np a = float(\"nan\")\nb = math.nan\nc = np.nan\nprint(a is a, a == a) # True False\nprint(b is b, b == b) # True False\nprint(c is c, c == c) # True False nan 是一个特殊的浮点数，意思是 not a number（不是一个数字），用于表示空值。而 nan 和所有数字的比较结果均为 False，即使是和它自身比较。 但需要注意的是，在使用 == 进行比较的时候虽然是不相等的，但如果放到容器里面就不一定了。举个例子： import numpy as np lst = [np.nan, np.nan, np.nan]\nprint(lst[0] == np.nan) # False\nprint(lst[1] == np.nan) # False\nprint(lst[2] == np.nan) # False\n# lst 里面的三个元素和 np.nan 均不相等 # 但是 np.nan 位于列表中，并且数量是 3\nprint(np.nan in lst) # True\nprint(lst.count(np.nan)) # 3 出现以上结果的原因就在于，元素被放到了容器里，而容器的一些 API 在比较元素时会先判定它们存储的对象的地址是否相同，即：是否指向了同一个对象。如果是，直接认为相等；否则，再去比较对象维护的值是否相等。可以理解为先进行 is 判断，如果结果为 True，直接判定两者相等；如果 is 操作的结果不为 True，再去进行 == 判断。 因此 np.nan in lst 的结果为 True，lst.count(np.nan) 的结果是 3，因为它们会先比较对象的地址。地址相同，则直接认为对象相等。 在用 pandas 做数据处理的时候，nan 是一个非常容易坑的地方。 提到 is 和 ==，那么问题来了，在和 True、False、None 比较时，是用 is 还是用 == 呢？由于 True、False、None 它们不仅是关键字，而且也被看做是一个常量，最重要的是它们都是单例的，所以我们应该用 is 判断。 另外 is 在底层只需要一个 == 即可完成，但 Python 的 ==，在底层则需要调用 PyObject_RichCompare 函数。因此 is 在速度上也更有优势，== 操作肯定比函数调用要快。 补充：判断对象是否相等，底层有两个常用的函数，分别是 PyObject_RichCompare 和 PyObject_RichCompareBool。 PyObject_RichCompare 是直接比较对象的值是否相等。而 PyObject_RichCompareBool 会先比较地址是否相等（即是否是同一个对象），如果是同一个对象，那么直接认为相等，否则再调用 PyObject_RichCompare 判断值是否相等。 对于容器的一些 API，在比较对象是否相等时，调用的都是 PyObject_RichCompareBool。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 变量赋值的具体细节","id":"275","title":"变量赋值的具体细节"},"276":{"body":"以上我们就分析了常见的几个指令，以及变量赋值的底层逻辑，怎么样，是不是对 Python 有更深的理解了呢。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"60. 剖析字节码指令，以及 Python 赋值语句的原理 » 小结","id":"276","title":"小结"},"277":{"body":"前面我们分析了虚拟机执行字节码的原理，并且也介绍了不少指令，但这些指令都是从上往下顺序执行的，不涉及任何的跳转。而像流程控制语句，比如 if、for、while、try 等等，它们在执行时会发生跳转，因此 Python 底层一定还存在相应的跳转指令。 那么从现在开始，就来分析一下这些流程控制语句的实现原理，本文先来介绍 if 语句。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 楔子","id":"277","title":"楔子"},"278":{"body":"if 语句应该是最简单也是最常用的流程控制语句，那么它的字节码是怎么样的呢？当然这里的 if 语句指的是 if elif else 整体，里面的某个条件叫做该 if 语句的分支。 我们看一下 if 语句的字节码长什么样子。 import dis code_string = \"\"\"\nscore = 90 if score >= 85: print(\"Good\") elif score >= 60: print(\"Normal\") else: print(\"Bad\")\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译得到的字节码指令比较多，我们来慢慢分析。另外为了阅读方便，源代码行号就不显示了。 // 加载常量 90 并压入运行时栈 0 LOAD_CONST 0 (90) // 加载符号表中索引为 0 的符号 \"score\"，弹出运行时栈的栈顶元素 90 // 然后将两者绑定起来，存放在当前的名字空间中 2 STORE_NAME 0 (score) // 加载变量 score 4 LOAD_NAME 0 (score) // 加载常量 85 6 LOAD_CONST 1 (85) // 进行比较，操作符是 >=，这个指令之前介绍过的 8 COMPARE_OP 5 (>=) // 如果比较结果为 False，就进行跳转，从名字也能看出指令的含义 // 那么跳转到什么地方呢？指令参数 22 表示跳转到偏移量为 22 的指令 // 很明显，就是当前分支的下一个分支。关于具体是怎么跳转的，一会儿说 10 POP_JUMP_IF_FALSE 22 // 如果走到这里说明没有跳转，当前分支的条件为真，那么开始执行该分支内部的逻辑 // 以下 4 条指令对应 print(\"Good\") 12 LOAD_NAME 1 (print) 14 LOAD_CONST 2 ('Good') 16 CALL_FUNCTION 1 18 POP_TOP // if 语句只有一个分支会被执行，如果执行了某个分支，那么整个 if 语句就结束了 // 于是向前跳转 26 个偏移量，来到偏移量为 48 的指令 20 JUMP_FORWARD 26 (to 48) // 对应 score >= 60\n>> 22 LOAD_NAME 0 (score) 24 LOAD_CONST 3 (60) 26 COMPARE_OP 5 (>=) // 如果比较结果为假，跳转到偏移量为 40 的指令 28 POP_JUMP_IF_FALSE 40 // 以下 4 条指令对应 print(\"Normal\") 30 LOAD_NAME 1 (print) 32 LOAD_CONST 4 ('Normal') 34 CALL_FUNCTION 1 36 POP_TOP // 向前跳转 8 个偏移量，来到偏移量为 48 的指令 38 JUMP_FORWARD 8 (to 48) // 最后一个是 else 分支，而 else 分支没有判断条件\n>> 40 LOAD_NAME 1 (print) 42 LOAD_CONST 5 ('Bad') 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明 if 语句结束了，而下面也没有代码了，于是返回 // 每个代码块对应的指令的最后都有一个 return\n>> 48 LOAD_CONST 6 (None) 50 RETURN_VALUE 我们看到字节码偏移量之前有几个 >> 这样的符号，显然这是 if 语句中的每一个分支开始的地方。 经过分析，整个 if 语句的字节码指令还是很简单的。就是从上到下依次判断每一个分支，如果某个分支条件成立，就执行该分支的代码，执行完毕后结束整个 if 语句；否则跳转到下一个分支。 显然核心就在于 POP_JUMP_IF_FALSE 指令，我们看一下它的逻辑。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » if 字节码","id":"278","title":"if 字节码"},"279":{"body":"COMPARE_OP 执行完之后会将比较的结果压入运行时栈，而 POP_JUMP_IF_FALSE 指令则是将结果从栈顶弹出并判断真假。如果为假，那么跳到下一个分支，否则执行此分支的代码。 case TARGET(POP_JUMP_IF_FALSE): { PREDICTED(POP_JUMP_IF_FALSE); // 从栈顶弹出比较结果 PyObject *cond = POP(); int err; // 如果 cond is True，说明当前分支的条件成立，那么执行下一条指令 if (cond == Py_True) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is False，那么通过 JUMPTO 跳转到 if 语句的下一个分支 // 关于 JUMPTO 一会儿介绍 if (cond == Py_False) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 到这里说明 cond 不是布尔值，那么调用 PyObject_IsTrue 并判断结果是否为真 // PyObject_IsTrue(cond)：等价于 Python 的 bool(cond) is True err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 cond 的布尔值为真，那么返回 1，此时什么也不做 // 最后会调用 DISPATCH()，去执行下一条指令 if (err > 0) ; // 如果 cond 的布尔值为假，那么返回 0，跳转到下一个 if 分支 else if (err == 0) JUMPTO(oparg); else goto error; DISPATCH();\n} 逻辑不难理解，但是里面出现了判断对象布尔值的函数，我们补充一下。 // Objects/object.c // 等价于 Python 的 bool(v) is True\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身就是布尔值 True，返回 1 if (v == Py_True) return 1; // 如果 v 本身就是布尔值 False，返回 0 if (v == Py_False) return 0; // 如果 v 是 None，返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且实现了 nb_bool（对应 __bool__） // 那么调用，如果结果不为 0，返回 1，否则返回 0 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且实现了 mp_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且实现了 sq_length（对应 __len__) // 那么调用，返回对象的长度 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 如果以上条件都不满足，直接返回 1，比如自定义类的实例对象（默认为真） else return 1; // 如果 res > 0 返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} // not 底层也调用了 PyObject_IsTrue\nint\nPyObject_Not(PyObject *v)\n{ int res; // 如果 v 是真，res == 1，那么 res == 0 结果是 0 // 如果 v 是假，res == 0，那么 res == 0 结果是 1 // 相当于取反 res = PyObject_IsTrue(v); if (res < 0) return res; return res == 0;\n} // Objects/boolobject.c\nstatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // <class 'bool'> 是一个 Python 类，这里的 bool_new 便是它的构造函数 PyObject *x = Py_False; long ok; // 不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 只接收 0 ~ 1 个参数，如果不传，那么默认返回 False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 PyObject_IsTrue，所以我们说 if v 和 if bool(v) 是等价的 // 因为当 v 不是布尔值时，if v 对应的指令内部会调用 PyObject_IsTrue // 而 bool(v) 也会调用 PyObject_IsTrue，所以两者是等价的 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 调用 PyBool_FromLong 创建布尔值，ok 为 1 返回 True，为 0 返回 False return PyBool_FromLong(ok);\n} PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 相信你现在明白了为什么 if 后面不跟布尔值也是可以的，因为有一个 C 函数 PyObject_IsTrue，可以判断任意对象的真假。如果 if 后面跟着的不是布尔值，那么会自动调用该函数。另外由于 bool(v) 也会调用该函数，所以 if v 和 if bool(v) 是等价的。 注：没有 PyObject_IsFalse。 说完了 POP_JUMP_IF_FALSE 指令，再补充一个和它相似的指令叫 POP_JUMP_IF_TRUE，它表示当比较结果为真时，跳到下一个分支，否则执行当前分支的代码。可能有人觉得，这不对吧，比较结果为真，难道不应该执行当前分支的逻辑吗？所以 POP_JUMP_IF_TRUE 指令似乎本身就是矛盾的。 仔细想想你应该能够猜到原因，答案就是使用了 not。 import dis code_string = \"\"\"\nif 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" code_string = \"\"\"\nif not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 正常情况下如果比较结果为 False，则跳转到 if 语句的下一个分支，所以 POP_JUMP_IF_FALSE 指令是合理的。至于 POP_JUMP_IF_TRUE 指令从逻辑上似乎就不该存在，因为它和 if 语句本身是相矛盾的。但现在我们明白了，该指令其实是为 not 关键字准备的。如果比较结果为真，那么 not 取反就是假，于是跳转到 if 语句的下一个分支，所以整个逻辑依旧是正确的。 当然这里只有一个 not，即使有很多个 not 也是可以的，尽管这没太大意义。 import dis # 这里有 4 个 not，因为是偶数个，两两相互抵消\n# 所以结果等价于 if 2 > 1\ncode_string = \"\"\"\nif not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\n# 只打印部分字节码\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_FALSE 16\n\"\"\" # 这里有 5 个 not，因为是奇数个，两两相互抵消之后还剩下一个\n# 所以结果等价于 if not 2 > 1\ncode_string = \"\"\"\nif not not not not not 2 > 1: print(\"古明地觉\")\n\"\"\"\ndis.dis(compile(code_string, \"<file>\", \"exec\"))\n\"\"\" 0 LOAD_CONST 0 (2) 2 LOAD_CONST 1 (1) 4 COMPARE_OP 4 (>) 6 POP_JUMP_IF_TRUE 16\n\"\"\" 然后再看一下 POP_JUMP_IF_TRUE 指令的内部逻辑，显然它和 POP_JUMP_IF_FALSE 是类似的。 case TARGET(POP_JUMP_IF_TRUE): { PREDICTED(POP_JUMP_IF_TRUE); // 弹出栈顶元素 PyObject *cond = POP(); int err; // 如果 cond is False，那么 not 之后就是 True // 所以当前 if 分支成立，于是执行下一条指令 if (cond == Py_False) { Py_DECREF(cond); FAST_DISPATCH(); } // 如果 cond is True，那么 not 之后就是 False // 因此跳转到下一个分支 if (cond == Py_True) { Py_DECREF(cond); JUMPTO(oparg); FAST_DISPATCH(); } // 说明 cond 不是布尔值，那么通过 PyObject_IsTrue 判断是否为真 // 为真返回 1，为假返回 0，出现错误的话返回 -1（基本不会发生） err = PyObject_IsTrue(cond); Py_DECREF(cond); // 如果 err > 0，说明布尔值为真，但还要进行 not 取反，因此最终整体为假 // 所以会跳转到下一个分支 if (err > 0) { JUMPTO(oparg); } // 如果 err == 0，说明布尔值为假，那么 not 取反之后整体为真 // 因此会执行当前分支内的逻辑，所以此处什么也不用做，直接 DISPATCH() 到下一条指令即可 else if (err == 0) ; else goto error; DISPATCH();\n} 以上就是 POP_JUMP_IF_FALSE 和 POP_JUMP_IF_TRUE 的内部逻辑，可以说非常简单。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » POP_JUMP_IF_FALSE","id":"279","title":"POP_JUMP_IF_FALSE"},"28":{"body":"然后来说一说 Python 的 C API，这个非常关键。首先 Python 解释器听起来很高大上，但按照陈儒老师的说法，它不过就是用 C 语言写出的一个开源软件，从形式上和其它软件并没有本质上的不同。 比如你在 Windows 系统中打开 Python 的安装目录，会发现里面有一个二进制文件 python.exe 和一个动态库文件 python38.dll。二进制文件负责执行，动态库文件则包含了相应的依赖，当然编译的时候也可以把动态库里的内容统一打包到二进制文件中，不过大部分软件在开发时都会选择前者。 既然解释器是用 C 写的，那么在执行时肯定会将 Python 代码翻译成 C 代码，这是毫无疑问的。比如创建一个列表，底层就会创建一个 PyListObject 实例，比如调用某个内置函数，底层会调用对应的 C 函数。 所以如果你想搞懂 Python 代码的执行逻辑或者编写 Python 扩展，那么就必须要清楚解释器提供的 API 函数。而按照通用性来划分的话，这些 API 可以分为两种。 泛型 API； 特定类型 API； 泛型 API 顾名思义，泛型 API 和参数类型无关，属于抽象对象层。这类 API 的第一个参数是 PyObject *，可以处理任意类型的对象，API 内部会根据对象的类型进行区别处理。 而且泛型 API 的名称也是有规律的，格式为 PyObject_###，我们举例说明。 所以泛型 API 一般以 PyObject_ 开头，第一个参数是 PyObject *，表示可以处理任意类型的对象。 特定类型 API 顾名思义，特定类型 API 和对象的类型是相关的，属于具体对象层，只能作用在指定类型的对象上面。因此不难发现，每种类型的对象，都有属于自己的一组特定类型 API。 // 通过 C 的 double 创建 PyFloatObject\nPyObject* PyFloat_FromDouble(double v); // 通过 C 的 long 创建 PyLongObject\nPyObject* PyLong_FromLong(long v);\n// 通过 C 的 char * 创建 PyLongObject\nPyObject* PyLong_FromString(const char *str, char **pend, int base) 以上就是解释器提供的两种 C API，了解完之后我们再来看看对象是如何创建的。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » Python 的 C API","id":"28","title":"Python 的 C API"},"280":{"body":"指令跳转是由 JUMPTO 实现的，它内部的逻辑长啥样呢？并且跳转除了 JUMPTO 之外，还有一个 JUMPBY，这两者有啥区别呢？ // Python/ceval.c #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 字节码指令的遍历是通过 next_instr 实现的，如果将指令执行的方向代表前进的方向。 JUMPTO(x)：表示从头开始向前跳转 x 个偏移量。 JUMPBY(x)：表示从当前指令所在的位置向前跳转 x 个偏移量。 所以 JUMPTO 表示绝对跳转，JUMPBY 表示相对跳转。不难发现，JUMPTO 既可以向前跳转（偏移量增大），也可以向后跳转（偏移量减小）；而 JUMPBY 只能向前跳转。 假设参数为 n，当前指令的偏移量为 m。对于 JUMPTO 而言，跳转之后的偏移量始终为 2n，如果 m < 2n 就是向前跳转，m > 2n 就是向后跳转。但对于 JUMPBY 而言，由于它是从当前待执行的指令开始跳转的，所以只能向前跳转（偏移量增大）。 另外在看字节码指令的时候，我们还看到了一个 JUMP_FORWARD 指令，当某个分支执行完毕之后，会直接跳转到 if 语句结束的下一条指令。并且不同分支对应的 JUMP_FORWARD 指令的参数是不同的，所以它内部一定使用了相对跳转。 case TARGET(JUMP_FORWARD): { JUMPBY(oparg); FAST_DISPATCH();\n} 我们分析的没错，它内部就是调用了一个 JUMPBY，因为终点相同、但跳转的偏移量不同，所以只能是相对跳转。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » JUMPTO","id":"280","title":"JUMPTO"},"281":{"body":"通过引入计算跳转，可以避免不必要的匹配。因为整个指令集合是已知的，这就说明某条指令在执行时，便可知道它的下一条指令是什么。所以当前指令处理完后，可以直接跳转到下一条指令对应的处理逻辑中，这就是计算跳转。但如果不使用计算跳转，那么每次读取到指令后，都要进入 switch，顺序匹配一百多个 case 分支，找到匹配成功的那一个。 因此使用计算跳转可以避免不必要的匹配，既然提前知道下一条指令是啥了，那么直接精确跳转就行，无需多走一遍 switch。不过要想实现计算跳转，需要 GCC 支持标签作为值，即 goto *label_addr 用法，由于 label_addr 是一个标签地址，那么解引用之后就是标签了。至于具体会跳转到哪一个标签，取决于 label_addr 保存了哪一个标签的地址，因此这种跳转是动态的，在运行时决定跳转目标。 goto 标签：静态跳转，标签需要显式地定义好，跳转位置在编译期间便已经固定。 goto *标签地址：动态跳转（计算跳转），跳转位置不固定，可以是已有标签中的任意一个。至于具体是哪一个，需要在运行时经过计算才能确定。 虚拟机为每个指令的处理逻辑都定义了一个标签，对于计算跳转来说，goto 的结果是 *标签地址，这个地址是运行时计算得出的。我们举个例子，随便看一段字节码指令集。 比如当前正在执行 LOAD_FAST 指令，那么下一条指令可以是 STORE_FAST、LOAD_FAST 以及 BUILD_LIST 等。当开启计算跳转时： 如果下一条指令是 STORE_FAST，那么之后就会跳转到 STORE_FAST 对应的标签； 如果下一条指令是 LOAD_FAST，那么之后就会跳转到 LOAD_FAST 对应的标签； 如果下一条指令是 BUILD_LIST，那么之后就会跳转到 BUILD_LIST 对应的标签； 所以在运行时判断指令的值，获取对应的标签，从而实现精确跳转，这就是计算跳转。当然这些内容在剖析虚拟机执行字节码时已经说过了，这里再回顾一下。 接下来说一说指令预测，不难发现，如果是计算跳转，那么指令预测功能貌似没啥用，因为总是能精确跳转到下一条指令对应的标签中。没错，指令预测只有在不使用计算跳转的情况下有用，那什么是指令预测呢？ 在不使用计算跳转时，goto 后面必须是一个静态的标签，跳转位置在编译阶段便已经固定，换句话说一个指令执行完毕后要跳转到哪一个标签是写死的，不能保证跳转后的标签正好对应下一条指令的处理逻辑。比如 LOAD_FAST 的下一条指令可以是 STORE_FAST 和 BUILD_LIST，那么应该跳转到哪一个指令对应的标签中呢？ 正因为这种不确定性，绝大部分指令在执行完毕后都会直接跳转到 fast_next_opcode 标签，然后顺序匹配 case 分支。 但也有那么几个指令，由于彼此的关联性很强，很多时候都是成对出现的，面对这样的指令，虚拟机会进行预测。比如 A 和 B 两个指令的关联性很强，尽管 A 的下一条指令除了是 B 之外，也有可能是其它指令，但 B 出现的概率是最大的，因此虚拟机会预测下一条指令是 B 指令。于是在执行完 A 指令之后，会验证自己的预测是否正确，即检测下一条指令是否是 B 指令。如果预测对了，可以实现精确跳转，如果预测错了，就只能回到 switch 语句逐一匹配 case 分支了。 总结一下：指令在执行时，它的下一条指令是已知的，但是不固定，有多种可能。如果不使用计算跳转，由于 goto 后面必须是一个写死的标签，而下一条指令却不固定，那么只能选择进入 switch、顺序匹配 case 分支。但也有那么几对指令，关联性很强，虽然不能保证百分百，但值得做一次尝试，这便是指令预测。 当然啦，如果使用计算跳转，情况则不一样了，此时压根用不到指令预测。因为 goto 后面是 *标签地址，而地址是可以动态获取的。由于所有标签的地址都保存在了一个数组中，不管接下来要处理哪一条指令，都可以获取到对应的标签地址，实现精确跳转。 好，关于指令预测我们已经知道是啥了，那么在源码层面又是如何体现的呢？在 POP_JUMP_IF_FALSE 指令中，我们看到有这么一行逻辑。 里面有一个宏 PREDICTED。 // Python/ceval.c\n#define PREDICTED(op) PRED_##op: 这个宏展开之后又是一个标签，由于调用时结尾加了分号，所以这还是一个空标签。整体效果如下： 那么展开成一个标签有什么用呢？首先肯定是为了跳转，至于具体过程我们再看一下 COMPARE_OP 指令就明白了。 COMPARE_OP 指令上面已经介绍了，它会对两个对象进行比较，并将比较结果压入运行时栈。之后它做了指令预测，并且还预测了两次，因为虚拟机认为 COMPARE_OP 执行完之后大概率会执行 POP_JUMP_IF_FALSE 或 POP_JUMP_IF_TRUE，所以做了一个预测。而相关逻辑位于 PREDICT 中，看一下它长什么样子。 // Python/ceval.c // 如果开启计算跳转，那么指令预测不生效，因为本身就知道该跳转到哪个指令对应的标签\n#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS\n#define PREDICT(op) if (0) goto PRED_##op\n#else\n// 如果不开启计算跳转，那么会比较预测的指令和实际的指令是否相等\n// 所以 COMPARE_OP 指令处理逻辑里面的 PREDICT(POP_JUMP_IF_FALSE)\n// 就是在判断下一条指令是不是自己预测的 POP_JUMP_IF_FALSE\n// 如果是，说明预测成功，那么 goto PRED_POP_JUMP_IF_FALSE\n// 否则说明预测失败，那么会执行 DISPATCH()，然后 goto 到 switch 语句所在位置\n#define PREDICT(op) \\ do{ \\ _Py_CODEUNIT word = *next_instr; \\ opcode = _Py_OPCODE(word); \\ if (opcode == op){ \\ oparg = _Py_OPARG(word); \\ next_instr++; \\ goto PRED_##op; \\ } \\ } while(0)\n#endif 以上便是指令预测，说白了就是如果指令 A 和指令 B 具有极高的关联性（甚至百分百），那么执行完 A 指令后会判断下一条指令是不是 B。如果是，那么直接跳转即可，就省去了匹配 case 分支的时间，如果不是，那就只能挨个匹配了。 因为是静态跳转，goto 后面的标签是写死的，编译阶段就确定了，所以只有那种关联度极高的指令才会开启预测功能，因为预测成功的概率比较高。但如果指令 A 的下一条指令有多种可能（假设有 6 种），并且每种指令出现的概率还差不多，那么这时不管预测哪一个，成功的概率都只有 1/6。显然这就不叫预测了，这是在掷骰子，因此对于这样的指令，虚拟机不会为它开启预测功能。 比如 LOAD_FAST 的下一个指令可以是 STORE_FAST、LOAD_FAST、BUILD_LIST 等等，不管预测哪一种，成功的概率都不是特别高，因此它没有进行指令预测。 所以就一句话：只有 A 和 B 两个指令的关联度极高的时候，执行 A 之后才会预测下一条指令是否是 B。预测成功直接跳转，预测失败执行 DISPATCH()，跳转到 fast_next_opcode 标签，进入 switch 语句。 但如果使用了计算跳转，情况就不一样了，此时不会开启指令预测，或者说指令预测里的逻辑会变得无效。 很明显，使用计算跳转后，PREDICT(op) 不会产生任何效果，因此也可以理解为没有开启指令预测。而之所以不用预测，是因为执行 DISPATCH() 的时候，本身就可以精确跳转到指定位置。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 指令预测","id":"281","title":"指令预测"},"282":{"body":"本篇文章我们就分析了 if 语句的实现原理，总的来说不难理解。依旧是在栈桢中执行字节码，只是多了一个指令跳转罢了，至于怎么跳转、跳转到什么地方，全部都体现在字节码中。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"61. 流程控制语句 if 是怎么实现的？ » 小结","id":"282","title":"小结"},"283":{"body":"在介绍 if 语句的时候，我们看到了最基本的控制流，其核心就是跳转。但是 if 只能向前跳转，而接下来介绍的 for、while 循环，指令是可以回退的，也就是向后跳转。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 楔子","id":"283","title":"楔子"},"284":{"body":"我们看一个简单的 for 循环的字节码。 import dis code_string = \"\"\"\nlst = [1, 2]\nfor item in lst: print(item)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 反编译之后，字节码指令如下。 // 加载常量 1，压入运行时栈 0 LOAD_CONST 0 (1) // 加载常量 2，压入运行时栈 2 LOAD_CONST 1 (2) // 将运行时栈的元素弹出，构建长度为 2 的列表，并压入栈中 4 BUILD_LIST 2 // 将上一步构建的列表从栈顶弹出，并用符号 lst 与之绑定 // 到此 lst = [1, 2] 便完成了 6 STORE_NAME 0 (lst) // 从全局名字空间中加载 lst 8 LOAD_NAME 0 (lst) // 获取对应的迭代器，即 iter(lst) 10 GET_ITER // 开始 for 循环，将里面的元素依次迭代出来 // 如果迭代结束，向前跳转 12 个偏移量，来到偏移量为 26 的指令\n>> 12 FOR_ITER 12 (to 26) // 到这里说明上一步迭代出元素了 // 用符号 item 和迭代出的元素进行绑定 14 STORE_NAME 1 (item) // 对应 print(item) 16 LOAD_NAME 2 (print) 18 LOAD_NAME 1 (item) 20 CALL_FUNCTION 1 22 POP_TOP // 到此，一次遍历就完成了，那么跳转到偏移量为 12 的指令，进行下一轮循环 // 注意：上面的 FOR_ITER 指令和这里的 JUMP_ABSOLUTE 指令的参数都是 12 // 但它们有着不同，FOR_ITER 指令的参数 12 表示从当前位置向前跳转 12 个偏移量 // 而 JUMP_ABSOLUTE 指令的参数 12 表示跳转到偏移量为 12 个位置（或者说从开头跳转 12 个偏移量） 24 JUMP_ABSOLUTE 12\n>> 26 LOAD_CONST 2 (None) 28 RETURN_VALUE 我们直接从 10 GET_ITER 开始看起，首先 for 循环遍历的对象必须是可迭代对象，然后会调用它的 __iter__ 方法，得到迭代器。再不断地调用迭代器的 __next__ 方法，一步一步将里面的值全部迭代出来，当出现 StopIteration 异常时，for 循环捕捉，最后退出。 另外，我们说 Python 里面是先有值，后有变量，for 循环也不例外。循环的时候，先将迭代器中的元素迭代出来，然后再让变量 item 指向。因此包含 10 个元素的迭代器，需要迭代 11 次才能结束。因为 for 循环事先是不知道迭代 10 次就能结束的，它需要再迭代一次，发现没有元素可以迭代、并捕获抛出的 StopIteration 之后，才能结束。 for 循环遍历可迭代对象时，会先拿到对应的迭代器，那如果遍历的就是一个迭代器呢？答案是依旧调用 __iter__，只不过由于本身就是一个迭代器，所以返回的还是其本身。 将元素迭代出来之后，就开始执行 for 循环体的逻辑了。 执行完一轮循环之后，通过 JUMP_ABSOLUTE 跳转到字节码偏移量为 12、也就是 FOR_ITER 的位置开始下一次循环。这里我们发现它没有跳到 GET_ITER 那里，所以可以得出结论，for 循环在遍历的时候只会创建一次迭代器。 下面来看指令对应的具体逻辑： case TARGET(GET_ITER): { // 获取栈顶元素，即上一步压入的列表指针 PyObject *iterable = TOP(); // 调用 PyObject_GetIter，获取对应的迭代器 // 这个函数在介绍迭代器的时候已经说过了 // 等价于 iter = type(iterable).__iter__(iterable) PyObject *iter = PyObject_GetIter(iterable); Py_DECREF(iterable); // 将迭代器 iter 设置为栈顶元素 SET_TOP(iter); if (iter == NULL) goto error; // 指令预测，解释器认为下一条指令大概率是 FOR_ITER 或 CALL_FUNCTION PREDICT(FOR_ITER); PREDICT(CALL_FUNCTION); DISPATCH();\n} 当创建完迭代器之后，就正式进入 for 循环了。所以从 FOR_ITER 开始，进入了虚拟机层面上的 for 循环。 源代码中的 for 循环，在虚拟机层面也一定对应着一个相应的循环控制结构。因为无论进行怎样的变换，都不可能在虚拟机层面利用顺序结构来实现源码层面上的循环结构，这也可以看作是程序的拓扑不变性。 因此源代码是宏观的，虚拟机执行字节码是微观的，尽管两者的层级不同，但本质上等价的，是程序从一种形式到另一种形式的等价转换。 我们来看一下 FOR_ITER 指令对应的具体实现： case TARGET(FOR_ITER): { PREDICTED(FOR_ITER); // 从栈顶获取迭代器对象（指针） PyObject *iter = TOP(); // 调用迭代器类型对象的 tp_iternext，将迭代器内的元素迭代出来 PyObject *next = (*iter->ob_type->tp_iternext)(iter); // 如果 next != NULL，说明迭代到元素了，那么压入运行时栈 if (next != NULL) { PUSH(next); PREDICT(STORE_FAST); PREDICT(UNPACK_SEQUENCE); DISPATCH(); } // 否则说明迭代出现异常 if (_PyErr_Occurred(tstate)) { // 如果异常还不是 StopIteration，那么跳转到 error 标签 if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) { goto error; } else if (tstate->c_tracefunc != NULL) { call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f); } // 否则说明是 StopIteration，那么证明迭代完毕，将异常清空 _PyErr_Clear(tstate); } // 迭代结束了，但运行时栈里面还有一个迭代器对象 // 那么要将它弹出，因此这里执行了 STACK_SHRINK(1) STACK_SHRINK(1); Py_DECREF(iter); // 跳转到 for 循环结束后的下一条指令 // 当前的指令为：12 FOR_ITER 12 (to 26) // 所以会通过 JUMPBY 实现一个相对跳转 // 从当前位置向前跳转 12 个偏移量，来到偏移量为 26 的指令 JUMPBY(oparg); PREDICT(POP_BLOCK); DISPATCH();\n} 在执行 FOR_ITER 的时候，如果迭代器没有耗尽，那么会迭代出元素，压入运行时栈，然后调用 DISPATCH() 去执行下一条指令。当一轮循环结束后，还要进行指令回退，从字节码中也看到了，for 循环遍历一次之后，会再次跳转到 FOR_ITER，而跳转所使用的指令就是 JUMP_ABSOLUTE，从名字也能看出这个指令会使用绝对跳转。 case TARGET(JUMP_ABSOLUTE): { PREDICTED(JUMP_ABSOLUTE); // 跳转到偏移量为 oparg 的指令 JUMPTO(oparg);\n#if FAST_LOOPS FAST_DISPATCH();\n#else DISPATCH();\n#endif\n} 之前介绍过 JUMPTO 和 JUMPBY 两个宏， #define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))\n#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT)) 这两个宏都表示跳转 x 个偏移量，但 JUMPTO 是从头开始跳转，所以只要 x 固定，那么跳转位置就始终是固定的。而 JUMPBY 表示从当前位置开始跳转，所以位置不同，跳转的结果也不同。 然后天下没有不散的宴席，随着迭代的进行，for 循环总有退出的那一刻，而这个退出的动作只能落在 FOR_ITER 的身上。在 FOR_ITER 指令执行的过程中，如果遇到了 StopIteration，就意味着迭代结束了。这个结果将导致虚拟机会将迭代器从运行时栈中弹出，同时执行一个 JUMPBY 动作，向前跳跃，在字节码的层面是向下，也就是偏移量增大的方向。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » for 控制流","id":"284","title":"for 控制流"},"285":{"body":"看完了 for，再来看看 while，并且我们还要分析两个关键字：break、continue。 import dis code_string = \"\"\"\na = 0\nwhile a < 10: a += 1 if a == 5: continue if a == 7: break print(a)\n\"\"\" dis.dis(compile(code_string, \"<file>\", \"exec\")) 看一下它的指令： // a = 0 0 LOAD_CONST 0 (0) 2 STORE_NAME 0 (a) // 比较 a < 10\n>> 4 LOAD_NAME 0 (a) 6 LOAD_CONST 1 (10) 8 COMPARE_OP 0 (<) // 如果 a < 10 为假，说明循环结束 // 跳转到偏移量为 50 的指令，内部会使用绝对跳转 10 POP_JUMP_IF_FALSE 50 // 到这里说明 while 条件成立，进入循环体 // 执行 a += 1 12 LOAD_NAME 0 (a) 14 LOAD_CONST 2 (1) 16 INPLACE_ADD 18 STORE_NAME 0 (a) // 比较 a == 5 20 LOAD_NAME 0 (a) 22 LOAD_CONST 3 (5) 24 COMPARE_OP 2 (==) // 如果 a == 5 为假，跳转到偏移量为 30 的指令 26 POP_JUMP_IF_FALSE 30 // 否则说明 a == 5 为真，执行 continue // 由于 continue 是立即进入下一轮循环 // 所以直接跳转到偏移量为 4 的指令，即 while 循环的开始位置 // 所以在虚拟机的层面，continue 就是一个跳转指令 28 JUMP_ABSOLUTE 4 // 比较 a == 7\n>> 30 LOAD_NAME 0 (a) 32 LOAD_CONST 4 (7) 34 COMPARE_OP 2 (==) // 如果 a == 7 为假，跳转到偏移量为 40 的指令 36 POP_JUMP_IF_FALSE 40 // 否则说明 a == 7 为真，执行 break // 因此直接跳转到偏移量为 50 的位置，即 while 循环结束后的下一条指令 38 JUMP_ABSOLUTE 50 // print(a)\n>> 40 LOAD_NAME 1 (print) 42 LOAD_NAME 0 (a) 44 CALL_FUNCTION 1 46 POP_TOP // 到这里说明一轮循环结束了，那么跳转到偏移量为 4 的位置，即 while 循环的开始位置 48 JUMP_ABSOLUTE 4 // 隐式的 return None\n>> 50 LOAD_CONST 5 (None) 52 RETURN_VALUE 有了 for 循环，再看 while 循环就简单多了，整体逻辑和 for 高度相似，当然里面还结合了 if。 刚才说了，尽管源代码和字节码的层级不同，但本质上是等价的，是程序从一种形式到另一种形式的等价转换。在源码中能看到的，在字节码当中也能看到。比如源代码中的 continue 会跳转到循环所在位置，那么在字节码中自然也会对应一个跳转指令。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » while 控制流","id":"285","title":"while 控制流"},"286":{"body":"以上我们就探讨了 Python 的两种循环，总的来说没什么难度，本质上还是跳转。只不过有时会通过 JUMPTO 进行绝对跳转，有时会通过 JUMPBY 进行相对跳转。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"62. 流程控制语句 for、while 是怎么实现的？ » 小结","id":"286","title":"小结"},"287":{"body":"程序在运行的过程中，总是会不可避免地产生异常，此时为了让程序不中断，必须要将异常捕获掉。如果能提前得知可能会发生哪些异常，建议使用精确捕获，如果不知道会发生哪些异常，则使用 Exception 兜底。 另外异常也可以用来传递信息，比如生成器。 def gen(): yield 1 yield 2 return \"result\" g = gen()\nnext(g)\nnext(g)\ntry: next(g)\nexcept StopIteration as e: print(f\"返回值: {e.value}\") # 返回值: result 如果想要拿到生成器的返回值，我们需要让它抛出 StopIteration，然后进行捕获，再通过 value 属性拿到返回值。所以，Python 是将生成器的返回值封装到了异常里面。 之所以举这个例子，目的是想说明，异常并非是让人嗤之以鼻的东西，它也可以作为信息传递的载体。特别是在 Java 语言中，引入了 checked exception，方法的所有者还可以声明自己会抛出什么异常，然后调用者对异常进行处理。在 Java 程序启动时，抛出大量异常都是司空见惯的事情，并在相应的调用堆栈中将信息完整地记录下来。至此，Java 的异常不再是异常，而是一种很普遍的结构，从良性到灾难性都有所使用，异常的严重性由调用者来决定。 虽然在 Python 里面，异常还没有达到像 Java 异常那么高的地位，但使用频率也是很高的，下面我们就来剖析一下异常是怎么实现的？","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 楔子","id":"287","title":"楔子"},"288":{"body":"Python 解释器 = Python 编译器 + Python 虚拟机，所以异常可以由编译器抛出，也可以由虚拟机剖出。如果是编译器抛出的异常，那么基本上都是 SyntaxError，即语法错误。 try: >>>\nexcept Exception as e: print(e) 比如上面这段代码，你会发现异常捕获根本没用，因为这是编译阶段就发生的错误，而异常捕获是在运行时进行的。当然语法不对属于低级错误，所以不会留到运行时。 然后是运行时产生的异常： try: 1 / 0\nexcept ZeroDivisionError: print(\"Division by zero\") 像这种语法正确，但程序执行时因逻辑出现问题而导致的异常，是可以被捕获的。对于我们来说，关注的显然是运行时产生的异常，比如 TypeError、IndexError 等等。 那么问题来了，异常本质上是什么呢？我们以列表为例，看看 IndexError 是怎么产生的。 lst = [1, 2, 3]\nprint(lst[3])\n\"\"\"\nIndexError: list index out of range\n\"\"\" 列表的最大索引是 2，但我们访问了索引为 3 的元素，虚拟机就知道不能再执行下去了，否则会访问非法内存。因此虚拟机的做法是：输出异常信息，结束进程。我们通过源码来验证一下： 在获取列表元素时发现索引不合法，就知道要抛出 IndexError 了，于是将异常写入到回溯栈中，并返回 NULL。正常情况下，返回值应该指向一个合法的对象，如果为 NULL，证明出现异常了。 此时虚拟机会将回溯栈里的异常抛出来（就是我们在控制台看到的那一抹鲜红），然后结束进程，这就是异常的本质。当然异常也是一个 Python 对象，虚拟机在退出前，会写入到 stderr 中。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常的本质是什么？","id":"288","title":"异常的本质是什么？"},"289":{"body":"当我们用 C 编写 Python 扩展时，如果想设置异常的话，该怎么做呢？首先设置异常之前，我们要知道有哪些异常。在 pyerrors.h 中，虚拟机内置了大量的异常，另外 Python 一切皆对象，因此异常也是一个对象。 有了异常之后，怎么写入呢？关于异常写入，底层也提供了相应的 C API。 PyErr_SetNone：设置异常，不包含提示信息。 PyErr_SetObject：设置异常，包含提示信息（Python 字符串）。 PyErr_SetString：设置异常，包含提示信息（C 字符串）。 PyErr_Occurred：检测回溯栈中是否有异常产生。 PyErr_Clear：将回溯栈中的异常清空，相当于 Python 的异常捕获。 PyErr_Fetch：将回溯栈中的异常清空，同时拿到它的 exc_type、exc_value、exc_tb。 PyErr_Restore：基于 exc_type、exc_value、exc_tb 设置异常。 我们以 PyErr_Restore 为例，看看异常的具体设置过程。 // Python/errors.c // PyErr_SetObject、PyErr_SetString 等等，最终都会调用 PyErr_Restore\nvoid\nPyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)\n{ // 获取线程状态对象 PyThreadState *tstate = _PyThreadState_GET(); _PyErr_Restore(tstate, type, value, traceback);\n} // 将异常设置在线程状态对象中\nvoid\n_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value, PyObject *traceback)\n{ PyObject *oldtype, *oldvalue, *oldtraceback; if (traceback != NULL && !PyTraceBack_Check(traceback)) { Py_DECREF(traceback); traceback = NULL; } // 获取线程状态对象中已存在的异常（可能为空） oldtype = tstate->curexc_type; oldvalue = tstate->curexc_value; oldtraceback = tstate->curexc_traceback; // 将新异常设置在线程状态对象中 tstate->curexc_type = type; tstate->curexc_value = value; tstate->curexc_traceback = traceback; // 减少旧异常的引用计数 Py_XDECREF(oldtype); Py_XDECREF(oldvalue); Py_XDECREF(oldtraceback);\n} 注意这里的 PyThreadState 对象，它是与线程相关的，但它只是线程信息的一个抽象描述，而真实的线程及状态肯定是由操作系统来维护和管理的。 但虚拟机在运行的时候总需要另外一些与线程相关的状态和信息，比如是否发生了异常等等，而这些信息显然操作系统是没办法提供的。而 PyThreadState 对象正是 Python 为线程准备的、在虚拟机层面保存线程状态信息的对象（后面简称线程状态对象、或者线程对象）。 当前活动线程（OS 原生线程）对应的 PyThreadState 对象可以通过 PyThreadState_GET 获得，在得到了线程状态对象之后，就将异常信息存放在里面。 关于线程相关的内容，后续会详细说。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 异常写入的一些 C API","id":"289","title":"异常写入的一些 C API"},"29":{"body":"创建对象可以使用泛型 API，也可以使用特定类型 API，比如创建一个浮点数。 使用泛型 API 创建 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type); 通过泛型 API 可以创建任意类型的对象，因为该类 API 和类型无关。那么问题来了，解释器怎么知道要给对象分配多大的内存呢？ 在介绍类型对象的时候我们提到，对象的内存大小、支持哪些操作等等，都属于元信息，而元信息会存在对应的类型对象中。其中 tp_basicsize 和 tp_itemsize 负责指定实例对象所需的内存空间。 // Include/objimpl.h // 创建定长对象\n#define PyObject_New(type, typeobj) \\ ( (type *) _PyObject_New(typeobj) )\n// 创建变长对象\n#define PyObject_NewVar(type, typeobj, n) \\ ( (type *) _PyObject_NewVar((typeobj), (n)) )\n/* 所以 PyObject* pi = PyObject_New(PyObject, &PyFloat_Type) 等价于如下 * PyObject* pi = (PyObject *)_PyObject_New(&PyFloat_Type) */ 所以实际申请内存的动作由 _PyObject_New 和 _PyObject_NewVar 负责，看看它的逻辑。 // Objects/object.c\nPyObject *\n_PyObject_New(PyTypeObject *tp)\n{ PyObject *op; // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_SIZE(tp) op = (PyObject *) PyObject_MALLOC(_PyObject_SIZE(tp)); if (op == NULL) return PyErr_NoMemory(); // 设置对象的类型和引用计数 return PyObject_INIT(op, tp);\n} PyVarObject *\n_PyObject_NewVar(PyTypeObject *tp, Py_ssize_t nitems)\n{ PyVarObject *op; const size_t size = _PyObject_VAR_SIZE(tp, nitems); // 通过 PyObject_Malloc 为对象申请内存，大小为 _PyObject_VAR_SIZE(tp, nitems) op = (PyVarObject *) PyObject_MALLOC(size); if (op == NULL) return (PyVarObject *)PyErr_NoMemory(); // 设置对象的类型、引用计数和 ob_size return PyObject_INIT_VAR(op, tp, nitems);\n} // Include/objimpl.h\n#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) #define _PyObject_VAR_SIZE(typeobj, nitems) \\ _Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \\ (nitems)*(typeobj)->tp_itemsize, \\ SIZEOF_VOID_P)\n/* 类型对象的 tp_basicsize 字段表示它的实例对象的基础大小，即底层结构体的大小 * 对于像浮点数这种不可变的定长对象来说，显然大小就等于 PyFloat_Type 的 tp_basicsize * * 如果对象内部可以容纳指定数量的元素，比如元组，那么 tp_itemsize 便是每个元素的大小 * 对于元组来说，它的大小等于 tp_basicsize + 元素个数 * tp_itemsize，并且按照 8 字节对齐 */ 以上便是泛型 API 创建对象的流程，但泛型 API 属于通用逻辑，而内置类型的实例对象一般会采用特定类型 API 创建。 使用特定类型 API 创建 // 创建浮点数，值为 2.71\nPyObject* e = PyFloat_FromDouble(2.71);\n// 创建一个可以容纳 5 个元素的元组\nPyObject* tpl = PyTuple_New(5);\n// 创建一个可以容纳 5 个元素的列表\n// 当然这是初始容量，列表还可以扩容\nPyObject* lst = PyList_New(5); 和泛型 API 不同，使用特定类型 API 只能创建指定类型的对象，因为这种 API 是和类型绑定的。比如我们可以用 PyDict_New 创建一个字典，但不可能创建一个集合出来。 如果使用特定类型 API，那么可以直接分配内存。因为内置类型的实例对象，它们的定义在底层都是写死的，解释器对它们了如指掌，因此可以直接分配内存并初始化。 比如通过 e = 2.71 创建一个浮点数，解释器看到 2.71 就知道要创建 PyFloatObject 结构体实例，那么申请多大内存呢？显然是 sizeof(PyFloatObject)，直接计算一下结构体实例的大小即可。 // Include/floatobject.h\ntypedef struct { // ob_refcnt 占 8 字节，ob_type 也占 8 字节 PyObject_HEAD // 占 8 字节 double ob_fval;\n} PyFloatObject; 由于 PyFloatObject 只是在 PyObject 的基础上引入了一个 double 字段，用于维护浮点数的值，所以一个 PyFloatObject 实例的大小为 24 字节。既然内存大小知道，那么直接分配就可以了，分配之后再将 ob_refcnt 初始化为 1、将 ob_type 设置为 &PyFloat_Type、将 ob_fval 设置为 2.71 即可。 同理可变对象也是一样，因为字段都是固定的，容纳的元素个数也可以根据赋的值得到，所以内部的所有字段占用了多少内存可以算出来，因此也是可以直接分配内存的。 还是那句话，解释器对内置的数据结构了如指掌，因为这些结构在底层都是定义好的，源码直接写死了。所以解释器根本不需要借助类型对象去创建实例对象，它只需要在实例对象创建完毕之后，再将 ob_type 设置为指定的类型即可（让实例对象和类型对象建立联系）。 所以采用特定类型 API 创建实例的速度会更快，但这只适用于内置的数据结构，而我们自定义类的实例对象显然没有这个待遇。假设通过 class Person: 定义了一个类，那么在实例化的时候，显然不可能通过 PyPerson_New 去创建，因为底层压根就没有这个 API。这种情况下创建 Person 的实例对象就需要 Person 这个类型对象了，因此自定义类的实例对象如何分配内存、如何进行初始化，需要借助对应的类型对象。 总的来说，Python 内部创建一个对象有两种方式： 通过特定类型 API，适用于内置数据结构，即内置类型的实例对象。 通过调用类型对象去创建（底层会调用泛型 API），多用于自定义类型。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 对象是如何创建的","id":"29","title":"对象是如何创建的"},"290":{"body":"帧评估函数里面有一个巨型的 switch，负责执行字节码指令，如果执行出错，那么跳转到 error 标签。 如果在执行指令的时候出现了异常，那么会跳转到 error 这里，否则会跳转到其它地方。另外当出现异常时，会在线程状态对象中将异常信息记录下来，包括异常类型、异常值、回溯栈（traceback），这个 traceback 就是在 error 标签中调用 PyTraceBack_Here 创建的。 另外可能有人不清楚 traceback 是做什么的，我们举个 Python 的例子。 def h(): 1 / 0 def g(): h() def f(): g() f()\n\"\"\"\nTraceback (most recent call last): File \"/Users/.../main.py\", line 10, in <module> f() File \"/Users/.../main.py\", line 8, in f g() File \"/Users/.../main.py\", line 5, in g h() File \"/Users/.../main.py\", line 2, in h 1 / 0\nZeroDivisionError: division by zero\n\"\"\" 这是脚本运行时产生的错误输出，我们看到了函数调用的信息：比如在源代码的哪一行调用了哪一个函数，那么这些信息是从何而来的呢？没错，显然是 traceback 对象。虚拟机在处理异常的时候，会创建 traceback 对象，在该对象中记录栈帧的信息。虚拟机利用该对象来将栈帧链表中每一个栈帧的状态进行可视化，可视化的结果就是上面输出的异常信息。 而且我们发现输出的信息也是一个链状的结构，因为每一个栈帧都会对应一个 traceback 对象，这些 traceback 对象之间也会组成一个链表。 所以当虚拟机开始处理异常的时候，它首先的动作就是创建 traceback 对象，用于记录异常发生时活动栈帧的状态。创建方式是通过 PyTraceBack_Here 函数，它接收一个栈帧作为参数。 // Python/traceback.c\nint\nPyTraceBack_Here(PyFrameObject *frame)\n{ // 获取当前的异常对象，拿到它的 exc_type、exc_val、exc_tb PyObject *exc, *val, *tb, *newtb; PyErr_Fetch(&exc, &val, &tb); // 创建新的 traceback 对象，并和旧的 traceback 对象组成链表 newtb = _PyTraceBack_FromFrame(tb, frame); if (newtb == NULL) { _PyErr_ChainExceptions(exc, val, tb); return -1; } // 将异常设置在线程状态对象中 // 并且异常的 exc_type 和 exc_val 保持不变，但 traceback 是新的 traceback PyErr_Restore(exc, val, newtb); Py_XDECREF(tb); return 0;\n} 那么这个 traceback 对象究竟长什么样呢？ // Include/cpython/traceback.h\ntypedef struct _traceback { PyObject_HEAD struct _traceback *tb_next; struct _frame *tb_frame; int tb_lasti; int tb_lineno;\n} PyTracebackObject; 里面有一个 tb_next，所以很容易想到 traceback 也是一个链表结构。其实 traceback 对象的链表结构跟栈帧对象的链表结构是同构的、或者说一一对应的，即一个栈帧对象对应一个 traceback 对象。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 是什么？","id":"290","title":"traceback 是什么？"},"291":{"body":"在 PyTraceBack_Here 函数中我们看到，traceback 对象是通过 _PyTraceBack_FromFrame 创建的，那么秘密就隐藏在这个函数中。 // Python/traceback.c\n_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)\n{ assert(tb_next == NULL || PyTraceBack_Check(tb_next)); assert(frame != NULL); return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_lasti, PyFrame_GetLineNumber(frame));\n} static PyObject *\ntb_create_raw(PyTracebackObject *next, PyFrameObject *frame, int lasti, int lineno)\n{ PyTracebackObject *tb; if ((next != NULL && !PyTraceBack_Check(next)) || frame == NULL || !PyFrame_Check(frame)) { PyErr_BadInternalCall(); return NULL; } // 为 traceback 对象申请内存 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type); if (tb != NULL) { // 设置属性 Py_XINCREF(next); tb->tb_next = next; Py_XINCREF(frame); tb->tb_frame = frame; tb->tb_lasti = lasti; tb->tb_lineno = lineno; PyObject_GC_Track(tb); } return (PyObject *)tb;\n} tb_next 将两个 traceback 连接了起来，不过这个和栈帧的 f_back 正好相反，f_back 指向的是上一个栈帧，而 tb_next 指向的是下一个 traceback。 另外在 traceback 中，还通过 tb_frame 字段和对应的 PyFrameObject 对象建立了联系，当然还有最后执行完毕时的字节码偏移量、以及在源代码中对应的行号。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » traceback 创建","id":"291","title":"traceback 创建"},"292":{"body":"traceback 的创建我们知道了，那么它和栈帧对象是怎么联系起来的呢？我们还以之前的代码为例，来解释一下。 def h(): 1 / 0 def g(): h() def f(): g() f() 当执行到函数 h 的 1 / 0 这行代码时，底层会执行 BINARY_TRUE_DIVIDE 指令。 case TARGET(BINARY_TRUE_DIVIDE): { PyObject *divisor = POP(); PyObject *dividend = TOP(); // 调用了数值型对象的泛型 API PyObject *quotient = PyNumber_TrueDivide(dividend, divisor); Py_DECREF(dividend); Py_DECREF(divisor); SET_TOP(quotient); if (quotient == NULL) goto error; DISPATCH();\n} // Objects/abctract.c\nPyObject *\nPyNumber_TrueDivide(PyObject *v, PyObject *w)\n{ return binary_op(v, w, NB_SLOT(nb_true_divide), \"/\");\n} #define NB_SLOT(x) offsetof(PyNumberMethods, x)\n// 最终会执行 (&PyLong_Type) -> tp_as_methods -> nb_true_divide\n// 即 long_true_divice 函数，看一下它的逻辑 // Objects/longobject.c\nstatic PyObject *\nlong_true_divide(PyObject *v, PyObject *w)\n{ // ... a_size = Py_ABS(Py_SIZE(a)); b_size = Py_ABS(Py_SIZE(b)); negate = (Py_SIZE(a) < 0) ^ (Py_SIZE(b) < 0); // 如果除数为 0，设置 ZeroDivisionError if (b_size == 0) { PyErr_SetString(PyExc_ZeroDivisionError, \"division by zero\"); goto error; } // ... error: return NULL;\n} 由于除数为 0，因此会通过 PyErr_SetString 设置一个异常进去，最终将异常类型、异常值、以及 traceback 保存到线程状态对象中。然后跳转到 error 标签，注意：当前是 long_true_divide 的 error 标签，然后会返回 NULL。 当 long_true_divide 返回 NULL 时，那么变量 quotient 拿到的就是 NULL，由于没有指向一个合法的 PyObject，虚拟机就意识到发生异常了，这时候会跳转到 error 标签。注意：这个 error 标签是帧评估函数里的 error 标签。 在里面会先取出线程状态对象中已有的 traceback 对象，然后以函数 h 的栈帧为参数，创建一个新的 traceback 对象，将两者通过 tb_next 关联起来。最后，再替换掉线程状态对象里面的 traceback 对象。 在虚拟机意识到有异常抛出，并创建了 traceback 之后，它会在当前栈帧中寻找 try except 语句，来执行开发人员指定的异常捕捉动作。如果没有找到，那么虚拟机将退出当前的活动栈帧，并沿着栈帧链回退到上一个栈帧（这里是函数 g 的栈帧），在上一个栈帧中寻找 try except 语句。 就像我们之前说的，函数调用会创建栈帧，当函数执行完毕或者出现异常时，会回退到上一级栈帧。一层一层创建、一层一层返回。至于回退的这个动作，则是在 _PyEval_EvalFrameDefault 的最后完成。 当出现异常时，虚拟机会进入 exception_unwind 标签寻找异常捕获逻辑，相关细节下一篇文章再说，这里就让它抛出去。然后来到 exit_returning 标签，将运行时栈清空。最后进入 exit_eval_frame 标签，将当前线程状态对象中的活跃栈帧设置为上一级栈帧，从而完成栈帧回退的动作。 当栈帧回退时，会进入函数 g 的栈帧，由于返回值为 NULL，所以知道自己调用的函数 h 的内部发生异常了（否则返回值一定会指向一个合法的 PyObject），那么继续寻找异常捕获语句。对于当前这个例子来说，显然是找不到的，于是会从线程状态对象中取出已有的 traceback 对象（函数 h 的栈帧对应的 traceback），然后以函数 g 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 异常会沿着栈帧链进行反向传播，函数 h 出现的异常被传播到了函数 g 中，显然接下来函数 g 要将异常传播到函数 f 中。因为函数 g 在无法捕获异常时，那么返回值也是 NULL，而函数 f 看到返回值为 NULL 时，同样会去寻找异常捕获语句。但是找不到，于是会从线程状态对象中取出已有的 traceback 对象（此时是函数 g 的栈帧对应的 traceback），然后以函数 f 的栈帧为参数，创建新的 traceback 对象，再将两者通过 tb_next 关联起来，并重新设置到线程状态对象中。 最后再传播到模块对应的栈帧中，如果还无法捕获发生的异常，那么虚拟机就要将异常抛出来了。 这个沿着栈帧链不断回退的过程我们称之为栈帧展开，在栈帧展开的过程中，虚拟机不断地创建与各个栈帧对应的 traceback，并将其链接成链表。 由于没有异常捕获，那么接下来会调用 PyErr_Print。然后在 PyErr_Print 中，虚拟机取出维护的 traceback 链表，并进行遍历，将里面的信息逐个输出到 stderr 当中，最终就是我们在 Python 中看到的异常信息。 并且打印顺序是：.py文件、函数f、函数g、函数h。因为每一个栈帧对应一个 traceback，而栈帧又是往后退的，因此显然会从 .py文件对应的 traceback 开始打印，然后通过 tb_next 找到函数 f 对应的 traceback，依次下去。当异常信息全部输出完毕之后，解释器就结束运行了。 因此从链路的开始位置到结束位置，将整个调用过程都输出出来，可以很方便地定位问题出现在哪里。 另外，虽然 traceback 一直在更新（因为要对整个调用链路进行追踪），但是异常类型和异常值始终是不变的，就是函数 h 中抛出的 ZeroDivisionError: division by zero。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 栈帧展开","id":"292","title":"栈帧展开"},"293":{"body":"以上就是虚拟机抛异常的过程，异常在 Python 里面也是一个对象，和其它的实例对象并无本质区别。 exc = StopIteration(\"迭代结束了\")\nprint(exc.value) # 迭代结束了\nprint(exc.args) # ('迭代结束了',) exc = IndexError(\"索引越界了\")\nprint(exc.args) # ('索引越界了',) exc = Exception(\"不知道是啥异常，总之出问题了\")\nprint(exc.args) # ('不知道是啥异常，总之出问题了',) # 异常都有一个 args 属性，以元组的形式保存传递的参数 所谓抛出异常，就是将错误信息输出到 stderr 中，然后停止进程。并且除了虚拟机内部会抛出异常之外，我们还可以使用 raise 关键字手动引发一个异常。 def judge_score(score: int): if score > 100 or score < 0: raise ValueError(\"Score must be between 0 and 100\") 站在虚拟机的角度，score 取任何值都是合理的，但对于我们来说，希望 score 位于 0 ~ 100。那么当 score 不满足 0 ~ 100 时，就可以手动 raise 一个异常。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"63. 异常是怎么实现的？虚拟机是如何将异常抛出去的？ » 小结","id":"293","title":"小结"},"3":{"body":"本文就说到这里，赶快下载 Python 3.8 源码，来和我一起学习 Python 吧（ヾ(◍°∇°◍)ﾉﾞ）。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"1. CPython 源码长什么样子？ » 小结","id":"3","title":"小结"},"30":{"body":"lst = [] 和 lst = list() 都会创建一个空列表，但这两种方式有什么区别呢？ 我们说创建实例对象可以通过解释器提供的特定类型 API，用于内置类型；也可以通过实例化类型对象去创建，既可用于自定义类型，也可用于内置类型。 # 通过特定类型 API 创建\n>>> lst = [] >>> lst\n[]\n# 通过调用类型对象创建\n>>> lst = list() >>> lst\n[] 还是那句话，解释器对内置数据结构了如指掌，并且做足了优化。 看到 123，就知道创建 PyLongObject 实例； 看到 2.71，就知道创建 PyFloatObject 实例； 看到 ( )，就知道创建 PyTupleObject 实例； 看到 [ ]，就知道创建 PyListObject 实例； ······ 这些都会使用特定类型 API 去创建，直接为结构体申请内存，然后设置引用计数和类型，所以使用 [ ] 创建列表是最快的。但如果使用 list() 创建列表，那么就产生了一个调用，要进行参数解析、类型检测、创建栈帧、销毁栈帧等等，所以开销会大一些。 import time start = time.perf_counter()\nfor _ in range(10000000): lst = []\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.2144167000001289\n\"\"\" start = time.perf_counter()\nfor _ in range(10000000): lst = list()\nend = time.perf_counter()\nprint(end - start) \"\"\"\n0.4079916000000594\n\"\"\" 通过 [ ] 的方式创建一千万次空列表需要 0.21 秒，但通过 list() 的方式创建一千万次空列表需要 0.40 秒，主要就在于 list() 是一个调用，而 [ ] 会直接被解析成 PyListObject，因此 [ ] 的速度会更快一些。 所以对于内置类型的实例对象而言，使用特定类型 API 创建要更快一些。而且事实上通过类型对象去创建的话，会先调用 tp_new，然后在 tp_new 内部还是调用了特定类型 API。 比如： 创建列表：可以是 list()、也可以是 [ ]； 创建元组：可以是 tuple()、也可以是 ( )； 创建字典：可以是 dict()、也可以是 { }； 前者是通过类型对象创建的，后者是通过特定类型 API 创建的。对于内置类型的实例对象而言，我们推荐使用特定类型 API 创建，会直接解析为对应的 C 一级数据结构，因为这些结构在底层都是已经实现好了的，可以直接用。而无需通过诸如 list() 这种调用类型对象的方式来创建，因为它们内部最终还是使用了特定类型 API，相当于多绕了一圈。 不过以上都是针对内置类型，而自定义的类型就没有这个待遇了，它的实例对象只能通过调用它自己创建。比如 Person 这个类，解释器不可能事先定义一个 PyPersonObject 然后将 API 提供给我们，所以我们只能通过调用 Person 来创建它的实例对象。 另外内置类型被称为静态类，它和它的实例对象在底层已经定义好了，无法动态修改。我们自定义的类型被称为动态类，它是在解释器运行的过程中动态构建的，所以我们可以对其进行动态修改。 事实上 Python 的动态性、GIL 等特性，都是解释器在将字节码翻译成 C 代码时动态赋予的，而内置类型在编译之后已经是指向 C 一级的数据结构，因此也就丧失了相应的动态性。不过与之对应的就是效率上的提升，因为运行效率和动态性本身就是鱼与熊掌的关系。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » [] 和 list()，应该使用哪种方式","id":"30","title":"[] 和 list()，应该使用哪种方式"},"31":{"body":"以上我们就简单分析了 Python 对象的创建过程，当然这只是一个开头，其背后还隐藏了大量的细节，我们后续会慢慢说。 下一篇文章来聊一聊，对象是如何被调用的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"7. 当创建一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"31","title":"小结"},"32":{"body":"在上一篇文章中，我们分析了对象是如何创建的，主要有两种方式，一种是通过特定类型 API，另一种是通过调用类型对象。 对于内置类型的实例对象而言，这两种方式都是支持的，比如列表，我们既可以通过 [ ] 创建，也可以通过 list() 创建，前者是列表的特定类型 API，后者是调用类型对象。但对于自定义类的实例对象而言，我们只能通过调用类型对象的方式来创建。 而一个对象如果可以被调用，那么这个对象就是 callable，否则就不是 callable。那么问题来了，如果一个对象是 callable，那么它都具有哪些特征呢？ 从 Python 的角度看，如果对象是 callable，那么它的类型对象一定实现了 __call__ 函数； 从解释器的角度看，如果对象是 callable，那么它的类型对象的 tp_call 字段一定不为空。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 楔子","id":"32","title":"楔子"},"33":{"body":"调用 int 可以创建一个整数，调用 str 可以创建一个字符串，调用 tuple 可以创建一个元组，调用自定义的类也可以创建出相应的实例对象，这就说明类型对象是可调用的，也就是 callable。既然类型对象可调用，那么类型对象的类型对象（type）内部一定实现了 __call__ 函数。 # int 可以调用，那么它的类型对象、也就是元类（type）一定实现了 __call__ 函数\nprint(hasattr(type, \"__call__\")) # True # 而调用一个对象，等价于调用其类型对象的 __call__ 函数\n# 所以 int(2.71) 实际上就等价于如下\nprint(type.__call__(int, 2.71)) # 2 我们说 int、str、float 这些都是类型对象（简单来说就是类），而 123、\"你好\"、2.71 是其对应的实例对象，这些都没问题。但如果相对 type 而言，int、str、float 是不是又成了实例对象呢？因为它们的类型都是 type。 所以 class 具有二象性： 如果站在实例对象（如：123、\"你好\"、2.71）的角度上，它是类型对象； 如果站在 type 的角度上，它是实例对象； 同理，由于 type 的类型还是 type，那么 type 既是 type 的类型对象，type 也是 type 的实例对象。虽然这里描述的有一些绕，但应该不难理解，而为了避免后续的描述出现歧义，这里我们做一个申明： 整数、浮点数、字符串、列表等等，我们称之为实例对象 int、float、str、dict，以及自定义的类，我们称之为类型对象 type 虽然也是类型对象，但我们称它为元类 由于 type 的内部定义了 __call__ 函数，那么说明类型对象都是可调用的，因为调用类型对象就是调用元类 type 的 __call__ 函数。而实例对象能否调用就不一定了，这取决于它的类型对象是否定义了 __call__ 函数，因为调用一个对象，本质上是调用其类型对象内部的 __call__ 函数。 class A: pass a = A()\n# 因为自定义的类 A 里面没有 __call__\n# 所以 a 是不可以被调用的\ntry: a()\nexcept Exception as e: # 告诉我们 A 的实例对象无法被调用 print(e) # 'A' object is not callable # 如果我们给 A 设置了一个 __call__\ntype.__setattr__(A, \"__call__\", lambda self: \"这是__call__\")\n# 发现可以调用了\nprint(a()) # 这是__call__ 这就是动态语言的特性，即便在类创建完毕之后，依旧可以通过 type 进行动态设置，而这在静态语言中是不支持的。所以 type 是所有类的元类，它控制了自定义类的生成过程，因此 type 这个古老而又强大的类可以让我们玩出很多新花样。 但对于内置的类，type 是不可以对其动态增加、删除或者修改属性的，因为内置的类在底层是静态定义好的。从源码中我们看到，这些内置的类、包括元类，它们都是 PyTypeObject 对象，在底层已经被声明为全局变量了，或者说它们已经作为静态类存在了。所以 type 虽然是所有类型对象的类型，但只有面对自定义的动态类，type 才具有对属性进行增删改的能力。 而且在上一篇文章中我们也解释过，Python 的动态性是解释器将字节码翻译成 C 代码的时候赋予的，因此给类对象动态设置属性只适用于动态类，也就是在 py 文件中使用 class 关键字定义的类。而对于静态类，它们在编译之后已经是指向 C 一级的数据结构了，不需要再被解释器解释了，因此解释器自然也就无法在它们身上动手脚，毕竟彪悍的人生不需要解释。 try: type.__setattr__(dict, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'dict' \"\"\" try: type.__setattr__(list, \"ping\", \"pong\")\nexcept Exception as e: print(e) \"\"\" can't set attributes of built-in/extension type 'list' \"\"\" 同理其实例对象亦是如此，静态类的实例对象也不可以动态设置属性： lst = list()\ntry: lst.name = \"古明地觉\"\nexcept Exception as e: print(e) # 'list' object has no attribute 'name' 在介绍 PyTypeObject 结构体的时候我们说过，静态类的实例对象可以绑定哪些属性，已经写死在 tp_members 字段里面了。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从 Python 的角度看对象的调用","id":"33","title":"从 Python 的角度看对象的调用"},"34":{"body":"如果一个对象可以被调用，那么它的类型对象中一定要有 tp_call，更准确的说是 tp_call 字段的值是一个具体的函数指针，而不是 0。由于 PyList_Type 是可以调用的，这就说明 PyType_Type 内部的 tp_call 是一个函数指针，这在 Python 的层面我们已经验证过了，下面再来通过源码看一下。 在创建 PyType_Type 的时候，PyTypeObject 内部的 tp_call 字段被设置成了 type_call。所以当我们调用 PyList_Type 的时候，会执行 type_call 函数。 因此 list() 在 C 的层面上等价于： (&PyList_Type)->ob_type->tp_call(&PyList_Type, args, kwargs);\n// 即：\n(&PyType_Type)->tp_call(&PyList_Type, args, kwargs);\n// 而在创建 PyType_Type 的时候，给 tp_call 字段传递的是 type_call\n// 因此最终等价于\ntype_call(&PyList_Type, args, kwargs) 如果用 Python 来演示这一过程的话： # 以 list(\"abcd\") 为例，它等价于\nlst1 = list.__class__.__call__(list, \"abcd\")\n# 等价于\nlst2 = type.__call__(list, \"abcd\")\nprint(lst1) # ['a', 'b', 'c', 'd']\nprint(lst2) # ['a', 'b', 'c', 'd'] 这就是 list() 的秘密，相信其它类型在实例化的时候是怎么做的，你已经知道了，做法是相同的。 # dct = dict([(\"name\", \"古明地觉\"), (\"age\", 17)])\ndct = dict.__class__.__call__( dict, [(\"name\", \"古明地觉\"), (\"age\", 17)]\n)\nprint(dct) # {'name': '古明地觉', 'age': 17} # buf = bytes(\"hello world\", encoding=\"utf-8\")\nbuf = bytes.__class__.__call__( bytes, \"hello world\", encoding=\"utf-8\"\n)\nprint(buf) # b'hello world' 当然，目前还没有结束，我们还需要看一下 type_call 的源码实现。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 从解释器的角度看对象的调用","id":"34","title":"从解释器的角度看对象的调用"},"35":{"body":"调用类型对象，本质上会调用 type.__call__，在底层对应 type_call 函数，因为 PyType_Type 的 tp_call 字段被设置成了 type_call。当然调用 type 也是如此，因为 type 的类型还是 type。 那么这个 type_call 都做了哪些事情呢？ // Objects/typeobject.c static PyObject *\ntype_call(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 参数 type 表示类型对象或者元类，假设调用的是 list，那么它就是 &PyList_Type // 参数 args 和 kwds 表示位置参数和关键字参数，args 是元组，kwds 是字典 // 指向创建的实例对象，当然也可能是类型对象，取决于参数 type // 如果参数 type 表示元类，那么 obj 会指向类型对象，并且是自定义的动态类 // 如果参数 type 表示类型对象，那么 obj 会指向实例对象 PyObject *obj; // 执行类型对象（也可能是元类）的 tp_new，也就是 __new__ // 如果不存在，那么会报错，而在 Python 中见到的报错信息就是这里指定的 if (type->tp_new == NULL) { PyErr_Format(PyExc_TypeError, \"cannot create '%.100s' instances\", type->tp_name); return NULL; } obj = type->tp_new(type, args, kwds); // 检测调用是否正常，如果调用正常，那么 obj 一定指向一个合法的 PyObject // 而如果 obj 为 NULL，则表示执行出错，此时解释器会抛出异常 obj = _Py_CheckFunctionResult((PyObject*)type, obj, NULL); if (obj == NULL) return NULL; // 这里要做一个额外判断： // 如果参数 type 是 &PyType_Type，也就是 Python 中的元类 // 那么它可以接收一个位置参数（查看对象类型），也可以接收三个位置参数（创建自定义类） // 所以当 type 是 &PyType_Type，位置参数的个数为 1，并且没有传递关键字参数时 // 那么表示查看对象的类型，此时直接返回 obj 即可 if (type == &PyType_Type && PyTuple_Check(args) && PyTuple_GET_SIZE(args) == 1 && (kwds == NULL || (PyDict_Check(kwds) && PyDict_GET_SIZE(kwds) == 0))) return obj; // 到这里说明不是查看对象类型，而是创建类或者实例 // 如果参数 type 是元类，那么表示创建类，此时 args 的长度必须为 3 // 如果参数 type 是类型对象，那么表示创建实例对象 // 所以为了描述方便，我们就假设参数 type 是类型对象，但我们知道它也可以是元类 // 总之到这里 __new__ 已经执行完了，那么之后该干啥了？显然是执行 __init__，但需要先做一个检测 // 如果 __new__ 返回的实例对象的类型不是当前类型，那么直接返回，不再执行 __init__ // 比如自定义 class A，那么在 __new__ 里面应该返回 A 的实例对象，但我们故意返回个 123 // 由于返回值的类型不是当前类型，那么不再执行初始化函数 __init__ if (!PyType_IsSubtype(Py_TYPE(obj), type)) return obj; // 走到这里说明类型一致，那么执行 __init__，将 obj、args、kwds 一起传过去 type = Py_TYPE(obj); if (type->tp_init != NULL) { int res = type->tp_init(obj, args, kwds); if (res < 0) { assert(PyErr_Occurred()); Py_DECREF(obj); obj = NULL; } else { assert(!PyErr_Occurred()); } } // 返回创建的对象 obj，当然准确来说是对象的泛型指针 // 因为 Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针 // 只是有时为了描述方便，我们会说成是对象，这一点我们心里清楚就好 return obj;\n} 所以整个过程就三步： 如果传递的是元类，并且只有一个参数，那么直接返回对象的类型； 否则先调用 tp_new 为实例对象申请内存； 再调用 tp_init（如果有）进行初始化，设置对象属性； 所以这对应了 Python 中的 __new__ 和 __init__，其中 __new__ 负责为实例对象开辟一份内存，然后返回指向对象的指针，并且该指针会自动传递给 __init__ 中的 self。 class Girl: def __new__(cls, name, age): print(\"__new__ 方法执行啦\") # 调用 object.__new__(cls) 创建 Girl 的实例对象 # 然后该对象的指针会自动传递给 __init__ 中的 self return object.__new__(cls) def __init__(self, name, age): print(\"__init__ 方法执行啦\") self.name = name self.age = age g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n__new__ 方法执行啦\n__init__ 方法执行啦\n古明地觉 16\n\"\"\" __new__ 里面的参数要和 __init__ 里面的参数保持一致，因为会先执行 __new__ ，然后解释器再将 __new__ 的返回值和传递的参数组合起来一起传给 __init__。因此从这个角度上讲，设置属性完全可以在 __new__ 里面完成。 class Girl: def __new__(cls, name, age): self = object.__new__(cls) self.name = name self.age = age return self g = Girl(\"古明地觉\", 16)\nprint(g.name, g.age)\n\"\"\"\n古明地觉 16\n\"\"\" 这样也是没问题的，不过 __new__ 一般只负责创建实例，设置属性应该交给 __init__ 来做，毕竟一个是构造函数、一个是初始化函数，各司其职。另外由于 __new__ 里面不负责初始化，那么它的参数除了 cls 之外，一般都会写成 *args 和 **kwargs。 然后再回过头来看一下 type_call 中的这两行代码： tp_new 应该返回该类型对象的实例对象，而且一般情况下我们是不重写 __new__ 的，会默认执行 object 的 __new__。但如果我们重写了，那么必须要手动返回 object.__new__(cls)。可如果我们不返回，或者返回其它的话，会怎么样呢？ class Girl: def __new__(cls, *args, **kwargs): print(\"__new__ 方法执行啦\") instance = object.__new__(cls) # 打印看看 instance 到底是个啥 print(\"instance:\", instance) print(\"type(instance):\", type(instance)) # 正确做法是将 instance 返回 # 但是我们不返回，而是返回一个整数 123 return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\n\"\"\"\n__new__ 方法执行啦\ninstance: <__main__.Girl object at 0x0000019A2B7270A0>\ntype(instance): <class '__main__.Girl'>\n\"\"\" 这里面有很多可以说的点，首先就是 __init__ 里面需要两个参数，但是我们没有传，却还不报错。原因就在于这个 __init__ 压根就没有执行，因为 __new__ 返回的不是 Girl 的实例对象。 通过打印 instance，我们知道了 object.__new__(cls) 返回的就是 cls 的实例对象，而这里的 cls 就是 Girl 这个类本身。所以我们必须要返回 instance，才会自动执行相应的 __init__。 我们在外部来打印一下创建的实例对象吧，看看结果： class Girl: def __new__(cls, *args, **kwargs): return 123 def __init__(self, name, age): print(\"__init__ 方法执行啦\") g = Girl()\nprint(g)\n\"\"\"\n123\n\"\"\" 我们看到打印的结果是 123，所以再次总结一下 tp_new 和 tp_init 之间的区别，当然也对应 __new__ 和 __init__ 的区别： tp_new：为实例对象申请内存，底层会调用 tp_alloc，至于对象的大小则记录在 tp_basicsize 字段中，而在 Python 里面则是调用 object.__new__(cls)，然后一定要将实例对象返回； tp_init：tp_new 的返回值会自动传递给 self，然后为 self 绑定相应的属性，也就是进行实例对象的初始化； 但如果 tp_new 返回的对象的类型不对，比如 type_call 的第一个参数接收的是 &PyList_Type，但 tp_new 返回的却是 PyTupleObject *，那么此时就不会执行 tp_init。对应上面的 Python 代码就是，Girl 的 __new__ 应该返回 Girl 的实例对象（指针）才对，但却返回了整数，因此类型不一致，不会执行 __init__。 所以都说类在实例化的时候会先调用 __new__，再调用 __init__，相信你应该知道原因了，因为在源码中先调用 tp_new，再调用 tp_init。所以源码层面表现出来的，和我们在 Python 层面看到的是一样的。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » type_call 源码解析","id":"35","title":"type_call 源码解析"},"36":{"body":"到此，我们就从 Python 和解释器两个层面剖析了对象是如何调用的，更准确的说，我们是从解释器的角度对 Python 层面的知识进行了验证，通过 tp_new 和 tp_init 的关系，来了解 __new__ 和 __init__ 的关系。 当然对象调用还不止目前说的这么简单，更多的细节隐藏在了幕后。后续我们会循序渐进，一点点地揭开它的面纱，并且在这个过程中还会不断地学习到新的东西。比如说，实例对象在调用方法的时候会自动将实例本身作为参数传递给 self，那么它为什么会传递呢？解释器在背后又做了什么工作呢？这些在之后的文章中都会详细说明。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"8. 当调用一个 Python 对象时，背后都经历了哪些过程？ » 小结","id":"36","title":"小结"},"37":{"body":"之前我们提到了泛型 API，这类 API 的特点是可以处理任意类型的对象，举个例子。 // 返回对象的长度\nPyObject_Size\n// 返回对象的某个属性的值\nPyObject_GetAttr\n// 返回对象的哈希值\nPyObject_Hash\n// 将对象转成字符串后返回\nPyObject_Str 对应到 Python 代码中，就是下面这个样子。 # PyObject_Size\nprint(len(\"古明地觉\"))\nprint(len([1, 2, 3]))\n\"\"\"\n4\n3\n\"\"\" # PyObject_GetAttr\nprint(getattr(\"古明地觉\", \"lower\"))\nprint(getattr([1, 2, 3], \"append\"))\nprint(getattr({}, \"update\"))\n\"\"\"\n<built-in method lower of str object at 0x7f081aa7e920>\n<built-in method append of list object at 0x7f081adc1100>\n<built-in method update of dict object at 0x7f081aa8fd80>\n\"\"\" # PyObject_Hash\nprint(hash(\"古明地觉\"))\nprint(hash(2.71))\nprint(hash(123))\n\"\"\"\n8152506393378233203\n1637148536541722626\n123\n\"\"\" # PyObject_Str\nprint(str(\"古明地觉\"))\nprint(str(object()))\n\"\"\"\n古明地觉\n<object object at 0x7fdfa0209d10>\n\"\"\" 这些 API 能处理任意类型的对象，这究竟是怎么办到的？要想搞清楚这一点，还是要从 PyObject 入手。 我们知道对象在 C 看来就是一个结构体实例，并且结构体嵌套了 PyObject。 # 创建一个浮点数，让变量 var 指向它\nvar = 2.71\n# 创建一个列表，让变量 var 指向它\nvar = [1, 2, 3] 浮点数对应的结构体是 PyFloatObject，列表对应的结构体是 PyListObject，变量 var 是指向对象的指针。那么问题来了，凭啥一个变量可以指向不同类型的对象呢？或者说变量和容器里面为什么可以保存不同对象的指针呢？ 原因在前面的文章中解释的很详细了，因为对象的指针会统一转成 PyObject * 之后再交给变量保存，以创建列表为例。 当然创建浮点数也是同理，因此变量和容器里的元素本质上就是一个泛型指针 PyObject *。而对象的指针在交给变量保存的时候，也都会先转成 PyObject *，因为不管什么对象，它底层的结构体都嵌套了 PyObject。正是因为这个设计，变量才能指向任意的对象。 所以 Python 变量相当于一个便利贴，可以贴在任意对象上。 不过问题来了，由于对象的指针会统一转成 PyObject * 之后再交给变量保存，那么变量怎么知道自己指向的是哪种类型的对象呢？相信你肯定知道答案：通过 ob_type 字段。 对象对应的结构体可以有很多个字段，比如 PyListObject，但变量能看到的只有前两个字段。至于之后的字段是什么，则取决于对象的类型。 所以变量会先通过 ob_type 字段获取对象的类型，如果 ob_type 字段的值为 &PyList_Type，那么变量指向的就是 PyListObject。如果 ob_type 字段的值为 &PyFloat_Type，那么变量指向的就是 PyFloatObject，其它类型同理。当得到了对象的类型，那么再转成相应的指针即可，假设 ob_type 是 &PyList_Type，那么变量会再转成 PyListObject *，这样就可以操作列表的其它字段了。 所以我们再总结一下： 变量和容器里的元素只能保存相同的指针类型，而不同类型的对象，其底层的结构体是不同的。但这些结构体无一例外都嵌套了 PyObject，因此它们的指针会统一转成 PyObject * 之后再交给变量保存。 然后变量在操作对象时，会先通过 ob_type 判断对象的类型，假如是 &PyList_Type，那么会再转成 PyListObject *，其它类型同理。我们以获取列表元素为例： 相信你已经知道为什么泛型 API 可以处理任意类型的对象了，我们再以 PyObject_GetAttr 为例，它内部会调用类型对象的 tp_getattro。 // Objects/object.c // 等价于 getattr(v, name)\nPyObject *\nPyObject_GetAttr(PyObject *v, PyObject *name)\n{ // 获取对象 v 的类型对象 PyTypeObject *tp = Py_TYPE(v); // 属性名称必须是字符串 if (!PyUnicode_Check(name)) { PyErr_Format(PyExc_TypeError, \"attribute name must be string, not '%.200s'\", name->ob_type->tp_name); return NULL; } // 如果类型对象实现了 tp_getattro，那么进行调用 // 等价于 Python 中的 type(v).__getattr__(v, name) if (tp->tp_getattro != NULL) return (*tp->tp_getattro)(v, name); // 否则会退化为 tp_getattr，它要求属性名称必须是 C 字符串 // 不过 tp_getattr 已经废弃，应该使用 tp_getattro if (tp->tp_getattr != NULL) { const char *name_str = PyUnicode_AsUTF8(name); if (name_str == NULL) return NULL; return (*tp->tp_getattr)(v, (char *)name_str); } // 否则说明对象 v 没有该属性 PyErr_Format(PyExc_AttributeError, \"'%.50s' object has no attribute '%U'\", tp->tp_name, name); return NULL;\n} 函数先通过 ob_type 找到对象的类型，然后通过类型对象的 tp_getattro 调用对应的属性查找函数。所以对象的类型不同，PyObject_GetAttr 调用的属性查找函数也不同，而这就是泛型 API 能处理任意对象的秘密。 我们再以 Python 代码为例： class A: def __getattr__(self, item): return f\"class：A，item：{item}\" class B: def __getattr__(self, item): return f\"class：B，item：{item}\" a = A()\nb = B()\nprint(getattr(a, \"some_attr\"))\nprint(getattr(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\"\n# 以上等价于\nprint(type(a).__getattr__(a, \"some_attr\"))\nprint(type(b).__getattr__(b, \"some_attr\"))\n\"\"\"\nclass：A，item：some_attr\nclass：B，item：some_attr\n\"\"\" 在 Python 里的表现和源码是一致的，我们再举个 iter 的例子： data = [1, 2, 3]\nprint(iter(data))\nprint(type(data).__iter__(data))\n\"\"\"\n<list_iterator object at 0x7fb8200f29a0>\n<list_iterator object at 0x7fb8200f29a0>\n\"\"\" 如果一个对象支持创建迭代器，那么它的类型对象一定实现了 __iter__，通过 type(data) 可以获取到类型对象，然后再将 data 作为参数调用 __iter__ 即可。 所以通过 ob_type 字段，这些泛型 API 实现了类似多态的效果，一个函数，多种实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"9. 再探泛型 API，感受 Python 对象的设计哲学","id":"37","title":"9. 再探泛型 API，感受 Python 对象的设计哲学"},"38":{"body":"我们知道所有类型对象在底层都由结构体 PyTypeObject 实例化得到，但内部字段接收的值不同，得到的类型对象就不同。类型对象不同，那么实例对象的表现就不同，这也正是一种对象区别于另一种对象的关键所在。 比如 PyLong_Type 的 tp_iter 是空，那么整数就不是可迭代对象，而 PyList_Type 的 tp_iter 不是空，那么列表就是可迭代对象。再比如 PyLong_Type 和 PyFloat_Type，虽然内部都实现了 tp_hash，但它们是不同的类型，所以整数和浮点数的哈希值计算方式也不一样。 因此类型对象决定了实例对象的行为，比如能否调用、能否计算哈希值、能否迭代等等，这些都由类型对象决定。 PyTypeObject 里面定义了很多函数指针，比如 tp_call、tp_hash 等等，它们可能指向某个具体的函数，也可能为空。这些函数指针可以看做是类型对象所定义的操作，这些操作决定了其实例对象在运行时的行为。 class A: # tp_new def __new__(cls, *args, **kwargs): pass # tp_init def __init__(self): pass # tp_call def __call__(self): pass # tp_getattro def __getattr__(self, attr): pass # tp_setattro def __setattr__(self, key, value): pass ... ... 像 tp_call、tp_hash、tp_new 等字段会直接对应 Python 里的魔法函数，它们以双下划线开头、以双下划线结尾。但除了魔法函数之外，每种类型还可以有很多自定义的成员函数。 # 自定义 foo 和 bar\nclass A: def foo(self): pass def bar(self): pass # 当然内置类型也是如此\n# 像 str 定义了 join、split、upper 等\nprint(str.join)\nprint(str.split)\nprint(str.upper)\n# 像 list 定义了 append、extend，insert 等\nprint(list.append)\nprint(list.extend)\nprint(list.insert) 这些自定义的函数会一起保存在类型对象的 tp_methods 里面，负责让实例对象更具有表现力。另外需要补充的是，类型对象里面定义的是函数，也叫成员函数，但实例对象在获取之后会自动包装成方法。所以当提到魔法函数和魔法方法时，其实表达的是同一个意思，只不过一个是站在类的角度，一个是站在实例的角度。 所以实例对象能调用的方法都定义在类型对象里面，并且通过实例调用本质上就是一个语法糖，但用起来更加优雅。假设有一个类 A，实例对象为 a，那么 a.some() 底层会转成 A.some(a)，至于这背后的细节后续再聊。 但除了以上这些，PyTypeObject 还提供了三个字段。 每个字段分别指向一个结构体实例，结构体实例中有大量的字段，这些字段都是函数指针，指向了具体的函数。所以它们也被称为方法簇，分别应用于如下操作。 tp_as_number：负责数值型操作，比如整数、浮点数的加减乘除； tp_as_sequence：负责序列型操作，比如字符串、列表、元组等通过索引取值的行为； tp_as_mapping：负责映射型操作，比如字典通过 key 映射出 value； 我们以 tp_as_number 为例，它指向 PyNumberMethods 类型的结构体实例，那么这个结构体长什么样子呢？ // Include/cpython/object.h typedef struct { // __add__，对应 + 操作符，如 a + b binaryfunc nb_add; // __sub__，对应 - 操作符，如 a - b binaryfunc nb_subtract; // __mul__，对应 * 操作符，如 a * b binaryfunc nb_multiply; // __mod__，对应 % 操作符，如 a % b binaryfunc nb_remainder; // __divmod__，对应 divmode 函数，如 divmod(a, b) binaryfunc nb_divmod; // __power__，对应 ** 操作符，如 a ** b ternaryfunc nb_power; // __neg__，对应 - 操作符，如 -a unaryfunc nb_negative; // __pos__，对应 + 操作符，如 +a unaryfunc nb_positive; // __abs__，对应 abs 函数，如 abs(a) unaryfunc nb_absolute; // __bool__，如 bool(a) inquiry nb_bool; // __invert__，对应 ~ 操作符，如 ~a unaryfunc nb_invert; // __lshift__，对应 << 操作符，如 a << b binaryfunc nb_lshift; // __rshift__，对应 >> 操作符，如 a >> b binaryfunc nb_rshift; // __and__，对应 & 操作符，如 a & b binaryfunc nb_and; // __xor__，对应 ^ 操作符，如 a ^ b binaryfunc nb_xor; // __or__，对应 | 操作符，如 a | b binaryfunc nb_or; // __int__，如 int(a) unaryfunc nb_int; // ...\n} PyNumberMethods; 你看到了什么？是不是想到了 Python 里面的魔法方法，所以它们也被称为方法簇。 在 PyNumberMethods 这个方法簇里面定义了作为一个数值对象应该支持的操作，同理，在 PySequenceMethods 和 PyMappingMethods 中分别定义了作为一个序列对象和映射对象应该支持的操作，这两种对象的典型例子就是 list 和 dict。 所以，只要类型对象提供相关操作，实例对象便具备对应的行为，因为实例对象所调用的方法都是由类型对象提供的。 class Girl: def __init__(self, name, age): self.name = name self.age = age def say(self): pass def cry(self): pass g = Girl(\"古明地觉\", 16)\nprint(g.__dict__) # {'name': '古明地觉', 'age': 16}\nprint(\"say\" in Girl.__dict__) # True\nprint(\"cry\" in Girl.__dict__) # True 实例对象的属性字典，只包含了一些在 __init__ 里面设置的属性而已，而实例能够调用的 say、cry 都是定义在类型对象中的。 因此一定要记住：类型对象定义的操作，决定了实例对象的行为。 class Int(int): def __getitem__(self, item): return item a = Int(1)\nb = Int(2) print(a + b) # 3\nprint(a[\"你好\"]) # 你好 继承了 int 的自定义类 Int 在实例化之后自然是一个数值对象，但 a[\"\"] 却是一个类似于字典才具有的行为，那为什么可以实现呢？原因就是我们重写了 __getitem__ 这个魔法函数，它在底层对应 PyMappingMethods 中的 mp_subscript 操作，因此最终 Int 实例对象表现的像一个字典一样。 归根结底就在于这几个方法簇都只是 PyTypeObject 的一个字段罢了，默认使用 PyTypeObject 结构体创建的 PyLong_Type 所生成的实例对象（整数）是不具备列表和字典的属性特征的。但我们通过继承 PyLong_Type，同时指定 __getitem__，使得构建出来的类型对象所生成的实例对象，同时具备多种属性特征，就是因为解释器支持这种做法。 自定义的类在底层也是 PyTypeObject 结构体实例，而在继承 int 的时候，将其内部定义的 PyNumberMethods 方法簇也继承了下来，而我们又单独实现了 PyMappingMethods 中的 mp_subscript。所以自定义类 Int 的实例对象具备了整数的全部行为，以及字典的部分行为（因为我们只实现了 __getitem__）。 下面再通过 PyLong_Type 实际考察一下： 整数对象支持数值操作，所以在创建 PyLong_Type 时，实现了 tp_as_number。但整数显然不支持序列和映射操作，因此字段 tp_as_sequence 和 tp_as_mapping 就是 0，相当于空。 而 tp_as_number 字段被赋值为 long_as_number，看一下它长什么样。 里面的 long_add、long_sub、long_mul 等等显然都是已经定义好的函数指针，在创建 PyNumberMethods 结构体实例 long_as_number 的时候，这些函数指针分别赋值给了字段 nb_add、nb_substract、nb_multiply 等等。然后创建完 long_as_number 之后，再将其指针交给 PyLong_Type 的 tp_as_number 字段。 因此整数在操作的时候，比如相加，会先通过 变量->ob_type->tp_as_number->nb_add 获取该操作对应的函数指针，其中 int 类型对象的 tp_as_number 字段的值是 &long_as_number，因此获取其字段 nb_add 的时候，拿到的就是 long_add 函数指针，然后调用。 同理 float 类型里的 tp_as_number 字段则被赋值成了 &float_as_number，获取 nb_add 字段的时候，拿到的就是 float_add 函数指针。不同类型的对象的行为不同，它们都有属于自己的一组方法簇。 最后再画一张图总结一下，假设有两个变量，分别是 e = 2.71 和 num = 666。 所以对象的行为是由其类型对象定义的操作所决定的，比如一个对象可以计算长度，那么它的类型对象要实现 __len__；一个对象可以转成整数，那么它的类型对象要实现 __int__ 或 __index__。 class A: def __len__(self): return 123 def __int__(self): return 456 a = A()\nprint(len(a)) # 123\nprint(int(a)) # 456\n# len(a) 在底层会执行 A.__len__(a)\n# int(a) 在底层会执行 A.__int__(a)\nprint(A.__len__(a)) # 123\nprint(A.__int__(a)) # 456 总之核心就是一句话：类型对象定义了哪些操作，决定了实例对象具有哪些行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"10. Python 对象的行为是怎么区分的？","id":"38","title":"10. Python 对象的行为是怎么区分的？"},"39":{"body":"如果对编程语言进行分类的话，一般可以分为静态语言和动态语言，也可以分为编译型语言和解释型语言。但个人觉得还有一种划分标准，就是是否自带垃圾回收。关于有没有垃圾回收，陈儒老师在《Python 2.5源码剖析》中，总结得非常好。 对于像 C 和 C++ 这类语言，程序员被赋予了极大的自由，可以任意地申请内存。但权力的另一面对应着责任，程序员最后不使用的时候，必须负责将申请的内存释放掉，并把无效指针设置为空。可以说，这一点是万恶之源，大量内存泄漏、悬空指针、越界访问的 bug 由此产生。 而现代的开发语言（比如 C#、Java）都带有垃圾回收机制，将开发人员从维护内存分配和清理的繁重工作中解放出来，开发者不用再担心内存泄漏的问题，但同时也被剥夺了和内存亲密接触的机会，并牺牲了一定的程序运行效率。不过好处就是提高了开发效率，并降低了 bug 发生的概率。 由于现在的垃圾回收机制已经非常成熟了，把对性能的影响降到了最低，因此大部分场景选择的都是带垃圾回收的语言。 而 Python 里面同样具有垃圾回收，只不过它是为引用计数机制服务的。所以解释器通过引用计数和垃圾回收，代替程序员进行繁重的内存管理工作，关于垃圾回收我们后面会详细说，先来看一下引用计数。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 楔子","id":"39","title":"楔子"},"4":{"body":"在学习 Python 的时候，你肯定听过这么一句话：Python 中一切皆对象。没错，在 Python 世界里，一切都是对象。整数是一个对象、字符串是一个对象、字典是一个对象，甚至 int, str, list 以及我们使用 class 关键字自定义的类，它们也是对象。 像 int, str, list 等基本类型，以及自定义的类，由于它们可以表示类型，因此我们称之为类型对象；类型对象实例化得到的对象，我们称之为实例对象。但不管是哪种对象，它们都属于对象。因此 Python 将面向对象理念贯彻的非常彻底，面向对象中的类和对象在 Python 中都是通过对象实现的。 在面向对象理论中，存在着类和对象两个概念，像 int、dict、tuple、以及使用 class 关键字自定义的类型对象实现了面向对象理论中类的概念，而 123、3.14、\"string\" 等实例对象则实现了面向对象理论中对象的概念。但在 Python 里面，面向对象中的类和对象都是通过对象实现的。 我们举个例子： # dict 是一个类，因此它属于类型对象\n# 类型对象实例化得到的对象属于实例对象\nprint(dict)\n\"\"\"\n<class 'dict'>\n\"\"\"\nprint(dict(a=1, b=2))\n\"\"\"\n{'a': 1, 'b': 2}\n\"\"\" 因此可以用一张图来描述面向对象在 Python 中的体现。 而如果想查看一个对象的类型，可以使用 type，或者通过对象的 __class__ 属性。 data = [1, 2, 3]\n# 查看类型\nprint(type(data))\n\"\"\"\n<class 'list'>\n\"\"\"\nprint(data.__class__)\n\"\"\"\n<class 'list'>\n\"\"\" 如果想判断一个对象是不是指定类型的实例对象，可以使用 isinstance。 data = [1, 2, 3]\n# 判断是不是指定类型的实例对象\nprint(isinstance(data, list))\n\"\"\"\nTrue\n\"\"\" 但是问题来了，按照面向对象的理论来说，对象是由类实例化得到的，这在 Python 中也是适用的。既然是对象，那么就必定有一个类来实例化它，换句话说对象一定要有类型。至于一个对象的类型是什么，就看这个对象是被谁实例化的，被谁实例化，那么类型就是谁，比如列表的类型是 list，字典的类型是 dict 等等。 而 Python 中一切皆对象，所以像 int, str, tuple 这些内置的类对象也是具有相应的类型的，那么它们的类型又是谁呢？使用 type 查看一下就知道了。 print(type(int)) # <class 'type'>\nprint(type(str)) # <class 'type'>\nprint(type(dict)) # <class 'type'>\nprint(type(type)) # <class 'type'> 我们看到类型对象的类型，无一例外都是 type。而 type 我们也称其为元类，表示类型对象的类型。至于 type 本身，它的类型还是 type，所以它连自己都没放过，把自己都变成自己的对象了。 因此在 Python 中，你能看到的任何对象都是有类型的，可以使用 type 查看，也可以获取该对象的 __class__ 属性查看。所以：实例对象、类型对象、元类，Python 中任何一个对象都逃不过这三种身份。 到这里可能有人会发现一个有意思的点，我们说 int 是一个类对象，这显然是没有问题的。因为站在整数（比如 123）的角度上，int 是一个不折不扣的类对象；但如果站在 type 的角度上呢？显然我们又可以将 int 理解为实例对象，因此 class 具有二象性。 至于 type 也是同理，虽然它是元类，但本质上也是一个类对象。 注：不仅 type 是元类，那些继承了 type 的类也可以叫做元类。 然后 Python 中还有一个关键的类型（对象），叫做 object，它是所有类型对象的基类。不管是什么类，内置的类也好，我们自定义的类也罢，它们都继承自 object。因此 object 是所有类型对象的基类、或者说父类。 那如果我们想获取一个类都继承了哪些基类，该怎么做呢？方式有三种： class A: pass class B: pass class C(A): pass class D(B, C): pass # 首先 D 继承自 B 和 C, C 又继承 A\n# 我们现在要来查看 D 继承的父类 # 方法一: 使用 __base__\nprint(D.__base__) \"\"\"\n<class '__main__.B'>\n\"\"\" # 方法二: 使用 __bases__\nprint(D.__bases__) \"\"\"\n(<class '__main__.B'>, <class '__main__.C'>)\n\"\"\" # 方法三: 使用 __mro__\nprint(D.__mro__)\n\"\"\"\n(<class '__main__.D'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.A'>, <class 'object'>)\n\"\"\" __base__：如果继承了多个类，那么只显示继承的第一个类，没有显式继承则返回 <class 'object'> __bases__：返回一个元组，会显示所有直接继承的父类，没有显式继承则返回 (<class 'object'>,) __mro__: mro（Method Resolution Order）表示方法查找顺序，会从自身出发，找到最顶层的父类。因此返回自身、继承的基类、以及基类继承的基类，一直找到 object 而如果想查看某个类型是不是另一个类型的子类，可以通过 issubclass。 print(issubclass(str, object))\n\"\"\"\nTrue\n\"\"\" 因此，我们可以得出以下两个结论： type 站在类型金字塔的最顶端，任何一个对象按照类型追根溯源，最终得到的都是 type； object 站在继承金字塔的最顶端，任何一个类型对象按照继承关系追根溯源，最终得到的都是 object； 但要注意的是，我们说 type 的类型还是 type，但 object 的基类则不再是 object，而是 None。 print(type.__class__) # <class 'type'> # 注：以下打印结果容易让人产生误解\n# 它表达的含义是 object 的基类为空\n# 而不是说 object 继承 None\nprint(object.__base__) # None 但为什么 object 的基类是 None，而不是它自身呢？其实答案很简单，Python 在查找属性或方法的时候，自身如果没有的话，会按照 __mro__ 指定的顺序去基类中查找。所以继承链一定会有一个终点，否则就会像没有出口的递归一样出现死循环了。 我们用一张图将对象之间的关系总结一下： 实例对象的类型是类型对象，类型对象的类型是元类； 所有类型对象的基类都收敛于 object； 所有对象的类型都收敛于 type； 因此 Python 算是将 一切皆对象 的理念贯彻到了极致，也正因为如此，Python 才具有如此优秀的动态特性。 但是还没结束，我们再重新审视一下上面那张图，会发现里面有两个箭头看起来非常的奇怪。object 的类型是 type，type 又继承了 object。 print(type.__base__) # <class 'object'>\nprint(object.__class__) # <class 'type'> 因为 type 是所有类的元类，而 object 是所有类的基类，这就说明 type 要继承自 object，而 object 的类型是 type。很多人都会对这一点感到奇怪，这难道不是一个先有鸡还是先有蛋的问题吗？答案不是的，这两个对象是共存的，它们之间的定义是互相依赖的。而具体是怎么一回事，我们后续分析。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » Python 中一切皆对象","id":"4","title":"Python 中一切皆对象"},"40":{"body":"Python 一切皆对象，所有对象都有一个 ob_refcnt 字段，该字段维护着对象的引用计数，从而也决定对象的存在与消亡。下面来探讨一下引用计数，当然引用计数在介绍 PyObject 的时候说的很详细了，这里再回顾一下。 但需要说明的是，比起类型对象，我们更关注实例对象的行为。引用计数也是如此，只有实例对象，我们探讨引用计数才是有意义的。因为内置的类型对象超越了引用计数规则，永远都不会被析构，或者销毁，因为它们在底层是被静态定义好的。同理，自定义的类虽然可以被回收，但是探讨它的引用计数也是没有价值的。我们举个栗子： class A: pass del A 首先 del 关键字只能作用于变量，不可以作用于对象。比如 e = 2.71，可以 del e，但是不可以 del 2.71，这是不符合语法规则的。因为 del 的作用是删除变量，并将其指向的对象的引用计数减 1，所以我们只能 del 变量，不可以 del 对象。 至于 def、class 语句执行完之后拿到的也是变量，前面说了，Python 虽然一切皆对象，但我们拿到的都是对象的泛型指针。比如上面代码中的 class A，它会先创建一个类对象，然后再让变量 A 指向这个类对象。所以我们拿到的 A 也是一个变量，只要是变量，就可以被 del。但是 del 变量只是删除了该变量，换言之就是让该变量无法再被使用，至于变量指向的对象是否会被回收，就看是否还有其它的变量也指向它。 总结：对象是否会被回收，完全由解释器判断它的引用计数是否为 0 所决定。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数","id":"40","title":"引用计数"},"41":{"body":"操作引用计数无非就是将其加一或减一，至于什么时候加一、什么时候减一，在介绍 PyObject 的时候已经说的很详细了。这里我们通过源码，看看引用计数具体是怎么操作的。 在底层，解释器会通过 Py_INCREF 和 Py_DECREF 两个宏来增加和减少对象的引用计数，而当对象的引用计数为 0 时，会调用对应的析构函数来销毁该对象，这个析构函数由对象的类型对象内部的 tp_dealloc 字段决定。 下面我们来看看底层实现，不过在介绍 Py_INCREF 和 Py_DECREF 之前，先来看几个其它的宏，这些宏非常常见，有必要单独说一下。 // Include/object.h // 将对象的指针转成 PyObject *\n#define _PyObject_CAST(op) ((PyObject*)(op))\n// 将对象的指针转成 PyVarObject *\n#define _PyVarObject_CAST(op) ((PyVarObject*)(op)) // 返回对象的引用计数，即对象的 ob_refcnt 字段\n#define Py_REFCNT(ob) (_PyObject_CAST(ob)->ob_refcnt)\n// 返回对象的类型，即对象的 ob_type 字段\n#define Py_TYPE(ob) (_PyObject_CAST(ob)->ob_type)\n// 返回对象的长度，即对象的 ob_size 字段\n#define Py_SIZE(ob) (_PyVarObject_CAST(ob)->ob_size) 然后再来看看 Py_INCREF 和 Py_DECREF，它们负责对引用计数执行加一和减一操作。 // Include/object.h // 将对象的 ob_refcnt 加 1\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op))\nstatic inline void _Py_INCREF(PyObject *op)\n{ _Py_INC_REFTOTAL; op->ob_refcnt++;\n} // 将对象的 ob_refcnt 减 1\n#define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))\ntatic inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ (void)filename; /* may be unused, shut up -Wunused-parameter */ (void)lineno; /* may be unused, shut up -Wunused-parameter */ _Py_DEC_REFTOTAL; // 将引用计数减 1 之后进行判断，如果结果不等于 0，则什么也不做 if (--op->ob_refcnt != 0) { // 正常情况下，Py_REF_DEBUG 宏不会被定义，因为引用计数不可能小于 0\n#ifdef Py_REF_DEBUG if (op->ob_refcnt < 0) { _Py_NegativeRefcount(filename, lineno, op); }\n#endif } // 否则说明引用计数为 0，意味着对象已经不被任何变量引用了，那么应该被销毁 else { // 调用 _Py_Dealloc 将对象销毁，这个 _Py_Dealloc 函数内部的逻辑很简单 // 虽然里面存在宏判断，但如果只看编译后的最终结果，那么代码就只有下面两行 /* destructor dealloc = Py_TYPE(op)->tp_dealloc; * (*dealloc)(op); */ // 会获取类型对象的 tp_dealloc，然后调用，销毁实例对象 _Py_Dealloc(op); }\n} 以上就是 Py_INCREF 和 Py_DECREF 两个宏的具体实现，但是它们不能接收空指针，如果希望能接收空指针，那么可以使用另外两个宏。 // Include/object.h #define Py_XINCREF(op) _Py_XINCREF(_PyObject_CAST(op))\nstatic inline void _Py_XINCREF(PyObject *op)\n{ if (op != NULL) { Py_INCREF(op); }\n} #define Py_XDECREF(op) _Py_XDECREF(_PyObject_CAST(op))\nstatic inline void _Py_XDECREF(PyObject *op)\n{ if (op != NULL) { Py_DECREF(op); }\n} 所以 Py_XINCREF 和 Py_XDECREF 会额外对指针做一次判断，如果为空则什么也不做，不为空再调用 Py_INCREF 和 Py_DECREF。而当一个对象的引用计数为 0 时，与该对象对应的析构函数就会被调用。 但要特别注意的是，我们上面说调用析构函数之后会回收对象，或者说销毁对象，意思是将这个对象从内存中抹去，但并不意味着要释放空间，也就是对象没了，但对象占用的内存却还在。 如果对象没了，占用的内存也要释放的话，那么频繁申请、释放内存空间会使 Python 的执行效率大打折扣，更何况 Python 已经背负了人们对其执行效率的不满这么多年。 所以 Python 底层大量采用了缓存池的技术，使用这种技术可以避免频繁地申请和释放内存空间。因此在析构的时候，只是将对象占用的空间放到缓存池中，并没有真的释放。 这一点，在后面剖析内置实例对象的实现中，将会看得一清二楚，因为大部分内置的实例对象都会有自己的缓存池。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 引用计数的相关操作","id":"41","title":"引用计数的相关操作"},"42":{"body":"到此我们就把这些基础概念说完了，后续你会发现目前花费的这些笔墨都是值得的，总之先对 Python 有一个宏观的认识，然后再学习具体的数据结构就简单多了。 所以从下一篇文章开始就要详细剖析内置对象的底层实现了，比如浮点数、复数、整数、布尔值、None、bytes 对象、bytearray 对象、字符串、元组、列表、字典、集合等等，所有的内置对象都会详细地剖析一遍，看看它是如何实现的。 有了目前为止的这些基础，我们后面就会轻松很多。先把对象、变量等概念梳理清楚，然后再来搞这些数据结构的底层实现。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"11. 一个 Python 对象会在何时被销毁？ » 小结","id":"42","title":"小结"},"43":{"body":"从现在开始，我们就来分析 Python 的内置对象，看看它们在底层是如何实现的。但说实话，我们在前面几篇文章中介绍对象的时候，已经说了不少了，不过从现在开始要进行更深入的分析。 除了对象本身，还要看对象支持的操作在底层是如何实现的。我们首先以浮点数为例，因为它是最简单的，没错，浮点数比整数要简单，至于为什么，等我们分析整数的时候就知道了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 楔子","id":"43","title":"楔子"},"44":{"body":"要想搞懂浮点数的实现原理，就要知道它在底层是怎么定义的，当然在这之前我们已经见过它很多遍了。 // Include/floatobject.h\ntypedef struct { PyObject_HEAD double ob_fval;\n} PyFloatObject; 它包含了一个公共头部 PyObject 和一个 double 类型的 ob_fval 字段，毫无疑问这个 ob_fval 字段负责存储浮点数的具体数值。 我们以 e = 2.71 为例，底层结构如下。 还是很简单的，每个对象在底层都是由结构体表示的，这些结构体中有的字段负责维护对象的元信息，有的字段负责维护具体的值。比如这里的 2.71，总要有一个字段来存储 2.71 这个值，而这个字段就是 ob_fval。所以浮点数的结构非常简单，直接使用一个 C 的 double 来维护。 假设我们要将两个浮点数相加，相信你已经知道解释器会如何做了。通过 PyFloat_AsDouble 将两个浮点数的 ob_fval 抽出来，然后相加，最后再根据相加的结果创建一个新的 PyFloatObject 即可。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数的底层结构","id":"44","title":"浮点数的底层结构"},"45":{"body":"下面来看看浮点数是如何创建的，在前面的文章中，我们说内置对象可以使用对应的特定类型 API 创建，也可以通过调用类型对象创建。 调用类型对象 float 创建实例对象，解释器会执行元类 type 的 tp_call，它指向了 type_call 函数。然后 type_call 内部会先调用类型对象（这里是 float）的 tp_new 为其实例对象申请一份空间，申请完毕之后对象就创建好了。然后再调用 tp_init，并将实例对象作为参数传递进去，进行初始化，也就是设置属性。 但是对于 float 来说，它内部的 tp_init 字段为 0，也就是空。 这就说明 float 没有 __init__，因为浮点数太过简单，只需要一个 tp_new 即可。我们举个例子： class Girl1: def __init__(self, name, age): self.name = name self.age = age # __new__ 负责开辟空间、生成实例对象\n# __init__ 负责给实例对象绑定属性 # 但其实 __init__ 所做的工作可以直接在 __new__ 当中完成\n# 换言之有 __new__ 就足够了，其实可以没有__init__\n# 我们将上面的例子改写一下 class Girl2: def __new__(cls, name, age): instance = object.__new__(cls) instance.name = name instance.age = age return instance g1 = Girl1(\"古明地觉\", 16)\ng2 = Girl2(\"古明地觉\", 16)\nprint(g1.__dict__ == g2.__dict__) # True 我们看到效果是等价的，因为 __init__ 负责给 self 绑定属性，而这个 self 是 __new__ 返回的。那么很明显，我们也可以在 __new__ 当中绑定属性，而不需要 __init__。 但是按照规范，属性绑定应该放在 __init__ 中执行。只是对于浮点数而言，由于其结构非常简单，所以底层就没有给 float 实现 __init___，所有操作都是在 __new__ 当中完成的。 print(float.__init__ is object.__init__) # True\nprint(tuple.__init__ is object.__init__) # True\nprint(list.__init__ is object.__init__) # False 所以 float 没有 __init__，即便获取拿到的也是 object 的 __init__，因为 object 是 float 的基类。同理 tuple 也没有，但 list 是有的。 那么下面就来看一下 PyFloat_Type 的 tp_new，看它是如何创建浮点数的。通过 PyFloat_Type 的定义我们可以看到，在创建的时候给 tp_new 字段设置的是 float_new，那么一切秘密就隐藏在 float_new 里面。 // Objects/clinic/floatobject.c.h\nstatic PyObject *\nfloat_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)\n{ PyObject *return_value = NULL; PyObject *x = _PyLong_Zero; // float 不接收关键字参数，如果传递了，那么报错 if ((type == &PyFloat_Type) && !_PyArg_NoKeywords(\"float\", kwargs)) { goto exit; } // float 只接收 0 到 1 个位置参数，如果不满足，那么报错 if (!_PyArg_CheckPositional(\"float\", PyTuple_GET_SIZE(args), 0, 1)) { goto exit; } // 如果参数个数为 0，说明调用 float 时没传参数，那么直接跳转到 skip_optional 标签 // 由于变量 x 的值初始为 _PyLong_Zero，所以在 Python 中，float() 和 float(0) 是等价的 if (PyTuple_GET_SIZE(args) < 1) { goto skip_optional; } // 否则说明传递了一个参数，那么获取该参数 x = PyTuple_GET_ITEM(args, 0);\nskip_optional: // 调用 float_new_impl，拿到返回值 // 所以核心实现位于 float_new_impl 函数中 return_value = float_new_impl(type, x); exit: return return_value;\n} // Objects/floatobject.c\nstatic PyObject *\nfloat_new_impl(PyTypeObject *type, PyObject *x)\n{ // 如果 type 不是 &PyFloat_Type，那么必须是它的子类，否则调用 float_subtype_new 会报错 // 但该条件很少触发，因为创建的是浮点数，所以 type 自然是 &PyFloat_Type if (type != &PyFloat_Type) return float_subtype_new(type, x); // 然后检测 x 的类型，如果它是一个字符串，那么就根据字符串创建浮点数，比如 float(\"3.14\") if (PyUnicode_CheckExact(x)) return PyFloat_FromString(x); // 不是字符串，则调用 PyNumber_Float return PyNumber_Float(x);\n} 再来看看 PyNumber_Float。 // Objects/abstract.c\nPyObject *\nPyNumber_Float(PyObject *o)\n{ PyNumberMethods *m; // 如果传递的是 NULL，直接返回错误 if (o == NULL) { return null_error(); } // 如果传递的本身就是个浮点数，那么增加引用计数，直接返回 if (PyFloat_CheckExact(o)) { Py_INCREF(o); return o; } // 走到这里说明对象不是浮点数，那么它必须要能转成浮点数 // 也就是类型对象的内部要有 __float__ 这个魔法函数，即 nb_float // 获取方法簇 m = o->ob_type->tp_as_number; // 如果方法簇不为空，并且也实现了 nb_float if (m && m->nb_float) { // 那么获取 nb_float 指向的函数并调用，将对像转成浮点数 PyObject *res = m->nb_float(o); double val; // 如果 res 不为 NULL，并且是浮点数，那么返回 // PyFloat_CheckExact 负责检测一个对象的类型是否是 <class 'float'> // 其逻辑等价于 type(res) is float if (!res || PyFloat_CheckExact(res)) { return res; } // 走到这里说明 __float__ 返回的对象不是浮点数，即对象的类型不是 float // 如果不是 float，那么 float 的子类目前也是可以的（会抛警告） // PyFloat_Check 负责检测对象的类型是否是 float 或者其子类 // 其逻辑等价于 isinstance(res, float) if (!PyFloat_Check(res)) { // 如果返回的对象的类型不是 float 或者其子类，那么报错 PyErr_Format(PyExc_TypeError, \"%.50s.__float__ returned non-float (type %.50s)\", o->ob_type->tp_name, res->ob_type->tp_name); Py_DECREF(res); return NULL; } // 到这里说明返回的对象的类型是 float 的子类，此时也是合法的，但会抛出警告 if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1, \"%.50s.__float__ returned non-float (type %.50s). \" \"The ability to return an instance of a strict subclass of float \" \"is deprecated, and may be removed in a future version of Python.\", o->ob_type->tp_name, res->ob_type->tp_name)) { Py_DECREF(res); return NULL; } // res 虽然是 float 子类的实例对象，但依旧具备浮点数的特征，因此将内部的数值抽出来 val = PyFloat_AS_DOUBLE(res); // 减少 res 指向对象的引用计数 Py_DECREF(res); // 创建 PyFloatObject 实例，并返回它的泛型指针 // 因此即使 __float__ 返回的是 float 子类的实例对象，也会默认转成 float 对象（浮点数）返回 return PyFloat_FromDouble(val); } // 如果 float 接收的参数没有实现 nb_float（__float__），那么会去找 nb_index（__index__） if (m && m->nb_index) { // 内部会调用对象的 nb_index PyObject *res = PyNumber_Index(o); if (!res) { return NULL; } // __index__ 返回的必须是整数 // 所以调用的是 PyLong_AsDouble，表示基于 Python 整数创建 C 浮点数 double val = PyLong_AsDouble(res); Py_DECREF(res); if (val == -1.0 && PyErr_Occurred()) { return NULL; } // 通过 C 浮点数创建 Python 浮点数 return PyFloat_FromDouble(val); } // 到这里说明对象没有实现 __float__ 和 __index__ // 那么检测传递的对象的类型是不是 float 的子类 // 如果是，证明它的结构和浮点数是一致的 // 直接根据 ob_fval 构建 PyFloatObject if (PyFloat_Check(o)) { return PyFloat_FromDouble(PyFloat_AS_DOUBLE(o)); } // 如果以上条件都不满足，说明它有可能是字节串、字节数组、字符串（但类型是 str 的子类）等等 // 那么直接交给 PyFloat_FromString return PyFloat_FromString(o);\n} 所以一个 float 调用居然要走这么多逻辑，总之解释器为我们考虑了很多。我们用 Python 来演绎一下： # 2.71 是一个字符串，所以在 float_new_impl 里面直接调用 PyFloat_FromString\nprint(float(\"2.71\")) # 2.71 class E: def __float__(self): return 2.71 # 传递的参数是一个 E 类型，所以会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_float，所以会直接调用\nprint(float(E())) # 2.71 class N: def __index__(self): return 3 # N 不是字符串类型，显然也会进入 PyNumber_Float 函数\n# 由于对象实现了 nb_index，所以会直接调用\nprint(float(N())) # 3.0 class PI: class Float(float): pass def __float__(self): return self.Float(3.14) # 显然会调用内部的 __float__，但 __float__ 返回的不是 float 实例，而是 float 子类的实例\n# 虽然这种做法是允许的，但会抛出警告，警告的内容就是源码中描述的那样\n# DeprecationWarning: PI.__float__ returned non-float (type Float).\nprint(float(PI())) # 3.14 # 参数不是字符串，也没有实现 __float__ 和 __index__，那么直接执行 PyFloat_FromString\nprint(float(b\"1.414\")) # 1.414 以上是通过类型对象创建，但在底层实际上也是调用了对象的特定类型 APl。 PyObject *\nPyFloat_FromDouble(double); PyObject *\nPyFloat_FromString(PyObject *); PyFloat_FromDouble：基于 C 浮点数创建 Python 浮点数； PyFloat_FromString：基于字符串创建 Python 浮点数； 如果以 e = 2.71 这种方式创建，那么解释器在编译的时候就知道这是一个浮点数，因此会一步到胃，直接调用 PyFloat_FromDouble，然后在该函数内部会根据 C 的浮点数 2.71 创建对应的 PyFloatObject。而通过类型对象调用的话则会有一些额外的开销，因为这种方式最终也会调用相关的特定类型 API，但是在调用之前会干一些别的事情，比如类型检测等等。 所以 e = 2.71 比 float(2.71)、float(\"2.71\") 都要高效。 因此对于内置对象来说，可以调用它的类型对象去创建，这是最通用的逻辑。但这种做法会先兜个圈子，然后再去使用对象的特定类型 API，肯定没有直接使用特定类型 API 的效率高，也就是说 e = 2.71 这种方式是最快的，底层会直接调用 PyFloat_FromDouble。 对于其它对象也是同理，当然大部分情况下我们也都是使用特定类型 API 来创建的。以列表为例，比起 list()，我们更习惯使用［］。 还没结束，浮点数的实际创建过程我们还没有见到，因为最终还是调用特定类型 API 创建的。那么接下来就以 PyFloat_FromDouble 函数为例，看看浮点数在底层的创建过程。 // Objects/floatobject.c // 缓存池（链表）的最大长度，也就是缓存池最多能容纳多少个元素\n#define PyFloat_MAXFREELIST 100\n// 缓存池已经容纳了多少个元素，最多不能超过 PyFloat_MAXFREELIST\nstatic int numfree = 0;\n// 指向缓存池（链表）的头结点，因为缓存池是一个由 PyFloatObject 实例组成的链表\nstatic PyFloatObject *free_list = NULL;\n// 介绍引用计数时说过，引用计数如果为 0，那么对象会被销毁\n// 但是对象所占的内存则不一定释放，而是会缓存起来，浮点数也是如此\n// 销毁浮点数时，会将其放入缓存池中，创建浮点数时，也会优先从缓存池里面获取\n// 而缓存池是使用链表实现的，每一个节点都是一个 PyFloatObject 实例，然后 free_list 指向链表的头节点 PyObject *\nPyFloat_FromDouble(double fval)\n{ // 如果 op 不为 NULL，说明缓存池中有可用对象 PyFloatObject *op = free_list; if (op != NULL) { // 而一旦获取了，那么要维护 free_list，让它指向下一个节点 // 但问题来了，为啥获取下一个节点要通过 Py_TYPE，它不是负责返回 ob_type 吗？ // 相信你已经猜到原因了，因为 ob_type 充当了链表中的 next 指针 // 关于这里的细节，后续介绍缓存池的时候会详细说 free_list = (PyFloatObject *) Py_TYPE(op); // 然后还要将缓存池（链表）的节点个数减 1 numfree--; } else { // 否则说明缓存池里面没有空闲的可用对象，那么要重新申请内存 // PyObject_MALLOC 是基于 malloc 的一个封装，但对内存碎片做了优化 op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } // 走到这里说明内存分配好了，PyFloatObject 也创建了 // 但是不是还少了点啥呢？没错，显然内部的字段还没有初始化 // 还是那句话，内置类型的实例对象该分配多少空间，解释器了如指掌 // 因为通过 PyFloatObject 内部的字段一算就出来了 // 所以虽然对象创建了，但是 ob_refcnt、ob_type、以及 ob_fval 三个字段还没有初始化 // 因此还要将其 ob_refcnt 设置为 1，因为新创建的对象的引用计数是 1 // 以及将 ob_type 设置为指向 PyFloat_Type 的指针，因为它的类型是 float // 而 PyObject_INIT 专们用来设置 ob_refcnt 以及 ob_type，它的源码解释在下面 (void)PyObject_INIT(op, &PyFloat_Type); // 将内部的 ob_fval 字段设置为参数 fval，此时三个字段都已经初始化完毕 op->ob_fval = fval; // 变量是泛型指针 PyObject *，所以还要转成 PyObject * 之后才能返回 return (PyObject *) op;\n} // 补充：PyObject_INIT 的定义如下\n// Include/objimpl.h\n#define PyObject_INIT(op, typeobj) \\ _PyObject_INIT(_PyObject_CAST(op), (typeobj)) static inline PyObject*\n_PyObject_INIT(PyObject *op, PyTypeObject *typeobj)\n{ assert(op != NULL); // 设置实例对象的 ob_type Py_TYPE(op) = typeobj; // 如果 typeobj 是自定义的动态类，那么还要将类型对象的引用计数加 1 // 因为实例对象创建了，意味着类型对象会多一个引用 // 当然这只是针对于动态类，如果 typeobj 是内置的静态类型，那么不做处理 // 因为内置类型超越了引用计数规则，永远不会被析构 if (PyType_GetFlags(typeobj) & Py_TPFLAGS_HEAPTYPE) { Py_INCREF(typeobj); } // 将实例对象的引用计数初始化为 1 _Py_NewReference(op); return op;\n} // Objects/floatobject.c\nvoid\n_Py_NewReference(PyObject *op)\n{ if (_Py_tracemalloc_config.tracing) { _PyTraceMalloc_NewReference(op); } _Py_INC_REFTOTAL; // 初始化为 1 op->ob_refcnt = 1; _Py_AddToAllObjects(op, 1); _Py_INC_TPALLOCS(op);\n} 所以整体流程如下： 为实例对象分配内存空间，空间分配完了对象也就创建了，不过会优先使用缓存池； 初始化实例对象内部的引用计数和类型指针； 初始化 ob_fval 字段为参数 fval； 另外这里又体现了之前说的一个现象，对于自定义的类而言，想要创建实例对象必须要借助于类型对象。但使用特定类型 API 创建浮点数，却压根不需要类型对象 float，而是直接就创建了。创建完之后再让其 ob_type 字段指向 float，将类型和实例关联起来即可。 而之所以能这么做的根本原因就在于，内置类型的实例对象在底层都是静态定义好的，字段已经写死了，所以创建的时候不需要类型对象。解释器知道创建这样的对象需要分配多少内存，所以会直接创建，创建完之后再对内部字段进行初始化，比如设置引用计数和类型。 但对于我们自定义的类而言，想要创建实例对象就必须要借助于类型对象了。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么创建的","id":"45","title":"浮点数是怎么创建的"},"46":{"body":"当删除一个变量时，解释器会通过函数 Py_DECREF 来减少该变量指向的对象的引用计数，并判断引用计数减一之后是否为 0，如果为 0 则调用其类型对象的 tp_dealloc 回收该对象。 // Include/object.h\n#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op)) static inline void _Py_DECREF(const char *filename, int lineno, PyObject *op)\n{ // ... if (--op->ob_refcnt != 0) { // ... } else { _Py_Dealloc(op); }\n} // Objects/object.c\nvoid\n_Py_Dealloc(PyObject *op)\n{ destructor dealloc = Py_TYPE(op)->tp_dealloc; // 函数里面有个宏判断，编译展开之后就是下面这一行 (*dealloc)(op);\n} 所以当浮点数被销毁时，会调用 PyFloat_Type 的 tp_dealloc，这是显然的。而 PyFloat_Type 的 tp_dealloc 被初始化为 float_dealloc。 在 float_dealloc 函数内部我们会清晰地看到一个浮点数被销毁的全部过程，关于它的源代码，我们会在介绍缓存池的时候细说。总之到这里我们已经知道了浮点数被销毁的整个流程，下面来画张图描述一下。 以上就是浮点数对象被销毁的流程图，整个过程很简单。 在将对象的引用计数减 1 之后会判断是否为 0，如果为 0，则调用 _Py_Dealloc 销毁对象。而在 _Py_Dealloc 内部会获取对象的类型对象，然后拿到类型对象的 tp_dealloc 字段指向的函数。对于浮点数来说，这个函数就是 float_dealloc。 然后执行 float_dealloc(obj) 将对象销毁，但占用的空间会被缓存起来（取决于是否有缓存池以及缓存池的容量）。 所以整个流程理解起来没有任何难度，里面唯一没有说的就是 float_dealloc，即浮点数的具体销毁过程，这个等介绍缓存池的时候再一起说。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 浮点数是怎么销毁的","id":"46","title":"浮点数是怎么销毁的"},"47":{"body":"以上就是浮点数在底层的创建和销毁过程，下一篇文章来聊一聊浮点数的缓存池。当一些占用内存较小的对象在被销毁时，不会释放所占的内存，而是缓存起来。等下一次再使用的时候，直接从缓存池中获取，从而避免了频繁申请内存。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"12. 深度解密 Python 的浮点数是怎么实现的？ » 小结","id":"47","title":"小结"},"48":{"body":"浮点数这种对象经常容易被创建和销毁，因为它很简单，使用频率高。如果每次创建都借助操作系统分配内存、每次销毁都借助操作系统回收内存的话，那效率会低到什么程度，可想而知。 因此 Python 解释器在操作系统之上封装了一个内存池，在内存管理的时候会详细介绍，目前可以认为内存池就是解释器预先向操作系统申请的一部分内存，专门用于小对象的快速创建和销毁，从而避免了频繁和操作系统打交道，这便是 Python 的内存池机制。 但浮点数的使用频率很高，并且使用时还会创建和销毁大量的临时对象，举个例子: a = 95.5\nb = 117.3\nc = 108.9 avg = (a + b + c) / 3 计算平均值的时候，会先计算 a + b，创建一个临时对象。接着让临时对象和 c 相加再创建一个临时对象，然后除以 3得到结果。最后销毁临时对象，并将结果交给变量 avg。 尽管我们平常很少注意到这些，但运算背后所产生的对象的创建和销毁的次数，比我们想象的要多。特别是在循环的时候，会伴随大量的对象创建和销毁操作， 如果每次创建和销毁对象都要伴随着内存操作，这个时候即便有内存池机制，效率也是不高的，因为使用内存池虽然可以不经过操作系统，但它也会增加解释器系统的开销。 因此解释器在浮点数对象被销毁后，并不急着回收对象所占用的内存，换句话说其实对象还在，只是将该对象放入一个空闲的链表中。之前我们说对象可以理解为一片内存空间，对象如果被销毁，那么理论上内存空间要归还给操作系统，或者回到内存池中。但 Python 考虑到效率，并没有真正地释放内存，而是将对象放入到链表中，占用的内存还在。 后续如果需要创建新的浮点数对象时，那么从链表中直接取出之前放入的对象（我们认为被回收的对象），然后根据新的浮点数对象重新初始化对应的字段即可，这样就避免了内存分配造成的开销。而这个链表就是我们说的缓存池，当然不光浮点数对象有缓存池，Python 的很多其它对象也有对应的缓存池，比如列表。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 楔子","id":"48","title":"楔子"},"49":{"body":"下面看一下浮点数的缓存池的具体细节。 // Objects/floatobject.c // 缓存池（链表）的最大长度\n// 因此池子里面最多容纳 100 个 PyFloatobject\n#define PyFloat_MAXFREELIST 100 // 缓存池已经容纳了多少个 PyFloatobject\nstatic int numfree = 0;\n// 指向缓存池（链表）的头节点\nstatic PyFloatObject *free_list = NULL; 我们观察一下 free_list，发现它是一个 PyFloatObect *，这就说明缓存池（链表）中的每一个节点都是 PyFloatObject 实例。但以我们刷 Leetcode 的经验，链表里的每个节点应该有一个 next 字段指向下一个节点，可 PyFloatObject 里面似乎并没有这样的字段啊。 相信你已经猜到原因了，因为解释器是使用 ob_type 字段来指向下一个对象。本来 ob_type 指向的应该是 PyFloat_Type，但在缓存池中指向的是下一个 PyFloatObject。 以上就是浮点数的缓存池，说白了就是一个链表，free_list 指向链表的头节点，节点之间通过 ob_type 字段充当 next 指针。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 缓存池的实现细节","id":"49","title":"缓存池的实现细节"},"5":{"body":"Python 的变量只是一个名字，如果站在 C 语言的角度来看，那么就是一个指针。所以 Python 的变量保存的其实是对象的内存地址，或者说指针，而指针指向的内存存储的才是对象。 所以在 Python 中，我们都说变量指向了某个对象。在其它静态语言中，变量相当于是为某块内存起的别名，获取变量等于获取这块内存所存储的值。而 Python 中变量代表的内存所存储的不是对象，而是对象的指针（或者说引用）。 我们举例说明，看一段 C 代码。 #include <stdio.h> void main()\n{ int a = 666; printf(\"address of a = %p\\n\", &a); a = 667; printf(\"address of a = %p\\n\", &a);\n} 编译执行一下： 赋值前后地址都是 0x7fff9eda521c，没有变化，再来看一段 Python 代码。 a = 666\nprint(hex(id(a))) # 0x7febf803a3d0 a = 667\nprint(hex(id(a))) # 0x7fec180677b0 我们看到 Python 里面输出的地址发生了变化，下面分析一下原因。 首先在 C 中，创建一个变量的时候必须规定好类型，比如 int a = 666，那么变量 a 就是 int 类型，以后在所处的作用域中就不可以变了。如果这时候再设置 a = 777，那么等于是把内存中存储的 666 换成 777，a 的地址和类型是不会变化的。 而在 Python 中，a = 666 等于是先开辟一块内存，存储的值为 666，然后让变量 a 指向这片内存，或者说让变量 a 保存这块内存的地址。然后 a = 777 的时候，再开辟一块内存，然后让 a 指向存储 777 的内存，由于是两块不同的内存，所以它们的地址是不一样的。 所以 Python 的变量只是一个和对象关联的名字，它代表的是对象的指针。换句话说 Python 的变量就是个便利贴，可以贴在任何对象上，一旦贴上去了，就代表这个对象被引用了。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量其实是指针","id":"5","title":"变量其实是指针"},"50":{"body":"我们以 PyFloat_FromDouble 这个 API 为例，再回顾一下浮点数的创建, // Objects/floatobject.c PyObject *\nPyFloat_FromDouble(double fval)\n{ // 获取缓存池的头结点指针 PyFloatObject *op = free_list; // 如果 op 不为 NULL，说明它指向了 PyFloatObject // 换句话说就是，缓存池里面有可用节点 if (op != NULL) { // 维护 free_list，让它指向链表的下一个节点 free_list = (PyFloatObject *) Py_TYPE(op); // 缓存池的节点个数减 1 numfree--; } else { op = (PyFloatObject*) PyObject_MALLOC(sizeof(PyFloatObject)); if (!op) return PyErr_NoMemory(); } (void)PyObject_INIT(op, &PyFloat_Type); op->ob_fval = fval; return (PyObject *) op;\n} 在链表中，ob_type 被用于指向下一个节点，换言之 ob_type 保存的是下一个 PyFloatObject 的地址。不过话虽如此，可 ob_type 的类型仍是 PyTypeObject *。因此在存储的时候，PyFloatObject * 一定是先转成了 PyTypeObject *，之后再交给 ob_type 保存。因为对于指针来说，是可以任意转化的，我们一会儿看 float_dealloc 的时候就知道了。 那么同理，这里的 Py_TYPE(op) 在获取下一个节点的指针之后，还要再转成 PyFloatObject *，然后才能交给 free_list 保存。如果没有下一个对象了，那么 free_list 就是 NULL，在下一次分配的时候，上面的 if (op!=NULL) 就会不成立，从而走下面的 else，使用 PyObject_MALLOC 重新分配内存。 既然对象创建时可以从缓存池获取，那么销毁的时候，肯定要放入到缓存池中。而销毁对象时，会调用类型对象的 tp_dealloc（析构函数），对于浮点数而言就是 float_dealloc，我们看一下源代码。 static void\nfloat_dealloc(PyFloatObject *op)\n{ // 如果要放入浮点数的缓存池，那么它必须是浮点数 if (PyFloat_CheckExact(op)) { // 如果缓存池中的节点个数已经达到了 PyFloat_MAXFREELIST，那么直接释放掉 if (numfree >= PyFloat_MAXFREELIST) { PyObject_FREE(op); return; } // 否则放入到缓存池中 // 缓存池的节点个数加 1 numfree++; // 因为对象要成为链表的新头结点，那么它的 ob_type（充当 next）要指向当前头结点 // 所以将 ob_type 的值设置为 state->free_list 即可 // 但 ob_type 字段的类型为 PyTypeObject *，而 free_list 是 PyFloatobject * // 因此赋值之后，要将类型转换一下 Py_TYPE(op) = (struct _typeobject *)free_list; // 然后将 op 赋值为 state->free_list，也就是让 free_list 指向新的头结点 free_list = op; } // 如果销毁的对象不是浮点数，而是 float 子类的实例，那么直接释放内存 else Py_TYPE(op)->tp_free((PyObject *)op);\n} 以上便是浮点数缓存池的具体实现，说白了缓存池的作用只有一个，就是在对象被销毁的时候不释放所占的内存，下次创建新的对象时能够直接拿来用。因为内存没有被释放，因此创建起来就会快很多。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 再探浮点数的创建与销毁","id":"50","title":"再探浮点数的创建与销毁"},"51":{"body":"下面我们修改解释器源代码，当创建和销毁浮点数的时候，打印一些日志信息。 日志信息以字典的形式打印，里面有三个 key，含义如下： action：如果值为 \"from_freelist\"，表示从缓存池获取对象；如果值为 \"to_freelist\" 表示对象放入缓存池。 numfree：从缓存池获取对象、或将对象放入缓存池之后的元素个数。 address of object：创建或销毁的对象的地址。 当创建 f1 的时候，指向的浮点数会从缓存池中获取，日志信息中的对象地址显然和 Python 里打印的地址是一样的。然后 del f1，会将对象放入缓存池中。最后新建一个变量 f2，显然它指向的浮点数会复用 f1 指向的浮点数的内存。 再举个例子： 我们重新创建变量 f1、f2，并打印对象地址，然后删除 f1、f2 变量，之后再重新创建 f1、f2 变量并打印对象地址，结果发现地址在删除前后正好是相反的。至于原因，如果思考一下将对象放入缓存池、以及从缓存池获取对象时所采取的策略，那么很容易就明白了。 因为 del f1,f2 的时候会先删除 f1，再删除 f2。删除 f1 的时候，会将 f1 指向的对象作为链表中的头结点，然后删除 f2 的时候，会将 f2 指向的对象作为链表中新的头结点，所以之前 f1 指向的对象就变成了链表中的第二个节点。 浮点数缓存池在添加节点的时候，采用的是头插法。 而获取的时候，也会从链表的头部开始获取，所以当重新创建变量 f1 的时候，其指向的对象使用的是之前变量 f2 指向的对象所占的内存，而一旦获取，那么 free_list 指针会指向下一个节点。然后创建变量 f2 的时候，其指向的对象使用的就是之前变量 f1 指向的对象所占的内存。 因此前后打印的地址是相反的，所以我们算是通过实践从另一个角度印证了之前分析的结论。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 侵入 PyFloatObject","id":"51","title":"侵入 PyFloatObject"},"52":{"body":"有时我们想观察底层数据结构的表现行为时，不一定非要修改解释器，因为那样太麻烦，还要重新编译。Python 在上层提供了一种方式，可以让我们通过 Python 的类轻松地模拟 C 的结构体。 from ctypes import * class PyObject(Structure): \"\"\" 继承 ctypes.structure，便可以得到c的结构体 然后通过 fields 指定结构体字段 \"\"\" # _fields_ 是一个列表，内部的元组对应结构体的字段 _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), ] # ob_refcnt 是 Py_ssize_t 类型，等价于 c_ssize_t # 至于 ob_type，我们就指定 void *，因为暂时不用这个字段 class PyFloatObject(PyObject): \"\"\" 继承 Pyobject，相当于结构体的嵌套 \"\"\" _fields_ = [ (\"ob_fval\", c_double) ] e = 2.71\n# 创建 PyFloatObject 实例，返回它的指针\n# from_address 表示根据对象的地址创建\nf = PyFloatObject.from_address(id(e))\n# 此时 e 和 f 都指向了 2.71 这个浮点数 # 注意接下来会发生神奇的一幕\nprint(e) # 2.71\nprint(hex(id(e))) # 0x1f94d2382f0 # f 等价于底层的 PyFloatObject *，修改 ob_fval 字段\nf.ob_fval = 3.14\nprint(e) # 3.14\nprint(hex(id(e))) # 0x1f94d2382f0 我们看到 id(e) 在前后并没有发生改变，证明 e 指向的始终是同一个对象，但是它的值却变了。咦，不是说浮点数是不可变对象吗？如果想变的话只能创建一个新的浮点数，这样一来前后打印的地址应该会变才对啊。 首先说明结论是没错的，可这是从 Python 的角度而言。如果是从解释器的角度来看的话，没有什么可变不可变，只要我们想让它可变，那么它就是可变的。 另外为了更好地观察底层数据结构的表现，我们后面会经常使用这种方式，而且会介绍更多的骚操作，但是切记这种动态修改解释器的做法不可用于生产环境。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 通过 ctypes 模拟底层数据结构","id":"52","title":"通过 ctypes 模拟底层数据结构"},"53":{"body":"以上就是浮点数的缓存池机制，简单来说是一种空间换时间的做法。 为了避免频繁地和内核打交道，CPython 引入了内存池机制，事先会向操作系统申请一部分内存，然后根据大小划分成不同的单元，按需分配。这样就无需频繁和操作系统的内核打交道了，因为系统调用是代价昂贵的操作。 但有了内存池还不够，我们知道 Python 对象是分配在堆上的，而在堆上分配内存效率要比栈差很多。所以又引入了缓存池，对象在被销毁后不释放所占内存，而是通过一个链表串起来，留着下次备用。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"13. 对象被销毁之后所占的内存一定会释放吗？解密浮点数的缓存池机制 » 小结","id":"53","title":"小结"},"54":{"body":"本篇文章来聊一聊浮点数支持的操作，之前说过实例对象的相关操作都定义在类型对象里面，所以我们需要查看 PyFloat_Type。 // Objects/floatobject.c\nPyTypeObject PyFloat_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"float\", sizeof(PyFloatObject), // 浮点数的 __repr__ 方法 (reprfunc)float_repr, /* tp_repr */ // 浮点数作为数值对象拥有的算数操作 &float_as_number, /* tp_as_number */ // ... // 浮点数的哈希操作 (hashfunc)float_hash, /* tp_hash */ // ... // 浮点数支持的比较操作 float_richcompare, /* tp_richcompare */ // ...\n}; 还是之前说的，Python 底层的函数命名以及 API 都是很有规律的，举个例子： tp_repr 字段表示实例对象的字符串格式化，在 PyFloat_Type 里面它被赋值为 float_repr。 tp_hash 字段表示实例对象的哈希操作，在 PyFloat_Type 里面它被赋值为 float_hash。 tp_richcompare 字段表示实例对象的比较操作，所有的比较运算均由该字段负责实现，在 PyFloat_Type 里面它被赋值为 float_richcompare。 下面我们来通过源码看一下底层实现。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 楔子","id":"54","title":"楔子"},"55":{"body":"由于 PyFloat_Type 没有实现 tp_str（字段的值为 0 ），所以打印一个浮点数会执行 tp_repr，它对应的具体实现为 float_repr 函数。 // Objects/floatobject.c static PyObject *\nfloat_repr(PyFloatObject *v)\n{ PyObject *result; // 返回值 char *buf; // 将 Python 浮点数转成 C 的浮点数，然后再转成字符串 buf = PyOS_double_to_string(PyFloat_AS_DOUBLE(v), 'r', 0, Py_DTSF_ADD_DOT_0, NULL); if (!buf) return PyErr_NoMemory(); // 基于 C 字符串创建 Python 字符串 result = _PyUnicode_FromASCII(buf, strlen(buf)); // 释放 buf，然后返回 PyMem_Free(buf); return result;\n} 比较简单，当然具体的转换逻辑由 PyOS_double_to_string 函数负责，内部最终会调用 C 的库函数，感兴趣可以看一下。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的字符串打印","id":"55","title":"浮点数的字符串打印"},"56":{"body":"获取浮点数的哈希值会执行 tp_hash，它对应的具体实现为 float_hash。 // Objects/floatobject.c\nstatic Py_hash_t\nfloat_hash(PyFloatObject *v)\n{ return _Py_HashDouble(v->ob_fval);\n} 具体的哈希计算逻辑由 _Py_HashDouble 负责，通过 v->ob_fval 拿到 C 浮点数，然后传进去计算哈希值。 感兴趣可以看一下具体的哈希值计算逻辑，该函数位于 Python/pyhash.c 中。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的哈希值","id":"56","title":"浮点数的哈希值"},"57":{"body":"浮点数之间的比较操作由 tp_richcompare 字段负责实现，该字段的值为 float_richcompare。 // Include/object.h\n#define Py_LT 0 // 小于\n#define Py_LE 1 // 小于等于\n#define Py_EQ 2 // 等于\n#define Py_NE 3 // 不等于\n#define Py_GT 4 // 大于\n#define Py_GE 5 // 大于等于 // Objects/floatobject.c\nstatic PyObject*\nfloat_richcompare(PyObject *v, PyObject *w, int op)\n{ // 假设在 Python 里面执行了 3.14 == 2.71 // 那么这里的 v 和 w 就会指向 3.14 和 2.71，而 op 就是 Py_EQ double i, j; int r = 0; assert(PyFloat_Check(v)); // 通过 ((PyFloatObject *) v)->ob_fval 拿到具体的 C 浮点数 i = PyFloat_AS_DOUBLE(v); // 变量只是泛型指针 PyObject *，它究竟指向什么类型的对象是需要判断的 // 对于 v == w 来讲，如果能执行该函数，我们只能确保 v 一定指向浮点数，但 w 则不一定 // 所以需要判断，如果 w 的类型是 float 或者 float 的子类，那么转成 C double 并赋值给 j if (PyFloat_Check(w)) // 绝大部分情况都会触发此分支 j = PyFloat_AS_DOUBLE(w); else if (!Py_IS_FINITE(i)) { // ... } else if (PyLong_Check(w)) { // ... } else /* w isn't float or int */ goto Unimplemented; Compare: PyFPE_START_PROTECT(\"richcompare\", return NULL) // 拿到 i 和 j 之后，判断 op 是哪一种操作符，然后执行相应的比较逻辑 switch (op) { case Py_EQ: r = i == j; break; case Py_NE: r = i != j; break; case Py_LE: r = i <= j; break; case Py_GE: r = i >= j; break; case Py_LT: r = i < j; break; case Py_GT: r = i > j; break; } PyFPE_END_PROTECT(r) return PyBool_FromLong(r); Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 该函数的代码量还是有一些大的，但逻辑很好理解，主要是会对 w 做一些类型上的检测。因为 w 不一定是浮点数，比如 3.14 != [] 同样会触发该函数，但函数里的 w 指向的就不是浮点数，而是列表。 不过大部分情况下，两个对象比较的时候，如果符号左侧是浮点数，那么右侧基本也是浮点数。所以基本上都会走开始的 if 分支，然后进入比较逻辑。但如果符号右侧不是浮点数，那么会执行剩下的分支，逻辑会更复杂一些。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的比较操作","id":"57","title":"浮点数的比较操作"},"58":{"body":"最后是重头戏，来看看浮点数是如何运算的。由于加减乘除等算术操作很常见，所以解释器将其抽象成 PyNumberMethods 方法簇。对于数值型对象来说，它的类型对象会实现此方法簇，并由 tp_as_number 字段指向。 // Include/cpython/object.h\ntypedef struct { binaryfunc nb_add; binaryfunc nb_subtract; binaryfunc nb_multiply; binaryfunc nb_remainder; binaryfunc nb_divmod; ternaryfunc nb_power; unaryfunc nb_negative; unaryfunc nb_positive; unaryfunc nb_absolute; inquiry nb_bool; unaryfunc nb_invert; binaryfunc nb_lshift; binaryfunc nb_rshift; binaryfunc nb_and; binaryfunc nb_xor; binaryfunc nb_or; // ...\n} PyNumberMethods; PyNumberMethods 这个结构体在前面已经介绍过，每个字段都是一个函数指针，对应一个算术操作。而根据参数个数的不同，这些函数可以分为多种。 unaryfunc： 一元函数，只接收一个参数，返回 PyObject *； binaryfunc： 二元函数，接收两个参数，返回 PyObject *； ternaryfunc： 三元函数，接收三个参数，返回 PyObject *； inquiry：一元函数，接收一个参数，但返回的是 int。 它们本质上就是解释器基于参数的类型和个数而起的别名，除了以上这些，还有很多其它的别名，具体可以查看 Include/object.h。 由于浮点数是数值型对象，所以 PyFloat_Type 实现了该方法簇，值为 float_as_number，来看一下，它位于 Objects/floatobject.c 中。 像 float_add 负责浮点数的加法运算，float_sub 负责浮点数的减法运算，都比较简单。但我们看到有的函数指针被赋值成了 0，如果为 0 则表示不支持相应操作，比如浮点数不支持位运算。 在 C 语言中，给指针类型的字段赋值为 0 和赋值为 NULL 是等价的。 好，下面我们以加法运算为例，看一下具体实现。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ // 显然两个 Python 浮点数相加，一定是先转成 C 的浮点数，然后再相加 // 加完之后再根据结果创建新的 Python 浮点数 double a,b; // 声明两个 double 变量 // CONVERT_TO_DOUBLE 是一个宏，从名字上也能看出来它的作用 // 将 PyFloatObject 里面的 ob_fval 抽出来，赋值给 double 变量 CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) // 将 a 和 b 相加，然后再重新赋值给 a a = a + b; PyFPE_END_PROTECT(a) // 根据相加后的结果创建新的 PyFloatObject 对象 // 并将其指针转成 PyObject * 之后返回 return PyFloat_FromDouble(a);\n} 以上就是浮点数的加法运算，核心如下： 定义两个 double 变量 a 和 b。 将相加的两个 Python 浮点数维护的值（ob_fval）抽出来，交给 a 和 b。 让 a 和 b 相加，将相加的结果传入 PyFloat_FromDouble 函数中创建新的 PyFloatObject，然后返回其 PyObject *。 另外 float_add 里面还有两个宏我们没有说，分别是：PyFPE_START_PROTECT 和 PyFPE_END_PROTECT，它们是做什么的呢？首先浮点数计算一般都遵循 IEEE-754 标准，如果计算时出现了错误，那么需要将 IEEE-754 异常转换成 Python 异常，而这两个宏就是用来干这件事情的。 所以我们不需要管它，这两个宏定义在 Include/pyfpe.h 中，并且已经在 Python3.9 的时候被移除了。 以上便是浮点数的加法运算，所谓的浮点数在底层就是一个 PyFloatObject 结构体实例。而结构体实例无法直接相加，所以必须先将结构体中维护的值抽出来，对于浮点数而言就是 ob_fval，然后转成 C 的 double 再进行相加。最后根据相加的结果创建新的结构体实例，于是新的 Python 对象便诞生了。 假设 a, b = 1.1, 2.2，那么 c = a + b 的流程如下所示： 但如果是 C 的两个浮点数相加，那么编译之后就是一条简单的机器指令，然而 Python 则需要额外做很多其它工作。并且后续在介绍整数的时候，你会发现 Python 的整数相加更麻烦，但对于 C 而言同样是一条简单的机器码就可以搞定。 所以为什么 Python 会比 C 慢很多倍，从一个简单的加法上面就可以看出来。 以上是浮点数的加法操作，至于减法、乘法、除法等操作也是类似的。 // Objects/floatobject.c\nstatic PyObject *\nfloat_add(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"add\", return 0) a = a + b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_sub(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"subtract\", return 0) a = a - b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_mul(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); PyFPE_START_PROTECT(\"multiply\", return 0) a = a * b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} static PyObject *\nfloat_div(PyObject *v, PyObject *w)\n{ double a,b; CONVERT_TO_DOUBLE(v, a); CONVERT_TO_DOUBLE(w, b); if (b == 0.0) { PyErr_SetString(PyExc_ZeroDivisionError, \"float division by zero\"); return NULL; } PyFPE_START_PROTECT(\"divide\", return 0) a = a / b; PyFPE_END_PROTECT(a) return PyFloat_FromDouble(a);\n} 代码逻辑是类似的，整个过程就是将 Python 浮点数里面的值抽出来，得到 C 浮点数，然后进行运算，再基于运算的结果创建 Python 浮点数，并返回它的泛型指针。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 浮点数的算数操作","id":"58","title":"浮点数的算数操作"},"59":{"body":"到此浮点数就介绍完了，之所以先介绍浮点数，是因为浮点数最简单。至于整数，其实并没有那么简单，因为它的值在底层是通过数组存储的。而浮点数的值则是用一个 double 类型的字段来维护，会更简单一些，所以我们就先拿浮点数开刀了。 首先我们介绍了浮点数的创建和销毁，创建有两种方式，分别是使用对象的特定类型API 和调用类型对象。前者速度更快，但只适用于内置数据结构，而后者更加通用。 销毁的时候则调用类型对象内部的 tp_dealloc 字段指向的 float_dealloc 函数。当然为了保证效率，避免内存的频繁创建和回收，解释器为浮点数引入了缓存池机制，我们也分析了背后的原理。 最后浮点数还支持数值运算，PyFloat_Type 的 tp_as_number 字段指向了 PyNumberMethods 结构体实例 float_as_number，里面有大量的函数指针，每个指针指向了具体的函数，专门用于浮点数的运算。至于运算的具体逻辑，我们也以加法为例详细介绍了 float_add 函数的实现。核心就是将 Python 对象内部的值抽出来，转成 C 的类型，然后运算，最后再根据运算的结果创建 Python 对象，并返回泛型指针。 关于浮点数，如果你还想知道它的更多内容，可以进入源码中，大肆探索一番。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"14. 浮点数支持的操作是怎么实现的？ » 小结","id":"59","title":"小结"},"6":{"body":"再来看看变量之间的传递，在 Python 中是如何体现的。 a = 666\nprint(hex(id(a))) # 0x1f4e8ca7fb0 b = a\nprint(hex(id(b))) # 0x1f4e8ca7fb0 我们看到打印的地址是一样的，再用一张图解释一下。 a = 666 的时候，先开辟一份内存，再让 a 存储对应内存的地址；然后 b = a 的时候，会把 a 拷贝一份给 b，所以 b 和 a 存储了相同的地址，它们都指向了同一个对象。 因此说 Python 是值传递、或者引用传递都是不准确的，准确的说 Python 是变量的值传递，对象的引用传递。因为 Python 的变量可以认为是 C 的一个指针，在 b = a 的时候，等于把 a 指向的对象的地址（a 本身）拷贝一份给 b，所以对于变量来说是值传递；然后 a 和 b 又都是指向对象的指针，因此对于对象来说是引用传递。 在这个过程中，对象没有重复创建，它只是多了一个引用。 另外还有最关键的一点，Python 的变量是一个指针，当传递变量的时候，传递的是指针；但是在操作变量的时候，会操作变量指向的内存。所以 id(a) 获取的不是 a 的地址，而是 a 指向的内存的地址（在底层其实就是 a 本身）；同理 b = a，是将 a 本身，或者说将 a 存储的、指向某个具体的对象的地址传递给了 b。 另外在 C 的层面，显然 a 和 b 属于指针变量，那么 a 和 b 有没有地址呢？显然是有的，只不过在 Python 中是获取不到的，解释器只允许获取对象的地址。 我们再举个函数的例子： def some_func(num): print(\"address of local num\", hex(id(num))) num = 667 print(\"address of local num\", hex(id(num))) num = 666\nprint(\"address of global num\", hex(id(num)))\nsome_func(num)\n\"\"\"\naddress of global num 0x2356cd698d0\naddress of local num 0x2356cd698d0\naddress of local num 0x2356c457f90\n\"\"\" 函数的参数也是一个变量，所以 some_func(num) 其实就是把全局变量 num 存储的对象的地址拷贝一份给局部变量 num，所以两个 num 指向了同一个对象，打印的地址相同。然后函数内部又执行了 num = 667，相当于让局部变量指向新的对象，或者说保存新对象的地址，因此打印的结果发生变化。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 值传递？引用传递？","id":"6","title":"值传递？引用传递？"},"60":{"body":"本篇文章来聊一聊复数，尽管在日常开发中基本用不到复数，但对它有一个深刻的认识，知道它是做什么的，个人觉得还是很有必要的。另外，本系列力求精致、详细，因此每一个细节都要到位。 那么下面就来解释一下什么是复数。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 楔子","id":"60","title":"楔子"},"61":{"body":"复数是一种用来扩展实数的数，它由实数和虚数两部分组成，用来解决实数范围内无法解决的问题，基本形式如下。 形如 a + bi 的数，我们称之为复数，其中 a 和 b 是浮点数（实数），i 是虚数，满足 i 的平方等于 -1。 所以复数不仅包含实数，还包含虚数，形式为 a + bi，然后 a 被称为复数的实部，b 被称为复数的虚部。如果两个复数的实部相同，虚部相反，那么它们互为共轭复数，比如 1 + 3i 和 1-3i。 如果对复数的实部和虚部进行平方和再开根号，便可得到复数的模，比如 3 + 4i 的模便是 5。 复数的引入可以帮助我们更好地理解和解决许多数学以及物理问题，特别是在涉及振动、波动和电路分析等领域，比如： 电工程：分析交流电路和信号处理； 控制系统：用于系统稳定性分析； 量子力学：描述波函数和量子态； 流体力学：用于描述流动问题； 当然复数也有自己的运算规则。 加法：两个复数相加等于对应的实部和虚部分别相加 减法：两个复数相减等于对应的实部和虚部分别相减 乘法：两个复数的乘法使用分配率 除法：两个复数的乘法涉及到共轭复数 以上就是复数的基本概念，下面来看看 Python 的复数是怎么实现的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 什么是复数","id":"61","title":"什么是复数"},"62":{"body":"复数的实现比想象中要简单很多，说白了就是维护两个浮点数而已。 // Include/complexobject.h\ntypedef struct { double real; double imag;\n} Py_complex; typedef struct { PyObject_HEAD Py_complex cval;\n} PyComplexObject; 我们看到复数的结构和浮点数是非常相似的，只不过浮点数只用一个 double 来维护具体的值。而复数因为存在实部和虚部，因此需要两个 double，其中 real 维护复数的实部，imag 维护复数的虚部。 # 在别的语言中，虚数都是用 i 来表示\n# 而 Python 觉得 i 是一个很常用的变量，所以使用 j 来表示虚数\ncpx = 3 + 4j\n# 其中 3 为实部，4 为虚部\nprint(cpx) # (3+4j)\n# 如果虚部为 1，那么要写成 1j，不能只写 j，否则解释器会认为 j 是一个变量\nprint(3 + 1j) # (3+1j)\n# 复数的实部可以为 0\nprint(2j) # 2j\n# 当然虚部也可以为 0，如果虚部为 0，那么要写成 0j，不能不写\n# 因为 3 和 3+0j 不是等价的，前者是整数，后者是复数\nprint(0j) # 0j\nprint(3 + 0j) # (3+0j) 整个过程非常简单，当解释器看到 3 + 4j 的时候，就知道要创建复数了，因为解释器对内置的数据结构了如指掌，所以在底层会创建一个 PyComplexObject 结构体实例。 没有什么难度，和浮点数是类似的。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的底层结构","id":"62","title":"复数的底层结构"},"63":{"body":"类型对象定义的操作，决定了实例对象的行为，所以我们需要查看复数的类型都定义了哪些操作。复数的类型在 Python 里面对应 <class 'complex'>，那么根据解释器的命名规则，它在底层应该由 PyComplex_Type 负责实现。 // Objects/complexobject.c\nPyTypeObject PyComplex_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"complex\", sizeof(PyComplexObject), // ... &complex_as_number, /* tp_as_number */ 0, /* tp_as_sequence */ 0, /* tp_as_mapping */ // ... complex_richcompare, /* tp_richcompare */ // ... complex_methods, /* tp_methods */ complex_members, /* tp_members */ // ...\n}; complex 的类型也是 type，它的实例对象的大小就是 PyComplexObject 结构体的大小。然后我们看下它的 tp_members，该字段表示实例对象有哪些属性，它被赋值为 complex_members。 它有两个属性，分别是 real 和 imag，类型为 double，并且是只读的。那么在 Python 里面创建复数之后，便可以获取 real 和 imag 属性。 cpx = 3 + 4j\n# 注意：虽然写的是 3 + 4j，但实部和虚部都是浮点数\nprint(cpx.real) # 3.0\nprint(cpx.imag) # 4.0 然后 complex 类型还实现了 tp_richcompare，用于复数之间的比较，但对于复数来说，比较操作只支持等于和不等于。 // Objects/complexobject.c\nstatic PyObject *\ncomplex_richcompare(PyObject *v, PyObject *w, int op)\n{ PyObject *res; // 比较结果 Py_complex i; // 复数的实部和虚部组成的结构体 int equal; // 两个复数是否相等 // 如果 op 不是 ==、也不是 !=，那么报错 // 因为复数只支持这两种比较操作 if (op != Py_EQ && op != Py_NE) { goto Unimplemented; } assert(PyComplex_Check(v)); // 获取复数 v 的 cval 字段，并赋值给 i // 即 i = ((PyComplexObject *) v)->cval TO_COMPLEX(v, i); if (PyLong_Check(w)) { // ... } else if (PyFloat_Check(w)) { // ... } else if (PyComplex_Check(w)) { Py_complex j; // j = ((PyComplexObject *) w)->cval TO_COMPLEX(w, j); // 如果实部和虚部都相等，那么两个复数相等 equal = (i.real == j.real && i.imag == j.imag); } else { goto Unimplemented; } // equal 为 1，表示两个复数相等，为 0 表示两个复数不相等 // 如果 op 为 Py_EQ，那么相等返回 True，不等返回 False // 如果 op 为 Py_NE，那么相等返回 False，不等返回 True if (equal == (op == Py_EQ)) res = Py_True; else res = Py_False; Py_INCREF(res); return res; Unimplemented: Py_RETURN_NOTIMPLEMENTED;\n} 以上就是复效的比较，核心就是比较对应的实部和虚部是否均相等。 由于复数也属于数值型对象，所以它也实现了 tp_as_number 方法簇。 我们以复数的加法和减法为例，看一下源码细节。 // Objects/complexobject.c // 负责将两个 Py_complex 结构体实例相加\nPy_complex\n_Py_c_sum(Py_complex a, Py_complex b)\n{ // 复数的值由 Py_complex 结构体维护，它里面有 real 和 imag 两个字段 Py_complex r; // 两个 Py_complex 实例相加的时候，等于内部的 real 和 imag 字段分别相加 r.real = a.real + b.real; r.imag = a.imag + b.imag; return r;\n} // 负责将两个 Py_complex 结构体实例相减\nPy_complex\n_Py_c_diff(Py_complex a, Py_complex b)\n{ Py_complex r; r.real = a.real - b.real; r.imag = a.imag - b.imag; return r;\n} // 基于 Py_complex 创建 PyComplexObject\nPyObject *\nPyComplex_FromCComplex(Py_complex cval)\n{ PyComplexObject *op; // 为 PyComplexObject 结构体实例申请内存 // 我们看到内存大小可以直接计算出来，因为内置数据结构在底层是写死的 // 解释器对它们了如指掌，直接通过 sizeof 算一下即可，不需要借助类型对象 op = (PyComplexObject *) PyObject_MALLOC(sizeof(PyComplexObject)); // 如果 op 为 NULL，表示内存不够，申请失败 if (op == NULL) return PyErr_NoMemory(); // 初始化引用计数，并将 op->ob_type 初始化为 &PyComplex_Type // 也就是让实例对象和类型对象建立联系 (void)PyObject_INIT(op, &PyComplex_Type); // 最后初始化 cval 字段，它是 Py_complex 结构体实例，负责维护复数具体的值 op->cval = cval; // 转成泛型指针 PyObject * 之后返回 return (PyObject *) op;\n} // 复数的加法\nstatic PyObject *\ncomplex_add(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_add\", return 0) // 调用 _Py_c_sum 进行相加，得到新的 Py_complex result = _Py_c_sum(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} // 复数的减法\nstatic PyObject *\ncomplex_sub(PyObject *v, PyObject *w)\n{ Py_complex result; // 将两个复数的 cval 抽出来，赋值给 a 和 b Py_complex a, b; TO_COMPLEX(v, a); TO_COMPLEX(w, b); PyFPE_START_PROTECT(\"complex_sub\", return 0) // 调用 _Py_c_diff 进行相减，得到新的 Py_complex result = _Py_c_diff(a, b); PyFPE_END_PROTECT(result) // 基于 Py_complex 创建 PyComplexObject return PyComplex_FromCComplex(result);\n} 以上就是复数的加法和减法，比较简单，至于其它操作，感兴趣可以自己阅读一下源码。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 复数的行为","id":"63","title":"复数的行为"},"64":{"body":"本次我们就介绍了复数的底层结构以及它的一些相关操作，总的来说和浮点数是比较像的。不过还是像上面说的那样，对于我们日常开发来说，复数用的并不多，甚至可以说是几乎不用，但通过它来加深对源码的理解以及感受 Python 对象的设计哲学，还是非常有意义的。 下一篇文章来说一说整数，我们知道 Python 整数不会溢出，那么它是怎么设计的呢？背后有什么黑科技呢？我们下一篇文章再聊。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"15. 解密 Python 的复数是怎么实现的？它有什么用途呢？ » 小结","id":"64","title":"小结"},"65":{"body":"本篇文章来分析一下 Python 整数的实现原理，我们知道 Python 整数是不会溢出的，换句话说它可以计算无穷大的数。只要你的内存足够，它就能计算，但对于 C 来说显然是不行的，C 能保存的整数范围是有限的。 但问题是，Python 的底层是 C 实现的，那么它是怎么做到整数不溢出的呢？想要知道答案，那么看一下整数在底层是怎么定义的就行了。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 楔子","id":"65","title":"楔子"},"66":{"body":"Python 整数在底层由 PyLongObject 结构体负责承载，看一下它的定义。 // Include/longobject.h\ntypedef struct _longobject PyLongObject; // Include/longintrepr.h\nstruct _longobject { PyObject_VAR_HEAD digit ob_digit[1];\n}; 里面每个字段的含义如下： ob_refcnt：对象的引用计数； ob_type：对象的类型； ob_size：数组 ob_digit 的长度； ob_digit：digit 类型的数组； 别的先不说，就冲里面的 ob_size 我们就可以思考一番。首先 Python 的整数有大小、但应该没有长度的概念吧，那为什么会有一个 ob_size 呢？从结构体字段来看，这个 ob_size 表示数组 ob_digit 的长度，而这个 ob_digit 显然是用来维护具体的值。 相信你已经猜到 Python 整数不会溢出的秘密了，因为它内部通过数组来存储整数，所以能存储无限大的数。因此答案出来了，虽然整数没有我们生活中的那种长度的概念，但它是个变长对象，因为不同的整数占用的内存可能是不一样的。尽管它没有字符串、列表那种长度的概念，或者说无法对整数使用 len 函数，但它是个变长对象。 接下来的重点就是这个 ob_digit 数组，我们要从它的身上挖掘信息，看看整数是怎么放在里面的，不过首先我们要搞清楚这个 digit 是什么类型。 // Include/longintrepr.h\n#if PYLONG_BITS_IN_DIGIT == 30 typedef uint32_t digit;\n#elif PYLONG_BITS_IN_DIGIT == 15 typedef unsigned short digit;\n#else #error \"PYLONG_BITS_IN_DIGIT should be 15 or 30\" PYLONG_BITS_IN_DIGIT 是一个宏，这个宏是做什么的我们先不管，总之如果机器是 64 位的，那么它会被定义为 30，机器是 32 位的，则会被定义为 15。而现在的机器基本都是 64 位的，所以 PYLONG_BITS_IN_DIGIT 等于 30，因此 digit 等价于 uint32_t，即 unsigned int。 因此 ob_digit 是一个无符号 32 位整型数组，至于长度，虽然声明为 1，但其实没有限制，你可以当成任意长度的数组来用，这是 C 语言的一个常见特性。和 Go 不同，C 数组的长度不属于类型信息。至于数组具体多长，取决于存储的整数有多大，显然整数越大，这个数组就越长，占用的空间也就越大。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数的底层结构","id":"66","title":"整数的底层结构"},"67":{"body":"了解了 ob_digit 数组之后，来分析一下它是怎么存储整数的？ 首先抛出一个问题，如果你是 Python 的设计者，要保证整数不会溢出，你会怎么办？我们不妨再把问题简化一下，假设有一个 8 位无符号整数类型，我们知道它能表示的最大数字是 255，但这时候如果要表示 256，该怎么办呢？ 可能有人会想，那用两个数来存储不就好了，一个存储 255，一个存储 1，然后将这两个数放在数组里面。这个答案虽然有些接近，但其实还有偏差：就是我们并不能简单地按照大小拆分，比如 256 拆分成 255 和 1，要是 265 就拆分成 255 和 10，不能这样拆分，而是要通过二进制的方式，也就是用新的整数来模拟更高的位。 如果感到困惑的话没有关系，我们以 Python 整数的底层存储为例，来详细解释一下这个过程。解释器实现整数也是通过我们上面说的这种方式，但考虑的会更加全面一些。 整数 0 注意：当表示的整数为 0 时，ob_digit 数组为空，不存储任何值。而 ob_size 为 0，表示这个整数的值为 0，这是一种特殊情况。 整数 1 整数 -1 我们看到 ob_digit 数组没有变化，但是 ob_size 变成了 -1。没错，整数的正负是通过 ob_size 决定的，ob_digit 存储的其实是绝对值。无论整数 n 是多少，-n 和 n 对应的 ob_digit 是完全一致的，但是 ob_size 则互为相反数。所以 ob_size 除了表示数组的长度之外，还可以表示对应整数的正负。 因此我们之前说整数越大，底层的 ob_digit 数组就越长。更准确地说是绝对值越大，底层数组就越长。所以 Python 在比较两个整数的大小时，会先比较 ob_size，如果 ob_size 不一样则可以直接比较出大小。显然 ob_size 越大，对应的整数越大，不管 ob_size 是正是负，都符合这个结论。 整数 2 ** 30 - 1 如果想表示 2 ** 30 - 1，那么也可以使用一个 digit 表示。话虽如此，但为什么突然说这个数字呢？答案是：虽然 digit 是 4 字节、32 位，但解释器只用 30 个位。 之所以这么做是和加法进位有关系，如果 32 个位全部用来存储其绝对值，那么相加产生进位的时候，可能会溢出。比如 2 ** 32 - 1，此时 32 个位全部占满了，即便它只加上 1，也会溢出。那么为了解决这个问题，就需要先强制转换为 64 位整数再进行运算，从而会影响效率。但如果只用 30 个位的话，那么加法是不会溢出的。 因为 30 个位最大就是 2 ** 30 - 1，即便两个这样的数相加，结果也是 2 ** 31 - 2。而 32 个位最大能表示 2 ** 32 - 1，所以肯定不会溢出的。如果一开始 30 个位就存不下，那么数组中会有两个 digit。 所以虽然将 32 位全部用完，可以只用一个 digit 表示更大的整数，但会面临相加之后一个 digit 存不下的情况，于是只用 30 个位。如果数值大到 30 个位存不下的话，那么就会多使用一个 digit。 这里可能有人发现了，如果使用 31 个位的话，那么相加产生的最大值就是 2 ** 32 - 2，依旧可以使用一个 32 位整型存储啊，那 Python 为啥要牺牲两个位呢？答案是为了乘法运算。 为了方便计算乘法，需要多保留 1 位用于计算溢出。这样当两个整数相乘的时候，可以直接按 digit 计算，并且由于兼顾了\"溢出位\"，可以把结果直接保存在一个寄存器中，以获得最佳性能。 具体细节就不探究了，只需要知道整数在底层是使用 unsigned int 类型的数组来维护具体的值即可，并且虽然该类型的整数有 32 个位，但解释器只用 30 个位。 然后还记得我们在看 digit 类型的时候，说过一个宏吗？PYLONG_BITS_IN_DIGIT，在 64 位机器上等于 30，在 32 位机器上等于 15。相信这个宏表示的是啥你已经清楚了，它代表的就是使用的 digit 的位数。 整数 2 ** 30 问题来了，我们说 digit 只用 30 个位，所以 2 ** 30 - 1 是一个 digit 能存储的最大值。而现在是 2 ** 30，所以数组中就要有两个 digit 了。 我们看到此时就用两个 digit 来存储了，然后数组里面的元素是 0 和 1，而且充当高位的放在后面，因为是使用新的 digit 来模拟更高的位。由于一个 digit 只用 30 位，那么数组中第一个 digit 的最低位就是 1，第二个 digit 的最低位就是 31，第三个 digit 的最低位就是 61，以此类推。 所以如果 ob_digit 为 [a, b, c]，那么对应的整数就等于： 如果 ob_digit 不止 3 个，那么就按照 30 个位往上加，比如 ob_digit 还有第四个元素 d，那么就再加上 d * 2 ** 90 即可。 以上就是 Python 整数的存储奥秘，说白了就是串联多个小整数来表达大整数。并且这些小整数之间的串联方式并不是简单的相加，而是将各自的位组合起来，共同形成一个具有更高位的大整数，比如将两个 32 位整数串联起来，表示 64 位整数。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 探究整数的秘密","id":"67","title":"探究整数的秘密"},"68":{"body":"下面我们再分析一下，一个整数要占用多大的内存。 相信所有人都知道可以使用 sys.getsizeof 计算内存大小，但是这大小到底是怎么来的，估计会一头雾水。因为 Python 中对象的大小，是根据底层的结构体计算出来的。 由于 ob_refcnt、ob_type、ob_size 这三个是整数所必备的，它们都是 8 字节，加起来 24 字节，所以任何一个整数所占内存都至少 24 字节。至于具体占多少，则取决于 ob_digit 里面的元素有多少个。 因此整数所占内存等于 24 + 4 * ob_size的绝对值。 import sys # 如果是 0 的话，ob_digit 数组为空，所以大小就是 24 字节\nprint(sys.getsizeof(0)) # 24 # 如果是 1 的话，ob_digit 数组有一个元素，所以大小是 24 + 4 = 28 字节\nprint(sys.getsizeof(1)) # 28\n# 同理\nprint(sys.getsizeof(2 ** 30 - 1)) # 28 # 一个 digit 只用 30 位，所以最大能表示 2 ** 30 - 1\n# 如果是 2 ** 30，那么就需要两个元素，所以大小是 24 + 4 * 2 = 32 字节\nprint(sys.getsizeof(2 ** 30)) # 32\nprint(sys.getsizeof(2 ** 60 - 1)) # 32 # 如果是两个 digit，那么能表示的最大整数就是 2 ** 60 - 1\n# 因此 2 ** 60 需要三个 digit，所以大小是 24 + 4 * 3 = 36 字节\nprint(sys.getsizeof(1 << 60)) # 36\nprint(sys.getsizeof((1 << 90) - 1)) # 36 print(sys.getsizeof(1 << 90)) # 40 所以整数的大小就是这么计算的，当然不光整数，其它的对象也是如此，计算的都是底层结构体的大小。 另外我们也可以反推一下，如果有一个整数 88888888888，那么它对应的底层数组 ob_digit 有几个元素呢？每个元素的值又是多少呢？下面来分析一波。 import numpy as np # 假设占了 n 个位\n# 由于 n 个位能表达的最大整数是 2 ** n - 1\na = 88888888888\n# 所以只需获取以 2 为底、a + 1 的对数，即可算出 n 的大小\nprint(np.log2(a + 1)) # 36.371284042320475 计算结果表明，如果想要存下这个整数，那么至少需要 37 个位。而 1 个 digit 用 30 个位，很明显需要两个 digit。 # 如果 ob_digit 有两个元素\n# 那么对应的整数就等于 ob_digit[0] + ob_digit[1] * 2 ** 30\na = 88888888888\nprint(a // 2 ** 30) # 82\nprint(a - 82 * 2 ** 30) # 842059320 所以整数 88888888888 在底层对应的 ob_digit 数组为 [842059320, 82]，下面修改解释器，来验证这一结论。 我们看到结果和我们分析的是一样的，但这种办法有点麻烦，我们可以通过之前说的 ctypes 来构造底层的结构体，在 Python 的层面模拟 C 的行为。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 2) ] a = 88888888888\n# 基于对象的地址构造 PyLongObject 对象\nlong_obj = PyLongObject.from_address(id(a))\n# 打印结果和我们预期的一样\nprint(long_obj.ob_digit[0]) # 842059320\nprint(long_obj.ob_digit[1]) # 82 # 如果将 ob_digit[1] 改成 28，那么 a 会变成多少呢？\n# 很简单，算一下就知道了\nlong_obj.ob_digit[1] = 28\nprint(842059320 + 28 * 2 ** 30) # 30906830392\n# 那么 a 会不会也打印这个结果呢？毫无疑问，肯定会的\nprint(a) # 30906830392 # 并且前后 a 保存的地址没有发生改变，因为我们修改的是底层数组\n# 因此所谓的可变和不可变，都只是根据 Python 的表现抽象出来的\n# 或者说，对象是否可变，取决于解释器有没有将修改对象的接口暴露出来\n# 要是解释器没有提供修改对象的接口，那么对象就是不可变的\n# 但如果站在解释器的层面上看，则没啥可变或不可变，一切都由我们决定 通过打印 ob_digit 存储的值，我们验证了得出的结论，原来 Python 是通过数组来存储整数，并且数组的类型虽然是无符号 32 位整数，但是只用 30 个位。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 整数占的内存大小是怎么计算的","id":"68","title":"整数占的内存大小是怎么计算的"},"69":{"body":"以上我们就探究了 Python 整数的秘密，它是怎么实现的。不过还没有结束，后续还要继续分析小整数对象池，以及整数的行为。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"16. Python 的整数是怎么设计的，为什么它不会溢出？ » 小结","id":"69","title":"小结"},"7":{"body":"当提到类型时，这个类型指的是变量的类型还是对象的类型呢？不用想，肯定是对象的类型。因为 Python 的变量是个指针，操作指针会自动操作它指向的内存，所以使用 type(a) 查看的其实是变量 a 指向的对象的类型。 那么问题来了，我们在创建变量的时候，并没有显式地指定类型啊，那么解释器是如何判断一个变量指向什么类型的数据呢？答案是：解释器是通过靠猜的方式，通过赋的值（或者说变量引用的值）来推断类型。 因此在 Python 中，如果你想创建一个变量，那么必须在创建变量的时候同时赋值，否则解释器就不知道这个变量指向的数据是什么类型。所以 Python 是先创建相应的值，这个值在 C 中对应一个结构体，结构体里面有一个字段专门用来记录该值对应的类型，因此在 Python 中，类型是和对象绑定的，而不是和变量。当创建完值之后，再让这个变量指向它，所以 Python 中是先有值后有变量。 但在 C 里面显然不是这样的，因为 C 的变量代表的内存所存储的就是具体的值，所以在 C 里面可以直接声明一个变量的同时不赋值。因为 C 要求声明变量时必须指定类型，所以变量声明之后，其类型和内存大小就已经固定了。 而 Python 的变量存的是个地址，它只是指向了某个对象，所以由于其便利贴的特性，可以贴在任意对象上面。但是不管贴在哪个对象，都必须先有对象才可以，不然变量贴谁去。 另外，尽管 Python 在创建变量的时候不需要指定类型，但 Python 是强类型语言，而且是动态强类型。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 变量有类型吗？","id":"7","title":"变量有类型吗？"},"70":{"body":"之前分析过浮点数的创建，而整数的创建与之是类似的，都是基于字面量形式的 C 数据创建 Python 数据。 创建浮点数可以使用 PyFloat_FromDouble、PyFloat_FromString 等； 创建整数可以使用 PyLong_FromLong、PyLong_FromDouble、PyLong_FromString 等； 创建整数的这些函数直接去 Objects/longobject.c 里面查看即可，这里就不多说了，我们重点来看一下小整数对象池。 我们知道整数属于不可变对象，运算之后会创建新的对象。 >>> a = 666\n>>> id(a)\n140078521506224\n>>> a += 1\n>>> id(a)\n140078521506096\n>>> 显然这种做法一定存在性能缺陷，因为程序运行时会有大量的对象创建和销毁。根据浮点数的经验，我们猜测 Python 应该也对整数使用了缓存池吧。答案是差不多，只不过不是缓存池，而是小整数对象池。 一些使用频率高的整数在创建之后，会被保存在一个静态数组里面，我们称之为小整数对象池。 看一下小整数对象池的实现。 // Objects/longobject.c #define NSMALLPOSINTS 257\n#define NSMALLNEGINTS 5 static PyLongObject small_ints[NSMALLNEGINTS + NSMALLPOSINTS]; 数组 small_ints 便是小整数对象池，它是一个类型为 PyLongObject、长度为 262 的数组，里面缓存了 -5 到 256 之间的整数。当然这只是解释器的默认行为，因为 -5 到 256 之间的整数使用频率最高，但你也可以根据自身情况修改源码，让它缓存更多的整数，以提升效率，当然这也会额外占用一些内存。 小整数对象池是预先创建好的，里面的整数全局唯一，我们来验证一下。 >>> n1 = 256\n>>> n2 = 256\n>>> id(n1), id(n2)\n(140078528922016, 140078528922016)\n>>> >>> n1 = 257\n>>> n2 = 257\n>>> id(n1), id(n2)\n(140078521507472, 140078521506704)\n>>> 256 位于小整数对象池内，所以全局唯一，需要使用的话直接去取即可，因此它们的地址是一样的。但 257 不在小整数对象池内，所以它们的地址不一样。 另外上面的代码是交互式执行的，但如果有小伙伴不是通过交互式，那么打印地址的时候会得到出乎意料的结果。 a = 257\nb = 257\nprint(id(a) == id(b)) # True 可能有人会好奇，为什么地址又是一样的了，257 明明不在小整数对象池中啊。虽然涉及到了后面的内容，但提前解释一下也是可以的。主要区别就在于一个是交互式执行的，另一个是通过 python3 xxx.py 的方式执行的。 首先 Python 的编译单元是函数，每个函数都有自己的作用域，在这个作用域中出现的所有常量都是唯一的，并且都位于常量池中，由 co_consts 指向。虽然上面的对象不在函数中，而是在全局作用域中，但全局也可以看成是一个函数，它也是一个独立的编译单元。同一个编译单元中，相同的常量只会出现一次。 当执行 a = 257 的时候，会创建 257 这个整数，并放入常量池中。所以 b = 257 的时候就不会再创建了，因为常量池中已经有了，所以会直接从常量池中获取，因此它们的地址是一样的，因为是同一个 PyLongObject。 而对于交互式环境来说，因为输入一行代码就会立即执行一行，所以任何一行可独立执行的代码都是一个独立的编译单元。注意：是可独立执行的代码，比如变量赋值、函数、方法调用等等。但如果是 if、for、while、def 等需要多行表示的逻辑，比如 if 2 > 1:，显然就不是一行可独立执行的代码，它还依赖你输入的下面的内容。 # 此时按下回车，我们看到不再是 >>>，而是 ...\n# 这代表还没有结束，还需要你输入下面的内容\n>>> if 2 > 1:\n... print(\"2 > 1\")\n... # 此时这个 if 语句整体才是一个独立的编译单元\n2 > 1\n>>> 但是像 a = 1、foo()、lst.appned(123) 这些显然是一行可独立执行的代码，因此在交互式中它们是独立的编译单元。 # 此时这行代码已经执行了，它是一个独立的编译单元\n>>> a = 257\n# 这行代码也是独立的编译单元，所以它里面的常量池为空，因此要重新创建 257\n>>> b = 257\n# 由于它们是不同常量池内的整数，所以 id 是不一样的\n>>> id(a), id(b)\n(140078521506768, 140078521506096) 再来看个例子。 >>> a = 666; b = 666\n>>> id(a), id(b)\n(140078521506512, 140078521506512)\n>>>\n>>> a, b = 777, 777\n>>> id(a), id(b)\n(140078521506224, 140078521506224) 666 和 777 明显不在常量池中，为啥 a 和 b 指向对象的地址是一样的呢？相信你能猜到原因，因为上面两种方式无论哪一种，都是在同一行，因此整体会作为一个编译单元。既然是同一个编译单元，那么常量池里面的每个常量只会创建一次，所以地址是一样的。 注意：常量池里面的常量一定在编译期间就可以确定，比如整数、浮点数、字符串等等，解释器在编译期间会静态收集起来，保存在常量池中。但如果编译期间无法确定，就不会静态收集了，举个例子。 >>> a, b = int(\"257\"), int(\"257\")\n>>> id(a), id(b)\n(140078521506768, 140078521506512)\n>>> >>> a, b = int(\"123\"), int(\"123\")\n>>> id(a), id(b)\n(140078528917760, 140078528917760)\n>>> >>> a, b = 258, 258\n>>> id(a), id(b)\n(140078521507632, 140078521507632) int(\"257\") 需要在运行时执行，因此会创建两个 257，然后赋值给 a 和 b，所以地址不一样。 int(\"123\") 虽然也在运行时执行，但解释器创建完之后发现 123 位于小整数对象池中，于是会直接从池子里面取，所以打印的地址一样。注意：int(\"123\") 肯定是会执行的，只是执行之后发现结果存在于小整数对象池中，会再将创建的对象销毁。 258 属于编译期间可以静态收集的常量，会被保存在常量池中，而常量池里的常量只会出现一次，所以打印的地址一样。 ⭐️：常量不仅仅是 123、\"hello\" 这种，像 2 ** 10、\"AAA\" + \"BBB\" 这种也属于常量，它们在编译之后会被替换为 1024、\"AAABBB\"，这个过程被称为常量折叠。 以上就是小整数对象池相关的内容，比较简单，因为小整数对象池就是一个数组，里面缓存了 -5 到 256 之间的 Python 整数，而这些整数可以直接拿来用。 下一篇文章我们来分析整数的运算，这也是最关键的地方。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"17. 解密 Python 的小整数对象池","id":"70","title":"17. 解密 Python 的小整数对象池"},"71":{"body":"通过考察整数的底层实现，我们明白了它能够保证不溢出的缘由。整数的值在底层是由 C 数组来维护的，通过组合多个 digit（uint32_t）来实现大整数的存储。这么做的好处就是 Python 整数没有大小限制了，因此不会溢出，而不会溢出是因为数组没有长度限制，所以只要你的内存足够，就可以存任意大的数。 Python 表示：存不下？会溢出？这都不是事儿，直接继续往数组里面塞 digit 就 ok 了。另外数组存的是绝对值，符号是通过 ob_size 体现的。 不过说实话，用数组实现大整数的做法非常普遍，并没有什么神秘的，就是将多个整数组合起来，模拟具有更高位的大整数。但这种实现方式的难点在于大整数的数学运算，它们才是重点，实现的时候比较考验编程技巧以及思维逻辑。 因此 Python 的整数比浮点数要复杂的多，浮点数在底层直接用 C 的 double 来维护具体的值，因此运算的话，比如相加，直接转成 C 的 double 做加法即可。但整数就不行了，在底层不能简单地将数组相加。 下面来看看具体实现。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 楔子","id":"71","title":"楔子"},"72":{"body":"先来看看整数的大小比较，由于整数具体的值是通过数组维护的，显然数组越长，整数的绝对值就越大，这是毫无疑问的。至于整数的正负，则由 ob_size 来体现。 因此可以得出一个结论：当两个整数在比大小时，可以先比较各自的 ob_size，如果 ob_size 不一样，可以直接比较出大小，并且 ob_size 越大，对应的整数越大。但如果两个整数的 ob_size 一样，那么就从数组 ob_digit 的尾部元素开始，不断向前进行比较。只要两个整数的 ob_digit 中有一个对应元素不相同，那么就可以比较出大小。 之所以从数组的尾部开始，是因为数组元素的索引越大，那么充当的位数就越高，而在比较的时候显然要从高位开始比。 # ob_digit = [892311, 32, 3]\na = 3458764548181171607\n# ob_digit = [2296, 31, 3]\nb = 3458764547106539768 我们以 a 和 b 为例，显然 a 大于 b，那么在底层，它们是如何比较的呢？ 如果 ob_size 不相等，那么可以直接比较出大小。但这里两个整数的 ob_size 是相等的，所以需要比较 ob_digit，并且是从后往前比。具体做法就是让索引从 ob_digit 长度减 1 开始，依次往前遍历。 因为 a->ob_digit[2] 等于 b->ob_digit[2]，此时无法比较出大小，因此索引减一，比较上一个元素。 因为 a->ob_digit[1] 大于 b->ob_digit[1]，所以成功比较出大小，可以得出 |a| 大于 |b|。 当然啦，由于数组反映的是绝对值的大小，所以还需要判断符号。 如果是正数，那么和绝对值相同。 但如果是负数，那么绝对值越大，对应的整数反而越小，因此比较之后的结果还要再乘上 -1。 from ctypes import * class PyLongObject(Structure): _fields_ = [ (\"ob_refcnt\", c_ssize_t), (\"ob_type\", c_void_p), (\"ob_size\", c_ssize_t), (\"ob_digit\", c_uint32 * 3) ] a = 3458764548181171607\nb = 3458764547106539768\nlong_obj1 = PyLongObject.from_address(id(a))\nlong_obj2 = PyLongObject.from_address(id(b))\nprint(list(long_obj1.ob_digit)) # [892311, 32, 3]\nprint(list(long_obj2.ob_digit)) # [2296, 31, 3] 以上就是整数的大小比较逻辑，下面再看一下具体的源码实现。 int 类型对象的 tp_richcompare 字段的值为 long_richcompare，所以具体的比较逻辑便由该函数负责实现。 // Objects/longobject.c static PyObject *\nlong_richcompare(PyObject *self, PyObject *other, int op)\n{ // 比较结果 int result; // 类型检测，确保 self 和 other 的类型都是整数 CHECK_BINOP(self, other); // self 和 other 都是泛型指针 PyObject * // 如果 self == other，说明指针保存的地址相同，它们指向的是同一个对象 // 因此可以直接判定两者相等 if (self == other) result = 0; else // 否则调用 long_compare，将对象维护的 ob_digit 抽出来，挨个比较 // 如果 self > other，那么 result 为 1 // 如果 self == other，那么 result 为 0 // 如果 self < other，那么 result 为 -1 result = long_compare((PyLongObject*)self, (PyLongObject*)other); // 一会儿解释 Py_RETURN_RICHCOMPARE(result, 0, op);\n} 在 Python 中不同的算术操作符会对应不同的魔法方法，而在 C 中均由 long_richcompare 函数实现。 而在 long_richcompare 里面，不管操作符是什么，result 都是固定的。 如果 self > other，那么 result 为 1； 如果 self == other，那么 result 为 0； 如果 self < other，那么 result 为 -1； 不管我们传入的操作符 op 是什么，都不影响上面的结论，因为 result 只是表达了 self 和 other 之间的关系。然后再看一下结尾的 Py_RETURN_RICHCOMPARE 这个宏，它的定义如下。 // Include/object.h\n#define Py_RETURN_RICHCOMPARE(val1, val2, op) \\ do { \\ switch (op) { \\ case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE; \\ default: \\ Py_UNREACHABLE(); \\ } \\ } while (0) 这个宏做的事情很简单，就是基于操作符比较 val1 和 val2，如果 if 条件成立，返回 Python 的 True，否则返回 Python 的 False。而在 long_richcompare 里面，最后调用这个宏的时候，给 val1、val2 传的是 result 和 0。注意：这一步稍微有点绕，我们举个例子就简单了。 假设 self = 5，other = 6，我们要判断 self > other 是 True 还是 False。 首先 self 小于 other，因此在 long_richcompare 里面比较之后，result 会等于 -1。那么调用宏的时候，传的三个参数就是 -1、0、Py_GT。然后执行对应分支，发现 val1 > val2 不成立，于是返回 False，因此 self > other 的结果也是 False。 所以 long_richcompare 里面的 result 只是通过 1、0、-1 描述了 self 和 other 之间的关系（C 语言的特点之一），而判断 self > other 最终等价于判断 result > 0，同理其它操作符也是如此。 再举个例子，假设要判断 self <= other，那么最终等价于判断 result <= 0。 如果 self > other，那么 result 就是 1，而 1 <= 0 不成立，所以 self <= other 就是 False。 如果 self == other，那么 result 就是 0，而 0 <= 0 成立，所以 self <= other 就是 True。 如果 self < other，那么 result 就是 -1，而 -1 <= 0 成立，所以 self <= other 就是 True。 因此最后这一步还是很巧妙的，但也稍微有一点绕。估计有人会好奇，为啥不能像浮点数那样直接比较呢？其实原因很好想，因为浮点数在底层使用 double 类型的字段来维护具体的值，比较逻辑非常简单。但整数不同，由于整数的值是通过数组维护的，比较起来非常复杂，如果还按照上面那种做法，那么每个分支里面会存在大量重复代码。 所以整数在比较的时候，先不管指定的操作符是什么，而是先判断两个数的大小关系。如果两个数是大于关系，那么给 result 赋值为 1；等于关系，赋值为 0；小于关系，赋值为 1。 最后将两个整数的比较操作，转成 result 和 0 的比较操作，这个实现思路非常巧妙，你在工作中也可以用起来。 但是还没结束，我们还有最关键的一步没有看。 显然这最关键的一步就在 long_compare 身上，它负责具体的比较逻辑。 // Objects/longobject.c static int\nlong_compare(PyLongObject *a, PyLongObject *b)\n{ Py_ssize_t sign; // 如果两个整数的 ob_size 不一样，那么直接可以比较出大小 if (Py_SIZE(a) != Py_SIZE(b)) { sign = Py_SIZE(a) - Py_SIZE(b); } else { // 否则说明 ob_size 一样，那么获取 ob_size 的绝对值，即数组 ob_digit 的长度 Py_ssize_t i = Py_ABS(Py_SIZE(a)); // 从后往前依次比较数组元素的大小 while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果两个数组的元素全部一样，那么 i 最终会等于 -1 if (i < 0) sign = 0; // 否则说明两个数组中索引为 i 的元素存在不同 else { // 那么比较大小 sign = (sdigit)a->ob_digit[i] - (sdigit)b->ob_digit[i]; // 如果 ob_size < 0，说明是负数，那么比较结果还要再乘上 -1 if (Py_SIZE(a) < 0) sign = -sign; } } // 如果 a < b，那么 sign < 0，直接返回 -1 // 如果 a == b，那么 sign == 0，直接返回 0 // 如果 a > b，那么 sign > 0，直接返回 1 return sign < 0 ? -1 : sign > 0 ? 1 : 0;\n} 以上就是 Python 整数的比较逻辑，所以一个简单的整数比较，Python 底层居然做了这么多工作。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 整数的大小比较","id":"72","title":"整数的大小比较"},"73":{"body":"以上就是整数的比较逻辑，所以用数组实现大整数的思路没什么特别的，但难点就在于运算。而为了方便大家理解和消化，本篇文章暂时只介绍比较操作，下一篇文章来介绍整数的运算。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"18. 两个 Python 整数之间是如何进行大小比较的？过程并不像我们想的那样简单 » 小结","id":"73","title":"小结"},"74":{"body":"本篇文章来探讨一下整数的加减法是怎么做的，因为整数在底层采用数组进行存储，所以它的加减法就不像浮点数那么简单。 在介绍浮点数的时候说过，对于数值型对象，它的类型一定实现了 tp_as_number 字段，该字段指向了 PyNumberMethods 结构体实例。结构体里面的每个字段都是一个函数指针，对应数值型对象的一个操作。 比如 nb_add 负责加法操作，nb_substract 负责减法操作等等，本篇文章就来探讨一下。首先整数支持的操作非常多，这里我们只探讨加减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 楔子","id":"74","title":"楔子"},"75":{"body":"整数的加法和减法分别由 long_add 和 long_sub 实现，但运算的核心却不在这两个函数上，它们内部会调用另外两个函数。因为数组保存了整数的绝对值，所以 Python 将整数的运算转成了绝对值运算，而底层有两个函数专门用来做这件事情，分别是 x_add 和 x_sub。 x_add(a, b)：计算 a 和 b 的绝对值之和； x_sub(a, b)：计算 a 和 b 的绝对值之差； 所以整数相加就可以这么做，假设两个整数 a 和 b 相加： 如果 a 和 b 均为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 如果 a 和 b 均为负数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 而整数相减也是同理，还是整数 a 和 b，两者相减： 如果 a 为正数，b 为负数，那么通过 x_add 计算两者的绝对值之和即可； 如果 a 为负数，b 为正数，那么通过 x_add 计算两者的绝对值之和，然后再取相反数； 如果 a 和 b 均为正数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果 a 和 b 均为负数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 相加时，符号相同会调用 x_add、符号不同会调用 x_sub。相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 所以这就是 Python 的设计，因为绝对值的加减法不用考虑符号的影响，实现更为简单，所以 Python 将整数运算转化成整数的绝对值运算。那么下面我们的重心就在 x_add 和 x_sub 上面了，看看它们是如何对大整数绝对值进行运算的。到这里你可能会有疑问，大整数运算这么复杂，效率会差吧。显然这是啃腚的，整数数值越大，整数对象的底层数组就越长，运算开销也就越大。 但 Python 底层有一个机制叫做快分支，因为通用逻辑能处理所有情况，那么它的效率必然不高。而快分支则是对那些可以简单运算的情况提前进行处理，比如在对 a 和 b 计算加减法的时候，底层会先判断数组的长度是否均小于等于 1，如果是则说明数组中最多只有一个元素。这样的话，就可以直接转成 C 的整数进行运算了，这样性能损耗就可以忽略不计。 关于快分支，需要再单独解释一下。我们举个生活中的例子：好比你去见女朋友，正常情况下，你需要买花，并且精心打扮。但如果女朋友不在生理期，那么这一切都不需要做，只需买杯奶茶就好了。所以先判断女朋友是否在生理期，如果不在，那么只需买杯奶茶就能牵手便属于快分支。快分支具有命中率高等特点，绝大部分都是这个情况，而一旦命中快分支，那么程序便可快速处理。 回到上面的例子，只要整数不超过 2 ** 30 - 1，都可以走快分支，显然这可以满足绝大部分场景，因为这个数字已经很大了。至于 x_add 和 x_sub 则属于通用逻辑，而通用也意味着平庸，但如果快分支没有命中，那么就只能走通用逻辑了。 而我们的重点就是要研究 x_add 和 x_sub 的实现，感受大整数运算的魅力。不过在介绍之前，不妨想象一下我们平时将两个整数相加的时候是怎么做的。 从最低位开始进行相加，逢十进一，ob_digit 也是同理。我们可以把数组中的每一个元素看成是一个整体，只不过它不再是逢十进一，而是逢 2 ** 30 进一。 # 数组的每个元素最大能表示 2 ** 30 - 1\n# 把元素整体想象成我们生活中加法的个位、十位、百位...\n# 然后对应的位相加，逢 2 ** 30 进一\na = [1024, 22]\nb = [342, 18]\nc = [1024 + 342, 22 + 18] # [1366, 40] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 所以仍旧是对应的位进行相加，和我们生活中的加法并无本质上的区别。只不过生活中的加法，每一位能表示 0~9，逢十进一。而 Python 底层的加法，因为整数使用数组存储，那么每一个位能表示 0 ~ 2 ** 30 - 1，逢 2 ** 30 进一。 把 1024、342 想象成个位，把 22、18 想象成十位，并且此时不再是逢十进一，而是逢 2 ** 30 进一。 a = [2 ** 30 - 1, 16]\nb = [2 ** 30 - 1, 21]\n# a[0] + b[0] 超过了 2 ** 30，要进个 1\n# 而逢十进一之后，该位要减去十\n# 那么逢 2 ** 30 进一之后，显然要减去 2 ** 30\nc = [ a[0] + b[0] - 2 ** 30, a[1] + b[1] + 1\n] print( a[0] + a[1] * 2 ** 30 + b[0] + b[1] * 2 ** 30 == c[0] + c[1] * 2 ** 30\n) # True 然后是绝对值减法，和绝对值加法一样，也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，由于 7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 18。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]\n# 所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 然后是 a[1] - b[1]\n# 由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 结果没有问题，以上我们就从原理上介绍了大整数的加减法，下面再看一下源码实现。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法的运算原理","id":"75","title":"整数加减法的运算原理"},"76":{"body":"当整数相加时会执行 long_add 函数，看一下它的具体实现。 // Objects/longobject.c\nstatic PyObject *\nlong_add(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 // 由于 2 ** 30 - 1 已经很大了，所以绝大部分场景，都会执行此分支 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { // MEDIUM_VALUE 是一个宏，接收一个 abs(ob_size) <= 1 的 PyLongObject * // 如果 ob_size 等于 0, 那么返回 0 // 如果 ob_size 等于 1, 那么返回 ob_digit[0] // 如果 ob_size 等于 -1, 那么返回 -ob_digit[0] // 所以计算出 MEDIUM_VALUE(a) + MEDIUM_VALUE(b) 之后 // 将结果转成 PyLongObject，然后返回其泛型指针即可 // 因此当数组中元素个数不超过 1 的时候，显然是可以直接相加的 return PyLong_FromLong(MEDIUM_VALUE(a) + MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| + |b| if (Py_SIZE(b) < 0) { z = x_add(a, b); if (z != NULL) { // 然后对 z 取相反数 assert(Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } // 如果 a 是负数、b 是正数，那么计算 |b| - |a| else z = x_sub(b, a); } else { // 如果 a 是正数、b 是负数，那么计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| + |b| else z = x_add(a, b); } return (PyObject *)z;\n} 因此 long_add 函数并不长，但是调用了 x_add 和 x_sub，显然核心逻辑是在这两个函数里面。至于 long_add 函数，它的逻辑如下： 判断两个整数底层对应的数组的长度是否均小于等于 1，如果是的话那么通过宏 MEDIUM_VALUE 直接将其转成 C 的一个 digit，当然符号也会考虑在内。然后直接相加、返回即可。显然这里走的是快分支，或者说快速通道。 但如果其中一方的数组长度（ob_size）大于 1，那么判断两者的符号。如果都为负数，那么通过 x_add 计算两者的绝对值之和，然后取相反数。 如果 a 为负数，b 为正数，那么通过 x_sub 计算 b 和 a 的绝对值之差即可； 如果 a 为正数，b 为负数，那么通过 x_sub 计算 a 和 b 的绝对值之差即可； 如果都为正数，那么通过 x_add 计算 a 和 b 的绝对值之和即可； 所以 Python 整数设计的非常巧妙，ob_digit 虽然用来维护具体数值，但它并没有考虑正负，整数的正负是通过 ob_size 来表示的。通过将运算变成绝对值运算，实现起来会方便很多。 说完了 long_add，再来看看 long_sub，这两者是类似的。 // Objects/longobject.c\nstatic PyObject *\nlong_sub(PyLongObject *a, PyLongObject *b)\n{ PyLongObject *z; // 指向运算后的整数 CHECK_BINOP(a, b); // 确保 a 和 b 都指向整数 // 如果两个整数的 ob_digit 数组最多只有一个元素 // 那么取出来判断正负之后，直接进行运算即可 if (Py_ABS(Py_SIZE(a)) <= 1 && Py_ABS(Py_SIZE(b)) <= 1) { return PyLong_FromLong(MEDIUM_VALUE(a) - MEDIUM_VALUE(b)); } // 否则走通用分支 if (Py_SIZE(a) < 0) { // 如果 a 是负数、b 是负数，那么先计算 |a| - |b| if (Py_SIZE(b) < 0) z = x_sub(a, b); // 如果 a 是负数、b 是正数，那么先计算 |a| + |b| else z = x_add(a, b); // 然后对 z 取相反数 if (z != NULL) { assert(Py_SIZE(z) == 0 || Py_REFCNT(z) == 1); Py_SIZE(z) = -(Py_SIZE(z)); } } else { // 如果 a 是正数、b 是负数，那么计算 |a| + |b| if (Py_SIZE(b) < 0) z = x_add(a, b); // 如果 a 是正数、b 是正数，那么计算 |a| - |b| else z = x_sub(a, b); } return (PyObject *)z;\n} 所以 long_add 和 long_sub 的代码是类似的，它们将整数的运算转成了整数的绝对值运算，所以关键要理解什么时候用 x_add，什么时候用 x_sub。 a + b 如果 a 是正数，b 是正数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数、b 是负数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数、b 是正数，调用 x_sub(b, a)，计算 |b| - |a|； 所以相加时，符号相同会调用 x_add、符号不同会调用 x_sub。 a - b 如果 a 是正数、b 是负数，调用 x_add(a, b)，计算 |a| + |b|； 如果 a 是负数、b 是正数，调用 x_add(a, b)，计算 |a| + |b|，然后再取反； 如果 a 是正数，b 是正数，调用 x_sub(a, b)，计算 |a| - |b|； 如果 a 是负数，b 是负数，调用 x_sub(b, a)，计算 |b| - |a|。当然在源码中调用的是 x_sub(a, b)，计算 |a| - |b|，然后再取相反数； 所以相减时，符号相同会调用 x_sub、符号不同会调用 x_add。 接下来我们的重点就是绝对值加法和绝对值减法的具体实现细节。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 整数加减法源码实现","id":"76","title":"整数加减法源码实现"},"77":{"body":"函数 x_add 负责绝对值加法，但是介绍之前，需要先了解几个宏，它们在 x_add 中会有体现。 // Include/longintrepr.h\n#define PyLong_SHIFT 30\n#define PyLong_BASE ((digit)1 << PyLong_SHIFT)\n#define PyLong_MASK ((digit)(PyLong_BASE - 1)) 显然 PyLong_BASE 等于 2 ** 30，PyLong_MASK 等于 2 ** 30 - 1（说明 32 个位，前两个位是 0，后三十个位都是 1）。 然后我们可以看 x_add 的具体实现了。 // Objects/longobject.c static PyLongObject *\nx_add(PyLongObject *a, PyLongObject *b)\n{ // 参数 a 和 b 指向了两个要相加的整数对象 // 获取整数在底层的 ob_size Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // 指向两个整数的相加结果 PyLongObject *z; // 循环变量 Py_ssize_t i; // 每个部分的运算结果 digit carry = 0; // 如果 size_a 小于 size_b，说明 |a| < |b| // 那么将两个整数交换位置，确保操作符左边的数大于右边的数 // 这么做也符合人类习惯，可以想象一下小学时候的加法计算 // 如果一个位数多，一个位数少，也会习惯将位数多的放在左边 if (size_a < size_b) { { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 申请一个 ob_digit 的长度为 size_a + 1 的 PyLongObject // 但为什么是 size_a + 1 呢? 由于上面的 if 语句，使得 size_a 一定不小于 size_b // 那么 a 和 b 相加之后的 z 的 ob_size 一定不小于 size_a // 但是也可能比 size_a 多 1，比如: a = 2 ** 60 - 1, b = 1 // 那么相加之后结果为 2 ** 60，于是 ob_size 就变成了 3 // 因此在创建 z 的时候，ob_digit 的容量会等于 size_a + 1 z = _PyLong_New(size_a+1); // 正常情况下, z 是一个 PyLongObject *，但如果 z == NULL, 表示分配失败（程序崩溃） // 但说实话, 除非你内存不够了, 否则这种情况不会发生 if (z == NULL) return NULL; // 重点来了，因为 size_a > size_b，所以会以 size_b 为准，两者从低位向高位依次对应相加 // 当 b 到头了，再单独算 a 的剩余部分 // 因此以 i < size_b 作为条件 for (i = 0; i < size_b; ++i) { // 将 a->ob_digit[i] + b->ob_digit[i] + carry（初始为 0）作为 carry // 如果 carry 没有超过 2 ** 30 - 1，那么它就是 z -> ob_digit[i] 的值 carry += a->ob_digit[i] + b->ob_digit[i]; // 但 carry 是可能溢出的，当溢出时，应该要减去 2 ** 30，所以还要判断是否产生了进位 // 但解释器没有使用常规的判断，而是选择了效率更高的位运算（carry & PyLong_MASK） // 由于 PyLong_MASK 等于 (1 << 30) - 1，所以它的前两个位是 0，后面三十个位全是 1 // 因此当 carry 不超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry // 当 carry 超过 2 ** 30 - 1 时，carry & PyLong_MASK 就等于 carry - 2 ** 30 z->ob_digit[i] = carry & PyLong_MASK; // 然后当 carry 产生进位时，显然不可以丢，它们要作用在数组中下一个元素相加的结果上 // 所以这里将 carry 右移 30 位，得到进位，然后重新赋值给 carry，并作用在下一轮循环中 // 如果没有产生进位，那么 carry 为 0，如果产生了进位，那么 carry 为 1 carry >>= PyLong_SHIFT; } // 如果 b 到头了, 那么继续从当前的 i 开始遍历，直到 i == size_a, 逻辑还是和上面一样 for (; i < size_a; ++i) { // 此时只需要加上 a->ob_digit[i] 和 carry 即可，因为 b 到头了 carry += a->ob_digit[i]; // 这里也要按位与 PyLong_MASK, 因为也可能存在进位的情况 // 拿生活中的 99999 + 1 为例，此时 a = 99999, b = 1，显然第一次循环 b 就到头了 // 但后面单独循环 a 的时候, 依旧会产生进位，所以这里也是同理 z->ob_digit[i] = carry & PyLong_MASK; // carry 右移 30 位得到进位，然后重新赋值给 carry carry >>= PyLong_SHIFT; } // 两个循环结束之后, 其实还差一步，还拿 99999 + 1 举例子 // 按照顺序相加得到的是 00000，因为最后还进了一个 1，这里的 carry 也是同理 // 因此 z 的 ob_size 要比 size_a 多 1，目的就在于此 // 所以要将 z->ob_digit 的最后一个元素设置成 carry z->ob_digit[i] = carry; // 但如果最后的 carry 没有进位的话，显然其结果就是 0 // 所以最后没有直接返回 z，而是返回了 long_normalize(z) // 这个 long_normalize 函数的作用是从后往前依次检查 ob_digit 的元素 // 如果为 0，那么就将其 ob_size 减去 1, 直到出现一个不为 0 的元素 // 比如 ob_digit 为 [0, 3, 1, 0, 0, 0]，长度为 6，但规范化之后的 ob_size 显然是 3 // 不过对于当前来说，显然最多只会检查一次，因为它的 ob_size 只比 size_a 多 1 // 所以判断数组最后一个元素是否为 0 也可以，如果为 0 则说明没有产生进位 return long_normalize(z);\n} 整数在底层实现的很巧妙，不理解的话可以多看几遍，然后我们在 Python 的层面上再反推一下绝对值加法，进一步感受底层的运算过程。 # 假设有 a 和 b 两个整数\n# 当然这里是使用列表直接模拟底层数组 ob_digit\na = [1073741744, 999, 765, 123341]\nb = [841, 1073741633, 2332]\n# 然后创建 z，表示 a 和 b 的相加结果\nz = [] # 为了更直观，我们一步步手动相加\n# 首先是 a[0] + b[0]，得到 carry\ncarry = a[0] + b[0]\n# 但 carry 可能大于 2 ** 30 - 1，所以要进行判断\n# 如果大于，那么要减去 2 ** 30，否则保持不变\n# 而这一步可以使用位运算来实现，将 carry 和 (2 ** 30 - 1) 按位与即可\nprint(carry & (2 ** 30 - 1)) # 761\n# 结果是 761，说明 carry 比 2 ** 30 - 1 大\n# 然后 z 的第一个元素就是 761\nz.append(761) # 接着计算 a[1] + b[1] 得到新的 carry\n# 但是之前的 carry 大于 2 ** 30 - 1，所以还要再加上 carry >> 30，即进位\n# 当然，如果没有产生进位，那么 carry >> 30 就是 0\ncarry = (carry >> 30) + a[1] + b[1]\n# 然后 carry & (2 ** 30 - 1) 得到 809，说明 carry 依旧大于 2 ** 30 - 1\nprint(carry & (2 ** 30 - 1)) # 809\n# 所以 z 的第二个元素就是 809\nz.append(809) # 计算 a[2] + b[2] 的时候也是同理\ncarry = (carry >> 30) + a[2] + b[2]\n# 但显然此时的 carry 已经不大于 2 ** 30 - 1 了\nprint(carry & (2 ** 30 - 1)) # 3098\n# 说明 z 的第三个元素是 3098\nz.append(3098) # 此时 b 到头了，所以直接将 a[3] 作为 carry\n# 当然还要判断上一步的 carry 是否大于 2 ** 30 - 1\n# 所以还是右移 30 位，当不大于 2 ** 30 - 1 时，carry >> 30 就是 0\ncarry = (carry >> 30) + a[3]\nprint(carry & (2 ** 30 - 1)) # 123341\nz.append(123341) # 此时 a 也遍历完毕，但是不要忘记再对 carry 进行判断\n# 如果大于 2 ** 30 - 1，那么会产生进位，所以 z 还要再 append 一个 1\n# 当然这里 carry 没有超过 2 ** 30 - 1 # 此时 z 为 [761, 809, 3098, 123341]\nprint(z) # [761, 809, 3098, 123341] # a = [1073741744, 999, 765, 123341]\n# b = [841, 1073741633, 2332]\n# z = [761, 809, 3098, 123341]\n# 因此 ob_digit 为 [1073741744, 999, 765, 123341]\n# 和 ob_digit 为 [841, 1073741633, 2332] 的两个 PyLongObject 相加\n# 得到的新的 PyLongObject 的 ob_digit 为 [761, 809, 3098, 123341]\nprint( a[0] + a[1] * 2 ** 30 + a[2] * 2 ** 60 + a[3] * 2 ** 90 + b[0] + b[1] * 2 ** 30 + b[2] * 2 ** 60 == z[0] + z[1] * 2 ** 30 + z[2] * 2 ** 60 + z[3] * 2 ** 90\n) # True 以上就是绝对值加法，我们从源码的角度和 Python 代码的角度分别解释了一遍。看完了绝对值加法，再来看看绝对值减法。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值加法：x_add","id":"77","title":"绝对值加法：x_add"},"78":{"body":"和绝对值加法一样，绝对值减法也可以类比生活中的减法，从低位到高位分别相减。如果某一位相减的时候发现不够了，那么要向高位借一位。比如 27 减去 9，7 比 9 小，因此向 2 借一位变成 17，减去 9，得 8。但 2 被借了一位，所以剩下 1，因此结果为 17。 // Objects/longobject.c static PyLongObject *\nx_sub(PyLongObject *a, PyLongObject *b)\n{ // 依旧是获取两者的 ob_size 的绝对值 Py_ssize_t size_a = Py_ABS(Py_SIZE(a)), size_b = Py_ABS(Py_SIZE(b)); // z 指向相加之后的 PyLongObject PyLongObject *z; // 循环变量 Py_ssize_t i; // 如果 size_a 小于 size_b，那么 sign 就是 -1，否则就是 1 int sign = 1; // 之前 carry 保存相加的结果，这里的 borrow 保存相减的结果 // 名字很形象，相加要进位叫 carry，相减要借位叫 borrow digit borrow = 0; // 接下来依旧要判断两个整数的大小，确保相减的时候，绝对值大的一方在左边 // 相加的时候，大的一方在左边还是在右边，其实没太大影响 // 而相减的时候如果大的一方在左边，显然会省事很多 // 所以如果 size_a 比 size_b 小，说明 a 的绝对值比 b 小 if (size_a < size_b) { // 那么令 sign = -1，因为 a 和 b 交换了位置，所以后续相减之后还要再乘上 sign // 因为计算的是绝对值之差，符号是在绝对值之差计算完毕之后通过 sign 判断的 sign = -1; // 交换 a 和 b 的位置 { PyLongObject *temp = a; a = b; b = temp; } { Py_ssize_t size_temp = size_a; size_a = size_b; size_b = size_temp; } } // 如果 size_a == size_b，那么需要依次比较 ob_digit 里的元素，才能判断出大小 else if (size_a == size_b) { // 所以从 ob_digit 的尾部开始遍历 i = size_a; while (--i >= 0 && a->ob_digit[i] == b->ob_digit[i]) ; // 如果所有元素都相等，那么 i 会等于 -1，相减的结果为 0，此时直接返回 0 即可 // 所以这一步也是为了能够快速返回结果，而额外做的一层判断 if (i < 0) return (PyLongObject *)PyLong_FromLong(0); // 但如果某个对应的元素不相等，那么只需判断这两者谁大谁小即可 // 假设 a 的 ob_digit 是 [2, 3, 4, 5]，b 的 ob_digit 是 [1, 2, 4, 5] // 那么上面的 while 循环结束之后，i 会等于 1，显然只需要判断索引为 1 时，对应的值谁大谁小即可 if (a->ob_digit[i] < b->ob_digit[i]) { // 如果 a->ob_digit[i] < b->ob_digit[i]，同样说明 a 小于 b // 那么将 sign 设置为 -1，并交换 a 和 b 的位置 sign = -1; { PyLongObject *temp = a; a = b; b = temp; } } // 因为高位在减法的时候会被抵消掉，所以将 size_a 和 size_b 设置成 i + 1 即可 // 假设两个整数的 ob_digit 分别是 [2, 3, 4, 5] 和 [1, 2, 4, 5] // 因为后两个元素是一样的，所以后续只需要对索引为 [0: i+1] 的部分做差即可 size_a = size_b = i+1; } // a 和 b 相减之后，结果一定不超过 a，因此 ob_digit 的长度一定小于等于 size_a z = _PyLong_New(size_a); if (z == NULL) return NULL; // 然后下面的逻辑和 x_add 是类似的 for (i = 0; i < size_b; ++i) { // 让 a 的 ob_digit[i] 减去 b 的 ob_digit[i] // 当然，由于上一个元素在相减的时候，可能会向当前元素借位，因此还要再减去 borrow // 如果没借位，那么 borrow 是 0，如果借位了，那么 borrow 是 1 // 然后如果当前元素相减的结果也小于 0，那么继续向下一个元素借位 // 但我们似乎没有看到借位的逻辑，这是因为 digit 是无符号 32 位整型，负数会发生环绕 // 假设这里相减得到的是 -100，那么结果就是 2 ** 32 - 100 // 所以存储的负数会变成 \"2 ** 32 + 该负数\"，相当于自动向数组的下一个元素借了一位 // 但 digit 只用 30 个位，所以借一位之后应该加上 2 ** 30，而目前加的是 2 ** 32 borrow = a->ob_digit[i] - b->ob_digit[i] - borrow; // 所以还要和 PyLong_MASK 按位与，只保留后 30 个位的值 // 当然如果没有产生借位，borrow & PyLong_MASK 的结果还是 borrow z->ob_digit[i] = borrow & PyLong_MASK; // 如果借位了，下一轮循环的时候，肯定要多减个 1，但问题是怎么判断有没有借位呢？ // 很简单，如果没有借位，borrow 一定小于 2 ** 30，第 31 个位一定是 0 // 如果借位了，那么 borrow 一定大于 2 ** 30，第 31 个位一定是 1 // 所以让 borrow 右移 30 个位 borrow >>= PyLong_SHIFT; // 然后和 1 按位与，如果产生了借位，borrow 就是 1，否则就是 0 // 等到下一轮循环的时候，再减去 borrow borrow &= 1; /* 所以 Python 底层的整数只用 30 个位真的非常巧妙，尤其是在减法的时候 由于 digit 是 32 位，借位时会加上 2 ** 32 但底层只用 30 个位，所以再和 PyLong_MASK 按位与，只保留后 30 个位 而当前元素如果借位了，那么数组下一个元素要减去 1，但怎么判断它有没有借位呢？ 首先两个不超过 2 ** 30 - 1 的数，相减的结果如果为正（没产生借位） 那么一定也不会超过 2 ** 30 - 1，换句话说其结果对应的第 31 位一定是 0 但如果两个整数相减的结果为负，那么会自动加上 2 ** 32，因此第 31 位一定是 1 所以再让 borrow 右移 30 位，并和 1 按位与 如果结果为 1，证明相减为负数，确实向下一个元素借了 1，因此下一次循环时会多减一个 1 如果结果为 0，那么说明没有借位，下一次循环时相当于多减了一个 0 */ } // 如果 size_a 和 size_b 不相等，那么还需要继续处理 a 的 ob_digit 剩余的元素 for (; i < size_a; ++i) { // 这里的逻辑和之前分析 x_add 是类似的 borrow = a->ob_digit[i] - borrow; z->ob_digit[i] = borrow & PyLong_MASK; borrow >>= PyLong_SHIFT; borrow &= 1; } // 只不过由于不会产生进位，因此不需要再对 borrow 做额外判断 // 而 x_add 中最后还要判断 carry 有没有进位 assert(borrow == 0); // 如果 sign < 0，那么证明是负数，因此还要改变 z 的符号 if (sign < 0) { Py_SIZE(z) = -Py_SIZE(z); } // 最后同样要将 z 规范化，将高位的 0 忽略掉 // 比如 100000 - 99999，结果是 000001，显然只需要保留最低位的 1 即可 // 另外如果相减的结果是小整数，那么直接从池子里获取，否则返回新创建的 return long_normalize(z);\n} 同样的，关于绝对值减法，我们也用 Python 代码演示一遍，感受底层的运算过程。 a = [5, 3]\nb = [6, 1]\nresult = [] # 如果计算 a - b，整个过程是怎样的呢？\n# 首先是 a[0] - b[0]，由于 a[0] < b[0]，所以要借一位，而一个位是 2 ** 30\nresult.append(a[0] + 2 ** 30 - b[0])\n# 注：源码中加的是 2 ** 32，所以之后还要和 PyLong_MASK 按位与\n# 因此 a[0] + 2 ** 30 - b[0] 等价于 (a[0] + 2 ** 32 - b[0]) & (2 ** 30 - 1) # 然后是 a[1] - b[1]，由于 a[1] 被借走了一个位，因此要减 1\nresult.append(a[1] - 1 - b[1])\nprint(result) # [1073741823, 1] # 验证一下\nprint( (a[0] + a[1] * 2 ** 30) - (b[0] + b[1] * 2 ** 30)\n) # 2147483647\nprint( result[0] + result[1] * 2 ** 30\n) # 2147483647 以上就是绝对值减法，设计的非常巧妙，可以多看几遍，并用列表模拟 ob_digit 数组，然后实际测试一下。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 绝对值减法：x_sub","id":"78","title":"绝对值减法：x_sub"},"79":{"body":"关于整数的内容，我们就介绍完了。回顾一下，首先我们剖析了整数的底层实现，了解了它不会溢出的奥秘，然后又介绍了小整数对象池。但也正如之前所说，使用数组实现大整数并不是什么特别新颖的思路，它的难点在于数学运算，这是非常考验编程技巧的地方。 而我们这里只是分析了加减法，至于乘除则更加复杂，这里就不再分析了。关于乘法，解释器采用的是效率更高的 karatsuba 算法，比较有意思，有兴趣可以自己查看一下。 综上所述不难发现 Python 效率低的原因，毕竟一个简单的整数运算都要做这么多工作。当然了，解释器内部也定义了很多快分支，会提前检测能否使用快速通道进行处理，当无法使用快速通道时，再走通用逻辑。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"19. 探究 Python 整数的加减法，感受大整数的运算哲学与魅力 » 小结","id":"79","title":"小结"},"8":{"body":"以上我们就聊了聊 Python 的变量和对象，核心就在于：变量保存的不是对象本身，而是对象的内存地址，站在 C 的角度上看变量就是一个指针。 尽管 Python 一切皆对象，但你拿到的都是对象的指针，变量是一个指针，函数是一个指针，元组、列表、字典里面存储的还是指针。我们可以想象一下列表，它底层是基于数组实现的，由于 C 数组要求里面每个元素的类型和大小都相同，因此从这个角度上讲，列表内部存储的只能是指针。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"2. 变量和对象，它们之间有什么区别和联系呢？ » 小结","id":"8","title":"小结"},"80":{"body":"本篇文章来聊一聊布尔值是怎么实现的，在 Python 里面 True 和 False 虽然是关键字，但它们其实也是对象。 下面我们就来详细地解释一下。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 楔子","id":"80","title":"楔子"},"81":{"body":"先来说一下布尔类型本身，我们知道 bool 继承自 int，所以 True 和 False 也具备整数的特征。 print(bool.__base__) # <class 'int'>\nprint(isinstance(True, bool)) # True # True 和 False 可以当成 1 和 0 来用\nprint(True * 2) # 2\nprint(3 // 3 == True) # True\nprint(sum([True, 1, 2])) # 4\nprint(False + 1) # 1 bool 在底层对应 PyBool_Type，因此我们可以肯定地讲，PyBool_Type 的 tp_base 字段的值一定是 &PyLong_Type。 // Objects/boolobject.c\nPyTypeObject PyBool_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"bool\", sizeof(struct _longobject), 0, 0, /* tp_dealloc */ 0, /* tp_vectorcall_offset */ 0, /* tp_getattr */ 0, /* tp_setattr */ 0, /* tp_as_async */ bool_repr, /* tp_repr */ &bool_as_number, /* tp_as_number */ // ... &PyLong_Type, /* tp_base */ // ...\n}; bool 继承 int，所以它也实现了 tp_as_number。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔类型","id":"81","title":"布尔类型"},"82":{"body":"既然 bool 继承 int，那么布尔值和整数的底层结构是一样的。 // Objects/boolobject.c // PyLongObject 是 struct _longobject 的类型别名\nstruct _longobject _Py_FalseStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 0) { 0 }\n}; struct _longobject _Py_TrueStruct = { PyVarObject_HEAD_INIT(&PyBool_Type, 1) { 1 }\n}; 我们看到布尔值在底层是静态定义好的 PyLongObject 结构体实例，ob_digit 分别为 [0] 和 [1]，所以 False 和 True 完全可以当成 0 和 1 来用。当然啦，由于变量都是 PyObject *，所以这两个结构体实例一般不直接用，而是用底层提供的两个宏。 // Include/boolobject.h /* Use these macros */\n#define Py_False ((PyObject *) &_Py_FalseStruct)\n#define Py_True ((PyObject *) &_Py_TrueStruct) 当返回 Python 的 True 和 False 时，底层会返回 Py_True 和 Py_False，也就是转成 PyObject * 之后再返回。为此解释器还提供了两个宏。 // Include/boolobject.h #define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True\n#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False 当然这些应该比较简单了。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的底层结构","id":"82","title":"布尔值的底层结构"},"83":{"body":"创建布尔值有两种方式，一种是基于 C 整数创建，另一种是将 Python 对象转成布尔值。 基于 C 整数创建，会通过 PyBool_FromLong 函数，显然它是布尔对象的特定类型 API。 // Objects/boolobject.c PyObject *PyBool_FromLong(long ok)\n{ PyObject *result; if (ok) result = Py_True; else result = Py_False; Py_INCREF(result); return result;\n} 这个特定类型 API 一般都是解释器内部使用，或者编写扩展的时候使用。而除了这种方式，我们还可以调用 bool 类型，将对象转成布尔值。 // Objects/boolobject.c // 基于 Python 对象创建，比如 bool(obj)\n// 显然会调用 PyBool_Type 的 tp_new，在底层该字段被赋值为 bool_new\ntatic PyObject *\nbool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\n{ // 保存接收的参数，先设置为 False PyObject *x = Py_False; long ok; // bool 类型不接收关键字参数 if (!_PyArg_NoKeywords(\"bool\", kwds)) return NULL; // 最多接收 1 个位置参数，解析出来赋值给 x // 如果不传位置参数，那么 x 就是上面设置的 Py_False if (!PyArg_UnpackTuple(args, \"bool\", 0, 1, &x)) return NULL; // 调用 Pyobject_Islrue 判断 x 是真是假 // 如果为真返回 1，否则返回 0 ok = PyObject_IsTrue(x); if (ok < 0) return NULL; // 将整数转成布尔值 return PyBool_FromLong(ok);\n} 所以核心就在 PyObject_IsTrue 函数里面，看一下它的内部逻辑。 // Objects/object.c\nint\nPyObject_IsTrue(PyObject *v)\n{ Py_ssize_t res; // 如果 v 本身是布尔值 True，那么返回 1 if (v == Py_True) return 1; // 如果 v 本身是布尔值 False，那么返回 0 if (v == Py_False) return 0; // 如果 v 是 None，那么返回 0 if (v == Py_None) return 0; // 如果 v 是数值型对象，并且它的类型对象定义了 __bool__，那么调用 else if (v->ob_type->tp_as_number != NULL && v->ob_type->tp_as_number->nb_bool != NULL) res = (*v->ob_type->tp_as_number->nb_bool)(v); // 如果 v 是映射型对象，并且它的类型对象定义了 __len__，那么调用 // 说白了就是基于内部的键值对个数进行判断 else if (v->ob_type->tp_as_mapping != NULL && v->ob_type->tp_as_mapping->mp_length != NULL) res = (*v->ob_type->tp_as_mapping->mp_length)(v); // 如果 v 是序列型对象，并且它的类型对象定义了 __len__，那么调用 // 也就是基于内部的元素个数进行判断 else if (v->ob_type->tp_as_sequence != NULL && v->ob_type->tp_as_sequence->sq_length != NULL) res = (*v->ob_type->tp_as_sequence->sq_length)(v); // 否则默认为真，比如我们自定义类的实例 else return 1; // 如果 res 大于 0，返回 1，否则返回 0 return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);\n} 当 PyObject_IsTrue 调用完之后，再基于 PyBool_FromLong 创建布尔值即可，我们用 Python 代码演示一下。 # 不传参数，默认返回 False\nprint(bool()) # False # 整数实现了 __bool__，所以 bool(1) 会调用 int.__bool__(1)\nprint(bool(1)) # True # 字符串实现了 __len__，所以 bool(\"abc\") 会调用 str.__len__(\"abc\")\nprint(bool(\"abc\")) # True class A: pass # 自定义类没有实现 __bool__、__len__\n# 所以在 PyObject_IsTrue 里面最终会走 else 分支，直接为真\nprint(bool(A())) # True # 但如果定义了 __len__，那么是否为真取决于 __len__ 的返回值\n# 并且 __len__ 要定义在类型对象里面，因为 a.__len__() 其实只是语法糖\n# 底层真正执行的是 A.__len__(a)，关于这部分细节后续介绍类的时候会细说\ntype.__setattr__(A, \"__len__\", lambda self: 0)\n# 因为 __len__ 返回的是 0，所以为假，注意：__len__ 要返回整数\nprint(bool(A())) # False # 如果再实现一个 __bool__ 呢？\ntype.__setattr__(A, \"__bool__\", lambda self: True)\n# 我们发现结果又变成了 True，因为 __bool__ 返回的是 True（必须返回布尔值）\n# 并且在源码中，__bool__ 查找的优先级高于 __len__\nprint(bool(A())) # True 现在你是不是对布尔值有一个更深的印象了呢？一个简单的布尔值，居然有这么多可说的。 但是还没结束，我们还要补充一个知识点，先看一段代码。 name = \"satori\" if name: pass if bool(name): pass 这两个 if 判断有啥区别呢？首先 if bool(name) 我们已经分析过了，它会执行 bool_new 函数，将参数解析出来，接着再调用 PyObject_IsTrue，最后得到布尔值。 而对于 if name 来说，它会直接调用 PyObject_IsTrue，后续在分析 if 语句的时候会介绍。所以在工作中，我们使用 if name 即可。 当然啦，获取布尔值除了 bool(obj) 之外，还可以使用 not not obj。 name = \"satori\" print(bool(name)) # True\nprint(not not name) # True 这两者又有什么区别呢？首先 bool(name) 在 Python 里面是一个调用，会进行参数解析，拿到对象之后调用 PyObject_IsTrue 判断真假，正常执行的话，会返回 1 或 0。然后基于 1 和 0 创建布尔值，为 1 返回 True，为 0 返回 False。 而 not name 会对应一条 UNARY_NOT 字节码，它内部也会调用 PyObject_IsTrue，如果结果为 1 返回 False，为 0 返回 True，正好是相反的。所以 not not name 则相当于在 not name 的基础上再反过来一次，这样就和 bool(name) 的结果是一致的了。 当然在工作中，使用哪种都可以，看自己喜好。但为了代码的可读性，显式获取布尔值的时候还是建议使用 bool(name)，效率上没太大差别。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 布尔值的创建","id":"83","title":"布尔值的创建"},"84":{"body":"以上就是布尔值相关的内容。 bool 继承 int，并且布尔值在底层和整数使用同一个结构体，只是 ob_type 不同； 布尔值具备整数的所有特征，可以像整数一样参与各种运算，其中 True 会被解释成 1，False 会被解释成 0； 布尔值有两种，分别是 True 和 False，它们是单例的，判断时应该使用 is，而不是 ==，除非你把 True 和 False 当成整数使用； 在 Python 里面如果要创建布尔值，有三种方式：通过 True 和 False 字面量、调用类型对象 bool、使用 not not； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"20. Python 的布尔值是怎么实现的，你对它的了解有多深呢？ » 小结","id":"84","title":"小结"},"85":{"body":"None 在 Python 里面也是一个对象，用于表示空（值不存在的情况）。比如基于主键从数据库获取记录，如果没有查询到，那么一般会返回 None。另外如果函数没有返回值，那么也会隐式地返回 None，表示返回的是空。 本篇文章就来聊一聊 None 是怎么实现的。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 楔子","id":"85","title":"楔子"},"86":{"body":"和其它对象不同，由于 None 没有额外的实体数据，所以它在底层就是一个 PyObject 结构体实例。因此也能看出，None 的大小为 16 字节。 // Objects/object.c\nPyObject _Py_NoneStruct = { _PyObject_EXTRA_INIT 1, &_PyNone_Type\n}; None 在底层只包含引用计数和类型，然后类型为 _PyNone_Type。由于变量都是 PyObject *，所以和布尔值一样，解释器也提供了相应的宏，从而方便使用。 // Include/object.h\n#define Py_None (&_Py_NoneStruct) 注意：None 是单例的，如果要判断对象是否为空，应该使用 is 关键字。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的底层结构","id":"86","title":"None 的底层结构"},"87":{"body":"说完了 None 本身，再来看看它的类型。 print(type(None)) # <class 'NoneType'> None 的类型是 <class 'NoneType'>，但这个类解释器没有暴露给我们，需要通过 type 去获取。注意：NoneType 无法被继承，当然我们一般也不会去继承它。 class MyType(type(None)): pass\n\"\"\"\nTypeError: type 'NoneType' is not an acceptable base type\n\"\"\" 然后看一下 NoneType 的底层结构，它位于 Objects/object.c 中。 PyTypeObject _PyNone_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) \"NoneType\", 0, 0, none_dealloc, /*tp_dealloc*/ /*never called*/ 0, /*tp_vectorcall_offset*/ 0, /*tp_getattr*/ 0, /*tp_setattr*/ 0, /*tp_as_async*/ none_repr, /*tp_repr*/ &none_as_number, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ 0, /*tp_hash */ 0, /*tp_call */ 0, /*tp_str */ 0, /*tp_getattro */ 0, /*tp_setattro */ 0, /*tp_as_buffer */ Py_TPFLAGS_DEFAULT, /*tp_flags */ 0, /*tp_doc */ 0, /*tp_traverse */ 0, /*tp_clear */ 0, /*tp_richcompare */ 0, /*tp_weaklistoffset */ 0, /*tp_iter */ 0, /*tp_iternext */ 0, /*tp_methods */ 0, /*tp_members */ 0, /*tp_getset */ 0, /*tp_base */ 0, /*tp_dict */ 0, /*tp_descr_get */ 0, /*tp_descr_set */ 0, /*tp_dictoffset */ 0, /*tp_init */ 0, /*tp_alloc */ none_new, /*tp_new */\n}; NoneType 的类型也是 type，然后它实现了 tp_as_number。 // Objects/object.c\nstatic PyNumberMethods none_as_number = { // ... (inquiry)none_bool, /* nb_bool */ // ...\n} 但是只实现了里面的 nb_bool，用于生成布尔值。 // Objects/object.c\nstatic int\nnone_bool(PyObject *v)\n{ return 0;\n} 函数返回的是 0，因此调用 PyBool_FromLong 的时候，会返回 Py_False。 print(bool(None)) # False\nprint(not not None) # False","breadcrumbs":"21. Python 的 None 是怎么实现的？ » None 的类型","id":"87","title":"None 的类型"},"88":{"body":"以上我们就简单介绍了 None，当然内容有些过于简单了，因为 None 本身就没多少内容，核心就两点： None 是单例的； 判断的时候使用 is 关键字； 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"21. Python 的 None 是怎么实现的？ » 小结","id":"88","title":"小结"},"89":{"body":"本篇文章来探讨一下切片是如何实现的，因为在操作字符串、元组、列表等数据结构时，我们经常会使用切片截取数据，所以对切片做一个全方位的了解是很有必要的。 data = list(range(10))\nprint(data[1: 8: 3]) # [1, 4, 7] 以上就是基于切片截取数据，在工作中我们会大量使用切片。但你知道吗，其实切片也是一个对象，类型为 slice，下面我们来看一下切片的底层结构。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 楔子","id":"89","title":"楔子"},"9":{"body":"在程序开发中，我们每时每刻都在创建对象，那到底什么是对象呢？ 其实一个对象就是一片被分配的内存空间，空间可以是连续的，也可以是不连续的。然后空间里面存储了指定的数据，并提供了操作数据的一些功能方法。而按照是否可变和内存大小是否固定，我们可以将对象进行如下分类。 可变对象和不可变对象； 定长对象和变长对象； 下面来详细解释一下。","breadcrumbs":"3. Python 对象有哪几种，我们可以从哪些角度进行分类呢？ » 楔子","id":"9","title":"楔子"},"90":{"body":"切片的类型是 slice，那么根据解释器的 API 命名规则，我们猜测： 切片（slice 对象）在底层对应 PySliceObject 结构体实例； slice 类型本身在底层对应 PySlice_Type； 下面看一下具体实现。 // Include/sliceobject.h\ntypedef struct { PyObject_HEAD PyObject *start, *stop, *step;\n} PySliceObject; 切片是不可变对象，除了对象的公共头部之外，还有三个字段，分别表示切片的起始位置、终止位置、步长。这也意味着创建切片时，可以给 slice 传递三个参数。 # 创建一个切片\ns = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3) 问题来了，切片创建的时候，传递的参数绑定在了哪些属性上呢？前面我们说过，实例对象可以绑定哪些属性，会定义在类型对象的 tp_members 字段中。 我们看到切片拥有三个属性，名称也是 start、stop、step。 s = slice(1, 8, 3)\nprint(s) # slice(1, 8, 3)\nprint(s.start) # 1\nprint(s.stop) # 8\nprint(s.step) # 3 非常简单，你在 Python 里面看到的一切，都能从源码中找到答案。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的底层结构","id":"90","title":"切片的底层结构"},"91":{"body":"切片是内置类型的实例对象，对于这样的对象，有两种创建方式，相信你已经知道我要说什么了。我们在最开始专门用了十篇文章，从宏观的角度介绍了 Python 的对象模型，目的就在于此。 创建内置对象的两种方式： 通过对象的特定类型 API 创建，只适用于内置对象； 通过调用类型对象创建，所有对象都适用； 解释器对内置对象了如指掌，它们对应的结构体在源码中是写死的，直接 sizeof 一下即可知晓要申请多大内存，完全不需要借助类型对象。 data = list(range(10))\n# 通过特定类型 API 创建\nprint(data[1: 8: 3]) # [1，4，7]\n# 通过调用类型对象创建\nprint(data[slice(1, 8, 3)]) # [1，4，7] 解释器看到 data[1: 8: 3] 就知道要创建一个切片，并且是在数据截取的过程中创建的，我们不能单独写一个 1: 8: 3，这是不符合语法规则的。如果真的想单独创建一个切片，那么需要通过 slice(1, 8, 3) 的方式。 下面通过源码，看一下底层的创建过程。 // Objects/sliceobject.c\nstatic PyObject *\nslice_new(PyTypeObject *type, PyObject *args, PyObject *kw)\n{ PyObject *start, *stop, *step; start = stop = step = NULL; // slice 不接收关键字参数，因此 kw 要指向空字典 if (!_PyArg_NoKeywords(\"slice\", kw)) return NULL; // slice 接收 1 ~ 3 个位置参数，因此 args 指向的元组必须包含 1 ~ 3 个元素 // 然后解析 args，将内部的元素分别赋值给 start、stop、step if (!PyArg_UnpackTuple(args, \"slice\", 1, 3, &start, &stop, &step)) return NULL; // 如果 stop == NULL，说明只传递了一个参数，按照顺序这个参数会赋值给 start // 但很明显，如果只有一个参数，那么这个参数应该交给 stop 保存 // 于是让 stop = start，并让 start = NULL，至于这么做的原因可以想象一下 range // 如果是 range(0, 9)，那么起始位置和终止位置就是 0 和 9 // 但如果是 range(9)，那么这个 9 就是终止位置 if (stop == NULL) { stop = start; start = NULL; } // 假设传了一个参数 8，那么这里就是 PySlice_New(NULL, 8, NULL) // 假设传了两个参数 1、8，那么这里就是 PySlice_New(1, 8, NULL) // 假设传了三个参数 1、8、3，那么这里就是 PySlice_New(1, 8, 3) return PySlice_New(start, stop, step);\n} // 切片缓存，注：slice_cache 只能缓存一个切片\nstatic PySliceObject *slice_cache = NULL; PyObject *\nPySlice_New(PyObject *start, PyObject *stop, PyObject *step)\n{ PySliceObject *obj; // 如果 slice_cache 不为 NULL，证明缓存了切片，那么赋值给 obj // 由于 slice_cache 只能缓存一个切片，那么赋值给 obj 之后，自身要重置为 NULL if (slice_cache != NULL) { obj = slice_cache; slice_cache = NULL; _Py_NewReference((PyObject *)obj); } else { // 否则调用 PyObject_GC_New 为 PySliceObject 实例申请内存 obj = PyObject_GC_New(PySliceObject, &PySlice_Type); if (obj == NULL) return NULL; } // 如果 start、stop、step 是 NULL，那么转成 Python 的 None if (step == NULL) step = Py_None; Py_INCREF(step); if (start == NULL) start = Py_None; Py_INCREF(start); if (stop == NULL) stop = Py_None; Py_INCREF(stop); // 设置切片的 start、stop、step 属性 obj->step = step; obj->start = start; obj->stop = stop; // 接收 GC 跟踪（在之后的篇章中会解释） _PyObject_GC_TRACK(obj); // 转成泛型指针之后返回 return (PyObject *) obj;\n} 以上就是切片的创建过程，非常简单，我们用 Python 代码演示一遍。 print(slice(8)) # slice(None, 8, None)\nprint(slice(1, 8)) # slice(1, 8, None)\nprint(slice(1, 8, 3)) # slice(1, 8, 3) 结果和源码是一致的。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片是怎么创建的","id":"91","title":"切片是怎么创建的"},"92":{"body":"从源码中可以看到，切片是有缓存的。 static PySliceObject *slice_cache = NULL; 这个字段用于缓存被回收的切片，并且从切片的创建过程可以看出只会缓存一个，而不是像浮点数那样以链表的形式缓存多个。之所以这么做，是因为在大部分情况下，切片用完之后会立即销毁。 data = list(range(10))\n# 创建一个切片，截取完数据之后就销毁\nprint(data[0: 3]) # [0, 1, 2]\n# 创建一个切片，截取完数据之后就销毁\nprint(data[2: 7]) # [2, 3, 4, 5, 6] 像 data[start: stop: step] 这种形式，当数据截取完毕之后，创建的切片会立即回收，所以对于解释器来说，它只需要缓存一个切片即可。因此你可以认为同一时刻只会存在一个有效切片，那什么时候会存在多个呢？ data = list(range(10))\ns1 = slice(0, 3)\ns2 = slice(2, 7)\nprint(data[s1]) # [0, 1, 2]\nprint(data[s2]) # [2, 3, 4, 5, 6] 在这种情况下，会同时存在多个有效切片，比如 s1 和 s2 都指向了有效的切片。但很明显，我们在工作中不会这么做，而是在截取数据时，让解释器通过切片的特定类型 API 自动创建。 下面我们来打印切片的地址，看看切片是否被缓存起来了。 # 创建一个切片，缓存如果存在，从缓存获取，否则创建新的切片\n>>> s1 = slice(0, 3)\n>>> id(s1)\n140190801666944 # 创建切片，因为 s1 和 s2 是两个独立的切片，所以它们的地址是不一样的\n>>> s2 = slice(2, 7)\n>>> id(s2)\n140190800965120 # 删除 s1，那么它指向的切片会被放到缓存中\n>>> del s1 # 创建新的切片，使用缓存，显然它的地址和之前 s1 指向的切片的地址是一样的\n>>> s3 = slice(1, 5)\n>>> id(s3)\n140190801666944 # 由于缓存为空，那么删除 s2，它指向的切片会被放入缓存\n>>> del s2 # 创建新的切片，显然它的地址和之前 s2 指向的切片的地址是一样的\n>>> s4 = slice(1, 6)\n>>> id(s4)\n140190800965120 打印结果表明，切片是会被缓存的，但我们怎么证明切片只会缓存一个呢？这个直接看源码即可，根据之前的经验，对象被放入缓存这一步一定发生在对象被销毁的时候，所以我们只需要看切片的销毁过程即可。 对象被销毁时，会调用类型对象的 tp_dealloc，也就是析构函数。 类型对象的 tp_basicsize 保存了实例对象的基础大小，对于切片而言就是 sizeof(PySliceObject)，然后切片又是定长对象，因此 tp_itemsize 是 0。所以切片的大小是固定的，PyObject 占 16 字节，start、end、step 各占 8 字节，总共 40 字节，因此任何一个切片的大小都是固定的 40 字节。 而这个大小即使不借助类型对象也可以计算出来，因为内置对象的定义都是写死的，解释器对它们了如指掌。 为了唤醒大家的记忆，加深理解，以前的内容会时不时回顾一下。我们继续看切片的销毁，对应的析构函数是 slice_dealloc。 // Objects/sliceobject.c\nstatic void\nslice_dealloc(PySliceObject *r)\n{ // 取消 GC 跟踪，相关内容后续介绍 _PyObject_GC_UNTRACK(r); // 切片销毁时，减少 start、stop、step 指向对象的引用计数 Py_DECREF(r->step); Py_DECREF(r->start); Py_DECREF(r->stop); // 关键来了，如果 slice_cache 为 NULL，证明没有缓存 // 那么让 slice_cache 保存销毁的切片的指针，而切片的内存不释放 // 这样下一次创建切片时就不需要申请内存了，直接使用缓存即可 // 因为没有申请内存，只是初始化了 start、stop、step 三个字段，所以效率会更高 if (slice_cache == NULL) slice_cache = r; // 否则释放切片所占的内存 else PyObject_GC_Del(r);\n} 从源码中可以看到，如果 slice_cache 不为空，说明已经缓存了一个切片，if 条件不成立，于是会选择释放内存，所以切片只会缓存一个。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片的缓存","id":"92","title":"切片的缓存"},"93":{"body":"切片接收 1 到 3 个元素，但我们可能只传一个，那么剩余的属性是怎么初始化的呢？举个例子： >>> data = list(range(10))\n>>> data[: 5]\n[0, 1, 2, 3, 4]\n>>> data[1:]\n[1, 2, 3, 4, 5, 6, 7, 8, 9]\n>>> data[1:: 2]\n[1, 3, 5, 7, 9]\n>>> data[:: 2]\n[0, 2, 4, 6, 8]\n>>> data[:]\n[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 这些切片都是合法的，当参数不足时，它们的 start、end、step 是怎么设置的呢？ // Objects/sliceobject.c // 该函数接收指向切片的指针，以及三个整型指针\n// 会将切片的起始位置、终止位置、步长解析出来，赋值给 *start、*stop、*step\n// 所以该函数会在其它函数的内部被调用，先声明 Py_ssize_t start, stop, step\n// 然后将切片指针、&start、&stop、&end 传递给 PySlice_Unpack 进行调用\n// 当该函数执行完毕时，外部就拿到了切片的起始位置、终止位置以及步长\nint\nPySlice_Unpack(PyObject *_r, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)\n{ // 将 PyObject * 转成 PySliceObject * PySliceObject *r = (PySliceObject*)_r; Py_BUILD_ASSERT(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX); // 判断步长，如果解析出的步长为空，那么将 *step 赋值为 1 // 所以当不指定步长时，步长会被设置为 1，因此 data[::] 等价于 data[:: 1] if (r->step == Py_None) { *step = 1; } else { // 如果步长不为空，那么它应该是整数，或者是实现了 __index__ 的类的实例对象 // 但如果步长的类型不合法，那么 _PyEval_SliceIndex 里面会设置异常 // 合法的话，会将 r->step 赋值给 *step if (!_PyEval_SliceIndex(r->step, step)) return -1; // 步长不能为 0，否则设置 ValueError(\"slice step cannot be zero\") if (*step == 0) { PyErr_SetString(PyExc_ValueError, \"slice step cannot be zero\"); return -1; } // 如果步长小于 -PY_SSIZE_T_MAX，那么设置为 -PY_SSIZE_T_MAX // 显然这一步基本不会发生 if (*step < -PY_SSIZE_T_MAX) *step = -PY_SSIZE_T_MAX; } // 检测起始位置，如果为 None // 当步长大于 0 时，将 *start 设置为 0 // 当步长小于 0 时，将 *start 设置为 int64 最大值，这背后的原理一会儿解释 if (r->start == Py_None) { *start = *step < 0 ? PY_SSIZE_T_MAX : 0; } // 说明起始位置不为 None else { // 如果起始位置的类型不合法，那么设置异常，直接返回，否则赋值给 *start if (!_PyEval_SliceIndex(r->start, start)) return -1; } // 如果终止位置为 None // 当步长大于 0 时，将 *stop 设置为 PY_SSIZE_T_MAX，即 int64 最大值 // 当步长小于 0 时，将 *stop 设置为 PY_SSIZE_T_MIN，即 int64 最小值 if (r->stop == Py_None) { *stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX; } // 说明终止位置不为 None else { // 如果终止位置不合法，那么设置异常，直接返回，否则赋值给 *stop if (!_PyEval_SliceIndex(r->stop, stop)) return -1; } return 0;\n} 代码逻辑有一些绕，虽然我们知道它在做什么，但问题是这么做的意义是什么呢？在解释之前，我们先用 Python 代码将该函数所做的事情再描述一遍，这样更容易理解。 PY_SSIZE_T_MAX = 2 ** 63 - 1\nPY_SSIZE_T_MIN = -2 ** 63 # 如果切片同时包含起始位置、终止位置、步长，会直接赋值给 start、end、step\n# 这种情况最简单，就不赘述了，我们来讨论未被同时指定的情况 # 步长为空，比如 data[1: 8]\nstart = 1\nend = 8\nstep = 1 # 起始位置为空，步长大于 0，比如 data[: 8]\nstart = 0\nend = 8\nstep = 1\n# 起始位置为空，步长小于 0，比如 data[: 8: -1]\nstart = PY_SSIZE_T_MAX\nend = 8\nstep = -1 # 终止位置为空，步长大于 0，比如 data[2:]\nstart = 2\nend = PY_SSIZE_T_MAX\nstep = 1\n# 终止位置为空，步长小于 0，比如 data[2:: -1]\nstart = 2\nend = PY_SSIZE_T_MIN\nstep = -1 # 起始位置、终止位置均为空，步长大于 0，比如 data[::]\nstart = 0\nend = PY_SSIZE_T_MAX\nstep = 1\n# 起始位置、终止位置均为空，步长小于 0，比如 data[:: -1]\nstart = PY_SSIZE_T_MAX\nend = PY_SSIZE_T_MIN\nstep = -1 下面来分析一下它为什么要这么做，首先我们要知道，所谓的切片截取数据，本质上就是一层 for 循环。 def slice_data(data: list, start: int, end: int, step: int) -> list: ret_data = [] assert step != 0 if step > 0: while start < end and start < len(data): ret_data.append(data[start]) start += step else: while start > end and start >= 0: ret_data.append(data[start]) start -= step * -1 return ret_data data = list(range(0, 10))\nprint(data[: 5])\nprint(slice_data(data, 0, 5, 1))\n\"\"\"\n[0, 1, 2, 3, 4]\n[0, 1, 2, 3, 4]\n\"\"\"\nprint(data[8: 3: -1])\nprint(slice_data(data, 8, 3, -1))\n\"\"\"\n[8, 7, 6, 5, 4]\n[8, 7, 6, 5, 4]\n\"\"\" 所以当步长大于 0 时，从左往右遍历，当步长小于 0 时，从右往左遍历。最后我们再画两张图，看完之后你就彻底理解了。 当步长大于 0 时： 步长大于 0 时，从左往右遍历。 如果 start 未指定，那么设置为 0，表示从头截取，这很好理解，但问题是 end 应该设置为多少。由于 PySlice_Unpack 相当于只是做了一步预处理，它并不包含截取的原始数据的信息，所以 end 如果不指定，直接设置为 int64 最大值。 当步长小于 0 时： 当步长小于 0 时，从右往左遍历。 因为不知道截取的原始数据有多长，所以如果 start 未指定，那么设置为 int64 最大值。但不管是从左往右还是从右往左，end 都是不包含的，所以当 end 为空时，不能指定为 0，否则索引为 0 的元素就取不到了。当然也不能设置为 -1，因为 -1 会被当成是合法的负数索引，后续截取数据时会被解释为最后一个元素的索引，所以它被设置成了 int64 最小值。 我们以使用切片截取列表为例，后续介绍列表的时候还会详细说： 代码中的 item 指向切片，截取数据之前要先获取它内部的 start、stop、step 属性，于是创建三个 Py_ssize_t 变量，并将指针作为参数，调用 PySlice_Unpack。当调用结束后，就拿到了切片的起始位置、终止位置、步长。 但还没有结束，我们说 PySlice_Unpack 只是对切片里面的值做了一些预处理，比如当 step 为 1 并且 end 没有指定时，那么 end 会被设置为 PY_SSIZE_T_MAX。 所以它下面又调用了函数 PySlice_AdjustIndices，会将截取的原始数据的长度也传进去，然后对 start、end、step 做进一步处理，所有的序列对象在基于切片截取数据时都会有这两步。我们看一下该函数的逻辑。 // Objects/sliceobject.c\nPy_ssize_t\nPySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)\n{ // 参数 length：截取的原始数据的长度 // 参数 start、stop：指向起始位置和终止位置的指针 // 参数 step：步长 assert(step != 0); assert(step >= -PY_SSIZE_T_MAX); // 如果起始位置小于 0 if (*start < 0) { // 那么加上长度，得到正数索引，因为负数索引就是个语法糖 *start += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *start < 0 时， 直接将 *start 设置为 0，最终会从第一个元素开始往后遍历 如果 step < 0，表示从后往前遍历，因此当 *start < 0 时， 显然遍历不到任何元素，因为索引是大于 0 的，所以直接将 *start 设置为 -1 */ if (*start < 0) { *start = (step < 0) ? -1 : 0; } } // 如果起始位置大于等于长度，继续判断步长 else if (*start >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *start >= length 时， 显然遍历不到任何元素，因为最大索引为 length - 1 所以直接将 *start 设置为 length 如果 step < 0，表示从后往前遍历，因此当 *start >= length 时， 直接将 *start 设置为 length - 1，最终会从最后一个元素往前遍历 */ *start = (step < 0) ? length - 1 : length; } // 如果终止位置小于 0 if (*stop < 0) { // 那么加上长度，得到正数索引 *stop += length; // 如果加上长度之后还小于 0，那么判断步长 /* 如果 step > 0，表示从前往后遍历，因此当 *stop < 0 时， 显然遍历不到任何元素，因此直接将 *stop 设置为 0 如果 step < 0，表示从后往前遍历，因此当 *stop < 0 时， 直接将 *stop 设置为 -1，最终会从后往前遍历到头 */ if (*stop < 0) { *stop = (step < 0) ? -1 : 0; } } // 如果终止位置大于等于长度，继续判断步长 else if (*stop >= length) { /* 如果 step > 0，表示从前往后遍历，因此当 *stop >= length 时， 直接设置为 length，会从 start 往后遍历到头 如果 step < 0，表示从后往前遍历，因此当 *stop >= length 时， 此时遍历不到任何元素，直接设置为 length - 1 */ *stop = (step < 0) ? length - 1 : length; } // 到这里 *start、*stop 就已经转换好了 // 或者说 PY_SSIZE_T_MIN、PY_SSIZE_T_MAX 已经基于 length 被替换掉了 // 然后计算 *start 和 *stop 之间的距离，也就是应该要遍历多少个元素 if (step < 0) { if (*stop < *start) { return (*start - *stop - 1) / (-step) + 1; } } else { if (*start < *stop) { return (*stop - *start - 1) / step + 1; } } // 如果不符合条件的话，比如像 data[3: 8: -1]，显然遍历不到任何元素 // 那么直接返回 0 return 0;\n} 可以看到，哪有什么岁月静好，我们之所以能够通过各种姿势使用切片，全靠解释器在替我们负重前行，它在背后做了非常多的工作。正如前面提到的，C 是一门很单纯的语言，Python 的花里胡哨的操作回归到 C 里面，就是普通的 if else 以及 while、for。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 切片属性的初始化","id":"93","title":"切片属性的初始化"},"94":{"body":"以上我们就介绍了切片的底层结构，切片也是一个对象，拥有自己的缓存。并且 Python 针对切片提供的语法也非常丰富： data[:: 1]，从左往右遍历，或者说从前往后遍历； data[:: -1]，从右往左遍历； data[:: 2]，只筛选索引为偶数的元素； 起始位置和终止位置可以为负数，会自动转成正数； 所以切片用起来很方便，但要明白这背后都是因为解释器做了大量的工作。当然大部分情况下我们使用切片都是无感知的，一般不会刻意地想着要去创建一个切片，只是字符串、列表、元组等数据都支持通过切片截取数据，所以切片还是值得我们深入了解一下的。 欢迎大家关注我的公众号：古明地觉的编程教室。 如果觉得文章对你有所帮助，也可以请作者吃个馒头，Thanks♪(･ω･)ﾉ。","breadcrumbs":"22.深度解密 Python 切片的实现原理 » 小结","id":"94","title":"小结"},"95":{"body":"本篇文章来聊一聊 bytes 对象，也就是字节串，而说到字节串就不得不提字符串。 字符串是由任意数量的字符组成的序列，用于表示文本数据。在大多数编程语言中，字符串被视为一种高层数据类型，能够处理和操作文本信息。 字节串是由任意数量的字节组成的序列，用于表示二进制数据。 字符串具有特定的字符编码，比如 UTF-8、ASCII 等等，这些编码定义了字符如何在内存中表示。而字节串没有预定义的编码，它只是原始的二进制序列，在处理非文本数据时非常有用。 计算机在存储数据以及通过网络传输数据时，数据格式都是二进制字节串，所以如果你想传输一段文本，那么必须先将它转成字节串。 name = \"古明地觉\" print(name.encode(\"utf-8\"))\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\"\nprint(name.encode(\"utf-16\"))\n\"\"\"\nb'\\xff\\xfe\\xe4S\\x0ef0W\\xc9\\x89'\n\"\"\"\nprint(name.encode(\"gbk\"))\n\"\"\"\nb'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5'\n\"\"\" 字节串传输之后还需要转成文本数据，这个过程叫做反序列化。但由于字节串不保存编码信息，它只是一坨字节流，因此反序列化时还需要知道指定的编码，如果编码指定错误，那么反序列化会失败。 # name_utf8 和 name_gbk 都只是普通的字节串\nname_utf8 = b'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\nname_gbk = b'\\xb9\\xc5\\xc3\\xf7\\xb5\\xd8\\xbe\\xf5' # 如果反序列化，必须要知道原始文本使用的编码是什么\nprint(name_utf8.decode(\"utf-8\"))\nprint(name_gbk.decode(\"gbk\"))\n\"\"\"\n古明地觉\n古明地觉\n\"\"\" # 如果指定了错误的编码，那么反序列化会失败\ntry: name_utf8.decode(\"gbk\")\nexcept UnicodeDecodeError as e: print(e)\n\"\"\"\n'gbk' codec can't decode byte 0xa7 in position 10: illegal multibyte sequence\n\"\"\" 另外我们看到字符串只有 4 个字符，但序列化之后的字节串却明显多于 4 个字节。这是因为一个字节最多能表示 256 个字符，对于英文字符来说已经足够了，但对于非英文字符则力不从心，毕竟光普通的中文字符就好几千个。 所以便有了多字节编码，它使用多个字节来表示一个字符，具体使用多少个，则取决于编码。如果是 GBK 编码，那么两个字节表示一个字符，如果是 UTF-8 编码，那么三个字节表示一个字符，当然这里的字符指的是非英文字符。所以在反序列化的时候，需要指定正确的编码，否则解析一定会失败。 以上就是关于 bytes 对象的一些基础概念，下面来看一下它的底层结构。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 楔子","id":"95","title":"楔子"},"96":{"body":"字节串的类型是 bytes，那么我们有理由相信它在底层由 PyBytesObject 结构体表示。 // Include/bytesobject.h\ntypedef struct { PyObject_VAR_HEAD Py_hash_t ob_shash; char ob_sval[1];\n} PyBytesObject; 我们看一下里面的字段： PyObject_VAR_HEAD：变长对象的公共头部，因为字节串是由若干个字节组成的，具有长度的概念，所以它是变长对象。 ob_shash：保存字节串的哈希值，因为计算哈希值需要遍历所有的字节，如果每获取一次哈希值都要重新计算的话，性能会有影响。所以第一次计算之后会用 ob_shash 字段保存起来，之后就不再计算了。如果 bytes 对象的哈希值尚未计算，那么 ob_shash 为 -1。 ob_sval：char 类型的数组，负责保存具体的字节。这个和整数的 ob_digit 字段的声明方式类似，由于数组长度不属于类型的一部分，因此虽然声明的时候长度是 1，但其实长度不受限制，具体是多少取决于 bytes 对象的字节数量。 我们创建几个不同的 bytes 对象，然后通过画图感受一下。 val = b\"\" 我们看到即便是空的字节序列，底层的 ob_sval 也需要一个 '\\0'，那么这个结构体实例占多大内存呢？首先 ob_sval 之外的四个成员，每个都占 8 字节，而 ob_sval 是一个 char 类型的数组，一个 char 占 1 字节，所以 bytes 对象的内存大小等于 32 + ob_sval 的长度。 而 ob_sval 里面至少有一个 '\\0'，因此一个空的字节序列需要占 33 字节的内存。 >>> sys.getsizeof(b\"\")\n33 注意：ob_size 统计的是 ob_sval 中有效字节的个数，不包括 '\\0'，但是计算占用内存的时候，显然是需要考虑在内的，因为它确实占用了一个字节的空间。因此我们说 bytes 对象占的内存等于 33 + ob_size 也是可以的。 val = b\"abc\" 显然内存大小等于 32 + 4 = 36 字节。 因此 bytes 对象的底层结构还是很好理解的，因为它是字节序列，所以在底层用一个 char 类型的数组来维护具体的值再合适不过了。","breadcrumbs":"23. bytes 对象（字节串）是怎么实现的？解密它的内部原理 » 字节串的底层结构","id":"96","title":"字节串的底层结构"},"97":{"body":"下面来看一下 bytes 对象的创建方式，这里我们暂时先不介绍底层是如何创建的，等到介绍缓存池的时候再说。这里来聊一聊如何在 Python 中创建，虽然该系列是剖析源码，但是光说底层的话可能会有一些无趣，因此这个过程中也会穿插大量的 Python 内容。 先观察 Python 代码执行时的表现，再通过底层的源码进行解析，两者结合起来更容易让人理解。另外该系列也能保证即使你没有相应的 C 语言基础，也一样能收获很多。 b = b\"hello\" 以上是最简单的创建方式，它使用我们之前说的特定类型 API，但通过这种方式创建的字节串只能包含 ASCII 字符。下面这种方式是不行的： b = b\"古明地觉\" \"古明地觉\" 包含非 ASCII 字符，所以采用多字节编码，但编码方式也有多种，比如 UTF-8、GBK 等等，解释器不知道你用的是哪一种。因此采用字面量的方式，只能包含 ASCII 字符，因为对于 ASCII 字符而言，不管使用哪种编码，得到的结果都是一样的。但如果包含非 ASCII 字符，那么必须手动指定编码。 b = bytes(\"古明地觉\", encoding=\"utf-8\")\nprint(b)\n\"\"\"\nb'\\xe5\\x8f\\xa4\\xe6\\x98\\x8e\\xe5\\x9c\\xb0\\xe8\\xa7\\x89'\n\"\"\" 里面的 \\x 表示十六进制，我们知道字符 a 的 ASCII 码是 97，对应十六进制是 61。同理字符 b 是 62，字符 c 是 63，那么 b\"abc\" 就还可以这么创建。 b = b\"\\x61\\x62\\x63\"\nprint(b)\n\"\"\"\nb'abc'\n\"\"\" 以上是根据十六进制的数字创建 bytes 对象，注意：采用这种方式创建必须指定 \\x，然后 b\"\\x61\" 表示的是 1 个字节，并且该字节对应的 ASCII 码的十六进制是 61，也就是字符 a。而 b\"61\" 表示的是两个字节。 # \\x61、\\x62、\\x63 均表示 1 字节\nprint(b\"\\x61\\x62\\x63\")\n\"\"\"\nb'abc'\n\"\"\"\n# 下面这个创建的 bytes 对象是 6 字节\nprint(b\"616263\")\n\"\"\"\nb'616263'\n\"\"\" 可如果有一串字符也是十六进制格式，但开头没有 \\x，这个时候要怎么转成 bytes 对象呢？很简单，使用 bytes.fromhex 方法即可。 print(bytes.fromhex(\"616263\"))\n\"\"\"\nb'abc'\n\"\"\" # 转成 bytes 对象之后，如果是可打印字符的话\n# 那么会显示对应的字符，比如 abc\n# 如果是不可打印字符，就原本输出，比如 \\xff\nprint(bytes.fromhex(\"616263FF\"))\n\"\"\"\nb'abc\\xff'\n\"\"\" 该方法会将里面的字符串当成十六进制来解析，得到 bytes 对象。并且使用这种方式的话，字符的个数一定是偶数，每个字符的范围均是 0~9、A~F（或者 a~f）。因为十六进制需要两个字符来表示，范围是 00 到 FF。即便小于 16，也必须用两个字符表示，比如我们可以写 05，但绝不能只写个 5。 总之使用 bytes.fromhex 创建时，字符串的长度一定是一个偶数，从前往后每两个分为一组。使用字面量的方式创建时也是如此，比如我们可以写成 b\"\\x01\\x02\"，但不能写成 b\"\\x1\\x2\"。 # 不可以写成 b\"\\x0\"，会报错\nprint(b\"\\x00\") # b'\\x00' # \\x 后面至少跟两个字符，但这里跟了 3 个字符\n# 所以 \\x 会和 61 组合得到 'a'\n# 至于后面的那个 1 就单纯的表示字符 '1'\nprint(b\"\\x611\") # b'a1' 所以 \\x 后面可以跟超过两个以上的字符，超过两个以上的部分会被当成普通字符来处理，与十六进制无关。每个 \\x 只和它后面的两个字符结合，因此 \\x 后面不能少于两个字符。 然后我们通过索引获取的时候，得到的也是一个整数： b = \"古\".encode(\"utf-8\")\nprint(b) # b'\\xe5\\x8f\\xa4'\nprint([b[0], b[1], b[2]]) # [229, 143, 164] 所以 bytes 对象的每个字节都是 0 ~ 255 之间的一个整数，那么问题来了，如果我有每个字节对应的整数，那么如何再转成 bytes 对象呢？ # 里面的每个整数都必须位于 0 ~ 255 之间\nprint(bytes([229, 143, 164]))\nprint(bytes([229, 143, 164, 97, 98, 99]))\n\"\"\"\nb'\\xe5\\x8f\\xa4'\nb'\\xe5\\x8f\\xa4abc'\n\"\"\" print(bytes([229, 143, 164]).decode(\"utf-8\"))\nprint(bytes([229, 143, 164, 97, 98, 99]).decode(\"utf-8\"))\n\"\"\"\n古\n古abc\n\"\"\" 以上就是 bytes 对象的几种创建方式，我们再总结一下。 # 1）通过字面量的方式创建\nprint(b\"hello\") # b'hello'\n# 也可以使用十六进制的 ASCII 码，但要指定 \\x 前缀\n# \\x 会和它后面的两个数字（范围是 0 ~ 9、A ~ F）进行组合，表示一个字符\nprint(b\"\\x61\\x62\\x63\") # b'abc'\n# 除了十六进制之外，还可以使用八进制的 ASCII 码，前缀是 \\\n# \\ 会和它后面的三个数字（范围是 0 ~ 7）进行组合，表示一个字符\n# 97、98、99 对应的八进制为 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