Lesson 50 - Dynamic Execution.ipynb

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 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
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   "source": [
    "x = 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
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      "text/plain": [
       "2"
      ]
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     "metadata": {},
     "execution_count": 2
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   "source": [
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "exec(\"x * 2\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "metadata": {},
     "execution_count": 4
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   ],
   "source": [
    "eval(\"x * 2\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "output_type": "error",
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<string>, line 1)",
     "traceback": [
      "Traceback \u001b[1;36m(most recent call last)\u001b[0m:\n",
      "  File \u001b[0;32m\"C:\\ProgramData\\Miniconda3\\lib\\site-packages\\IPython\\core\\interactiveshell.py\"\u001b[0m, line \u001b[0;32m3437\u001b[0m, in \u001b[0;35mrun_code\u001b[0m\n    exec(code_obj, self.user_global_ns, self.user_ns)\n",
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-5-a8f6eec26a75>\"\u001b[1;36m, line \u001b[1;32m2\u001b[1;36m, in \u001b[1;35m<module>\u001b[1;36m\u001b[0m\n\u001b[1;33m    eval(\"x *= 3\")\u001b[0m\n",
      "\u001b[1;36m  File \u001b[1;32m\"<string>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    x *= 3\u001b[0m\n\u001b[1;37m      ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "exec(\"x *= 3\")\n",
    "eval(\"x *= 3\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "metadata": {},
     "execution_count": 6
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   "source": [
    "x"
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  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": [
      "22\n"
     ]
    }
   ],
   "source": [
    "exec(\"import random\\nprint(random.randint(1,100))\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "output_type": "error",
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<string>, line 1)",
     "traceback": [
      "Traceback \u001b[1;36m(most recent call last)\u001b[0m:\n",
      "  File \u001b[0;32m\"C:\\ProgramData\\Miniconda3\\lib\\site-packages\\IPython\\core\\interactiveshell.py\"\u001b[0m, line \u001b[0;32m3437\u001b[0m, in \u001b[0;35mrun_code\u001b[0m\n    exec(code_obj, self.user_global_ns, self.user_ns)\n",
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-8-026e58129837>\"\u001b[1;36m, line \u001b[1;32m1\u001b[1;36m, in \u001b[1;35m<module>\u001b[1;36m\u001b[0m\n\u001b[1;33m    eval(\"import random\\nprint(random.randint(1,100))\")\u001b[0m\n",
      "\u001b[1;36m  File \u001b[1;32m\"<string>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    import random\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "eval(\"import random\\nprint(random.randint(1,100))\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": [
       "10"
      ]
     },
     "metadata": {},
     "execution_count": 9
    }
   ],
   "source": [
    "eval(\"random.randint(1,100)\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": [
      "Windows_NT\n"
     ]
    }
   ],
   "source": [
    "eval(input())\n",
    "# exec(\"import os\\nprint(os.environ[\\\"OS\\\"])\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": [
      "4*(4**3) = 256\n"
     ]
    }
   ],
   "source": [
    "# calculator\n",
    "import re\n",
    "calculation = input(\"Enter a calculation:\").strip()\n",
    "if re.match(r\"^[0-9 \\-+*/()]+$\",calculation):\n",
    "    print(calculation,\"=\",eval(calculation))\n",
    "else:\n",
    "    raise RuntimeError(\"Invalid calculation\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ]
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