removed python3.7 stdlib compats

b2/_internal/_utils/python_compat.py

@@ -10,8 +10,6 @@
 """
 Utilities for compatibility with older Python versions.
 """
-import functools
-import shlex
 import sys
 
 if sys.version_info < (3, 9):
@@ -21,34 +19,3 @@ def removeprefix(s: str, prefix: str) -> str:
 
 else:
     removeprefix = str.removeprefix
-
-if sys.version_info < (3, 8):
-
-    class singledispatchmethod:
-        """
-        singledispatchmethod backport for Python 3.7.
-
-        There are no guarantees for its completeness.
-        """
-
-        def __init__(self, method):
-            self.dispatcher = functools.singledispatch(method)
-            self.method = method
-
-        def register(self, cls, method=None):
-            return self.dispatcher.register(cls, func=method)
-
-        def __get__(self, obj, cls):
-            @functools.wraps(self.method)
-            def method_wrapper(arg, *args, **kwargs):
-                method_desc = self.dispatcher.dispatch(arg.__class__)
-                return method_desc.__get__(obj, cls)(arg, *args, **kwargs)
-
-            method_wrapper.register = self.register
-            return method_wrapper
-
-    def shlex_join(split_command):
-        return ' '.join(shlex.quote(arg) for arg in split_command)
-else:
-    singledispatchmethod = functools.singledispatchmethod
-    shlex_join = shlex.join