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stbi/Lib/site-packages/pip/_vendor/packaging/_compat.py

+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+from __future__ import absolute_import, division, print_function
+
+import sys
+
+from ._typing import MYPY_CHECK_RUNNING
+
+if MYPY_CHECK_RUNNING:  # pragma: no cover
+    from typing import Any, Dict, Tuple, Type
+
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+# flake8: noqa
+
+if PY3:
+    string_types = (str,)
+else:
+    string_types = (basestring,)
+
+
+def with_metaclass(meta, *bases):
+    # type: (Type[Any], Tuple[Type[Any], ...]) -> Any
+    """
+    Create a base class with a metaclass.
+    """
+    # This requires a bit of explanation: the basic idea is to make a dummy
+    # metaclass for one level of class instantiation that replaces itself with
+    # the actual metaclass.
+    class metaclass(meta):  # type: ignore
+        def __new__(cls, name, this_bases, d):
+            # type: (Type[Any], str, Tuple[Any], Dict[Any, Any]) -> Any
+            return meta(name, bases, d)
+
+    return type.__new__(metaclass, "temporary_class", (), {})