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- # 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 TYPE_CHECKING
- if TYPE_CHECKING: # 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", (), {})
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