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- # Copyright 2014 Donald Stufft
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- from __future__ import absolute_import, division, print_function
- import sys
- 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):
- """
- 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):
- def __new__(cls, name, this_bases, d):
- return meta(name, bases, d)
- return type.__new__(metaclass, 'temporary_class', (), {})
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