41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
# Copyright 2014 Donald Stufft
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import, division, print_function
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import sys
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PY2 = sys.version_info[0] == 2
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PY3 = sys.version_info[0] == 3
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# flake8: noqa
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if PY3:
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string_types = str,
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else:
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string_types = basestring,
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def with_metaclass(meta, *bases):
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"""
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Create a base class with a metaclass.
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"""
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# This requires a bit of explanation: the basic idea is to make a dummy
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# metaclass for one level of class instantiation that replaces itself with
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# the actual metaclass.
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class metaclass(meta):
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def __new__(cls, name, this_bases, d):
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return meta(name, bases, d)
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return type.__new__(metaclass, 'temporary_class', (), {})
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