21 lines
982 B
Python
21 lines
982 B
Python
def with_metaclass(meta, *bases):
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# This requires a bit of explanation: the basic idea is to make a
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# dummy metaclass for one level of class instantiation that replaces
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# itself with the actual metaclass. Because of internal type checks
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# we also need to make sure that we downgrade the custom metaclass
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# for one level to something closer to type (that's why __call__ and
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# __init__ comes back from type etc.).
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#
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# This has the advantage over six.with_metaclass in that it does not
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# introduce dummy classes into the final MRO.
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# :copyright: (c) 2014 by Armin Ronacher.
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# :license: BSD, see LICENSE for more details.
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class metaclass(meta):
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__call__ = type.__call__
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__init__ = type.__init__
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def __new__(cls, name, this_bases, d):
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if this_bases is None:
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return type.__new__(cls, name, (), d)
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return meta(name, bases, d)
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return metaclass('temporary_class', None, {})
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