Neil Girdhar added the comment:
@gvanrossum is there any reason that subclasshook is implemented by overriding
instead of cooperation? E.g.,:
class Sized(metaclass=ABCMeta):
@classmethod
def __subclasshook__(cls, C):
return (super().__subclasshook__(C) and
any("__len__" in B.__dict__ for B in C.__mro__))
etc. And then Collection does not need to implement subclasshook since its
base classes cooperate?
----------
nosy: +neil.g
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<http://bugs.python.org/issue27598>
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