from collections import *
class C(object):
def __iter__(self): pass
def __contains__(self, i): pass
def __len__(self): pass
def __getitem__(self, i): pass
issubclass(C, Mapping) => False
[issubclass(C, cls) for cls in Mapping.__mro__] => [False, True, True, True,
True]
i.e. C does implement Sized, Iterable and Container.
I would have expected that just as issubclass(C, Sized) checks for the presence
of a "__len__" method, issubclass(C, Mapping) would check for the presence of
the three methods required by each immediate superclass?
Antony
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