Eryk Sun added the comment:
> the sq_length slot in the weakproxy type is set to proxy_length.
Nice. Its tp_getattro gets in the way of using __len__ directly, but this can
be side stepped by manually binding the descriptor:
class Test(object):
def __len__(self):
return 2**31 + 5
>>> t = Test()
>>> p = weakref.proxy(t)
>>> p.__len__()
2147483653L
>>> type(p).__len__.__get__(p)()
-2147483643
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<http://bugs.python.org/issue26423>
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