Armin Rigo added the comment:
Just mentioning it here again, but "type(a).__index__(a)" is still not
perfectly correct. Attached is a case where it differs.
I think you get always the correct answer by evaluating "range(a).stop". It's
admittedly obscure... For example:
class A:
def __index__(self):
return -42**100
a = A()
print(range(a).stop)
----------
nosy: +arigo
Added file: http://bugs.python.org/file31334/x.py
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