Armin Rigo added the comment:
Sorry, realized that my pure Python algorithm isn't equivalent to
_PyType_Lookup() --- it fails the staticmethod example of Serhiy. A closer one
would be:
for t in type(a).__mro__:
if '__index__' in t.__dict__:
return t.__dict__['__index__'].__get__(a)()
But it's still not a perfect match. I think right now the only "perfect"
answer is given by workarounds like "range(a).stop"...
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<http://bugs.python.org/issue18712>
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