[issue18712] Pure Python operator.index doesn't match the C version.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is updated patch which uses Armin's algorithm for lookup special methods and adds special case for int subclasses in index().

I have no idea how the documentation should look.

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Added file: http://bugs.python.org/file31344/operator_index_3.patch

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