[issue2337] Backport oct() and hex() to use __index__

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

@Georg:

That is a possibility. Would need to add the proper Py3K warning to the 
current builtins, though.

@Benjamin:

You don't want to warn if it will work for Py3K, so don't warn if 
__index__ is used.

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