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

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

This is what I'd like to do: In builtin oct/hex check if the special
method is declared. If it is, Py3k warn and use it. If not, check if we
can do it the Py3k way (with PyNumber_ToBase). Sound good?

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nosy: +benjamin.peterson

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