Ethan Furman added the comment:

Ethan Furman previously stated:
-------------------------------
> So the complete list of spcecifiers then is d, i, o, u, U, and c [1], and they
> should work if __index__ works.

Okay, so 'd' then should be considered a conversion operation, whilst the 
others should only work if the object is actually an integer type (which is 
implied by specifying __index__).

In other words

  - if %d or %u is specified, try __int__, then __index__
    (according to the docs, u is obsolete and identical to d)

  - if %i, %o, %x, %X, or %c is specified, try only __index__

Agreed?

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<http://bugs.python.org/issue19995>
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