R. David Murray added the comment:

Ah, I see.  A link to that issue would have been helpful :).

To summarize for anyone like me who didn't follow that issue: __index__ means 
the object can be losslessly converted to an int (is a true int), while __int__ 
may be an approximate conversion.  Thus it makes sense for an object to have an 
__int__ but not __index__, but vice-versa does not make sense.

Is someone updating the docs to reflect this, or should that be spun off as a 
separate issue as well?

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<http://bugs.python.org/issue20092>
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