Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:

> Do you also advocate deprecating PySequence_Check()? 

Perhaps just document PyMapping_Check() as being less informative than before 
(now it has false positives for sequences).

> As for the "clean C version of the ABCs", 
> I'm afraid we could wait quite a bit

That may be true.  I hope not.  The ABCs were meant to solve exactly this 
problem.  At this point, I would rather ignore the problem for 3.2 than to 
implement a less clean alternative.

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<http://bugs.python.org/issue5945>
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