Mark Dickinson added the comment:

> I should also clarify that Raymond and Mark and responsible for
maintaining most of the algorithmic/data structure code in Python.

Well, Raymond at least.  I plead not guilty; I think you're confusing me with 
someone else. :-)

But for this issue, this mathematician prefers the simple invariant that the 
key function is called exactly once per list item. If your key function doesn't 
work for one of those items for some reason, that sounds like a problem with 
the key function rather than a reason to change the sorting implementation.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24075>
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