[issue11707] Create C version of functools.cmp_to_key()

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

[Question from python-list]
Would a C version only be for 3.3 or backported to 3.2 and 2.7. The rationale for backport to 2.7 is that .cmp_to_key was added to 2.7 to aid transition to 3.x. A faster version would make use in 2.7 more inviting.

I understand that there is concern that performance enhancements may have unforseen effects.

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nosy: +terry.reedy

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