[issue12542] Remove duplicates of cmp_to_key used in tests

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset fefb7d355361 by Éric Araujo in branch '3.2':
Remove duplicates of cmp_to_key (#12542, reviewed by Raymond Hettinger)
http://hg.python.org/cpython/rev/fefb7d355361

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nosy: +python-dev

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