[docs] [issue16011] "in" should be consistent with return value of __contains__

[STINNER Victor]

STINNER Victor added the comment:

Do you need this PEP?
http://www.python.org/dev/peps/pep-0335/

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16011>
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