[issue13667] __contains__ method behavior

[Alex Gaynor]

Alex Gaynor <alex.gaynor at gmail.com> added the comment:

For what it's worth I proposed this on -ideas a while ago, the sticking points were what does `not in` do (no one had an answer anyone was happy with for this), and do we need a way to override it from the other perspective (e.g. if I want to do `SpecialObj() in [1, 2, 3]`, is there a way to do that?).

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nosy: +alex

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13667>
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