[issue13667] __contains__ method behavior

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Well, usually what you want *is* a boolean indicating whether the element is in the collection or not.

Being able to overload "in", mostly for metaprogramming purposes, is a request that probably nobody thought of when implementing "in".

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nosy: +benjamin.peterson, pitrou -docs at python
versions:  -Python 3.2

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