[issue31108] add __contains__ for list_iterator (and others) for better performance

[Sergey Fedoseev]

New submission from Sergey Fedoseev:

> python -mtimeit -s "l = list(range(100000))" "l[-1] in l"
1000 loops, best of 3: 1.34 msec per loop
> python -mtimeit -s "l = list(range(100000))" "l[-1] in iter(l)"                                
1000 loops, best of 3: 1.59 msec per loop

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messages: 299666
nosy: sir-sigurd
priority: normal
severity: normal
status: open
title: add __contains__ for list_iterator (and others) for better performance
type: performance

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31108>
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