[issue4356] Add "key" argument to "bisect" module functions

[Rémi Lapeyre]

Change by Rémi Lapeyre <remi.lapeyre at henki.fr>:


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nosy: +remi.lapeyre
versions: +Python 3.8 -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue4356>
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