[issue30969] Docs should say that `x is z or x == z` is used for `x in y` in containers that do not implement `__contains__`

[Cheryl Sabella]

Change by Cheryl Sabella <cheryl.sabella at gmail.com>:


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resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30969>
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