[issue31918] Don't let all python code modify modules

[Марат Нагаев]

New submission from Марат Нагаев <sidorovmarat1995 at gmail.com>:

import os
os="os"
#I think it's bad, os and other modules constants

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title: D -> Don't let all python code modify modules

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31918>
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