Terry J. Reedy <tjre...@udel.edu> added the comment:

An application *can* change warnings.  See lib/idlelib/run for an example.  
Library code should not make changes as they will be global or overwritten.  A 
project that is both can restrict the changes to when run as main module.

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nosy: +terry.reedy

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42075>
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