[issue31975] Add a default filter for DeprecationWarning in __main__

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I also learned we need more concrete examples of useful PYTHONWARNINGS and -W settings in the docs - I believe PEP 565 currently contains more of those than all of our existing warnings related documentation put together :)

I'll look into that "warnings cookbook" aspect as part of putting a reference patch together for the PEP.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31975>
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