[issue31975] Add a default filter for DeprecationWarning in __main__

[Nick Coghlan]

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

Antoine, I'm a user too, and this single small change will be enough to
solve *my* problems, while still addressing Guido's developer tool
usability concerns that prompted him to change the default in the first
place (see the stdlib-sig thread for more info on that).

If someone else wants a different change, they can write their own
competing PEP that explains why they think mine would be worse than the
status quo.

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