[issue31975] Add a default filter for DeprecationWarning in __main__

[Nick Coghlan]

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

The default command line UX of Python developer tools is also more unambiguously python-dev's responsibility, though. That's where my own initial line of argument for full reversion (i.e. that we should be letting app developers manage their own stderr UX, not trying to manage it for them) fell down.

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<https://bugs.python.org/issue31975>
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