[issue31975] Add a default filter for DeprecationWarning in __main__

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I simply don't think developer tools are the prime example of command line
tools (it's just that because we are Python developers here, *everything*
we use tends to be a developer tool). And "app" does not mean or imply "GUI
app".

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