[issue31975] Add a default filter for DeprecationWarning in __main__

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

> Why would mypy, flake8 or pip emit DeprecationWarnings?

Because they use python features that get deprecated, and the python the user is using to run them gets upgraded.  Now, those particular tools probably will get updated quickly, but other tools will not.

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