[issue31975] Add a default filter for DeprecationWarning in __main__

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> And I'll repeat: I'm entirely happy with the "revert the change for __main__ only" compromise, since it covers all the cases I care about.

And that's what I'm unhappy with.  We should either revert the change for all code, or not revert it at all.

Such a middle ground is just a wishy-washy decision-by-committee compromise.  It will satisfy almost nobody (neither the people who don't want to see deprecation warnings, nor the ones who don't to miss them), is more complicated to remember, and will most certainly have to be revisited in a couple of years.

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