[Python-Dev] Proposal: go back to enabling DeprecationWarning by default

[Guido van Rossum]

To cut this thread short, I say we should use Nick's proposal to turn these
warnings on for __main__ but off elsewhere. (See
https://mail.python.org/pipermail/python-dev/2017-November/150364.html.)

-- 
--Guido van Rossum (python.org/~guido)
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