[issue40199] Invalid escape sequence DeprecationWarnings don't trigger by default

[Aaron Gallagher]

Aaron Gallagher <_ at habnab.it> added the comment:

This is definitely not windows-specific. On macos:

$ python3.9
Python 3.9.4 (default, Apr  5 2021, 01:47:16)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> '\s'
'\\s'

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nosy: +habnabit

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<https://bugs.python.org/issue40199>
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