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

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Windows
nosy: +paul.moore, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40199>
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