[issue28128] Improve the warning message for invalid escape sequences

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Searching on GitHub it seems to me that the most frequent issue with supporting Python 3.6 is eliminating or silencing warnings about invalid escape sequences. Any help with this is very important.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28128>
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