[issue28128] Improve the warning message for invalid escape sequences

[Nick Coghlan]

Nick Coghlan added the comment:

Petr, is there any chance you or someone from your team could take a look at this and the other issue Emanuel referenced? These warnings are likely to pose a usability problem when upgrading Python in Fedora in their current state, so it would be good to see them addressed prior to the 3.6.0 release.

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nosy: +encukou

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