[issue28128] Improve the warning message for invalid escape sequences

[Eric V. Smith]

Eric V. Smith added the comment:

Sorry for not responding earlier. It's unlikely I'll have time for this before beta 2, although I can probably get to it after that and before beta 3. Don't let me stop someone else from improving on the patch.

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