[issue28128] Improve the warning message for invalid escape sequences

[R. David Murray]

R. David Murray added the comment:

The error can't be a SyntaxError, it must be a DeprecationWarning.  If you can improve the deprecation warning text, I'd be in favor of calling that a fix to the original feature and put it in 3.6.  The deprecation warning can even say that this will be a SyntaxError some time in the future.

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