[issue28128] Improve the warning message for invalid escape sequences

[Emanuel Barry]

Emanuel Barry added the comment:

Besides converting the DeprecationWarning to a Syntax{Error,Warning}, I don't see an easy way to include the offending line (or even file). The place in the code where the strings are created has no idea *where* they are being defined. AIUI, either we special-case this, or we resolve #28028 (but I don't think the latter can go in 3.6).

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assignee: ebarry -> 

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