[issue28128] Improve the warning message for invalid escape sequences

[Roundup Robot]

Roundup Robot added the comment:

New changeset 259745f9a1e4 by Eric V. Smith in branch 'default':
Issue 28128: Print out better error/warning messages for invalid string escapes.
https://hg.python.org/cpython/rev/259745f9a1e4

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nosy: +python-dev

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