[issue28128] Improve the warning message for invalid escape sequences

[Eric V. Smith]

Eric V. Smith added the comment:

I'm not in front of a computer at the moment, but the output looks good. Also, my very quick glance at -7.diff's warn_invalid_escape_sequence looks reasonable, although I can't say for sure whether raising the error in PyErr_WarnExplicitObject followed by raising another error in ast_error is absolutely correct (it's outside my expertise).

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