[issue27364] Deprecate invalid unicode escape sequences

[Guido van Rossum]

Guido van Rossum added the comment:

I think ultimately it has to become an error (otherwise I wouldn't
have agreed to the warning, silent or not). But because there's so
much 3rd party code that depends on it we indeed need to take
"several" releases before we go there.

Contacting the PyCQA folks would also be a great idea -- can anyone
volunteer to do so?

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<http://bugs.python.org/issue27364>
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