[issue28128] Improve the warning message for invalid escape sequences

[Tim Graham]

Tim Graham added the comment:

I hope the message can be improved for Python 3.6 as the warnings I see when running Django's test suite are rather useless to help find and fix the issues:

cpython/Lib/importlib/_bootstrap.py:205: DeprecationWarning: invalid escape sequence '\:'

Grepping for these characters patterns to try to figure out where they come from is quite difficult.

I did track down one instance in a docstring:
https://github.com/django/django/blob/82f8996785751c413e3b4ac12bf387f781c200d8/django/contrib/gis/maps/google/__init__.py#L41

Is the correct resolution to add an r prefix to the string? It could be nice if the release notes contained some guidance on that.

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nosy: +Tim.Graham

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<http://bugs.python.org/issue28128>
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