[issue28128] Improve the warning message for invalid escape sequences

[Eric V. Smith]

Eric V. Smith added the comment:

I forgot: this is what Nick's example now looks like:

$ ./python -Wall escape_warning.py
Traceback (most recent call last):
  File "escape_warning.py", line 1, in <module>
    import bad_escape
  File "/home/eric/local/python/cpython/bad_escape.py", line 1
    print('\d')
         ^
SyntaxError: invalid escape sequence \d

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