[issue20970] contradictory documentation for prog option of argparse

[R. David Murray]

R. David Murray added the comment:

You missed the part where it says "no matter where it is called from".  That is, the path is stripped off.  The sentence could be changed to emphasize that ("the :ref:`~os.basename` of sys.argv[0]").

The backslash is indeed a bit odd and probably should be changed.

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nosy: +r.david.murray
versions: +Python 2.7, Python 3.4, Python 3.5

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