[issue11174] add argparse formatting option to display type names for metavar

[Filip Gruszczyński]

Filip Gruszczyński <gruszczy at gmail.com> added the comment:

Well, since you are the designer of the package, I believe you have better knowledge on how to extend it :-). I just provided a patch according to what you described in the first message. Anyway having separate help formatter seems better than bloating parser's constructor.

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<http://bugs.python.org/issue11174>
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