[issue10424] better error message from argparse when positionals missing

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

FYI, you can upload versions of the same patch with the same name and remove old versions.  The code review tool will remember versions, and it’s easier for human if there’s only one patch.

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versions: +Python 3.3 -Python 3.2

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<http://bugs.python.org/issue10424>
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