[issue14034] Add argparse howto

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

13850 (already mentioned above) is my relevant argparse docs proposal - it turns out the other argparse issues I remembered posting were actual feature requests rather than docs suggestions (FWIW, those are 14037 and 14039)

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<http://bugs.python.org/issue14034>
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