[docs] [issue16418] argparse with many choices can generate absurdly long usage message

[paul j3]

paul j3 added the comment:

In the patch I just posted to http://bugs.python.org/issue16468 I address this long list issue in several ways:

In the Usage line, the metavar gives the user an alternative

In the expanded help line the user can just omit the '%(choices)s' 

In _check_value(), I implemented a numpy like summarize format for choice lists longer than 15   '{1,2,3,...,18,19}'.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16418>
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