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

[Steven Bethard]

Changes by Steven Bethard <steven.bethard at gmail.com>:


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assignee:  -> bethard
resolution:  -> fixed
stage: needs patch -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11174>
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