[issue16468] argparse only supports iterable choices

[paul j3]

paul j3 added the comment:

I just submitted a patch to http://bugs.python.org/issue11874 which rewrites _format_actions_usage().  It now formats the groups and actions directly, keeping a list of these parts.  It no longer has to cleanup or split a usage line into parts.  So it is not sensitive to special characters (space, [] or ()  ) in the choices metavar.

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<http://bugs.python.org/issue16468>
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