paul j3 added the comment:
The patch with a major rewrite of '_format_actions_usage' handles this usage
problem correctly:
usage: try_para_in_meta.py [-h] input_file(s) [input_file(s) ...]
The error is the result of usage group formatter trying to remove excess `()`.
To give an idea of what is happening I replaced the missing () with {}.
input_file(s) [input_file(s) ...]
input_file{s) [input_file(s} ...]
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11874>
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