paul j3 added the comment:
If the arg_parts are passed through the same cleanup as the 'text' (and empty
strings removed), then
text = ' '.join(arg_parts)
In that case there would be no need to return both (text, arg_parts).
Parenthesis in the metavar could also create the problem addressed in this
thread, except as noted in http://bugs.python.org/issue18349 that 'text'
cleanup removes them.
nargs='*' or '+' or integer is another way in which [] could be introduced into
the metavar.
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