New submission from paul j3:
As discussed in issue 16468, a metavar may be used to provide an alternative
representation of a choices option. However if a metvar like 'range(20)' is
used, usage formatter strips off the '()'.
>>> parser.add_argument('foo', type=int,
choices=range(20), metavar='range(0,20)')
>>> parser.format_usage()
# expect: 'usage: PROG [-h] range(0,20)\n'
# actual: 'usage: PROG [-h] range0,20\n'
This is done by a line in the help formater that removes excess mutually
exclusive group notation:
HelpFormatter._format_actions_usage
...
text = _re.sub(r'\(([^|]*)\)', r'\1', text)
A solution is to change this line to distinguish between a case like ' (...)'
and 'range(...)'
text = _re.sub(r'( )\(([^|]*)\)', r'\1\2', text)
----------
files: metaparen.patch
keywords: patch
messages: 192222
nosy: paul.j3
priority: normal
severity: normal
status: open
title: argparse usage should preserve () in metavars such as range(20)
Added file: http://bugs.python.org/file30754/metaparen.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18349>
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