paul j3 added the comment:
Giving the `subparsers` Action a `metavar` might achieve everything the
proposed patch does - without any code changes.
In the 1st test case:
subparsers = parser.add_subparsers(title='subcommands',
description='subcommands
description',
help='subcommands help',
metavar='{1,2}')
and for the 2nd
parser = argparse.ArgumentParser(prog='PROG_ALL',
description='main description')
subparsers = parser.add_subparsers(title='subcommands',
description='subcommands
description',
help='subcommands help',
metavar='{}')
parser1 = subparsers.add_parser('1') # no help
parser2 = subparsers.add_parser('2', aliases=('2alias',))
Note that neither the patch nor the metavar affects how the choices are
displayed in an error message, e.g.
usage: PROG [-h] {} ...
PROG: error: argument {}: invalid choice: 'foo' (choose from '1', '2',
'2alias')
For more discussion on formatting of choices see
http://bugs.python.org/issue16468
--------------------
While I'll continue to think about this issue, my tentative suggestion is to
make this a documentation fix, rather than a code change. Just let users know
that `add_subparsers` takes a `metavar` parameter, just like `add_argument`.
It can hide or otherwise customize the listing of commands.
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<http://bugs.python.org/issue22848>
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