bug in mutual exclusion usage display

[Nullset]

When defining multiple mutual exclusion groups, each successive group
is nested in the previous group's square brackets when printed in the
usage blurb. It does not appear to have any effect on the logic - just
the display.

Example (redacted):

parser = argparse.ArgumentParser(description='...', epilog='...')

prompt_group = parser.add_mutually_exclusive_group()
prompt_group.add_argument('-f','--force', action='store_true')
prompt_group.add_argument('-i', action='store_true', default=True)
prompt_group.add_argument('-I', action='store_true')
prompt_group.add_argument('--interactive', action='store',
metavar='WHEN', choices=['never','once','always'])

dereference_group = parser.add_mutually_exclusive_group()
dereference_group.add_argument('-H', action='store_true')
dereference_group.add_argument('-L','--dereference',
action='store_true')
dereference_group.add_argument('-P','--no-dereference',
action='store_true', default=True)

preserve_root_group = parser.add_mutually_exclusive_group()
preserve_root_group.add_argument('--no-preserve-root',
action='store_true')
preserve_root_group.add_argument('--preserve-root',
action='store_true', default=True)

parser.add_argument('SOURCE', action='append', nargs='+')

When run:
$ prog --help

Produces:

usage: prog [-h]
[-f | -i | -I | --interactive WHEN [-H | -L | -P [--no-
preserve-root | --preserve-root]
SOURCE [SOURCE ...]

...

positional arguments:
SOURCE

optional arguments:
-h, --help show this help message and exit
-f, --force ...
-i ...
-I ...
--interactive WHEN ...
-H ...
-L, --dereference ...
-P, --no-dereference ...
--no-preserve-root ...
--preserve-root ...

...

[Steven Bethard]

On Wed, Oct 13, 2010 at 11:16 AM, Nullset <cxza...@gmail.com> wrote:
> When defining multiple mutual exclusion groups, each successive group
> is nested in the previous group's square brackets when printed in the
> usage blurb. It does not appear to have any effect on the logic - just
> the display.

I believe this is the problem reported here:

http://bugs.python.org/issue9355

As soon as I can get some time for argparse, I'll commit this fix.

Steve
--
Where did you get that preposterous hypothesis?
Did Steve tell you that?
        --- The Hiphopopotamus