[issue22047] argparse improperly prints mutually exclusive options when they are in a group

[Sam Kerr]

New submission from Sam Kerr:

The following code:

   import argparse
   parser = argparse.ArgumentParser()
   group1 = parser.add_mutually_exclusive_group()
   group2 = group1.add_mutually_exclusive_group()
   group2.add_argument('-hello',action='store_true', help="A flag")
   args = parser.parse_args()

produces this output:

   skerr at gravel:~$ python bug.py -h
   usage: bug.py [-h] [[-hello]

   optional arguments:
        -h, --help  show this help message and exit
        -hello      A flag
   skerr at gravel:~$ 

Note the double [[ around hello, but there is no double ]] to close it. This is the error.

----------
components: Library (Lib)
messages: 223744
nosy: Sam.Kerr
priority: normal
severity: normal
status: open
title: argparse improperly prints mutually exclusive options when they are in a group
type: behavior
versions: Python 2.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22047>
_______________________________________