python - How to set the argparse subcommand order in the automatic description -


consider following piece of code:

$ cat a.py  import argparse if __name__ == '__main__':     parser = argparse.argumentparser()     subparsers = parser.add_subparsers()      parser_a = subparsers.add_parser('a', help='a')     parser_b = subparsers.add_parser('b', help='b')     parser_c = subparsers.add_parser('c', help='c')      args = parser.parse_args()

and simple invocation:

$ python a.py --help usage: a.py [-h] {a,c,b} ...  positional arguments:   {a,c,b}                 b         b     c         c  optional arguments:   -h, --help  show message , exit

why positional arguments listed {a,c,b} instead of {a,b,c} , how can fix this? have 6 subcommands , looks ugly.

this python 2.7.7 fwiw.

can display (print), subparsers.choices? should ordereddict.

the {} produced .choices attribute of subparsers. while can iterable (list, dictionary, etc), current argparse code makes ordereddict, should display keys in order in added.

i'm not aware of change in behavior, @ least not in past couple of years. dig history.

you can change display giving subparsers metavar value, e.g. 

subparsers = parser.add_subparsers(...., metavar='{a,b,c,d}')

http://bugs.python.org/issue9026

is bug fix set ordereddict. in closed in march 2011.


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