I've just started using the argparse subparser feature, and it's very nice. However, I'd love to be able to group the different subparser commands into different sections the way I can group ordinary arguments with add_argument_group().

Initially I thought just calling "parser.add_subparsers()" multiple times with different "title" values would work, but argparse doesn't currently like that - it errors out with "cannot have multiple subparser arguments".

I propose that instead of treating this case as an error, argparse should treat it as a way for defining subparser groups - there would still only be a single subparser argument accepted, but the individual commands would appear grouped appropriately in the help output.