Is there a way to add an already created parser as a subparser in argparse?

Question

Normally, to add a subparser in argparse you have to do:

parser = ArgumentParser()
subparsers = parser.add_subparser()
subparser = subparsers.add_parser()

The problem I'm having is I'm trying to add another command line script, with its own parser, as a subcommand of my main script. Is there an easy way to do this?

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EDIT: To clarify, I have a file script.py that looks something like this:

def initparser():
    parser = argparse.ArgumentParser()
    parser.add_argument('--foo')
    parser.add_argument('--bar')
    return parser

def func(args):
    #args is a Namespace, this function does stuff with it

if __name__ == '__main__':
    initparser().parse_args()

So I can run this like:

python script.py --foo --bar

I'm trying to write a module app.py that's a command line interface with several subcommands, so i can run something like:

python app.py script --foo --bar

Rather than copy and pasting all of the initparser() logic over to app.py, I'd like to be able to directly use the parser i create from initparser() as a sub-parser. Is this possible?

Answer 1

You could use the parents parameter

p=argparse.ArgumentParser()
s=p.add_subparsers()
ss=s.add_parser('script',parents=[initparser()],add_help=False)
p.parse_args('script --foo sst'.split())

ss is a parser that shares all the arguments defined for initparser. The add_help=False is needed on either ss or initparser so -h is not defined twice.