Python argparse boilerplate

main.py

"""
@author: Carlo Pires <[email protected]>
"""
import argparse


class Commands(object):
    def status(self, args):
        print('status for {}'.format(args.module))

    def reset(self, args):
        print('reset for {}'.format(args.module))

    def disable(self, args):
        print('disable for {}'.format(args.module))

    def enable(self, args):
        print('enable for {}'.format(args.module))

    def reload(self, args):
        print('reload for {}'.format(args.module))


if __name__ == '__main__':
    cmd = Commands()

    mod_name_optional = argparse.ArgumentParser(add_help=False)
    mod_name_optional.add_argument('--module', default='all',
                                   metavar='<module name>')

    mod_name_required = argparse.ArgumentParser(add_help=False)
    mod_name_required.add_argument('module', metavar='<module name>')

    def opt(parser, op_name, op_help, mod_opt):
        op = parser.add_parser(op_name, parents=[mod_opt], help=op_help)
        op.set_defaults(func=getattr(cmd, op_name))

    parser = argparse.ArgumentParser()
    sp = parser.add_subparsers()

    opt(sp, 'status', 'show the states of modules', mod_name_optional)
    opt(sp, 'reset', 'reset the state for a module', mod_name_required)
    opt(sp, 'enable', 'enable a module', mod_name_required)
    opt(sp, 'disable', 'disable a module', mod_name_required)
    opt(sp, 'reload', 'reload a modified module', mod_name_required)

    args = parser.parse_args()
    args.func(args)