argdeclare is a declarative argument configurator for python's argparse.
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argdeclare
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README.md

ardeclare

An implementation of the interface provided by the cmdln module but using argparse to provide the option/arg heavy parsing.

Credit for this code goes foremost to Shakeeb Alireza, code was initially found: argdeclare: declarative interface to argparse

Usage

from argdeclare import Commander, option_group, option, arg

def test():
    # only for options which are repeated across different funcs
    common_options = option_group(
        option('-t', '--type', action='store', help='specify type of package'),
        arg('package', help='package to be (un)installed'),
        option('--log', '-l', action='store_true', help='log is on')
    )

    class Application(Commander):
        'a description of the test app'
        name = 'app1'
        version = '0.1'
        default_args = ['install', '--help']

        @option('--log', '-l', action='store_true', help='log is on')
        @arg('pattern', help="pattern to delete")
        def do_delete(self, options):
            "help text for delete subcmd"
            print(options)

        @option('-f', '--force', action='store_true',
                        help='force through installation')
        @common_options
        def do_install(self, options):
            "help text for install subcmd"
            print(options)

        @common_options
        def do_uninstall(self, options):
            "help text for uninstall subcmd"
            print(options)

    app = Application()
    app.cmdline()

if __name__ == '__main__':
    test()