tests/arg_test.py

import argparse

def div_lister(_num, _res):
    if _num % 2 == 0:
#         print(2)
        return True
    return _res

def pars_hnd(*args):
    return 'nothing downloaded'
    
parser = argparse.ArgumentParser()
# parser.add_argument('-n', action='store_false')
parser.add_argument('-d', action='store_const', const=div_lister, dest='cmd')
parser.add_argument('-integ', type=int)
parser.add_argument('-integ2', type=int)
parser.add_argument('-n', action='store_const', const=pars_hnd, dest='cmd')
# sp = parser.add_subparsers(dest='cmdstr')
# sp1 = sp.add_parser('-d')
# sp1.set_defaults(cmd=div_lister(2))
# sp2 = sp.add_parser('-n')
# sp2.set_defaults(cmd=lambda: 'not downloading')

# print(parser.argument_default)
args = parser.parse_args()  # ['-integ=2', '-integ2=6', '-d']
print(args.cmd(args.integ, args.integ2))
# print(args)
# print(args.d)
# print(div_lister(2))