Python argparse: Make at least one argument required

Question

I\'ve been using argparse for a Python program that can -process, -upload or both:

parser = argparse.ArgumentParser(de         


        

Answer 1

If not the 'or both' part (I have initially missed this) you could use something like this:

parser = argparse.ArgumentParser(description='Log archiver arguments.')
parser.add_argument('--process', action='store_const', const='process', dest='mode')
parser.add_argument('--upload',  action='store_const', const='upload', dest='mode')
args = parser.parse_args()
if not args.mode:
    parser.error("One of --process or --upload must be given")

Though, probably it would be a better idea to use subcommands instead.