Passing a tuple as command line argument

Set nargs of the data argument to nargs="+" (meaning one or more) and type to int, you can then set the arguments like this on the command line:

--data 1 2 3 4

args.data will now be a list of [1, 2, 3, 4].

If you must have a tuple, you can do:

my_tuple = tuple(args.data)

Putting it all together:

parser = argparse.ArgumentParser()
parser.add_argument('--data', nargs="+", type=int)
args = parser.parse_args()
my_tuple = tuple(args.data)