Argparse"ArgumentError: argument -h/--help: conflicting option string(s): -h, --help"

argparse adds --help and -h options by default. If you don't want to use the built-in help feature, you need to disable it with:

parser = argparse.ArgumentParser(add_help=False)

See the documentation

The same error pop-ups in 2 other scenarios:

1) Repeated code

parser.add_argument('-h',
                        '--help',
                        action='store_true',
                        help=argparse.SUPPRESS)

parser.add_argument('-h',
                        '--help',
                        action='store_true',
                        help=argparse.SUPPRESS)

2) When you execute the code multiple times on the same kernel

I'm leaving it just in case if someone had simillar problem.