Template (outline) for a Python3 script.

py3_script_template.py

#!/usr/bin/env python3
"""Python3 script template."""
import argparse


def run(args):
    pass


def parse_arguments():
    parser = argparse.ArgumentParser()
    parser.add_argument('--arg1', default=1)
    args = parser.parse_args()
    return args


if __name__ == '__main__':
    args = parse_arguments()
    run(args)