A boilerplate example of a Python CLI program

ExamplePythonCLIProgram.py

# -*- coding: utf-8 -*-
import argparse
import logging
import sys

def main(argv=None):
    argparser = argparse.ArgumentParser(
        description='A boilerplate greeting program!',
    )

    argparser.add_argument(
        '--version',
        action='version',
        version='%(prog)s 0.1.0',
    )

    argparser.add_argument(
        '-v', '--verbose',
        help='Increase output verbosity (add more flags for more verbosity). E.g. "--verbose" or "-vvv"',
        action='count',
        default=0,
    )

    argparser.add_argument(
        'greetings',
        help='A space separated list of greetings in quotes. E.g. "Good morning" "Have a nice day"',
        nargs='+',
    )

    args = argparser.parse_args(argv)

    logging.basicConfig(
        level=logging.DEBUG if args.verbose else logging.INFO,
        format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s',
    )
    logger = logging.getLogger(__name__)

    greetings = args.greetings

    for greeting in greetings:
        logger.debug(f'Printing greeting, {greeting}…')
        print(greeting)


if __name__ == '__main__':
    sys.exit(main())