Using argparse for command line argument parsing in python

argparse.py

import argparse
import logging

def main():
    parser = argparse.ArgumentParser(description="Example")

    parser.add_argument('-v', '--verbose', action='store_true', help="Verbose output")

    parser.add_argument('--size', nargs='*', default=[256], type=int, choices=[256,512,768,1024], help="Data sizes (default = 256)")

    parser.add_argument('--csv', nargs='?', default='off', choices=['on', 'off'], help='CSV mode (default = off)')

    args = parser.parse_args()

    if args.verbose:
        logging.basicConfig(level=logging.INFO)

    for size in args.size:
        # do something
        continue

if __name__ == "__main__":
    main()

# Sample output ...
#
# usage: tmp.py [-h] [-v] [--size [{256,512,768,1024} [{256,512,768,1024} ...]]]
#                            [--csv [{on,off}]]
#
# Example
#
# optional arguments:
#       -h, --help                      show this help message and exit
#       -v, --verbose                   Verbose output
#       --size [{256,512,768,1024} [{256,512,768,1024} ...]]
#                                                   Data sizes (default = 256)
#       --csv [{on,off}]            CSV mode (default = off)