Python: general main() function

main.py

"""Module docstring

This is a placeholder for a long usage message.
"""

import sys
import getopt


def process(arg):
    """ Write a method for argument processing here """
    pass


def main(argv=None):
    """ Main function """

    if argv is None:
        argv = sys.argv

    # Parse commandline options
    try:
        opts, args = getopt.getopt(argv[1:], "h", ["help"])
    except getopt.error, msg:
        print msg
        print "for help use --help"
        sys.exit(2)

    # Process options
    for o, a in opts:
        if o in ("-h", "--help"):
            print __doc__
            sys.exit(0)

    # Process arguments
    for arg in args:
        process(arg)


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