learnpy_getopt.py

#!/usr/bin/env python

import getopt, sys

ABNORMAL_STATE=2
EMPTY=""

def hello(name):
    print("Hello, ", name)

def usage():
    print(sys.argv[0], " <-h|--help> <-n|--name> [your name]")

def main():
    name = EMPTY

    try:

        opts, args = getopt.getopt(sys.argv[1:], "hn:", ["help", "name="])
        # opts, args = getopt.gnu_getopt(sys.argv[1:], "hn:", ["help", "name="])

        print("opts: ", opts)
        print("args: ", args)

        for option, value in opts:
            if option in ("-h", "--help"):
                usage()
            elif option in ("-n", "--name"):
                name = value

        if len(opts) == 0:
            usage()

    except getopt.GetoptError as err:
        print(err)
        usage()
        sys.exit(ABNORMAL_STATE)

    if (name != EMPTY):
        hello(name)

if __name__ == "__main__":
    main()