Python in 90 minutes, sample code

hello2.py

#!/usr/bin/env python
"""
hello2.py hello world sample  
Usage: hello2.py [options] 

Options:
  -m messages                   message list, separare by ','
  -h                            this help

Mail bug reports and suggestion to : Larry Cai <larry.caiyu AT gmail.com>
"""

import getopt, sys, os, errno
      
def helloworld(messages):
    print messages

def main(): 
    message = "world"
    try:
        cmdlineOptions, args= getopt.getopt(sys.argv[1:],'hm:',["help","message="])
    except getopt.GetoptError, e:
        raise "Error in a command-line option:\n\t" + str(e)

    for (optName,optValue) in cmdlineOptions:
        if  optName in ("-h","--help"):
            print __doc__
            sys.exit()
        elif optName in ("-m","--message"):
            steps = optValue
        else:
            errorHandler('Option %s not recognized' % optName)

    helloworld(message)
 
if __name__ == "__main__": 
  main()