command-line options and arguments using getopt

Question

I'm trying to write a piece of code in python to get command-line options and arguments using getopt module. Here is my code:

import getopt
import sys

def usage ():
    print('Usage')

def main():
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'xy:')
    except getopt.GetoptError as err:
        print(err)
        usage()
        sys.exit()

    for o,a in opts:
        if o in ("-x", "--xxx"):
            print(a)
        elif o in ("-y", "--yyy"):
            print(a)
        else:
            usage()
            sys.exit()

if __name__ == "__main__":
    main()

The problem is that I can't read the argument of option x, but I can read the argument of y. What should I do to fix this?

Answer 1

Try getopt.getopt(sys.argv[1:], 'x:y:')

http://docs.python.org/library/getopt.html

Parses command line options and parameter list. args is the argument list to be parsed, without the leading reference to the running program. Typically, this means sys.argv[1:]. options is the string of option letters that the script wants to recognize, with options that require an argument followed by a colon (':'; i.e., the same format that Unix getopt() uses).