import sysdef main():  if len(sys.argv) != 3:    print ‘usage: ./wordcount.py {--count | --topcount} file‘    sys.exit(1)  option = sys.argv[1]  filename = sys.argv[2]  if option == ‘--count‘:    print_words(filename)  elif option == ‘--topcount‘:    print_top(filename)  else:    print ‘unknown option: ‘ + option    sys.exit(1)if __name__ == ‘__main__‘:  main()