code: def main():
      
  
      # if less than required arguments, use the defaults
      if len(sys.argv) < 8:
          print("Usage: %s server_url username password namespace classname "
                "max_open, max_pull" %  sys.argv[0])
          server_url = SERVER_URL
          username = USERNAME
          password = PASSWORD
          namespace = TEST_NAMESPACE
          classname = TEST_CLASS
          max_open = 0
          max_pull = 100
      else:
          server_url = sys.argv[1]
          username = sys.argv[2]
          password = sys.argv[3]
          namespace = sys.argv[4]
          classname = sys.argv[5]
          max_open = sys.argv[6]
          max_pull = sys.argv[7]
  
      print('Parameters: server_url=%s\n username=%s\n namespace=%s\n' \
            ' classname=%s\n max_open=%s,\n max_pull=%s' % \
            (server_url, username, namespace, classname, max_open, max_pull))
  
      # connect to the server
      conn = WBEMConnection(server_url, (username, password),
                            default_namespace=namespace,
                            no_verification=True)
  
      #Call method to execute the enumeration sequence and return instances
      try:
          instances = execute_request(conn, classname, max_open, max_pull)
  
          # print the resulting instances
          for instance in instances:
              print('\npath=%s\n%s' % (instance.path, instance.tomof()))
  
      # handle exceptions
      except CIMError as ce:
          print('Operation Failed: CIMError: code=%s, Description=%s' % \
                (ce.status_code_name, ce.status_description))
          sys.exit(1)
      except Error as err:
          print ("Operation failed: %s" % err)
          sys.exit(1)
  
      return 0
docs: Get arguments and call the execution function