How to use cmd module to create python cli program? Please refer to the following sample: $ cat ./cli.py #!/usr/bin/python import os, sys from menu.CLI_main import CLI_main ###################################### main if __name__ == '__main__': cli=main("user","host") cli.cmdloop() $ $ cat ./main.py import cmd class main(cmd.Cmd): def __init__(self, user, host): cmd.Cmd.__init__(self) self.user = user self.host = host self.prompt = "%s@%s:%s> " % (user, host, "main") def do_system(self, args): from system import system sub_cmd = system(self.user, host) sub_cmd.cmdloop() def help_system(self): print "system sub menu of cli" def do_show(self, args): print "show" def do_quit(self, args): return True $ $ cat ./system.py import cmd class system(cmd.Cmd): def __init__(self, user, host):