[Level 3] Use cmd module to create python cli program.

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):
        cmd.Cmd.__init__(self)
        self.user = user
        self.host = host
        self.prompt = "%s@%s:%s> " % (user, host, "system")

    def do_show(self, args):
        print "show"

    def do_quit(self, args):
        return True

$
$ ./cli.py

user@host:main> help

Documented commands (type help ):
========================================
system

Undocumented commands:
======================
help  show quit
user@host:main> system
user@host:system> quit 
user@host:main> quit

$

Wish this helps.
regards,
Stanley Huang