python实现的telnet客户端程序，python自带一个telnetlib模块，可以通过其Telnet类实现telnet操作

import getpass 
import sys 
import telnetlib 
   
HOST = "hostname" 
   
user = raw_input("Enter your remote account: ") 
   
password = getpass.getpass() 
   
tn = telnetlib.Telnet(HOST) 
   
tn.read_until("login: ") 
   
tn.write(user + "\n") 
   
if password: 
    tn.read_until("Password: ") 
    tn.write(password + "\n") 
   
tn.write("ls\n") 
   
tn.write("exit\n") 
   
print tn.read_all()