python实现的telnet客户端程序

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())