Как с помощью Python сделать telnet на Cisco?

import getpass
import sys
import telnetlib

HOST = '172.17.0.42'
#user = raw_input("Enter your remote account: ")
password = "mypass"
user = "mylogin"

tn = telnetlib.Telnet(HOST,23,5)
tn.read_until("Username: ", 5)
tn.write(user + "\n")
if password:
    tn.read_until("Password: ", 5)
    tn.write(password + "\n")

tn.write('sh ver ')

data = '' 
while data.find('#') == -1:
    data = tn.read_very_eager()
print data