Login to network device

Login to network device using Telnet in Python script:
=======================================================

import getpass
import sys
import telnetlib

host= "10.10.10.20"
user= raw_input ("Enter your username: ")
password = getpass.getpass()

tn = telnetlib.Telnet(host)

tn.read_until("Username")
tn.write(user + "\n")
if password:
   tn.read_until("Password")
   tn.write(password + "\n")

tn.write("enable\n")
tn.write("vpn123\n")
tn.write("vlan database\n")
tn.write("vlan 30 name TEST30\n")
tn.write("vlan 40 name TEST40\n")
tn.write("vlan 50 name TEST50\n")
tn.write("exit\n")
tn.write("conf t\n")
tn.write("int vlan 30 \n")
tn.write("ip address 30.1.1.1 255.255.255.0\n")
tn.write("int vlan 40 \n")
tn.write("ip address 40.1.1.1 255.255.255.0\n")
tn.write("int vlan 50 \n")
tn.write("ip address 50.1.1.1 255.255.255.0\n")
tn.write("interface fa 1/0\n")
tn.write("description Testing\n")
tn.write("ip address 30.30.30.0 255.255.255.0\n")
tn.write("end\n")
tn.write("exit\n")

print(tn.read_all())