Python Telnet connection

Question

I was playing around with python 3.1 when I came to a problem. I want to connect to a telnet server. Here is my code:

import sys
import telnetlib

tn = telnetlib.Telnet("10.0.0.138")


tn.read_until(b"Username :", 2)
tn.write(b"\n")

tn.read_until(b"Password :", 2)
tn.write(b"\n")

tn.read_until(b"=>", 2)
tn.write(b"exit\n")

tn.close

It works to read until "Username :". There is also no error message when writing an emty line. But when i read until "Password :" i get an empty string. I also get an empty string when i read all.

Please help me if you can.

EDIT: Here is the output when i connect to the server via putty.

 Willkommen am THOMSON TG787v
   Plattform:VDNT-D  Firmware:8.2.5.0  Seriennummer:CP0919MT238
 Bitte identifizieren Sie sich mit Ihrem Benutzernamen und Kennwort
--------------------------------------------------------------------------------




Username :
Password :
------------------------------------------------------------------------

                             ______  Thomson TG787v
                         ___/_____/\
                        /         /\\  8.2.5.0
                  _____/__       /  \\
                _/       /\_____/___ \  Copyright (c) 1999-2009, THOMSON
               //       /  \       /\ \
       _______//_______/    \     / _\/______
      /      / \       \    /    / /        /\
   __/      /   \       \  /    / /        / _\__
  / /      /     \_______\/    / /        / /   /\
 /_/______/___________________/ /________/ /___/  \
 \ \      \    ___________    \ \        \ \   \  /
  \_\      \  /          /\    \ \        \ \___\/
     \      \/          /  \    \ \        \  /
      \_____/          /    \    \ \________\/
           /__________/      \    \  /
           \   _____  \      /_____\/
            \ /    /\  \    /___\/
             /____/  \  \  /
             \    \  /___\/
              \____\/

------------------------------------------------------------------------
CP0919MT238=>

I pressed return after "Username :" and then after "Password :".

Answer 1

# Script to Telnet in to a host
# For now I have hardcoded the HOST that can be taken as input if required
#run as " python teli.py ""

import time
import telnetlib
HOST ="www.google.com"
tn=telnetlib.Telnet(HOST,"80")
tn.write("GET /index.html HTTP/1.1\nHost:"+HOST+"\n\n")
l=tn.read_all()
print l