import telnetlib
HOST = "10.1.1.151"
tn = telnetlib.Telnet(HOST)
tn.open(HOST)
test_var = ["test"]
print test_var
tn_read =  tn.read_very_eager()
print tn_read

$ python test_script.py
  ['test']

>>> tn.read_very_eager()
 'nrUser Name : '

$ python test_script.py
  ['test']
  User Name :

timeout = 3    # seconds
tn_read = tn.read_until('User Name :', timeout)
print repr(tn_read)

import telnetlib
import time

HOST = "10.1.1.151"
tn = telnetlib.Telnet(HOST)
test_var = ["test"]
print test_var
time.sleep(5)
tn_read =  tn.read_very_eager()
print repr(tn_read)

['test']
''

tn = telnetlib.Telnet('library.cedarville.edu')   # any old server will do
tn.set_debuglevel(1)
tn_read =  tn.read_all()
print repr(tn_read)

Telnet(library.cedarville.edu,23): recv 'xffxfdx03'
Telnet(library.cedarville.edu,23): IAC DO 3
Telnet(library.cedarville.edu,23): recv 'xffxfbx03xffxfbx01xffxfdx18xffxfd#xffxfd$xffxfdx1f'
Telnet(library.cedarville.edu,23): IAC WILL 3
Telnet(library.cedarville.edu,23): IAC WILL 1
Telnet(library.cedarville.edu,23): IAC DO 24
Telnet(library.cedarville.edu,23): IAC DO 35
Telnet(library.cedarville.edu,23): IAC DO 36
Telnet(library.cedarville.edu,23): IAC DO 31
Telnet(library.cedarville.edu,23): recv 'rn'
Telnet(library.cedarville.edu,23): recv 'login: '

HOST = "1.1.1.1"
PORT = 30001
TIMEOUT = 3
PASSWD = "cisco"
COMMANDS = ["term len 0","show version","show ip route","show run","!!!end!!!"]

import telnetlib

tn = telnetlib.Telnet(HOST, PORT, TIMEOUT)
#tn.set_debuglevel(1)
tn.write("rnrn")
for cmd in COMMANDS:
    tn.write(cmd+"rn")

print tn.read_until("!!!end!!!rn",3)
tn.close()