quest about telnetlib

[张志明]

code below cannt work

import getpass
import sys
import telnetlib
import select

tn = telnetlib.Telnet()

print tn.open("162.105.31.222",23)
print tn.read_eager() 

print "ok"

output is:
------------
None

ok
------------

the host is avaiable,but my python program cannt connect to it ,why?