Hi guys how are you 
please why When I run this code it does not work but when I change the (   tn.write(b"config t \n")
tn.write(b"router ospf 10 \n") to the show command it works fine ??
****************************************************************************************************************
import sys    
import telnetlib
import getpass
host=["192.168.1.164","192.168.1.169"]
devno=len(host)
user='ali'
Password='cisco'
for i in range(devno):
    print('*'*50 + ' Connected to device : '+str(host[i]) +'*'*50)
    tn=telnetlib.Telnet(host[i])
    tn.read_until(b'Username: ')
    tn.write(user.encode('ascii')+ b'\n')
    tn.read_until(b'Password')
    tn.write(Password.encode('ascii')+b'\n')
    tn.write(b"config t \n")         if I change to tn.write(b"show ip route \n") it works fine 
    tn.write(b"router ospf 10 \n")  if I change to tn.write(b"show ip inter bri \n") it works fine
    tn.write(b'  exit\n')
    print(tn.read_all().decode('ascii'))
this code is working fine but when I want to send configuration it does not accespt ??

import sys
import telnetlib
import getpass

host=["192.168.1.164","192.168.1.169"]
devno=len(host)
user='ali'
Password='cisco'

 for i in range(devno):
    print('*'*50 + ' Connected to device : '+str(host[i]) +'*'*50)
    tn=telnetlib.Telnet(host[i])
    tn.read_until(b'Username: ')
    tn.write(user.encode('ascii')+ b'\n')
    tn.read_until(b'Password')
    tn.write(Password.encode('ascii')+b'\n')
    tn.write(b"en" + b"\n")
    tn.write(b"terminal length 0\n")
    tn.write(b"show run\n")
    tn.write(b' show ip route\n')
    tn.write(b'  exit\n')
    print(tn.read_all().decode('ascii'))
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