import getpass
import telnetlib

HOST = "10.x.x.x"
user = input("Enter your telnet username: ")
password = getpass.getpass()

tn = telnetlib.Telnet(HOST)

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

tn.write(b"enable\n")
tn.write(b"cisco\n")
tn.write(b"conf t\n")

for n in range (1,11):
    tn.write(b"int loopback" + str(n).encode('ascii') + b"\n")
    tn.write(b"ip address 172.16." + str(n).encode('ascii') + b".1 255.255.255.0" + b"\n")
    tn.write(b"description Loopback Number: " + str(n).encode('ascii') + b"\n")
tn.write(b"end\n")
tn.write(b"exit\n")

print (tn.read_all().decode('ascii'))