Teaching Myself Python. How Can I Stop The Program From Closing :)

Question

I wrote a program today that will log into a router here at work and check if the line protocols are up and if i can see thir mac address.  If i run it from the IDLE program it works fine.  When i run it as just crosnet.py it runs fine but closes before i can see the output.  I imagine there is some simple line that will have run and just sit?  Or even better, loop back to the beginning and wait for me to give it a new number to then telnet with.
#import getpass
import sys
import telnetlib
HOST = "111.111.111.111"
password = "password"
vpc = raw_input("Enter The VPC Number: ")
#password = getpass.getpass()
tn = telnetlib.Telnet(HOST)
#tn.read_until("login: ")
#tn.write(user + "\n")
#if password:
tn.read_until("Password: ")
tn.write(password + "\n")
#tn.write("sh int atm6/0.vpc\n")
tn.write("sh int atm6/0." + str(vpc) + "\n")
tn.write("sh arp | in " + str(vpc) + "\n")
#tn.write("exit\n")
print tn.read_all()
Sorry the code is bad, dont know python and i was shown a outline of how to telnet and adjusted it to my needs.

Answer 1

while True:
and just indent everything else under it
Ends when you press ^C.
if you wish to have a way to break out of the loop, say, when you press enter at the VPC number without entering anything, add the following after your vpc input:
if not vpc:
break
which will break out of the while loop and end your program.
Last edited by buttons (2007-12-14 22:03:06)