How to let Python code continue after telnet (telnetlib) timeout

Question

I am using Python for Automated telnet program using telnetlib. The problem is: when the device that I am trying to telnet to doesn't responsd, means timeout; the program gives me timeout message and doesn't continue to next commands.

My Code:

import telnetlib  
HOST = ("x.x.x.x")  
USER = ("xxxxx")  
PWD = ("yyyyy")  
ENABLE = ("zzzzz")  
TNT = telnetlib.Telnet(HOST, 23, 5)                    
TNT.read_until(b"Username:")  
TNT.write(USER.encode('ascii') + b"\n")  
TNT.read_until(b"Password:")  
TNT.write(PWD.encode('ascii') + b"\n")  
TNT.write(b"enable\n")  
TNT.read_until(b"Password:")  
TNT.write(ENABLE.encode('ascii') + b"\n")  
TNT.write(b"terminal length 0\n")  
TNT.write(b"show run\n")  
TNT.write(b"exit\n")  
print (TNT.read_all().decode('ascii'))  
TNT.close()  
raw_input ("Press any Key to Quit: ")  

Error Message:

Traceback (most recent call last):  
  File "D:\Python\Telnet (Python 2.7) V1.5.py", line 8, in <module>  
    TNT = telnetlib.Telnet(HOST, 23, 5)  
  File "C:\Python27\lib\telnetlib.py", line 209, in __init__  
    self.open(host, port, timeout)  
  File "C:\Python27\lib\telnetlib.py", line 225, in open  
    self.sock = socket.create_connection((host, port), timeout)  
  File "C:\Python27\lib\socket.py", line 571, in create_connection  
    raise err  
timeout: timed out  
>>> 

How can let the program to just notify me that this device isn't reachable and let it continue with the next commands ??

Answer 1

Wrap the operations in a try block, and handle the exception in a catch block.