title: How to let Python code continue after telnet (telnetlib) timeout
body: <p>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.</p>
  
  <p>My Code:</p>
  
  <pre><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: ")  
  </code></pre>
  
  <p>Error Message:</p>
  
  <pre><code>Traceback (most recent call last):  
    File "D:\Python\Telnet (Python 2.7) V1.5.py", line 8, in &lt;module&gt;  
      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  
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>How can let the program to just notify me that this device isn't reachable and let it continue with the next commands ??</p>