Python pexpect - TIMEOUT falls into traceback and exists,

I'm new to python-pexpect. In Tcl/expect when I hit a timeout - I would respond with message and exit the function. I have tried to experiment with similar response using sample code posted
http://pexpect.svn.sourceforge.net/viewvc/pexpect/trunk/pexpect/examples/sshls.py?revision=489&view=markup

I based on this code above - if I give a bogus password, I would expect this to just timeout, print "ERROR!", and exit program. But when I run it - goes into a 'Traceback output (see below), can someone help me to get the program to print "ERROR" and exit program gracefully.

test@ubuntu:~/scripts$ ./tmout.py 
 Hostname: 192.168.26.84
 User: root
 Password: 
 Timeout exceeded in read_nonblocking().
 <pexpect.spawn object at 0xb77309cc>
 version: 2.3 ($Revision: 399 $)
 command: /usr/bin/ssh
 args: ['/usr/bin/ssh', '-l', 'root', '192.168.26.84', '/bin/ls', '-l']
 searcher: searcher_re:
     0: EOF
 buffer (last 100 chars): 
 Permission denied, please try again.
 root@192.168.26.84's password: 
 before (last 100 chars): 
 Permission denied, please try again.
 root@192.168.26.84's password: 
 after: <class 'pexpect.TIMEOUT'>
 match: None
 match_index: None
 exitstatus: None
 flag_eof: False
 pid: 14997
 child_fd: 3
 closed: False
 timeout: 30
 delimiter: <class 'pexpect.EOF'>
 logfile: None
 logfile_read: None
 logfile_send: None
 maxread: 2000
 ignorecase: False
 searchwindowsize: None
 delaybeforesend: 0.05
 delayafterclose: 0.1
 delayafterterminate: 0.1
 Traceback (most recent call last):
   File "./tmout.py", line 54, in <module>
     traceback.print_exc()
 NameError: name 'traceback' is not defined
 test@ubuntu:~/scripts$ 
 

Source Code:

#!/usr/bin/env python
 
 """This runs 'ls -l' on a remote host using SSH. At the prompts enter hostname,
 user, and password.
 
 $Id$
 """
 
 import pexpect
 import getpass, os
 
 def ssh_command (user, host, password, command):
 
     """This runs a command on the remote host. This could also be done with the
 pxssh class, but this demonstrates what that class does at a simpler level.
 This returns a pexpect.spawn object. This handles the case when you try to
 connect to a new host and ssh asks you if you want to accept the public key
 fingerprint and continue connecting. """
 
     ssh_newkey = 'Are you sure you want to continue connecting'
     child = pexpect.spawn('ssh -l %s %s %s'%(user, host, command))
     i = child.expect([pexpect.TIMEOUT, ssh_newkey, 'password: '])
     if i == 0: # Timeout
         print 'ERROR!'
         print 'SSH could not login. Here is what SSH said:'
         print child.before, child.after
         return None
     if i == 1: # SSH does not have the public key. Just accept it.
         child.sendline ('yes')
         child.expect ('password: ')
         i = child.expect([pexpect.TIMEOUT, 'password: '])
         if i == 0: # Timeout
             print 'ERROR!'
             print 'SSH could not login. Here is what SSH said:'
             print child.before, child.after
             return None       
     child.sendline(password)
     return child
 
 def main ():
 
     host = raw_input('Hostname: ')
     user = raw_input('User: ')
     password = getpass.getpass('Password: ')
     child = ssh_command (user, host, password, '/bin/ls -l')
     child.expect(pexpect.EOF)
     print child.before
 
 if __name__ == '__main__':
     try:
         main()
     except Exception, e:
         print str(e)
         traceback.print_exc()
         os._exit(1)
 

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