gistfile1.txt

>>> string = """Namespace Queue Messages
... SJHENT  Alert_Operation_Router  0
... SJHENT  Alert_Process_Router  0
... SJHENT  Alert_Service_Restart  0
... SJHENT  Alert_Service_Router  0
... SJHENT  BadMessageHandler  0
... SJHEDI  EMailAlert  0
... SJHENTPMM  Ens.Actor  0
... BLAHBLAH WOOTWOOT 501"""
>>> lines = string.split('\n')
>>> for line in lines:
...  line = line.strip()
...  if not line:
...   continue
...  parts = line.split()
...  try:
...   if int(parts[-1]) > 500:
...    print line
...  except ValueError:
...   continue
...
BLAHBLAH WOOTWOOT 501