are you sure that Python-urllib/2.7 isn't a search engine spider?
I received more block e-mail that try to access to my robot.txt page like this:
TYPE: Found Malicious User Agent
DETECTED ATTACK VALUE: Python-urllib/2.7
LOGTIME: 2013-05-03 01:24:14
FROM IP: http://whois.domaintools.com/18.104.22.168
Let me know