This library is intended to encapsulate the IRC protocol at a quite 
low level.  It provides an event-driven IRC client framework.  It has  
a fairly thorough support for the basic IRC protocol and CTCP, but DCC 
connection support is not yet implemented. It actually does CTCP
parsing exactly as the CTCP specifications describe it.

WWW: http://sourceforge.net/projects/python-irclib/