The python file can be downloaded here, or here; if you wish to log your own rooms.

The logs are sorted as: ./chan name/year/month/day.txt

I suggest you run the script to connect to a "real" IRC client.
Why? Because networking isn't perfect. If you lose connection to the server, the script will stop logging.
But!, if it's run through irssi-proxy or some other BNC software, then it will auto-reconnect and continue to parse logs. Yay.

I no longer log rooms for people. Sorry.