Bayesian kids content filtering in Python?

[Gregory (Grisha) Trubetskoy]

I've been snooping around the web for open source kids filtering software.
Something that runs as an http proxy on my home firewall and blocks
certain pages based on content.

It occured to me that this might be an interesting project to be done in
Python, probably using the same training and scoring mechanism that
spambayes uses.

Anyway - I wonder if anyone has already tried something like this?

Grisha