pyfuzzy is a framework to work with fuzzy sets and process them with operations of fuzzy logic.
For more information see also the Wikipedia category fuzzy logic.
Some examples can be found at examples. They are not completely documented, but have a source documentation, so one can at least see what's happen there.
There are also some examples which use the Fuzzy Control Language to define their fuzzy systems.
News / Changes
Here some news/changes/highlights in the current version in SVN.
The current release is 0.1.0. There changed several things against the previous release (0.0.2 from 2003), so old stuff probably won't work without adaption.
The most current version can be found in the SVN repository.