PyCLIPS is an extension module for the Python language that embeds full CLIPS functionality in Python applications. This means that you can provide Python with a strong, reliable, widely used and well documented inference engine.
Actually, CLIPS is often taken as "reference implementation" of an expert systems shell by many programmers and groups involved in AI development. It has a forward chaining rule-based inference system, as well as all imperative and object-oriented constructs that allow full control the execution flow. PyCLIPS aims at becoming a reliable extension for Python applications, even possibly large ones, that need a rule-based inference engine.