PySTEMM is a tool and model library for building executable concept models using a functional-programming style (immutable objects and pure functions).

See EuroSciPy 2013 proceedings for a paper with details. Here are some snippets, with all visualizations generated automatically by PySTEMM:

PySTEMM requires these open-source modules to be installed:

• traits (Enthoughts Traits)
• inflect (for narrative text generation)
• appscript (for AppleScript interface to drawing app)
• inspect (to manipulate classes, methods, source code)
• numpy, pylab (for numerical integration, graph plots)
• pylpsolve (for integer linear programming solver)

Visualization requires OmnigrafflePro on OSX.