pyfuzz is a random program generator for python. It was developed to test the JIT compiler of Unladen Swallow. Website and repository: http://bitbucket.org/ebo/pyfuzz/ Execute pgen-example.py to generate a new random program and output it to stdout. Execute pygen-example.py to test a python binary. You must specify a base and a test binary using the -b and -t commandline options. The pygen directory contains a module to represent a python program as an object tree and transform it into a text representation.