Cython, in my eyes, would qualify as a "production"-level compiler project - the lxml library uses it, and you occasionally run into it in other projects. Cyth

Cython, in my eyes, would qualify as a "production"-level compiler project - the lxml library uses it, and you occasionally run into it in other projects. Cython follows the "optional static typing" approach, and implements a rather large (but not complete) subset of Python. It's a very good intermediate solution for those 20% of the code that take up 80% of the running time.