PyPy is far more than just 'python with a JIT'. It's a tool that allows you to write an entire interpreter in RPython (a subset of Python) and then have it bui

PyPy is far more than just 'python with a JIT'. It's a tool that allows you to write an entire interpreter in RPython (a subset of Python) and then have it build a native binary with a free jit compiler included, with the specifics of your language encoded within. The reference implementation for this project is a Python interpreter. It's seriously, seriously cool.