RPython is a subset of Python that is used to build PyPy. If you want more information on it, I would do some reading on the structure of PyPy. To be clear, th

RPython is a subset of Python that is used to build PyPy. If you want more information on it, I would do some reading on the structure of PyPy. To be clear, this isn't "Ruby running on top of Python." This is "Ruby specified in RPython."