Only the pypy interpreter is written in RPython, code running in pypy is written in normal python. See http://codespeak.net/pypy/dist/pypy/doc/coding-guide.html

Only the pypy interpreter is written in RPython, code running in pypy is written in normal python. See http://codespeak.net/pypy/dist/pypy/doc/coding-guide.html http://codespeak.net/pypy/dist/pypy/doc/coding-guide.html for more info