That said, it's not the best think to piggyback on for languages, because as of recent a lot of the optimizations are really fine-tuned for Python, and popular Python libraries like Django and Twisted.
It's also very nice for other languages too, because it implements the Python stdlib only, and I'm not quite sure how easy or possible "moving stuff around" (i.e. merge os and os.path or separate them even further) would be.
There's some implementations here, including a gameboy emulator: https://codespeak.net/viewvc/pypy/lang/
That said, it's not the best think to piggyback on for languages, because as of recent a lot of the optimizations are really fine-tuned for Python, and popular Python libraries like Django and Twisted.
It's also very nice for other languages too, because it implements the Python stdlib only, and I'm not quite sure how easy or possible "moving stuff around" (i.e. merge os and os.path or separate them even further) would be.