5 ms·

Not sure about Ruby but pypy is a pure Python implementation of Python: https://www.pypy.org/ https://www.pypy.org/

• dralley 4y ago
  It's not the implementation that 99.9% of people use, though.
  • Kranar 4y ago
    The original poster never claimed that it was; the only claim is that good programming languages have implementations in that language.