PyPy is python implemented in RPython, which is technically a python subset. It's so restricted it might as well be a different language though.

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bjoli 2 hours ago | parent [-]

It is restricted in a way that you would restrict yourself to write high speed software in most languages, and I found it is not that restrictive compared to C that you would have to use if you were to write a fast Python library.

	▲	Doxin an hour ago \| parent [-]
		oh for sure, but I still feel like telling people pypy is written in python is misleading. it's written in something significantly like python, but it's not python.