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PyPy is still not fully Py3K ready. I'd expect MesaPy to only have built on a stable version of PyPy.

It is, insofar as any PyPy is ever "fully ready."

The latest PyPy3 release targets 3.5.3.

PyPy 3.6.1 was released and is very usable, the next release will be 3.6.9

3.6 releases are "beta quality," which I agree is very usable but not "fully ready." as per grandparent.