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Sure, and also they haven't even finished implementing the language, and what they do implement mostly isn't faster than cpython yet, for the very sensible reason that they're focusing on functionality before speed. Definitely not something you'll be deploying in production in the next 6 months; these things take time.
Still, it's pretty exciting that there's someone working on a full python jit and that "run numpy" is not just part of their test suite but IIUC already somewhat functional. If you look at their local patch to numpy, the only really functionality-breaking hack they needed to get it to build/import was to disable numpy.random. Everything else is either working around temporary bugs in pyston, arguable bugs in numpy that cpython lets us get away with but that could be fixed, or minor stuff that would be reasonable to #ifdef in numpy upstream.
-n
Apparently, they still target Python2.7, not Python3.
see https://github.com/dropbox/pyston/blob/master/README.md