From FAQ[1]: > Psyco was a module that monkeypatched CPython to add a custom JIT compiler. Pyjion wants to introduce a proper C API for adding a JIT compiler t

From FAQ[1]: > Psyco was a module that monkeypatched CPython to add a custom JIT compiler. Pyjion wants to introduce a proper C API for adding a JIT compiler to CPython instead of monkeypatching it. It should be noted the creator of Psyco went on to be one of the co-founders of PyPy. [1] https://github.com/tonybaloney/pyjion#psyco https://github.com/tonybaloney/pyjion#psyco