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Python is much more complex than Lua. In fact, one of Lua's greatest features is it's extreme and elegant simplicity.

I believe it is a lot harder to make a Python jitter. And it would never be as fast as a Lua jitter.

There is a JIT for python: http://pypy.org/

And although the article doesn't state that PyPy is a JIT, it's one of the implementations that the author tries to obtain a speedup.

CPython 3.6 has a frame evaluation api, specifically for JIT integration

Pyston is the only CPython JIT currently however