Python vs. Lisp -- please explain

[Paul Rubin]

"Kay Schluehr" <kay.schluehr at gmx.net> writes:
> I talked to Richard Emslie recently and he told me that the PyPy team
> works on a mechanism to create CPython-extension modules written in
> RPython i.e. a statically translateable subset of Python. So even
> without dynamic code specialization there will be an optimization path
> based on the PyPy toolchain that is amazing. 

Sounds great but is that a whole lot different from pyrex?