[karag]

why ruby innovate and not python ?

[blattimwind]

Cython has/had a mode of operation where it would attempt to compile any module thats imported at runtime, which sound fairly similar to this.

[_ZeD_]

why not both? and btw, you may look at pypy if you like this kind of innovations

[geofft]

In fact, one of the oldest JITted Ruby implementations is Topaz, which was built on top of PyPy (i.e., it's a Python program that uses the PyPy infrastructure to parse/JIT/run Ruby instead of Python).

[sametmax]

Pyscho, Pypy, pyjion...