Python and Parrot
Parrot is an effort to write the equivalent of .Net's Common Language Runtime or the Java Virtual Machine for dynamically-typed scripting languages. The project is developed by the community working on Perl 6.
See http://www.parrotcode.org and [http://www.vendian.org/parrot/wiki/ the Parrot wiki.]
The Parrot source tree includes some support for Python, but it can't run very significant Python programs yet and no one seems to be actively working on it.
See also: ["Jython"], IronPython, PyPy.