Python to JavaScript converter

You can actually run a Python interpreter directly in JS thanks to emscripten.

The project is called empythoned:

Empythoned is a build script that uses Emscripten to compile CPython for use in a browser. It attempts to compile the main interpreter as a single small executable and the whole standard library as dynamically loaded libraries.

but be warned:

The project is in its infancy. Right now the core interpreter works very well, but many of the libraries either don't work at all or contain various bugs.

You should try this:

http://gatc.ca/projects/pyjsdl/

It works fine with regular python and even supports pygame.