PyPy is a fast, compliant alternative implementation of the Python language (2.7.1). It has several advantages and distinct features: - Speed: thanks to its Just-in-Time compiler, Python programs often run faster on PyPy. - Memory usage: large, memory-hungry Python programs might end up taking less space than they do in CPython. - Compatibility: PyPy is highly compatible with existing python code. It supports ctypes and can run popular python libraries like twisted and django. - Sandboxing: PyPy provides the ability to run untrusted code in a fully secure way. - Stackless: PyPy can be configured to run in stackless mode, providing micro-threads for massive concurrency. - As well as other features. WWW: http://pypy.org/