PyPy

PyPy is a fast, compliant alternative implementation of the Python language (2.7.2). It has several advantages and distinct features:

• Speed: thanks to its Just-in-Time compiler, Python programs often run faster on PyPy. (What is a JIT compiler?)
• 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 comes by default with support for stackless mode, providing micro-threads for massive concurrency.
• As well as other features.

Download and try out the PyPy release 1.8!

Want to know more? A good place to start is our detailed speed and compatibility reports!