● What is PyPy? ● A framework for writing interpreters using a restricted form of Python called RPython ● A JITing Python interpreter written in Python using RPython and the framework above ● Why use PyPy? ● Fast (6x faster than CPython on average thanks to JIT) ● Compliant (No deal-breaking language changes) ● Compatible (Many C extensions work out-of-the-box) ● Memory usage (Goodbye ref-counting) ● Coming soon: STM and the Death of the GIL ● How can I help? ● Use PyPy! ● Port non-working libraries and extensions to PyPy! ● Donate towards Py3K, STM, NumPy and general PyPy progress! ● Promote PyPy!