Have you ever wondered how a JIT compiler works? Production quality JIT compilers are large, complicated pieces of software that can seem inscrutable at first glance. However, building a simple JIT compiler is surprisingly easy. We’ll walk through how to build a template-style JIT compiler for Python from first principles, in Python! Slides can be found at: https://speakerdeck.com/pycon2019 and https://github.com/PyCon/2019-slides"