500 Lines or Less: A Python Interpreter Written in Python

Byterun is a Python interpreter written in Python that demonstrates how Python's fundamental interpreter structure fits into just 500 lines of code. Created by Dropbox engineers, Byterun replicates CPython's core architecture as a stack-based virtual machine that executes bytecode instructions by manipulating data stacks within frames. The project reveals how Python's dynamic typing requires the interpreter to determine object types and method behaviors at runtime, making optimization challenging since each instruction could potentially execute arbitrary code.