(How to Write a (Lisp) Interpreter (In Python))
Summary
Peter Norvig's Lispy article explains how to implement a Lisp/Scheme interpreter in Python, covering parsing, evaluation, environments, and a two-stage approach (Lispy Calculator and a fuller Lispy). It demonstrates lexical scoping, closures, and an extensible environment, with REPL examples and a complete walkthrough of the interpreter's core components.