Norvig releases minimal Lisp interpreter tutorial for Python

Peter Norvig published "How to Write a (Lisp) Interpreter (in Python)" on 21 June 2026, walking through a complete Scheme interpreter implementation in under 100 lines. The tutorial covers lexing, parsing, and evaluation for a substantial Lisp subset. Norvig's compressed design—representing environments as dicts, procedures as closures—makes the evaluation loop transparent, offering engineers practical insight into how minimal interpreters work.