Simon Willison’s Weblog

19th July 2008 - Link Blog

Simple Top-Down Parsing in Python. Eye-opening tutorial on building a recursive descent parser for Python, in Python that uses top-down operator precedence.

Posted 19th July 2008 at 11:37 pm

Recent articles

Writing about Agentic Engineering Patterns - 23rd February 2026
Adding TILs, releases, museums, tools and research to my blog - 20th February 2026
Two new Showboat tools: Chartroom and datasette-showboat - 17th February 2026

This is a link post by Simon Willison, posted on 19th July 2008.

compilers 17 effbot 4 fredrik-lundh 7 parsing 12 python 1229 recursivedescent 1

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