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Toy Python Lisp interpreters based on the 1960 McCarthy paper

Show HN: Toy Python Lisp interpreters based on the 1960 McCarthy paper

9 AI Score
Show_hn Added Apr 12, 2026

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$0
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$0

About

I wrote this set of Python files to try to help programmers understand the original LISP paper, assuming zero mathematical or Lisp knowledge. The original paper is a mind-blowing piece of computer science history for many reasons - I&#x27;d recommend anyone to try and get their head around it.<p>I found plenty of fantastic LISP implementations which stay close to the original paper. But they are all fully-functional, practical implementations. The original paper builds from deeper fundamentals which it would be possible to write code in, albeit very impractical.<p>I implemented these earlier iterations, so programmers can follow the paper step-by-step in a more familiar language than 50s mathematical notation.<p>I am no expert in Lisp or mathematics, and intentionally went into this with no knowledge of Lisp beyond the original paper. I did not write it in the most elegant way, but in the simplest way for me to understand. So please don&#x27;t take this code as a definitive statement on the language.<p>However, this code really helped me to understand the original paper better, and to begin using Lisp with a better grasp of the spirit of the language.<p>I&#x27;d welcome any thoughts from those who have more experience with Lisp or comp sci history.

AI Score Reasoning

This project is a pedagogical hobbyist tool rather than a commercial venture, lacking a viable business model, scalable market, or proprietary technology. While it provides educational value for computer science enthusiasts, it demonstrates no potential for venture-scale returns or market disruption.

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