Eli Bendersky • 2/5/2026

Rewriting pycparser with the help of an LLM

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This technical article details the author's experience using the LLM Codex to rewrite the popular pycparser library, a pure-Python C language parser. It explains the motivation for moving away from the PLY (YACC) parser generator to a hand-written recursive-descent parser, citing benefits in maintainability, performance, and reducing dependency issues. The post covers the challenges of the original implementation and the collaborative process with the AI coding agent.

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#Python #parsing #llm
Rewriting pycparser with the help of an LLM

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