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Formalizing CPython
2026-11-10AI agents formalized CPython’s internals in 613,318 lines of Lean, validating each component against real Python behavior. The effort surfaced 418 bug reports along the way.

AI agents formalized CPython’s internals in 613,318 lines of Lean, validating each component against real Python behavior. The effort surfaced 418 bug reports along the way.
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