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Hello Python 3.15, goodbye 3.10, and now I can use 3.11

L3 · BuilderTools & ProductsSimon Willison's Blog· 10/12/2026

Directly addresses performance optimization challenges for developers building AI tools and plugins.

AI Summary

Python 3.15 introduces explicit lazy imports and a sampling profiler that significantly reduce startup time for LLM CLI tools and improve performance profiling.

Excerpt

Shared some notes on Python 3.15, using it with uv, and features from Python 3.11 I'm excited to use now that 3.10 is no longer the minimum supported version for my own projects simonwillison.net/2026/Oct/12/...

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