Simon Willison’s Weblog

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10th November 2025

Research uv-run-flow-analysis — Running `uv run myscript.py` in a directory with a `pyproject.toml` launches a multi-phase workflow that automates Python script execution within an isolated, dependency-managed environment. uv scans for project metadata, resolves and validates interpreter and package requirements, manages virtual environments, locks dependencies with a TOML-based `uv.lock` file using the PubGrub algorithm, efficiently syncs the environment with parallel downloads and caching, and finally executes the desired…

This is a beat by Simon Willison, posted on 10th November 2025.

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