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If in doubt, delete the uv.lock file.

Simon Willison's WeblogAnalysis or commentary·
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Simon Willison says he has been encountering occasional confusing Python dependency errors since switching to Python 3.15, and his rule is to delete the uv.lock file when in doubt.

Written by AI from Simon Willison's Weblog's published text.

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“I've been getting the occasional confusing Python dependency error since switching over to Python 3.15 and the rule I'm having to remember is: If in doubt, delete the uv.lock file Most of my projects are libraries which don't include a uv.lock file, since…”
Simon Willison's Weblog, 01 Nov 2026, 23:24.

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