01a · Python packaging, environments and project tooling¶
Chapter 1 got you to the point where uv add, uv sync and uv run feel like muscle memory: you can start a project, pin a dependency, and get a working virtual environment without thinking about it. This chapter is about what happens the moment that stops being enough — the day Relay's Python codebase is no longer one script but three packages that have to ship independently and share code; the day a security reviewer asks "can you prove these are the exact bytes that were audited?"; the day someone tries to pip install your internal library and a squatted package on public PyPI wins instead; the day your production image is 900 MB because a re-ranking dependency dragged in a CUDA toolkit nobody's inference node will ever use. …
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