Python Bytes #472 Monorepos
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Mar 9, 2026 A deep dive into managing a Python monorepo with uv workspaces and practical tips for local package workflows. A tour of cattrs for flexible serialization, validation, and converter support. Discussion on learning to program in the AI age and using AI as a tutor. Highlights of a VS Code extension that boosts FastAPI development and deployment.
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Name Root Project Uniquely For UV Workspaces
- Do give the root workspace a distinct project name and mark inter-package deps so UV resolves them locally.
- Brian explains using a top-level pyproject.toml with a different name and tool.uv entries to avoid PyPI lookups for internal packages.
Avoid Test Name Collisions In Monorepos
- Try running pytest in importlib mode or add init files to avoid test name collisions across packages in a monorepo.
- Brian warns duplicate test filenames like test_helpers can silently conflict and recommends importlib mode as a fix.
Keep Validation Separate With Cattrs
- cattrs separates serialization/validation from data classes, letting you parse/unstructure between classes and dicts without coupling models to I/O rules.
- Michael highlights converters for JSON, msgpack, YAML, msgspec, and decorators for custom hooks and validation.