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How do pyproject.toml, tomllib, and uv/pyproject workflows fit together?

Q: How do pyproject.toml, tomllib, and uv/pyproject workflows fit together?

`pyproject.toml` (PEP 621) is the single project file; `tomllib` reads it stdlib, `uv`/`pip` consume `[project]` and `[tool.*]` tables. pyproject.toml tool.uv + [project] | | Old layout | New (PEP 621) | |---|---|---| | Metadata | setup.py / setup.cfg | `[project]` in pyproject.toml | | Deps | requirements.txt | `[project.dependencies]` + `uv.lock` | | Tool config | many dotfiles | `[tool.*]` sections | | Read in code | `tomli` | `tomllib` (3.11+) | | Build | `setup.py` | `pyproject.toml` + hatch/pdm/uv | `[project]`

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pyproject.toml (PEP 621) is the single project file; tomllib reads it stdlib, uv/pip consume [project] and [tool.*] tables.

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