Error in github actions when using `use_pyproject: true`

[Nao-Y1996]

Error in github actions when using `use_pyproject: true`

[JelleZijlstra]

Thanks @bobwhitelock!

I don't think Black should attempt to parse the Poetry-specific section in pyproject.toml. However, I would support adding a note in the docs to address this issue.

[bobwhitelock]

I ran into the same issue, but I think it's not actually a bug as the action is operating as documented, though it is a bit of a gotcha when using this with Poetry.

The docs say: "To read the version from the pyproject.toml file instead, set use_pyproject to true. This will first look into the tool.black.required-version field, then the project.dependencies array and finally the project.optional-dependencies table."

The first suggestion is a Black-specific location, and then the other 2 are standard pyproject.toml locations as described in https://peps.python.org/pep-0621/. The issue is Poetry does not follow PEP 621 (yet - see python-poetry/roadmap#3), and so it stores its dependencies in different locations - tool.poetry.dependencies and similar, and so the Black action cannot use the Poetry-specified version without redundancy.

If you add

[tool.black]
required-version = "24.4.2"

to your pyproject.toml file instead then use_pyproject will work as described.

Longer term the solution might be to note this gotcha in the docs, for Black to pick up on the Poetry syntax as well, and/or to just wait for Poetry to follow PEP 621.