per-file-ignore / extend-per-file-ignore for ruff format to deactivate only certain rules for certain files

[dmrauch]

Hi all,

I'd like to exclude line length checking/fixing from ruff format for Jupyter notebooks synced to .py files with jupytext. These files are located in specific folders, which I use to deactivate only certain linting rules:

[tool.ruff.lint.extend-per-file-ignores]
"examples/*.py" = ["D100", "D102", "E402", "E501"]
"notebooks/*.py" = ["D100", "D102", "E402", "E501"]

Unfortunately, this doesn't seem possible for the formatting part. On the other hand, I don't want to completely exclude these files from formatting per se and I don't want to increase the line length for all files either. Would anybody be aware of a way of doing this?

Thanks so much!

[dhruvmanila]

Hey,

The formatter doesn't expose many config options similar to the linter. The rules infrastructure is specific to the linter. There's more context on this here: #18486, #11143.

For your specific use case, you could possibly change the format.lint-length value for all the files in a specific directory using the extend config.

[dmrauch]

Cool, many thanks for the quick answer and the helpful pointers! I'll add a ruff.toml with sth like

extend = "../pyproject.toml"
line-length = 200

in both the examples/ and the notebooks/ folder.