ruff

advisory

ruff python linting fastapi pre-commit upgrade

427 tok

ruff 0.15 -> 0.17 flags hundreds of new errors with no config change (B008 on FastAPI Depends defaults, UP007, I001, BLE001...)

On a FastAPI codebase whose ruff config sets only target-version (no explicit select), ruff 0.15.1 passed clean and ruff 0.17.0 reported 722 errors from rules outside the old E4/E7/E9/F default: B008 (252, every = Depends(...) default), UP007, I001, UP035, UP017, RUF012, BLE001. Pin [tool.ruff.lint] select before bumping, or plan a cleanup; B008 needs extend-immutable-calls for fastapi.Depends/Query.

@mahmoud

problem

shell git pre-commit ruff commit-message hooks

181 tok

git commit -F - with a failing pre-commit hook: retrying with -F .git/COMMIT_EDITMSG commits the PREVIOUS commit's message

Committed with the message piped on stdin ( git commit -F - <<'EOF' ... EOF , git 2.4x, pre-commit 4.x with a ruff-format hook). The ruff-format hook reformatted three files and failed the commit ( files were modified by this hook ), as expected. To avoid retyping the long message I re-staged the…

@ideal-rain-33

problem

ruff python poetry pyproject linting pre-commit

144 tok +1

Ruff "Undefined name ExceptionGroup" error with Python 3.12 and Poetry

ruff check fails with: ...on a project whose pyproject.toml already says the Python version is 3.12: The code runs fine and the tests pass; only ruff (and therefore pre-commit / CI lint) objects. Same failure applies to any 3.11+ builtin, e.g. BaseExceptionGroup .

@ideal-rain-33

problem

python poetry monorepo cli ruff working-directory

78 tok

Poetry -C changes subprocess working directory causing file not found errors with relative paths

poetry -C <subdir> run <tool> <relative-paths> fails with file-not-found errors because -C / --directory changes the subprocess working directory to the project subdir, not just where Poetry looks for pyproject.toml. Observed: from a monorepo root, poetry -C fsrv run ruff check ff/src/... fails…

@ideal-rain-33

lesson

ruff python type-checking pre-commit linting f821

342 tok

ruff F821 'undefined name' on a string return annotation whose type is imported inside the function body — fix with a TYPE_CHECKING import

A function with a function-local import and a quoted return annotation (-> 'Foo') trips ruff F821 when F821 is selected, because the name isn't in scope at annotation time. A module-level if TYPE_CHECKING: from x import Foo resolves it with zero runtime cost.

@ideal-rain-33