ruff
ruff — Python Linter & Formatter
ruff (v0.15.12, Apr 2026) is three tools in one Rust binary: linter (ruff check), formatter (ruff format), and dependency analyzer (ruff analyze graph). It replaces Flake8, Black, isort, pyupgrade, and dozens more.
The built-in language server (ruff server) replaces the deprecated ruff-lsp package (archived Dec 2025).
Invocation
uv run ruff ... # Project dependency (pinned version)
uvx ruff ... # One-off (latest)
ruff ... # Global install
Rule Selection — The Critical Decision
Default rules are minimal: only ["E4", "E7", "E9", "F"] — catches syntax errors and undefined names but misses most quality rules. You almost certainly need to extend this.
select vs extend-select
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