{"library":"ruff","title":"Ruff","description":"Extremely fast Python linter and formatter written in Rust by Astral. Current version is 0.15.7. Two separate subcommands: ruff check (linting, replaces Flake8/isort/pyupgrade) and ruff format (formatting, replaces Black). Not a Python library to import — CLI tool only. The format setting and RUFF_FORMAT env var were repurposed/removed; use output-format and RUFF_OUTPUT_FORMAT instead. 2026 style guide introduced in 0.15.0 changes lambda formatting.","language":"python","status":"active","last_verified":"Tue May 19","install":{"commands":["pip install ruff"],"cli":{"name":"ruff","version":"ruff 0.15.13"}},"imports":["# ruff is a CLI tool — not a Python library to import\n# Two separate subcommands:\n\n# Linting (replaces flake8, isort, pyupgrade, etc.)\nruff check .                  # lint all files\nruff check . --fix            # lint and auto-fix safe issues\nruff check . --unsafe-fixes   # also apply unsafe fixes\n\n# Formatting (replaces Black)\nruff format .                 # format all files\nruff format . --check         # check only, no changes\n\n# Configuration in pyproject.toml:\n# [tool.ruff]\n# line-length = 88\n# [tool.ruff.lint]\n# select = [\"E\", \"F\", \"B\", \"I\"]\n# [tool.ruff.format]\n# quote-style = \"double\""],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"# Install\npip install ruff\n\n# Lint all Python files in current directory\nruff check .\n\n# Lint with auto-fix\nruff check . --fix\n\n# Format all Python files\nruff format .\n\n# Check formatting without modifying (for CI)\nruff format . --check\n\n# Minimal pyproject.toml config\n# [tool.ruff]\n# line-length = 88\n# target-version = \"py311\"\n#\n# [tool.ruff.lint]\n# select = [\"E\", \"F\", \"B\", \"I\", \"UP\"]\n# ignore = [\"E501\"]\n#\n# [tool.ruff.format]\n# quote-style = \"double\"\n# indent-style = \"space\"\n\n# Pre-commit hook (pin the version!)\n# - repo: https://github.com/astral-sh/ruff-pre-commit\n#   rev: v0.15.7\n#   hooks:\n#     - id: ruff-check\n#       args: [--fix]\n#     - id: ruff-format","lang":"bash","description":"ruff check for linting, ruff format for formatting. 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