Ruff Has a Free Python Linter — 100x Faster Than Flake8, Written in Rust

A Python project had Flake8, isort, pyupgrade, autoflake, and Black. Five tools, five configs, five CI steps. Linting took 45 seconds on CI.

Ruff replaces ALL of them. Written in Rust, it is 10-100x faster. 800+ rules. One tool, one config.

What Ruff Offers for Free

• 800+ Rules - Covers Flake8, isort, pyupgrade, pydocstyle, and more
• 100x Faster - Lints entire CPython codebase in 0.3 seconds
• Formatter - Black-compatible code formatting
• Auto-Fix - Automatically fixes most violations
• Import Sorting - isort-compatible import organization
• Type Checking - Basic type stub checking
• pyproject.toml - Single config file

Quick Start

pip install ruff
ruff check .        # lint
ruff format .       # format
ruff check --fix .  # auto-fix

GitHub: astral-sh/ruff - 35K+ stars

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