ruff

ruff

Checks Python code for mistakes and style problems and reformats it, written in Rust for speed. For Python developers who want a linter and a formatter in one tool.

Made by astral-sh on GitHub. These notes are Mindket's, written from its README; the project's own files and license are in its repository.

About

What it is: Ruff is a linter and code formatter for Python, written in Rust. A linter checks code for mistakes and style problems, and a formatter tidies its layout. The project describes it as extremely fast.

Who it suits: Ruff suits Python developers who want one tool to check and tidy their code, and teams that care about a shared style.

Industry | Who uses it | How they use it | Example
Software development | Python developers | Check code for mistakes and style problems | Scanning a project's files before a code review
Data science | Analysts who write Python | Keep the layout of scripts tidy | Cleaning up an analysis script before sharing it
Education | Python teachers | Point out where code departs from the PEP 8 style guide | Showing a student which lines break the style guide
Open source | Maintainers | Keep contributions in one style | Applying the same formatting to every contributed file

Developers who write no Python can skip it.

How to set it up: The notes show one way to get the project, which is to copy its code with git.

1. Copy the code with git from the project's GitHub page.
2. Follow the setup in its README.

For newcomers and experts: A linter reads your Python code and points out likely mistakes and style problems, and a formatter rewrites the layout for you. A first small thing to try is checking one script you already have.

Ruff is written in Rust, and the project leads with speed in its one line description. Its topics point to static analysis and to style guides such as PEP 8, so its checks sit in the same area as other Python linters.

Good to know: This kit holds notes and a pointer to the code, so nothing runs by itself. The README text here is short, so check the repository for rules and options.

• License: MIT
• Cost to run: none named
• Data it reaches: none named
• Not for: code in languages other than Python, since the notes describe a Python tool

On GitHub, 7 November 2026

• Stars: 50,705 (169 that day)
• Forks: 2,613
• Watching: 156
• Open issues and pull requests: 2,255
• Language: Rust
• License: MIT
• Topics: linter, pep8, python, python3, ruff, rust, rustpython, static-analysis, static-code-analysis, style-guide, styleguide
• Trending: #17 repository of the day on GitHub trending (7 November 2026)

Links

• Code: https://github.com/astral-sh/ruff
• Website: https://docs.astral.sh/ruff
• Releases: https://github.com/astral-sh/ruff/releases
• Issues: https://github.com/astral-sh/ruff/issues
• Star history: https://www.star-history.com/#astral-sh/ruff&Date

Get the code

git clone https://github.com/astral-sh/ruff.git

Then follow the setup in its README. Nothing in this kit runs by itself.