Ruff 0.16.0 Released with 413 Default Rules

Ruff, the Rust‑based Python linter that has gained traction for its speed and strictness, has released version 0.16.0. The update was announced on the project’s official blog and quickly attracted attention on Hacker News, where it earned 64 up‑votes and ten comments. The new release builds on the foundation of the 0.15 series, adding several rule enhancements, performance improvements, and expanded support for the latest Python releases.

Key changes in 0.16.0 include the introduction of the “W” rule family, which targets unused variables and imports, and the “C” rule set for code complexity metrics. Ruff now performs type‑checking more aggressively, leveraging the mypy‑plugin interface to catch type errors earlier in the linting pass. The team also tightened the integration with the Black formatter, ensuring that Ruff’s suggestions are more consistent with Black’s style guidelines. Benchmarks posted by the maintainers show a 12 % reduction in linting time on large codebases, while the new rule set expands coverage to over 200 linting checks compared to the 150 checks in the previous version.

The community’s response has been largely positive, with many users praising the balance between strict linting and developer ergonomics. The release notes also highlight a number of bug fixes, including a regression in the handling of type‑hints in async functions and a memory‑leak issue that surfaced in earlier builds. As Python developers continue to seek faster, more reliable tooling, Ruff 0.16.0 positions itself as a compelling choice for teams prioritizing code quality without sacrificing build speed.