cython-lint
Lint Cython files
Decision gist · record as of 2026-08-14
Yes. cython-lint is actively maintained, has low install friction, carries no security vulnerabilities, and is widely adopted by major scientific Python projects. If you work with Cython code, it fills a real gap that general Python linters leave open. The permissive MIT license removes any legal concern. Install it if you want to catch Cython-specific bugs and style issues early.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction install with four straightforward runtime dependencies (cython, pycodestyle, tokenize-rt, tomli).
- Actively maintained with recent releases; last commit was 2026-08-10 and the project is not archived.
License · maintenance · safety
permissive license (permissive) — Licensed under MIT (permissive), so you can use, modify, and distribute this package freely in both open-source and commercial projects without significant legal restrictions.
last release 2026-06-21 (54 days) · last repo commit 2026-08-10 · 105 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 859,563 downloads/mo, #4,878 on PyPI
Alternatives
Verify before relying
pip install cython-lint
# Command-line usage
cython-lint my_file.pyx
# Or configure in .pre-commit-config.yaml:
# - repo: https://github.com/MarcoGorelli/cython-lint
# rev: v0.21.0
# hooks:
# - id: cython-lint- Whether the tool's Cython-specific checks cover all common pitfalls in production codebases, or if gaps remain.
- Performance characteristics when linting large Cython projects with many files.
- How well the automated fixer (double-quote-cython-strings) integrates with other formatters like black.
What it is and what it does
cython-lint is a static analysis tool that checks Cython (.pyx) files for code quality issues, unused imports, undefined variables, style violations, and Cython-specific problems. It combines pycodestyle checks with custom rules for patterns that are particularly error-prone in Cython code—such as dangerous default values, late-binding closures, and repeated dict keys—and can be run from the command line or integrated into pre-commit workflows.
The tool is designed to catch issues that flake8 historically missed in Cython files. It supports configuration via command-line arguments or a `.cython-lint.toml` / `pyproject.toml` file, allows selective rule ignoring, and includes an automated fixer for quote normalization. Its runtime dependencies are minimal and well-established (cython, pycodestyle, tokenize-rt, tomli), making it straightforward to integrate into existing Python development environments.
Use it for
- Enforce code quality standards in Cython-heavy projects like NumPy, pandas, or scikit-learn before commits.
- Catch unused imports and variables in Cython modules during CI/CD pipelines via pre-commit hooks.
- Identify Cython-specific anti-patterns (late-binding closures, dangerous defaults) that pure Python linters miss.
- Normalize quote style in Cython files across a project using the double-quote-cython-strings fixer.
- Configure project-wide linting rules in pyproject.toml to maintain consistent Cython code style.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
cython-lint is actively maintained, has low install friction, carries no security vulnerabilities, and is widely adopted by major scientific Python projects. If you work with Cython code, it fills a real gap that general Python linters leave open. The permissive MIT license removes any legal concern. Install it if you want to catch Cython-specific bugs and style issues early.
Install
cython-lint on PyPI
Before you install
Low friction install with four straightforward runtime dependencies (cython, pycodestyle, tokenize-rt, tomli). Actively maintained with recent releases; last commit was 2026-08-10 and the project is not archived.
Requires Python 3.10 or later.
License in practice
Licensed under MIT (permissive), so you can use, modify, and distribute this package freely in both open-source and commercial projects without significant legal restrictions.
Quickstart
pip install cython-lint
# Command-line usage
cython-lint my_file.pyx
# Or configure in .pre-commit-config.yaml:
# - repo: https://github.com/MarcoGorelli/cython-lint
# rev: v0.21.0
# hooks:
# - id: cython-lintVerify before relying
- Whether the tool's Cython-specific checks cover all common pitfalls in production codebases, or if gaps remain.
- Performance characteristics when linting large Cython projects with many files.
- How well the automated fixer (double-quote-cython-strings) integrates with other formatters like black.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 4 packagescythonpycodestyletokenize-rttomli |
| Maintenance | Actively maintained 54 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 859,563 / month, #4,878 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3 |
Evidence: cython_lint-0.21.0-py3-none-any.whl
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