Pylyzer, Joute's Review
Review of Pylyzer, the fast Python static analysis tool. Pricing, alternatives, who it's for.
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Pylyzer in brief
A fast Python static analyzer written in Rust. Impressive performance, but still less mature than Mypy or Pyright. To monitor as it evolves.
- PriceFree
- CategoryCode & Dev
- RecommendedYes
The Essentials
- Python static analyzer written in Rust, very fast
- Free (open source)
- Type checking, error detection, VS Code integration
- For Python developers who want faster static analysis than Mypy
What is Pylyzer?
Pylyzer is a Python static code analyzer written in Rust for performance. It detects type errors, undefined variables, and other common problems in Python code without running it. The main differentiator is its speed: being written in Rust, it's significantly faster than Mypy or Pyright on large codebases. It integrates with VS Code via extension and can be used in CI pipelines. The project is open source and under active development.
Strengths
Exceptional speed
Written in Rust, Pylyzer is one of the fastest Python static analyzers available. On large codebases, the difference with Mypy is significant.
Free and open source
No subscription, no usage limits. MIT license. You can use it in open source or commercial projects without restrictions.
VS Code integration
The VS Code extension provides real-time static analysis during development, without manual command execution.
Limits
Still less mature than Mypy/Pyright
Pylyzer misses some type errors that Mypy or Pyright catch. Type coverage is less exhaustive.
Smaller community
Less documentation, fewer resources online, less community support than established alternatives.
Pricing
Free and open source. Available on GitHub.
Alternatives
For the most complete type checking: Mypy (reference) or Pyright (Microsoft, used by Pylance). For linting in addition: Ruff (also Rust, very fast).
Verdict
Pylyzer is promising for Python developers looking for fast static analysis. It's not yet ready to fully replace Mypy/Pyright, but its speed makes it a valuable complement. Worth watching as the project matures.
FAQ
Does Pylyzer replace Mypy?
Not yet. Pylyzer is faster but less complete in type coverage. Best used alongside Mypy for now.
Is Pylyzer compatible with Python type stubs?
Pylyzer supports PEP 484 type annotations. Support for stubs is evolving. Check pylyzer.dev for current state.
Does Pylyzer work in CI/CD?
Yes, Pylyzer can be used as a CLI in CI/CD pipelines like any static analyzer.
Is Pylyzer compatible with Django/FastAPI?
Compatibility with major frameworks depends on type annotations in those frameworks. Check pylyzer.dev for known limitations.
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Screenshots Pylyzer
4
Pylyzer : 0/10.
A fast Python static analyzer written in Rust. Impressive performance, but still less mature than Mypy or Pyright. To monitor as it evolves..
Test Pylyzer yourself
A free trial is available. Plan thirty minutes to form your own opinion.
Affiliate link. Joute earns a commission at no extra cost to you. Our verdict stays independent.
Pylyzer
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