Pyrefly is described as 'Type checker and language server for Python, which provides lightning-fast type checking along with IDE features such as code navigation, semantic highlighting, and code completion. It is available as a command-line tool and a VSCode extension' and is an app in the development category. There are more than 10 alternatives to Pyrefly for a variety of platforms, including Mac, Windows, Linux, Python and SaaS apps. The best Pyrefly alternative is Codacy. It's not free, so if you're looking for a free alternative, you could try Codacy or ty. Other great apps like Pyrefly are PyLint, Coala, PyChecker and PyFlakes.
Mypy is an optional static type checker for Python that aims to combine the benefits of dynamic (or "duck") typing and static typing. Mypy combines the expressive power and convenience of Python with a powerful type system and compile-time type checking.
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SideCI is an automated code reviewing tool with GitHub. Speed up your code review and development cycle to improve productivity without requiring engineers to spend valuable time.
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