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mypy is a static type checker for Python that analyzes source code without executing it, catching type errors early in development. It implements PEP 484-style type hints and supports gradual typing, allowing untyped or partially typed modules to coexist with statically typed code. The tool integrates with common editors and CI systems, and offers a daemon mode for fast, incremental checks across large codebases. Advanced configuration via mypy.ini or pyproject.toml enables per-module strictness, plugin hooks for popular libraries, and fine-grained control of inference and error reporting. Documentation covers everything from newcomer guides to strict mode recipes and release notes. The ecosystem includes typed stubs, third-party plugins, and broad community support that makes mypy a default choice for large Python projects.
Features
- Gradual typing with PEP 484 type hints
- Fast incremental checks via daemon mode
- Rich configuration with per-module strictness
- IDE and CI integrations for continuous feedback
- Plugin system and third-party library stubs
- Detailed reports and error codes for large projects
Project Samples
Categories
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MIT LicenseFollow MyPy
User Reviews
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I’ve been using MyPy to add static type checking to Python projects, and it’s made a noticeable difference in code quality. It helps catch subtle bugs that would otherwise slip into runtime, especially in larger codebases where assumptions are easy to miss. There is a learning curve, particularly if you’re new to type hints or working with older code that wasn’t written with typing in mind. Early on, the number of warnings can feel excessive, but once things are configured properly, it becomes a very helpful safety net. MyPy is especially valuable for team projects and long-term maintenance, where consistency matters. It takes some effort to adopt, but the payoff is worth it
