Python Pro skill: what it does and how to install it

What it does. Analyses the codebase, designs typed interfaces, implements Python with dataclasses and structured error handling, then adds pytest fixtures and mocking. It validates the result with mypy --strict, Black and Ruff, using focused guidance for typing, async programming, testing and packaging.

When to use it. For Python applications that need type annotations, async I/O, robust tests, performance work or package structure. It targets Python 3.11+ and requires test coverage above 90%, but does not support untyped public APIs or ignored strict type errors.