Cursor Rules: Python — Clean Code with AI

Rules Include

Style

• PEP 8 compliance with 88-char line length (Black formatter)
• Type hints on all function signatures
• Google-style docstrings
• f-strings over .format() or %

Patterns

• Dataclasses and Pydantic models over plain dicts
• Context managers for resource handling
• Generators for large data processing
• pathlib.Path over os.path

Testing

• pytest with fixtures and parametrize
• Arrange-Act-Assert pattern
• Mock external dependencies, not internal logic

Modern Python (3.12+)

• Match statements for complex conditionals
• type keyword for type aliases
• Exception groups with except*