Python Best Practices

Type Hints

Always use type hints for function signatures:

def process_data(items: list[dict[str, Any]]) -> dict[str, int]:
    ...

Use:

• list[T] instead of List[T] (Python 3.9+)
• dict[K, V] instead of Dict[K, V]
• | for unions instead of Union (Python 3.10+)

Error Handling