Type Hints

Optional annotations describing expected types — checked by tools like mypy and Pyright, ignored at runtime.

Easy

def ohms(v: float, i: float) -> float:
    return v / i

readings: list[float] = []
config: dict[str, int | None] = {}

Hints improve editor autocomplete and catch bugs before running. Libraries like Pydantic also use them for runtime validation.

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