Function either_dict_or_kwargs

xarray/namedarray/utils.py:184–200

(
    pos_kwargs: Mapping[Any, T] | None,
    kw_kwargs: Mapping[str, T],
    func_name: str,
)

def either_dict_or_kwargs(
    pos_kwargs: Mapping[Any, T] | None,
    kw_kwargs: Mapping[str, T],
    func_name: str,
) -> Mapping[Hashable, T]:
    if pos_kwargs is None or pos_kwargs == {}:
        # Need an explicit cast to appease mypy due to invariance; see
        # https://github.com/python/mypy/issues/6228
        return cast(Mapping[Hashable, T], kw_kwargs)

    if not is_dict_like(pos_kwargs):
        raise ValueError(f"the first argument to .{func_name} must be a dictionary")
    if kw_kwargs:
        raise ValueError(
            f"cannot specify both keyword and positional arguments to .{func_name}"
        )
    return pos_kwargs


def _get_chunk(  # type: ignore[no-untyped-def]