def converter_tuple(obj) -> tuple:
    """
    Convert input to a tuple. ``None`` will be converted to an empty tuple.

    Parameters
    ----------
    obj: Any
        Object to convert.

    Returns
    -------
    obj: Tuple[Any]
        Tuple.
    """
    if obj is None:
        return ()
    elif hasattr(obj, "__iter__") and not isinstance(obj, (str, bytes)):
        return tuple(x for x in obj)
    else:
        return (obj,)