Fast lookup of value from 1-dimensional ndarray.

        Notes
        -----
        Only use this if you know what you're doing.

def set_value(self, arr, key, value):
        """
        Fast lookup of value from 1-dimensional ndarray.

        Notes
        -----
        Only use this if you know what you're doing.
        """
        self._engine.set_value(com.values_from_object(arr),
                               com.values_from_object(key), value)