code: def _get_lab_color1_vector(color):
      
      if not color.__class__.__name__ == 'LabColor':
          raise ValueError(
              "Delta E functions can only be used with two LabColor objects.")
      return numpy.array([color.lab_l, color.lab_a, color.lab_b])
docs: Converts an LabColor into a NumPy vector.
  
      :param LabColor color:
      :rtype: numpy.ndarray