code: def get_value_tuple(self):
          
          retval = tuple()
          for val in self.VALUES:
              retval += (getattr(self, val),)
          return retval
docs: Returns a tuple of the color's values (in order). For example,
          an LabColor object will return (lab_l, lab_a, lab_b), where each
          member of the tuple is the float value for said variable.