code: def to_native_units(self, motor):
          
          assert abs(self.degrees_per_second) <= motor.max_dps,\
              "invalid degrees-per-second: {} max DPS is {}, {} was requested".format(
              motor, motor.max_dps, self.degrees_per_second)
          return self.degrees_per_second/motor.max_dps * motor.max_speed
docs: Return the native speed measurement required to achieve desired degrees-per-second