code: def set_vibration(self, left_motor, right_motor, duration):
          
          if WIN:
              self._set_vibration_win(left_motor, right_motor, duration)
          elif NIX:
              self._set_vibration_nix(left_motor, right_motor, duration)
          else:
              raise NotImplementedError
docs: Control the speed of both motors seperately or together.
          left_motor and right_motor arguments require a number between
          0 (off) and 1 (full).
          duration is miliseconds, e.g. 1000 for a second.