code: def on_for_rotations(self, left_speed, right_speed, rotations, brake=True, block=True):
          
          MoveTank.on_for_degrees(self, left_speed, right_speed, rotations * 360, brake, block)
docs: Rotate the motors at 'left_speed & right_speed' for 'rotations'. Speeds
          can be percentages or any SpeedValue implementation.
  
          If the left speed is not equal to the right speed (i.e., the robot will
          turn), the motor on the outside of the turn will rotate for the full
          ``rotations`` while the motor on the inside will have its requested
          distance calculated according to the expected turn.