def reverse(self):
        """
        Reverse the robot's current motor directions. If the robot is currently
        running full speed forward, it will run full speed backward. If the
        robot is turning left at half-speed, it will turn right at half-speed.
        If the robot is currently stopped it will remain stopped.
        """
        self.left_motor.value = -self.left_motor.value
        self.right_motor.value = -self.right_motor.value
Reverse the robot's current motor directions. If the robot is currently
        running full speed forward, it will run full speed backward. If the
        robot is turning left at half-speed, it will turn right at half-speed.
        If the robot is currently stopped it will remain stopped.