9. Putting it all together!

You now know how to fix Reeborg. So, you have to do it. In your library, define a new class of robots, using the following outline as a model:

class RepairedRobot(UsedRobot):

    def __init__(self, x=1, y=1, orientation='e', tokens=0, leaky=False):
        pass

    def turn_right(self, no_frame=False):
        pass

    def turn_around(self):
        pass

    def is_facing_south(self):
        pass

    def is_facing_east(self):
        pass

    def is_facing_west(self):
        pass

    def face_south(self):
        pass

    def face_east(self):
        pass

    def face_north(self):
        pass

    def face_west(self):
        pass

    def left_is_clear(self):
        pass

Then, you can test your code by running the following program (you should probably just copy it from here and paste the result in the Python editor.)

import my_lib
select_challenge("repaired")
think(0)

class TestRobot(RepairedRobot):
    def follow_left_wall(self):
        if self.left_is_clear():
            self.turn_left()
            self.move()
        elif self.front_is_clear():
            self.move()
        elif self.right_is_clear():
            self.turn_right()
        else:
            self.turn_around()

    def follow_right_wall(self):
        if self.right_is_clear():
            self.turn_right()
            self.move()
        elif self.front_is_clear():
            self.move()
        elif self.left_is_clear():
            self.turn_left()
        else:
            self.turn_around()

reeborg = TestRobot(leaky=True)


while not reeborg.token_here():
    reeborg.follow_left_wall()

while not reeborg.object_here() == "star":
    reeborg.follow_right_wall()
reeborg.turn_left()

while not reeborg.object_here() == "triangle":
    reeborg.move()

reeborg.move()
reeborg.move()
reeborg.face_east()
reeborg.move()
reeborg.face_west()
reeborg.move()
reeborg.move()

while not reeborg.is_facing_south():
    reeborg.turn_left()
reeborg.move()
reeborg.turn_right()

while not reeborg.object_here() == "square":
    reeborg.move()

reeborg.face_north()
while not reeborg.at_goal():
    reeborg.move()

The result should look like the image below. Pay close attention to the details of the trace left by the oil leak and make sure your result looks identical.

9.1. Congratulations!

I assume that you did manage to reproduce the image above. If so, you have made much progress in understanding Object-Oriented Programming using Python and are ready to move on to another tutorial.