# My utility robot class
class MyRobot(UsedRobot):
    def turn_around(self):
        self.turn_left()
        self.turn_left()
        
    def turn_right(self):
        for i in range(3):
            self.turn_left()


# class for setting up pins in a bowling arrangement
class PinWorker(MyRobot):
# function to set up a standard set of bowling pins
# preconditions: at location of "head" pin w/10 beepers facing North
# postconditions: at right edge of "fifth" row facing north.
#   This is 4 ave's east and 4 streets north of head pin.
    def setUpPins(self):
        for i in range(4):
            self.layRow(i)
    
# function to lay a  row of pins
# preconditions: At right edge of row to lay facing north
# postconditions: At right edge of row i+1 facing north
    def layRow(self, cnt):
        self.turn_left()
        for i in range(cnt+1):
            self.put_beeper()
            self.move()
            self.move()
        self.turn_around()
        for i in range((2*(cnt+1))+1):
            self.move()
        self.turn_left()
        self.move()


# program to set up bowling pins
bob = PinWorker(1,1,'E', 10)
bob.set_trace_style(colour='white')

# move bob to starting location
for i in range(5):
    bob.move()
bob.turn_left()
bob.move()
    
bob.setUpPins()

# Move bob out of the way
bob.turn_left()
for i in range(4):
    bob.move()
bob.turn_left()
bob.turn_off()