### Lesson 18: Turtle in a box

posted May 3, 2019, 8:45 AM by Attila Lengyel   [ updated May 10, 2019, 7:28 AM ]
 import turtle as tplayer1 = t.Turtle()player1.shape("turtle")player1.pencolor("white")speed = 10angle = 10screen = t.Screen()def draw_rectangle(player, x, y, width, height, color): startpos = player.pos() startcolor = player.pencolor() player.pencolor(color) player.up() player.goto(x, y) player.down() player.forward(width) player.left(90) player.forward(height) player.left(90) player.forward(width) player.left(90) player.forward(height) player.left(90) player.up() player.goto(startpos) player.down() player.pencolor(startcolor)draw_rectangle(player1, -210, -210, 420, 420, "red")def position(player): if player.xcor() >= 200 : player.up() player.goto(199, player.ycor()) player.down()    return False if player.xcor() <= -200: player.up() player.goto(-199, player.ycor()) player.down()    return False if player.ycor() >= 200: player.up() player.goto(player.xcor(), 199) player.down()    return False if player.ycor() <= -200: player.up() player.goto(player.xcor(), -199) player.down()    return False return Truedef f(): if position(player1): player1.forward(speed)def b(): if position(player1): player1.backward(speed)def r(): player1.right(angle)def l(): player1.left(angle)screen.onkey(f, "Up")screen.onkey(b, "Down")screen.onkey(r, "Right")screen.onkey(l, "Left")screen.listen()