6.1.6 Checkerboard

speed(0)
color_value = "red"

def draw_squarerow():
    for i in range(5):
        pendown()
        begin_fill()
        color("red")
        for i in range(4):
            forward(40)
            left(90)
        end_fill()
        penup()
        forward(40)
        pendown()
        begin_fill()
        color("black")
        for i in range(4):
            forward(40)
            left(90)
        end_fill()
        penup()
        forward(40)

def draw_squarerowalt():
    for i in range(5):
        pendown()
        begin_fill()
        color("black")
        for i in range(4):
            forward(40)
            left(90)
        end_fill()
        penup()
        forward(40)
        pendown()
        begin_fill()
        color("red")
        for i in range(4):
            forward(40)
            left(90)
        end_fill()
        penup()
        forward(40)
        
def up_one():
    left(90)
    forward(40)
    right(90)
    backward(400)
 
penup()  
setposition(-200,-200)
for i in range(5):
    draw_squarerow()
    up_one()
    draw_squarerowalt()
    up_one()
penup()
color("black")
setposition(-200,-200)