2.10.4

# This function draws one square of the sidewalk
def draw_square():
    for i in range(4):
        forward(50)
        left(90)

# This function draw a line of squares calling the draw square
# function and then turns Tracy
def draw_sidewalk():
    pendown()
    for i in range(7):
        draw_square()
        forward(50)
    penup()
    forward(50)
    left(90)

# Sets Tracy to the starting position and then calls the sidewalk function
# 4 times for each side of the canvas.
penup()
setposition(-200,-200)
for i in range(4):
    draw_sidewalk()