import turtle

def draw_multicolor_square(t, sz):

"""Make turtle t draw a multi-color square of sz."""

for i in ["red", "purple", "hotpink", "blue"]:

t.color(i)

t.forward(sz)

t.left(90)

wn = turtle.Screen() # Set up the window and its attributes

wn.bgcolor("lightgreen")

tess = turtle.Turtle() # Create tess and set some attributes

tess.pensize(3)

size = 15 # Size of the smallest square

for i in range(20):

draw_multicolor_square(tess, size)

size += 8 # Increase the size for next time

tess.forward(20) # Move tess along a little

tess.right(36) # and give her some extra turn

wn.mainloop()