create a function to store the mouse clicks and redraw from the mouse clicks in turtle.

def drawSquare(t, sz):
    """Make turtle t draw a square of with side sz."""
    for i in range(4):
        t.forward(sz)
        t.left(90)
        
wn = turtle.Screen()       # Set up the window and its attributes
wn.bgcolor("lightgreen")
wn.title("Alex meets a function")


tess = turtle.Turtle()     # create tess and set some attributes
tess.pensize(3)

size = 20                   # size of the smallest square
for i in range(5):
    drawSquare(tess, size)
    size = size + 20        # increase the size for next time
    tess.forward(10)        # move tess along a little
    tess.right(18)          # and give her some extra turn

wn.mainloop()