squarepattern

import turtle
size = 20                   # size of the smallest square

def draw_multicolour_square(sz):
    """Make turtle t draw a multi-colour square of sz."""
    for i in ['red','purple','hotpink','blue']:
        turtle.color(i)
        turtle.forward(sz)
        turtle.left(90)

for i in range(15):
    draw_multicolour_square(size)
    size = size + 10          # increase the size for next time
    turtle.forward(10)        # move turtle along a little
    turtle.right(18)          # and turn a little