sierpinski carpet python turtle
#!/usr/bin/env python3
import turtle
# --- functions ---
def s(n, l):
if n == 0: # stop conditions
# draw filled rectangle
turtle.color('black')
turtle.begin_fill()
for _ in range (4):
turtle.forward(l)
turtle.left(90)
turtle.end_fill()
else: # recursion
# around center point create 8 smalles rectangles.
# create two rectangles on every side
# so you have to repeat it four times
for _ in range(4):
# first rectangle
s(n-1, l/3)
turtle.forward(l/3)
# second rectangle
s(n-1, l/3)
turtle.forward(l/3)
# go to next corner
turtle.forward(l/3)
turtle.left(90)
# update screen
turtle.update()
# --- main ---
# stop updating screen (to make it faster)
turtle.tracer(0)
# start
s(4, 400)
# event loop
turtle.done()