Mandala Triângulo em Python

from turtle import *

import time

setup(900, 900)

bgcolor("black")

speed(0)

hideturtle()

pensize(2)

color("yellow")

tracer(0,0)

for i in range(100):

    forward(400)

    left(120)

    forward(400)

    left(120)

    forward(400)

    left(120)

    left(4)

    update()

    time.sleep(0.03)

done()