# t_Sierpinski_Triangle.py

# t_Sierpinski_Triangle.py

import turtle
Window = turtle.Screen()

Window.bgcolor('white')
turtle.color('white')

def serp_tri(side):
    turtle.goto(-side/2, -side/2.3)
    side = side*1.0
    def triangle(side):
        if side > 3:
            for i in range(3):
                turtle.color('black')
                turtle.ht()
                turtle.fd(side)
                turtle.left(120)
            turtle.pu()
            if int(side) < 10:
                turtle.pd()
            turtle.ht()
            triangle(side/2)
            turtle.fd(side/2)
            triangle(side/2)
            turtle.bk(side/2)
            turtle.left(60)
            turtle.fd(side/2)
            turtle.right(60)
            triangle(side/2)
            turtle.left(60)
            turtle.bk(side/2)
            turtle.right(60)
    turtle.speed(0)
    triangle(side)

serp_tri(600)