sierpetsky triangle drawing using pygame and python

sierpetsky_triangle.py

import pygame, math, sys

def draw(dot1,dot2,dot3,order):
        pygame.draw.lines(screen, (255,0,0), True, [dot1,dot2,dot3], 1)
        if order>0:
            newDot1 = (int((dot1[0]+dot2[0])*0.5),int((dot1[1]+dot2[1])*0.5))
            newDot2 = (int((dot2[0]+dot3[0])*0.5),int((dot2[1]+dot3[1])*0.5))
            newDot3 = (int((dot3[0]+dot1[0])*0.5),int((dot3[1]+dot1[1])*0.5))

            pygame.draw.lines(screen, (255,0,0), True, [newDot1,newDot2,newDot3], 1)
            pygame.display.update()

            draw(dot2,newDot1,newDot2,order-1) # RECURICION
            draw(dot1,newDot1,newDot3,order-1)
            draw(dot3,newDot3,newDot2,order-1)


# SCREEEEEEEN INIT
pygame.init()
windowSize = (1000, 1000)
screen = pygame.display.set_mode(windowSize)

# FONT
# pygame.font.init()
# myfont = pygame.font.SysFont("Comic Sans MS", 30)
# label = myfont.render("PRESS SPACE!!", 1, (255,0,0))
# textSize = pygame.font.Font.size(label)

squareRoot3 = math.sqrt(3)
order=0

# MAIN LOOP
while 1:

    # screen.blit(label, (0,windowSize[1]-textSize[1] ))
    x = windowSize[0]
    y = windowSize[1]
    # dx = y*squareRoot3

    # FIRST TRIANGLE
    order+=1
    draw((0,0),(x,0),(x/2,y),order)
    go=1
    while go:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:
                    go=0
    pygame.display.update()

input()