Creation d'un fenêtre sous python

import pygame
pygame.init()
size=[400,400]
screen=pygame.display.set_mode(size)
pygame.display.set_caption("cooooool")

done=False
clock = pygame.time.Clock()

while done==False:
clock.tick(10)
for event in pygame.event.get():
if event.type ==pygame.QUIT:
done=True