<s>[INST] import pygame
from pygame.locals import *
from sys import exit

pygame.init()

screen = pygame.display.set_mode((800, 600))

pygame.display.set_caption("Pygame Window")

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            exit()

    pygame.draw.rect(screen, (255, 255, 255), (10, 10, 50, 50))

    pygame.display.update()

This code creates a white square in the top left of a window. The problem with this code is that it continuously updates and draws the white square. This is inefficient and can lead to a lot of wasted CPU time. A better approach is to only redraw the screen when something has changed. We can use events to make this more efficient. However, in this simple example there are no events that can trigger a redraw. How do we handle this?[/INST]