I've looked through a number of code examples, but I can't determine why the window screen is not changing to blue.
import sys, pygame
pygame.init()
clock = pygame.time.Clock()
size = (1000, 440)
black = (0,0,0)
blue = (0,0,255)
white = (255,255,255)
screen = pygame.display.set_mode(size)
done = False
while not done:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
screen.fill(blue)
pygame.display.update()
I expect the screen to change colors, but it's just stay at a default grey.