import pygame

pygame.init()


print_message = pygame.USEREVENT + 0
pygame.time.set_timer(print_message, 3000)

displaySurface = pygame.display.set_mode((300, 300))

mySurface = pygame.Surface ((50, 50))
mySurface.fill((0,255,0))

mySurface2 = pygame.Surface((100, 50))
mySurface2.fill((0,255,0))

pos = [175, 125]

screen = pygame.display.set_mode((400, 300))
background = pygame.Surface((400,300))

while True:
        for event in pygame.event.get():
         if event.type == print_message:
            print("Hello World")
        screen.blit(background, (0, 0))
        screen.blit(mySurface, pos)
        pygame.display.update()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()