Answers for "fill pygame"

.fill pygame

while running:
    event = pygame.event.poll()
    if event.type == pygame.QUIT:
        running=0
    screen.fill((0,0,255))
    pygame.display.flip()

pygame surface

# blitting a surface into another surface
screen.blit(my_image, (0, 0))
pygame.display.update()  # or pygame.display.flip()