import pygameimport random# defaultWIDTH=1280HEIGHT=1060FPS=60sum=0# set colorWHITE=(255,255,255)BLACK=(0,0,0)RED=(255,0,0)GREEN=(0,255,0)BLUE=(0,0,255)color=[WHITE,RED,GREEN,BLUE]# set Block classclass Block(pygame.sprite.Sprite):    def __init__(self):        pygame.sprite.Sprite.__init__(self)        self.image=pygame.Surface((50,50))        self.image.fill(random.choice(color))        self.rect = self.image.get_rect()        self.rect.center=(random.randint(1,WIDTH),random.randint(1,HEIGHT))        self.ce=random.randint(1,2)        self.speed=random.choice([i for i in range(-20,20) if not i in range(-5,5)])    def update(self):        if self.ce==1:            self.rect.x+=self.speed        else:            self.rect.y+=self.speed# pygame initpygame.init()screen=pygame.display.set_mode((WIDTH,HEIGHT))pygame.display.set_caption('lowb cartoon')clock = pygame.time.Clock()#set groupall_sprites = pygame.sprite.Group()block1=[Block() for i in range(random.randrange(20,40))]block2=[Block() for i in range(random.randrange(20,40))]#block=Block()#print(block.ce,block.speed)all_sprites.add(block1)all_sprites.add(block2)# main looprunning=Truewhile running:    sum+=1    if sum%100==0:        block1=[Block() for i in range(random.randrange(20,40))]        all_sprites.add(block1)    if sum%150==0:        block2=[Block() for i in range(random.randrange(20,40))]        all_sprites.add(block2)    #set FPS    clock.tick(FPS)    #set event    for event in pygame.event.get():        if event.type == pygame.QUIT:            running=False    #set update    all_sprites.update()    #set draw/render    screen.fill(BLACK)    all_sprites.draw(screen)    #flip time    pygame.display.flip()pygame.quit()