check_events（）missing 1 required positional arguments ：'bullets'

Question

bullets=Group()

游戏主循环

while True:

    gf.check_events(ai_setting,screen,ship,bullets)
    

def check_events(event,ai_setting,screen,ship,bullets):
#监视键盘与鼠标事件
for event in pygame.event.get():

 if event.type==pygame.QUIT :
        sys.exit()
#相应键盘与鼠标事件
 elif   event.type==pygame.KEYDOWN:
        check_keydown_events(event,ai_setting,screen,ship,bullets)