當(dāng)我調(diào)用Zombie類中的render()方法時(shí)，我想將Zombie對(duì)象的一個(gè)實(shí)例添加到ZombieList.list中。當(dāng)我嘗試這樣做時(shí)，它說list類的未解析屬性引用ZombieList。我應(yīng)該嘗試以另一種方式做到這一點(diǎn)嗎？class ZombieList:    def __init__(self):        self.list = []        for zombie in self.list:            ds.blit(zombie.image, (1000, random.randint(10, 790)))class Zombie(object):    def __init__(self):        self.attack = 3        self.speed = 5        self.health = 30        self.image = pygame.image.load("Assets/green zombie.png")        self.zombieList = []    def render(self):        ZombieList.list.append(self)