TypeError: add() argument after * must be an iterable, not Alien

在看《Python入门编程》的pygame小游戏《外星人来了》时，发现
TypeError: add() argument after * must be an iterable, not Alien
这个错误，网上找了半天没找出来，有的人说__init__拼写错了，有的说其他，但是仔细检查代码发现这个地方出错了
super().init()
错误中iterable是可迭代的意思，可迭代简单的理解就是可以用for语言进行循环遍历的

class Alien(Sprite):"""单个外星人类"""def __init__(self, ai_game):"""初始化外星人，并设置其初始位置"""# super().__init__(self)super().__init__()self.screen = ai_game.screenself.image = pygame.image.load('images/alien.bmp')self.rect = self.image.get_rect()self.rect.x = self.rect.widthself.rect.y = self.rect.heightself.x = float(self.rect.x)

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