self.image = pygame.image.load("image/ufo2.png")
self.rect = self.image.get_rect()
self.width, self.height = bg_size[0], bg_size[1]
self.rect.left, self.rect.bottom = randint(0, self.width - self.rect.width), -100
self.speed = 5
self.active = False
self.mask = pygame.mask.from_surface(self.image)
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