我是python和pygame的初学者，我正在尝试使用类生成一些对象，并对其进行筛选。但我不知道如何消除错误“typeerror:参数1必须是pygame.surface，而不是class”。。代码如下：

ddong(pygame.Rect) :
 def __init__(self):
     self.ddong = pygame.image.load('C:/Users/user/Desktop/게임 프 
 트/pygame_basic_.py/enemy.png')
     self.ddong_size = self.ddong.get_rect().size
     self.ddong_width = self.ddong_size[0]
     self.ddong_hight = self.ddong_size[1]
     self.x_pos = randint(1, screen_width - self.ddong_width)
     self.y_pos = 0
     self.rect = self.ddong.get_rect()
     self.rect.left = self.x_pos
     self.rect.top = self.y_pos```

and if I make object through this class and `blit` it like this:

 screen.blit(enemy1, (enemy1.x_pos, enemy1.y_pos))

There comes the error message. I can't find what is wrong..

I'm having a hard time trying to figure this out. plz help