Pygame gives me TypeError: add() argument after * must be a sequence, not Ball when adding Ball to sprite group

Question

最近一直在折腾pygame，决定做一个pong clone。但是，我运行遇到 ball class 的问题。

这是我的 class:

    class Ball(pygame.sprite.Sprite):
        """ This class represents the ball that bounces around. """

        # Constructor function
        def __init__(self, x, y):
            # Call the parent's constructor
            pygame.sprite.Sprite().__init__(self)

            # Set height, width
            self.image = pygame.Surface([15, 15])
            self.image.fill(white)

            # Make our top-left corner the passed-in location.
            self.rect = self.image.get_rect()
            self.rect.y = y
            self.rect.x = x

            # Set speed vector
            self.change_x = 0
            self.change_y = 0

        def goal(self):
            if self.rect.x <= SCREEN_WIDTH:
                playerscore =+ 1
                print playerscore
            elif self.rect.x >= 0:
                aiscore =+ 1
                print aiscore

        def update(self):
            """ Update the ball's position. """
            # Get the old position, in case we need to go back to it
            old_x = self.rect.x
            new_x = old_x + self.change_x
            self.rect.x = new_x

            # Did this update cause us to hit a wall?
            collide = pygame.sprite.spritecollide(self, allsprites_list, False)
            if collide:
                # Whoops, hit a wall. Go back to the old position
                self.rect.x = old_x
                self.change_x *= -1

            old_y = self.rect.y
            new_y = old_y + self.change_y
            self.rect.y = new_y

            # Did this update cause us to hit a wall?
            collide = pygame.sprite.spritecollide(self, allsprites_list, False)
            if collide:
                # Whoops, hit a wall. Go back to the old position
                self.rect.y = old_y
                self.change_y *= -1

            if self.rect.x < -20 or self.rect.x > screen_width + 20:
                self.change_x = 0
                self.change_y = 0

这会将球添加到精灵组：

    self.ball = Ball(100, 250)
    self.all_sprites_list.add(self.ball)

这是追溯：

    Traceback (most recent call last):
      File "C:/Users/Enigma/Desktop/pong.py", line 312, in <module>
        main()
      File "C:/Users/Enigma/Desktop/pong.py", line 290, in main
        game = Game()
      File "C:/Users/Enigma/Desktop/pong.py", line 218, in __init__
        self.ball = Ball(100, 250)
      File "C:/Users/Enigma/Desktop/pong.py", line 83, in __init__
        pygame.sprite.Sprite().__init__(self)
      File "C:\Python27\lib\site-packages\pygame\sprite.py", line 114, in __init__
        if groups: self.add(groups)
      File "C:\Python27\lib\site-packages\pygame\sprite.py", line 129, in add
        else: self.add(*group)
      File "C:\Python27\lib\site-packages\pygame\sprite.py", line 129, in add
        else: self.add(*group)
    TypeError: add() argument after * must be a sequence, not Ball

我已经搜索了网络和我可以在 SO 找到的所有帖子，但是 none 似乎适用于这个特定的难题。我们将不胜感激。

我是运行 python 2.7.9 Windows 7.

Answer 1

这一行：

pygame.sprite.Sprite().__init__(self)

几乎可以肯定是错误的。您想要调用 class 上的方法，而不是实例。

pygame.sprite.Sprite.__init__(self)

Pygame gives me TypeError: add() argument after * must be a sequence, not Ball when adding Ball to sprite group

Pygame gives me TypeError: add() argument after * must be a sequence, not Ball when adding Ball to sprite group

oop

pygame

sprite

python-2.7