我在使用Python的类继承问题时遇到问题

Question

我正在创建一个游戏，您在屏幕的底部有一艘船，并且您正在从屏幕顶部的点落下的岩石上进行拍摄。有两种类型的岩石从天而降，大小不一。我决定将1个课程用作Rock，并将两个def标记为smallRock和bigRock。我认为我在主程序中的代码正确，但我不断收到错误。 这里是我用于岩石类的代码：

class Rock(pygame.sprite.Sprite): 
    def __init__(self,bigRock,smallRock): 
     pygame.sprite.Sprite.__init__(self) 
     self.width = 20 
     self.height = 20 
     self.x_change = 0 
     self.y_change = yChange 
     self.image.set_colorkey([255,255,255]) 
     self.rect = self.image.get_rect() 
     self.rect.left = x 
     self.rect.top = y 

    def bigRock(self): 
     self.image = pygame.image.load('rockLarge.png').convert() 

    def smallRock(self): 
     self.image = pygame.image.load('rockSmall.png').convert() 

下面是代码从主程序块：

# How many big rocks falling------------------ 

    Rock = pygame.sprite.RenderPlain() 
    bigRockRandomizer = rockRandomizer 
    bigRockQuantity = 0 
    while bigRockQuantity < bigRockRandomizer: 
     bigRockXLocation = xLocation 
     brock = Rock.bigRock(black,bigRockXLocation) 
     Rock.bigRock.add(brock) 
     bigRockQuantity = bigRockQuantity + 1 

# How many small rocks falling----------------- 

    Rock = pygame.sprite.RenderPlain() 
    smallRockRandomizer = rockRandomizer 
    smallRockQuantity = 0 
    while smallRockQuantity < smallRockRandomizer: 
     smallRockXLocation = xLocation 
     srock = smallRock(black,smallRockXLocation) 
     smallRock.add(srock) 
     smallRockQuantity = smallRockQuantity + 1 

这里是当前错误码我得到：

Traceback (most recent call last): 
    File "C:\Users\Steve\Desktop\Project April\Alien Metor Storm v1_5\main.py", line 561, in <module> 
    main() 
    File "C:\Users\Steve\Desktop\Project April\Alien Metor Storm v1_5\main.py", line 58, in main 
    brock = Rock.bigRock(black,bigRockXLocation) 
AttributeError: 'Group' object has no attribute 'bigRock' 

有人能告诉我我做错了什么，并指出我回到正确的轨道？

Answer 1

Rock = pygame.sprite.RenderPlain() # OOPS: Overwrote class name Rock 

    brock = Rock.bigRock(black,bigRockXLocation) ## OOPS: Even if Rock was still the class, this call is invalid because bigRock is an instance method. 

我建议你试试子类，而不是在Rock制作方法。像

class Rock: 
    def __init__(self, imagefn): 
     self.image = pygame.image.load(imagefn).convert() 
     ... 

class BigRock(Rock): 
    def __init__(self): 
     Rock.__init__(self, 'rockLarge.png') 

class SmallRock(Rock): 
    def __init__(self): 
     Rock.__init__(self, 'rockSmall.png') 

东西接下来，只要BigRock或SmallRock情况下，您认为合适的。