Python While循环在if语句处停止-pygame

每当我运行此代码时，它都会在

屏幕前停止。blit

同时仍在循环，反复打印

'debug3'

它甚至不知道屏幕没有定义，我的目的是让它运行

screen.blit

...
playermove = 5
walkL=pygame.image.load("files/sprites/walkL.png")
walkR=pygame.image.load("files/sprites/walkR.png")
currentSprite = walkL

#single sprite size (width, height)
h=128
w=57   
numImages = 4
    #counter
cImage=0


class Player:

    def animation(self):    
        global cImage,numImages,currentSprite,playerRect,w,h        
        if (cImage>=numImages-1):
            cImage=0
        else:
            cImage+=1
        print('debug3')

        screen.blit(currentSprite,playerRect, (cImage*w,0,w,h))

while True:
    player.animation()

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如果查看else语句，则需要缩进“print”调用以与“cImage+=1”对齐

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如果查看else语句，则需要缩进“print”调用以与“cImage+=1”对齐

----来自代码示例的片段----

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    if (cImage>=numImages-1):
        cImage=0
    else:
        cImage+=1
    print('debug3')