有人可以帮我找到我的 python 程序中的错误吗？

Question

嗨，这是我的错误和我的 python 程序我已经坚持了一周，迫切需要一些帮助如果有人知道错误是什么以及如何解决它，请在下面评论！ 我将不胜感激任何帮助！ 这是从 python 教程复制的，它不起作用

import pygame
import sys
import math
pygame.init()


def cropSurface(newWidth,newHeight,cropWidth,cropHeight,
                image):
    newSurf=pygame.Surface((newWidth,newHeight),
                          pygame.SRCALPHA,32)
    newSurf.blit(image,(0,0),(cropWidth,cropHeight,
                              newWidth,newHeight))
    return newSurf

def movePlayer(direction,radius,absRot):
    yChange=5
    deltaTheta=int(90/(radius/yChange))
    if direction=="Left":
        deltaTheta*=-1

    finalRot=(absRot+deltaTheta)*math.pi/180

    Hypotenuse=(radius*math.sin(finalRot)/
                (math.sin((math.pi-finalRot)/2)))

    newX=Hypotenuse*math.cos(math.pi/2-(math.pi-finalRot)/2)
    newY=Hypotenuse*math.sin(math.pi/2-(math.pi-finalRot)/2)

    return newX,newY,absRot+deltaTheta
def updateFrameImages(showFoot=False):
    global screen,grassImage,goalLeft,goalMiddle,goalRight
    global ball,player,goalStart,ballX,ballY
    global playerX,playerY
    screen.blit(grassImage,(0,0))
    screen.blit(goalLeft,(goalStart,0))
    screen.blit(goalMiddle,(goalStart+
                        goalLeft.get_rect().width,
                        0))
    screen.blit(goalRight,(goalStart+
                       goalLeft.get_rect().width+
                       goalMiddle.get_rect().width,
                       0))
    if showFoot:
        global foot,footX,footY
        screen.blit(foot,(footX-foot.get_rect().width/2,
                          footY-foot.get_rect().height/2))
        
        screen.blit(ball,(ballX-ball.get_rect().width/2,
                      ballY-ball.get_rect().height/2))
            
        screen.blit(player,(playerX-player.get_rect().width/2,
                        playerY-player.get_rect().height/2))
width=900
height=700
screenDim=(width,height)

screen=pygame.display.set_mode(screenDim)

pygame.display.set_caption("my second game")

grassImage=pygame.image.load("23.2_-_grass.png").convert()
grassImage=pygame.transform.scale(grassImage,(width,height))
screen.blit(grassImage,(0,0))


rescale=3
player=pygame.image.load("24.4_-_characterBody.png").convert_alpha()
playerWidth=player.get_rect().width
playerHeight=player.get_rect().height
player=pygame.transform.scale(player,(playerWidth*rescale,playerHeight*rescale))
player=pygame.transform.rotate(player,90)
playerStart=player
currentRotation=0
playerStart=player
currentRotation=0
foot=pygame.image.load("24.3_-_characterFoot.png").convert_alpha()
footWidth=foot.get_rect().width
footHeight=foot.get_rect().height
foot=pygame.transform.scale(foot,(footWidth*rescale,footHeight*rescale))
foot=pygame.transform.rotate(foot,90)
footStart=foot

rescaleBall=2
ball=pygame.image.load("24.2_-_ball.png").convert_alpha()
ballWidth=ball.get_rect().width
ballHeight=ball.get_rect().height
ball=pygame.transform.scale(ball,(ballWidth*rescaleBall,ballHeight*rescaleBall))



goalLeft=pygame.image.load("25.2_-_goalLeft.png").convert_alpha()
goalLeft=pygame.transform.scale(goalLeft,(250,270))
goalLeftWidth=goalLeft.get_rect().width
goalLeftHeight=goalLeft.get_rect().height
adjust=12
goalLeft=cropSurface(goalLeftWidth/2+adjust,
                     goalLeftHeight/2+adjust,
                     goalLeftWidth/2-adjust,
                     goalLeftHeight/2-adjust,
                goalLeft)


goalMiddle=pygame.image.load("26.2_-_goalMiddle.png").convert()
goalMiddle=pygame.transform.scale(goalMiddle,(250,270))
goalMiddleWidth=goalMiddle.get_rect().width
goalMiddleHeight=goalMiddle.get_rect().height
goalMiddle=cropSurface(goalMiddleWidth,
                       goalMiddleHeight/2+adjust,
                       0,
                       goalMiddleHeight/2-adjust,
                       goalMiddle)


goalRight=pygame.image.load("26.3_-_goalRight.png").convert_alpha()
goalRight=pygame.transform.scale(goalRight,(250,270))
goalRightWidth=goalRight.get_rect().width
goalRightHeight=goalRight.get_rect().height

goalRight=cropSurface(goalRightWidth/2+adjust,goalRightHeight/2+adjust,0,goalRightHeight/2-adjust,goalRight)


goalStart=(width-goalLeft.get_rect().width-
           goalMiddle.get_rect().width-
           goalRight.get_rect().width)/2

screen.blit(goalLeft,(goalStart,0))
screen.blit(goalMiddle,(goalStart+goalLeft.get_rect().width,0))
screen.blit(goalRight,(goalStart+goalLeft.get_rect().width+goalMiddle.get_rect().width,0))


playerX=width/2
playerY=530

playerXOriginal=playerX
playerYOriginal=playerY
#screen.blit(foot,(0,0))
screen.blit(player,(playerX-player.get_rect().width/2,
                    playerY-player.get_rect().height/2))
ballX=width/2
ballY=450

radius=playerY-ballY
screen.blit(ball,(ballX-ball.get_rect().width/2,
                  ballY-ball.get_rect().height/2))

frame=pygame.time.Clock()
finished = False
while finished ==False:
    #a;slkdjf;alskdjf;aslkdjf;a;dlkfj
    for event in pygame.event.get():
        #a;fjallkdjfaa;lakjdf;ala;sdkfja;
        if event.type==pygame.QUIT:
            finished=True
            pygame.quit()
            sys.exit()

    pressedKeys=pygame.key.get_pressed()
    print(pygame.K_LEFT)
    
    if pressedKeys[pygame.K_LEFT]==1:
        if currentRotation>-90:
            changeX,changeY,currentRotation=movePlayer("Left",radius,currentRotation)
            player=pygame.transform.rotate(playerStart,currentRotation)
            playerX=playerXOriginal+changeX
            playerY=playerYOriginal-changeY
        
    elif pressedKeys[pygame.K_RIGHT]==1:
        if currentRotation<90:
            changeX,changeY,currentRotation=movePlayer("Right",radius,currentRotation)
            player=pygame.transform.rotate(playerStart,currentRotation)
            playerX=playerXOriginal+changeX
            playerY=playerYOriginal-changeY
        
    elif pressedKeys[pygame.K_SPACE]==1:
        xMove=(playerX-ballX)/10
        yMove=(playerY-ballY)/10
        normMove=1/math.sqrt(xMove**2+yMove**2)
        distanceToShoulder=20
        shoulderAngle=currentRotation*math.pi/180
        for i in range(3):
            playerX-=xMove
            playerY-=yMove
            updateFrameImages()
            pygame.display.flip()
            frame.tick(30)
        footX=(playerX+distanceToShoulder*math.cos(shoulderAngle)-25*xMove*normMove)
        footY=(playerY-distanceToShoulder*math.sin(shoulderAngle)-25*yMove*normMove)
        foot=pygame.transform.rotate(footStart,currentrotation)
        updateFrameImages()
    #wwwwwwwwww
    updateFrameImages(True)
    pygame.display.flip()
            
    screen.blit(player,(playerX-player.get_rect().width/2,
                        playerY-player.get_rect().height/2))
    pygame.display.flip()
    frame.tick(30)

这是我的错误

Traceback (most recent call last):
  File "C:\Users\Divija\Downloads\Udemy Master Python Interactively With PyGame Ultimate Bootcamp_git.ir\5_-_Files_And_Images\py.py", line 191, in <module>
    updateFrameImages(True)
  File "C:\Users\Divija\Downloads\Udemy Master Python Interactively With PyGame Ultimate Bootcamp_git.ir\5_-_Files_And_Images\py.py", line 45, in updateFrameImages
    screen.blit(foot,(footX-foot.get_rect().width/2,
NameError: name 'footX' is not defined

        

        

Answer 1

根据给定的代码和错误消息，变量“footX”已被称为全局变量，但尚未在您的代码中全局定义。

这段代码可能会清楚您收到此错误的原因

footX = "some value" # you get error if this line is commented out


def my_func():
    global footX
    print("here footX is accessed as a global variable with value {}".format(footX))


my_func()

此外，我注意到代码中的footX变量在 if else 块中声明，并且稍后调用使用此变量的 function。

因此，可能是特定的elif块（创建footX变量）未执行，这会在UpdateFrameImages中产生错误。

可能的解决方案：

UpdateFrameImages仅在showFoot=True时使用 footX。 因此，最初，当footX时，可以将showFoot参数设置为 False。

如果在 elif 块中定义了 footX，则在调用UpdateFrameImages时设置showFoot = True 。

注意：我也将currentrotation更改为currentRotation ，因为currentrotation没有在任何地方定义。

我在 while 循环中进行了如下更改，只需将其替换为您的 while 循环：

while finished ==False:
    #a;slkdjf;alskdjf;aslkdjf;a;dlkfj
    for event in pygame.event.get():
        #a;fjallkdjfaa;lakjdf;ala;sdkfja;
        if event.type==pygame.QUIT:
            finished=True
            pygame.quit()
            sys.exit()

    pressedKeys=pygame.key.get_pressed()
    print(pygame.K_LEFT)
    
    if pressedKeys[pygame.K_LEFT]==1:
        if currentRotation>-90:
            changeX,changeY,currentRotation=movePlayer("Left",radius,currentRotation)
            player=pygame.transform.rotate(playerStart,currentRotation)
            playerX=playerXOriginal+changeX
            playerY=playerYOriginal-changeY
        
    elif pressedKeys[pygame.K_RIGHT]==1:
        if currentRotation<90:
            changeX,changeY,currentRotation=movePlayer("Right",radius,currentRotation)
            player=pygame.transform.rotate(playerStart,currentRotation)
            playerX=playerXOriginal+changeX
            playerY=playerYOriginal-changeY
        
    elif pressedKeys[pygame.K_SPACE]==1:
        xMove=(playerX-ballX)/10
        yMove=(playerY-ballY)/10
        normMove=1/math.sqrt(xMove**2+yMove**2)
        distanceToShoulder=20
        shoulderAngle=currentRotation*math.pi/180
        for i in range(3):
            playerX-=xMove
            playerY-=yMove
            updateFrameImages()
            pygame.display.flip()
            frame.tick(30)
        footX=(playerX+distanceToShoulder*math.cos(shoulderAngle)-25*xMove*normMove)
        footY=(playerY-distanceToShoulder*math.sin(shoulderAngle)-25*yMove*normMove)
        foot=pygame.transform.rotate(footStart,currentRotation) #changed 'currentotation' to 'currentRotation'
        updateFrameImages(True) # true beacuse now footX is defined
    #wwwwwwwwww
    updateFrameImages(False) #false since footX not defined initially
    pygame.display.flip()
            
    screen.blit(player,(playerX-player.get_rect().width/2,
                        playerY-player.get_rect().height/2))
    pygame.display.flip()
    frame.tick(30)