列表索引超出 pygame 中的项目符号范围

Question

所以我是 pygame 的新手，我一直在做的项目是制作旧的外星人入侵街机游戏。我知道我需要清理我的图片和显示以及尺寸和其他东西所以不用担心，但我现在正在努力解决的问题是发射我的子弹，我将它们存储在一个列表中然后删除它们。但我想出了错误 "list index out of range"。此错误显示在此代码的第 50 行。哦，这个错误只会在我同时激活 2 颗子弹时出现。例如，我可以每秒或每两秒射击 1 次，但如果我快速射击一点，并且有两个同时在屏幕上移动，那么我会得到错误，真正要看的东西在第 42-52、88-90 行，以及最后 3. 非常感谢任何关于提高我的代码效率的建议

import pygame
pygame.init()
#keystate variables
keystate={'left':False,'right':False,'up':False,'down':False}

red=(255,0,0)
black=(0,0,0)
green=(0,255,0)
shipX=0
shipY=445
bulletsX=[]
bulletsY=[]
ship=pygame.image.load("ship.png")
ship=pygame.transform.scale(ship,(35,35))
bullet_pic=pygame.image.load("bullet.png")
bullet_pic=pygame.transform.scale(bullet_pic,(25,25))
backdrop=pygame.image.load("backdrop.png")
backdrop=pygame.transform.scale(backdrop,(640,400))

clock=pygame.time.Clock()
screen=pygame.display.set_mode((640,480))
screen.blit(backdrop,(0,0))

# ship movement functions
def moveship_Xneg():
    global shipX
    if shipX>0:
        shipX-=1
def moveship_Xpos():
    global shipX
    if shipX<605:
        shipX+=1
def moveship_Yneg():
    global shipY
    if shipY<445:
        shipY+=1
def moveship_Ypos():
    global shipY
    if shipY>400:
        shipY-=1

#gunfire definitions
def move_bullet():
    for bullet in range(len(bulletsX)):
        bulletsY[bullet]-=2
        screen.blit(bullet_pic,(bulletsX[bullet],bulletsY[bullet]))
        pygame.display.update()
def del_bullet():
    for bullet in range(len(bulletsX)):
#below this is line 50, realized it didn't show numbers, my bad
        if bulletsY[bullet]<=-10:
            bulletsY.remove(bulletsY[bullet])
            bulletsX.remove(bulletsX[bullet])

# ship movement changes
def start_ship(): #draws the starting position of the ship
    screen.blit(ship,(0,445))
    pygame.display.update()
def draw_newship(): #draws the new ship and updates the screen
    screen.blit(ship,(shipX,shipY))
    #screen.blit(backdrop,(shipX
    #print(shipX,shipY)
    pygame.display.update()
#def del_oldship(): #deletes the old ship

start_ship()
#Main Loop
running=True
while running:
    clock.tick(350)
    #checks keystroke events
    for event in pygame.event.get():
        #quits the program
        if event.type==pygame.QUIT:
            running=False
            pygame.quit()
        #KEYDOWN CHECKS
        if event.type==pygame.KEYDOWN:
            #Movement variable changes
            if event.key==pygame.K_LEFT:
                keystate['left']=True
            if event.key==pygame.K_RIGHT:
                keystate['right']=True
            if event.key==pygame.K_DOWN:
                keystate['down']=True
            if event.key==pygame.K_UP:
                keystate['up']=True
            #Action per event
            if event.key==pygame.K_SPACE:
                bulletsX.append(shipX+17.5)
                bulletsY.append(shipY)
        #KEYUP CHECKS
        if event.type==pygame.KEYUP:
            #movement variable changes
            if event.key==pygame.K_LEFT:
                keystate['left']=False
            if event.key==pygame.K_RIGHT:
                keystate['right']=False
            if event.key==pygame.K_DOWN:
                keystate['down']=False
            if event.key==pygame.K_UP:
                keystate['up']=False
    # pygame event processing ends

    if running==True:

        #performs an action per each loop dependant on keystate variables
        if keystate['left']==True:
            #del_oldship()
            moveship_Xneg()
            draw_newship()
        if keystate['right']==True:
            #del_oldship()
            moveship_Xpos()
            draw_newship()
        if keystate['down']==True:
            #del_oldship()
            moveship_Yneg()
            draw_newship()
        if keystate['up']==True:
            #del_oldship()
            moveship_Ypos()
            draw_newship()
        if bulletsX!=[]:
            del_bullet()
            move_bullet()
        #for coord in range(len(bulletsX)):
            #print(bulletsX[coord],bulletsY[coord])

Answer 1

实际上您可以在错误消息中找到错误。 List index out of range

例如

a = [1]
a.remove(1)
>>>a[0]
`IndexError: list index out of range`

在您的代码中，

if bulletsY[bullet] <= -10

这次可能是bulletsY中没有元素在bullet位置或者列表bulletsY可能是空的

所以你可以这样试试

if bulletsY and bulletsY[bullet] <= -10

希望对您有所帮助

已更新

试试这个

def del_bullet():

    for bullet in range(len(bulletsX)):
#below this is line 50, realized it didn't show numbers, my bad
        try:
            if bulletsY[bullet]<=-10:
                bulletsY.remove(bulletsY[bullet])
                bulletsX.remove(bulletsX[bullet])
        except:pass

列表索引超出 pygame 中的项目符号范围

list index is out of range for bullets in pygame

python

pygame

list