IndexError：从pygame中的空列表中弹出

Question

嗨，伙计，我的游戏有问题，当你运行它时我收到这个错误，“第 283 行，在 bullets.pop(0)”，“IndexError：从空列表中弹出”，我认为这是因为项目符号列表是空的，它不能弹出它们，但我不知道如何修复它。如果你能帮助我，我将不胜感激。这是代码，谢谢。import pygameimport mathimport randompygame.init()win = pygame.display.set_mode((800, 400))pygame.display.set_caption("Pandemic")clock = pygame.time.Clock()score = 0walkup = [pygame.image.load("Soldier-1up.png"), pygame.image.load("Soldier-2up.png"), pygame.image.load("Soldier-3up.png")]walkdown = [pygame.image.load("Soldier-1down.png"), pygame.image.load("Soldier-2down.png"), pygame.image.load("Soldier-3down.png")]walkright = [pygame.image.load("Soldier-1right.png"), pygame.image.load("Soldier-2right.png"), pygame.image.load("Soldier-3right.png")]walkleft = [pygame.image.load("Soldier-1left.png"), pygame.image.load("Soldier-2left.png"), pygame.image.load("Soldier-3left.png")]bg = pygame.image.load("map.png")ch = pygame.image.load("Soldier-1up.png")bulletimg = pygame.image.load("bullet.png")walkvirus1 = [pygame.image.load("virus1.png"), pygame.image.load("virus2.png"), pygame.image.load("virus3.png")]walkvirus2 = [pygame.image.load("1virus1.png"), pygame.image.load("1virus2.png"), pygame.image.load("1virus3.png")]background1 = pygame.image.load("menu.png")class player(object):    def __init__(self, x, y, width, height):        self.x = x        self.y = y        self.width = width        self.height = height        self.vel = 5        self.walkcount = 0        self.right = False        self.left = False        self.up = False        self.down = False        self.standing = True        self.hitbox = (self.x, self.y, self.width, self.height)        self.life = 3

Answer 1

添加一条if语句，使程序仅在列表中有项目符号时才for执行循环：

if bullets:

    for bullet in bullets:

        if virus1.visible == True:

            if bullet.y - bullet.radius < virus1.hitbox[1] + virus1.hitbox[3] and virus1.y + bullet.radius > virus1.hitbox[1]:

                if bullet.x + bullet.radius > virus1.hitbox[0] and bullet.x - bullet.radius < virus1.hitbox[0] + \

                        virus1.hitbox[2]:

                    virus1.hit()

                    score += 1

                    bullets.pop(0)