嗨，伙計，我的游戲有問題，當你運行它時我收到這個錯誤，“第 283 行，在 bullets.pop(0)”，“IndexError：從空列表中彈出”，我認為這是因為項目符號列表是空的，它不能彈出它們，但我不知道如何修復它。如果你能幫助我，我將不勝感激。這是代碼，謝謝。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