相关疑难解决方法(0)

当我尝试存在游戏时，我似乎无法摆脱这个错误。游戏运行良好，但只有在我尝试存在游戏时才会出现错误。

import pygame
from pygame import *
import random
import time
import os
import sys
from pygame.locals import *


black = (0,0,0)
white = (255,255,255)

pygame.init()

def game():

 os.environ['SDL_VIDEO_CENTERED'] = '1'
 mouse.set_visible(False)

#screen
screen_width = 800
screen_height = 500
screen = pygame.display.set_mode([screen_width,screen_height])
#load images etc.
backdrop = pygame.image.load('bg.jpg').convert_alpha()
menu = pygame.image.load('green.jpg').convert_alpha()
ballpic = pygame.image.load('ball.gif').convert_alpha()
mouseball = pygame.image.load('mouseball.gif').convert_alpha()
display.set_caption('Twerk')
back = pygame.Surface(screen.get_size())

def text(text,x_pos,color,font2=28):
    tfont = pygame.font.Font(None, font2)

    text=tfont.render(text, True, color)
    textpos = text.get_rect(centerx=back.get_width()/2)
    textpos.top = x_pos
    screen.blit(text, textpos)

start = …