save project

snake.py

 import pygame
 
+from pygame import locals
 # 初始化pygame，为使用pygame做准备
 pygame.init()
 
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 background = pygame.image.load("bg.ping")
 right = pygame.image.load("right.png")
 food = pygame.image.load("apple.png")
 
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 # 创建一个窗口
 screen = pygame.display.set_mode((660,480))
     while True: