auto save

snake.py

 import pygame
+from pygame import locals
 
 # 初始化pygame，为使用pygame做准备
 pygame.init()
 
 # 创建一个窗口
-??
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+screen = pygame.display.set_mode((640,480))
+while True:
+    for event in pygame.event.get():
+        if event.type == locals.QUIT:
+            exit() 
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