auto save

snake.py

@@ -12,7 +12,7 @@ background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
-
+time = pygame.time.clock()
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
@@ -29,4 +29,5 @@ while True:
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面
-    pygame.display.update()
\ No newline at end of file
+    pygame.display.update()
+    time.tick(3)
\ No newline at end of file