auto save

snake.py

@@ -12,6 +12,9 @@ TIME = pygame.time.Clock()
 # 背景
 background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('left.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')