auto save

snake.py

@@ -56,7 +56,7 @@ while True:
         y += 30
     position.append((x, y))
     if x == apple_x and y == apple_y:
-        apple_x = random.randint(0,660)
+        a = random.randint(0,660)
         apple_y = random.randint(0,480)
     position.pop(0)
     # 将背景图画上去