auto save

snake.py

@@ -53,6 +53,9 @@ while True:
         y += 30
     position.append((x, y))
     position.pop(0)
+    if x==apple_x and y==apple_y:
+        apple_x=random(0,660)
+        apple_y=random(0,480)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去