auto save

snake.py

@@ -26,16 +26,16 @@ while True:
             # 接收到退出事件后退出程序
             exit()
         if event.type == locals.KEYDOWN:
-            if event.key==locals.K_RIGHT and setheading!=="left":
+            if event.key==locals.K_RIGHT and setheading!="left":
                 setheading="right"
                 snake_head=right
-            if event.key==locals.K_LEFT and setheading!=="right":
+            if event.key==locals.K_LEFT and setheading!="right":
                 setheading="left"
                 snake_head=left    
-            if event.key==locals.K_UP and setheading!=="down":
+            if event.key==locals.K_UP and setheading!="down":
                 setheading="up"
                 snake_head=up
-            if event.key==locals.K_DOWN and setheading!=="up":
+            if event.key==locals.K_DOWN and setheading!="up":
                 setheading="dowm"
                 snake_head=down 
     if setheading=="right":