save project

snake.py

@@ -26,7 +26,7 @@ while True:
             # 接收到退出事件后退出程序
             exit()
         elif event.type==locals.KEYDOWN:
-            if event.key == locals.K_right:
+            if event.key == locals.K_right and setheading != "left":
                 setheading="right"
                 snake_head=right 
             if event.key == locals.K_left: