save project

snake.py

@@ -45,6 +45,8 @@ while True:
             if event.key == locals.K_DOWN and setheading != "up":
                 setheading = 'down'
                 snake_head = down
+    if x>660 or x<0 or y>480 or y<0:
+            exit()
 
     # 设置贪吃蛇的头部坐标
     if setheading == "right":