save project

snake.py

@@ -71,6 +71,8 @@ while True:
     screen.blit(text,(540,10))
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
+    if x<0 or x>630 or y<0 or y>450:
+        exit()
     # 刷新画面
     pygame.display.update()
     Fpsclock.tick(3)
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