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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.Test Class15. Os.path.abspath ()--Get the absolute path. Example:　　在复杂的国内外环境中，东北境内政治土匪活动猖獗，到1946年冬天，已经对民主改革形成致命威胁……影片主要讲述了在城墙根下一个不起眼的街巷中，有一家“解忧理发店”，来这里理发的客人可以随意吐露心声，老板阿权都会耐心地听每一位顾客讲述他们的故事，阿权自己的内心也有一个小世界，他坚信流星雨到来的时候，所有的愿望都能实现，可是却没人相信。直到有一天他遇见了身患绝症的女孩叶蓁蓁，俩人互生情愫……他也算有自知之明，关中这么有章邯镇守着，想要顺利走出来是不可能的。