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18. Os.path.dirname (path)--return file path各项安排都妥了，这日晚间，板栗便对爹娘道，明儿他要去云天寺进香，问郑氏去不去，还说奶奶和红椒她们都要去。User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation:许久之后，周芷若说道：无忌哥哥，我有一句话要问你，这世上曾有四个女子真心爱你。The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.3. After the installation is completed, right-click "This Computer" on the desktop, left-click "Properties", find "Advanced System Settings" on the left side of the pop-up window and click.咦，青青青木也发了一个长贴。