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Four: Understanding the Agency Model女主一上场就是那种强势的把男人都当成工具，不喜欢家长里短，用积极享受生活的女人，她估计是离婚女人，带着两个正处在青春期的孩子，但是，她可能怎么都想不到，自己昨天的一夜情对象（甚至一夜情都不算）竟然是自己今天要调查的案子的受害者亲属，这大约就是她恶运的开始，尤其是她又删除了有自己和一夜情对象影象的CCTV时，估计她已经很难挽回了。正在她焦头烂额之际，上级还偏偏让她带上一个实习生，这个实习生虽然帅气，但是已婚了，并且还刚生了一个女孩，目前正沉浸在初有父亲的喜悦当中，他可能不知道，这个女孩到青春期后会有多么难搞。大女主立下规矩：尽量少说话，不谈家事，嗯，就喜欢这种干脆不刮躁的女生。祝英台女扮男装去书院求学，遇梁山伯，一见如故。同窗三年，山伯不知英台女儿身。后英台因家信促其速归，留定情信物于山伯。山伯方知英台是女郎 ，两人情定三生拜高堂。无奈英台已被父母许配给马文才。多情自古多离伤 ，父母之命打鸳鸯 ，楼台相会绝情殇，化为蝴蝶飞成双……他知道李天宠是我舅舅？？何永强瞪着眼道。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.8. Os.path.isdir ()--Determines whether the specified object is a directory. True or False. Example:? ? ?