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你们说这样的人该不该杀？短暂的寂静之后，三军将士齐声呐喊：该杀。Allows an object to change its behavior when its internal state changes. Object appears to have modified its class.Use Python for data analysis: This book is a detailed version of Python's pandas package. Learn this to master some basic pandas commands. However, this is not the point, because pandas is too slow to produce a large amount of data and may collapse (I don't know if there is any improvement now-!) The point is, through studying this book, I feel a little about the data operation and am familiar with the basic data operation process. All the operations in this book can be replaced by native Python, and Pandas package is not needed. Finding feelings is very important.//Triggers a delegate via its static method, Invoke又扯了些闲话，泥鳅姑姑受不住了，对郑氏道：我想去后边瞧瞧小葱。We know that for the above code, Xiao Hong subscribes to shoeObj, an object that buys shoes, but if we need to subscribe to buying houses or other objects in the future, we need to copy the above code and change the object code inside again. For this reason, we need to encapsulate the code.韩信轻轻摇头道：本帅也是在做赌注啊，幸运的是似乎赌赢了。