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The system configuration change here refers to the change of activity life cycle caused by the switching of horizontal and vertical screens, thus causing the change of resources. In Android, system configuration changes will cause activity destruction and reconstruction, such as horizontal and vertical screen switching, but the switching time difference is too small for the user's eyes to detect. When the activity is rebuilt, just before the previous activity is destroyed, the system will call onSaveInstanceState (Bundle outState) to store various states at that time. In the new activity, Android will read the data through onRestoreInstanceState (Bundle savedInstanceState) and automatically restore to the View of the previous activity. Of course, in the activity, the developer's own code logic needs to be processed by himself.Villagers: Do you think one is from the countryside and the other is a reporter from Beijing? Can this last long?影片讲述了20世纪初上海滩十里洋场，黑帮势力的角逐纷争。纷杂乱世中，奇女子筱月桂（余男 饰）与三代上海王之间充满传奇色彩的爱恨情仇。《夜之声》：大型IT公司总裁我堀英一（藤原龙也 饰）人前风光，私下里则时长办成流浪汉减压。某晚，他救下了被坏人追逐的少女百合（饭丰万理江 饰）。百合从此暂住流浪汉家中，流浪汉介绍她到自己的公司应聘，然而少女却爱上了流浪汉。那时候他才入军，第一次上战场。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.