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When Python is programmed, it often deals with files and directories, which cannot be separated from OS modules. The OS module contains common operating system functions, independent of the specific platform. The following is a list of commonly used commands1. The most common method is to determine whether the savedInstanceState is empty or not in onCreate (Bundle savedInstanceState) and restore the data body in Activity;(2) SKMlist, a material generation tool, is used as follows: 1) Drag jpg or bmp files to the top path input box, and the software will automatically add all jpg and bmp files under the same directory to the list; Or click the path button to specify the directory. 2) Click save, select the path, and name the skm file to confirm, that is, generate the material library file. 3) The skm file can be used normally by copying it to the Library file under the SkechUp installation directory. 4) The size of the map is set according to the way of pix × pix. Therefore, if your scene unit is mm, then a 20 × 20 map will be tiled according to the size of 20 mm × 20 mm. If it is not suitable for the scene, please adjust it after assigning materials. Because the size of the map cannot be unified, this is the best way to keep the original scale of the picture.Let's take a look at tobacco shreds. When we open them, we will find that this is not actually made of traditional tobacco leaves. It is really fragrant and soft and feels humid. It should be made of some special material after soaking.杰克·斯伯洛是活跃在加勒比海上的海盗，拥有属于自己的“黑珍珠”号海盗船。巴伯萨是无恶不作的坏蛋，他抢了杰克的“黑珍珠”在加勒比海横行霸道。巴伯萨一伙袭击了罗亚尔港小镇，绑架了总督的女儿伊莉莎白·斯万和铁匠学徒威尔·特纳，杰克偷来英国皇家舰队最快的“拦截号”军舰迅速追去。在打斗中，威尔和杰克发现，巴伯萨和他的海盗们身背咒语，在每一个月光之夜，他们就变成不死骷髅，而伊莉莎白正是解开咒语的关键。该剧是《青丘狐传说》的续集，讲述了黄轻凤和胡飞鸾被骊山众狐选作代表，进宫执行任务以阻止皇室对骊山狐狸的猎杀，双妹进宫后却卷入了危机四伏的宫廷权斗的故事。