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7. Os.path.isfile ()--Determines whether the specified object is a file. Yes returns True, otherwise FalseThe reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.——总不能养你吃白饭是不是。大卫把自己的一套公寓出租，结果却引来了一个叫伊丽莎白的漂亮姑娘，她宣称自己才是这套公寓的拥有者，就在大卫考虑把这个纠纷拿到法庭上解决时，伊丽莎白竟然又突然消失了。从此以后，这个姑娘就幽灵一样随时随地出现在大卫的生活中，焦头烂额的大卫怀疑伊丽莎白是以前生活在这所公寓里的鬼魂，于是试图帮助她接受自己已死的现实……　　,他们一直在一起,直到Kuea一家搬到英国居住。当Kuea上小学时,他们分开了,Kuea Keerati跟着父母一直居住在英国,直到长大。而Gilayn Wang拥有一家夜总会并经营着家族企业。熊孩子挑食不吃饭？没关系，来小虎厨房吧！带孩子们把各种食材做成好吃又好玩的美食，香糯的熊猫饭团，酥脆的小兔子吐司，是不是已经看花眼啦！来跟小虎哥哥，小小虎助手一起共度美味时光吧！` ` ` ` ` ` `