Python中的注解“@”
https://blog.csdn.net/fanxu19861001/article/details/70226204?spm=1001.2101.3001.6650.16&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-16-70226204-blog-140644969.235%5Ev43%5Epc_blog_bottom_relevance_base9&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-16-70226204-blog-140644969.235%5Ev43%5Epc_blog_bottom_relevance_base9