Write an index_function that will generate a key that can be used for sorting each element of the unsorted list.
编写一个index_function生成一个键，该键用于对未排序列表的元素进行排序。
No matter how well you manage your bookmarks, chances are that there'd be a good number of unsorted bookmarks in your list.
不论你书签管理得多好，列表中总会有一些未分类的。
No matter how well you manage your bookmarks, chances are that there'd be a good number of unsorted bookmarks in your list.
不论你书签管理得多好，列表中总会有一些未分类的。
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