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Editor to share with you how python uses keys in sorting, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Use key when sorting (key)

There is a lot of old Python sorting code that takes your time when you create a custom sort, but does speed up the sorting process at run time. The best way to sort elements is to use the key (key) and the default sort () sorting method whenever possible. For example, consider the following code:

Import operatorsomelist = [(1,5,8), (6,2,4), (9,7,5)] somelist.sort (key=operator.itemgetter (0)) somelist#Output = [(1,5,8), (6,2,4), (9,7,5)] somelist.sort (key=operator.itemgetter (1)) somelist#Output = [(6,2,4), (1,5,8), (9,7,5)] somelist.sort (key=operator.itemgetter (2)) somelist

In each instance, the array is sorted according to the index you selected as part of the key parameter. Similar to sorting using numbers, this method also applies to sorting using strings.

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