![]() Printing the planets list shows it is updated, and sorted in ascending order of the second element of the tuple.The output displays the result of the lambda expression passed in for the key parameter of list.sort(): print("In-Place Sort: ",planets.sort(key = lambda x : x)) The in-place sort returns a value of none but the original list is sorted. The lambda expression sorts the list by the second element of the tuple value and updates the original. To customize the default sorting behavior, use the optional key argument by passing a. The arguement x is the iterable element ( tuple) to be sorted by the second element, the number. sort() method sorts the list elements in place in an ascending manner. The list.sort() method key parameter is set to lambda. Python has a very nice way to do this, the key function. ![]() The newList is listed in reverse numerical descending order. Python has its own implementation of sort() function, and another is sorted() function where sort() will sort list whereas, the sorted function will return new sorted list from an iterable. Say you have a list of strings, and you want to sort in a way other than alphabetic. The sorted() function returns a new list object, assigned to the newList variable. This output shows the lambda function change the default sorted() function parameter values. newList = sorted(planets, key = lambda x : x,reverse=True) Python sort is a method that we can use to arrange lists in ascending order or based on any criteria that we give it. The list is sorted on the second element of the tuple which is the number, and the reverse parameter is set to true. The function will return a number that will be used to sort the list (the lowest number first): Example. The sorted() function takes the planets list as data, the lambda sets the function key parameter. The following examples will be used to illustrate how lambda functions can enhance or extend the functionality of the list.sort() method and sorted() function using the key parameter. We’ll use the planet list of tuples in the following example: //List of Tuples Declaration
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