![]() 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)) All we do is call sort on the list, for in-place. Say we have a list of numbers: python > a 3, 6, 8, 2, 78, 1, 23, 45, 9 /python And we want to sort them in ascending order. The in-place sort returns a value of none but the original list is sorted. Okay, so if you only want to sort a list of numbers, Python has a built in function that does all the hard work for you. Sorting Python Lists in Lexicographic Order. The lambda expression sorts the list by the second element of the tuple value and updates the original. Only if theres a tie, it takes the second tuple value and so on. This performs the in-place method of sorting. sorted(ls, keylambda t: t0) Or convert the whole thing to a structured numpy array and ask numpy to sort it. The arguement x is the iterable element ( tuple) to be sorted by the second element, the number. Access the second element of each tuple using the nested loops. Either tell python to sort only on the first item. We can use the following code to sort the rows of the NumPy array in ascending order based on the values in the second column: define new matrix with rows. Note: You cannot sort a list that contains BOTH string values AND numeric values. Strings are sorted alphabetically, and numbers are sorted numerically. Let’s define a function called seconditem(), which takes a tuple as a parameter and returns the second item of the tuple. You can specify ascending or descending order. The list.sort() method key parameter is set to lambda. The sorted () function returns a sorted list of the specified iterable object. The newList is listed in reverse numerical descending order. 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) The list is sorted on the second element of the tuple which is the number, and the reverse parameter is set to true. 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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