This relies on the fact that Python's sort is stable, meaning that items that compare equal are never reordered. The tuple should be passed as an argument to the sorted() function. In : sorted(temp, key=itemgetter(1), reverse=True) In Python, use the sorted() built-in function to sort a Tuple. To do this, sort on one component at a time, starting with the least significant one: In : temp = sorted(list_of_medals, key=itemgetter(0)) A single field can be specified as a string. This performs the in-place method of sorting. When a is an array with fields defined, this argument specifies which fields to compare first, second, etc. To do that, we have the key function return a tuple whose first element is the length of the fruit’s name, and second element is. Since sorted() returns a list, it must be converted to a string or tuple. Activity: 16.5.1 ActiveCode (ac1850) In the code below, we are going to sort a list of fruit words first by their length, smallest to largest, and then alphabetically to break ties among words of the same length. The tuple is similar to lists since the value of the items stored in the list can be changed. On the other hand, you can specify not only lists but also strings and tuples to the sorted() function that creates a new sorted list. Sort 2d array python by first element then second element. The negation of x is needed to sort the medals in descending order while sorting country names in ascending order (simply setting reverse=True wouldn't achieve that).Īs several people have pointed out in the comments, a more general way to do a complex sort on a compound key is to perform several sorting steps. Access the second element of each tuple using the nested loops. Since strings and tuples are immutable, there is no sort() method that updates the original object. This sort will preserve the order you have them in already (this sort may also be unnecessary depending on your data). First gather them together using sorted based on the tuples' second element, then throw them in a list with groupby based on the second element. In this instance, I'd use a lambda function as the key argument to sort()/ sorted(): In : sorted(list_of_medals, key=lambda x:(-x,x)) IIUC, you can group tuples by the second element.
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