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Python program to Sort a List of Tuples in Increasing Order by the Last Element in Each Tuple

  • Difficulty Level : Basic
  • Last Updated : 26 Nov, 2020

The task is to write a Python Program to sort a list of tuples in increasing order by the last element in each tuple.

Input: [(1, 3), (3, 2), (2, 1)]
Output: [(2, 1), (3, 2), (1, 3)]
Explanation: sort tuple based on the last digit of each tuple.

Methods #1: Using sorted().

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Sorted() method sorts a list and always returns a list with the elements in a sorted manner, without modifying the original sequence.


  • Take a list of tuples from the user.
  • Define a function that returns the last element of each tuple in the list of tuples.
  • Define another function with the previous function as the key and sort the list.
  • Print the sorted list.


def last(n):
    return n[-1]  
def sort(tuples):
    return sorted(tuples, key=last)
a=[(1, 3), (3, 2), (2, 1)]


[(2, 1), (3, 2), (1, 3)]

Methods #2: Using Bubble Sort.

Access the last element of each tuple using the nested loops. This performs the in-place method of sorting. The time complexity is similar to the Bubble Sort i.e. O(n^2).


# Python program to sort 
# a list of tuples by the second Item 
# Function to sort the list 
# of tuples by its second item 
def Sort_Tuple(tup):  
    # getting length of list of tuples 
    lst = len(tup)  
    for i in range(0, lst):  
        for j in range(0, lst-i-1):  
            if (tup[j][-1] > tup[j + 1][-1]):  
                temp = tup[j]  
                tup[j]= tup[j + 1]  
                tup[j + 1]= temp  
    return tup  
# Driver Code  
tup =[(1, 3), (3, 2), (2, 1)]


[(2, 1), (3, 2), (1, 3)]

Methods #3: Using sort().

The sort() method sorts the elements of a given list in a specific ascending or descending order.


# Python program to sort a list of 
# tuples by the second Item using sort()  
# Function to sort hte list by second item of tuple 
def Sort_Tuple(tup):  
    # reverse = None (Sorts in Ascending order)  
    # key is set to sort using second element of  
    # sublist lambda has been used  
    tup.sort(key = lambda x: x[-1])  
    return tup  
# Driver Code  
tup = [(1, 3), (3, 2), (2, 1)]
# printing the sorted list of tuples 


[(2, 1), (3, 2), (1, 3)]

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