Sorting a list of tuples in increasing order by the last element in each tuple is a common task in programming. Tuples are ordered collections of elements, and sometimes you might want to sort a list of tuples based on a specific element within each tuple.
You are given a list of tuples, where each tuple contains a sequence of elements. Your task is to implement a function in Python that sorts this list of tuples in increasing order based on the last element of each tuple.
Python Program to Sort a List of Tuples in Increasing Order by the Last Element in Each Tuple
def sort_tuples_by_last_element(lst): return sorted(lst, key=lambda x: x[-1]) # Example list of tuples tuple_list = [(1, 4), (3, 2), (8, 9), (5, 7)] sorted_list = sort_tuples_by_last_element(tuple_list) print(sorted_list)
How it Works
- Defining the Function: We start by defining the
sort_tuples_by_last_element(lst)function. This function takes a list of tuples
lstas an argument.
- Using the
sorted()Function: Inside the function, we use the
sorted()function to perform the sorting. The
sorted()function takes two important parameters:
iterable: This is the list of tuples we want to sort.
key: This is a function that takes an element from the
iterableand returns a value based on which the sorting is done.
- Lambda Function for Sorting: In the
keyparameter of the
sorted()function, we use a lambda function to specify that we want to sort based on the last element of each tuple. The lambda function
lambda x: x[-1]takes a tuple
xand returns its last element, which is used for sorting.
- Result: The
sorted()function returns a new list containing the sorted tuples. This list is assigned to the
- Returning the Result: Finally, the
sort_tuples_by_last_element()function returns the