How to Sort a list of Tuples by Second Value in Python

John on May 13, 2021

In this tutorial, we will learn how to sort a list of tuples in ascending order by the second value of each tuple in Python.

To do this, use the Python sort() function and pass a lambda function that accesses the second element of the tuple as the key value.

tuples = [(3,4), (5,1), (1, 3)]

tuples.sort(key=lambda x:x[1])

print(tuples)

[(5, 1), (1, 3), (3, 4)]

sort() modifies the original list so it is not necessary to store the result in a new variable.