How to Sort a List of Tuples by Their Integer Second Item in Python?

Sorting Tuples by Second Item (Integer Value)

Sorting a list of tuples by the second item, an integer value, can be achieved using Python's built-in sorted() function. The key keyword argument allows you to specify a function that retrieves the comparable element from each tuple.

Solution:

sorted_tuples = sorted(
    [('abc', 121), ('abc', 231), ('abc', 148), ('abc', 221)],
    key=lambda x: x[1]
)

In this example, lambda x: x[1] is a function that extracts the second item from a tuple. sorted() sorts the list by ascending order of this second item.

Optimization:

For improved performance, you can use operator.itemgetter(1) as the key instead of lambda. itemgetter() is a more optimized way to retrieve a specific item from a tuple.

from operator import itemgetter

sorted_tuples = sorted(
    [('abc', 121), ('abc', 231), ('abc', 148), ('abc', 221)],
    key=itemgetter(1)
)

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