Home >Backend Development >Python Tutorial >How to Sort a List of Tuples with One Key in Reverse Order in Python?

How to Sort a List of Tuples with One Key in Reverse Order in Python?

Barbara Streisand
Barbara StreisandOriginal
2024-11-01 17:48:02953browse

How to Sort a List of Tuples with One Key in Reverse Order in Python?

Sorting a List with Two Keys, One in Reverse Order

In Python, sorting a list of tuples by two keys is straightforward. However, there may be cases where you need to sort one key in ascending order and another key in descending order.

Suppose you have a list with tuples like:

<code class="python">myList = [(ele1A, ele2A),(ele1B, ele2B),(ele1C, ele2C)]</code>

To sort this list using two keys, you can use sorted():

<code class="python">sortedList = sorted(myList, key=lambda y: (y[0].lower(), y[1]))</code>

This code sorts the list by the first key in ascending order and the second key in ascending order.

To sort the list in reverse order for one key, you can use a negative sign:

<code class="python">sortedList = sorted(myList, key=lambda y: (y[0].lower(), -y[1]))</code>

Here, the first key is still sorted in ascending order, but the second key is sorted in descending order.

You can try the following code snippets to see the different sorting results:

<code class="python">sortedList = sorted(myList, key=lambda y: (y[0].lower(), -y[1]))
sortedList = sorted(myList, key=lambda y: (-y[0].lower(), y[1]))
sortedList = sorted(myList, key=lambda y: (-y[0].lower(), -y[1]))</code>

The above is the detailed content of How to Sort a List of Tuples with One Key in Reverse Order in Python?. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn