How to Reverse the Last i Elements in an Array in Python

Описание: Discover how to easily reverse the last i elements of a list in Python with a simple step-by-step guide and example!
---
This video is based on the question https://stackoverflow.com/q/62715273/ asked by the user 'dheeraj' ( https://stackoverflow.com/u/6771272/ ) and on the answer https://stackoverflow.com/a/62715274/ provided by the user 'dheeraj' ( https://stackoverflow.com/u/6771272/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Reverse last i element in array python

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction

Are you looking to manipulate lists in Python? Specifically, do you need to reverse the last few elements of an array (or list) efficiently? If so, you’ve come to the right place! In this guide, we’re going to tackle a common problem: reversing the last i elements of a list in Python.

Let’s dive right in with a practical example that clearly demonstrates the problem and the straightforward solution.

The Problem Statement

Suppose you have a list of integers like so:

[[See Video to Reveal this Text or Code Snippet]]

Imagine you want to reverse the last 3 elements, turning the original list into this:

[[See Video to Reveal this Text or Code Snippet]]

How do you accomplish this effectively in Python?

Solution Overview

To reverse the last i elements in an array (or list), we can follow a simple approach using Python’s list slicing capabilities. Here’s a breakdown of the steps:

Determine the number of elements to reverse.

Slice the list into two parts: all but the last i elements and the last i elements.

Reverse the sliced section of the list.

Concatenate the two parts back together.

Let's implement this step-by-step in code.

Step-by-Step Implementation

Step 1: Create your list and define the count

First, you need to create your list and decide how many elements you want to reverse.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Slice the list

Now, we’ll slice the list so that we keep all elements except for the last count elements.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Reverse the last count elements

Next, we reverse the last count elements:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Concatenate and print the result

Finally, we combine the two parts and print the resulting list:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s the complete code snippet for clarity:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Reversing the last i elements of an array in Python isn't as daunting as it may seem. By applying Python's list slicing and concatenation features, we achieve a clean solution that is both efficient and easy to understand.

Feel free to play around with different lists and counts to see how this method operates! Happy coding!