How to Interchange First & Last Elements in a List using Python

Submitted by razormist on Thursday, November 28, 2024 - 23:44.

In this tutorial, we’ll learn how to program "How to Interchange First & Last Elements in a List using Python." We’ll focus on swapping the first and last elements of a list. The objective is to carefully swap the positions of these elements in the list. A sample program will be provided to demonstrate the coding process, making it simple and easy to understand. So, let’s get started!

This topic is straightforward to understand. Just follow the instructions I provide, and you'll be able to complete it with ease. The program I'll show you demonstrates the proper way to swap the first and last elements in a list. I'll also provide a simple and efficient method to achieve this effectively. So, let’s start coding!

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.

def interChange(newList):
    size = len(newList)
    
 
    temp = newList[0]
    newList[0] = newList[size - 1]
    newList[size - 1] = temp
    
    return newList
    
 
while True:
    print("\n================= Interchange First & Last Elements in a List =================\n\n")
    mylist = [34, 21, 14, 54, 43]
 
    
    print("Current List: ", mylist)
 
    print("\nNew List: ", interChange(mylist))
 
    opt = input("\nDo you want to try again?(yes/no): ")
 
    if opt.lower() == 'yes':
        ret=False
    elif opt.lower() == 'no':
        ret=True
        print("Exiting program....")
    else:
        print("Please enter yes/no:")
        break
 
    if ret == False:
        continue

This program swaps the first and last elements of a given list and provides the user with the updated list. Initially, the list [34, 21, 14, 54, 43] is displayed as the current list. The function interChange calculates the size of the list, stores the first element in a temporary variable, and then replaces the first element with the last one. The last element is then replaced by the stored first element from the temporary variable. The modified list is then printed as the new list. Afterward, the program prompts the user to decide whether to repeat the process with the same logic or exit the program.

Output:

There you have it we successfully created How to Interchange First & Last Elements in a List using Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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