How to Print Duplicates from a List of Integers in Python

Submitted by razormist on Saturday, June 13, 2026 - 23:35.

In this tutorial, we will learn how to program "How to Print Duplicates from a List of Integers in Python". The objective is to find and print duplicate integers from a list. This tutorial will guide you step by step through the process of identifying duplicates in a list of integers. By the end of this tutorial, you will have a solid understanding of how to implement this solution effectively in Python, helping you strengthen your problem-solving abilities and improve your coding skills.

This topic is straightforward and easy to understand. By following the instructions provided, you will be able to complete it with ease. The program will guide you step by step through the process of printing duplicates from a list of integers. So, let’s dive into the coding process!

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.

from collections import Counter
 
# MAIN LOOP
while True:
    print("\n============= Print Duplicates from a List of Integers =============\n")
 
    try:
        # Input list
        a = list(map(int, input("Enter integers separated by spaces: ").split()))
 
        if not a:
            print("The list cannot be empty.")
            continue
 
        # Count frequencies
        count = Counter(a)
 
        # Find duplicates
        res = [num for num, freq in count.items() if freq > 1]
 
        if res:
            print("\nDuplicate elements:", res)
        else:
            print("\nNo duplicate elements found.")
 
    except ValueError:
        print("Invalid input. Please enter integers only.")
        continue
 
    # Try Again Option
    opt = input("\nDo you want to try again? (yes/no): ").strip().lower()
 
    if opt == 'no':
        print("Exiting program...")
        break
    elif opt != 'yes':
        print("Invalid choice. Exiting program...")
        break

This program identifies duplicate elements in a list of integers using Python’s `Counter` from the `collections` module. It takes user input, counts the frequency of each number, and extracts those that appear more than once. The program then displays all duplicate elements, or informs the user if no duplicates are found, and repeats until the user chooses to exit.

Output:

There you have it we successfully created How to Print Duplicates from a List of Integers in 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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