How to Add a Key-Value Pair to a Dictionary in Python

Submitted by razormist on Tuesday, July 29, 2025 - 22:56.

In this tutorial, we will learn how to program "How to Add a Key-Value Pair to a Dictionary in Python." The objective is to correctly add a new key-value pair to a dictionary. This tutorial will guide you step by step through the entire process of safely adding keys and values. By the end of this tutorial, you will have a solid understanding of how to implement this task effectively in Python, helping you strengthen your problem-solving abilities and enhance your coding skills.

This topic is straightforward to understand. Just follow the instructions provided, and you will be able to complete it with ease. The program will guide you step by step through the process of adding a key and value to a dictionary. 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.

d = {}
 
while True:
    print("\n=============== Add a Key-Value Pair to a Dictionary ===============\n")
 
    try:
        key = int(input("Enter the key (int) to be added: "))
        value = input("Enter the value for the key to be added: ")
    except ValueError:
        print("Please enter valid integers for both key and value.")
        continue
 
    d[key] = value
    print("Updated dictionary is:")
    print(d)
 
    opt = input("\nDo you want to try again? (yes/no): ").strip().lower()
    
    if opt == 'no':
        print("Exiting program....")
        break
    elif opt != 'yes':
        print("Invalid input. Exiting program....")
        break

This program allows the user to add key-value pairs to a dictionary through a loop. The user is prompted to enter an integer key and a corresponding value. Each new pair is added to the dictionary, which is then displayed. The program continues until the user types "no" or enters an invalid response. Input validation ensures that the key is an integer, and the loop prevents crashes due to invalid inputs.

Output:

There you have it we successfully created How to Add a Key-Value Pair to a Dictionary 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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