Find Characters Present in First String but Missing in Second Using Python

Submitted by razormist on Monday, September 15, 2025 - 23:26.

In this tutorial, we will learn how to program "Find Characters Present in the First String but Missing in the Second Using Python." The objective is to identify characters that appear in the first string but are absent from the second. This tutorial will guide you step by step through the process of finding those characters. 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. Simply follow the instructions provided, and you will complete it with ease. The program will guide you step by step through the process of finding the characters present in the first string but missing in the second. 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.

while True:
    print("\n======== Find Characters Present in First String but Missing in Second ========\n")
 
    s1 = input("Enter first string: ")
    s2 = input("Enter second string: ")
 
    # Find characters in s1 but not in s2
    missing = sorted(set(s1) - set(s2))
 
    if missing:
        print("The letters are:")
        for char in missing:
            print(char)
    else:
        print("No unique letters found in the first string.")
 
    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 creates a dictionary from two user-input lists. It first asks how many elements the dictionary should have, then collects the keys and values separately. Using the `zip()` function, it pairs each key with its corresponding value to form the dictionary, which is then displayed. The program runs in a loop, allowing the user to repeat the process until they choose to exit.

Output:

There you have it we successfully created Find Characters Present in First String but Missing in Second 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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