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How to Check if the String is Already Existed in Python

Submitted by razormist on Saturday, September 28, 2024 - 23:33.

In this tutorial, we will program "How to Check if a String Already Exists in Python." We will learn how to properly check if the entered string already exists. The objective is to correctly determine if the string has already been input. I will provide a sample program to demonstrate the coding process in this tutorial.

This topic is very easy to understand. Just follow the instructions I provide, and you'll be able to do it yourself with ease. The program I’ll show you demonstrates the proper way to check if a string already exists. I'll do my best to provide a simple method for achieving this. 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.
  1. def check(s2, s1):
  2.     if (s2.count(s1) > 0):
  3.         print("This string is already existed.")
  4.     else:
  5.         print("This string is not existed.")
  6.  
  7.  
  8.  
  9. ret = False
  10.  
  11. while True:
  12.     print("\n================= Check if the String is Already Existed =================\n\n")
  13.  
  14.  
  15.     s2 = "Free Source Code for Everyone"
  16.     s1 = input("Enter a string: ")
  17.     check(s2, s1)
  18.  
  19.     opt = input("\nDo you want to try again?(yes/no): ")
  20.  
  21.     if opt.lower() == 'yes':
  22.         ret=False
  23.     elif opt.lower() == 'no':
  24.         ret=True
  25.         print("Exiting program....")
  26.  
  27.     else:
  28.         print("Please enter yes/no:")
  29.         break
  30.  
  31.     if ret == False:
  32.         continue

This Python script checks if a user-provided string (s1) exists within a predefined string (s2). It uses the count() function to check how many times s1 appears in s2. If the count is greater than zero, it prints that the string already exists. Otherwise, it indicates that the string does not exist. The program runs in a loop, allowing the user to try again until they decide to exit.

Output:

There you have it we successfully created How to Check if the String is Already Existed 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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