How to Check if a String has a Special Character in Python

Submitted by razormist on Wednesday, October 9, 2024 - 23:45.

In this tutorial, we will program "How to Check if a String Contains a Special Character in Python." We will learn how to identify whether a string contains any special characters. The objective is to safely and accurately detect the presence of special characters within a given string. I will provide a sample program to demonstrate the coding process.

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 for special characters in a string. I’ll also provide a simple method to achieve this efficiently. 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 has_special_char(s):
    for c in s:
        if not (c.isalpha() or c.isdigit() or c == ' '):
            return True
    return False
 
ret = False
 
while True:
    print("\n================= Check if a String has a Special Character =================\n\n")
 
    s = input("Enter a string: ")
    if has_special_char(s):
        print("\nThe string has special characters.")
    else:
        print("\nThe string don't have special characters.")
 
    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 Python script checks if a user-provided string contains any special characters. The has_special_char() function iterates through each character in the string and returns True if it encounters a character that is not a letter, digit, or space. If the string contains special characters, the program displays a message indicating so. Otherwise, it informs the user that the string doesn't contain any special characters. The program runs in a loop, allowing the user to try again until they choose to exit.

Output:

There you have it we successfully created How to Check if a String has a Special Character 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!

More Tutorials for Python Language

Python Tutorials