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!

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