How to Check if a String is a Binary String in Python

Submitted by razormist on Sunday, March 9, 2025 - 22:28.

In this tutorial, we’ll learn how to program “How to Check if a String is a Binary String in Python.” The objective is to safely check whether a string represents a binary number. This tutorial will guide you through the proper method for determining if a string is binary. So, let’s get started!

This topic is straightforward to understand. Just follow the instructions I provide, and you’ll complete it with ease. The program I’ll demonstrate will illustrate the correct way to check if a string is a binary number. 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.

import re
 
 
while True:
    print("\n================= Check if a String is a Binary String =================\n\n")
 
 
    s = input("Enter a number: ")
 
    if re.fullmatch('[01]+', s):
        print("This is a binary number!")
    else:
        print("This is not a binary number!")
 
 
    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 program checks whether a given string consists only of binary digits (0s and 1s) using regular expressions. If the string matches the pattern [01]+, it is classified as a binary number; otherwise, it is not. The program then asks the user if they want to try again or exit.

Output:

There you have it we successfully created How to Check if a String is a Binary String 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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