Check if a given string is binary string or not - Python Last Updated : 01 Nov, 2025 Comments Improve Suggest changes 7 Likes Like Report Try it on GfG Practice A binary string is a string that contains only the characters '0' and '1'. For example, "101010" is a binary string, while "10201" is not. Our task is to check if a given string is a binary string or not.Using all()all() function in Python is a built-in method that returns True if all elements of an iterable satisfy a given condition, and False otherwise. Python s = "101010000111" if all(c in '01' for c in s): print("Yes") else: print("No") OutputYes Explanation:all(c in '01' for c in s): creates a generator that iterates through each character in s.Checks if each character belongs to the set {'0','1'}.Short-circuit evaluation: all() stops immediately if a character fails the condition, making it fast for large strings.Using set()set() can be used to quickly identify the unique characters in a string. Python s = "101010000111" if set(s).issubset({'0', '1'}): print("Yes") else: print("No") OutputYes Explanation: set(s): converts the string into a set of unique characters.issubset({'0', '1'}): checks if all unique characters are either '0' or '1'.Efficient for strings with repeated characters as it reduces unnecessary checks.Using Regular ExpressionsRegular expressions (regex) provide a powerful and flexible way to match patterns in strings. Python import re s = "101010000111" if re.fullmatch('[01]+', s): print("Yes") else: print("No") OutputYes Explanation:[01]+ matches one or more occurrences of '0' or '1'.re.fullmatch(): ensures the entire string matches the pattern.Regex is powerful and concise but slightly slower than all() or set-based checks for simple patterns.Using a for LoopA simple for loop can iterate through each character of the string and manually check whether it is '0' or '1'. Python s = "101010000111" for char in s: if char not in '01': print("No") break else: print("Yes") OutputYes Explanation:Iterates through each character, checking membership in '01'.Stops immediately when an invalid character is found using break.Simple to understand, but concatenation or repeated membership checks are slower than generator-based all().Related Articles:Check for Binary StringCheck if two binary strings can be made equal by swapping 1s occurring before 0s Create Quiz Comment P priyankamaurya Follow 7 Improve P priyankamaurya Follow 7 Improve Article Tags : Python Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 4 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 3 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 3 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 3 min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 6 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 5 min read Build a REST API using Flask - Python 3 min read Building a Simple API with Django REST Framework 3 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like