Infinite Iterators in Python Last Updated : 12 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Iterator in Python is any python type that can be used with a ‘for in loop’. Python lists, tuples, dictionaries, and sets are all examples of inbuilt iterators. But it is not necessary that an iterator object has to exhaust, sometimes it can be infinite. Such type of iterators are known as Infinite iterators. Python provides three types of infinite iterators - count(start, step): This iterator starts printing from the “start” number and prints infinitely. If steps are mentioned, the numbers are skipped else step is 1 by default. See the below example for its use with for in loop. Example: Python3 1== # Python program to demonstrate # infinite iterators import itertools # for in loop for i in itertools.count(5, 5): if i == 35: break else: print(i, end =" ") Output: 5 10 15 20 25 30 cycle(iterable): This iterator prints all values in order from the passed container. It restarts printing from beginning again when all elements are printed in a cyclic manner. Example #1: Python3 1== # Python program to demonstrate # infinite iterators import itertools count = 0 # for in loop for i in itertools.cycle('AB'): if count > 7: break else: print(i, end = " ") count += 1 Output: A B A B A B A B Example #2: Using next function. Python3 1== # Python program to demonstrate # infinite iterators import itertools l = ['Geeks', 'for', 'Geeks'] # defining iterator iterators = itertools.cycle(l) # for in loop for i in range(6): # Using next function print(next(iterators), end = " ") Output: Geeks for Geeks Geeks for Geeks repeat(val, num): This iterator repeatedly prints the passed value infinite number of times. If the optional keyword num is mentioned, then it repeatedly prints num number of times. Example: Python3 1== # Python code to demonstrate the working of # repeat() # importing "itertools" for iterator operations import itertools # using repeat() to repeatedly print number print ("Printing the numbers repeatedly : ") print (list(itertools.repeat(25, 4))) Output: Printing the numbers repeatedly : [25, 25, 25, 25] Comment More infoAdvertise with us N nikhilaggarwal3 Follow Improve Article Tags : Python Python-itertools Practice Tags : python Explore Python FundamentalsPython Introduction 3 min read Input and Output in Python 4 min read Python Variables 6 min read Python Operators 5 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 7 min read Python Functions 8 min read Recursion in Python 6 min read Python Lambda Functions 6 min read Python Data StructuresPython String 6 min read Python Lists 6 min read Python Tuples 6 min read Dictionaries in Python 7 min read Python Sets 10 min read Python Arrays 9 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 6 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 2 min read Python MySQL 9 min read Python Packages 12 min read Python Modules 7 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 11 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 6 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library- Tutorial 4 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 7 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 10 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 7 min read Python | Build a REST API using Flask 3 min read How to Create a basic API using Django Rest Framework ? 4 min read Python PracticePython Quiz 3 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like