Skip to content

Courses
Tutorials
Practice
Contests

Python Tutorial
Interview Questions
Python Quiz
Python Glossary
Python Projects
Practice Python
Data Science With Python
Python Web Dev
DSA with Python
Python OOPs

How to Compare Two Iterators in Python

How to compare two lists in Python?

Last Updated : 12 Dec, 2024

Comments

Improve

Suggest changes

Like Article

Like

Report

In Python, there might be a situation where you might need to compare two lists which means checking if the lists are of the same length and if the elements of the lists are equal or not. Let us explore this with a simple example of comparing two lists.

Python

a = [1, 2, 3, 4, 5] b = [1, 2, 3, 4, 5]  # Compare the two lists directly to #Check if they are identical res = a == b print(res)

Output

True

Let’s explore other methods to compare two lists in Python.

Table of Content

Using collections.Counter()
Using sort()
Using sorted()
Using set()
Using all() and zip()

Using collections.Counter()

counter() function of the collections module is used to sort and store the list elements in the form of a dictionary which makes it easier to compare two lists.

Python

import collections    a = [1, 2, 3, 4, 5] b = [5, 4, 3, 2, 1]  # Counter creates a dictionary-like object  res = collections.Counter(a) == collections.Counter(b) print(res)

Output

True

Using sort()

Python list sort() function is used to sort a list in either ascending or descending order. It modifies the original list. Once the lists are sorted, they can be compared using the equality operator.

Python

a = [1, 2, 3, 4, 5] b = [5, 4, 3, 2, 1]  # Using sort() to sort both lists in place. res = a.sort() == b.sort() print(res)

Output

True

Using sorted()

sorted() function does not modify the original list, instead creates a new list object. Once the lists are sorted, they can be compared using the equality operator.

Python

a = [1, 2, 3, 4, 5] b = [5, 4, 3, 2, 1]  # Use the sorted() to create  # sorted copies of the lists  # Sorts the first list a_sorted = sorted(a)  # Sorts the second list b_sorted = sorted(b)  res = a_sorted == b_sorted print(res)

Output

True

Using set()

set() function is used to onvert an object into a set. This method to compare the lists is useful when the elements of the lists are unordered.

Python

a = [1, 2, 3, 4, 5] b = [5, 4, 3, 2, 1]  # Convert the first list to a set a_set = set(a)  # Convert the second list to a set b_set = set(b)  res = a_set == b_set print(res)

Output

True

Using all() and zip()

The all() function along with zip() pairs elements from both lists and checks if all corresponding elements are equal. This method works best if the lists are sorted.

Python

a = [1, 2, 3, 4, 5] b = [5, 4, 3, 2, 1]  # Use the all() function along with zip() to  #compare both lists element by element res = all(x == y for x, y in zip(a, b)) print(res)

Output

False

How to Compare Two Iterators in Python

T

tanyasehr88x

Improve

Article Tags :

Python
Python Programs
python-list
Python list-programs

Practice Tags :

python
python-list

Similar Reads

How to Compare Two Iterators in Python

Python iterators are powerful tools for traversing through sequences of elements efficiently. Sometimes, you may need to compare two iterators to determine their equality or to find their differences. In this article, we will explore different approaches to compare two iterators in Python. Compare T

Python List Comprehension With Two Lists

List comprehension allows us to generate new lists based on existing ones. Sometimes, we need to work with two lists together, performing operations or combining elements from both. Let's explore a few methods to use list comprehension with two lists. Using zip() with List ComprehensionOne of the mo

How to Compare Two Dictionaries in Python

In this article, we will discuss how to compare two dictionaries in Python. The simplest way to compare two dictionaries for equality is by using the == operator. Using == operatorThis operator checks if both dictionaries have the same keys and values. [GFGTABS] Python d1 = {'a': 1, 'b

Two For Loops in List Comprehension - Python

List comprehension is a concise and readable way to create lists in Python. Using two for loops in list comprehension is a great way to handle nested iterations and generate complex lists. Using two for-loopsThis is the simplest and most efficient way to write two for loops in a list comprehension.

Comparing Python Lists Without Order

Sometimes we need to compare two lists without worrying about the order of elements. This is particularly useful when checking if two lists contain the same elements regardless of their arrangement. In this article, we'll explore different ways to compare Python lists without considering order. Usin

How to Zip two lists of lists in Python?

zip() function typically aggregates values from containers. However, there are cases where we need to merge multiple lists of lists. In this article, we will explore various efficient approaches to Zip two lists of lists in Python. List Comprehension provides a concise way to zip two lists of lists

Python - How to Check if two lists are reverse equal

Sometimes, while working with Python lists, we can have a problem in which we need to check if two lists are reverse of each other. This kind of problem can have application in many domains such as day-day programming and school programming. Let's discuss certain ways in which this task can be perfo

Compare Two Xml Files in Python

We are given two XML files and our task is to compare these two XML files and find out if both files are some or not by using different approaches in Python. In this article, we will see how we can compare two XML files in Python. Compare Two XML Files in PythonBelow are the possible approaches to c

Compare Two Csv Files Using Python

We are given two files and our tasks is to compare two CSV files based on their differences in Python. In this article, we will see some generally used methods for comparing two CSV files and print differences. file1.csv contains Name,Age,CityJohn,25,New YorkEmily,30,Los AngelesMichael,40,Chicago fi

Remove common elements from two list in Python

When working with two lists in Python, we may need to remove the common elements between them. A practical example could be clearing out overlapping tasks between two to-do lists. The most efficient way to remove common elements between two lists is by using sets. [GFGTABS] Python a = [1, 2, 3, 4, 5

Corporate & Communications Address:

A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)

Registered Address:

K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305

Advertise with us

Company
About Us
Legal
Privacy Policy
In Media
Contact Us
Advertise with us
GFG Corporate Solution
Placement Training Program

Languages
Python
Java
C++
PHP
GoLang
SQL
R Language
Android Tutorial
Tutorials Archive

DSA
Data Structures
Algorithms
DSA for Beginners
Basic DSA Problems
DSA Roadmap
Top 100 DSA Interview Problems
DSA Roadmap by Sandeep Jain
All Cheat Sheets

Data Science & ML
Data Science With Python
Data Science For Beginner
Machine Learning
ML Maths
Data Visualisation
Pandas
NumPy
NLP
Deep Learning

Web Technologies
HTML
CSS
JavaScript
TypeScript
ReactJS
NextJS
Bootstrap
Web Design

Python Tutorial
Python Programming Examples
Python Projects
Python Tkinter
Python Web Scraping
OpenCV Tutorial
Python Interview Question
Django

Computer Science
Operating Systems
Computer Network
Database Management System
Software Engineering
Digital Logic Design
Engineering Maths
Software Development
Software Testing

DevOps
Git
Linux
AWS
Docker
Kubernetes
Azure
GCP
DevOps Roadmap

System Design
High Level Design
Low Level Design
UML Diagrams
Interview Guide
Design Patterns
OOAD
System Design Bootcamp
Interview Questions

Inteview Preparation
Competitive Programming
Top DS or Algo for CP
Company-Wise Recruitment Process
Company-Wise Preparation
Aptitude Preparation
Puzzles

School Subjects
Mathematics
Physics
Chemistry
Biology
Social Science
English Grammar
Commerce
World GK

GeeksforGeeks Videos
DSA
Python
Java
C++
Web Development
Data Science
CS Subjects

@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved

We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy

Improvement

Suggest Changes

Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.

geeksforgeeks-suggest-icon

Create Improvement

Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.

geeksforgeeks-improvement-icon

Suggest Changes

min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

What kind of Experience do you want to share?

Interview Experiences

Admission Experiences

Career Journeys

Work Experiences

Campus Experiences

Competitive Exam Experiences