• Home
  • Subscribe
  • Contribute Us
    • Share Your Interview Experience
  • Contact Us
  • About
    • About CSEstack
    • Campus Ambassador
  • Forum & Discus
  • Tools for Geek
  • LeaderBoard
CSEstack

What do you want to Learn Today?

  • Programming
    • Tutorial- C/C++
    • Tutorial- Django
    • Tutorial- Git
    • Tutorial- HTML & CSS
    • Tutorial- Java
    • Tutorial- MySQL
    • Tutorial- Python
    • Competitive Coding Challenges
  • CSE Subject
    • (CD) Compiler Design
    • (CN) Computer Network
    • (COA) Computer Organization & Architecture
    • (DBMS) Database Management System
    • (DS) Data Structure
    • (OS) Operating System
    • (ToA) Theory of Automata
    • (WT) Web Technology
  • Interview Questions
    • Interview Questions- Company Wise
    • Interview Questions- Coding Round
    • Interview Questions- Python
    • Interview Questions- REST API
    • Interview Questions- Web Scraping
    • Interview Questions- HR Round
    • Aptitude Preparation Guide
  • GATE 2022
  • Linux
  • Trend
    • Full Stack Development
    • Artificial Intelligence (AI)
    • BigData
    • Cloud Computing
    • Machine Learning (ML)
  • Write for Us
    • Submit Article
    • Submit Source Code or Program
    • Share Your Interview Experience
  • Tools
    • IDE
    • CV Builder
    • Other Tools …
  • Jobs

What is the Difference Between is and == in Python?

Aniruddha Chaudhari/23229/0
CodePython

It’s really confusing for Python programmer. When to use ‘is’? When to use ‘==’?

And what is the Difference Between is and == in Python?

Before getting into the difference here is quick syntax, you should understand.

A syntax for “is” expression:

a is b

A Syntax for “==” (equals) expression:

a == b

Note: Where ‘a’ and ‘b’ are two different Python objects.

If we consider it as a native language, both expression seems to be doing the same work. But does not hold true for Python.

So to find the difference between them, let’s make it simple.

I will give you quick demonstration by using ”is” and “==” expressions with Python list.

Difference Between is and == in Python | “is” vs “==”

  • The “is” expressions in Python evaluates and returns to True if two variables point to the same Python data object.
  • The “==” expression holds True if the objects referred to by the variables are equal.

Without getting heedless, let’s take the example of using “is” and “==” on the Python list.

“is” expression with List object: 

a = [1, 2, 3]

b = a
a is b
#True

c = list(a)
a is c
#False

So are you surprised by the output?

  • When you use “b = a”, it does not create a new list. In fact, it creates a pointer pointing to the same list. As ‘a’ and ‘b’ points to the same list, ‘is’ expression returns True.
  • When you use “c = list(a)”, it copies all the list values from list ‘a’ and creates a new list object. Now list ‘a’ and ‘c’ have the same data but occupies a different memory location. As ‘a’ and ‘c’ are two different lists, ‘is’ expression returns False.

Then how “==” (equals) is different from “is”?

“==” expression with List object:

a = [1, 2, 3]

b = a
a == b
#True

c = list(a)
a == c
#True

  • As told above, expression “b = a” does not create a new list so the content will be the same pointed by two different list objects. So it will return True if you do “a == b”.
  • “c = list(a)” creates new list but both the list carries same data contents. So “a == c” evaluates to True.

Related read to explore Python List:

  • How to Randomly Select Item from List in Python?
  • How to Find Unique Elements from List in Python?

This is all about the Difference Between is and == in Python. I know its little confusing. If you have any comment, feel free to write below.

Python Interview Questions eBook

Pythonpython list
Aniruddha Chaudhari
I am complete Python Nut, love Linux and vim as an editor. I hold a Master of Computer Science from NIT Trichy. I dabble in C/C++, Java too. I keep sharing my coding knowledge and my own experience on CSEstack.org portal.

Your name can also be listed here. Got a tip? Submit it here to become an CSEstack author.

Leave a Reply Cancel reply

Basic Python Tutorial

  1. Python- Tutorial Overview
  2. Python- Applications
  3. Python- Setup on Linux
  4. Python- Setup on Windows
  5. Python- Basic Syntax
  6. Python- Variable Declaration
  7. Python- Numeric Data Types
  8. Python- NoneType
  9. Python- if-else/elif
  10. Python- for/while else
  11. Python- User Input
  12. Python- Multiline User Input
  13. Python- String Formatting
  14. Python- Find Substring in String
  15. Python- Bitwise Operators
  16. Python- Range Function
  17. Python- List
  18. Python- List Vs Tuple
  19. Python- Compare Two Lists
  20. Python- Sorting List
  21. Python- Delete Element from List
  22. Python- Dictionary
  23. Python- ‘is’ vs ‘==’
  24. Python- Mutable vs Immutable
  25. Python- Generator & Yield
  26. Python- Fibonacci Generator
  27. Python- Assert Statement
  28. Python- Exception Handling 
  29. Python- RegEx
  30. Python- Lambda Function
  31. Python- Installing Modules
  32. Python- Important Modules
  33. Python- Find all Installed Modules
  34. PyCharm- IDE setup
  35. Python- File Handling
  36. Python- Monkey Patching
  37. Python- Decorators
  38. Python- Instance vs Static vs Class Method
  39. Python- Name Mangling
  40. Python- Working with GUI
  41. Python- Read Data from Web URL
  42. Python- Memory Management
  43. Python- Virtual Environment
  44. Python- Calling C Function

Python Exercise

  1. Python- Tricky Questions
  2. Python- Interview Questions (60+)
  3. Python- Project Ideas (45+)
  4. Python- MCQ Test Online
  5. Python- Coding Questions (50+)
  6. Python- Competitive Coding Questions (20+)

Python String

  1. Reverse the String
  2. Permutations of String
  3. Padding Zeros to String/Number

Python List

  1. Randomly Select Item from List
  2. Find Unique Elements from List
  3. Are all Elements in List Same?

Python Dictionary

  1. Set Default Value in Dictionary
  2. Remove all 0 from a dictionary

File Handling

  1. Python- Read CSV File into List
  2. Check if the File Exist in Python
  3. Find Longest Line from File

Compilation & Byte Code

  1. Multiple Py Versions on System
  2. Convert .py file .pyc file
  3. Disassemble Python Bytecode

Algorithms

  1. Sorting- Selection Sort
  2. Sorting- Quick Sort

Other Python Articles

  1. Clear Py Interpreter Console
  2. Can I build Mobile App in Python?
  3. Extract all the Emails from File
  4. Python Shell Scripting

© 2022 – CSEstack.org. All Rights Reserved.

  • Home
  • Subscribe
  • Contribute Us
    • Share Your Interview Experience
  • Contact Us
  • About
    • About CSEstack
    • Campus Ambassador
  • Forum & Discus
  • Tools for Geek
  • LeaderBoard