The difference between Python 2 and Python 3 . dEexams.com

Why should you use Python 3?

Python 3 supports modern techniques like AI, machine learning, and data science.
Python 3 is supported by a large Python developer's community. Getting support is easy.
Its easier to learn Python language compared to earlier versions.
Offers Powerful toolkit and libraries.
Mixable with other languages.

Key differences between Python 2 and 3

Functionality	Python 3	Python 2
Release Date	2008	2000
Function print	print is a function in Python 3. print("hello World")	print is a class in Python 2. print "hello World"
Number 231** or greater	Stored in int.	Stored in long.
Operator <>	Operator <> has been removed	Operator <> can be used.
Division of Integers	Whenever two integers are divided, you get a float value	When two integers are divided, you always provide integer value.
Function returns	Most of the function returns iterable objects and it's more memory optimized	Most of the function returns the built-in object .
Character written in a file	Number of characters written to file is returned	Number of characters written to file is not returned
User input	function raw_input was replaced with input in Python 3	In Python 2, you have a built-in function raw_input() to take input from user
Unicode	In Python 3, default storing of strings is Unicode.	To store Unicode string value, you require to define them with "u".
Syntax	The syntax is simpler and easily understandable.	The syntax of Python 2 was comparatively difficult to understand.
Rules of ordering Comparisons	In this version, Rules of ordering comparisons have been simplified.	Rules of ordering comparison are very complex.
Iteration	The new Range() function introduced to perform iterations.	In Python 2, the xrange() is used for iterations.
Exceptions	It should be enclosed in parenthesis.	It should be enclosed in notations.
Leak of variables	The value of variables never changes.	The value of the global variable will change while using it inside for-loop.
Backward compatibility	Not difficult to port python 2 to python 3 but it is never reliable.	Python version 3 is not backwardly compatible with Python 2.
Library	Many recent developers are creating libraries which you can only use with Python 3.	Many older libraries created for Python 2 is not forward-compatible.

Aditya on Apr 16, 2020 at 02:04 am

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