Python
Python String count() with EXAMPLES
Python count The count() is a built-in function in Python. It will return the total count of a...
Python 2 made code development process easier than earlier versions. It implemented technical details of Python Enhancement Proposal (PEP). Python 2.7 (last version in 2.x ) is no longer under development and in 2020 will be discontinued.
In this tutorial, you will learn,
On December 2008, Python released version 3.0. This version was mainly released to fix problems which exist in Python 2. The nature of these change is such that Python 3 was incompatible with Python 2. It is backward incompatible Some features of Python 3 have been backported to Python 2.x versions to make the migration process easy in Python 3.
As a result, for any organization who was using Python 2.x version, migrating their project to 3.x needed lots of changes. These changes not only relate to projects and applications but also all the libraries that form part of the Python ecosystem.
Although, Python 2 is an old open source version here are where you still need to learn Python 2:
Here, are prime reasons for using Python 3.x versions:
Basis of comparison | Python 3 | Python 2 |
---|---|---|
Release Date | 2008 | 2000 |
Function print | print ("hello") | print "hello" |
Division of Integers | Whenever two integers are divided, you get a float value | When two integers are divided, you always provide integer value. |
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. |
Python 3
def main(): print("Hello World!") if __name__== "__main__": main()
Python 2
def main(): print "Hello World!" if __name__== "__main__": main()
When it comes to Python version 2 vs. 3 today, Python 3 is the outright winner. That's because Python 2 won't be available after 2020. Mass Python 3 adoption is the clear direction of the future.
After considering declining support for Python 2 programming language and added benefits from upgrades to Python 3, it is always advisable for a new developer to select Python version 3. However, if a job demands Python 2 capabilities, that would be an only compelling reason to use this version.
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