Guide to Python 3 - SkillBakery Studios


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Saturday, May 16, 2020

Guide to Python 3

Guide to Python 3

Welcome! Are you a beginner in programming language with a basic understanding of programming?
Then this is the right place for you to start and pick with the most widely used and easy language python. All you need is a basic programming.

What is python?

Python is an object oriented high-level interpreted language which has dynamic semantics and easy syntax. Python is an easy open source language as compared to other programming languages.
Python helps in creating GUI applications, web applications much easier than other language.
Python was first developed by Guido Vann Rossum in 1989.

Python is an interpreted language

Python is an interpreted language, when we run any python program an interpreter is used to parse program line by line as compared to compiled language, where the whole program compiles first and then run.

Basic difference in interpreter and compiler is that for compiled language (C, C++) we have to code all the basic functions and have to create data structures to solve minor problems.

Here python came to the rescue, in python you don’t need to define any data or create structures for small issues because python has everything a beginner needs in his project.

Python has thousands of libraries which can be used as per the requirement.
Many companies are using data analysis to track analyses and use insights to make better decisions. Python is the most popular language used for Data Analysis.

In python the steps to start with GUI is not complex. It’s a general purpose programming language with interpreters across all operating system, there are many options available for programmers to create and interact easily with the programs and UI.

Pythonis widely and mostly used for developing web applications that are difficult to develop using other languages like .NET and PHP as Python is very much powerful in supporting many ultra-features that is easily executed with the frameworks like Django, Flask, web2py and many more.

To build career in data science you just need to know how to play around the data how to import, visualize and manipulate data. All features are integrated for aspiring data science professional.

You’ll get hands-on with some of the most popular Python libraries, including pandas, Matplotlib, NumPy, and many more.

Pythonis also used for building tools for online games. Some game engines might use Python as a scripting language.

Pythonis the server side programming language .We can use Python with framework to develop mobile applications where you can manage database entries and other operations. One of the most popular frameworks for Python mobile app development is Kivy.

Python can be used to develop of APIs of mobile applications. The mobile app developers can create apps with python as it can run on several major operating systems.

In addition to this, the increase in the number of mobile phone users and the increase in demand for applications led to the use of this programming language to develop mobile applications. In recent years, Python has evolved to become important in the app development.
Python can be used in a wide array of mobile application areas. Easy to understand, interact and easy to implement, Python programming language is a language that allows you to code the same program with much fewer lines than any other languages.

Installing Python

Follow these step by step instructions in the given video to download and install python.

Who uses python?

In python, we have two versions python 2 and python 3

Let’s learn the difference between python 2 and python 3

Basis of comparison
Python 2
Python 3
Print function is treated as a statement
Print function is treated as a function
Division of integers
A number without fractional component for e.g. 3/2=1
Precise and accurate with fractional component for e.g. 3/2=1.5
Size of integer
32 bits
Handling exception
Exception nameerror,err
Exception nameerror as err
String type
Xrange function
Leak of for loop variables in global namespace
Never change
Changes inside for loop
Python 3 is known for its simpler syntax

Now we can go deeper into the comparison between both with an example

Basis of Comparison with e.g.
Python 2
Python 3
1. Python 2.7.14 (v2.7.14:84471935ed, Oct 20 2019, 12:01:12)
3. >>> print 'hello’, ‘there’
4. Hello there

1. Python 3.6.4 |Anaconda, Inc.| (default,Oct 20 2019 12:01:15)
3. >>> print('Hello’, ‘there’)
Hello there
Division of integers
>>> 3 / 2
>>> 3 / 2.0 # of course it "works" if one or both are float

>>> 3 / 2

1. >>> range(1, 10)
2. [1, 2, 3, 4, 5, 6, 7, 8, 9]
3. >>> xrange(1, 10)
4. xrange(1, 10)

>>> range(1, 10)
range(1, 10)
>>> list(range(1, 10))
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Above were the few examples to know the basic difference between both

We can learn a lot more with this video

Why to choose Python 3 over Python 2

Python 3 is the latest choice as industries now are working on python 3 and many are migrating from python 2 to python 3. Python 3 is secure, faster more efficient easy and enhanced as compared to older version.

Python features

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