Copy of Introduction to Python.

Welcome to the World of Python – The Most Powerful and Popular
Programming Langauge
Are you ready to be a Python Pro – Learn the Essentials of the Python
Programming Language. Our Python introduction guide is your secret weapon
to success. Not only will you learn the basics of Python syntax, but you’ll also
gain a deep understanding of the language and be able to easily create your
own programs.
Here is a quick overview of what you are going to learn today in this Python
Introduction-
● What is Python
● Python History
● Features of Python
● Applications of Python
● Architecture and Working of Python
● Python Constructs
What is Python?
Python is a General Purpose object-oriented programming language, which
means that it can model real-world entities. It is also dynamically-typed
because it carries out type-checking at runtime.
It does so to make sure that the type of construct matches what we expect it to
be.
The distinctive feature of Python is that it is an interpreted language.

The Python IDLE (Integrated Development Environment) executes
instructions one line at a time. This also lets us use it as a calculator.
Why is it called Python?
Guido van Rossum named it after the comedy group Monty Python. That is
why the metasyntactic variables (those we will often use to explain code
syntax) used here are ‘spam’ and ‘eggs’ instead of ‘foo’ and ‘bar’.

History of Python
● Python was conceived in the late 1980s and was named after the
BBC TV show Monty Python’s Flying Circus.

● Guido van Rossum started implementing Python at CWI in the
Netherlands in December of 1989.
● This was a successor to the ABC programming language which was
capable of exception handling and interfacing with the Amoeba
operating system.
● On October 16 of 2000, Python 2.0 released with many new
features.
● Then Python 3.0 was released on December 3, 2008.
Why Learn Python?
Python is the “most powerful language you can still read”, Says Paul Dubois
Python is one of the richest Programming languages.
Going by the TIOBE Index, Python is the Most Popular Programming
Language in the world.
This makes a career in Python a great choice.
Python Features
Let us now see various features of Python that make it so powerful and
popular:

a. Easy
Python is very easy to learn and understand; any beginner can learn Python
easily. When writing code in Python, you need fewer lines of code compared to
languages like Java.

b. Interpreted
It is interpreted(executed) line by line. This makes it easy to test and debug.
c. Object-Oriented
The Python programming language supports classes and objects and hence it
is object-oriented.
d. Free and Open Source
The language and its source code are available to the public for free; there is
no need to buy a costly license.
e. Portable
Since Python is open-source, you can run it on Windows, Mac, Linux or any
other platform. Your programs will work without any need to change it for
every machine.
f. GUI Programming
You can use it to develop a GUI (Graphical User Interface). One way to do this
is through Tkinter.
g. Large Python Library
Python provides you with a large standard library.
You can use it to implement a variety of functions without the need to reinvent
the wheel every time. Just pick the code you need and continue.

In this Python introduction, we have provided a short description. You must
read them in detail at Python Programming Features
Applications of Python
Python is easy to pick-up even if you come from a non-programming
background. You can look at the code and tell what’s going on.
Talking of Python applications, some of the cool things that you can do are –
● Build a website using Python
● Develop a game in Python
● Perform Computer Vision (Facilities like face-detection and
color-detection)
● Implement Machine Learning (Give a computer the ability to learn)
● Enable Robotics with Python
● Perform Web Scraping (Harvest data from websites)
● Perform Data Analysis using Python
● Automate a web browser
● Perform Scripting in Python
● Perform Scientific Computing using Python
● Build Artificial Intelligence
Python isn’t limited to these applications. If you’ve ever used services from
brands like YouTube, Dropbox, and Netflix, then you’ve been a consumer of
Python.
The search-engine Google also made great use of this language in its initial
stages.
Python Architecture and Working

Let’s now talk about Python architecture and its usual flow –

a. Parser
It uses the source code to generate an abstract syntax tree.
b. Compiler
It turns the abstract syntax tree into Python bytecode.
c. Interpreter
It executes the code line by line in a REPL (Read-Evaluate-Print-Loop)
fashion.
Python Constructs
a. Functions in Python
A function in Python is a collection of statements grouped under a name. You
can use it whenever you want to execute all those statements at a time.
You can call it wherever you want and as many times as you want in a
program. A function may return a value.
b. Classes in Python
As we discussed earlier, Python is an object-oriented language. It supports
classes and objects.
A class is an abstract data type. In other words, it is a blueprint for an object of
a certain kind. It holds no values.

An object is a real-world entity and an instance of a class.
c. Modules in Python
Python module is a collection of related classes and functions.
We have modules for mathematical calculations, string manipulations, web
programming, and many more.
d. Packages in Python
Python package is a collection of related modules. You can either import a
package or create your own.
Python has a lot of other constructs. These include control structures,
functions, exceptions, etc.
Interested in learning python in detail? Just follow the sidebar and learn
Python completely.
Python Interview Questions for Beginners
Below are some of the frequently asked Python Interview questions:
1. How does Python get its name?
2. What are the Features of Python that make it so popular?
3. Define Modules in Python?
4. What is the difference between List and Tuple in Python?
5. Compare Python with Java

Summary
This was all about Python introduction where you learnt what is python, why
python is so powerful, what are the applications of Python and basic
architecture and constructs of python.

Copy of Introduction to Python.

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