Kumar - Learn Python: A Beginners Guide to Python, Numpy,Pandas and Scipy

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Learn Python

A Beginners Guide to Python, NumPy, Pandas

and SciPy.

M R KISHORE KUMAR

For you.

One way or another this book ended up in your hands. Im excited to

see what you do with it, and I hope the knowledge within this book

makes as large an impact on your life as it has on my own.

About the Tutorial

Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Pythons elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms.

Audience

This tutorial introduces the reader informally to the basic concepts and features of the Python language and system. It helps to have a Python interpreter handy for hands-on experience, but all examples are self-contained, so the tutorial can be read off-line as well.

Prerequisites

Before proceeding with this tutorial you should have a basic working knowledge of Windows or Linux operating system, additionally, you must be familiar with:

Experience with any text editor like sublime, Visual Studio Code, or pycharm, etc.

How to create directories and files on your computer.

How to navigate through different directories.

How to type content in a file and save them on a computer.

Copyright 2021 by M R KISHORE KUMAR

All rights reserved. This book or any portion thereof May not be reproduced or used in any manner whatsoever Without the express written permission of the publisher Except for the use of brief quotations in a book review.

Printed in India.

First Printing, 2021

www.mrkishorekumar.com

Table of Content

1.Python Introduction...6

2.Python Getting Started...9

3.Python Syntax...11

4.Python Comments...12

5.Python Variables...14

6.Python Operators...19

7.Python Data Types...23

8.Python Numbers...26

9.Python Strings...29

10.Python Casting...42

11.Python Booleans...43

12.Python Lists...47

13.Python Tuples...68

14.Python range() Function80

15.Python Sets...82

16.Python frozenset() Function92

17.Python Dictionaries93

18.Python math Module106

19.Python User Input...110

20.Python eval() Function111

21.Python If ... Else...112

22.Python While Loops.117

23.Python For Loops...119

24.Python Arrays...124

25.Python Functions.127

26.Python Lambda...134

27.Python Classes and Objects..136

28.Python Inheritance.140

29.Python Iterators...144

30.Python Scope...148

31.Python Modules...154

32.Python Datetime...158

33.Python Math...162

34.Python JSON...164

35.Python RegEx...169

36.Python PIP...177

37.Python Try Except...180

38.Python String Formatting183

39.Python File Handling185

40.NumPy Tutorial ...191

41.Pandas Tutorial ...283

42.SciPy Tutorial ...312

01.Python Introduction

What is Python?

Python is a popular programming language. It was created by Guido van Rossum, and released in 1991.

It is used for:

web development (server-side),

software development,

mathematics,

system scripting.

What can Python do?

Python can be used on a server to create web applications.

Python can be used alongside software to create workflows.

Python can connect to database systems. It can also read and modify files.

Python can be used to handle big data and perform complex mathematics.

Python can be used for rapid prototyping, or for production-ready software development.

Why Python?

Python works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc).

Python has a simple syntax similar to the English language.

Python has a syntax that allows developers to write programs with fewer lines than some other programming languages.

Python runs on an interpreter system, meaning that code can be executed as soon as it is written. This means that prototyping can be very quick.

Python can be treated in a procedural way, an object-oriented way, or a functional way.

Good to know

The most recent major version of Python is Python 3, which we shall be using in this tutorial. However, Python 2, although not being updated with anything other than security updates, is still quite popular.

In this tutorial, Python will be written in a text editor. It is possible to write Python in an Integrated Development Environment, such as Thonny, Pycharm, Netbeans, or Eclipse which are particularly useful when managing larger collections of Python files.

Python Syntax compared to other programming languages

Python was designed for readability and has some similarities to the English language with influence from mathematics.

Python uses new lines to complete a command, as opposed to other programming languages which often use semicolons or parentheses.

Python relies on indentation, using whitespace, to define scope; such as the scope of loops, functions, and classes. Other programming languages often use curly brackets for this purpose.

Example

print ( "Hello, World!" )

Definition and Usage

The print() function prints the specified message to the screen or another standard output device.

The message can be a string or any other object, the object will be converted into a string before written to the screen.

Syntax

print (object(s) , sep= separator , end= end , file= file , flush= flush )

Parameter Values

Parameter	Description
object(s)	Any object, and as many as you like. Will be converted to a string before printed
sep=' separator '	Optional. Specify how to separate the objects, if there is more than one. Default is ' '
end=' end '	Optional. Specify what to print at the end. Default is '\n' (line feed)
file	Optional. An object with a write method. Default is sys.stdout
flush	Optional. A Boolean, specifying if the output is flushed (True) or buffered (False). Default is False

02.Python Getting Started

Python Install

Many PCs and Macs will have python already installed.

To check if you have python installed on a Windows PC, search in the start bar for Python or run the following on the Command Line (cmd.exe):

C:\Users\ Your Name >python --version

To check if you have python installed on a Linux or Mac, then on Linux open the command line or on Mac open the Terminal, and type:

python --version

If you find that you do not have python installed on your computer, then you can download it for free from the following website: https://www.python.org/

Python Quickstart

Python is an interpreted programming language, this means that as a developer you write Python (.py) files in a text editor and then put those files into the python interpreter to be executed.

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