Book Image

Learn Python in 7 Days

Book Image

Learn Python in 7 Days

Overview of this book

Python is a great language to get started in the world of programming and application development. This book will help you to take your skills to the next level having a good knowledge of the fundamentals of Python. We begin with the absolute foundation, covering the basic syntax, type variables and operators. We'll then move on to concepts like statements, arrays, operators, string processing and I/O handling. You’ll be able to learn how to operate tuples and understand the functions and methods of lists. We’ll help you develop a deep understanding of list and tuples and learn python dictionary. As you progress through the book, you’ll learn about function parameters and how to use control statements with the loop. You’ll further learn how to create modules and packages, storing of data as well as handling errors. We later dive into advanced level concepts such as Python collections and how to use class, methods, objects in python. By the end of this book, you will be able to take your skills to the next level having a good knowledge of the fundamentals of Python.
Table of Contents (18 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
2
Type Variables and Operators

Operator overloading


In this section, we will learn about operator overloading with special methods. Generally, people call them magic methods. We will use these methods in operator overloading. First, let's understand what operator overloading is. Using a special method, we'll able to change the built-in behavior of the operator. The special method is surrounded by double underscores (__). Some people called it the dunder method. Let's take an example of the + operator, as shown in the following example:

>>> "M"+"R"
'MR'
>>> 4+6
10
>>>

You can see a different behavior of the + operator. The integer number is added and the strings are concatenated. Depending upon the object you are working with, the + operator has different behavior. However, the + calling is a special method that runs in the background. In order to do addition of two integers, the + operator calls int.__add__(1,2) and for string addition + calls str.__add__(“a”, “b”). Refer to the following example...