Book Image

Expert Python Programming - Fourth Edition

By : Michał Jaworski, Tarek Ziadé
Book Image

Expert Python Programming - Fourth Edition

By: Michał Jaworski, Tarek Ziadé

Overview of this book

This new edition of Expert Python Programming provides you with a thorough understanding of the process of building and maintaining Python apps. Complete with best practices, useful tools, and standards implemented by professional Python developers, this fourth edition has been extensively updated. Throughout this book, you’ll get acquainted with the latest Python improvements, syntax elements, and interesting tools to boost your development efficiency. The initial few chapters will allow experienced programmers coming from different languages to transition to the Python ecosystem. You will explore common software design patterns and various programming methodologies, such as event-driven programming, concurrency, and metaprogramming. You will also go through complex code examples and try to solve meaningful problems by bridging Python with C and C++, writing extensions that benefit from the strengths of multiple languages. Finally, you will understand the complete lifetime of any application after it goes live, including packaging and testing automation. By the end of this book, you will have gained actionable Python programming insights that will help you effectively solve challenging problems.
Table of Contents (16 chapters)
14
Other Books You May Enjoy
15
Index

Data classes

As we learned from the Class instance initialization section, the canonical way to declare class instance attributes is through assigning them in the __init__() method as in the following example:

class Vector:
    def __init__(self, x, y):
        self.x = x
        self.y = y

Let's assume we are building a program that does some geometric computation and Vector is a class that allows us to hold information about two-dimensional vectors. We will display the data of the vectors on the screen and perform common mathematical operations, such as addition, subtraction, and equality comparison. We already know that we can use special methods and operator overloading to achieve that goal in a convenient way. We can implement our Vector class as follows:

class Vector:
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def __add__(self, other):
        """Add two vectors using + operator"""
        return...