Book Image

Modern Python Cookbook - Second Edition

By : Steven F. Lott
Book Image

Modern Python Cookbook - Second Edition

By: Steven F. Lott

Overview of this book

Python is the preferred choice of developers, engineers, data scientists, and hobbyists everywhere. It is a great language that can power your applications and provide great speed, safety, and scalability. It can be used for simple scripting or sophisticated web applications. By exposing Python as a series of simple recipes, this book gives you insight into specific language features in a particular context. Having a tangible context helps make the language or a given standard library feature easier to understand. This book comes with 133 recipes on the latest version of Python 3.8. The recipes will benefit everyone, from beginners just starting out with Python to experts. You'll not only learn Python programming concepts but also how to build complex applications. The recipes will touch upon all necessary Python concepts related to data structures, object oriented programming, functional programming, and statistical programming. You will get acquainted with the nuances of Python syntax and how to effectively take advantage of it. By the end of this Python book, you will be equipped with knowledge of testing, web services, configuration, and application integration tips and tricks. You will be armed with the knowledge of how to create applications with flexible logging, powerful configuration, command-line options, automated unit tests, and good documentation.
Table of Contents (18 chapters)
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Choosing between inheritance and composition – the "is-a" question

In the Using cmd for creating command-line applications recipe in Chapter 6, User Inputs and Outputs, and the Extending a collection – a list that does statistics recipe in Chapter 7, Basics of Classes and Objects, we looked at extending a class. In both cases, the class implemented in the recipe was a subclass of one of Python's built-in classes. In Chapter 7, Basics of Classes and Objects, we defined the DiceCLI class to extend the cmd.Cmd class via inheritance. In We also defined a StatsList class to extend the built-in list class.

The idea of extension via inheritance is sometimes called the generalization-specialization relationship. It's sometimes also called an is-a relationship.

There's an important semantic issue here: it's sometimes referred to as the wrap versus extend problem. There are two common choices:

  • Do we mean that instances of the subclass...