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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Essential type hints for class definitions

A class name is also a type hint, allowing a direct reference between a variable and the class that should define the objects associated with the variable. This relationship lets tools such as mypy reason about our programs to be sure that object references and method references appear to match the type hints in our code.

We'll use type hints in three common places in a class definition:

  • In method definitions, we'll use type hints to annotate the parameters and the return type.
  • In the __init__() method, we may need to provide hints for the instance variables that define the state of the object.
  • Any attributes of the class overall. These are not common and type hints are rare here.

Getting ready

We're going to examine a class with a variety of type hints. In this example, our class will model a handful of dice. We'll allow rerolling selected dice, making the instance of the class...