Book Image

Metaprogramming with Python

By : Sulekha AloorRavi
Book Image

Metaprogramming with Python

By: Sulekha AloorRavi

Overview of this book

Effective and reusable code makes your application development process seamless and easily maintainable. With Python, you will have access to advanced metaprogramming features that you can use to build high-performing applications. The book starts by introducing you to the need and applications of metaprogramming, before navigating the fundamentals of object-oriented programming. Next, you will learn about simple decorators, work with metaclasses, and later focus on introspection and reflection. You’ll also delve into generics and typing before defining templates for algorithms. As you progress, you will understand your code using abstract syntax trees and explore method resolution order. This Python book also shows you how to create your own dynamic objects before structuring the objects through design patterns. Finally, you will learn simple code-generation techniques along with discovering best practices and eventually building your own applications. By the end of this learning journey, you’ll have acquired the skills and confidence you need to design and build reusable high-performing applications that can solve real-world problems.
Table of Contents (21 chapters)
1
Part 1: Fundamentals – Introduction to Object-Oriented Python and Metaprogramming
4
Part 2: Deep Dive – Building Blocks of Metaprogramming I
11
Part 3: Deep Dive – Building Blocks of Metaprogramming II

Exploring behavioral design patterns

As the name suggests, behavioral design patterns deal with the behavior of objects and how they talk to each other. In this section, we will learn about the elements of the chain of responsibility, command, and strategy design patterns, which belong to the behavioral design pattern category, and understand them by applying them to ABC Megamart.

Understanding the chain of responsibility

The chain of responsibility is a design pattern where the responsibility of the actions that can be performed by objects are transferred from one object to another, similar to a chain of events or actions. To explain this further and to implement this design pattern, we need the following elements to be developed in our code:

  • Parent handler: A base class that defines a base function that specifies how a sequence of actions should be handled.
  • Child handlers: One or more subclasses that overwrite the base function from the base class to perform the...