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 creational design patterns

Creational design patterns are various methods to add abstraction in the process of object creation. In this section, we will be looking at three such design patterns, namely the factory method, prototype pattern, and singleton pattern.

Understanding the factory method

The factory design pattern is a method of abstraction where a factory class is created to create an object for the class from the factory class instead of directly instantiating the object. To explain this further and to implement this design pattern, our code needs the following elements:

  • Abstract class: The abstract class with the abstract methods for functionalities to be defined in the subclasses.
  • Abstraction subclasses: The subclasses are inherited from the abstract class and overwrite the abstract methods.
  • Factory class: The class to create objects for the abstraction subclasses.
  • End user method: The class or method to test or call the factory method...