Book Image

Python: Master the Art of Design Patterns

Book Image

Python: Master the Art of Design Patterns

Overview of this book

Python is an object-oriented scripting language that is used in everything from data science to web development. Known for its simplicity, Python increases productivity and minimizes development time. Through applying essential software engineering design patterns to Python, Python code becomes even more efficient and reusable from project to project. This learning path takes you through every traditional and advanced design pattern best applied to Python code, building your skills in writing exceptional Python. Divided into three distinct modules, you’ll go from foundational to advanced concepts by following a series of practical tutorials. Start with the bedrock of Python programming – the object-oriented paradigm. Rethink the way you work with Python as you work through the Python data structures and object-oriented techniques essential to modern Python programming. Build your confidence as you learn Python syntax, and how to use OOP principles with Python tools such as Django and Kivy. In the second module, run through the most common and most useful design patterns from a Python perspective. Progress through Singleton patterns, Factory patterns, Façade patterns and more all with detailed hands-on guidance. Enhance your professional abilities in in software architecture, design, and development. In the final module, run through the more complex and less common design patterns, discovering how to apply them to Python coding with the help of real-world examples. Get to grips with the best practices of writing Python, as well as creating systems architecture and troubleshooting issues. This Learning Path combines some of the best that Packt has to offer in one complete, curated package. It includes content from the following Packt products: ? Python 3 Object-Oriented Programming - Second Edition by Dusty Phillips ? Learning Python Design Patterns - Second Edition by Chetan Giridhar ? Mastering Python Design Patterns by Sakis Kasampalis
Table of Contents (6 chapters)
4
A. Bibliography
5
Index

Chapter 10. The State Design Pattern

In this chapter, we will cover the State design pattern. Like the Command or Template design patterns, State pattern falls under the hood of Behavioral patterns. You will be introduced to the State design pattern, and we will discuss how it is used in software application development. We will work with a sample use case, a real-world scenario, and implement this in Python v3.5.

We will briefly cover these topics in this chapter:

  • Introduction to the State design pattern
  • The State design pattern and its UML diagram
  • A real-world use case with the Python v3.5 code implementation
  • State pattern: advantages and disadvantages

At the end of this chapter, you will appreciate the application and context of the State design pattern.

Defining the State design pattern

Behavioral patterns focus on the responsibilities that an object has. They deal with the interaction among objects to achieve larger functionality. The State design pattern is a Behavioral design...