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Mastering Python Design Patterns

You're reading from   Mastering Python Design Patterns A guide to creating smart, efficient, and reusable software

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Product type Paperback
Published in Aug 2018
Publisher
ISBN-13 9781788837484
Length 248 pages
Edition 2nd Edition
Languages
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Authors (2):
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Sakis Kasampalis Sakis Kasampalis
Author Profile Icon Sakis Kasampalis
Sakis Kasampalis
Kamon Ayeva Kamon Ayeva
Author Profile Icon Kamon Ayeva
Kamon Ayeva
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Toc

Table of Contents (17) Chapters Close

Preface 1. The Factory Pattern FREE CHAPTER 2. The Builder Pattern 3. Other Creational Patterns 4. The Adapter Pattern 5. The Decorator Pattern 6. The Bridge Pattern 7. The Facade Pattern 8. Other Structural Patterns 9. The Chain of Responsibility Pattern 10. The Command Pattern 11. The Observer Pattern 12. The State Pattern 13. Other Behavioral Patterns 14. The Observer Pattern in Reactive Programming 15. Microservices and Patterns for the Cloud 16. Other Books You May Enjoy

Summary

In this chapter, we covered the Command pattern. Using this design pattern, we can encapsulate an operation, such as copy/paste, as an object. This offers many benefits, as follows:

  • We can execute a command whenever we want, and not necessarily at creation time
  • The client code that executes a command does not need to know any details about how it is implemented
  • We can group commands and execute them in a specific order

Executing a command is like ordering at a restaurant. Each customer's order is an independent command that enters many stages and is finally executed by the cook.

Many GUI frameworks, including PyQt, use the Command pattern to model actions that can be triggered by one or more events and can be customized. However, Command is not limited to frameworks; normal applications such as git-cola also use it for the benefits it offers.

Although the most advertised...

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