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Mastering Python Design Patterns

Mastering Python Design Patterns

By : Sakis Kasampalis
3.6 (5)
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Mastering Python Design Patterns

Mastering Python Design Patterns

3.6 (5)
By: Sakis Kasampalis

Overview of this book

This book is for Python programmers with an intermediate background and an interest in design patterns implemented in idiomatic Python. Programmers of other languages who are interested in Python can also benefit from this book, but it would be better if they first read some introductory materials that explain how things are done in Python.
Table of Contents (18 chapters)
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1
1. The Factory Pattern
17
Index

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 in 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 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 feature of Command by far is undo, it has more uses. In general, any operation that can be executed on user's will at runtime...

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