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  • Book Overview & Buying Mastering Python Design Patterns
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Mastering Python Design Patterns

Mastering Python Design Patterns

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

Mastering Python Design Patterns

3.6 (5)
By: Sakis Kasampalis
Buy this Book

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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Preface
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Design patterns
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Common misunderstandings about design patterns
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Design patterns and Python
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. The Factory Pattern
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1. The Factory Pattern
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Factory Method
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Abstract Factory
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Summary
2
2. The Builder Pattern
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2. The Builder Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
3
3. The Prototype Pattern
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3. The Prototype Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
4
4. The Adapter Pattern
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4. The Adapter Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
5
5. The Decorator Pattern
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5. The Decorator Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
6
6. The Facade Pattern
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6. The Facade Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
7
7. The Flyweight Pattern
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7. The Flyweight Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
8
8. The Model-View-Controller Pattern
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8. The Model-View-Controller Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
9
9. The Proxy Pattern
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9. The Proxy Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
10
10. The Chain of Responsibility Pattern
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10. The Chain of Responsibility Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
11
11. The Command Pattern
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11. The Command Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
12
12. The Interpreter Pattern
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12. The Interpreter Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
13
13. The Observer Pattern
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13. The Observer Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
14
14. The State Pattern
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14. The State Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
15
15. The Strategy Pattern
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15. The Strategy Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
16
16. The Template Pattern
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16. The Template Pattern
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A real-life example
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A software example
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Use cases
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Implementation
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Summary
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Index
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Index

Implementation

There are many ways to implement Chain of Responsibility in Python, but my favorite implementation is the one by Vespe Savikko [j.mp/savviko]. Vespe's implementation uses dynamic dispatching in a Pythonic style to handle requests [j.mp/ddispatch].

Let's implement a simple event-based system using Vespe's implementation as a guide. The following is the UML class diagram of the system:

The Event class describes an event. We'll keep it simple, so in our case an event has only name:

class Event: 
    def __init__(self, name): 
        self.name = name 

    def __str__(self): 
        return self.name

The Widget class is the core class of the application. The parent aggregation shown in the UML diagram indicates that each widget can have a reference to a parent object, which by convention, we assume is a Widget instance. Note, however, that according to the rules of inheritance, an instance of any of the subclasses of Widget (for example, an instance of MsgText) is also an instance...

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Programming languages
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Mastering Python Design Patterns
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