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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

Use cases


We generally use the Observer pattern when we want to inform/update one or more objects (observers/subscribers) about a change that happened to another object (subject/publisher/observable). The number of observers as well as who the observers are may vary and can be changed dynamically (at runtime).

We can think of many cases where Observer can be useful. One such case was already mentioned at the start of this chapter: news feeds. Whether it is RSS, Atom, or another format, the idea is the same; you follow a feed, and every time it is updated, you receive a notification about the update [Zlobin13, page 60].

The same concept exists in social networking. If you are connected to another person using a social networking service, and your connection updates something, you are notified about it. It doesn't matter if the connection is a Twitter user that you follow, a real friend on Facebook, or a business colleague on LinkedIn.

Event-driven systems are another example where Observer can...

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