Book Image

Python Programming Blueprints

By : Daniel Furtado, Marcus Pennington
Book Image

Python Programming Blueprints

By: Daniel Furtado, Marcus Pennington

Overview of this book

Python is a very powerful, high-level, object-oriented programming language. It's known for its simplicity and huge community support. Python Programming Blueprints will help you build useful, real-world applications using Python. In this book, we will cover some of the most common tasks that Python developers face on a daily basis, including performance optimization and making web applications more secure. We will familiarize ourselves with the associated software stack and master asynchronous features in Python. We will build a weather application using command-line parsing. We will then move on to create a Spotify remote control where we'll use OAuth and the Spotify Web API. The next project will cover reactive extensions by teaching you how to cast votes on Twitter the Python way. We will also focus on web development by using the famous Django framework to create an online game store. We will then create a web-based messenger using the new Nameko microservice framework. We will cover topics like authenticating users and, storing messages in Redis. By the end of the book, you will have gained hands-on experience in coding with Python.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Dedication
Contributors
Packt Upsell
Preface
Index

Nameko Dependency Providers


When building microservices, Nameko encourages the use of dependency providers to communicate with external resources such as databases, servers, or anything that our application depends on. By using a dependency provider, you can hide away logic that is specific only to that dependency, keeping your service level code clean and agnostic to the ins-and-outs of interfacing with this external resource.

By structuring our microservices like this, we have the ability to easily swap out or re-use dependency providers in other services.

Note

Nameko provides a list of open source dependency providers that are ready to use: http://url.marcuspen.com/nam-ext.

Adding a Redis Dependency Provider

Since Redis is an external resource for our application, we will create a dependency provider for it.

Designing the Client

First, let's create a new folder named dependencies inside of our temp_messenger folder. Inside, place a new file, redis.py. We will now create a Redis client with a...