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

Creating the command line parser


I have to confess one thing: I'm a command-line type of guy. Yes, I know it is considered by some people as outdated, but I love doing work on the terminal. I am definitely more productive and if you are using Linux or macOS, you can combine tools to get the results that you want. That's the reason that we are going to add a command line parser for this project.

There are some things we need to implement in order to start creating the command line parser. One functionality that we are going to add is the possibility of setting a default currency, which will avoid user of our application always having to specify the base currency to perform currency conversions.

To do that, we are going to create an action, We have seen how actions work in Chapter 1, Implementing the Weather Application, but just to refresh our minds, actions are classes that can be bound to command line arguments to execute a certain task. These actions are called automatically when the argument...