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Home > Programming > Programming Language > Python Programming Blueprints
Python Programming Blueprints
Python Programming Blueprints

Python Programming Blueprints: Build nine projects by leveraging powerful frameworks such as Flask, Nameko, and Django

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Python Programming Blueprints

Creating a Remote-Control Application with Spotify

Spotify is a music streaming service that was developed in Stockholm, Sweden. The first version was released back in 2008 and today it doesn't only provide music, but video and podcasts as well. Growing rapidly from a startup in Sweden to the biggest music service in the world, Spotify has apps running on video game consoles and mobile phones, and has integration with many social networks.
The company really has changed how we consume music and has also enabled not only well-known artists but small indie artists to share their music with the world.

Luckily, Spotify is also a great platform for developers and provides a really nice and well-documented REST API where it's possible to make searches by artists, albums, song names, and also create and share playlists.

For the second application in this book, we are going...

Setting up the environment

Let's go ahead and configure our development environment. The first thing we need to do is create a new virtual environment, so we can work and install the packages that we need without interfering with the global Python installation.

Our application will be called musicterminal, so we can create a virtual environment with the same name.

To create a new virtual environment, run the following command:

$ python3 -m venv musicterminal
Make sure that you are using Python 3.6 or later, otherwise the applications in this book may not work properly.

And to activate the virtual environment, you can run the following command:

$ . musicterminal/bin/activate

Perfect! Now that we have our virtual environment set up, we can create the project's directory structure. It should have the following structure:

musicterminal
├── client
├...

Creating a Spotify app

The first thing we need to do is create a Spotify app; after that, we are going to get access keys so we can authenticate and consume the REST API.

Head over to https://beta.developer.spotify.com/dashboard/ and further down on the page you can find the Login button, and if you don't have an account, you can create a new one:

At the time of writing, Spotify started changing its developer's site and was currently in beta, so the address to log in and some screenshots may be different.

If you don't have a Spotify account, you will have to create one first. You should be able to create applications if you sign up for the free account, but I would recommend signing up for the premium account because it is a great service with a great music catalog.

When you log in to the Spotify developer website, you will see a page similar to the following:

...

The application's configuration

To make the application more flexible and easy to configure, we are going to create a configuration file. This way, we don't need to hardcode the URL and access keys; also, if we need to change these settings, changes in the source code will not be required.
We are going to create a config file in the YAML format to store information that will be used by our application to authenticate, make requests to the Spotify RESP API endpoints, and so on.

Creating a configuration file

Let's go ahead and create a file called config.yaml in the musicterminal directory with the following contents:

client_id: '<your client ID>'
client_secret: '<your client secret>...

Authenticating with Spotify's web API

Now that we have the code to load the configuration file for us, we are going to start coding the authentication part of our framework. Spotify currently supports three kinds of authentication: authorization code, client credentials, and implicitly grant. We are going to implement authorization code and client credentials in this chapter, and we will start by implementing the client credentials flow, which is the easiest to start with.

The client credentials flow has some disadvantages over the authorization code flow because the flow does not include authorization and cannot access the user's private data as well as control playback. We will implement and use this flow for now, but we will change to authorization code when we start implementing the terminal player.

First, we are going to create a file called authorization.py in...

Querying Spotify's web API

So far, we have only prepared the terrain and now things start to get a bit more interesting. In this section, we are going to create the basic functions to send requests to Spotify's Web API; more specifically, we want to be able to search for an artist, get an artist's list of albums, get a list of tracks in that album, and finally we want to send a request to actually play a given track in Spotify's client that is currently active. It can be the browser, a mobile phone, Spotify's client, or even video game consoles. So, let's dive right into it!

To start off, we are going to create a file called request_type.py in the musicterminal/pytify/core directory with the following contents:

from enum import Enum, auto


class RequestType(Enum):
    GET = auto()
    PUT = auto()

We have gone through enumerations before, so we won&apos...

Creating the player

Now that we have everything we need to authenticate and consume the Spotify Rest API, we are going to create a small terminal client where we can search for an artist, browse his/her albums, and select a track to play in the Spotify client. Note that to use the client, we will have to issue an access token from a premium account and the authentication flow we need to use here is the AUTHENTICATION_CODE.
We will also need to require from the user of our application the user-modify-playback-state scope, which will allow us to control playback. With that said, let's get right into it!

First, we need to create a new directory to keep all the client's related files in it, so go ahead and create a directory named musicterminal/client.

Our client will only have three views. In the first view, we are going to get the user input and search for an...

Summary

We have covered a lot of ground in this chapter; we started by creating an application on Spotify and learning our way around its developer's website. Then, we learned how to implement the two types of authentication flow that Spotify supports: the client credentials flow and the authorization flow.

In this chapter, we also implemented a whole module wrapper with some of the functionality available from Spotify's REST API.

Then, we implemented a simple terminal client where users can search for artists, browse the artist's albums and tracks, and finally play a song in the user's active device, which can be a computer, mobile phone, or even a video game console.

In the next chapter, we are going to create a desktop application that shows the number of votes given through Twitter hashtags.

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Key benefits

  • • Deliver scalable and high-performing applications in Python.
  • • Delve into the great ecosystem of Python frameworks and libraries through projects that you will build with this book.
  • • This comprehensive guide will help you demonstrate the power of Python by building practical projects.

Description

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.

Who is this book for?

This book is for software developers who are familiar with Python and want to gain hands-on experience with web and software development projects. A basic knowledge of Python programming is required.

What you will learn

  • Learn object-oriented and functional programming concepts while developing projects
  • The dos and don ts of storing passwords in a database
  • Develop a fully functional website using the popular Django framework
  • Use the Beautiful Soup library to perform web scrapping
  • Get started with cloud computing by building microservice and serverless applications in AWS
  • Develop scalable and cohesive microservices using the Nameko framework
  • Create service dependencies for Redis and PostgreSQL
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Table of Contents

10 Chapters
Implementing the Weather Application Chevron down icon Chevron up icon
Implementing the Weather Application
Setting up the environment
Core functionality
Getting the user's input with ArgumentParser
Creating the parser
Summary
Creating a Remote-Control Application with Spotify Chevron down icon Chevron up icon
Creating a Remote-Control Application with Spotify
Setting up the environment
Creating a Spotify app
The application's configuration
Authenticating with Spotify's web API
Querying Spotify's web API
Creating the player
Summary
Casting Votes on Twitter Chevron down icon Chevron up icon
Casting Votes on Twitter
Setting up the environment
Creating a Twitter application
Adding the configuration file
Performing authentication
Building the Twitter voting application
Summary
Exchange Rates and the Currency Conversion Tool Chevron down icon Chevron up icon
Exchange Rates and the Currency Conversion Tool
Setting up the environment
Creating the API wrapper
Adding the database helper class
Creating the command line parser
Adding the application's entry point
Testing our application
Summary
Building a Web Messenger with Microservices Chevron down icon Chevron up icon
Building a Web Messenger with Microservices
TempMessenger Goals
Requirements
What is Nameko?
Creating your first Nameko microservice
Unit-testing a Nameko microservice
Exposing HTTP entrypoints
Integration testing Nameko microservices
Storing messages
Nameko Dependency Providers
Saving messages
Retrieving all messages
Displaying messages in the web browser
Sending messages via POST requests
Expiring messages in Redis
Sorting messages
Browser polling for messages
Summary
Extending TempMessenger with a User Authentication Microservice Chevron down icon Chevron up icon
Extending TempMessenger with a User Authentication Microservice
TempMessenger goals
Requirements
Creating a Postgres dependency
Creating users
Securely storing passwords in the database
Authenticating users
Splitting out the services
Creating a Flask server
Web sessions
Prepending the email to our messages
Summary
Online Video Game Store with Django Chevron down icon Chevron up icon
Online Video Game Store with Django
Setting up the development environment
Creating a new Django project
Exploring the Django project's structure
Creating the project's main app
Installing client-side dependencies
Adding login and logout views
Creating new users
Creating the game data model
Creating the shopping cart model
Summary
Order Microservice Chevron down icon Chevron up icon
Order Microservice
Setting up the environment
Creating the service models
Creating the model's managers
Learning to test
Creating the order model serializer
Creating the views
Setting up the service URLs
Integration with the game online store
Deploying to AWS
Summary
Notification Serverless Application Chevron down icon Chevron up icon
Notification Serverless Application
Setting up the environment
Setting up the Amazon Web Services CLI
Configuring a Simple Email Service
Creating an S3 bucket
Implementing the notification service
Deploying the application with Zappa
Restricting access to the API's endpoints
Modifying the order service
Testing all the pieces together
Summary
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Customer reviews

Rating distribution
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(2 Ratings)
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1 star 0%
Fabrizio R. Apr 06, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Got the book as a present. It's very interesting and rich of nice examples that, altogether, give a really good idea about how complex and vast software development is, but also how much fun it can be. Definitely recommended for those who like to learn by doing!
Amazon Verified review Amazon
ian rust May 08, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
I have been torn on how many stars to give this book, and have changed my mind a few times. First I wanted to give it 5. Then 4... now 3.My reasons are the following:1) the projects are fantastic. There's a wide variety and you really get a taste of the different kinds of programming python is capable of. They're the kind of projects that every inexperienced programmer needs exposure to.2) The explanations are often very lazily done. You rarely get much more than a simple statement of what the code literally says. There is very little meaning or learning that takes place due to reading what is written. I made up for this by watching youtube videos on whatever topic we were coding, and then used the book as coding experience and implementation details. This worked very well for me, and I learned alot in doing so, but an author with more motivation could have done much better. I can be somewhat understanding of this because the great variety of the projects makes it difficult to explain in detail how the programs work without taking up alot of space, but he just didn't do a good job explaining even on a basic level.3) The code is buggy. It is clear the author did not bother to do basic testing of his code. The code is also overly modular in a way that does not really improve the organization or clarity of the program, but maybe that's a personal taste issue.I just smell laziness with this book, and I'm not in the mood for just handing out free stars. That being said, I would not really discourage you from purchasing it if you can overlook these things / are willing to watch youtube and debug a bit, because the variety of the projects is excellent and especially valuable to beginning programmers.
Amazon Verified review Amazon

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About the 3 authors

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Profile icon Pennington
Pennington
Marcus Pennington started his journey into computer science at Highams Park Sixth Form College where he took a Cisco CCNA course. He then went to the University of Hertfordshire, where he graduated with a degree in Computer Science with Artificial Intelligence. Since then, he has had the privilege of working with some of the best developers and learning the benefits and pitfalls of many of the software practices we use today. He has a passion for writing clean, cohesive, and beautiful code.
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Profile icon Furtado
Furtado
Daniel Furtado is a software developer with over 20 years of experience in different technologies such as Python, C, .NET, C#, and JavaScript. He started programming at the age of 13 on his ZX Spectrum. He joined the Bioinformatics Laboratory of the Human Cancer Genome Project in Brazil, where he developed web applications and tools in Perl and Python to help researchers analyze data. He has never stopped developing in Python ever since. Daniel has worked on various open source projects; the latest one is a PyTerrier web micro-framework.
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Riti
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Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela