Build state-of-the-art web applications quickly and efficiently using Flask and related technologies with Python 3
Key Features
• Updated to Flask 1.0.3 and Python 3.7 with coverage of Microservices
• Get the most out of the powerful Flask framework and maintain the flexibility of your design choices
• Write cleaner and maintainable code with the help of sample apps
Book Description
Flask, the lightweight Python web framework, is popular due to its powerful modular design that lets you build scalable web apps. With this recipe-based guide, you'll explore modern solutions and best practices for Flask web development.
Updated to the latest version of Flask and Python 3, this second edition of Flask Framework Cookbook moves away from some of the old and obsolete libraries and introduces recipes on bleeding edge technologies. You'll discover different ways of using Flask to create, deploy, and manage microservices. This Flask Python book starts by covering the different configurations that a Flask application can make use of, and then helps you work with templates and learn about the ORM and view layers. You'll also be able to write an admin interface and get to grips with debugging and logging errors. Finally, you'll grasp a variety of deployment and post-deployment techniques for platforms such as Apache, Tornado, and Heroku.
By the end of this book, you'll have gained all the knowledge you need to write Flask applications in the best possible way and scale them using standard industry practices.
What you will learn
• Explore web application development in Flask, right from installation to post-deployment stages
• Make use of advanced templating and data modeling techniques
• Discover effective debugging, logging, and error handling techniques in Flask
• Integrate Flask with different technologies such as Redis, Sentry, and MongoDB
• Deploy and package Flask applications with Docker and Kubernetes
• Design scalable microservice architecture using AWS LambdaContinuous integration and Continuous deployment
Who this book is for
If you are a web developer who wants to learn more about developing scalable and production-ready applications in Flask, this is the book for you. You'll also find this book useful if you are already aware of Flask's major extensions and want to use them for better application development. Basic Python programming experience along with basic understanding of Flask is assumed.
Author(s): Shalabh Aggarwal
Edition: 2
Publisher: Packt Publishing
Year: 2019
Language: English
Commentary: Vector PDF
Pages: 290
City: Birmingham, UK
Tags: Debugging; Python; Web Applications; NoSQL; MongoDB; Cookbook; Logging; Microservices; Docker; Deployment; Redis; Profiling; Flask; Kubernetes; SQLAlchemy; Data Modeling; Containerization; Zappa; Error Handling; Heroku; Testing; AWS Lambda; Tornado; AWS Elastic Beanstalk; AWS Simple Storage Service; Apache Web Server; Email; Jinja; WTForms; RESTful API; Sentry; New Relic
Cover
Title Page
Copyright and Credits
About Packt
Contributors
Table of Contents
Preface
Chapter 1: Flask Configurations
Setting up our environment with virtualenv
How to do it...
How it works...
There's more...
See also
Handling basic configurations
Getting ready
How to do it...
How it works...
Configuring using class-based settings
How to do it...
How it works...
Organizing static files
How to do it...
How it works...
There's more...
Being deployment-specific with instance folders
How to do it...
How it works...
Composition of views and models
How to do it...
How it works...
See also
Creating a modular web app with blueprints
Getting ready
How to do it...
How it works...
See also
Making a Flask app installable using setuptools
How to do it...
How it works...
See also
Chapter 2: Templating with Jinja2
Bootstrapping the recommended layout
Getting ready
How to do it...
How it works...
Implementing block composition and layout inheritance
Getting ready
How to do it...
How it works...
Creating a custom context processor
How to do it...
Creating a custom Jinja2 filter
How to do it...
How it works...
See also
Creating a custom macro for forms
Getting ready
How to do it...
Advanced date and time formatting
Getting ready
How to do it...
See more
Chapter 3: Data Modeling in Flask
Creating an SQLAlchemy DB instance
Getting ready
How to do it...
There's more...
See also
Creating a basic product model
How to do it...
How it works...
See also
Creating a relational category model
How to do it...
See also
Migrating databases using Alembic and Flask-Migrate
Getting ready
How to do it...
How it works...
See also
Indexing model data with Redis
Getting ready
How to do it...
How it works...
Opting for the NoSQL way with MongoDB
Getting ready
How to do it...
See also
Chapter 4: Working with Views
Writing function-based views and URL routes
Getting ready
How to do it...
A simple GET request
A simple POST request
A simple GET/POST request
How it works...
There's more...
Writing class-based views
Getting ready
How to do it...
How it works...
There's more...
See also
Implementing URL routing and product-based pagination
Getting ready
How to do it...
Adding pagination to applications
See also
Rendering to templates
Getting ready
How to do it...
How it works...
See also
Dealing with XHR requests
Getting ready
How to do it...
How it works...
Using decorators to handle requests beautifully
Getting ready
How to do it...
See also
Creating custom 404 and 500 handlers
Getting ready
How to do it...
How it works...
There's more...
Flashing messages for better user feedback
Getting ready
How to do it...
How it works...
Implementing SQL-based searching
Getting ready
How to do it...
How it works...
Chapter 5: Webforms with WTForms
Representing SQLAlchemy model data as a form
Getting ready
How to do it...
How it works...
See also
Validating fields on the server side
How to do it...
How it works...
There's more...
See also
Creating a common forms set
How to do it...
How it works...
Creating custom fields and validation
How to do it...
How it works...
There's more...
Creating a custom widget
How to do it...
How it works...
See also
Uploading files via forms
How to do it...
How it works...
Protecting applications from cross-site request forgery (CSRF)
How to do it...
How it works...
Chapter 6: Authenticating in Flask
Creating a simple session-based authentication
Getting ready
How to do it...
How it works...
See also
Authenticating using the Flask-Login extension
Getting ready
How to do it...
How it works...
There's more...
See also
Using Facebook for authentication
Getting started
How to do it...
How it works...
Using Google for authentication
Getting ready
How to do it...
How it works...
Using Twitter for authentication
Getting ready
How to do it...
How it works...
Authenticating with LDAP
Getting ready
How to do it...
How it works...
See also
Chapter 7: RESTful API Building
Creating a class-based REST interface
Getting ready
How to do it...
How it works...
Creating an extension-based REST interface
Getting ready
How to do it...
How it works...
See also
Creating a complete RESTful API
Getting ready
How to do it...
How it works...
Chapter 8: Admin Interface for Flask Apps
Creating a simple CRUD interface
Getting ready
How to do it...
How it works...
Using the Flask-Admin extension
Getting ready
How to do it...
How it works...
There's more...
Registering models with Flask-Admin
Getting ready
How to do it...
How it works...
Creating custom forms and actions
Getting ready
How to do it...
How it works...
Using a WYSIWYG editor for textarea integration
Getting ready
How to do it...
How it works...
See also
Creating user roles
Getting ready
How to do it...
How it works...
Chapter 9: Internationalization and Localization
Adding a new language
Getting ready
How to do it...
How it works...
There's more...
See also
Implementing lazy evaluation and the gettext/ngettext functions
Getting ready
How to do it...
Implementing the global language switching action
Getting ready
How to do it...
How it works...
See also
Chapter 10: Debugging, Error Handling, and Testing
Setting up basic file logging
Getting ready
How to do it...
How it works...
There's more...
See also
Sending emails on the occurrence of errors
Getting ready
How to do it...
How it works...
There's more...
Using Sentry to monitor exceptions
Getting ready
How to do it...
How it works...
Debugging with pdb
Getting ready
How to do it...
How it works...
See also
Creating our first simple test
Getting ready
How to do it...
How it works...
See also
Writing more tests for views and logic
Getting ready
How to do it...
How it works...
Nose library integration
Getting ready
How to do it...
See also
Using mocking to avoid real API access
Getting ready
How to do it...
How it works...
See also
Determining test coverage
Getting ready
How to do it...
How it works...
See also
Using profiling to find bottlenecks
Getting ready
How to do it...
How it works...
Chapter 11: Deployment and Post-Deployment
Deploying with Apache
Getting ready
How to do it...
How it works...
There's more...
See also
Deploying with uWSGI and Nginx
Getting ready
How to do it...
See also
Deploying with Gunicorn and Supervisor
Getting ready
How to do it...
How it works...
See also
Deploying with Tornado
Getting ready
How to do it...
How it works...
Using S3 storage for file uploads
Getting ready
How to do it...
How it works...
See also
Deploying with Heroku
Getting ready
How to do it...
How it works...
There's more...
Deploying with AWS Elastic Beanstalk
Getting ready
How to do it...
How it works...
Managing and monitoring application performance with New Relic
Getting ready
How to do it...
How it works...
See also
Chapter 12: Microservices and Containers
Containerization with Docker
Getting ready
How to do it...
How it works...
See also
Orchestrating containers with Kubernetes
Getting ready
How to do it...
How it works...
There's more...
See also
Going serverless with Zappa on AWS Lambda
Getting ready
How to do it...
How it works...
See also
Chapter 13: Other Tips and Tricks
Implementing full-text search with Whoosh
Getting ready
How to do it...
How it works...
See also
Implementing full-text search with Elasticsearch
Getting ready
How to do it...
How it works...
Working with signals
Getting ready
How to do it...
How it works...
See also
Using caching with your application
Getting ready
How to do it...
How it works...
There's more...
See also
Implementing email support for Flask applications
Getting ready
How to do it...
How it works...
There's more...
See also
Understanding asynchronous operations
Getting ready
How to do it...
How it works...
Working with Celery
Getting ready
How to do it...
How it works...
See also
Other Books You May Enjoy
Index
