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Learning Flask Framework

Learning Flask Framework

4.5 (2)
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Learning Flask Framework

Learning Flask Framework

4.5 (2)

Overview of this book

Flask is a small and powerful web development framework for Python. It does not presume or force a developer to use a particular tool or library. Flask supports extensions that can add application features as if they were implemented in Flask itself. Flask’s main task is to build web applications quickly and with less code. With its lightweight and efficient web development framework, Flask combines rapid development and clean, simple design. This book will take you through the basics of learning how to apply your knowledge of Python to the web. Starting with the creation of a “Hello world” Flask app, you will be introduced to the most common Flask APIs and Flask’s interactive debugger. You will learn how to store and retrieve blog posts from a relational database using an ORM and also to map URLs to views. Furthermore, you will walk through template blocks, inheritance, file uploads, and static assets. You will learn to authenticate users, build log in/log out functionality, and add an administrative dashboard for the blog. Moving on, you will discover how to make Ajax requests from the template and see how the Mock library can simplify testing complex interactions. Finally, you will learn to deploy Flask applications securely and in an automated, repeatable manner, and explore some of the most popular Flask resources on the web.
Table of Contents (12 chapters)
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11
Index

Introducing Jinja2


Jinja2 is a fast, flexible, and secure templating engine. It allows you to define your website in small blocks that are pieced together to form complete pages. On our blog, for instance, we will have blocks for the header, the sidebar, the footer, as well as templates, for rendering blog posts. This approach is DRY (Don't Repeat Yourself), which means that the markup contained in each block should not be copied or pasted elsewhere. Since the HTML for each part of the site exists in only one place, making changes and fixing bugs is much easier. Jinja2 also allows you to embed display logic in the template. For instance, we may wish to display a log out button to users who are logged in, but display a log in form to users browsing anonymously. As you will see, it is very easy to accomplish these types of things with a bit of template logic.

From the beginning, Flask was built with Jinja2 in mind, so working with templates in your Flask app is extremely easy. Since Jinja2...

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