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Templating with Jinja2

This chapter will cover the basics of Jinja2 templating from the perspective of Flask; we will also learn how to make applications with modular and extensible templates.

In Flask, we can write a complete web application without the need for third-party templating engine. For example, have a look at the following code; this is a standalone, simple Hello World application with a bit of HTML styling included:

from flask import Flask 
app = Flask(__name__) 
 
@app.route('/') 
@app.route('/hello') 
@app.route('/hello/<user>') 
def hello_world(user=None): 
    user = user or 'Shalabh' 
    return ''' 
<html> 
    <head> 
      <title>Flask Framework Cookbook</title> 
 
    </head> 
      <body> 
        <h1>Hello %s!</h1> 
        <p>Welcome to the...

Key benefits

Explore Flask 1.0.3 and Python 3.7, along with useful insights into 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

Description

Flask, the lightweight Python web framework, is popular thanks 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 new recipes on cutting-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 learn 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 confidently write Flask applications and scale them using standard industry practices.

Who is this book 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.

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 Lambda continuous integration and continuous deployment

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

AI Assistant (beta) to help accelerate your learning

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Amazon verified reviews

Rajendra Sharma Sep 05, 2019

He had the most sagacious way to structure the book and very well laid out with wonderful examples.He teaches all the new concepts via an actual app that you can make along with him. What makes this especially amazing/helpful is the subject matter itself.

Amazon Verified review

Richard Jun 04, 2021

i've been using python flask and django [with bulma and bootstrap] for a good while now and until now i much preferred django as a web framework as it is very powerful and flask comes as a bare bones framework with very little out of the box.i've read the usual flask reference books and although they are comprehensive they can be verbose and it's not so easy to find the snippets that you need.this book is well organised, presented and cross referenced so that you can go to relevant sections in a flash.my motivation for choosing this book was to understand flask blueprints better as i was getting annoying circular imports. not only can i now organise my code but i have an excellent reference collection of extensions that i can use out of the box to make my apps much more functional.highly recommended

debashish Feb 21, 2021

Concise introductions to a broad range of Flask topics.

Ashish Desai Apr 12, 2020

Perfect book for folks who are used to pgrogramming and need a quick reference to solve a specific scenario. Covers most use cases any developer will encounter during 90% of their dev time

Alex Sep 11, 2023

It's a great book and I used it to create several services, but I just wish I had not started with Flask but used Django instead. Yes, you can get a webserver running with five lines of code and you can build everything using Flask and SqlAlchemy and you can also build a house only using a screwdriver and enough determination.But if you want to build a serious web application and need a lot of features, just do yourself a favour, stop here and start learning Django.

Flask Framework Cookbook: Over 80 proven recipes and techniques for Python web development with Flask , Second Edition

What do you get with Print?

Flask Framework Cookbook

Templating with Jinja2

Bootstrapping the recommended layout

Getting ready

How to do it...

Implementing block composition and layout inheritance

Getting ready

Creating a custom context processor

How to do it...

Creating a custom Jinja2 filter

Creating a custom macro for forms

Getting ready

How to do it...

Advanced date and time formatting

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