Chapter 2. 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 this chapter, we will cover the following recipes:

  • Bootstrap layout
  • Block composition and layout inheritance
  • Creating a custom context processor
  • Creating a custom Jinja2 filter
  • Creating a custom macro for forms
  • Advanced date and time formatting

Introduction

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

from flask import Flask app = Flask(__name__) @app.route('/') @app.route('/hello') ...

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