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...
