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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')
@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 world of Flask!</p>
      </body>
</html>''' % user

if __name__ == '__main__':
    app.run()

Is the preceding pattern of writing the application feasible in the case of large applications that involve thousands of lines of HTML, JS, and CSS code? Obviously not!

Here, templating saves us because we can structure our view code by keeping our templates separate. Flask provides default support for Jinja2, although we can use any templating engine as suited. Furthermore, Jinja2 provides many additional features that make our templates very powerful and modular.