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Simplifying with Blueprints

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Following PEP 20 which states that “Simple is better than complex”, we will be simplifying our code by using blueprints. Blueprints are a way to organize a group of related views and other code. They are registered with the application and can be used to create a modular application.

  • app.py

This gets turned into a tree structure like this:

  • app.py
  • blog.py
  • …

Creating a Blueprint

To create a blueprint, we need to create a new file called blog.py. We will then create a blueprint object and define the routes for the blog.

from flask import Blueprint


bp = Blueprint('blog', __name__)


@bp.route('/')
def index():
    return 'Blog Index'


@bp.route('/post/<int:id>')
def post(id: int):
    return f'Post {id}'

We then need to register the blueprint with the application in app.py.

from flask import Flask


app = Flask(__name__)


from blog import bp as blog_bp
app.register_blueprint(blog_bp)