Blueprint URL prefixes in Flask - Mini Project: Build & Apply

Blueprint URL prefixes in Flask

📖 Scenario: You are building a small web app with two sections: one for users and one for products. Each section should have its own URL prefix to keep things organized.

🎯 Goal: Create two Flask blueprints named users_bp and products_bp. Register them in the main app with URL prefixes /users and /products respectively. Each blueprint should have one route that returns a simple message.

📋 What You'll Learn

Create a Flask app instance named app

Create a blueprint named users_bp with a route /profile that returns 'User Profile'

Create a blueprint named products_bp with a route /list that returns 'Product List'

Register users_bp with the URL prefix /users

Register products_bp with the URL prefix /products

💡 Why This Matters

🌍 Real World

Blueprints help organize large Flask apps by grouping related routes under URL prefixes, making the app easier to maintain.

💼 Career

Understanding blueprints and URL prefixes is essential for backend web developers working with Flask to build scalable web applications.

1

Create Flask app and users blueprint

Create a Flask app instance called app. Then create a blueprint called users_bp with the name 'users' and import name __name__. Add a route /profile to users_bp that returns the string 'User Profile'.

Flask

from flask import Flask, Blueprint

# Create Flask app instance

# Create users_bp blueprint

# Add /profile route to users_bp
# Your code here

Need a hint?

Use Flask(__name__) to create the app. Use Blueprint('users', __name__) to create the users blueprint. Define a function profile decorated with @users_bp.route('/profile') that returns 'User Profile'.

2

Create products blueprint with list route

Create a blueprint called products_bp with the name 'products' and import name __name__. Add a route /list to products_bp that returns the string 'Product List'.

Flask

from flask import Flask, Blueprint

app = Flask(__name__)

users_bp = Blueprint('users', __name__)

@users_bp.route('/profile')
def profile():
    return 'User Profile'

# Create products_bp blueprint

# Add /list route to products_bp
# Your code here

Need a hint?

Create the products blueprint like the users one. Add a route /list that returns 'Product List'.

3

Register users blueprint with URL prefix

Register the users_bp blueprint with the Flask app app using the URL prefix /users.

Flask

from flask import Flask, Blueprint

app = Flask(__name__)

users_bp = Blueprint('users', __name__)

@users_bp.route('/profile')
def profile():
    return 'User Profile'

products_bp = Blueprint('products', __name__)

@products_bp.route('/list')
def product_list():
    return 'Product List'

# Register users_bp with URL prefix '/users'
# Your code here

Need a hint?

Use app.register_blueprint(users_bp, url_prefix='/users') to register the users blueprint with the prefix.

4

Register products blueprint with URL prefix

Register the products_bp blueprint with the Flask app app using the URL prefix /products.

Flask

from flask import Flask, Blueprint

app = Flask(__name__)

users_bp = Blueprint('users', __name__)

@users_bp.route('/profile')
def profile():
    return 'User Profile'

products_bp = Blueprint('products', __name__)

@products_bp.route('/list')
def product_list():
    return 'Product List'

app.register_blueprint(users_bp, url_prefix='/users')

# Register products_bp with URL prefix '/products'
# Your code here

Need a hint?

Use app.register_blueprint(products_bp, url_prefix='/products') to register the products blueprint with the prefix.