Python Falcon – App Class Examples

Below are the examples of Python Falcon – App Class:

Create App Class for User Details

In this example, below Python code uses Falcon framework to create two resources for handling user-related requests: UserResource for fetching a list of users and UserProfileResource for retrieving individual user profiles based on their ID. The /users endpoint responds with a list of user data, while /users/{user_id} returns the profile information of a specific user.

Python3

import falcon

class UserResource:
    def on_get(self, req, resp):
        # Logic to fetch and return user data from database
        resp.media = {
            'users': [{'id': 1, 'name': 'Alice'}, {'id': 2, 'name': 'Bob'}]}

class UserProfileResource:
    def on_get(self, req, resp, user_id):
        # Logic to fetch and return user profile data based on user_id
        resp.media = {'user_id': user_id, 'profile': {
            'email': 'alice@example.com', 'age': 30}}

app = falcon.App()
app.add_route('/users', UserResource())
app.add_route('/users/{user_id}', UserProfileResource())

if __name__ == '__main__':
    from wsgiref import simple_server
    httpd = simple_server.make_server('localhost', 8000, app)
    print('Serving on localhost:8000...')
    httpd.serve_forever()

Output

localhost:8000/users

Create App Class for Products

In this example, below Python code sets up a Falcon application to manage product data. It includes two resources: ProductResource for the product catalog and ProductDetailResource for specific product details. The /products endpoint lists products with IDs, names, and prices, while /products/{product_id} provides detailed info.

Python

import falcon

class ProductResource:
    def on_get(self, req, resp):
        # Logic to fetch and return product catalog data from database
        resp.media = {'products': [{'id': 1, 'name': 'Product A', 'price': 20.99},
                                   {'id': 2, 'name': 'Product B', 'price': 15.49}]}

class ProductDetailResource:
    def on_get(self, req, resp, product_id):
        # Logic to fetch and return product details based on product_id
        resp.media = {'product_id': product_id, 'name': 'Product A', 'price': 20.99, 'description': 'Lorem ipsum'}

app = falcon.App()
app.add_route('/products', ProductResource())
app.add_route('/products/{product_id}', ProductDetailResource())

if __name__ == '__main__':
    from wsgiref import simple_server
    httpd = simple_server.make_server('localhost', 8000, app)
    print('Serving on localhost:8000...')
    httpd.serve_forever()

Output

localhost:8000/products

localhost:8000/products/1