Application factory pattern in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class correctly.

Flask

from flask import [1]

def create_app():
    app = [1](__name__)
    return app

Drag options to blanks, or click blank then click option'

AFlask

Bflask

CApp

Dapplication

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'flask' instead of 'Flask'

Importing 'App' or 'application' which do not exist

The Flask class must be imported with a capital 'F' as Flask to create the app instance.

2fill in blank

medium

Complete the code to define the application factory function name correctly.

Flask

def [1]():
    app = Flask(__name__)
    return app

Drag options to blanks, or click blank then click option'

Acreate_app

Binit_app

Cmake_app

Dstart_app

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'init_app' which is usually a method, not the factory function

Using 'start_app' or 'make_app' which are not standard names

The conventional name for the application factory function in Flask is create_app.

3fill in blank

hard

Fix the error in the code to register a blueprint inside the factory function.

Flask

def create_app():
    app = Flask(__name__)
    from .views import main
    app.[1](main)
    return app

Drag options to blanks, or click blank then click option'

Aadd_blueprint

Bregister_blueprint

Cinclude_blueprint

Dattach_blueprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add_blueprint' which does not exist

Using 'include_blueprint' or 'attach_blueprint' which are invalid

The correct method to add a blueprint to a Flask app is register_blueprint.

4fill in blank

hard

Fill both blanks to configure the app with a secret key and enable debug mode.

Flask

def create_app():
    app = Flask(__name__)
    app.config['[1]'] = '[2]'
    app.config['DEBUG'] = True
    return app

Drag options to blanks, or click blank then click option'

ASECRET_KEY

BDATABASE_URI

Cmysecretkey

Dproductionkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'DATABASE_URI' instead of 'SECRET_KEY' for the config key

Using 'productionkey' which is less common for examples

The secret key is set with the config key SECRET_KEY. The value can be any secret string like 'mysecretkey'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps blueprint names to their url prefixes.

Flask

blueprints = {
    '[1]': [2].url_prefix for [3] in app.blueprints.values()
}

Drag options to blanks, or click blank then click option'

Abp.name

Bbp

Dblueprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'blueprint' as the loop variable which is less common

Using incorrect keys or values that do not exist on blueprint objects

This comprehension creates a dictionary where each blueprint's name is the key and its url_prefix is the value. The variable iterating is commonly named 'bp'.