The app initialization for the ToDoList API is defined here.

__init__.py

"""
Setup an initialization to delay the creation of the application after runtime.

This helps to enable the use of blueprint if we ever want to use it in the future.
"""
from flask import Flask
from flask_sqlalchemy import SQLAlchemy

from config import config

db = SQLAlchemy()


def create_app(config_name):
    """Initialize the application after runtime."""
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    db.init_app(app)

    return app