app.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from flask_bcrypt import Bcrypt

db = SQLAlchemy()
migrate = Migrate()
bcrypt = Bcrypt()


def create_app():
    app = Flask(__name__, template_folder="templates")
    app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///./test.db"
    app.secret_key = "SECRET"
    app.url_map.strict_slashes = False

    login_manager = LoginManager()
    login_manager.init_app(app)
    db.init_app(app)
    migrate.init_app(app, db)
    bcrypt.init_app(app)

    from models import User

    @login_manager.user_loader
    def load_user(uid):
        return User.query.get(uid)

    from routes import register_routes

    register_routes(app, db, bcrypt)

    return app