text: from flask import Flask 
  from flask_bootstrap import Bootstrap 
  from flask_sqlalchemy import SQLAlchemy 
  from flask_login import LoginManager
  from config import config
  
  db = SQLAlchemy()
  bootstrap = Bootstrap()
  login_manager = LoginManager()
  login_manager.session_protection = 'strong'
  login_manager.login_view = 'auth.login'
  
  def create_app(config_name):
      app = Flask(__name__)
      app.config.from_object(config[config_name])
  
      db.init_app(app)
      bootstrap.init_app(app)
      login_manager.init_app(app)
  
      from .main import main as main_blueprint
      from .auth import auth as auth_blueprint
      app.register_blueprint(main_blueprint)
      app.register_blueprint(auth_blueprint,url_prefix="/auth")
  
      return app