text: from flask import Flask
  from flask_bootstrap import Bootstrap
  from flask_sqlalchemy import SQLAlchemy
  from flask_login import LoginManager
  from config import config_options
  from flask_bcrypt import Bcrypt
  from flask_mail import Mail
  
  bootstrap = Bootstrap()
  db = SQLAlchemy()
  login_manager = LoginManager()
  login_manager.session_protection = 'strong'
  login_manager.login_view = 'auth.login'
  login_manager.login_message_category = 'info'
  bcrypt = Bcrypt()
  mail = Mail()
  
  
  def create_app(config_name):
  
      app = Flask(__name__)
      app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
  
      
      app.config.from_object(config_options[config_name])
  
      
      bootstrap.init_app(app)
      db.init_app(app)
      login_manager.init_app(app)
      bcrypt.init_app(app)
      mail.init_app(app)
  
      
      from .main import main as main_blueprint
      app.register_blueprint(main_blueprint)
  
      
      from .auth import auth as auth_blueprint
      app.register_blueprint(auth_blueprint, url_prefix='/authenticate')
  
      return app