text: from flask import Flask
  from flask_bootstrap import Bootstrap
  from config import config_options
  from flask_login import LoginManager
  from flask_sqlalchemy import SQLAlchemy
  from flask_mail import Mail
  from flask_uploads import UploadSet, configure_uploads, IMAGES
  # from flask_bcrypt import Bcrypt 
  from flask_wtf.csrf import CSRFProtect
  
  bootstrap = Bootstrap()
  db = SQLAlchemy()
  mail = Mail()
  photos = UploadSet('photos', IMAGES)
  
  login_manager = LoginManager()
  login_manager.session_protection = 'strong'
  login_manager.login_view = 'auth.login'
  
  def create_app(config_name):
  
      app = Flask(__name__)
  
      # Creating the app configs
      app.config.from_object(config_options[config_name])
      app.config['SECRET_KEY'] = 'mysecretkey'
  
      # Initializing flask extensions
      bootstrap.init_app(app)
      db.init_app(app)
      login_manager.init_app(app)
      mail.init_app(app)
      # bcrypt = Bcrypt()
      csrf = CSRFProtect(app)
  
      # Registering the blueprint
      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')
  
      # configure UploadSet
      configure_uploads(app, photos)
  
  
      return app
  