text: from flask import Flask
  from configs.base_config import config_options
  from flask_sqlalchemy import SQLAlchemy
  from flask_login import LoginManager
  from flask_uploads import UploadSet, configure_uploads, IMAGES
  from flask_mail import Mail
  
  login_manager = LoginManager()
  login_manager.session_protection = 'strong'
  login_manager.login_view = 'auth.login'
  
  db = SQLAlchemy()
  photos = UploadSet('photos', IMAGES)
  mail = Mail()
  
  def create_app(config_name):
      '''
      Function that creates a instance of the app on run
      Args:
          config_name: configuration setting (development,production or test)
      '''
      app = Flask(__name__)
      # Set the app configurations
      app.config.from_object(config_options[config_name])
  
      # Initializing Flask Extensions
      db.init_app(app)
      login_manager.init_app(app)
      mail.init_app(app)
      
      # configure UploadSet
      configure_uploads(app, photos)
  
      # Register blue prints
      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