text: # Welcome to the Flask-Bootstrap sample application. This will give you a
  # guided tour around creating an application using Flask-Bootstrap.
  #
  # To run this application yourself, please install its requirements first:
  #
  #   $ pip install -r sample_app/requirements.txt
  #
  # Then, you can actually run the application.
  #
  #   $ flask --app=sample_app dev
  #
  # Afterwards, point your browser to http://localhost:5000, then check out the
  # source.
  
  from flask import Flask
  from flask_appconfig import AppConfig
  from flask_bootstrap import Bootstrap
  
  from .frontend import frontend
  from .nav import nav
  
  
  def create_app(configfile=None):
      # We are using the "Application Factory"-pattern here, which is described
      # in detail inside the Flask docs:
      # http://flask.pocoo.org/docs/patterns/appfactories/
  
      app = Flask(__name__)
  
      # We use Flask-Appconfig here, but this is not a requirement
      AppConfig(app)
  
      # Install our Bootstrap extension
      Bootstrap(app)
  
      # Our application uses blueprints as well; these go well with the
      # application factory. We already imported the blueprint, now we just need
      # to register it:
      app.register_blueprint(frontend)
  
      # Because we're security-conscious developers, we also hard-code disabling
      # the CDN support (this might become a default in later versions):
      app.config['BOOTSTRAP_SERVE_LOCAL'] = True
  
      # We initialize the navigation as well
      nav.init_app(app)
  
      return app
  