code: def init_app(self, app):
          
  
          self.__app = app
          self.__app.before_first_request(self.__setup)
  
          self.tracer.enabled = self.__app.config.get('TRACE_ENABLED', self.tracer.enabled)
docs: Initialize this class with the specified :class:`flask.Flask` application
  
          :param app: The Flask application.