code: def _load_raw_data(self, resource_name):
          
          # Instantiating the resource again as a simple `Resource` ensures that
          # ``data`` will be returned as bytes.
          upcast_resource = datapackage.Resource(
              self.__resources[resource_name].descriptor,
              default_base_path=self.__base_path)
          return upcast_resource.data
docs: Extract raw data from resource
  
          :param resource_name: