code: def staging_data(self):
          
          if self._staging_data is None:
              staging_data = []
              for staging_file in self.profile.get('data_files') or []:
                  if os.path.isfile(staging_file):
                      print(
                          'Staging Data: {}{}{}'.format(c.Style.BRIGHT, c.Fore.MAGENTA, staging_file)
                      )
                      self.log.info('[stage] Staging data file: {}'.format(staging_file))
                      f = open(staging_file, 'r')
                      staging_data.extend(json.load(f))
                      f.close()
                  else:
                      print(
                          '{}{}Could not find file {}.'.format(
                              c.Style.BRIGHT, c.Fore.RED, staging_file
                          )
                      )
              self._staging_data = staging_data
          return self._staging_data
docs: Read data files and return all staging data for current profile.