code: def file_client(self):
          '''
          Return a file client. Instantiates on first call.
          '''
          if not self._file_client:
              self._file_client = salt.fileclient.get_file_client(
                  self.opts, self.pillar_rend)
          return self._file_clienf file_client(self):
          '''
          Return a file client. Instantiates on first call.
          '''
          if not self._file_client:
              self._file_client = salt.fileclient.get_file_client(
                  self.opts, self.pillar_rend)
          return self._file_client
docs: Return a file client. Instantiates on first call.