code: def data_storage_dir(self):
          
          if self._data_storage_dir is None:
              self._data_storage_dir = tempfile.mkdtemp(prefix = "openfisca_")
              log.warn((
                  "Intermediate results will be stored on disk in {} in case of memory overflow. "
                  "You should remove this directory once you're done with your simulation."
                  ).format(self._data_storage_dir))
          return self._data_storage_dir
docs: Temporary folder used to store intermediate calculation data in case the memory is saturated