docs: def put_item(self, fpath, relpath):
          """Put item with content from fpath at relpath in dataset.
  
          Missing directories in relpath are created on the fly.
  
          :param fpath: path to the item on local disk
          :param relpath: relative path name given to the item in the dataset as
                          a handle
          """
          # Put the file into iRODS.
          fname = generate_identifier(relpath)
          dest_path = os.path.join(self._data_abspath, fname)
          _cp(fpath, dest_path)
  
          # Add the relpath handle as metadata.
          _put_metadata(dest_path, "handle", relpath)
  
          return relpath