code: def chunk_size(self, value):
          
          if value is not None and value > 0 and value % self._CHUNK_SIZE_MULTIPLE != 0:
              raise ValueError(
                  "Chunk size must be a multiple of %d." % (self._CHUNK_SIZE_MULTIPLE,)
              )
          self._chunk_size = value
docs: Set the blob's default chunk size.
  
          :type value: int
          :param value: (Optional) The current blob's chunk size, if it is set.
  
          :raises: :class:`ValueError` if ``value`` is not ``None`` and is not a
                   multiple of 256 KB.