docs: def delete(self, uuid):
          # type: (UUID) -> None
          """Delete file with given uuid.
  
          :param:uuid: :class:`UUID` instance
          :raises:KeyError if file does not exists
          """
          dest = self.abs_path(uuid)
          if not dest.exists():
              raise KeyError("No file can be found for this uuid", uuid)
  
          dest.unlink()