code: def partition(self, ref, localize=False):
          
  
          if not ref:
              raise NotFoundError("No partition for empty ref")
  
          try:
              on = ObjectNumber.parse(ref)
              ds_on = on.as_dataset
  
              ds = self._db.dataset(ds_on)  # Could do it in on SQL query, but this is easier.
  
              # The refresh is required because in some places the dataset is loaded without the partitions,
              # and if that persist, we won't have partitions in it until it is refreshed.
  
              self.database.session.refresh(ds)
  
              p = ds.partition(ref)
  
          except NotObjectNumberError:
              q = (self.database.session.query(Partition)
                   .filter(or_(Partition.name == str(ref), Partition.vname == str(ref)))
                   .order_by(Partition.vid.desc()))
  
              p = q.first()
  
          if not p:
              raise NotFoundError("No partition for ref: '{}'".format(ref))
  
          b = self.bundle(p.d_vid)
          p = b.wrap_partition(p)
  
          if localize:
              p.localize()
  
          return p
docs: Finds partition by ref and converts to bundle partition.
  
          :param ref: A partition reference
          :param localize: If True, copy a remote partition to local filesystem. Defaults to False
          :raises: NotFoundError: if partition with given ref not found.
          :return: orm.Partition: found partition.