code: def get_nts(self, goids=None, sortby=None):
          
          nts = []
          # User GO IDs
          if goids is None:
              goids = self.go_sources
          else:
              chk_goids(goids, "GoSubDag::get_nts")
          if goids:
              ntobj = cx.namedtuple("NtGo", " ".join(self.prt_attr['flds']))
              go2nt = self.get_go2nt(goids)
              for goid, ntgo in self._get_sorted_go2nt(go2nt, sortby):
                  assert ntgo is not None, "{GO} NOT IN go2nt".format(GO=goid)
                  if goid == ntgo.GO:
                      nts.append(ntgo)
                  else:
                      fld2vals = ntgo._asdict()
                      fld2vals['GO'] = goid
                      nts.append(ntobj(**fld2vals))
          return nts
docs: Given GO IDs, get a list of namedtuples.