code: def find_nameid(self, userid, **kwargs):
          
          res = []
          try:
              _vals = self.db[userid]
          except KeyError:
              logger.debug("failed to find userid %s in IdentDB", userid)
              return res
  
          for val in _vals.split(" "):
              nid = decode(val)
              if kwargs:
                  for key, _val in kwargs.items():
                      if getattr(nid, key, None) != _val:
                          break
                  else:
                      res.append(nid)
              else:
                  res.append(nid)
  
          return res
docs: Find a set of NameID's that matches the search criteria.
  
          :param userid: User id
          :param kwargs: The search filter a set of attribute/value pairs
          :return: a list of NameID instances