code: def get_children_from_slice(self, s):
          
          if isinstance(s.start, str):
              s = slice(
                  self.get_index_from_name(s.start), s.stop, s.step)
          if isinstance(s.stop, str):
              s = slice(
                  s.start, self.get_index_from_name(s.stop), s.step)
          return WellSeries(self.get_children_list()[s])
docs: Retrieves list of children within slice