code: def named_series(self, ordering=None):
          '''Generator of tuples with name and serie data.'''
          series = self.series()
          if ordering:
              series = list(series)
              todo = dict(((n, idx) for idx, n in enumerate(self.names())))
              for name in ordering:
                  if name in todo:
                      idx = todo.pop(name)
                      yield name, series[idx]
              for name in todo:
                  idx = todo[name]
                  yield name, series[idx]
          else:
              for name_serie in zip(self.names(), series):
                  yield name_serif named_series(self, ordering=None):
          '''Generator of tuples with name and serie data.'''
          series = self.series()
          if ordering:
              series = list(series)
              todo = dict(((n, idx) for idx, n in enumerate(self.names())))
              for name in ordering:
                  if name in todo:
                      idx = todo.pop(name)
                      yield name, series[idx]
              for name in todo:
                  idx = todo[name]
                  yield name, series[idx]
          else:
              for name_serie in zip(self.names(), series):
                  yield name_serie
docs: Generator of tuples with name and serie data.