code: def data_labels(self):
          
          dLbls = self._element.dLbls
          if dLbls is None:
              raise ValueError(
                  'plot has no data labels, set has_data_labels = True first'
              )
          return DataLabels(dLbls)
docs: |DataLabels| instance providing properties and methods on the
          collection of data labels associated with this plot.