docs: def remove_series(self, series):
          """Removes a :py:class:`.Series` from the chart.
  
          :param Series series: The :py:class:`.Series` to remove.
          :raises ValueError: if you try to remove the last\
          :py:class:`.Series`."""
  
          if len(self.all_series()) == 1:
              raise ValueError("Cannot remove last series from %s" % str(self))
          self._all_series.remove(series)
          series._chart = None