Adds a :py:class:`.Series` to the chart.

        :param Series series: The :py:class:`.Series` to add.

def add_series(self, series):
        """Adds a :py:class:`.Series` to the chart.

        :param Series series: The :py:class:`.Series` to add."""

        if not isinstance(series, Series):
            raise TypeError("'%s' is not a Series" % str(series))
        self._all_series.append(series)
        series._chart = self