def __iadd__(self, other):
        if not isinstance(other, ChartBase):
            raise TypeError("Only other charts can be added")
        self._charts.append(other)
        return self
Combine the chart with another one
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/openpyxl-2.3.0-b2/openpyxl/chart/_chart.py/ChartBase.__iadd__