'Add a new chartsheet to the Excel workbook.
Args:
name: The chartsheet name. Defaults to \'Sheet1\', etc.
Returns:
Reference to a chartsheet object.'

def add_chartsheet(self, name=None, chartsheet_class=None):

    if (chartsheet_class is None):
        chartsheet_class = self.chartsheet_class
    return self._add_sheet(name, worksheet_class=chartsheet_class)
