def add_chart ( self , chart , row , col ) : self . __charts . append ( ( chart , ( row , col ) ) )
python 'worksheet' object is not callable
Adds a chart to the worksheet at ( row col ) .
def add_chart(self, chart, row, col):
        """
        Adds a chart to the worksheet at (row, col).

        :param xltable.Chart Chart: chart to add to the workbook.
        :param int row: Row to add the chart at.
        """
        self.__charts.append((chart, (row, col)))