def setSpan(self, row, col, rowSpan, colSpan):
        pass
Return ports as list of strings
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/spreadsheet/spreadsheet_tab.py/StandardWidgetSheetTabInterface.setSpan--crossover with--dataset/ETHPy150Open j-bennet/wharfee/wharfee/formatter.py/format_port_lines