def deleteAllCells(self):
        (rowCount, columnCount) = self.getDimension()
        for r in xrange(rowCount):
            for c in xrange(columnCount):
                self.deleteCell(r, c)
Sync will get called periodically by the heartbeat method.
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/spreadsheet/spreadsheet_tab.py/StandardWidgetSheetTabInterface.deleteAllCells--crossover with--dataset/ETHPy150Open airbnb/airflow/airflow/executors/base_executor.py/BaseExecutor.sync