如何用图片保存QTableWidget？

Question

我有一张桌子。 当你想保存时，我得到了内存地址 PyQt4.QtGui.QTableWidgetItem对象位于0x0000000003E92CA8 这样做

    def save_file(self):
    filename = (QFileDialog.getSaveFileName(self, 'Save', '', ".xls(*.xls)"))
    wbk = xlwt.Workbook()
    sheet = wbk.add_sheet("diagram", cell_overwrite_ok=True)
    self.s_f(sheet)
    wbk.save(filename)

def s_f(self, sheet):
    for currentColumn in range(self.table.columnCount()):
        for currentRow in range(self.table.rowCount()):

            my_icon = self.table.item(currentRow, currentColumn)
            sheet.write(currentRow, currentColumn, str(my_icon or ''))

如何使用图片保存表格？