django导出数据到excel

import xlwt,StringIo
def dumpData(request):
    #获取数据
    activitys = Activity.objects.all().order_by('id')
    if activitys:
        #创建workbook对象并设置编码
        ws = xlwt.Workbook(encoding='utf-8')
        w = ws.add_sheet(u'评论完成',cell_overwrite_ok=True)
        w.write(0, 0, u"订单编号")
        w.write(0, 1, u"买家")
        w.write(0, 2, u"购买时间")
        w.write(0, 3, u"付款金额")
        w.write(0, 4, u"提交订单号")
        w.write(0, 5, u"返现金额")
        w.write(0, 6, u"状态")
        excel_row = 1
        for activity in activitys:
            id = activity.id
            buyer = activity.buyer.buyer.username
            time = activity.time
            price = activity.pay
            orderId = activity.orderId
            payBack = activity.payBack
            status = activity.status
            w.write(excel_row, 0, id)
            w.write(excel_row, 0, buyer)
            w.write(excel_row, 0, time)
            w.write(excel_row, 0, price)
            w.write(excel_row, 0, orderId)
            w.write(excel_row, 0, payBack)
            w.write(excel_row, 0, status)
            excel_row += 1
        exist_file = os.path.exists('test.xls')
        if exist_file:
            os.remove(r'test.xls')
        ws.save('test.xls')
        #返回文件给客户
        sio = StringIO.StringIO()
        ws.save(sio)
        sio.seek(0)
        response = HttpResponse(sio.getvalue(), content_type='application/vnd.ms-excel')
        response['Content-Disposition'] = 'attachment; filename=test.xls'
        response.write(sio.getvalue())
        return response