python 生成excel，并下载到本地

from django.shortcuts import reverse,redirect,render
from operations import models
import xlwt
import os
from io import BytesIO
from django.http import HttpResponse

def phone_download(request):
    phone_all = models.Phone.objects.all()
    if phone_all:
        # 创建工作簿
        wb = xlwt.Workbook(encoding='utf-8')
        sheet = wb.add_sheet('order-sheet')
        # 写入文件标题
        sheet.write(0, 0, '厂商')
        sheet.write(0, 1, '型号')
        sheet.write(0, 2, 'CPU')
        sheet.write(0, 3, '系统版本')

        data_row = 1

        for i in phone_all:
            sheet.write(data_row, 0, i.firms)
            sheet.write(data_row, 1, i.model)
            sheet.write(data_row, 2, i.CPU)
            sheet.write(data_row, 3, i.version)
            data_row = data_row + 1

        # 保存于本地
        # exist_file = os.path.exists("test.xls")
        # if exist_file:
        #     os.remove(r"test.xls")
        # wb.save("test.xls")

        # 返回文件给用户，用户操作浏览器对话框保存文件
        sio = BytesIO()
        wb.save(sio)
        sio.seek(0)
        # http响应头告知浏览器，返回excel
        response = HttpResponse(sio.getvalue(), content_type='application/vnd.ms-excel')
        # 浏览器打开/保存的对话框
        response['Content-Disposition'] = 'attachment; filename=test.xls'
        # 响应体
        response.write(sio.getvalue())
        return response

models数据结构　　

class Phone(models.Model):
    id = models.AutoField(primary_key=True)
    firms = models.CharField(max_length=32,verbose_name="厂商")
    model = models.CharField(max_length=32,verbose_name="型号")
    CPU = models.CharField(max_length=32,verbose_name="CPU")
    version = models.CharField(max_length=32,verbose_name="系统版本")