djangoで一時ファイルをzipで作成して返却

import tempfile

with tempfile.TemporaryFile() as tmp:
        with zipfile.ZipFile(tmp, 'w', zipfile.ZIP_DEFLATED) as archive:
                data = []
                count = 1
                for item in (self._iter_csv_rows(
                    queryset=self._get_changelist_instance(request).get_queryset(request),                       charset=charset)):
        data.append(item)
        if len(data) >= 10000:
                        tmp2 = tempfile.TemporaryFile()
                        #csv作成
                        writer = csv.writer(tmp2)
                        writer.writerows(data)
                        tmp2.seek(0)
                        archive.writestr('{}-{}.csv'.format(self.model._meta.model_name,count), tmp2.read())
                        count += 1
                        data = []
                        tmp2.close()

        tmp.seek(0)
        res = HttpResponse(tmp.read(), content_type='application/x-zip-compressed')
        res['Content-Disposition'] = 'attachment; filename={base}_{dt}.zip'.format(
                base=self.model._meta.model_name,
                dt=datetime.now().strftime('%Y%m%d-%H%M%S'))
        res['Pragma'] = 'public'
        res['Cache-Control'] = 'public'

        return res