import io
import zipfile

with zipfile.ZipFile(temp_path ,mode='w')as f:
    f.write(file)

buffer = io.BytesIO()
    # param1:写入对象 buffer
    # param2:mode write
    # param3:compression default'ZIP_STORED(no compression)
zip_file = zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED)
with zip_file:
    # param1:zip file name
    # param2:bytes file
    zip_file.writestr(str_file_name, file.read())
return buffer

import io
import urllib.parse
import zipfile

def write_file_to_zip(zip_name:str, files:List[str], md="w"):
    """
    args:
        zip_name: output zip file name
        files   : file path list, e.g.['C://temp//a.pdf','C://temp//b.pdf']
        md      : mode w:write, a:append 追加到既存的zip
    """
    try:
        # zip file path 指定，直接保存到指定的路径下
        temp_path = os.path.join(settings.UPLOAD_FOLDER, zip_name)
        
        with zipfile.ZipFile(temp_path ,mode=md) as f:
            for file in files:
                f.write(file)
        #with 结束后，f.close()自动执行，文件保存完毕

        # 若需要返回response-------------------------------------------start------------
        # encode file name
        quoted_filename = urllib.parse.quote(zip_name)
        response = HttpResponse(open(temp_path, 'rb').read())
        response['Content-Type'] = 'application/x-zip-compressed'
        response['Content-Disposition'] = f"attachment;  filename={quoted_filename}"
        return response
        # 若需要返回response-------------------------------------------end--------------
    except Exception as e:
        print("異常タイプ:%s"%type(e))
        print("異常内容:%s"%e)

import io
import urllib.parse
import zipfile

def write_file_to_zip(files:List[object]):
    """zip output \n
    return BytesIO without download
    args:
        files: [filename:str, file:BytesIO/BufferedReader]
    """
    try:
        buffer = io.BytesIO()
        # param1:写入对象 buffer
        # param2:mode write
        # param3:compression default'ZIP_STORED(no compression)
        zip_file = zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED)
        with zip_file:
            for file in files:
                # param1:zip file name
                # param2:bytes file
                zip_file.writestr(file[0], file[1].read())
        return buffer


↑ 调用
def test():
    # 任意文件路径 例'C://temp//a.pdf'
    file_path = os.path.join(settings.UPLOAD_FOLDER, 'folder', 'filename.pdf')
    if os.path.exists(file_path):
        f = open(file_path, 'rb')

    # 调用
    buffer = write_file_to_zip(['arcname.pdf', f])
    
    #--直接写入文件---------------------------------------start-----------------
    f = open('test.zip',"wb")
    f.write(buffer.getbuffer())   # buffer.getvalue() 也可
    f.close()
    #--直接写入文件---------------------------------------end-------------------
    
    #--返回前端----------------------------response------start-----------------
    # レスポンスの設定
    response = HttpResponse(buffer.getvalue())
    response['Content-Type'] = 'application/x-zip-compressed'
    # ダウンロードするファイル名
    quoted_filename = urllib.parse.quote(filename)
    response['Content-Disposition'] = f"attachment;  filename={quoted_filename}"
    return response
    #--返回前端-----------------------------response------end-------------------

//button click
$('#btn-dl').on("click", function(e){
    e.preventDefault();
    let url = '{% url "app:data_dl" %}'
    
    let selected_rows = table.getSelectedRows();
    let id_list = [];
    selected_rows.forEach((el, idx, arr)=>{
        id_list.push(el.id);
    });
    
    file_download(url, id_list);
});


function file_download(url, id){
    let post_data = JSON.stringify({id});
    let oReq = new XMLHttpRequest();
    oReq.open("POST",url,true);
    oReq.setRequestHeader("Content-Type", "application/json");
    oReq.setRequestHeader("X-CSRFToken", getCookie('csrftoken'));
    oReq.responseType = "blob";
    oReq.onload = function(eEvent){
        if (oReq.status == 200){
            var disposition = oReq.getResponseHeader('Content-Disposition');
            let download_name = disposition.split('filename=')[1];
            let file_name = decodeURI(download_name);
            let blob = oReq.response;
            let link = document.createElement("a");
            link.href = window.URL.createObjectURL(blob);
            link.download = file_name;
            link.click();
        }else{
            console.log("ファイルダウンロード失敗");
        }
    }
    oReq.send(post_data);
}