The file uploaded via flask is not saved, how to save?

Question

Flask

I tried saving the file via the standard save function and via with open (see below)

db_sess = db_session.create_session()
    try:
        news = db_sess.query(News).get(news_id)
    except Exception as ex:
        print(ex)
        return abort(404)
    if request.method == "GET":
        return render_template("edit_news.html", news=news)
    form = request.form
    file = request.files
    if "img" in file.keys():
        file = file["img"]
        filename = file.filename
        filetype = filename.rsplit(".", 1)[1]
        if file and "." in filename and filetype in ALLOWED_IMAGES_TYPES:
            filename = f'{datetime.datetime.now().strftime("%d.%m.%Y;%H:%M:%S")}.{filetype}'
            file.save(os.path.join(UPLOAD_FOLDER, secure_filename(filename)))
            news.img = filename
        news.commit()

Second option (via open)

db_sess = db_session.create_session()
    try:
        news = db_sess.query(News).get(news_id)
    except Exception as ex:
        print(ex)
        return abort(404)
    if request.method == "GET":
        return render_template("edit_news.html", news=news)
    form = request.form
    file = request.files
    if "img" in file.keys():
        file = file["img"]
        filename = file.filename
        filetype = filename.rsplit(".", 1)[1]
        if file and "." in filename and filetype in ALLOWED_IMAGES_TYPES:
            filename = f'{datetime.datetime.now().strftime("%d.%m.%Y;%H:%M:%S")}.{filetype}'
            with open(os.path.join(UPLOAD_FOLDER, secure_filename(filename)), "w") as f:
                f.write(file.read())
            news.img = filename
    news.commit()

Answer 1

I figured it out: the UPLOAD_FOLDER constant equal to "/static/pictures/" was used in the code. All you had to do was remove the / in front of the whole path

Answer 2

Check that all conditions are met.
file.save() takes a path to a folder (maybe a file) as parameters and saves it there. Check what os.path.join returns.