烧瓶上传CSV文件而不保存

Question

trying to place my text classification model into flask applications using CSV file upload to read data without saving the uploaded .csv file and throw it into my classifier model print it on the result pages. below example code of my attempt :

@app.route('/', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        file = request.files['file']
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

            file.stream.seek(0) 
            myfile = file.file 
            dataframe = pd.read_csv(myfile)
            return
        else:
            return "Not Allowed"

    return render_template("home.html")

This is my form

<form action="" method=post enctype=multipart/form-data>
            <input type=file name="file[]" multiple>
            <input type=submit value=Upload>
</form> 

exception occurred here

NameError: name 'allowed_file' is not defined

Any idea about this kind of issue ?

Answer 1

I think you are using this part of documentation : ( http://flask.pocoo.org/docs/0.12/patterns/fileuploads/ )

But you have to add the function :

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS`

Answer 2

Have you created a function called allowed_file() in your module? Or have you created it in another module and forgotten to import it? You're feeding your filename into the function allowed_file() so that it can check whether the filename is permitted, but the NameError indicates that the function allowed_file() cannot be found.