How can I run a Python function that handles files in background?

Question

I've been trying to run a file handling function in Python in a background thread using default threading library but the Chrome tab still waits for the api to finish the processing. I've tried threading & multiprocessing with no luck

Here is a snippet:

@app.route('/', methods=['GET', 'POST'])
def hello_world():
    if request.method == 'GET':
        return render_template('upload.html')
    else:
        file = request.files['file']
        path = os.getcwd() + '\\tempFilesAudio\\'
        if not os.path.exists(os.getcwd() + '\\' + 'tempFilesAudio'):
            os.mkdir(os.getcwd() + '\\' + 'tempFilesAudio')
        if not os.path.exists(os.getcwd() + '\\' + 'tempFilesTransciption'):
            os.mkdir(os.getcwd() + '\\' + 'tempFilesTransciption')
        file.save(path + secure_filename(file.filename))
        file_path = path + file.filename
        conv_path = convert(file_path)
        print('converted:{}'.format(conv_path))
        pr = r.Recogniser()
        # this is a thread
        Thread(target=pr.recognize(conv_path),daemon=True).start()
        return redirect('/')

Answer 1

I understand you want to do this

from multiprocessing import Pool

# list of variables for Pool
args=[1, 2, 3, 4] 

# We want to execute 4 threads at time
pool = Pool(4)

# Executing multithread process, we execute one function by item on the list
# This is like:
    # functionName(args[0])
    # functionName(args[1])  
    # functionName(args[2])
    # functionName(args[3])
pool.map(functionName, args) 

# We wait for the processes to finish
pool.close()
pool.join()

Is this correct?

If this is correct, also, you can use 'nohup' as Nano_developer told you, and execute your code without keep your session (This is the correct way), you need to do this from command line:

nohup python myFile.py