How to get console output into a txt file (using python flask server)

Question

Let's suppose I have a server code and when the function savePersonList() is called, the result printed on console should be saved into a text file.

#server coding

app = Flask(__name__)
def allowed_file(filename):
  # this has changed from the original example because the original did not work for me
    return filename[-3:].lower() in ALLOWED_EXTENSIONS


@app.route('/', methods=['GET', 'POST']) #integrate code below function
def upload_file(): 

    if request.authorization and request.authorization.username == 'user1' and request.authorization.password == 'pass2': #login code line
        if request.method == 'POST':
            print("This is a post Request \n\n")
            file = request.files['file']
            if file and allowed_file(file.filename):
                print("File Sent is valid \n\n")
                print('**found file', file.filename)
                filename = secure_filename(file.filename) #use this from existing code before calling video capture 
                file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))  
    #code
                ''' This is the start of face recongition script '''
                CF.Key.set('d7c5495c64a44bc692761cd7c45ad56e')
                CF.BaseUrl.set('https://southeastasia.api.cognitive.microsoft.com/face/v1.0/')

                firstRun = True
                lastRun  = False

                #savePersonList()

Answer 1

The answer of srinath samala is correct in the general case, but as you mentionned on the comment, not all the output is redirected to the file.

---

This is because some output of your Flask app is redirected to STDERR, and not only STDOUT.

To redirect both into your txt file, you want to use this :

python app.py >> file.txt 2>&1