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Questions tagged [flask]

Flask is a lightweight framework for developing web applications using Python.

Flask is a web application framework for . It has exceptional documentation, a large number of extensions and a friendly community on Discord. It is open source and BSD-3-Clause licensed.

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54068 questions
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How to I delete all Flask sessions?

How do I delete all sessions and cookies set by my Flask/python app. So that when users return they have to re-login. I want to do this each time I push a new version of the code to production otherwise.
nickponline
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How to actually upload a file using Flask WTF FileField

In my forms.py file I have I have class myForm(Form): fileName = FileField() In my views.py file I have form = myForm() if form.validate_on_submit(): fileName = secure_filename(form.fileName.file.filename) In my .html…
Siecje
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Running flask + gevent + requests not serving 'concurrently'

I kick off my flask app like this: #!flask/bin/python from app import app_instance from gevent.pywsgi import WSGIServer #returns and instance of the application - using function to wrap configuration app = app_instance() http_server =…
fansonly
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WTForms creating a custom widget

The WTForms documentation is woefully inadequate, they don't even show you one single example of a custom widget that isn't derived from another widget already. I am trying to make a button type, that isn't an in html: submit =…
Dexter
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Flask and Transfer-Encoding: chunked

We're trying get a Flask web service working, and we're having some issues with streaming posts - i.e. when the header includes Transfer-Encoding: chunked. It seems like the default flask does not support HTTP 1.1. Is there a work around for…
James Percent
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flask-login: Chrome ignoring cookie expiration?

I've got the authentication working with flask-login, but it seems like no matter what I use for the cookie duration in flask, the session is still authenticated. Am I setting the config variables properly for flask-login? I've…
reptilicus
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Flask-WTFform: Flash does not display errors

I'm trying to flash WTForm validation errors. I found this snippet and slightly modified it: def flash_errors(form): """Flashes form errors""" for field, errors in form.errors.items(): for error in errors: flash(u"Error…
Sean W.
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Flask App Using WTForms with SelectMultipleField

I have a Flask application that uses WTForms for user input. It uses a SelectMultipleField in a form. I can't seem to get the app to POST all items in the field when selected; it only sends the first item selected regardless of how many the user…
Raj
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Flask + mod_wsgi automatic reload on source code change

Does anyone know how to make a mod_wsgi automatically reload a Flask app when any of the modules changes? I've tried WSGIScriptReloading On, but no luck. The official documentation is kind of a bear ... I guess I'll give it a stab if no one knows.…
gatoatigrado
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Flask app occasionally hanging

I've been working on a Flask app which handles SMS messages using Twilio, stores them in a database, and provides access to a frontend via JSONP GET requests. I've daemonized it using supervisord, which seems to be working pretty well, but every few…
flatpickles
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Flask Babel - 'translations/de/LC_MESSAGES/messages.po' is marked as fuzzy, skipping

I cant get a basic translationto work in Flask Babel. Here are my steps. I have this in a page {{_("Hello")}} I run this command. pybabel extract -F babel.cfg -o messages.pot . I then run this command for German. pybabel init -i messages.pot -d…
Tampa
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jinja2 first x items in for ... if loop

I have the following loop in my jinja2 template {% for item in list if item.author == 'bob' %} I am trying to get the first 5 items who have bob as an author. I tried doing {% for item in list if item.author == 'bob' and loop.index <= 5 %} but it…
applechief
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Place to initialize DB in Flask

I'm developing app in Flask and it requires DB, so what I have is I do: app = Flask(__name__) @app.before_request def init_db_connection: # here I connect to my DB @app.teardown_request def destroy_db(exception): # here I destroy database…
Ignas Butėnas
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Flask not getting any data from jQuery request data

I've a handler for a URL, @app.route("/", methods=['POST']) @crossdomain(origin='*') def hello(): ss=str(request.data) print ss return ss The handler cannot retrive the data part of the request. When using jQuery: jQuery.ajax( { …
Noor
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How do I close a Server-Send Events connection in Flask?

The below has given an answer using node.js. How to close a "Server-Sent Events"-connection on the server? However, how to do the same thing in python Flask?
hllau
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