dash-table | A First-Class Interactive DataTable for Dash

I’ve been developing a dash app that uses a long_callback, and for development I’ve been using a diskcache backend for my long_callback_manager, as recommended by the guide I found here: https://dash.plotly.com/long-callbacks

When I tried running my app using gunicorn, it failed to start because of something apparently wrong with diskcache. As such, I decided to switch to a celery/redis backend since that’s recommended for production anyway.

I got a redis server running (responds properly to redis-cli ping with PONG), and then started the app again. This time it started up fine, and all of the normal callbacks work, but the long_callback does not work.

Details:

• The page more or less hangs, with the page title flashing between the normal title and the Updating... title, indicating that the app thinks it’s “waiting” for a response/update from the long_callback.
• The values set by the running argument of the long_callback are set to their starting value, indicating that the app recognizes that the long_callback ought to run.
• By placing a print statement as the first line within the long_callback function and seeing that it does not print, I’ve determined that the function never starts.
• The failure happens both with gunicorn and without gunicorn.

These details all point to the problem being the celery/redis backend. No errors are shown, neither on the client/browser nor on the server’s stdout/sterr.

How do I get a celery/redis backend working?

UPDATE: After realizing that the __name__ variable is being used and that its value changes depending on the file from which it is referenced, I've also tried moving the code which creates celery_app and LONG_CALLBACK_MANAGER into app.py, to no avail. The exact same thing happens.

I keep seeing an error message during my docker build, at the part where docker tries to install my requirements.txt file that says Module Not Found. However, half of the time the version of the module it says it can't find is in the list of versions available.

I keep trying older versions and eventually I'll find one that works but then the same thing will happen on the next package. It's taking hours to try and build one container which surely can't be right. I'm assuming it might be something to do with packages might not be passing between different layers of the containers, but I'm new to Docker so can't tell if this is the issue or how to fix it.

I'm using WSL2 (Ubuntu 20.04) to build a flask application in Python (well technically it's a Plotly Dash app but I've read it works the same as flask). I have a Windows 10 machine and I've ensured that Docker is set to be compatible with WSL2 and Ubuntu. I've pasted a few of the many errors I've been getting below, as well as my current requirements.txt, Dockerfile and file structure.

I'd like to know how to prevent this message from keep coming up and how to know which package is compatible with Docker? Any help would be appreciated.

Some of my error messages that I'm seeing are:

I'm starting a plotly and dash application with Python. At the top is a menu with three tabs: Home, Create, and Load. We start off at the Home screen.

My problem: through clicking a button within the 'Home' tab, I would like to redirect to the 'Open' tab. Any ideas on how I could go about clicking a button within one tab in order to go to another tab?

Included below is the file where I"m trying to solve this issue:

I want to deploy a dash application on Gunicorn. But I am not able to do so. I see no errors appearing on the screen when I execute the gunicorn :

Versions:

• gunicorn (20.0.4)
• dash (1.17.0)
• dash-core-components (1.13.0)
• dash-html-components (1.1.1)
• dash-renderer (1.8.3)
• dash-table (4.11.0)

my dash application, file name: analyzer.py

I am trying to deploy a Plotly Dash app as an AWS Lambda using Serverless framework. The app works as expected locally and I can start it using serverless wsgi serve command. serverless deploy reports success. However when invoked, lambda fails with the following error:

I have a data-table displayed on screen and I built a litle dropdown menu because I want to filter the table based on the value selected on this widget. While no error gets outputed, the table does not update. It just remains the same. I have followed this post for help Plotly Dash table callback. I feel like I am super close but cannot figure out what is wrong.

here is what I have been able to do so far: html code:

I am trying to migrate my Django database after installing django_plotly_dash and am receiving this error even though I have dash installed and working fine. Any ideas why this will not work when I try it with Django?

Command:

GOAL

• My final goal would be to run this kaggle project locally in a conda environment.
• I am running this on Ubuntu 20.04 LTS, conda environment, python 3.8

INPUT

• I have got recommended to run this code because I have library dependencies issues.

I am trying serve a (python3.8.2) dash application using an Apache2 server and mod_wsgi, but the application stops on the "Loading..." screen. The server returns 404s for each of dash's .js scripts. I've had no problems when using dash's built in local server... but I'm not trying to serve this locally.

I'd love some advice on where I'm going wrong, and how to get this particular app up and running.

I am able to serve both a simple python "hello world" and a simple flask app, using my setup. However, when creating a simple 'dash' app...