Setting up a Dash App on PythonAnywhere

After opening an account on pythonanywhere, go to the Web tab and select Add a new web app.

When prompted to select a Python Web framework, choose Flask.

Choose your python version. Here, I am choosing Python 3.6 (Flask 0.12).

Enter a path for a Python file I wish to hold my Dash app. I entered:

/home/username/mysite/dashing_demo_app.py

Put the script of your Dash app in dashing_demo_app.py. You can use the script in the sample file dashing_demo_app.py provided on the GitHub repo of pythonanywhere’s staff.

Next I have to set up a virtual environment that the app is running in. I am using the requirements3.6.txt provided in the above GitHub repo.

Go to the Files tab to create requirements3.6.txt in your home directory. Then, go to the Consoles tab to start a new bash session. Create a virtual environment dashappenv with the following command in the home directory:

mkvirtualenv dashappenv --python=/usr/bin/python3.6
pip install -r requirements3.6.txt

Then, go to the Web tab and enter under Virtualenv the path of your virtual environment:

/home/username/.virtualenvs/dashappenv

Lastly, modify your WSGI file. Instead of

from dashing_demo_app import app as application

provided, enter

from dashing_demo_app import app
application = app.server

to import your app.

It’s all done. Go to Web to reload your app. You can then click the URL of your webapp and see it running. :) Here is the sample webapp I built based on the example in Dash tutorial.