Deploying a Streamlit app in Pythonanywhere

[Charly_Wargnier]

Hi guys!

Do you know if there would be any challenges in deploying a Streamlit app on PythonAnywhere (https://www.pythonanywhere.com/)?

I’m looking for a quick and simple alternative to Heroku as unfortunately I’d need to deploy several apps on a laptop and I won’t be able to download Heroku’s CLI there (which I believe is mandatory to deploy apps?).

Happy to hear about any other alternatives for an easy Streamlit app deployment!

Thanks,
Charly

[chemalle]

Great, this is my doubt too.

[python]

Hi, has anyone tried installing and running the library from pythonanywhere ?

[Charly_Wargnier]

I’ve never tried but I suppose it should be do-able.

I use either Heroku or Streamlit Sharing.

Thanks,
Charly

[randyzwitch]

@Charly_Wargnier

I use either Heroku or Streamlit Sharing.

FTFY

[python]

This product needs to be portable on the web, a platform where you have to ask for hosting consideration and once deployed they are the only option is no option at all.

This is what I found so far, in regards to my question.

I imagine one of the reasons Streamlit devs chose Tornado as a framework was based on its asynchronous capabilities, unfortunately pythonanywhere only supports WSGI and Stramlit doesn’t. Streamlit might install and partially run on pythonanywhere but if/when it tries to make an asynchronous call an error will be generated.

I will not try to install the Streamlit in pythonanywhere based on what I found, for me Streamlit will have to wait.

Some of my reference material:

Streamlite forum

Integration with flask app

Hey @qxlsz, thanks for checking out Streamlit! Streamlit runs its own web server via the Tornado framework, and there’s no good way to embed a Streamlit app inside a Flask server. (Serving an interactive Streamlit app via flask.render_template isn’t feasible, because Streamlit apps are not static; when you interact with your Streamlit app, it is re-running your Python code to generate new results dynamically.) You could, however, run Streamlit alongside a Flask app (or possibly embed your Str…

“Streamlit runs its own web server via the Tornado framework, and there’s no good way to embed a Streamlit app inside a Flask server.”

Pythonanywhere

Using tornado

“However, if you’re using Tornado as a web framework and don’t care about the asynchronous stuff, you can use it on PythonAnywhere.”

Streamlite forum

Serving streamlit app using gunicorn in prod deployment

Hi @qxlsz, At this time Streamlit doesn’t support the WSGI protocol (linking here to the Tornado page about it, since Streamlit uses Tornado as a framework), so there’s no directly usable connection between gunicorn and Streamlit. (For more context, check out this quick article about what Gunicorn can and can’t do.) I’d recommend checking out this thread regarding deploying streamlit in a manner that resembles using gunicorn. Thanks for your question; let us know how it goes!

“At this time Streamlit doesn’t support the WSGI protocol”

[thierrytheg]

You could use the redirect to send your users from your flask app to your streamlit app or you can embed your streamlit through an iframe in your html.