I'm trying to deploy a JustPy app on Heroku. I'm new to both.
Base code, from https://justpy.io/tutorial/getting_started/
# saved as app.py
import justpy as jp
app = jp.app # added for deployment
def hello_world():
wp = jp.WebPage()
jp.Hello(a=wp)
return wp
jp.justpy(hello_world)
To deploy to a Heroku account, get the Heroku tools from: https://devcenter.heroku.com/articles/heroku-cli
From your project folder:
pip install gunicorn
pip freeze > requirements.txt
# create Procfile web:- gunicorn app:app
# create runtime.txt:- Python 3.9.5
heroku login
heroku create justpyhi
git init
git add .
git config --global user.email "[email protected]"
git config --global user.name "whateverusername"
git commit -m "first commit"
heroku git:remote --app justpyhi
git push heroku master
heroku open
...and I get the following errors:
Starting process with command `gunicorn mainheroku l`
app[web.1]: bash: gunicorn: command not found
heroku[web.1]: Process exited with status 127
heroku[web.1]: State changed from starting to crashed
heroku[web.1]: State changed from crashed to starting
app[api]: Build succeeded
[Updated:] I'm getting this further error:
-----> Building on the Heroku-20 stack
-----> Using buildpack: heroku/python
-----> App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/python.tgz
More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
! Push failed
What am I doing wrong? All help gratefully received!
See https://devcenter.heroku.com/articles/getting-started-with-python?singlepage=true#define-a-procfile
You just need three files:
requirements.txt
# https://github.com/justpy-org/justpy
# install justpy
justpy
Procfile
web: python hello_world.py
hello_world.py
# saved as app.py
import justpy as jp
import os
app = jp.app # added for deployment
def hello_world():
wp = jp.WebPage()
jp.Hello(a=wp)
return wp
port=os.environ['PORT']
jp.justpy(hello_world,port=port,host='0.0.0.0')
The main issue is to pick up the assigned port from heroku via the "PORT" environment variable and to set the host to '0.0.0.0' to listen to all interfaces.
See