notes.txt

pip install virtualenv

mkdir smule-heroku
cd smule-heroku

git init
virtualenv venv
cd venv
cd Scripts
activate

pip install dash
pip install gunicorn

pip freeze > requirements.txt

cd ..

git add app.py
git add Procfile
#procfile contains: "web: gunicorn app:server --log-file=-"
git add requirements.txt

heroku create <appname>
git add .
git commit -m "message"
git push heroku master

heroku ps:scale web=1


for selenium:

heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-chromedriver
heroku buildpacks:add --index 2 https://github.com/heroku/heroku-buildpack-google-chrome
heroku config:set GOOGLE_CHROME_BIN=app/.apt/usr/bin/google_chrome
heroku config:set CHROMEDRIVER_PATH=app/.chromedriver/bin/chromedriver

in the code:
GOOGLE_CHROME_BIN = '/app/.apt/usr/bin/google_chrome'
CHROMEDRIVER_PATH = '/app/.chromedriver/bin/chromedriver'
chrome_options.add_argument('--disable-gpu')
chrome_options.add_argument('--no-sandbox')
chrome_options.binary_location = GOOGLE_CHROME_PATH
browser = webdriver.Chrome(execution_path=CHROMEDRIVER_PATH, chrome_options=chrome_options)