A simple Python + Flask web app that demonstrates the flow of obtaining a Twitter user OAuth access token.

1. Obtain consumer key and secret from the Twitter Developer portal. The app should be configured to enable Sign in with Twitter. See twauth-web.py for more details, but you can either:
   1. add these values to a config.cfg file (local deployment); or
   2. set environment variables TWAUTH_APP_CONSUMER_KEY and TWAUTH_APP_CONSUMER_SECRET (cloud deployment)
2. Setup a pipenv environment, and install dependencies:
   1. pipenv install
   2. pipenv shell
3. Start the app:
   1. python3 ./twauth-web.py; or
   2. gunicorn twauth-web:app

Note: the app must have an Internet-accessible URL - do not attempt to connect via localhost, as this will not work. You can run a tunnel e.g. ngrok for local use, or deploy to a cloud platform such as Heroku (a Procfile is included).

Open a browser window on your demo app's external URL. Don't click the buttons yet!

Finally, revisit the dev portal, and add your app's callback URL (https://your-deployed-url/callback) to the callback URL whitelist setting. Once saved, follow the instructions on the app's web UI to click through the demo pages.

Twitter Developer Portal
Flask
python-oauth2
Bootstrap

Original version by Jacob Petrie
https://twitter.com/jaakkosf
https://github.com/jaakko-sf/twauth-web