This is an example usage of the Authomatic Python library. You can see the source code of this app here.
None of your private data will be saved to any kind of persistent storage like database or session.

Error: Failed to obtain request token from https://api.twitter.com/oauth/request_token! HTTP status code: 403 content: Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings

Authentication

OpenID

GAE OpenID

Mozilla Persona

Authorization