openid along with oauth?

In my application, users sign in/sign out via openid ( same as stackoverflow ).

I would like to open up my application a bit via oauth to third party applications.

How do I create my app which is openid-consumer to make it oauth-provider?

Is there some standard library etc out there? I am basically working in app engine and python.

edit :

Maybe I did not clearly state my problem. I am using OpenID for 开发者_开发问答authentication. So I do not have user passwords, just their unique federated Identity. My application needs to use third party application. I.e. kind of application that runs inside orkut and facebook. (Do you think opensocial is a a viable option instead of OAuth??)

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OAuth python libraries are listed on this page: http://oauth.net/code/

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OAth and OpenID are had native support by app engine sinve 1.3.4. So you can implement transparent and solid authorization/authentication mechanism.