Bottle-simple-oauth-server is a project mainly written in Python, it's free.
simple 2-legged oauth (per request) for bottle
Verify 2-legged oauth (per request).
base on http://philipsoutham.com/post/2172924723/two-legged-oauth-in-python
Parameters accepted as values in "Authorization" header, or as a GET request
or in a POST body.
options consumer_secret : may be callable, dict, a string, or simple default secret == consumer_key