please bump version of dev-python/requests-oauthlib to v0.5.0. The old version is over a year old and lacks some functions. See https://github.com/requests/requests-oauthlib/blob/master/HISTORY.rst Thank you, Daniel
In the meantime 0.6.2 was released.
*** Bug 591040 has been marked as a duplicate of this bug. ***
Bumped to 0.6.2. Thanks for the reminder.