You need to change the `set_password` docstring to use `unicode` instead of `str`.
Also, the saved password seems to be `unicode`, so no need to decode here.
(see get_password here https://bitbucket.org/kang/python-keyring-lib/src/36a4bdaaf0afcda4a19b2aaa4eb968748124251d/keyring/backends/SecretService.py?at=default#cl-43)