I have been using the pykeyring library in the port for Ubuntu One on Windows. One of the additions I made to the library in this fork was the feature to be able to delete a password from the keyring.
I think that other developer will find this addition to be useful. I have also fixed a number of pep8 issues present in the code to try and be consistent with the style that is recommended to be used in python.
Tests with failures:
I send you the whole output, if you want to have a look.
Also, I have nothing against PEP8, but next time, can you do it as a separate patch: since it has nothing to do with this pull request, it would have been much much easier to review this request and the PEP8 pull request after :)