There is a link for the C library that the Python package uses. Most function names are identical (except for the gnome_keyring_ prefix). The Bending Gnome Keyring with Python on the blog should also give you a good start.
And as the keyring package has already been mentioned: if I remember correctly, this package supports gnome-keyring as a backend, so you can look at the source code to find out how to use gnome-keyring.
Andidog
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