dbus-python does not support exporting properties on an object. It is possible to support org.freedesktop.DBus.Properties.Get, Set, and GetAll but properties also need to be reported via org.freedesktop.DBus.Introspectable.
It would be nice to support defining properties with a decorator just like @dbus.service.method works for methods. It would also be nice to support a way to add a list of properties that could be called in __init__, since typically there are a good number of them.
*** This bug has been marked as a duplicate of bug 26903 ***