human
Complete this python program:
def _fixed_cbLogin(self, xxx_todo_changeme):
assistant
#Here is the Python code you requested.

    """Ensure that the avatar to be returned to the client is jellyable and
    set up disconnection notification to call the realm\s logout object.
    """
    (interface, avatar, logout) = xxx_todo_changeme
    if (not IJellyable.providedBy(avatar)):
        avatar = pb.AsReferenceable(avatar, 'perspective')
    puid = avatar.processUniqueID()
    logout = [logout]
    def maybeLogout():
        if (not logout):
            return
        fn = logout[0]
        del logout[0]
        fn()
    self.broker._localCleanup[puid] = maybeLogout
    self.broker.notifyOnDisconnect(maybeLogout)
    return avatar