How to use the scenario.DeclineInviteScenario function in scenario

def decline_contact_invitation(self, pending_contact, block=True):
        def callback(memberships):
            pending_contact._set_memberships(memberships)
            self.emit('contact-rejected', pending_contact)
        di = scenario.DeclineInviteScenario(self._sharing,
                 (callback,),
                 (self.__common_errback,))
        di.account = pending_contact.account
        di.network = pending_contact.network_id
        di.memberships = pending_contact.memberships
        di.block = block
        di()

def decline_contact_invitation(self, pending_contact, block=True,
            done_cb=None, failed_cb=None):
        def callback(memberships):
            pending_contact._set_memberships(memberships)
            self.__common_callback('contact-rejected', done_cb, pending_contact)
        di = scenario.DeclineInviteScenario(self._sharing,
                 (callback,),
                 (self.__common_errback, failed_cb))
        di.account = pending_contact.account
        di.network = pending_contact.network_id
        di.memberships = pending_contact.memberships
        di.block = block
        di()

def decline_contact_invitation(self, pending_contact, block=True,
            done_cb=None, failed_cb=None):
        def callback(memberships):
            pending_contact._set_memberships(memberships)
            self.__common_callback('contact-rejected', done_cb, pending_contact)
        di = scenario.DeclineInviteScenario(self._sharing,
                 (callback,),
                 (self.__common_errback, failed_cb))
        di.account = pending_contact.account
        di.network = pending_contact.network_id
        di.memberships = pending_contact.memberships
        di.block = block
        di()

def decline_contact_invitation(self, pending_contact, block=True,
            done_cb=None, failed_cb=None):
        def callback(memberships):
            pending_contact._set_memberships(memberships)
            self.__common_callback('contact-rejected', done_cb, pending_contact)
        di = scenario.DeclineInviteScenario(self._sharing,
                 (callback,),
                 (self.__common_errback, failed_cb))
        di.account = pending_contact.account
        di.network = pending_contact.network_id
        di.memberships = pending_contact.memberships
        di.block = block
        di()