How to use the blinker._utilities.reference function in blinker

:param sender: Any object or :obj:`ANY`, defaults to ``ANY``.
          Restricts notifications delivered to *receiver* to only those
          :meth:`send` emissions sent by *sender*.  If ``ANY``, the receiver
          will always be notified.  A *receiver* may be connected to
          multiple *sender* values on the same Signal through multiple calls
          to :meth:`connect`.

        :param weak: If true, the Signal will hold a weakref to *receiver*
          and automatically disconnect when *receiver* goes out of scope or
          is garbage collected.  Defaults to True.

        """
        receiver_id = hashable_identity(receiver)
        if weak:
            receiver_ref = reference(receiver, self._cleanup_receiver)
            receiver_ref.receiver_id = receiver_id
        else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:

:param sender: Any object or :obj:`ANY`, defaults to ``ANY``.
          Restricts notifications delivered to *receiver* to only those
          :meth:`send` emissions sent by *sender*.  If ``ANY``, the receiver
          will always be notified.  A *receiver* may be connected to
          multiple *sender* values on the same Signal through multiple calls
          to :meth:`connect`.

        :param weak: If true, the Signal will hold a weakref to *receiver*
          and automatically disconnect when *receiver* goes out of scope or
          is garbage collected.  Defaults to True.

        """
        receiver_id = hashable_identity(receiver)
        if weak:
            receiver_ref = reference(receiver, self._cleanup_receiver)
            receiver_ref.receiver_id = receiver_id
        else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:

else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:
                sender_ref = reference(sender, self._cleanup_sender)
                sender_ref.sender_id = sender_id
            except TypeError:
                pass
            else:
                self._weak_senders.setdefault(sender_id, sender_ref)
                del sender_ref

        # broadcast this connection.  if receivers raise, disconnect.
        if ('receiver_connected' in self.__dict__ and
            self.receiver_connected.receivers):
            try:
                self.receiver_connected.send(self,
                                             receiver=receiver,
                                             sender=sender,
                                             weak=weak)
            except:

:param sender: Any object or :obj:`ANY`, defaults to ``ANY``.
          Restricts notifications delivered to *receiver* to only those
          :meth:`send` emissions sent by *sender*.  If ``ANY``, the receiver
          will always be notified.  A *receiver* may be connected to
          multiple *sender* values on the same Signal through multiple calls
          to :meth:`connect`.

        :param weak: If true, the Signal will hold a weakref to *receiver*
          and automatically disconnect when *receiver* goes out of scope or
          is garbage collected.  Defaults to True.

        """
        receiver_id = hashable_identity(receiver)
        if weak:
            receiver_ref = reference(receiver, self._cleanup_receiver)
            receiver_ref.receiver_id = receiver_id
        else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:

else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:
                sender_ref = reference(sender, self._cleanup_sender)
                sender_ref.sender_id = sender_id
            except TypeError:
                pass
            else:
                self._weak_senders.setdefault(sender_id, sender_ref)
                del sender_ref

        # broadcast this connection.  if receivers raise, disconnect.
        if ('receiver_connected' in self.__dict__ and
            self.receiver_connected.receivers):
            try:
                self.receiver_connected.send(self,
                                             receiver=receiver,
                                             sender=sender,
                                             weak=weak)
            except:

else:
            receiver_ref = receiver
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)

        self.receivers.setdefault(receiver_id, receiver_ref)
        self._by_sender[sender_id].add(receiver_id)
        self._by_receiver[receiver_id].add(sender_id)
        del receiver_ref

        if sender is not ANY and sender_id not in self._weak_senders:
            # wire together a cleanup for weakref-able senders
            try:
                sender_ref = reference(sender, self._cleanup_sender)
                sender_ref.sender_id = sender_id
            except TypeError:
                pass
            else:
                self._weak_senders.setdefault(sender_id, sender_ref)
                del sender_ref

        # broadcast this connection.  if receivers raise, disconnect.
        if ('receiver_connected' in self.__dict__ and
            self.receiver_connected.receivers):
            try:
                self.receiver_connected.send(self,
                                             receiver=receiver,
                                             sender=sender,
                                             weak=weak)
            except: