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

def receivers_for(self, sender):
        """Iterate all live receivers listening for *sender*."""
        # TODO: test receivers_for(ANY)
        if self.receivers:
            sender_id = hashable_identity(sender)
            if sender_id in self._by_sender:
                ids = (self._by_sender[ANY_ID] |
                       self._by_sender[sender_id])
            else:
                ids = self._by_sender[ANY_ID].copy()
            for receiver_id in ids:
                receiver = self.receivers.get(receiver_id)
                if receiver is None:
                    continue
                if isinstance(receiver, WeakTypes):
                    strong = receiver()
                    if strong is None:
                        self._disconnect(receiver_id, ANY_ID)
                        continue
                    receiver = strong
                yield receiver

def disconnect(self, receiver, sender=ANY):
        """Disconnect *receiver* from this signal's events.

        :param receiver: a previously :meth:`connected` callable

        :param sender: a specific sender to disconnect from, or :obj:`ANY`
          to disconnect from all senders.  Defaults to ``ANY``.

        """
        if sender is ANY:
            sender_id = ANY_ID
        else:
            sender_id = hashable_identity(sender)
        receiver_id = hashable_identity(receiver)
        self._disconnect(receiver_id, sender_id)

        if ('receiver_disconnected' in self.__dict__ and
            self.receiver_disconnected.receivers):
            self.receiver_disconnected.send(self,
                                            receiver=receiver,
                                            sender=sender)

: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:
                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

`sender=` as a single positional argument and any \*\*kwargs that
          were provided to a call to :meth:`send`.

        :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:

`sender=` as a single positional argument and any \*\*kwargs that
          were provided to a call to :meth:`send`.

        :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:

: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:
                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

: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:
                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

: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:
                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

`sender=` as a single positional argument and any \*\*kwargs that
          were provided to a call to :meth:`send`.

        :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:

def has_receivers_for(self, sender):
        """True if there is probably a receiver for *sender*.

        Performs an optimistic check only.  Does not guarantee that all
        weakly referenced receivers are still alive.  See
        :meth:`receivers_for` for a stronger search.

        """
        if not self.receivers:
            return False
        if self._by_sender[ANY_ID]:
            return True
        if sender is ANY:
            return False
        return hashable_identity(sender) in self._by_sender