How to use the blinker.base.Signal function in blinker

:argument: the Signal that was connected to
:keyword receiver_arg: the connected receiver
:keyword sender_arg: the sender to connect to
:keyword weak_arg: true if the connection to receiver_arg is a weak reference

.. deprecated:: 1.2

As of 1.2, individual signals have their own private
:attr:`~Signal.receiver_connected` and
:attr:`~Signal.receiver_disconnected` signals with a slightly simplified
call signature.  This global signal is planned to be removed in 1.6.

""")


class NamedSignal(Signal):
    """A named generic notification emitter."""

    def __init__(self, name, doc=None):
        Signal.__init__(self, doc)

        #: The name of this signal.
        self.name = name

    def __repr__(self):
        base = Signal.__repr__(self)
        return "%s; %r>" % (base[:-1], self.name)


class Namespace(dict):
    """A mapping of signal names to signals."""

failure mode is perhaps not a big deal for you.
        """
        for mapping in (self._by_sender, self._by_receiver):
            for _id, bucket in list(mapping.items()):
                if not bucket:
                    mapping.pop(_id, None)

    def _clear_state(self):
        """Throw away all signal state.  Useful for unit tests."""
        self._weak_senders.clear()
        self.receivers.clear()
        self._by_sender.clear()
        self._by_receiver.clear()


receiver_connected = Signal("""\
Sent by a :class:`Signal` after a receiver connects.

:argument: the Signal that was connected to
:keyword receiver_arg: the connected receiver
:keyword sender_arg: the sender to connect to
:keyword weak_arg: true if the connection to receiver_arg is a weak reference

.. deprecated:: 1.2

As of 1.2, individual signals have their own private
:attr:`~Signal.receiver_connected` and
:attr:`~Signal.receiver_disconnected` signals with a slightly simplified
call signature.  This global signal is planned to be removed in 1.6.

""")

def receiver_connected(self):
        """Emitted after each :meth:`connect`.

        The signal sender is the signal instance, and the :meth:`connect`
        arguments are passed through: *receiver*, *sender*, and *weak*.

        .. versionadded:: 1.2

        """
        return Signal(doc="Emitted after a receiver connects.")

Note, this signal is emitted **only** when :meth:`disconnect` is
        called explicitly.

        The disconnect signal can not be emitted by an automatic disconnect
        (due to a weakly referenced receiver or sender going out of scope),
        as the receiver and/or sender instances are no longer available for
        use at the time this signal would be emitted.

        An alternative approach is available by subscribing to
        :attr:`receiver_connected` and setting up a custom weakref cleanup
        callback on weak receivers and senders.

        .. versionadded:: 1.2

        """
        return Signal(doc="Emitted after a receiver disconnects.")

def __init__(self, name, doc=None):
        Signal.__init__(self, doc)

        #: The name of this signal.
        self.name = name

def __repr__(self):
        base = Signal.__repr__(self)
        return "%s; %r>" % (base[:-1], self.name)