t by *sender*.

        :param receiver: A callable.  Will be invoked by :meth:`send` with
          `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.

        r