def disconnect_all(self, signal, **kwargs):
        """
        Disconnect all receivers from the given signal.

        :param signal: the signal to disconnect from
        :type signal: object
        """
        kwargs.setdefault('sender', self.sender)
        return _signal.disconnect_all(signal, **kwargs)

        Disconnect all receivers from the given signal.

        :param signal: the signal to disconnect from
        :type signal: object
        
stackoverflow/venv/lib/python3.6/site-packages/scrapy/signalmanager.py