mixin.py 文件源码

def dm_teardown(self):
        """ Disconnect the method from the signal.
        It's done to avoid conflicts when many instances of the mixin are being executed.

        """
        try:
            dispatcher.disconnect(
                self.dequeue_next_page_requests,
                signal=signals.spider_idle
            )
        except DispatcherKeyError:
            pass