def pubsub_channels(self, pattern=None):
        """Lists the currently active channels."""
        args = [b'PUBSUB', b'CHANNELS']
        if pattern is not None:
            args.append(pattern)
        return self.execute(*args)
def pubsub_channels ( self , pattern = None ) : args = [ b'PUBSUB' , b'CHANNELS' ] if pattern is not None : args . append ( pattern ) return self . execute ( * args )
Lists the currently active channels.