def stop_all(self):
        """
        Stop all nodes
        """
        pool = Pool(concurrency=3)
        for node in self.nodes.values():
            pool.append(node.stop)
        yield from pool.join()
def stop_all ( self ) : pool = Pool ( concurrency = 3 ) for node in self . nodes . values ( ) : pool . append ( node . stop ) yield from pool . join ( )
Stop all nodes