def stop_nodes(self):
    'Stop multiple bitcoind test nodes'
    for node in self.nodes:
        node.stop_node()
    for node in self.nodes:
        while (not node.is_node_stopped()):
            time.sleep(0.1)
Stop multiple bitcoind test nodes
def stop_nodes(self):
    
    for node in self.nodes:
        node.stop_node()
    for node in self.nodes:
        while (not node.is_node_stopped()):
            time.sleep(0.1)