如何在图的不同部分多次添加同一节点

class Node:
    def __init__(self, id, properties):
        self.id = id
        self.properties = properties

class Graph:
    def __init__(self):
        self.adjacency_list = {}

    def add_node(self, node):
        if node.id not in self.adjacency_list:
            self.adjacency_list[node.id] = node

    def add_edge(self, node1_id, node2_id):
        if node1_id in self.adjacency_list and node2_id in self.adjacency_list:
            node1 = self.adjacency_list[node1_id]
            node2 = self.adjacency_list[node2_id]
            # Add code to establish connection between nodes

# 创建图对象
graph = Graph()

# 创建节点对象
node1 = Node(1, {'property1': 'value1'})
node2 = Node(2, {'property2': 'value2'})

# 添加节点到图的不同部分
graph.add_node(node1)
graph.add_node(node2)

# 连接节点
graph.add_edge(1, 2)

# 多次添加同一节点
node3 = Node(1, {'property3': 'value3'})
graph.add_node(node3)