如何在python中替换n元树中的节点？

class Node:
    def __init__(self, value):
        self.value = value
        self.children = []

def replace_node(root, target_value, new_value):
    if root.value == target_value:
        root.value = new_value

    for child in root.children:
        replace_node(child, target_value, new_value)

# 示例用法
# 创建一个n元树
root = Node(1)
child1 = Node(2)
child2 = Node(3)
child3 = Node(4)
root.children = [child1, child2, child3]

# 替换节点值
replace_node(root, 2, 5)

# 输出替换后的树
print(root.value)  # 输出: 1
print(child1.value)  # 输出: 5
print(child2.value)  # 输出: 3
print(child3.value)  # 输出: 4