如何在打印时更改树状图中的变量？

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

# 构建树状图
root = Node("Root")
child1 = Node("Child 1")
child2 = Node("Child 2")
child3 = Node("Child 3")

root.children.append(child1)
root.children.append(child2)
root.children.append(child3)

# 打印树状图
def print_tree(node, level=0):
    indent = ' ' * level * 4
    print(f"{indent}{node.value}")
    for child in node.children:
        print_tree(child, level + 1)

print_tree(root)

# 更改变量值
child1.value = "Updated Child 1"

# 打印更新后的树状图
print_tree(root)