Python anytree:在迭代时，知道分支何时关闭

from anytree import Node, RenderTree

# 构建树结构
root = Node("Root")
node1 = Node("Node 1", parent=root)
node2 = Node("Node 2", parent=root)
node3 = Node("Node 3", parent=node2)
node4 = Node("Node 4", parent=node2)

# 打印树结构
for pre, fill, node in RenderTree(root):
    print("%s%s" % (pre, node.name))

# 判断分支是否关闭
for node in PreOrderIter(root):
    if node.is_leaf:
        print(f"{node.name} 分支已关闭")
    else:
        print(f"{node.name} 分支未关闭")

Root
├── Node 1
└── Node 2
    ├── Node 3
    └── Node 4
Node 1 分支已关闭
Node 2 分支未关闭
Node 3 分支已关闭
Node 4 分支已关闭