python3 wx.TreeCtrl -如何遍历多个级别

import wx

def traverse_tree(tree, item):
    # 获取当前节点的子节点
    child, cookie = tree.GetFirstChild(item)
    
    while child.IsOk():
        # 处理当前节点
        print(tree.GetItemText(child))
        
        # 递归遍历子节点的子节点
        traverse_tree(tree, child)
        
        # 获取下一个兄弟节点
        child, cookie = tree.GetNextChild(item, cookie)

app = wx.App()
frame = wx.Frame(None, title="TreeCtrl Example")
panel = wx.Panel(frame)

tree = wx.TreeCtrl(panel)
root = tree.AddRoot("Root")

# 添加一些示例节点
item1 = tree.AppendItem(root, "Item 1")
item2 = tree.AppendItem(root, "Item 2")
item3 = tree.AppendItem(root, "Item 3")

subitem1 = tree.AppendItem(item1, "Subitem 1")
subitem2 = tree.AppendItem(item1, "Subitem 2")

subsubitem1 = tree.AppendItem(subitem2, "Subsubitem 1")

# 遍历树形结构
traverse_tree(tree, root)

frame.Show()
app.MainLoop()