Tkinter treeview -展开所有子节点

import tkinter as tk
from tkinter import ttk

def expand_all(tree):
    for item in tree.get_children():
        tree.item(item, open=True)
        expand_all(tree)

root = tk.Tk()

tree = ttk.Treeview(root)
tree.pack()

# 添加一些节点
tree.insert("", "end", text="节点1")
tree.insert("", "end", text="节点2")
tree.insert("", "end", text="节点3")

# 添加一些子节点
tree.insert("节点1", "end", text="子节点1")
tree.insert("节点1", "end", text="子节点2")
tree.insert("节点2", "end", text="子节点3")
tree.insert("节点2", "end", text="子节点4")

# 展开所有子节点
expand_all(tree)

root.mainloop()