Python+tkinter实现树形图绘制

import tkinter as tk
from tkinter import ttk
dct = {
    "中国" : ["北京", "台北", "香港"],
    "美国" : ["纽约", "华盛顿"],
    "日本" : ["东京", "大阪"]
}
win = tk.Tk() # 设置窗口大小
# 此为根节点
tree = ttk.Treeview(win, show = "tree")
for key in dct:
    father = tree.insert("", 0, key, text=key)
    for v in dct[key]:
        tree.insert(father, 1, v, 
            text=v, values=(f"{key}-{v}"))
tree.pack(side=tk.LEFT, expand = True, fill = tk.BOTH)
win.mainloop()

def slct(evt):
    for item in tree.selection():
        print(tree.item(item, "values"))
def open_(evt):
    for item in tree.selection():
        print(f"{item} has opened")
def close(evt):
    for item in tree.selection():
        print(f"{item} has closed")
tree.bind('<<TreeviewSelect>>', slct)
tree.bind('<<TreeviewOpen>>', open_)
tree.bind('<<TreeviewClose>>', close)

scroll = ttk.Scrollbar(win)
scroll.config(command=tree.yview)
scroll.pack(side=tk.RIGHT, fill=tk.Y)
# 给treeview添加配置
tree.configure(yscrollcommand=scroll.set)