如何在每次新条目后更改组合的值- Tkinter

import tkinter as tk

def update_combobox():
    selected_item = combobox.get()
    new_value = selected_item + " updated"
    combobox.set(new_value)

root = tk.Tk()

# 创建一个Combobox
combobox = tk.ttk.Combobox(root)
combobox['values'] = ('Item 1', 'Item 2', 'Item 3')
combobox.pack()

# 创建一个按钮，点击后更新Combobox的值
update_button = tk.Button(root, text="Update", command=update_combobox)
update_button.pack()

root.mainloop()