Python ttk combobox值更新？

from tkinter import *
from tkinter import ttk

root = Tk()
combo = ttk.Combobox(root)

def update_values():
    new_values = ["Value 1", "Value 2", "Value 3"]
    combo['values'] = new_values

update_button = Button(root, text="Update Values", command=update_values)

combo.pack()
update_button.pack()

from tkinter import *
from tkinter import ttk

def update_values():
    new_values = ["Value 1", "Value 2", "Value 3"]
    combo['values'] = new_values

root = Tk()
combo = ttk.Combobox(root)

update_button = Button(root, text="Update Values", command=update_values)

combo.pack()
update_button.pack()

root.mainloop()