如何在Tkinter中显示框架内的选项菜单？

import tkinter as tk

def on_option_selected(event):
    selected_option = variable.get()
    print("Selected option:", selected_option)

root = tk.Tk()
frame = tk.Frame(root)

options = ["Option 1", "Option 2", "Option 3"]
variable = tk.StringVar(frame)
variable.set(options[0])  # 设置默认选项

option_menu = tk.OptionMenu(frame, variable, *options)
option_menu.pack()

variable.trace("w", on_option_selected)  # 监听选项变化

frame.pack()
root.mainloop()