在Python Tkinter GUI中使用DataFrame的多个动态OptionMenu -PY_VAR21错误

import tkinter as tk
from tkinter import ttk
import pandas as pd

window = tk.Tk()
window.title("使用DataFrame的多个动态OptionMenu")

data = {'Option1': ['A', 'B', 'C'],
        'Option2': ['X', 'Y', 'Z']}
df = pd.DataFrame(data)
options = df.columns.tolist()

def update_options(*args):
    selected_option = option_var.get()
    option_menu['menu'].delete(0, 'end')
    for option in df[selected_option]:
        option_menu['menu'].add_command(label=option, command=tk._setit(option_var, option))

option_var = tk.StringVar()
option_var.set(options[0])
option_menu = ttk.OptionMenu(window, option_var, *options, command=update_options)
option_menu.pack()

selected_label = tk.Label(window, textvariable=option_var)
selected_label.pack()

update_options()

window.mainloop()