我只想创建一个带有两个选项的Tkinter单选按钮:一次单击=选择另一次单击=取消选择。我该怎么做呢？

import tkinter as tk

window = tk.Tk()

selected_option = tk.StringVar()

option1 = tk.Radiobutton(window, text="选项1", variable=selected_option, value="选项1")
option2 = tk.Radiobutton(window, text="选项2", variable=selected_option, value="选项2")

def update_option():
    if selected_option.get() == "选项1":
        selected_option.set("选项2")
    else:
        selected_option.set("选项1")

option1.config(command=update_option)
option2.config(command=update_option)

option1.pack()
option2.pack()

window.mainloop()