如何从选定的Tkinter单选按钮获取文本标签？

import tkinter as tk

window = tk.Tk()

var = tk.StringVar()  # 创建一个变量，用于存储选中的单选按钮的值

radio_btn1 = tk.Radiobutton(window, text="选项1", variable=var, value="选项1的值")
radio_btn2 = tk.Radiobutton(window, text="选项2", variable=var, value="选项2的值")

radio_btn1.pack()
radio_btn2.pack()

selected_label = var.get()

import tkinter as tk

def get_selected_label():
    selected_label = var.get()
    print("选中的标签为:", selected_label)

window = tk.Tk()

var = tk.StringVar()

radio_btn1 = tk.Radiobutton(window, text="选项1", variable=var, value="选项1的值")
radio_btn2 = tk.Radiobutton(window, text="选项2", variable=var, value="选项2的值")

radio_btn1.pack()
radio_btn2.pack()

button = tk.Button(window, text="获取选中的标签", command=get_selected_label)
button.pack()

window.mainloop()