如何在tkinter中的复选按钮上使用'if‘。(python 3.8)

import tkinter as tk

root = tk.Tk()

selected = tk.BooleanVar()

checkbox = tk.Checkbutton(root, text="选项", variable=selected)

def handle_checkbox():
    if selected.get():
        print("复选按钮被选中")
    else:
        print("复选按钮未被选中")

button = tk.Button(root, text="检查状态", command=handle_checkbox)

checkbox.pack()
button.pack()

root.mainloop()