Tkinter，如何根据复选框状态设置某些元素的状态

import tkinter as tk

window = tk.Tk()
checkbox = tk.Checkbutton(window, text="复选框")
checkbox.pack()

button = tk.Button(window, text="按钮")
button.pack()

entry = tk.Entry(window)
entry.pack()

def checkbox_state():
    if checkbox.instate(['selected']):
        # 设置按钮可用
        button.config(state=tk.NORMAL)
        # 设置文本框只读
        entry.config(state=tk.NORMAL)
    else:
        # 设置按钮禁用
        button.config(state=tk.DISABLED)
        # 设置文本框可写
        entry.config(state=tk.NORMAL)

checkbox.config(command=checkbox_state)