如何在一个按钮的观察事件中使用另一个按钮的观察事件中定义的数据帧？

import tkinter as tk

def button1_click():
    # 获取button2的数据帧
    data_frame = button2.data_frame
    
    # 在button1的观察事件处理函数中使用数据帧
    # 进行相应的操作
    print(data_frame)

def button2_click():
    # 定义button2的数据帧
    button2.data_frame = "Hello, World!"

# 创建主窗口
window = tk.Tk()

# 创建按钮1
button1 = tk.Button(window, text="Button 1", command=button1_click)
button1.pack()

# 创建按钮2
button2 = tk.Button(window, text="Button 2", command=button2_click)
button2.pack()

# 运行主循环
window.mainloop()