从按钮的命令调用的函数中的Tkinter Toplevel()使变量不可访问

import tkinter as tk

def open_window():
    data = "This is a secret"
    top = tk.Toplevel()
    # 在这里使用data变量进行操作

root = tk.Tk()
button = tk.Button(root, text="Open Window", command=open_window)
button.pack()
root.mainloop()

import tkinter as tk

def open_window(data):
    top = tk.Toplevel()
    # 在这里使用data变量进行操作

root = tk.Tk()
button = tk.Button(root, text="Open Window", command=lambda: open_window("This is a secret"))
button.pack()
root.mainloop()