当tkinter文本控件改变时，如何获取回调？

import tkinter as tk

def on_text_change(*args):
    print("Text has changed to:", text_var.get())

root = tk.Tk()

text_var = tk.StringVar()
text_var.trace_add("write", on_text_change)  # "write"是触发回调的事件类型

entry = tk.Entry(root, textvariable=text_var)
entry.pack()

root.mainloop()

import tkinter as tk

def on_text_change(event):
    print("Text has changed")

root = tk.Tk()

text_widget = tk.Text(root)
text_widget.pack()

text_widget.bind("<<Modified>>", on_text_change)

root.mainloop()