“python tkinter entrybox”如何在entrybox中输入光标前获取字符串？

import tkinter as tk

def get_text():
    cursor_pos = entry.index(tk.INSERT)
    text_before_cursor = entry.get()[:cursor_pos]
    print(text_before_cursor)

root = tk.Tk()

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

button = tk.Button(root, text="Get Text", command=get_text)
button.pack()

root.mainloop()