问如何将tkinter文本小部件的插入光标移动到某个索引

EN

import tkinter as tk

def autocomplete(widget, first, last):
    # insert the two characters at the insertion point
    widget.insert("insert", first + last)

    # move insertion cursor back one character
    widget.mark_set("insert", "insert-1c")

    # prevent the text widget from inserting the character that
    # triggered the event since we've already inserted it.
    return "break"

root = tk.Tk()
text = tk.Text(root, wrap="word")
text.pack(fill="both", expand=True)

text.bind("(", lambda event: autocomplete(event.widget, "(", ")"))
text.bind("[", lambda event: autocomplete(event.widget, "[", "]"))

root.mainloop()