如何突出显示文本中的某些单词Tk()

import tkinter as tk

def highlight_word(text_widget, word):
    text = text_widget.get("1.0", tk.END)
    text_widget.tag_remove("highlight", "1.0", tk.END)
    start = "1.0"
    while True:
        start = text.find(word, start)
        if start == -1:
            break
        end = f"{start}+{len(word)}c"
        text_widget.tag_add("highlight", start, end)
        start = end
    text_widget.tag_config("highlight", background="yellow")

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

text_widget.insert(tk.END, "这是一个使用Tk()创建的文本突出显示示例。Tk()是一个GUI库。")
highlight_word(text_widget, "Tk()")

root.mainloop()