如何在tkinter中将多个项目从一个列表框移动到另一个列表框？

import tkinter as tk

def move_to_target():
    selected_items = listbox_source.curselection()
    for index in selected_items[::-1]:
        item = listbox_source.get(index)
        listbox_target.insert(tk.END, item)
        listbox_source.delete(index)

def move_to_source():
    selected_items = listbox_target.curselection()
    for index in selected_items[::-1]:
        item = listbox_target.get(index)
        listbox_source.insert(tk.END, item)
        listbox_target.delete(index)

root = tk.Tk()

listbox_source = tk.Listbox(root, selectmode=tk.MULTIPLE)
listbox_source.pack(side=tk.LEFT)

listbox_target = tk.Listbox(root, selectmode=tk.MULTIPLE)
listbox_target.pack(side=tk.RIGHT)

button_to_target = tk.Button(root, text=">>", command=move_to_target)
button_to_target.pack()

button_to_source = tk.Button(root, text="<<", command=move_to_source)
button_to_source.pack()

items = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
for item in items:
    listbox_source.insert(tk.END, item)

root.mainloop()