单击按钮时python Gtk3返回值

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

def on_button_clicked(button):
    # 在这里编写按钮单击时的操作
    return "Hello, World!"  # 返回一个字符串作为示例

def on_window_destroy(window):
    Gtk.main_quit()

def create_window():
    window = Gtk.Window()
    window.connect("destroy", on_window_destroy)

    button = Gtk.Button(label="Click Me")
    button.connect("clicked", on_button_clicked)
    window.add(button)

    window.show_all()

if __name__ == "__main__":
    create_window()
    Gtk.main()