在退出函数之前，FileChooserDialog不会关闭。- Python GTK

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

def on_button_clicked(button):
    dialog = Gtk.FileChooserDialog("Please choose a file", None,
        Gtk.FileChooserAction.OPEN,
        (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
         Gtk.STOCK_OPEN, Gtk.ResponseType.OK))

    response = dialog.run()
    if response == Gtk.ResponseType.OK:
        print("File selected: " + dialog.get_filename())

    dialog.destroy()

win = Gtk.Window()
button = Gtk.Button(label="Open File")
button.connect("clicked", on_button_clicked)
win.add(button)
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()