from gi.repository import Gtk

class DialogExample(Gtk.Dialog):

def __init__(self, parent):

Gtk.Dialog.__init__(self, "My Dialog", parent, 0,

(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,

Gtk.STOCK_OK, Gtk.ResponseType.OK))

self.set_default_size(150, 100)

label = Gtk.Label("This is a dialog to display additional information")

box = self.get_content_area()

box.add(label)

self.show_all()

class DialogWindow(Gtk.Window):

def __init__(self):

Gtk.Window.__init__(self, title="Dialog Example")

self.set_border_width(6)

button = Gtk.Button("Open dialog")

button.connect("clicked", self.on_button_clicked)

self.add(button)

def on_button_clicked(self, widget):

dialog = DialogExample(self)

response = dialog.run()

if response == Gtk.ResponseType.OK:

print("The OK button was clicked")

elif response == Gtk.ResponseType.CANCEL:

print("The Cancel button was clicked")

dialog.destroy()

win = DialogWindow()

win.connect("delete-event", Gtk.main_quit)

win.show_all()

Gtk.main()