from gi.repository import Gtk

import sys

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="RadioButton Example", application=app)

        self.set_default_size(250, 100)

        self.set_border_width(20)

        # a new radiobutton with a label

        button1 = Gtk.RadioButton(label="Button 1")

        # connect the signal "toggled" emitted by the radiobutton

        # with the callback function toggled_cb

        button1.connect("toggled", self.toggled_cb)

        # another radiobutton, in the same group as button1

        button2 = Gtk.RadioButton.new_from_widget(button1)

        # with label "Button 2"

        button2.set_label("Button 2")

        # connect the signal "toggled" emitted by the radiobutton

        # with the callback function toggled_cb

        button2.connect("toggled", self.toggled_cb)

        # set button2 not active by default

        button2.set_active(False)

        # another radiobutton, in the same group as button1,

        # with label "Button 3"

        button3 = Gtk.RadioButton.new_with_label_from_widget(

            button1, "Button 3")

        # connect the signal "toggled" emitted by the radiobutton

        # with the callback function toggled_cb

        button3.connect("toggled", self.toggled_cb)

        # set button3 not active by default

        button3.set_active(False)

        # a grid to place the buttons

        grid = Gtk.Grid.new()

        grid.attach(button1, 0, 0, 1, 1)

        grid.attach(button2, 0, 1, 1, 1)

        grid.attach(button3, 0, 2, 1, 1)

        # add the grid to the window

        self.add(grid)

    # callback function

    def toggled_cb(self, button):

        # a string to describe the state of the button

        state = "unknown"

        # whenever the button is turned on, state is on

        if button.get_active():

            state = "on"

        # else state is off

        else:

            state = "off"

        # whenever the function is called (a button is turned on or off)

        # print on the terminal which button was turned on/off

        print(button.get_label() + " was turned " + state)

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def do_startup(self):

        Gtk.Application.do_startup(self)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)