Button

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from gi.repository import Gtk
import sys

class MyWindow(Gtk.ApplicationWindow):
    # a window
    def __init__(self, app):
        Gtk.Window.__init__(self, title="GNOME Button", application=app)
        self.set_default_size(250, 50)

        # a button
        button = Gtk.Button()
        # with a label
        button.set_label("Click me")
        # connect the signal "clicked" emitted by the button
        # to the callback function do_clicked
        button.connect("clicked", self.do_clicked)
        # add the button to the window
        self.add(button)

    # callback function connected to the signal "clicked" of the button
    def do_clicked(self, button):
        print "You clicked me!"

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)