import pygtk
import gtk

class WindowMain:
    def __init__(self):
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)

        self.button_close = gtk.Button("Pritisni me da se zaprem")
        self.button_close.connect("clicked", self.button_close_clicked)
        self.window.add(self.button_close)
        self.window.show_all()
    def main(self):
        gtk.main()
    def button_close_clicked(self, button):
        print "V tem trenutku bi se moral zapreti."

window_main = WindowMain()
window_main.main()