Python GTK Click Button

clicker.py

import gtk
import time

class ClickButtonApp(object):

    def __init__(self):
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.window.connect("destroy", self.quit)
        self.button = gtk.Button("When ready, click for 10 seconds.")
        self.button.connect("clicked", self.do_click)
        self.window.add(self.button)
        self.clicks = 0
        self.button.show()
        self.window.show()

    def do_click(self, widget, data=None):
        if self.clicks == 0:
            self.start_time = time.time()

        elapsed = time.time() - self.start_time

        if elapsed >= 10:
            cpm = self.clicks * 6
            msg = "Total clicks: %s. Per minute: %s. Per second: %s" % (
                        self.clicks,
                        cpm,
                        cpm / 60.0
                    )
            self.button.set_label( msg )
        else:
            self.clicks += 1
            self.button.set_label("%.2f seconds elapsed. # clicks: %s" % (
                elapsed, self.clicks))

    def quit(self, widget, data=None):
        gtk.main_quit()

    def main(self):
        """ Start the gtk event loop """
        gtk.main()

if __name__ == "__main__":
    s = ClickButtonApp()
    s.main()