Simple clock using PyGTK and GObject.timeout_add()

clock.py

#!/usr/bin/python
from gi.repository import Gtk, GObject
from datetime import datetime

class MainWindow(Gtk.Window):
	def __init__(self):
		Gtk.Window.__init__(self, title="app")

		self.box = Gtk.Box(spacing=6)
		self.add(self.box)

		self.label = Gtk.Label()
		self.box.pack_start(self.label, True, True, 0)

	# Displays Timer
	def displayclock(self):
		#  putting our datetime into a var and setting our label to the result. 
		#  we need to return "True" to ensure the timer continues to run, otherwise it will only run once.
		datetimenow = str(datetime.now())
		self.label.set_label(datetimenow)
		return True

	# Initialize Timer
	def startclocktimer(self):
		#  this takes 2 args: (how often to update in millisec, the method to run)
		GObject.timeout_add(1000, self.displayclock)


win = MainWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
win.startclocktimer()
Gtk.main()