python gtk close on escape key

I wanted a gtk window to close when the escape key is pressed:

 
import pygtk
pygtk.require('2.0')
import gtk
 
class CloseOnEscape :
	def keypress(self, widget, event) :
		if event.keyval == gtk.keysyms.Escape :
			gtk.main_quit()
 
	def __init__(self):
		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
		self.window.connect("key-press-event", self.keypress)
		self.window.show()
 
	def main(self):
		gtk.main()
 
if __name__ == "__main__":
	app = CloseOnEscape()
	app.main()