Keyboard shortcuts in PyGTK

gistfile1.py

self._window.connect("key-press-event",self._key_press_event)

def _key_press_event(self,widget,event):
	keyval = event.keyval
	keyval_name = gtk.gdk.keyval_name(keyval)
	state = event.state
	ctrl = (state & gtk.gdk.CONTROL_MASK)
	if ctrl and keyval_name == 's':
		self._notewindow.save()
	elif ctrl and keyval_name == 'l':
		self._searchwidget.grab_focus()
	elif ctrl and keyval_name == 'j':
		self._notestorewindow.next()
	elif ctrl and keyval_name == 'k':
		self._notestorewindow.prev()
	elif keyval_name == "Escape":
		self._searchwidget.clear()
	else:
		return False
	return True

thx

ctrl = (state & gtk.gdk.CONTROL_MASK)
This seems to check if ctrl is included in the modifier keys pressed but it doesn't check if other modifiers were also pressed.
I.e. If Ctrl + Alt were pressed, along with s, the save window would also appear.