PyQt: Center main window on screen

from PyQt4.QtGui import *
from PyQt4.QtCore import *

## This would go in some a function after the window is created
##   Perhaps using a one-shot-timer at the end of the windows __init__()
##        ex: QTimer.singleShot(0, self.centerWindow)

# screen geometry
screen = QDesktopWidget().screenGeometry()

# mainwindow geometry
appsize = self.geometry()

# horizontal center
hpos = (screen.width() - appsize.width()) / 2

# vertical center
vpos = (screen.height() - appsize.height()) / 2

# move main window to center
self.move(hpos,  vpos)