How can I best center a Tkinter window on my display screen?

Not knowing Tkinter that well, here is a somewhat simple minded approach:

from Tkinter import *

def center_window(w=300, h=200):
    # get screen width and height
    ws = root.winfo_screenwidth()
    hs = root.winfo_screenheight()
    # calculate position x, y
    x = (ws/2) - (w/2)    
    y = (hs/2) - (h/2)
    root.geometry('%dx%d+%d+%d' % (w, h, x, y))

root = Tk() 
center_window(500, 300) 
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