Cómo centrar la ventana en Tk (tkinter)

import tkinter as tk

def center_window(window):
    """
    Basado en https://stackoverflow.com/a/10018670.
    """
    window.update_idletasks()
    width = window.winfo_width()
    frm_width = window.winfo_rootx() - window.winfo_x()
    win_width = width + 2*frm_width
    height = window.winfo_height()
    titlebar_height = window.winfo_rooty() - window.winfo_y()
    win_height = height + titlebar_height + frm_width
    x = window.winfo_screenwidth()//2 - win_width//2
    y = window.winfo_screenheight()//2 - win_height//2
    window.geometry('{}x{}+{}+{}'.format(width, height, x, y))
    window.deiconify()

root = tk.Tk()
# Centrar la ventana.
center_window(root)
root.mainloop()