tkinter window get x, y, geometry/coordinates without top of window

I am using tk in python (3), though I'd assume that this applies to any language. I am looking to get the current x, y coordinates of a tk window outside of the title bar:

import tkinter  
root = tkinter.Tk()

however, using root.winfo_y() gives me the coordinates including the depth of the titlebar. For a window that is in the upper left corner of my screen:

root.winfo_x(), root.winfo_y()          # returns (0, 22)

In other words, running:

root.geometry('+{}+{}'.format(root.winfo_x(), root.winfo_y()))

will move down the window by 22 pixels (the height of the title bar) every time I call it. How can I get the actual coordinates of the entire window?