Geometry option in Tk()

[Jeff Epler]

The caveats that you'll see in the 'winfo height' and 'winfo width' section
of winfo(n) also apply to 'wm geometry':
       winfo width window
              Returns a decimal string giving window's  width  in
              pixels.   When  a window is first created its width
              will be 1 pixel;   the  width  will  eventually  be
              changed  by  a geometry manager to fulfill the win­
              dow's needs.  If you need the  true  width  immedi­
              ately  after  creating  a  widget, invoke update to
              force the geometry manager to arrange  it,  or  use
              winfo  reqwidth to get the window's requested width
              instead of its actual width.

Jeff