You can do it before:
To place at a specific position:
if sys.platform == 'win32':
os.environ['SDL_VIDEO_WINDOW_POS'] = '3,23'
or, to center:
if sys.platform == 'win32' or sys.platform == 'win64':
os.environ['SDL_VIDEO_CENTERED'] = '1'
For some reason, it doesn't work for me--it worked when I had Python 2.4
I've got a somewhat unusual hardware configuration, so it should work for you.
Ian