Problem remotely shutting down a windows computer with python

[EW]

I have a problem when using the python script found here:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/360649

It is a script to remotely shutdown a windows computer.  When I use it,
the computer shuts down, but doesn't power off like with a regular
shutdown. It stays on the "Safe to power off" screen and I have to push
the power button to actually power off.  Anyone know why this happens
with this script?  Thanks for any help.

Eric