pythoncom.PumpMessages - how to quit

[abcd]

When I call:

pythoncom.PumpMessages()

...it blocks at that line.  According to the docs, it says it will run
until it receives a WM_QUIT....so I try to create a separate thread and
do

import win32api
win32api.PostQuitMessage()

...but the code is still blocking at PumpMessages.  Any ideas?  other
than killing python?

thanks