You can register and de-register event listeners using the same argument types.... I would have thought you could do the same with keystroke listeners. See sample and traceback below if you thought so as well. ;)

~~~~~~~~~~~~~~~~

import pyatspi

def onKey(event):
    print "onKey: %s" % event

masks = range(0,256)
pyatspi.Registry.registerKeystrokeListener(onKey, mask=masks)
pyatspi.Registry.deregisterKeystrokeListener(onKey, mask=masks)
pyatspi.Registry.start()

~~~~~~~~~~~~~~~~

Traceback (most recent call last):

+ Trace 229341