When is a thread garbage collected?

[Kent Johnson]

If I create and start a thread without keeping a reference to the thread, when is the thread garbage 
collected?

What I would like is for the thread to run to completion, then be GCed. I can't find anything in the 
docs that specifies this behavior; nor can I think of any other behaviour that seems reasonable :-)

For example with this code:
def genpassenger(num):
    for i in range(num):
        passenger().start()
class passenger(threading.Thread):
        def run:
            #do something
will all the passenger threads run to completion, then be GCed?
Thanks,
Kent
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