Console printing

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Why does the following program only prints the output (in the run
method) when the while loop terminates? Please note that this is
running in a thread. I though a sleep() is supposed to allow time for
console to update itself. I am using Pythonwin.

import threading
import time
import sys

class wasteTime(threading.Thread):

    def run(self):    
        # run forever
        self.running=1
        while self.running:
            print time.time()
            time.sleep(1)

    def stop(self):
        self.running=0

th=wasteTime()

print "Start thread"
startTime=time.time()
th.start()
while time.time()<startTime+5:
    time.sleep(1)

# I want to kill the th thread right here.
th.stop()
print "Finished Thread"
sys.exit()

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