python - while loop specified time frame

import time

def looper(timeCount):
   start = time.time()
   keepLooping = True
   while keepLooping:
       if time.time()-start > timeCount:
           keepLooping = False
       else:
           print time.time()-start
       time.sleep(0.1)



if __name__ == '__main__':
       looper(10.0)