retrieving a return code from a thread

[Jean-Yves Nief]

hi all,

       I would like to know how I can retrieve in my main program the
return code from a thread that I launched:
class example(threading.Thread):

    def __init__(self, filename):
        self.filename = filename
        threading.Thread.__init__(self)
        self.start()

    def run(self):
         ........
         rc = os.system("command example")

in the main thread:
.....
thrdExample = []
thrdExample.append(example(file))
.....
# once it's not active anymore, test of the return code for
thrdExample[i] ??

thanks in advance,
JY