retrieving the return code from a spawned thread.

[JY]

hi all,

       I would like to know how I can retrieve in my main thread (see
[A]) the
return code from a thread (see [B]) that I launched :

[B]
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")

[A] in the main thread:
.....
thrdExample = []
thrdExample.append(example(file))
.....

once thrdExample[i] is not active anymore, how can I test its return
code "rc" if the main thread ??

thanks in advance,
JY