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Message: [QUOTE="JY, post: 1751561"] 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[/i][/B][/B] [/QUOTE]