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I need to run as many threads of class Observer as there are elements in list dirlist. When I run it python console it works all right. class Observer(Thread): def run(self): naptime = random.randint(1,10) print(self.name + ' starting, running for %ss.' % naptime) time.sleep(naptime) print(self.name + ' done') observers = {} for d in dirlist: observers[d] = Observer() observers[d].start() But when I try to do it from a Master thread which is supposed to spawn the Observer threads I get errors. class Master(Thread): def __init__(self, dirlist): self.dirlist = dirlist def run(self): observers = {} for d in dirlist: observers[d] = Observer() observers[d].start() while True: time.sleep(3600) master_thread = Master(dirlist) master_thread.start() The call to Master.start results in: RuntimeError: thread.__init__() not called This looks strange to me. I am unable to understand whats the difference between both cases. Can anybody figure out a solution to my problem ? Somehow following doesn't produce an error, and I don't understand why. class Master(Thread): def set(self, dirlist): self.dirlist = dirlist def run(self): observers = {} for d in dirlist: observers[d] = Observer() observers[d].start() while True: time.sleep(3600) master_thread = Master() master_thread.set(dirlist) master_thread.start()

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