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I got an AttributeError: '_MainProcess' object has no attribute '_exiting' from a Python application. Unfortunately this code has to run Python 2.5 and therefore the processing module nowadays known as multiprocessing . What I was doing is to create a Process with a Queue and to put an item in the queue from the main process. Looking into the processing.queue code I can see that a feeder thread is started. This feeder thread will then check currentProcess()._exiting , but currentProcess() evaluates to a _MainProcess which does not have said attribute as can be seen in the processing.process module. How to solve this? Is it a bug in processing ? If yes, can I simply monkeypatch it using currentProcess()._exiting = False ? Minimal example: #!/usr/bin/python import processing import processing.queue class Worker(processing.Process): def __init__(self): processing.Process.__init__(self) self.queue = processing.queue.Queue() def run(self): element = self.queue.get() print element if __name__ == '__main__': w = Worker() w.start() # To trigger the problem, any non-pickleable object is to be passed here. w.queue.put(lambda x: 1) w.join()

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