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import gevent #import socket # on windows # iwait should not raise `LoopExit: This operation would block forever` # or `AssertionError: Invalid switch into ...` # if the caller of iwait causes greenlets to switch in between # return values def worker(i): # Have one of them raise an exception to test that case if i == 2: raise ValueError(i) return i def main(): finished = 0 # Wait on a group that includes one that will already be # done, plus some that will finish as we watch done_worker = gevent.spawn(worker, "done") gevent.joinall((done_worker,)) workers = [gevent.spawn(worker, i) for i in range(3)] workers.append(done_worker) for _ in gevent.iwait(workers): finished += 1 # Simulate doing something that causes greenlets to switch; # a non-zero timeout is crucial gevent.sleep(0.01) assert finished == 4 if __name__ == '__main__': main()