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import multiprocessing, sys
def foo():
print("123")
# Because "if __name__ == '__main__'" is missing this will not work
# correctly on Windows. However, we should get a RuntimeError rather
# than the Windows equivalent of a fork bomb.
if len(sys.argv) > 1:
multiprocessing.set_start_method(sys.argv[1])
else:
multiprocessing.set_start_method('spawn')
p = multiprocessing.Process(target=foo)
p.start()
p.join()
sys.exit(p.exitcode)
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