1import multiprocessing, sys
2
3def foo():
4    print("123")
5
6# Because "if __name__ == '__main__'" is missing this will not work
7# correctly on Windows.  However, we should get a RuntimeError rather
8# than the Windows equivalent of a fork bomb.
9
10if len(sys.argv) > 1:
11    multiprocessing.set_start_method(sys.argv[1])
12else:
13    multiprocessing.set_start_method('spawn')
14
15p = multiprocessing.Process(target=foo)
16p.start()
17p.join()
18sys.exit(p.exitcode)
19