为什么multiprocessing的Process类必须要在if __name__="__main__"下调用，否则报错？这种情况只在Windows中存在，无法理解网上的解释

Since Windows has no fork, the multiprocessing module starts a new Python process and imports the calling module. If Process() gets called upon import, then this sets off an infinite succession of new processes (or until your machine runs out of resources). This is the reason for hiding calls to Process() insideif name == "__main__"since statements inside this if-statement will not get called upon import.
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