即将离开知乎
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https://stackoverflow.com/questions/1500718/how-to-override-the-copy-deepcopy-operations-for-a-python-object
您即将离开知乎,请注意您的帐号和财产安全。
https://stackoverflow.com/questions/1500718/how-to-override-the-copy-deepcopy-operations-for-a-python-object