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参考链接
Python 文本文件内容批量抽取:https://blog.csdn.net/qq_22885109/article/details/80819916
python实现根据指定字符截取对应的行的内容:https://blog.csdn.net/xqn2017/article/details/78206988
判断字符串是否为空::https://blog.csdn.net/qiqiaiairen/article/details/52623459