The logic is fairly simple: I don’t give a shit what you name your player object. I don’t care how deeply you bury it in a closure. I don’t care what class you instantiate it from. At some point, you have to call .play(). And when you do, I’ll be waiting.
双跑校验：分层验证确保业务平稳过渡，推荐阅读WPS官方版本下载获取更多信息
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self.file_exists = os.path.exists(csv_path)
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