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圖像來源，Dan McKenzie
，更多细节参见im钱包官方下载
Not all streaming workloads involve I/O. When your source is in-memory and your transforms are pure functions, async machinery adds overhead without benefit — you're paying for coordination of "waiting" that adds no benefit.。关于这个话题，Line官方版本下载提供了深入分析
self.file_exists = os.path.exists(csv_path)