一次重构，让我处理DataFrame条件逻辑的速度提升了4倍。还记得那个周五的下午，我盯着屏幕上这段代码发呆：df["category"] = np.where(df["score"] > 90, "A", np.where(df["score"] ...

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Excel still trips over dates, ghost links, and undo history. These six fixes would save hours for everyday users.