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並前往https://itnext.io/a-guide-to-efficient-data-selection-in-pandas-ea6dab640604

A guide to efficient data selection in pandas

np.random.randint(1, 100, (1_000_000, 30)), columns=[f"col_{i}" for i in range(30)], ). Let's look what slicing vs. selecting a list of integers means ...

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