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📅  最后修改于: 2022-03-11 14:46:34.475000             🧑  作者: Mango
>>> index = pd.Index([3, 1, 2, 3, 4, np.nan]) >>> index.value_counts() 3.0 2 2.0 1 4.0 1 1.0 1 dtype: int64