Pandas---汇总和频数统计

  单变量频数统计&多变量分组统计中的相关方法～html 1. count&unique&nunique import pandas as pd test_data = pd.DataFrame({ 'x1': ["a", "b", "c", "b"], "x2": [1, 2, 3, 4], "x3": [4, 3, 2, 1] }) test_data x1 x2 x3

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