删除groupby中不包含元素的组（Python Pandas）

Question

让数据框如下所示：

import pandas as pd

df = pd.DataFrame({"name":["A", "A", "B" ,"B", "C", "C"],
                   "nickname":["X","Y","X","Z","Y", "Y"]}

如何对df进行分组并删除那些不包含至少一个“X”的组（C）？

谢谢

Answer 1

您可以使用pandas中的df.groupby('name').filter(lambda g: any(g.nickname == 'X')) # name nickname # 0 A X # 1 A Y # 2 B X # 3 B Z 分组：

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