groupby之后的使用条件

我有一个熊猫dataframe df

import pandas

df = pandas.DataFrame(
    data=[["A", "Man"], ["A", "Woman"], ["A", "Man"], ["A", "Man"], ["B", "Woman"]],
    columns=["category", "gender"],
)

df
  category gender
0        A    Man
1        A  Woman
2        A    Man
3        A    Man
4        B  Woman

我数了一下每个类别里有多少男人和女人

grouped = df.groupby(by=["category", "gender"])["gender"].count()

grouped
category  gender
A         Man       3
          Woman     1
B         Woman     1
Name: gender, dtype: int64

我怎样才能得到一个男人和女人都多于1的类别列表?

category_list = [A]

问题来源StackOverflow 地址：/questions/59382662/use-conditions-after-groupby