如何基于熊猫数据框中的字符串选择行并对其进行子集化？

Question

我的数据集如下所示。我正在尝试对pandas数据帧进行子集化，以便仅选择所有3个人的回答。例如，在下面的数据框中，所有3个人回答的回答是“我喜欢吃”和“您今天过得愉快”。因此，只有那些应该被子集。我不确定如何在Pandas数据框中实现此目标。

注意：我是Python的新手，请提供您的代码说明。

DataFrame示例

import pandas as pd
data = {'Person':['1', '1','1','2','2','2','2','3','3'],'Response':['I like to eat','You have nice day','My name is ','I like to eat','You have nice day','My name is','This is it','I like to eat','You have nice day'],
      }
df = pd.DataFrame(data)
print (df)

输出：

  Person           Response
0      1      I like to eat
1      1  You have nice day
2      1        My name is 
3      2      I like to eat
4      2  You have nice day
5      2         My name is
6      2         This is it
7      3      I like to eat
8      3  You have nice day

Answer 1

IIUC我正在将transform与nunique一起使用

yourdf=df[df.groupby('Response').Person.transform('nunique')==df.Person.nunique()]
yourdf
Out[463]: 
  Person           Response
0      1      I like to eat
1      1  You have nice day
3      2      I like to eat
4      2  You have nice day
7      3      I like to eat
8      3  You have nice day

---

方法2

df.groupby('Response').filter(lambda x : pd.Series(df['Person'].unique()).isin(x['Person']).all())
Out[467]: 
  Person           Response
0      1      I like to eat
1      1  You have nice day
3      2      I like to eat
4      2  You have nice day
7      3      I like to eat
8      3  You have nice day