python - 如何用星号 ("*") 替换 csv 文件列中的非重复值？

Question

大家。我需要匿名the raw table制作 anonymized table 。换句话说，我需要用星号替换非重复的集合。

实际上，我已经运行了这段代码:

    for j in range(len(zz_new)):
        for i in range(len(zz)):
            if zz_new.iloc[j][0] != zz.iloc[i][0]:
                zz_new.iat[j,0]="*"

            if zz_new.iloc[j][1] != zz.iloc[i][1]:
                zz_new.iat[j,1]="*"

            if zz_new.iloc[j][2] != zz.iloc[i][2]:
                zz_new.iat[j,2]="*"

            if zz_new.iloc[j][3] != zz.iloc[i][3]:
                zz_new.iat[j,3]="*"

            if zz_new.iloc[j][4] != zz.iloc[i][4]:
                zz_new.iat[j,4]="*"

，但是结果是这样的My anonymized table 。我想知道您是否可以帮助我联系 anonymized table .

Answer 1

使用 value_counts() 方法:

df                                                                                                                   
     age  education
0  30-39    HS-grad
1  40-49  Bachelors
2  30-39    HS-grad
3  30-39       11th

vcnt= df.education.value_counts().eq(1)                                                                              

HS-grad      False
Bachelors     True
11th          True
Name: education, dtype: bool

df["education"]= df.education.replace(vcnt.loc[vcnt].index,"*")                                                      

     age education
0  30-39   HS-grad
1  40-49         *
2  30-39   HS-grad
3  30-39         *