对pandas里的loc并列条件索引的实例讲解

如下所示：

def Family_feature(df):
 df['Fam_Size'] =df['SibSp']+df['Parch']
 df['Fam_Size'].loc[df['Fam_Size'] == 0] = 1
 df['Fam_Size'].loc[(df['Fam_Size'] > 1) & (df['Fam_Size'] <= 3)] = 2
#  df['Fam_Size'].loc[df['Fam_Size'] == 2] = 2
#  df['Fam_Size'].loc[df['Fam_Size'] == 3] = 2
 df['Fam_Size'].loc[df['Fam_Size'] > 3] = 3
 return df

df['Fam_Size'].loc[(df['Fam_Size'] > 1) & (df['Fam_Size'] <= 3)] = 2 只要中间加一个 & 符号 ， 然后把两边的condition括号起来就行。