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。

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