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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