Pandas —— 惟一值unique( )，计数值value_counts( )及成员资格isin( )

惟一值 In [141]: obj=pd.Series(['c','a','d','a','a','b','b','c','c','c']) In [142]: obj.unique() Out[142]: array(['c', 'a', 'd', 'b'], dtype=object) 计数值 In [143]: obj.value_counts() Out[143]: c 4 a

>>阅读原文<<