pandas 将索引值相加的方法
如下所示：
s1=pd.Series([1,2,3,4],index=['a','b','c','d']) s2=pd.Series([10,20,30,40],index=['a','b','c','d']) prints1+s2
a11 b22 c33 d44 dtype:int64
s1=pd.Series([1,2,3,4],index=['a','b','c','d']) s2=pd.Series([10,20,30,40],index=['b','d','a','c']) prints1+s2
a31 b12 c43 d24 dtype:int64
s1=pd.Series([1,2,3,4],index=['a','b','c','d']) s2=pd.Series([10,20,30,40],index=['c','d','e','f']) prints1+s2
aNaN bNaN c13.0 d24.0 eNaN fNaN dtype:float64
s1=pd.Series([1,2,3,4],index=['a','b','c','d']) s2=pd.Series([10,20,30,40],index=['e','f','g','h']) prints1+s2
aNaN bNaN cNaN dNaN eNaN fNaN gNaN hNaN dtype:float64
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