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

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'])
 print s1 + s2

a 11
b 22
c 33
d 44
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'])
 print s1 + s2

a 31
b 12
c 43
d 24
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'])
 print s1 + s2

a NaN
b NaN
c 13.0
d 24.0
e NaN
f NaN
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'])
 print s1 + s2

a NaN
b NaN
c NaN
d NaN
e NaN
f NaN
g NaN
h NaN
dtype: float64

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