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 11b 22c 33d 44dtype: 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 31b 12c 43d 24dtype: 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  NaNb  NaNc 13.0d 24.0e  NaNf  NaNdtype: 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 NaNb NaNc NaNd NaNe NaNf NaNg NaNh NaNdtype: float64

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