如下所示：
import numpy as np
import pandas as pd
from pandas import Series,DataFrame
一、Series与Series
s1 = Series([1,3,5,7],index=['a','b','c','d'])
s2 = Series([2,4,6,8],index=['a','b','c','e'])
索引对齐项相加，不对齐项的值取NaN
s1+s2
1
a 3.0
b 7.0
c 11.0
d NaN
e NaN
dtype: float64
二、DataFrame与DataFrame
data1
