pandas Series是近似于数组的一维结构
//input
import pandas as pd
s1 = pd.Series([1,2,3,4])
s1
//output
0 1
1 2
2 3
3 4
dtype: int64
//input
import pandas as pd
s2=pd.Series([1,2,3,4],index = ['a','b','c','d'])
s2
//output
a 1
b 2
c 3
d 4
dtype: int64
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