Series类似于一维数组
第一步需要导入模块
from pandas import Series, DataFrame
In [4]: obj = Series([4, 7, -5, 3])
In [5]: obj
Out[5]:
0 4
1 7
2 -5
3 3
In [6]: obj.values
Out[6]: array([ 4, 7, -5, 3])
In [7]: obj.index
Out[7]: Int64Index([0, 1, 2, 3])
指定索引
In [8]: obj2 = Series([4, 7, -5, 3], index=['d', 'b', 'a', 'c'])
In [9]: obj2
Out[9]:
d 4
b 7
a -5
c 3
In [10]: obj2.index
Out[10]: Index([d, b, a, c], dtype=object)
In [11]: obj2['a']
Out[11]: -5
In [12]: obj2['d'] = 6
In [13]: obj2[['c', 'a', 'd']]
Out[13]:
c 3
a -5
d 6
各种运算
过滤，乘法
In [14]: obj2
Out[14]:
d 6
b 7
a -5
c 3
In [15]: obj2[obj2 > 0] In [16]: obj2 * 2 In [17]: np.exp(obj2)
Out[15]: Out[16]: Out[17]:
d 6 d 12 d 403.428793
b 7 b 14 b 1096.633158
c 3 a -10 a 0.006738
c 6 c 20.085537
Series看做一个定长有序的字典
In [18]: 'b' in obj2
Out[18]: True
In [19]: 'e' in obj2
Out[19]: False
