pandas 熊猫系列：更改索引顺序

pandas series: change order of index

提问by Anne

I have a Pandas series, for example like this

我有一个Pandas系列，例如这样

s = pandas.Series(data = [1,2,3], index = ['A', 'B', 'C'])

How can I change the order of the index, so that sbecomes

如何更改索引的顺序，使其s变为

B    2
A    1
C    3

I have tried

我试过了

s['B','A','C']

but that will give me a key error. (In this particular example I could presumably take care of the order of the index while constructing the series, but I would like to have a way to do this after the series has been created.)

但这会给我一个关键错误。（在这个特定示例中，我大概可以在构建系列时处理索引的顺序，但我希望在创建系列后有办法做到这一点。）

回答by EdChum

Use reindex:

使用reindex：

In [52]:

s = s.reindex(index = ['B','A','C'])
s
Out[52]:
B    2
A    1
C    3
dtype: int64