组多索引 pandas 数据框 [英] group multi-index pandas dataframe
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问题描述
是否可以将多索引(2个级别)熊猫数据帧按多个索引级别之一分组?
Is it possible to groupby a multi-index (2 levels) pandas dataframe by one of the multi-index levels ?
我知道的唯一方法是在多索引上重置reset_index,然后再次设置索引.我相信有更好的方法可以做到,而且我想知道如何做.
The only way I know of doing it is to reset_index on a multiindex and then set index again. I am sure there is a better way to do it, and I want to know how.
推荐答案
是的,请使用level
参数.在此处看看.示例:
Yes, use the level
parameter. Take a look here. Example:
In [26]: s
first second third
bar doo one 0.404705
two 0.577046
baz bee one -1.715002
two -1.039268
foo bop one -0.370647
two -1.157892
qux bop one -1.344312
two 0.844885
dtype: float64
In [27]: s.groupby(level=['first','second']).sum()
first second
bar doo 0.981751
baz bee -2.754270
foo bop -1.528539
qux bop -0.499427
dtype: float64
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