如何使用Python/Pandas从日期字段按月,日分组 [英] How can I Group By Month, Day from a Date field using Python/Pandas
本文介绍了如何使用Python/Pandas从日期字段按月,日分组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个数据帧df,如下所示:
I have a Data-frame df which is as follows:
| date | Revenue | Cost |
|-----------|---------|------|
| 6/1/2017 | 100 | 20 |
| 5/21/2017 | 200 | 40 |
| 5/21/2017 | 300 | 60 |
| 6/20/2017 | 400 | 80 |
| 6/1/2017 | 500 | 100 |
我需要将以上数据按月分组,然后按天分组,以得到如下输出:
I need to group the above data by Month and then by Day to get output as:
| Month | Day | SUM(Revenue) | SUM(Cost) |
|-------|-----|--------------|-----------|
| May | 21 | 500 | 100 |
| June | 1 | 600 | 120 |
| June | 20 | 400 | 80 |
我尝试了这段代码,但是没有用:
I tried this code but it did not work:
df.groupby(month('date'), day('date')).agg({'Revenue': 'sum', 'Cost': 'sum' })
我只想使用Pandas或Numpy,而没有其他库
I want to only use Pandas or Numpy and no additional libraries
推荐答案
让我们将set_index
和sum
与参数level
一起使用:
Let's use set_index
and sum
with argument level
:
df['date'] = pd.to_datetime(df['date'])
df['Month'] = df['date'].dt.strftime('%b')
df['Day'] = df['date'].dt.day
df.set_index(['Month','Day']).sum(level=[0,1]).reset_index()
输出:
Month Day Revenue Cost
0 Jun 1 600 120
1 Jun 20 400 80
2 May 21 500 100
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