Pandas DataFrame:如何通过多值列将一行分成多行? [英] Pandas dataframe: how do I split one row into multiple rows by multi-value column?

问题描述

我有一个如下所示的数据框:

I have a dataframe that appears as follows:

   issue_key date     pkey          component              case_count
0  1060  2018-03-08  PROJ  console,configuration,management    8   
1  1464  2018-04-24  PROJ2 protocol                            1   
2  611   2017-03-31  PROJ  None                                2
3  2057  2018-10-30  PROJ  ha, console                         0

我需要将组件列中具有多个值的行拆分为每个组件一行.

I need to split the rows with multiple values in the component column into one row per component.

完成后，数据框应如下所示:

When done, the dataframe should appear as follows:

   issue_key date     pkey          component              case_count
0  1060  2018-03-08  PROJ  console                           8
1  1060  2018-03-08  PROJ  configuration                     8
2  1060  2018-03-08  PROJ  management                        8   
3  1464  2018-04-24  PROJ2 protocol                          1   
4  611   2017-03-31  PROJ  None                              2
5  2057  2018-10-30  PROJ  ha                                0
6  2057  2018-10-30  PROJ  console                           0

关于如何最好地做到这一点的任何建议?

Any suggestions on how best to do this?

推荐答案

假设dd是您的数据帧.您可以这样做:

Let's say dd is your data frame. You can do:

# convert to list
dd['component'] = dd['component'].str.split(',')

# convert list of pd.Series then stack it
dd = (dd
 .set_index(['issue_key','date','pkey','case_count'])['component']
 .apply(pd.Series)
 .stack()
 .reset_index()
 .drop('level_4', axis=1)
 .rename(columns={0:'component'}))

       issue_key        date   pkey  case_count      component
0       1060  2018-03-08   PROJ           8        console
1       1060  2018-03-08   PROJ           8  configuration
2       1060  2018-03-08   PROJ           8     management
3       1464  2018-04-24  PROJ2           1       protocol
4        611  2017-03-31   PROJ           2           None
5       2057  2018-10-30   PROJ           0             ha
6       2057  2018-10-30   PROJ           0        console

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