我有以下数据帧:
| start_time | end_time | id |
|---------------------|---------------------|-----|
| 2017-03-30 01:00:00 | 2017-03-30 01:15:30 |1 |
| 2017-03-30 02:02:00 | 2017-03-30 03:30:00 |4 |
| 2017-03-30 03:37:00 | 2017-03-30 03:39:00 |7 |
| 2017-03-30 03:41:30 | 2017-03-30 04:50:00 |8 |
| 2017-03-30 07:10:00 | 2017-03-30 07:10:30 |10 |
| 2017-03-30 07:11:00 | 2017-03-30 07:20:00 |13 |
| 2017-03-30 07:22:00 | 2017-03-30 08:00:00 |15 |
| 2017-03-30 10:00:00 | 2017-03-30 10:03:00 |20 |
当行“I-1”的完成时间最多比行“I”的开始时间早900秒时,我想将同一id下的行分组。
基本上,上述示例的输出是:
结果是:
| start_time | end_time | id |
|---------------------|---------------------|-----|
| 2017-03-30 01:00:00 | 2017-03-30 01:15:30 |1 |
| 2017-03-30 02:02:00 | 2017-03-30 03:30:00 |4 |
| 2017-03-30 03:37:00 | 2017-03-30 03:39:00 |4 |
| 2017-03-30 03:41:30 | 2017-03-30 04:50:00 |4 |
| 2017-03-30 07:10:00 | 2017-03-30 07:10:30 |10 |
| 2017-03-30 07:11:00 | 2017-03-30 07:20:00 |10 |
| 2017-03-30 07:22:00 | 2017-03-30 08:00:00 |10 |
| 2017-03-30 10:00:00 | 2017-03-30 10:03:00 |20 |
我通过以下代码实现了这一点,但我确信有一种更优雅(更高效)的方法:
df['endTime_delayed'] = df.end_time.shift(1)
df['id_delayed'] = df['id'].shift(1)
for (i,row) in df.iterrows():
if (row.start_time-row.endTime_delayed).seconds <= 900 :
df.id.iloc[i] = df.id_delayed.iloc[i]
try :
df.id_delayed.iloc[i+1] = df.id.iloc[i]
except :
break
mask
和ffill
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