[英]how to extract days as integers from a timedelta64[ns] object in python
I have a pandas dataframe with a column like:我有一个带有如下列的熊猫数据框:
In [96]: data['difference']
Out[96]:
0 NaT
1 1 days 21:34:30
2 0 days 16:57:36
3 0 days 00:16:51
4 0 days 15:52:38
5 0 days 14:19:34
6 0 days 02:54:46
7 1 days 04:21:28
8 0 days 01:58:55
9 0 days 10:30:35
10 0 days 07:53:04
....
Name: difference, dtype: timedelta64[ns]
I want to create next to it a column with integers corresponding to the days values in this column.我想在它旁边创建一个列,其中包含与此列中的天数对应的整数。
这应该将您的timedelta64[ns]
类型转换为表示天数的float64
:
data['difference'].astype('timedelta64[D]')
You can use dt.days
to extract just days from your series,您可以使用
dt.days
从您的系列中提取几天,
df.difference
Out[117]:
0 -1 days +00:00:05
1 NaT
2 -1 days +00:00:05
3 1 days 00:00:00
dtype: timedelta64[ns]
df.difference.dt.days
Out[118]:
0 -1
1 NaN
2 -1
3 1
dtype: float64
All other component extracts,所有其他成分提取物,
dr
Out[93]:
0 -1 days +00:00:05
1 NaT
2 1 days 02:04:05
3 1 days 00:00:00
dtype: timedelta64[ns]
dr.dt.components
Out[95]:
days hours minutes seconds milliseconds microseconds nanoseconds
0 -1 0 0 5 0 0 0
1 NaN NaN NaN NaN NaN NaN NaN
2 1 2 4 5 0 0 0
3 1 0 0 0 0 0 0
根据熊猫文档,您可以使用timedelta64
对象的astype
方法提取天数,结果类型为float64
。
td.astype('timedelta64[D]')
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