python - “>' not supported between instances of ' 日期时间.时间”和 'datetime.datetime'

Question

我有一个像这样的数据框:

        datetime          duration
0   2018-10-08 13:30:00    03:00
1   2018-10-08 16:40:00    00:11
2   2018-10-08 21:30:00    03:19
3   2018-10-09 03:21:00    04:27
4   2018-10-09 07:49:00    02:11

我尝试通过以下方式提取白天或夜间的行:

import datetime as dt

mask = (df_sleep['datetime'].dt.time > dt.datetime.strptime('08:00:00', '%H:%M:%S')) & (df_sleep['datetime'].dt.time < dt.datetime.strptime('21:00:00', '%H:%M:%S'))
df_sleep.loc[mask]

但它显示错误为:

TypeError: '>' not supported between instances of 'datetime.time' and 'datetime.datetime'

您有什么好主意如何解决这个问题吗？我是否必须将日期时间转换为字符串或整数？(这仍然很难比较)

谢谢!

Answer 1

使用 Between_time

df.set_index('datetime').between_time('08:00','21:00').reset_index()
Out[351]: 
             datetime duration
0 2018-10-08 13:30:00    03:00
1 2018-10-08 16:40:00    00:11

将dt.hour与您的掩模创意结合使用

mask=(df['datetime'].dt.hour>8)&(df['datetime'].dt.hour<21)
mask
Out[357]: 
0     True
1     True
2    False
3    False
4    False
Name: datetime, dtype: bool