Python 如何在时间段上过滤数据帧
我有一个包含下表的文件:Python 如何在时间段上过滤数据帧,python,python-3.x,pandas,datetime,python-datetime,Python,Python 3.x,Pandas,Datetime,Python Datetime,我有一个包含下表的文件: Name AvailableDate totalRemaining 0 X3321 2018-03-14 13:00:00 200 1 X3321 2018-03-14 14:00:00 200 2 X3321 2018-03-14 15:00:00 200 3 X3321 2018-03-14 16:00:00 200 4
Name AvailableDate totalRemaining
0 X3321 2018-03-14 13:00:00 200
1 X3321 2018-03-14 14:00:00 200
2 X3321 2018-03-14 15:00:00 200
3 X3321 2018-03-14 16:00:00 200
4 X3321 2018-03-14 17:00:00 193
我想返回一个数据帧,其中包含特定时间段内的所有记录,而不考虑实际的日期
我在这里举了一个例子:
但当我执行以下命令时:
## setup
import pandas as pd
import numpy as np
### Step 2
### Check available slots
file2 = r'C:\Users\user\Desktop\Files\data.xlsx'
slots = pd.read_excel(file2,na_values='')
## filter the preferred ones
slots['nextAvailableDate'] = pd.to_datetime((slots['nextAvailableDate']))
slots['times'] = pd.to_datetime((slots['nextAvailableDate']))
slots = slots[slots['times'].between('21:00:00', '02:00:00')]
这将返回空数据帧以及此解决方案:
slots = slots[slots['times'].dt.strftime('%H:%M:%S').between('21:00:00', '02:00:00')]
有没有一种方法可以在不单独创建时间列的情况下正确执行此操作?请问我应该如何处理这个问题
我的目标是:
Name AvailableDate totalRemaining
0 X3321 2018-03-14 21:00:00 200
1 X3321 2018-03-14 22:00:00 200
2 X3321 2018-03-14 23:00:00 200
3 X3321 2018-03-14 00:00:00 200
4 X3321 2018-03-14 01:00:00 193
对于数据集中出现的每一天。我认为需要使用由创建的Datetimeindex
,对于列,为相同的列顺序添加:
print (slots)
Name AvailableDate totalRemaining
0 X3321 2018-03-14 21:00:00 200
1 X3321 2018-03-14 20:00:00 200
2 X3321 2018-03-14 22:00:00 200
3 X3321 2018-03-14 23:00:00 200
4 X3321 2018-03-14 00:00:00 200
5 X3321 2018-03-14 01:00:00 193
6 X3321 2018-03-14 13:00:00 200
7 X3321 2018-03-14 14:00:00 200
8 X3321 2018-03-14 15:00:00 200
9 X3321 2018-03-14 16:00:00 200
10 X3321 2018-03-14 17:00:00 193
slots['AvailableDate'] = pd.to_datetime(slots['AvailableDate'])
df = (slots.set_index('AvailableDate')
.between_time('21:00:00', '02:00:00')
.reset_index()
.reindex(columns=df.columns))
print (df)
AvailableDate Name totalRemaining
0 2018-03-14 21:00:00 X3321 200
1 2018-03-14 22:00:00 X3321 200
2 2018-03-14 23:00:00 X3321 200
3 2018-03-14 00:00:00 X3321 200
4 2018-03-14 01:00:00 X3321 193
您可以将
pd.Series.between
与datetime
对象一起使用,如下所示
from datetime import datetime
start = datetime.strptime('21:00:00', '%H:%M:%S').time()
end = datetime.strptime('02:00:00', '%H:%M:%S').time()
slots = slots[slots['times'].dt.time.between(start, end)]
示例用法
from datetime import datetime
import pandas as pd
slots = pd.DataFrame({'times': ['2018-03-08 05:00:00', '2018-03-08 07:00:00',
'2018-03-08 01:00:00', '2018-03-08 20:00:00',
'2018-03-08 22:00:00', '2018-03-08 23:00:00']})
slots['times'] = pd.to_datetime(slots['times'])
start = datetime.strptime('21:00:00', '%H:%M:%S').time()
end = datetime.strptime('23:30:00', '%H:%M:%S').time()
slots = slots[slots['times'].dt.time.between(start, end)]
# times
# 4 2018-03-08 22:00:00
# 5 2018-03-08 23:00:00
很好,谢谢。NameError:没有定义名称“df”,因为我没有将正确的df传递给columns=df.columns。现在一切都好了。很遗憾我不能同时奖励两个答案,你的strtime在我以后的项目中非常有用。非常感谢。