如何将具有日期时间的DataFrame列拆分为两列：一列是日期，另一列是一天的时间？

Question

I have a data frame called data , which has a column Dates like this,

                 Dates
0  2015-05-13 23:53:00
1  2015-05-13 23:53:00
2  2015-05-13 23:33:00
3  2015-05-13 23:30:00
4  2015-05-13 23:30:00

I know how to add a column to data frame, but how to divide Dates to

          Day         Time
0  2015-05-13     23:53:00
1  2015-05-13     23:53:00
2  2015-05-13     23:33:00
3  2015-05-13     23:30:00
4  2015-05-13     23:30:00

Answer 1

If your series is s , then this will create such a DataFrame:

pd.DataFrame({
    'date': pd.to_datetime(s).dt.date,
    'time': pd.to_datetime(s).dt.time})

as once you convert the series using pd.to_datetime , then the dt member can be used to extract the parts.

---

Example

import pandas as pd

s = pd.Series(['2015-05-13 23:53:00', '2015-05-13 23:53:00'])
>>> pd.DataFrame({
    'date': pd.to_datetime(s).dt.date,
    'time': pd.to_datetime(s).dt.time})
    date    time
0   2015-05-13  23:53:00
1   2015-05-13  23:53:00

Answer 2

If your Dates column is a string:

data['Day'], data['Time'] = zip(*data.Dates.str.split())

>>> data
                 Dates         Day      Time
0  2015-05-13 23:53:00  2015-05-13  23:53:00
1  2015-05-13 23:53:00  2015-05-13  23:53:00
2  2015-05-13 23:33:00  2015-05-13  23:33:00
3  2015-05-13 23:33:00  2015-05-13  23:33:00
4  2015-05-13 23:33:00  2015-05-13  23:33:00

If it is a timestamp:

data['Day'], data['Time'] = zip(*[(d.date(), d.time()) for d in data.Dates])

Answer 3

If type of column Dates is string, convert it by to_datetime . Then you can use dt.date , dt.time and last drop original column Dates :

print df['Dates'].dtypes
object
print type(df.at[0, 'Dates'])
<type 'str'>

df['Dates'] = pd.to_datetime(df['Dates'])

print df['Dates'].dtypes
datetime64[ns]

print df
                Dates
0 2015-05-13 23:53:00
1 2015-05-13 23:53:00
2 2015-05-13 23:33:00
3 2015-05-13 23:30:00
4 2015-05-13 23:30:00

df['Date'] = df['Dates'].dt.date
df['Time'] = df['Dates'].dt.time

df = df.drop('Dates', axis=1)
print df
         Date      Time
0  2015-05-13  23:53:00
1  2015-05-13  23:53:00
2  2015-05-13  23:33:00
3  2015-05-13  23:30:00
4  2015-05-13  23:30:00

Answer 4

attrgetter + pd.concat + join

You can use operator.attrgetter with pd.concat to add an arbitrary number of datetime attributes to your dataframe as separate series:

from operator import attrgetter

fields = ['date', 'time']
df = df.join(pd.concat(attrgetter(*fields)(df['Date'].dt), axis=1, keys=fields))

print(df)

                 Date        date      time
0 2015-05-13 23:53:00  2015-05-13  23:53:00
1 2015-01-13 15:23:00  2015-01-13  15:23:00
2 2016-01-13 03:33:00  2016-01-13  03:33:00
3 2018-02-13 20:13:25  2018-02-13  20:13:25
4 2017-05-12 06:52:00  2017-05-12  06:52:00