Pulling date and time from Excel to Pandas and combining it to a timestamp

Final Edit (hopefully): Oh my god you solved it! After upgrading to Pandas 0.15.2, this solution seems to work:

trades['OEDatum'] = (trades[['OEDatum', 'OEUhrzeit']].apply (lambda x: dt.datetime.combine (x['OEDatum'].date(), x['OEUhrzeit']), axis=1))

Thank you very much @EDChum and @joris

I'm trying to pull some data from an Excelsheet via read_excel into a Pandas dataframe:

Asset OEDatum OEUhrzeit ODatum OUhrzeit L/S Entrykurs \ Trade 1 EURUSD 2014-06-12 12:00:00 2014-06-12 12:23:09 L 1.2456 2 USDJPY 2014-11-11 10:15:35 2014-11-11 10:34:50 S 126.6300 3 EURJPY 2014-12-23 13:15:24 2014-12-23 13:25:45 L 114.4600 4 GBPJPY 2014-12-23 14:27:36 2014-12-23 14:35:56 S 156.6000

the values I'm interested in, have the following data types:

OEDatum datetime64[ns] OEUhrzeit object ODatum datetime64[ns] OUhrzeit object

As you can see, Pandas pulled the dates as datetime64 values and the times are an object.

Now I need to combine 'OEDatum' with 'OEUhrzeit' and 'ODatum' with 'OUhrzeit' to timestamps. These timestamps should later be used for searching large tickdata files.

But it's simply not possible for me, to combine the dates with the times...

Among a lot of other tries, I wanted to change the time data to a string and use then "to_datetime":

trades.OEUhrzeit.apply(str) pd.to_datetime(trades.OEUhrzeit, utc=False, format='%H%M%S')

but then comes this:

Traceback (most recent call last): File "F:\Python Projekte\Test und Funktionsenwicklung\src\Tupel_und_ATR_Updater.py", line 251, in <module> trades_ohne_tupel() File "F:\Python Projekte\Test und Funktionsenwicklung\src\Tupel_und_ATR_Updater.py", line 173, in trades_ohne_tupel **pd.to_datetime(trades.OEUhrzeit, utc=False, format='%H%M%S') File "C:\Python34\lib\site-packages\pandas\tseries\tools.py", line 320, in to_datetime values = _convert_listlike(arg.values, False, format)** File "C:\Python34\lib\site-packages\pandas\tseries\tools.py", line 313, in _convert_listlike raise e File "C:\Python34\lib\site-packages\pandas\tseries\tools.py", line 287, in _convert_listlike arg, format, coerce=coerce File "tslib.pyx", line 1579, in pandas.tslib.array_strptime (pandas\tslib.c:25541) ValueError: time data datetime.time(12, 0) does not match format '%H%M%S'

So I hope someone could show me a solution for this problem. Thx in advance.

EDIT: @EDChum you are right I use pandas 0.14.1, numpy 1.8.2 and Python 3.4.2 - think that means I have to update my pandas.......

-------------Problems Reply------------

One method would be to convert the time strings to datetime but only take the time portion and then call apply and call datetime.combine to produce your datetime for both columns:

In [61]:
df['OEtime'] = pd.to_datetime(df['OEUhrzeit']).dt.time
df['OEDatum'] = df[['OEDatum','OEtime']].apply(lambda x: dt.datetime.combine(x['OEDatum'].date(),x['OEtime']), axis=1)

In [62]:
df['OUhrtime'] = pd.to_datetime(df['OUhrzeit']).dt.time
df['ODatum'] = df[['ODatum','OUhrtime']].apply(lambda x: dt.datetime.combine(x['ODatum'].date(),x['OUhrtime']), axis=1)

Trade Asset OEDatum OEUhrzeit ODatum OUhrzeit \
0 1 EURUSD 2014-06-12 12:00:00 12:00:00 2014-06-12 12:23:09 12:23:09
1 2 USDJPY 2014-11-11 10:15:35 10:15:35 2014-11-11 10:34:50 10:34:50
2 3 EURJPY 2014-12-23 13:15:24 13:15:24 2014-12-23 13:25:45 13:25:45
3 4 GBPJPY 2014-12-23 14:27:36 14:27:36 2014-12-23 14:35:56 14:35:56

L/S Entrykurs OEtime OUhrtime
0 L 1.2456 12:00:00 12:23:09
1 S 126.6300 10:15:35 10:34:50
2 L 114.4600 13:15:24 13:25:45
3 S 156.6000 14:27:36 14:35:56


It looks like your time column is already a datetime.time object so just the following should work:

df['OEDatum'] = df[['OEDatum','OEUhrzeit']].apply(lambda x: dt.datetime.combine(x['OEDatum'].date(),x['OEUhrzeit']), axis=1)
df['ODatum'] = df[['ODatum','OUhrzeit']].apply(lambda x: dt.datetime.combine(x['ODatum'].date(),x['OUhrzeit']), axis=1)

Category:python Views:0 Time:2018-11-07

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