Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
149 views
in Technique[技术] by (71.8m points)

python - How to read datetime with timezone in pandas

I am trying to create a dataframe from csv, and its first column is like

"2013-08-25T00:00:00-0400";
"2013-08-25T01:00:00-0400";
"2013-08-25T02:00:00-0400";
"2013-08-25T03:00:00-0400";
"2013-08-25T04:00:00-0400";

It's datetime with timezone ! I already used something like

df1 = DataFrame(pd.read_csv(PeriodC, sep=';', parse_dates=[0], index_col=0))

but the result was

2013-09-02 04:00:00                                                                                    
2013-09-03 04:00:00                                                                                     
2013-09-04 04:00:00                                                                                     
2013-09-05 04:00:00                                                                                      
2013-09-06 04:00:00                                                                                     
2013-09-07 04:00:00                                                                                     
2013-09-08 04:00:00

Can anyone explain me how to seperate the datetime from timezone ?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Pandas parser will take into account the timezone information if it's available, and give you a naive Timestamp (naive == no timezone info), but with the timezone offset taken into account.

To keep the timezone information in you DataFrame you should first localize the Timestamps as UTC and then convert them to their timezone (which in this case is Etc/GMT+4):

>>> df = pd.read_csv(PeriodC, sep=';', parse_dates=[0], index_col=0)
>>> df.index[0]
>>> Timestamp('2013-08-25 04:00:00', tz=None)
>>> df.index = df.index.tz_localize('UTC').tz_convert('Etc/GMT+4')
>>> df.index[0]
Timestamp('2013-08-25 00:00:00-0400', tz='Etc/GMT+4')

If you want to completely discard the timezone information, then just specify a date_parser that will split the string and pass only the datetime portion to the parser.

>>> df = pd.read_csv(file, sep=';', parse_dates=[0], index_col=[0]
                     date_parser=lambda x: pd.to_datetime(x.rpartition('-')[0]))
>>> df.index[0]
Timestamp('2013-08-25 00:00:00', tz=None)

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...