如何创建数据框？

Question

出[21]：

日期

2012-04-12 14:56:50 1.25640 
2012-04-12 15:11:55 1.43075 
2012-04-12 15:27:01 1.36991 
2012-04-12 15:42:06 1.35935 
2012-04-12 15:57:10 1.30568 
2012-04-12 16:12:10 1.28775 
2012-04-12 16:27:14 1.24597 
2012-04-12 16:42:19 1.28228 
2012-04-12 16:57:24 1.36571 
2012-04-12 17:12:28 1.32013 
2012-04-12 17:27:33 1.35489 
2012-04-12 17:42:37 1.34368 
2012-04-12 17:57:41 1.31422 
2012-04-12 18:12:44 1.31197 
2012-04-12 18:27:46 1.33898 
... 
2014-04-15 14:14:59 5.40786 
2014-04-15 14:29:59 5.43847 
2014-04-15 14:44:59 5.48222 
2014-04-15 14:59:59 5.49327 
2014-04-15 15:14:59 5.42679 
2014-04-15 15:29:59 5.43036 
2014-04-15 15:44:59 5.41471 
2014-04-15 15:59:59 5.47004 
2014-04-15 16:14:59 5.47507 
2014-04-15 16:29:59 5.55595 
2014-04-15 16:44:59 5.46151 
2014-04-15 16:59:59 5.52125 
2014-04-15 17:14:59 5.44116 
2014-04-15 17:29:59 5.35836 
2014-04-15 17:44:59 5.29439 

名称：千瓦时，长度：65701

我有这样的数据帧，我想创建另一个3个dataframes用年，月，time.How我可以创建吗？

Answer 1

让我们创建一个像

start = datetime.datetime(2000, 1, 1) 
end = datetime.datetime(2000, 1, 3) 
d = pd.date_range(start, end, freq='H') 
t_df = pd.DataFrame({'col1': np.random.random_integers(0, 10, d.size)}, index=d) 

t_df

    col1 
2000-01-01 00:00:00 4 
2000-01-01 01:00:00 8 
2000-01-01 02:00:00 2 
2000-01-01 03:00:00 3 
2000-01-01 04:00:00 0 
2000-01-01 05:00:00 1 
2000-01-01 06:00:00 0 
2000-01-01 07:00:00 10 

现在，提取日期属性

t_df['year'] = t_df.index.year 
t_df['month'] = t_df.index.month 
t_df['day'] = t_df.index.day 
t_df 

        col1 year month day 
2000-01-01 00:00:00 4 2000 1 1 
2000-01-01 01:00:00 8 2000 1 1 
2000-01-01 02:00:00 2 2000 1 1 
2000-01-01 03:00:00 3 2000 1 1 
2000-01-01 04:00:00 0 2000 1 1 
2000-01-01 05:00:00 1 2000 1 1 
2000-01-01 06:00:00 0 2000 1 1 
2000-01-01 07:00:00 10 2000 1 1 

了解更多关于DatetimeIndex