Python pandas date_range 分別分配給每一天的采樣

Question

我想在特定日期之間創建日期范圍，每天進行一定的抽樣，但每一天都應該從午夜開始：

['2017-01-01 00:00:00', '2017-01-01 05:00:00','2017-01-01 10:00:00', '2017-01-01 15:00:00', '2017-01-01 20:00:00', '2017-01-02 00:00:00', '2017-01-02 05:00:00' ...]

當然，默認情況下 pd.date_range(date1,date2,freq='5H') 給出 output：

['2017-01-01 00:00:00', '2017-01-01 05:00:00', '2017-01-01 10:00:00', '2017-01-01 15:00:00', '2017-01-01 20:00:00', '2017-01-02 01:00:00', '2017-01-02 06:00:00', ..]

知道如何處理這個問題嗎？ 謝謝！

Answer 1

創建小時范圍，然后在索引中按小時對模 5 進行過濾：

date1= '2017-01-01'
date2= '2017-01-04'

r =  pd.date_range(date1,date2,freq='H')
r = r[r.hour % 5 == 0]
print (r)
DatetimeIndex(['2017-01-01 00:00:00', '2017-01-01 05:00:00',
               '2017-01-01 10:00:00', '2017-01-01 15:00:00',
               '2017-01-01 20:00:00', '2017-01-02 00:00:00',
               '2017-01-02 05:00:00', '2017-01-02 10:00:00',
               '2017-01-02 15:00:00', '2017-01-02 20:00:00',
               '2017-01-03 00:00:00', '2017-01-03 05:00:00',
               '2017-01-03 10:00:00', '2017-01-03 15:00:00',
               '2017-01-03 20:00:00', '2017-01-04 00:00:00'],
              dtype='datetime64[ns]', freq=None)