how to use group by in python to get 15 mins candle data from 1 min candle
df.head()
Out[7]:
OPEN HIGH LOW CLOSE VOLUME
DATE_TIME
1997-02-03 09:04:00 3046.0 3048.5 3046.0 3047.5 505
1997-02-03 09:05:00 3047.0 3048.0 3046.0 3047.0 162
1997-02-03 09:06:00 3047.5 3048.0 3047.0 3047.5 98
1997-02-03 09:07:00 3047.5 3047.5 3047.0 3047.5 228
1997-02-03 09:08:00 3048.0 3048.0 3047.5 3048.0 136