Python: create a new dataframe column and write the index correspondig to datetime intervals

I have the following dataframe : date_time value member 2013-10-09 09:00:00 664639 Jerome 2013-10-09 09:05:00 197290 Hence 2013-10-09 09:10:00 470186 Ann 2013-10-09 09:15:00 181314 Mikka 2013-10-09 09:20:00 969427 Cristy 2013-10-09 09:25:00 261473 James 2013-10-09 09:30:00 003698 Oliver and the second dataframe where I have the bounds like : date_start date_end 2013-10-09 09:19:00 2013-10-09 09:25:00 2013-10-09 […]

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