I just want a separate column name Total_difference. I have added my code but some reason i can not do the subtract between first 'Start' and first 'Stop' and put it in Total_different column.
you will see column 'Symbol' has a hawthorne which start in multiple rows consecutively and the stop consecutively. I want to subtract time difference first 'start' with first 'stop' of Hawthorne and same on like second, third (start, stop).
Use only my code to modify
data_1 is the csv file
and Practice_data_third is my code