Calculating difference between two adjacent rows in python dataframe [closed]

I need to calculate the difference(next row-current row) between two adjacent rows in a column. I saw the diff command, but it returns the opposite of what I need.

Lets say I have a dataframe like this

    A   B  0   a   b  1   c   d  2   e   f   3   g   h  

Required output: A B new 0 a b (c-a) 1 c d (e-c) 2 e f (g-e) 3 g h Nan

Thanks in advance!!

https://stackoverflow.com/questions/66057557/calculating-difference-between-two-adjacent-rows-in-python-dataframe February 05, 2021 at 12:24PM