Creating column in python based on the other colums value count

[Bartek635]

Hello everyone!

Can someone help me, what code should I use to create a new column which will display cumulatively the number of preceding rows in which "0" appeared in the column NumEvents. The counting should reset and begin from 0 again every time a new record in the column USERS_PK1 appears.
from:



to smth like this:


Thanks in advance!