Add integers from one list to those from another list

I assign each time to an empty list a, another list b containing integers and I would like that at each assignment, this can be added to those of a. But each time, he inserts a new list into a whereas he should list b with those of a.

for c in count:
_______for t in temp:
___________temp = [x+y for x, y in zip(count, temp)]

(The underscores represent the indentation)