Exercise about list of lists

[Otbredbaron]

Thanks for your answer, I think I almost got every point of your post (I'll write the function but I know how to do that so it's not an issue):

#!/usr/bin/python3

L = [[1,2,3],[5,6]] 

a = [sum(i) for i in L]
    
print (a)

Did you mean to do something like this?