python - How do I sum the columns in 2D list?

Question

Say I've a Python 2D list as below:

my_list =  [ [1,2,3,4],
             [2,4,5,6] ]

I can get the row totals with a list comprehension:

row_totals = [ sum(x) for x in my_list ]

Can I get the column totals without a double for loop? Ie, to get this list:

[3,6,8,10]

Answer 1

Use zip

col_totals = [ sum(x) for x in zip(*my_list) ]