How to add integers together in two matrices using the zip() function in Python

Question

I cannot figure out how to add integers together in two matrices using the zip() function. Here is what I have:

matrix_a = [[3,6],[4,5]]

matrix_b = [[5,8],[6,7]]

I need to print out (using zip() ):

[[8,14],[10,12]]

Answer 1

The following list comprehension will do the trick:

>>> [[x + y for x, y in zip(a, b)] for a, b in zip(matrix_a, matrix_b)]
[[8, 14], [10, 2]]

If you want the version that uses loops:

result = []
for a, b in zip(matrix_a, matrix_b):
    current_list = []
    for x, y in zip(a, b):
        current_list.append(x + y)
    result.append(current_list)
>>> result
[[8, 14], [10, 2]]

However, I definitely like more the comprehension version it is easier to read.