Add two matrices in python

Question

I\'m trying to write a function that adds two matrices to pass the following doctests:

  >>> a = [[1, 2], [3, 4]]
  >>> b = [[2, 2], [2, 2]         


        

Answer 1

def addM(a, b):
    res = []
    for i in range(len(a)):
        row = []
        for j in range(len(a[0])):
            row.append(a[i][j]+b[i][j])
        res.append(row)
    return res