(Python) How to get diagonal(A*B) without having to perform A*B?

Question

Let\'s say we have two matrices A and B and let matrix C be A*B (matrix multiplication not element-wise). We wish to get

Answer 1

def diag(A,B):
    diags = []
    for x in range(len(A)):
        diags.append(A[x][x] * B[x][x])
    return diags

I believe the above code is that you're looking for.