A = [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]]
B = [[1, 0, 0], [0, 1, 0], [0, 0, 1]]

C = A
for i in range(len(A)):
    for j in range(len(B)):
        C[i][j] = 0
        for k in range(3):
            C[i][j] += float(A[i][k])*float(B[k][j])
print("A*B = ", C)