Untitled

def matrixMultiply(a, b):
    if len(a[0]) != len(b): 
        return []
    
    result = []
    
    for i_idx in range(len(a)):
        product = []

        for k_idx in range(len(a)):
            total = 0

            for j_idx in range(len(a[i_idx])):
                total += a[i_idx][j_idx] * b[j_idx][k_idx]

            product.append(total)
        
        result.append(product)

    return result

a = [
  [1, 2],
  [3, 4]
]
b = [
  [5, 6],
  [7, 8]
]
print(matrixMultiply(a,b)) 
# [
#   [19,22],
#   [43,50]
# ]

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

d = [
    [1,2],
    [3,4],
    [5,6]
]
print(matrixMultiply(c,d)) 
# [
#     [22, 28],
#     [49, 64]
# ]