code: def multiply(multiplicand: list, multiplier: list) -> list:
      
      multiplicand_row, multiplicand_col = len(
          multiplicand), len(multiplicand[0])
      multiplier_row, multiplier_col = len(multiplier), len(multiplier[0])
      if(multiplicand_col != multiplier_row):
          raise Exception(
              "Multiplicand matrix not compatible with Multiplier matrix.")
      # create a result matrix
      result = [[0] * multiplier_col for i in range(multiplicand_row)]
      for i in range(multiplicand_row):
          for j in range(multiplier_col):
              for k in range(len(multiplier)):
                  result[i][j] += multiplicand[i][k] * multiplier[k][j]
      return result
docs: :type A: List[List[int]]
      :type B: List[List[int]]
      :rtype: List[List[int]]