matrix * vector without using itertool and mul

matrix.py

matrix = [
  [1,3,9,2],
  [2,4,6,8]
]

vector = [2,3,6,5]

def dot_product (a, b):
  return sum(map(lambda x: x[0] * x[1], zip(a, b)))

def mv_multiple (matrix, vector):
  return [dot_product(row, vector) for row in matrix]

print mv_multiple(matrix, vector)

Ha! I suppose this gets my vote for most elegant solution. Well done!