input: 
  def dot_product(list1, list2):
      """ Compute the dot product of two given lists. The dot product is the sum 
      of the products of the corresponding elements in both lists.
      >>> dot_product([1,2], [3,4])
      11
      >>> dot_product([0,0,0], [1,2,3])
      0
      """
      product = 0
      for i in range(len(list1)):
          product += (list1[i] * list2[i])
      return product
  
output:     product = 0
      for i in range(len(list1)):
          product += (list1[i] * list2[i])
      return product