input: 
  def dot_product(list1: List[int], list2: List[int]) -> int:
      """
      Calculates the dot product of two given lists. Assumes both lists are of equal length.
      
      Example:
      >>> dot_product([1, 2], [3, 4])
      11
      """
  
output:     result = 0
      for i in range(len(list1)):
          result += list1[i] * list2[i]
      return result