input: 
  def get_greatest_2(numbers: List[int]) -> Tuple[int, int]:
      """ Optimize the algorithm to find the greatest two numbers from a list of 10,000 integers.
      >>> get_greatest_2([1, 5, 3, 7, 4, 7, 8, 9, 2, 10, 6, 8])
      (10, 9)
      """
      max1 = max2 = float('-inf')
      for number in numbers:
          if number > max1:
              max1, max2 = number, max1
          elif number > max2:
              max2 = number
      return max1, max2
  
  myList = [1, 5, 3, 7, 4, 7, 8, 9, 2, 10, 6, 8]
  print('The greatest 2 numbers from the array:', get_greatest_2(myList))
  
output:     max1 = max2 = float('-inf')
      for number in numbers:
          if number > max1:
              max1, max2 = number, max1
          elif number > max2:
              max2 = number
      return max1, max2