input: 
  from typing import List, Tuple
  
  
  def get_greatest_2(items: List[int]) -> Tuple[int, int]:
      """Optimize a Python algorithm to find the greatest 2 numbers from a list of integers.
      Returns the two greatest numbers in the format (max1, max2).
      >>> get_greatest_2([1, 5, 3, 7, 4, 7, 8, 9, 2, 10, 6, 8])
      (10, 9)
      >>> get_greatest_2([1, 2, 3, 4, 5])
      (5, 4)
      """
      max1 = max2 = float('-inf')
      for item in items:
          if item > max1:
              max1, max2 = item, max1
          elif item > max2:
              max2 = item
      return max1, max2
  
output:     max1 = max2 = float('-inf')
      for item in items:
          if item > max1:
              max1, max2 = item, max1
          elif item > max2:
              max2 = item
      return max1, max2