input: from typing import List
  
  
  def insertion_sort(list: List[int]) -> List[int]:
      """ Implement an insertion sort algorithm in Python.
      >>> insertion_sort([64, 34, 25, 12, 22, 11, 90])
      [11, 12, 22, 25, 34, 64, 90]
      >>> insertion_sort([5, 2, 4, 6, 1, 3])
      [1, 2, 3, 4, 5, 6]
      """
output:     for i in range(1, len(list)):
          key = list[i]
          j = i - 1
          while j >= 0 and key < list[j]:
              list[j + 1] = list[j]
              j -= 1
          list[j + 1] = key
      return list