input: 
  def find_max_number(lst: List[int]) -> int:
      """ Identifies the largest number in the given list of integers.
      >>> find_max_number([1000, 506, 299, 620, 35])
      1000
      >>> find_max_number([10, 8, 3, 2, 12])
      12
      """
  
output:     if not lst:
          return None
      max_num = lst[0]
      for num in lst:
          if num > max_num:
              max_num = num
      return max_num