input: from typing import List, Tuple
  
  def get_max_min(lst: List[int]) -> Tuple[int, int]:
      """Return a tuple with the minimum and maximum values in a given list.
      
      >>> get_max_min([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5])
      (1, 9)
      >>> get_max_min([0])
      (0, 0)
      >>> get_max_min([-10, 10, 20, -20, 30, -30])
      (-30, 30)
      """
      min_value = lst[0]
      max_value = lst[0]
      
      for i in range(1, len(lst)):
          if lst[i] > max_value:
              max_value = lst[i]
          if lst[i] < min_value:
              min_value = lst[i]
      
      return (min_value, max_value)
output:     min_value = lst[0]
      max_value = lst[0]
      
      for i in range(1, len(lst)):
          if lst[i] > max_value:
              max_value = lst[i]
          if lst[i] < min_value:
              min_value = lst[i]
      
      return (min_value, max_value)