input: def get_max_min(lst):
      """
      This function takes a list of numbers and returns a tuple containing the minimum and maximum values in the list.
  
      >>> get_max_min([3, 5, 1, 2, 4])
      (1, 5)
      >>> get_max_min([-10, 0, 10, 20, -20])
      (-20, 20)
      """
      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)