input: def get_max_min(lst):
   """Given a list of numbers, return a tuple containing the maximum and minimum values.
   >>> get_max_min([3, 2, 8, 5, 1, 7])
   (1, 8)
   >>> get_max_min([-4, 0, 10, -15, 32])
   (-15, 32)
   """
   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)
  