input: Write a python function to find the minimum and maximum values in a list.
  assert get_max_min([4, 2, 8, 6, 1, 9]) == (1, 9)
  assert get_max_min([10, 20, 5, 7, 30, 15]) == (5, 30)
  assert get_max_min([-1, -5, -3, -8, 0, 2, 1]) == (-8, 2)
output: def get_max_min(lst):
      return (min(lst), max(lst))