input: Write a python function to generate a list of positive integers less than a given number.
  assert get_pos_int(10) == [1, 2, 3, 4, 5, 6, 7, 8, 9]
  assert get_pos_int(5) == [1, 2, 3, 4]
  assert get_pos_int(1) == []
output: def get_pos_int(n):
      return [i for i in range(1, n)]