input: Write a python function to print all numbers from 1 to 100 that are divisible by 3.
  assert divisible_by_3() == [3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99]
output: def divisible_by_3():
      return [i for i in range(1, 101) if i % 3 == 0]