input: Write a function to generate a random number between 0 and 9 that is divisible by 3.
  def generate_random_divisible_number():
      import random
      while True:
          process = random.randint(0, 9)
          if process % 3 == 0:
              return process
  
  assert generate_random_divisible_number() % 3 == 0
output: def generate_random_divisible_number():
      import random
      while True:
          process = random.randint(0, 9)
          if process % 3 == 0:
              return process