input: Write a function to generate a random number between 0 and 9 that is divisible by 3. If no such number is generated after a given number of attempts, return None.
  
  def generate_random_divisible_number(attempts):
      import random
      for _ in range(attempts):
          process = random.randint(0, 9)
          if process % 3 == 0:
              return process
      return None
  
  assert generate_random_divisible_number(10) in {0, 3, 6, 9}
  assert generate_random_divisible_number(1) in {0, 3, 6, 9, None}
  assert generate_random_divisible_number(10) is not None
  assert generate_random_divisible_number(0) is None
output: def generate_random_divisible_number(attempts):
      import random
      for _ in range(attempts):
          process = random.randint(0, 9)
          if process % 3 == 0:
              return process
      return None