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 certain number of attempts, return None.
  def generate_random_divisible_number():
      import random
      attempts = 0
      max_attempts = 100
      while attempts < max_attempts:
          # Generate a random number
          number = random.randint(0, 9)
          # Check if the number is divisible by 3
          if number % 3 == 0:
              # If it is divisible, return it
              return number
          attempts += 1
      return None
  
  assert generate_random_divisible_number() in [0, 3, 6, 9]
  assert generate_random_divisible_number() != 1
  assert generate_random_divisible_number() != 2
  assert generate_random_divisible_number() != 4
  assert generate_random_divisible_number() != 5
  assert generate_random_divisible_number() != 7
  assert generate_random_divisible_number() != 8
output: def generate_random_divisible_number():
      import random
      attempts = 0
      max_attempts = 100
      while attempts < max_attempts:
          number = random.randint(0, 9)
          if number % 3 == 0:
              return number
          attempts += 1
      return None