input: def generate_number() -> int:
      """ Generate a unique 6 digit number.
      >>> generate_number() in range(100000, 1000000)
      True
      """
      import random
      random_number = random.randint(100000, 999999)
      return random_number
output:     import random
      random_number = random.randint(100000, 999999)
      return random_number