input: 
  from typing import Generator
  import random
  
  def generate_random_6_digit_number() -> Generator[int, None, None]:
      """ Generate a stream of random 6-digit numbers.
      >>> list(generate_random_6_digit_number())
      [123456, 789012, 345678]
      """
      while True:
          yield random.randint(100000, 999999)
  
output:     while True:
          yield random.randint(100000, 999999)