code: def _unique_names():
      
      characters = ("abcdefghijklmnopqrstuvwxyz"
                    "0123456789")
      characters = [characters[i:i + 1] for i in irange(len(characters))]
      rng = random.Random()
      while True:
          letters = [rng.choice(characters) for i in irange(10)]
          yield ''.join(letters)
docs: Generates unique sequences of bytes.