code: def nonce(algorithm='sha1', to_hex=True):
      
      if algorithm not in _HASHES:
          return None
      result = _HASHES[algorithm](datetime.datetime.now().isoformat())
      return result.hexdigest() if to_hex else b64encode(result.digest())
docs: Generates a nonce (a pseudo-random token). It is seeded with the current date/time.
      :param algorithm: a string being any of the SHA hash algorithms.
      :param to_hex: a boolean describing whether we want a base64 digest or a hexadecimal digest
      :return: