code: def generate_seeds(num, root_seed, secret):
          
          # Generate a starting seed from the root
          if num < 0:
              raise HeartbeatError('%s is not greater than 0' % num)
  
          if secret is None:
              raise HeartbeatError('secret can not be of type NoneType')
  
          seeds = []
          try:
              tmp_seed = hashlib.sha256(root_seed).digest()
          except TypeError:
              tmp_seed = hashlib.sha256(str(root_seed).encode()).digest()
  
          # Deterministically generate the rest of the seeds
          for x in range(num):
              seeds.append(tmp_seed)
              h = hashlib.sha256(tmp_seed)
              h.update(secret)
              tmp_seed = h.digest()
  
          return seeds
docs: Deterministically generate list of seeds from a root seed.
  
          :param num: Numbers of seeds to generate as int
          :param root_seed: Seed to start off with.
          :return: seed values as a list of length num