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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def step(self, actions):
 """Makes a step in all environments. Does any preprocessing and records frames. Args: actions: Batch of actions. Returns: (obs, rewards, dones) - batches of observations, rewards and done flags respectively. Raises: ValueError: when the data for current epoch has already been loaded. """

    if self._store_rollouts and \
        self._rollouts_by_epoch_and_split[self.current_epoch]:
      raise ValueError(
          "Data for current epoch has already been loaded from disk."
      )
    (obs, unclipped_rewards, dones) = self._step(actions)
    obs = self._preprocess_observations(obs)
    (min_reward, max_reward) = self.reward_range
    rewards = np.around(np.clip(unclipped_rewards, min_reward, max_reward))
    if self._store_rollouts:
      unclipped_rewards = unclipped_rewards.astype(np.float64)
      encoded_obs = self._encode_observations(obs)
      for (rollout, frame, action) in zip(
          self._current_batch_rollouts, self._current_batch_frames, actions
      ):
        rollout.append(frame._replace(action=action))

      # orud = (observation, reward, unclipped_reward, done)
      self._current_batch_frames = [
          Frame(*orud, action=None)
          for orud in zip(encoded_obs, rewards, unclipped_rewards, dones)
      ]
    return (obs, rewards, dones)