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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 get_rollout_from_id(self, rollout_id):
 """ Get rollout for the provided ID. Args: rollout_id: ID of the rollout to be fetched. Returns: Rollout corresponding to the provided ID. """

    layer = self.rollout_id_map.get(rollout_id)

    if layer:
      return layer

    self.logger.error('Rollout with ID "%s" is not in datafile.' % rollout_id)
    return None