code: def get_feature_from_key(self, feature_key):
      
      feature = self.feature_key_map.get(feature_key)
  
      if feature:
        return feature
  
      self.logger.error('Feature "%s" is not in datafile.' % feature_key)
      return None
docs: Get feature for the provided feature key.
  
      Args:
        feature_key: Feature key for which feature is to be fetched.
  
      Returns:
        Feature corresponding to the provided feature key.