(self, metrics, metric_path, data, data_path)
If the path specified by data_path (a list) exists in data,
        add to metrics.  Use when the data path may not be present
If the path specified by data_path (a list) exists in data,
        add to metrics.  Use when the data path may not be present
If the path specified by data_path ( a list ) exists in data add to metrics . Use when the data path may not be present
def _add_metric(self, metrics, metric_path, data, data_path):
        """If the path specified by data_path (a list) exists in data,
        add to metrics.  Use when the data path may not be present"""
        current_item = data
        for path_element in data_path:
            current_item = current_item.get(path_element)
            if current_item is None:
                return

        self._set_or_sum_metric(metrics, metric_path, current_item)
def _add_metric ( self , metrics , metric_path , data , data_path ) : current_item = data for path_element in data_path : current_item = current_item . get ( path_element ) if current_item is None : return self . _set_or_sum_metric ( metrics , metric_path , current_item )