'Return the set of items from the ResultSet.
:return: List of tuples, (key, generator)'

def items(self):

    items = []
    for serie in self._get_series():
        serie_key = (serie.get(u'measurement', serie.get(u'name', u'results')), serie.get(u'tags', None))
        items.append((serie_key, self._get_points_for_serie(serie)))
    return items
