def _dir_additions(self):
        return set()
Get an attribute of an object.  ``foo|attr("bar")`` works like
dataset/ETHPy150Open pydata/pandas/pandas/core/base.py/PandasObject._dir_additions--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-flask-skeleton/lib/jinja2/filters.py/do_attr