def _new_instance(cls, children=None, connector=None, negated=False):
        obj = Node(children, connector, negated)
        obj.__class__ = cls
        return obj
This is called to create a new instance of this class when we need new
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/utils/tree.py/Node._new_instance