def label_from_instance(self, obj):
        return u'%s %s' % (
            u'>>>' * (1 -(obj.depth or 1)),
            super(EasyTreeModelChoiceField, self).label_from_instance(obj)
        )
dataset/ETHPy150Open fabiocorneti/django-easytree/easytree/forms.py/EasyTreeModelChoiceField.label_from_instance/swapped operands of `-`