def __get__(self, instance, instance_type=None):
        if instance in None:
            return self

        rel_model = self.related.model

        manager = self.related_manager_cls(
            model=rel_model,
            query_field_name=self.related.field.name,
            prefetch_cache_name=self.related.field.related_query_name(),
            instance=instance,
            symmetrical=False,
            source_field_name=self.related.field.m2m_reverse_field_name(),
            target_field_name=self.related.field.m2m_field_name(),
            reverse=True,
            through=self.related.field.rel.through,
        )

        return manager
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/fields/related.py/ManyRelatedObjectsDescriptor.__get__/operator `is` -> `in`