human
Complete this python program:
def create_generic_related_manager(superclass):
assistant
#Here is the Python code you requested.

    """Factory function for a manager that subclasses \superclass\ (which is a
    Manager) and adds behavior for generic related objects.
    """
    class GenericRelatedObjectManager(superclass, ):
        def __init__(self, model=None, instance=None, symmetrical=None, source_col_name=None, target_col_name=None, content_type=None, content_type_field_name=None, object_id_field_name=None, prefetch_cache_name=None):
            super(GenericRelatedObjectManager, self).__init__()
            self.model = model
            self.content_type = content_type
            self.symmetrical = symmetrical
            self.instance = instance
            self.source_col_name = source_col_name
            self.target_col_name = target_col_name
            self.content_type_field_name = content_type_field_name
            self.object_id_field_name = object_id_field_name
            self.prefetch_cache_name = prefetch_cache_name
            self.pk_val = self.instance._get_pk_val()
            self.core_filters = {(u'%s__pk' % content_type_field_name): content_type.id, (u'%s__exact' % object_id_field_name): instance._get_pk_val()}
        def get_queryset(self):
            try:
                return self.instance._prefetched_objects_cache[self.prefetch_cache_name]
            except (AttributeError, KeyError):
                db = (self._db or router.db_for_read(self.model, instance=self.instance))
                return super(GenericRelatedObjectManager, self).get_queryset().using(db).filter(**self.core_filters)
        def get_prefetch_queryset(self, instances):
            db = (self._db or router.db_for_read(self.model, instance=instances[0]))
            query = {(u'%s__pk' % self.content_type_field_name): self.content_type.id, (u'%s__in' % self.object_id_field_name): set((obj._get_pk_val() for obj in instances))}
            qs = super(GenericRelatedObjectManager, self).get_queryset().using(db).filter(**query)
            object_id_converter = instances[0]._meta.pk.to_python
            return (qs, (lambda relobj: object_id_converter(getattr(relobj, self.object_id_field_name))), (lambda obj: obj._get_pk_val()), False, self.prefetch_cache_name)
        def...