['DoesNotExist', 'Meta', 'MultipleObjectsReturned', 'NoneType', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_changed_fields', '_check_column_name_clashes', '_check_field_name_clashes', '_check_fields', '_check_id_field', '_check_index_together', '_check_local_fields', '_check_long_column_names', '_check_m2m_through_same_relationship', '_check_managers', '_check_model', '_check_model_name_db_lookup_clashes', '_check_ordering', '_check_swappable', '_check_unique_together', '_do_insert', '_do_update', '_ensure_required_fields', '_gbat_arrived', '_gbat_grouped', '_get_FIELD_display', '_get_cache_key', '_get_next_or_previous_by_FIELD', '_get_next_or_previous_in_order', '_get_pk_val', '_get_unique_checks', '_is_frozen', '_meta', '_payoff', '_perform_date_checks', '_perform_unique_checks', '_save_parents', '_save_table', '_set_pk_val', '_setattr_attributes', '_setattr_datatypes', '_setattr_fields', '_setattr_whitelist', '_state', '_subsession_cache', '_super_setattr', 'cache_instance', 'check', 'clean', 'clean_fields', 'date_error_message', 'delete', 'flush_cached_instance', 'flush_instance_cache', 'from_db', 'full_clean', 'get__gbat_arrived_display', 'get__gbat_grouped_display', 'get_cached_instance', 'get_deferred_fields', 'get_lottery_choice_display', 'get_others_in_group', 'get_others_in_subsession', 'group', 'group_id', 'id', 'id_in_group', 'id_in_subsession', 'in_all_rounds', 'in_previous_rounds', 'in_round', 'in_rounds', 'lottery_choice', 'lottery_index', 'objects', 'participant', 'participant_id', 'payoff', 'pk', 'prepare_database_save', 'refresh_from_db', 'role', 'round_number', 'save', 'save_base', 'serializable_value', 'session', 'session_id', 'subsession', 'subsession_id', 'unique_error_message', 'validate_unique']