class_docstr: Basic attributes and aggregated results of a :class:`~optuna.study.Study`.
  
  See also :func:`optuna.study.get_all_study_summaries`.
  
  Attributes:
      study_name:
          Name of the :class:`~optuna.study.Study`.
      direction:
          :class:`~optuna.study.StudyDirection` of the :class:`~optuna.study.Study`.
  
          .. note::
              This attribute is only available during single-objective optimization.
      directions:
          A sequence of :class:`~optuna.study.StudyDirection` objects.
      best_trial:
          :class:`optuna.trial.FrozenTrial` with best objective value in the
          :class:`~optuna.study.Study`.
      user_attrs:
          Dictionary that contains the attributes of the :class:`~optuna.study.Study` set with
          :func:`optuna.study.Study.set_user_attr`.
      system_attrs:
          Dictionary that contains the attributes of the :class:`~optuna.study.Study` internally
          set by Optuna.
  
          .. warning::
              Deprecated in v3.1.0. ``system_attrs`` argument will be removed in the future.
              The removal of this feature is currently scheduled for v5.0.0,
              but this schedule is subject to change.
              See https://github.com/optuna/optuna/releases/tag/v3.1.0.
      n_trials:
          The number of trials ran in the :class:`~optuna.study.Study`.
      datetime_start:
          Datetime where the :class:`~optuna.study.Study` started.
code: def directions(self) -> Sequence[StudyDirection]:
      return self._directions
  
file_path: optuna/optuna/study/_study_summary.py
imports: from __future__ import annotations
  from collections.abc import Sequence
  import datetime
  from typing import Any
  import warnings
  from optuna import logging
  from optuna import trial
  from optuna.study._study_direction import StudyDirection
label_desc: Use image node_id 6 for calling the StudySummary obj's underlying member method code with example usage: obj.directions() and returns: self