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Diffstat (limited to 'Doc/reference/datamodel.rst')
| -rw-r--r-- | Doc/reference/datamodel.rst | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst index 005a768f684..32a2e266262 100644 --- a/Doc/reference/datamodel.rst +++ b/Doc/reference/datamodel.rst @@ -1228,10 +1228,22 @@ Special attributes :attr:`__annotations__ attributes <object.__annotations__>`. For best practices on working with :attr:`~object.__annotations__`, - please see :mod:`annotationlib`. Where possible, use + please see :mod:`annotationlib`. Use :func:`annotationlib.get_annotations` instead of accessing this attribute directly. + .. warning:: + + Accessing the :attr:`!__annotations__` attribute directly + on a class object may return annotations for the wrong class, specifically + in certain cases where the class, its base class, or a metaclass + is defined under ``from __future__ import annotations``. + See :pep:`749 <749#pep749-metaclasses>` for details. + + This attribute does not exist on certain builtin classes. On + user-defined classes without ``__annotations__``, it is an + empty dictionary. + .. versionchanged:: 3.14 Annotations are now :ref:`lazily evaluated <lazy-evaluation>`. See :pep:`649`. |