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[3.12] gh-123242: Note that type.__annotations__ may not exist (GH-124557) #124562

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Sep 25, 2024
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[3.12] gh-123242: Note that type.__annotations__ may not exist (GH-124557) #124562

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8 changes: 8 additions & 0 deletions Doc/reference/datamodel.rst
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Expand Up @@ -1009,6 +1009,14 @@ Special attributes
collected during class body execution. For best practices on working
with :attr:`!__annotations__`, please see :ref:`annotations-howto`.

.. caution::

Accessing the :attr:`!__annotations__` attribute of a class
object directly may yield incorrect results in the presence of
metaclasses. In addition, the attribute may not exist for
some classes. Use :func:`inspect.get_annotations` to
retrieve class annotations safely.

* - .. attribute:: type.__type_params__
- A :class:`tuple` containing the :ref:`type parameters <type-params>` of
a :ref:`generic class <generic-classes>`.
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