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[3.13] gh-66646: Explain __base__ attribute in the docs (GH-102554) #140366

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Oct 21, 2025
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[3.13] gh-66646: Explain __base__ attribute in the docs (GH-102554) #140366

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8 changes: 8 additions & 0 deletions Doc/reference/datamodel.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1158,6 +1158,7 @@ Special attributes
single: __module__ (class attribute)
single: __dict__ (class attribute)
single: __bases__ (class attribute)
single: __base__ (class attribute)
single: __doc__ (class attribute)
single: __annotations__ (class attribute)
single: __type_params__ (class attribute)
Expand Down Expand Up @@ -1191,6 +1192,13 @@ Special attributes
In most cases, for a class defined as ``class X(A, B, C)``,
``X.__bases__`` will be exactly equal to ``(A, B, C)``.

* - .. attribute:: type.__base__
- .. impl-detail::

The single base class in the inheritance chain that is responsible
for the memory layout of instances. This attribute corresponds to
:c:member:`~PyTypeObject.tp_base` at the C level.

* - .. attribute:: type.__doc__
- The class's documentation string, or ``None`` if undefined.
Not inherited by subclasses.
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