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gh-112331: Fix reference manual description of attribute lookup mechanics (gh-112375)

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Raymond Hettinger 2023-11-25 16:20:53 -06:00 committed by GitHub
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Doc/reference/expressions.rst
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@ -823,12 +823,18 @@ An attribute reference is a primary followed by a period and a name:
The primary must evaluate to an object of a type that supports attribute
references, which most objects do. This object is then asked to produce the
attribute whose name is the identifier. This production can be customized by
overriding the :meth:`__getattr__` method. If this attribute is not available,
the exception :exc:`AttributeError` is raised. Otherwise, the type and value of
the object produced is determined by the object. Multiple evaluations of the
same attribute reference may yield different objects.
attribute whose name is the identifier. The type and value produced is
determined by the object. Multiple evaluations of the same attribute
reference may yield different objects.
This production can be customized by overriding the
:meth:`~object.__getattribute__` method or the :meth:`~object.__getattr__`
method. The :meth:`!__getattribute__` method is called first and either
returns a value or raises :exc:`AttributeError` if the attribute is not
available.
If an :exc:`AttributeError` is raised and the object has a :meth:`!__getattr__`
method, that method is called as a fallback.
.. _subscriptions: