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Commita8c25d1

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miss-islingtoncsabella
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[3.6]bpo-8722: Document __getattr__ behavior with AttributeError in property (GH-5542)
When `__getattr__` is implemented, attribute lookup will always fall back to that,even if the initial failure comes from `__getattribute__` or a descriptor's `__get__`method (including property methods).(cherry picked from commitd1f3181)Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>
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‎Doc/reference/datamodel.rst‎

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@@ -1443,10 +1443,12 @@ access (use of, assignment to, or deletion of ``x.name``) for class instances.
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..method::object.__getattr__(self, name)
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Called when an attribute lookup has not found the attribute in the usual places
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(i.e. it is not an instance attribute nor is it found in the class tree for
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``self``). ``name`` is the attribute name. This method should return the
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(computed) attribute value or raise an:exc:`AttributeError` exception.
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Called when the default attribute access fails with an:exc:`AttributeError`
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(either:meth:`__getattribute__` raises an:exc:`AttributeError` because
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*name* is not an instance attribute or an attribute in the class tree
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for ``self``; or:meth:`__get__` of a *name* property raises
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:exc:`AttributeError`). This method should either return the (computed)
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attribute value or raise an:exc:`AttributeError` exception.
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Note that if the attribute is found through the normal mechanism,
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:meth:`__getattr__` is not called. (This is an intentional asymmetry between
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Document:meth:`__getattr__` behavior when property:meth:`get` method
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raises:exc:`AttributeError`.

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