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[3.6] bpo-8722: Document __getattr__ behavior with AttributeError in property (GH-4754) #5542

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Merged
ncoghlan merged 1 commit into from
Feb 5, 2018
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[3.6] bpo-8722: Document __getattr__ behavior with AttributeError in property (GH-4754) #5542

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10 changes: 6 additions & 4 deletions Doc/reference/datamodel.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1443,10 +1443,12 @@ access (use of, assignment to, or deletion of ``x.name``) for class instances.

.. method:: object.__getattr__(self, name)

Called when an attribute lookup has not found the attribute in the usual places
(i.e. it is not an instance attribute nor is it found in the class tree for
``self``). ``name`` is the attribute name. This method should return the
(computed) attribute value or raise an :exc:`AttributeError` exception.
Called when the default attribute access fails with an :exc:`AttributeError`
(either :meth:`__getattribute__` raises an :exc:`AttributeError` because
*name* is not an instance attribute or an attribute in the class tree
for ``self``; or :meth:`__get__` of a *name* property raises
:exc:`AttributeError`). This method should either return the (computed)
attribute value or raise an :exc:`AttributeError` exception.

Note that if the attribute is found through the normal mechanism,
:meth:`__getattr__` is not called. (This is an intentional asymmetry between
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Documentation/2018-02-03-06-11-37.bpo-8722.MPyVyj.rst
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@@ -0,0 +1,2 @@
Document :meth:`__getattr__` behavior when property :meth:`get` method
raises :exc:`AttributeError`.