bpo-8722: Document __getattr__ behavior with AttributeError in property (GH-4754)
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).
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 25b95c1..8420fb6 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1463,10 +1463,12 @@
.. 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