.. 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

Document :meth:`__getattr__` behavior when property :meth:`get` method

raises :exc:`AttributeError`.