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Python Language Reference Manual
by Guido van Rossum and Fred L. Drake, Jr.
Paperback (6"x9"), 120 pages
ISBN 0954161785
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3.4.2.1 More attribute access for new-style classes

The following methods only apply to new-style classes.

__getattribute__(self, name)
Called unconditionally to implement attribute accesses for instances of the class. If the class also defines __getattr__(), the latter will not be called unless __getattribute__() either calls it explicitly or raises an AttributeError. This method should return the (computed) attribute value or raise an AttributeError exception. In order to avoid infinite recursion in this method, its implementation should always call the base class method with the same name to access any attributes it needs, for example, ‘object.__getattribute__(self, name)’.
ISBN 0954161785Python Language Reference ManualSee the print edition