[Python-3000] Confused about getattr() and special methods

[Thomas Wouters]

On 9/4/07, Thomas Heller <theller at ctypes.org> wrote:

> Shouldn't the __getattr__ implementation find the __iter__ method
> of the _stream instance variable?


No. For new-style classes, the special methods (that are part of the PyType
C struct) are always looked up on the class, never the instance. The class's
__getattr__ is never called. It's the class that defines behaviour, and
__getattr__ and __getattribute__ just define how to handle *instance*
attribute access.

This change is really the biggest difference between classic classes and
new-style classes, much bigger than the MRO change ;-)

-- 
Thomas Wouters <thomas at python.org>

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