How can I intercept calls to python's “magic” methods in new style classes?

For performance reasons, Python always looks in the class (and parent classes') dict for magic methods and does not use the normal attribute lookup mechanism. A workaround is to use a metaclass to automatically add proxies for magic methods at the time of class creation; I've used this technique to avoid having to write boilerplate call-through methods for wrapper classes, for example.

As of the answers to Asymmetric behavior for __getattr__, newstyle vs oldstyle classes (see also the Python docs), modifying access to "magic" methods with __getattr__ or __getattribute__ is just not possible with new-style classes. This restriction makes the interpreter much faster.

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