An introduction to PyObjC describes the general method for translating Objective-C calls into Python calls, including the handling of pass-by-reference arguments and buffers.
This document describes where the PyObjC bindings for this framework are different from the general rule, such as mentioning APIs that are not supported or where the interface is different than expected.
All API’s in this framework have been wrapped by PyObjC.
This framework is only available when you have Xcode 3.x installed, and furthermore the framework can only be used for writing plugins and not as part of standalone applications.
This package will not work with Xcode 4, which is why the package won’t install automaticly on Mac OS X 10.8.