Rémi Koenig added the comment:
Sorry to bother, but I just noticed that in this same document
(http://docs.python.org/3.0/extending/newtypes.html),
PyObject_HEAD_INIT(NULL) has not been replaced by
PyVarObject_HEAD_INIT(NULL, 0).
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Python tracker
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New submission from Rémi Koenig :
The Defining New Types document for python3
(http://docs.python.org/3.0/extending/newtypes.html) cites the RO macro
(which existed in versions < 3). However, it has been removed in py3k
(cf http://wiki.python.org/moin/Py3kExtensionModules or
python
