@ronaldoussoren

* This change currently works for all CPython. If you are using this pattern then you probably want to be using PyType_FromSpec rather than having a static PyTypeObject as discussed in PEP384: https://www.python.org/dev/peps/pep-0384. In general, extensions should all be using PyType_FromSpec rather than static PyTypeObjects.

* As mentioned by Erik Bray in the e-mail thread, the usage of a static PyTypeObject with a PyVarObject_HEAD_INIT requires a compile-time constant. This causes problems cross-compatibility problems, especially with Windows. You can read more here: http://iguananaut.net/blog/programming/windows-data-import.html

In general, this pattern is just pervasive. It causes cross-compatibility issues, it can cause users to forget calling PyType_Ready on a type and we are better off without it.

Again, please read the mail thread. Everything that I'm saying here is all discussed there.