I have prepared a PEP for better support of PEP 489 multiphase initialization. It makes it possible for extension types, their methods to be more specific, to access the state of the module they are defined in. conversation - https://mail.python.org/pipermail/import-sig/2015-July/001022.html PEP - https://github.com/python/peps/blob/master/pep-0573.rst Implementation - https://github.com/Traceur759/cpython/pull/4