[issue17044] Implement PEP 422: Simple class initialisation hook

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


----------
versions: +Python 3.5 -Python 3.4

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17044>
_______________________________________