I have completed a pure python implementation of PEP 495 and the patch is ready for review. [1] If you prefer the Github interface, please review the pull request from my cpython clone. [2] Finally, please add yourself as "nosy" to issue #24773 [3] if you would like to follow future developments. [1]: http://bugs.python.org/review/24773/#ps15654 [2]: https://github.com/python/cpython/pull/20 [3]: http://bugs.python.org/issue24773