Hi, > If written to use python 3, I hope it will use all the new features of > python 3.4 moving forward.
The spec adds Python 3 support, but it keeps Python 2 support. It's too early to drop Python 2, Nova is deployed everywhere with Python 2. > For example, argument annotations, coroutines, asyncio, etc. Argument annotations are not used in practice :-( There is a PEP under review which targets the future Python 3.5 version: https://www.python.org/dev/peps/pep-0484/ I'm working actively on asyncio. I wrote a spec to replace eventlet with asyncio: https://review.openstack.org/#/c/153298/ superseded by: https://review.openstack.org/#/c/164035/ For OpenStack, I ported asyncio to Python 2: it's the Trollius project: https://trollius.readthedocs.org/ I would also prefer to be able to use new shiny Python 3 features, but it's not possible yet. We have to move step by step. There is no choice like "Python 2 only" or "Python 3 only with new Python 3 features". Changes must be done incrementally in OpenStack. We all know that. > At my last workplace, we tried to make our project python2 and 3 > compatible (ie, you could run it under 2.7 or 3.3+) but this was > the worst of all worlds. Does it mean that you are against the whole spec? I don't know any Python project in the wild which was really ported to Python 3: drop Python 2 support at the same time. Supporting only Python 3 only slowly becomes a good choice for *new* projects. All projects are ported by adding Python 3 support in addition to Python 2 support. The six module is a great module to limit changes on the source code. See my early draft patch to port nova to Python 3: https://github.com/haypo/nova/commit/bad54bc2b278c7c7cb7fa6cc73d03c70138bd89d Joe Goron wrote "I like how the sha1 starts with 'bad'. Overall that is a pretty small patch." ;-) Victor __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
