Since we'll be maintaining backwards compatibility with python 2.7, we can't really use python 3 only language features or reserved keywords anyways so we should probably just target the lowest common denominator (so 3.4 or 3.5 probably) and then after Python 2 is officially EOL in 2020 perhaps we can work on replacing 2.7 support with a newer Python 3 version?
Regarding common distros, I believe that these are the default py2 and py3 versions on CentOS and Ubuntu LTS: Centos 7: python = python 2, python 2.7.5, python 3.5/3.6 available via SCL Centos 6: python = python 2, python 2.6.6, python 3.5/3.6 available via SCL Ubuntu 16.04 (xenial): python = python 2, python 2.7.12, python 3.5.2 Ubuntu 18.04 (bionic): python = python 2, python 2.7.15rc1, python 3.6.7 ^^ based on variants of "docker run -it ubuntu:16.04 bin/bash -c 'apt update && apt install -y python3 && python3 --version' | tail" and "docker run -it centos:7 python --version" and such. Cheers, -Joey On Tue, Mar 19, 2019 at 11:47 AM Jordan West <jorda...@gmail.com> wrote: > On Mon, Mar 18, 2019 at 7:52 PM Michael Shuler <mich...@pbandjelly.org> > wrote: > > > On 3/18/19 9:06 PM, Patrick Bannister wrote: > > > I recommend we pick the longest supported stable release available. > That > > > would be Python 3.7, which is planned to get its last release in 2023, > > four > > > years from now. > > > - Python 3.5 was planned to get its last major release yesterday > > > - Python 3.6 is planned to get its last major release in December 2021, > > > about three years from now > > > > > > Any feedback on picking a tested Python version for cqlshlib? I'm > > inclined > > > to focus on Python 3.7 as we push toward finishing the ticket. > > > > The correct method of choosing this would be to target runtime > > functionality on the version in the latest LTS release of the likely > > most-used OS. Ubuntu 18.04 LTS comes with python-3.6.5. I would think it > > highly likely that if it runs properly on 3.6, it should run on 3.7 > > > In my experience working with a different python project recently this > isn’t the case. There are reserved keywords that were added between 3.6 and > 3.7: > https://docs.python.org/3/whatsnew/3.7.html > > Jordan > > > > > fine. Using some 3.7-only feature/syntax and making it difficult on > > people to install/use on Ubuntu LTS would be user-unfriendly. > > > > https://packages.ubuntu.com/bionic/python3 > > > > There is not a similar CentOS package search, but I see a couple docs > > say that python-3.6 is available via the SCL repository for this OS. I > > do not see a 3.7 installation noted. > > > > Shoot for the lowest common denominator in real world usage, not the > > latest release from upstream. Super strong opinion, here. > > > > -- > > Michael > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: dev-unsubscr...@cassandra.apache.org > > For additional commands, e-mail: dev-h...@cassandra.apache.org > > > > >
