Re: Python 3.5 EOL; when can require 3.6?

[Markus Armbruster]

Thomas Huth <thuth@redhat.com> writes:

> On 16/09/2020 16.00, Thomas Huth wrote:
>> On 16/09/2020 14.30, Peter Maydell wrote:
>>> On Wed, 16 Sep 2020 at 08:43, Markus Armbruster <armbru@redhat.com> wrote:
>>>> We require Python 3.5.  It will reach its "end of life" at the end of
>>>> September 2020[*].  Any reason not to require 3.6 for 5.2?  qemu-iotests
>>>> already does for its Python parts.
>> [...]
>>> The default should be
>>> "leave the version dependency where it is", not "bump the version
>>> dependency as soon as we can".
>> 
>> OTOH, if none of our supported build systems uses python 3.5 by default
>> anymore, it also will not get tested anymore, so bugs might creep in,
>> which will of course end up in a bad experience for the users, too, that
>> still try to build with such an old version. So limiting the version to
>> the level that we also test is IMHO very reasonable.
>> 
>> Let's have a look at the (older) systems that we support and the python
>> versions according to repology.org:
>> 
>> - RHEL7 / CentOS 7 : 3.6.8
>> - Ubuntu 18.04 (Bionic) : >= 3.6.5
>> - openSUSE Leap 15.0 : >= 3.6.5
>> - OpenBSD Ports : >= 3.7.9
>> - FreeBSD Ports : >= 3.5.10 - but there is also 3.6 or newer
>> - Homebrew : >= 3.7.9
>> 
>> ... so I think it should be fine to retire 3.5 nowadays.
>
> Sorry, I forgot to check Debian. If I got that right, Debian 9 still
> uses Python 3.5 by default. So I guess that means we can not deprecate
> Python 3.5 yet?

Discussed before:

    Subject: Re: [PATCH] qapi: Fix code generation with Python 3.5
    Date: Sat, 18 Jan 2020 07:54:18 +0100
    Message-ID: <87lfq5s19h.fsf@dusky.pond.sub.org>
    https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg03855.html

Short version: Debian != Debian LTS.  We support Debian until EOL, not
LTS.  Debian 9 reached EOL in July.