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From: Peter Maydell <peter.maydell@linaro.org>
Date: Mon, 15 Oct 2018 17:55:27 +0100
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Subject: Re: [Qemu-devel] [RFC] Require Python 3 for building QEMU
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To: Markus Armbruster <armbru@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Qemu-block <qemu-block@nongnu.org>, QEMU Developers <qemu-devel@nongnu.org>, Stefan Hajnoczi <stefanha@redhat.com>, Cleber Rosa <crosa@redhat.com>, Fam Zheng <famz@redhat.com>, Max Reitz <mreitz@redhat.com>, =?UTF-8?B?QWxleCBCZW5uw6ll?= <alex.bennee@linaro.org>, =?UTF-8?Q?Philippe_Mathieu=2DDaud=C3=A9?= <f4bug@amsat.org>

On 15 October 2018 at 17:33, Markus Armbruster <armbru@redhat.com> wrote:
> Kevin Wolf <kwolf@redhat.com> writes:
>
>> Am 15.10.2018 um 12:02 hat Peter Maydell geschrieben:
>> It's easier to port stuff to Python 3 though than making them work with
>> both. I think Eduardo's RFC is in part motivated by a patch from
>> Philippe that converted something in iotests to work with Python 3,
>> passed review and then turned out to break Python 2.
>
> Seconded.  This is not about the cost of maintaining existing
> compatibility gunk, it's about the extra effort to first get the
> remainder to work with 2 and 3, only to throw away 2 a few months later.
>
> I propose we permit ourselves to port stuff that isn't essential to
> building QEMU straight to 3 instead.  This includes iotests.

No particular objection, as long as nothing run via 'make'
or 'make check' needs Python 3.

I also suspect "a few months" is an underestimate. My guess
would be we're going to want to keep Python 2 support for
at least the next year, maybe two.

thanks
-- PMM