Re: [Buildroot] [External] - Re: Python pyc only and problem with scripts

From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Vincent Fazio <vfazio@xes-inc.com>
Cc: Federico Pellegrin <fede@evolware.org>,
	Marcus Hoffmann <marcus.hoffmann@othermo.de>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	buildroot <buildroot@buildroot.org>
Subject: Re: [Buildroot] [External] - Re: Python pyc only and problem with scripts
Date: Tue, 9 Aug 2022 18:35:50 +0200	[thread overview]
Message-ID: <20220809163550.GF3168@scaer> (raw)
In-Reply-To: <PH1P110MB1603D8E2804E4F31B878B6039F629@PH1P110MB1603.NAMP110.PROD.OUTLOOK.COM>

Vincent, All,

On 2022-08-09 12:54 +0000, Vincent Fazio spake thusly:
[--SNIP--]
> That said,  if you read PEP 3147, it's pretty clear that sourceless distributions are "legacy",
> so anything we do is likely outside of the scope of what upstream intends to support. It may still be
> worth having a discussion about long term support options

Ref;
    https://peps.pythondiscord.com/pep-3147/#case-4-legacy-pyc-files-and-source-less-imports

    ---8<---
    Case 4: legacy pyc files and source-less imports

    Python will ignore all legacy pyc files when a source file exists
    next to it. In other words, if a foo.pyc file exists next to the
    foo.py file, the pyc file will be ignored in all cases

    In order to continue to support source-less distributions though,
    if the source file is missing, Python will import a lone pyc file
    if it lives where the source file would have been.
    ---8<---

Vincent, Thomas, and I have had a quick discussion on IRC, which boils
down to reading the PEP3147 in two (or three) ways:

  - Vincent: legacy (pyc files and source-less imports)
    => both pyc files on their own *and* source-less distributions
       are considered legacy

  - Yann: (legacy pyc files) and (source-less imports)
    => only pyc files on thier own are legacy; source-less distribution
       is still supported

  - Thomas: in-between
    => "Because we can't break the world overnight, we continue to
       support this, but it sucks"

So, Vincent has opened an issue to ask for clarification:
    https://github.com/python/cpython/issues/95827

Regards,
Yann E. MORIN.

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