'TStringMissingPlaceholders' doesn't have an error code assigned (test_all_pyflakes_messages_have_flake8_codes_assigned)

[befeleme]

how did you install flake8?

I try to build flake8 as RPM.

unmodified output of flake8 --bug-report

N/A

describe the problem

Hi, I'm trying to build pyflakes and flake8 with Python 3.14.0b2 in Fedora Linux.
With some compat bits gotten from both repositories, I'm down to one failing test:

____________ test_all_pyflakes_messages_have_flake8_codes_assigned _____________

    def test_all_pyflakes_messages_have_flake8_codes_assigned():
        """Verify all PyFlakes messages have error codes assigned."""
        messages = {
            name
            for name, obj in vars(pyflakes.messages).items()
            if name[0].isupper() and obj.message
        }
>       assert messages == set(pyflakes_shim.FLAKE8_PYFLAKES_CODES)
E       AssertionError: assert {'AssertTuple...rgument', ...} == {'AssertTuple...rgument', ...}
E         
E         Extra items in the left set:
E         'TStringMissingPlaceholders'
E         
E         Full diff:
E           {
E               'AssertTuple',...
E         
E         ...Full output truncated (46 lines hidden), use '-vv' to show

tests/unit/test_pyflakes_codes.py:18: AssertionError

[sigmavirus24]

What versions are you combining to build this? Seems like you're using incompatible versions

[befeleme]

It may well be and I'll try to update to the latest in both cases.

I took a look at main's FLAKE8_PYFLAKES_CODES and haven't found TStringMissingPlaceholders there, so it looked like a genuine case:
https://github.com/PyCQA/flake8/blob/main/src/flake8/plugins/pyflakes.py#L16

[befeleme]

So, I've got pyflakes 3.3.2 with this commit added: PyCQA/pyflakes#842 and flake8 7.2.0 (alternatively with this commit: 019424b), in all cases the same test fails.

[sigmavirus24]

You are attempting to package an unreleased version of pyflakes with an older version of flake8. With pyflakes unreleased and 3.14 not yet stable enough to justify one, flake8 doesn't support this yet. Flake8 also has nominal 3.14 support but not complete support

[sigmavirus24]

To further clarify, Flake8 doesn't add support for pyflakes versions until they're released, so we're not going to merge anything that would solely support pyflakes master

[befeleme]

I should have started with a context: I'm working on bringing Python 3.14 as a main Python to Fedora Linux very soon (the beta 2 has been released this week, no more new features can be added at this point). As a part of that effort I try to rebuild every package with this Python version in our build system. Since this project doesn't test with Python 3.14 yet, I thought a heads up about what's missing yet could be helpful. If it isn't, apologies for the noise.

[befeleme]

To further clarify, Flake8 doesn't add support for pyflakes versions until they're released, so we're not going to merge anything that would solely support pyflakes master

Understood.

[sigmavirus24]

Features can still be removed if they haven't stabilized and bugs have been fixed around parsing and AST prior to the first RC that have meant more work here.

Also, this wasn't a head's up, just an issue with almost no details reporting a bug in unreleased software in an incompatible and unsupported configuration.

I believe our contribution documentation explicitly explains why this is unwelcome behavior and unhelpful.

[befeleme]

I'm sorry - I'll strive to do better next time. I understand your position. I took a huge shortcut, being immersed in hundreds of test failures, and forgot that's not the only perspective to consider.
I'll close this issue and skip the test in my environment for now.

[asottile]

not only did you take a huge unsupported shortcut you then decided to waste our time too. please use this as a learning experience in what not to do