linux-kernel - Re: [PATCH] kunit: tool: undo type subscripts for subprocess.Popen

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Date:   Tue, 2 May 2023 08:04:20 +0800
From:   David Gow <davidgow@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     brendanhiggins@...gle.com, rmoar@...gle.com,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        johannes@...solutions.net, SeongJae Park <sj@...nel.org>
Subject: Re: [PATCH] kunit: tool: undo type subscripts for subprocess.Popen

On Tue, 2 May 2023 at 02:16, 'Daniel Latypov' via KUnit Development
<kunit-dev@...glegroups.com> wrote:
>
> Writing `subprocess.Popen[str]` requires python 3.9+.
> kunit.py has an assertion that the python version is 3.7+, so we should
> try to stay backwards compatible.
>
> This conflicts a bit with commit 1da2e6220e11 ("kunit: tool: fix
> pre-existing `mypy --strict` errors and update run_checks.py"), since
> mypy complains like so
> > kunit_kernel.py:95: error: Missing type parameters for generic type "Popen"  [type-arg]
>
> Note: `mypy --strict --python-version 3.7` does not work.
>
> We could annotate each file with comments like
>   `# mypy: disable-error-code="type-arg"
> but then we might still get nudged to break back-compat in other files.
>
> This patch adds a `mypy.ini` file since it seems like the only way to
> disable specific error codes for all our files.
>
> Note: run_checks.py doesn't need to specify `--config_file mypy.ini`,
> but I think being explicit is better, particularly since most kernel
> devs won't be familiar with how mypy works.
>
> Fixes: 695e26030858 ("kunit: tool: add subscripts for type annotations where appropriate")
> Reported-by: SeongJae Park <sj@...nel.org>
> Link: https://lore.kernel.org/linux-kselftest/20230501171520.138753-1-sj@kernel.org
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> ---

Thanks for jumping on this.

Looks good to me!

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David

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