linux-kernel - Re: [PATCH] kunit: tool: fix pre-existing python type annotation errors

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Date:   Fri, 30 Oct 2020 10:56:39 +0800
From:   David Gow <davidgow@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] kunit: tool: fix pre-existing python type annotation errors

On Thu, Oct 22, 2020 at 6:08 AM Daniel Latypov <dlatypov@...gle.com> wrote:
>
> The code uses annotations, but they aren't accurate.
> Note that type checking in python is a separate process, running
> `kunit.py run` will not check and complain about invalid types at
> runtime.
>
> Fix pre-existing issues found by running a type checker
> $ mypy *.py
>
> All but one of these were returning `None` without denoting this
> properly (via `Optional[Type]`).
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> ---

I'm not going to pretend to really understand python annotations
completely, but this all seems correct from what I know of the code,
and I was able to install mypy and verify the issues were fixed.

Clearly, if we're going to have type annotations here, we should be
verifying the code against them. Is there a way we could get python
itself to verify this code when the script runs, rather than have to
use mypy as a tool to verify it separately? Otherwise, maybe we can
run it automatically from the kunit_tool_test.py unit tests or
something similar?

Regardless, this is

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

Cheers,
-- David