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from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8A138100550E; Wed, 4 Mar 2020 18:35:27 +0000 (UTC) Received: from [10.10.120.212] (ovpn-120-212.rdu2.redhat.com [10.10.120.212]) by smtp.corp.redhat.com (Postfix) with ESMTP id 91D5493500; Wed, 4 Mar 2020 18:35:26 +0000 (UTC) Subject: Re: [PATCH v6 1/9] iotests: do a light delinting To: Kevin Wolf References: <20200227000639.9644-1-jsnow@redhat.com> <20200227000639.9644-2-jsnow@redhat.com> <5c3f3029-37c3-dd97-efb7-ea244742ab51@redhat.com> <20200304111234.GB5477@dhcp-200-226.str.redhat.com> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV 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X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/4/20 6:12 AM, Kevin Wolf wrote: > Am 03.03.2020 um 22:25 hat John Snow geschrieben: >> >> >> On 2/27/20 7:59 AM, Max Reitz wrote: >>> On 27.02.20 01:06, John Snow wrote: >>>> This doesn't fix everything in here, but it does help clean up the >>>> pylint report considerably. >>>> >>>> This should be 100% style changes only; the intent is to make pylint >>>> more useful by working on establishing a baseline for iotests that we >>>> can gate against in the future. This will be important if (when?) we >>>> begin adding type hints to our code base. >=20 > I'm not sure I understand this connection. mypy doesn't care about > style. >=20 Each catches things the other doesn't -- and often getting mypy passing involves new errors in non-type-checked contexts. I have personally found it useful to *always use both tools*. So having a pylint baseline will help ensure that -- while we transition to mypy, and expect to see many errors during the transition -- we have a solid baseline from the other tool to avoid regressions with. >>>> Signed-off-by: John Snow >>>> --- >>>> tests/qemu-iotests/iotests.py | 88 ++++++++++++++++++----------------= - >>>> 1 file changed, 45 insertions(+), 43 deletions(-) >>> >>> I feel like I=E2=80=99m the wrongest person there is for reviewing a Py= thon >>> style-fixing patch, but here I am and so here I go: >> >> No, it's good. >=20 > Max can't be the wrongest person for it because that's already me. >=20 >>>> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotest= s.py >>>> index 8815052eb5..e8a0ea14fc 100644 >>>> --- a/tests/qemu-iotests/iotests.py >>>> +++ b/tests/qemu-iotests/iotests.py >>> >>> [...] >>> >>>> @@ -245,8 +243,7 @@ def qemu_nbd_early_pipe(*args): >>>> ' '.join(qemu_nbd_args + ['--fork'] + list(= args)))) >>>> if exitcode =3D=3D 0: >>>> return exitcode, '' >>>> - else: >>>> - return exitcode, subp.communicate()[0] >>>> + return exitcode, subp.communicate()[0] >>> >>> If we want to make such a change (which I don=E2=80=99t doubt we want),= I think >>> it should be the other way around: Make the condition =E2=80=9Cexitcode= !=3D 0=E2=80=9D, >>> so the final return is the return for the successful case. (Just >>> because I think that=E2=80=99s how we usually do it, at least in the qe= mu code?) >>> >>> [...] >>> >> >> Yes, makes sense. I was behaving a little more mechanically. >=20 > Here and... >=20 This check can be disabled I think legitimately. >>>> @@ -756,12 +750,13 @@ def assert_block_path(self, root, path, expected= _node, graph=3DNone): >>>> assert node is not None, 'Cannot follow path %s%s' % (roo= t, path) >>>> =20 >>>> try: >>>> - node_id =3D next(edge['child'] for edge in graph['edg= es'] \ >>>> - if edge['parent'] =3D=3D= node['id'] and >>>> - edge['name'] =3D=3D c= hild_name) >>>> + node_id =3D next(edge['child'] for edge in graph['edg= es'] >>>> + if edge['parent'] =3D=3D node['id'] an= d >>>> + edge['name'] =3D=3D child_name) >>> >>> I don=E2=80=99t mind the if alignment, but I do mind not aligning the t= hird line >>> to the =E2=80=9Cedge=E2=80=9D above it (i.e. the third line is part of = the condition, so >>> I=E2=80=99d align it to the =E2=80=9Cif=E2=80=9D condition). >>> >>> But then again it=E2=80=99s nothing new that I like to disagree with co= mmonly >>> agreed-upon Python coding styles, so. >>> >>> [...] >>> >> >> OK, that can be addressed by highlighting the sub-expression with >> parentheses: >> >> node_id =3D next(edge['child'] for edge in graph['edges'] >> if (edge['parent'] =3D=3D node['id'] and >> edge['name'] =3D=3D child_name)) >=20 > ...here I must say that while I think Max's suggestions feel like an > improvement to me over the patch, I actually like the current code best > in both cases. >=20 This check I think *should* stay enabled to catch bad indenting, even if it comes out looking subpar (subjective) in this one instance. We might be able to fine-tune the indent checks, but I think for one debated instance ... it's not important. > In fact, after scanning your patch, I feel it's actually the majority of > changes that pylint wants that aren't an improvement... Maybe this just > underlines the fact that I am the wrongest person to review such patches > and not Max. Though I'm surprised that I'm generally not the person who > introduces the code violating the rules, and I don't have the impression > in this thread that anyone is eager to defend pylint's opinion. >=20 > Now I ran pylint myself and it prints some even more ridiculous warnings > like variable names being too short for its liking. I guess this means > that if we want to run it without warnings or errors, we need to use a > config file anyway to disable the worst parts. >=20 > And if we have a config file anyway, maybe we can more selectively > enable the checks that we actually want? >=20 > Kevin >=20 See patch 9 for said conf file. I did disable most of the silly ones. With this patch (and a few others later on) pylint is silent and can be used for gating. I do think that's worth a few indent styles that you feel are suboptimal. --js