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(TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jAHnq-0006tr-9M for qemu-devel@nongnu.org; Fri, 06 Mar 2020 13:34:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583519669; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=BfwwFmbejcrgVH/lJHQplE3tlfvLzUnUA7qeySx87FI=; b=g85BHdIKaDrrq+Cd9nZwbxzcv1T3y5AGqUA56ad63JE4BM9Q6XyuXptpfpbDFBK2c6ppjg 0V6HVT8vkhcAWavGxoFPh5QFSMwCyJI9gdaoolw/8IQkBdX0Bo2ez14TvKjP4/TUcMqiqw OwS5R66+gBRiXECWA8Z6fLAOZCdWcV8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-152-7q8Z4s6dMqqJzyBtmJQajA-1; Fri, 06 Mar 2020 13:34:26 -0500 X-MC-Unique: 7q8Z4s6dMqqJzyBtmJQajA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 26DA9800D50; Fri, 6 Mar 2020 18:34:25 +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 7890A91D94; Fri, 6 Mar 2020 18:34:23 +0000 (UTC) Subject: Re: [PATCH v7 06/10] iotests: limit line length to 79 chars To: Kevin Wolf References: <20200304213818.15341-1-jsnow@redhat.com> <20200304213818.15341-7-jsnow@redhat.com> <20200305115548.GA5363@linux.fritz.box> <20200306101425.GC7240@linux.fritz.box> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV 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Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-block@nongnu.org, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , qemu-devel@nongnu.org, Max Reitz , armbru@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/6/20 5:14 AM, Kevin Wolf wrote: > Am 05.03.2020 um 19:25 hat John Snow geschrieben: >> On 3/5/20 6:55 AM, Kevin Wolf wrote: >>> Am 05.03.2020 um 00:14 hat John Snow geschrieben: >>>> >>>> >>>> On 3/4/20 4:58 PM, Philippe Mathieu-Daud=C3=A9 wrote: >>> >>> Adding back the context: >>> >>>> - sys.stderr.write('qemu-img received signal %i: %s\n' % (-exit= code, ' '.join(qemu_img_args + list(args)))) >>>> + sys.stderr.write('qemu-img received signal %i: %s\n' % ( >>>> + -exitcode, ' '.join(qemu_img_args + list(args)))) >>> >>>>> Do we want to indent Python like C and align argument below opening >>>>> parenthesis? Except when using sys.stderr.write() you seem to do it. >>>> >>>> This isn't an argument to write, it's an argument to the format string= , >>>> so I will say "no." >>> >>> The argument to write() is an expression. This expression contains the = % >>> operator with both of its operands. It's still fully within the >>> parentheses of write(), so I think Philippe's question is valid. >>> >>>> For *where* I've placed the line break, this is the correct indentatio= n. >>>> emacs's python mode will settle on this indent, too. >>>> >>>> https://python.org/dev/peps/pep-0008/#indentation >>> >>> The PEP-8 examples are not nested, so it's not completely clear. I >>> wonder if hanging indents wouldn't actually mean the following because >>> if you line wrap an argument list (which contains the whole % >>> expression), you're supposed to have nothing else on the line of the >>> opening parenthesis: >>> >>> sys.stderr.write( >>> 'qemu-img received signal %i: %s\n' >>> % (-exitcode, ' '.join(qemu_img_args + list(args)))) >>> >> >> This is fine too. >> >>> But anyway, I think the question is more whether we want to use hanging >>> indents at all (or at least if we want to use it even in cases where th= e >>> opening parenthesis isn't already at like 70 characters) when we're >>> avoiding it in our C coding style. >>> >>> There's no technical answer to this, it's a question of our preferences= . >>> >> >> Maybe it is ambiguous. Long lines are just ugly everywhere. >> >>>> (If anyone quotes Guido's belittling comment in this email, I will >>>> become cross.) >>>> >>>> >>>> But there are other places to put the line break. This is also >>>> technically valid: >>>> >>>> sys.stderr.write('qemu-img received signal %i: %s\n' >>>> % (-exitcode, ' '.join(qemu_img_args + list(args)))) >>>> >>>> And so is this: >>>> >>>> sys.stderr.write('qemu-img received signal %i: %s\n' % >>>> (-exitcode, ' '.join(qemu_img_args + list(args)))= ) >>> >>> PEP-8 suggests the former, but allows both styles: >>> >>> https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or= -after-a-binary-operator >>> >> >> So in summary: >> >> - Avoid nested hanging indents from format operators >> - Use a line break before the % format operator. >> - OPTIONALLY(?), use a hanging indent for the entire format string to >> reduce nesting depth. >=20 > Yes, though I don't think of it as a special case for format strings. So > I would phrase it like this: >=20 > - Don't use hanging indent for any nested parentheses unless the outer > parentheses use hanging indents, too. > - Use a line break before binary operators. > - OPTIONALLY, use a hanging indent for the top level(s) to reduce > nesting depth. >=20 > The first one is the only rule that involves some interpretation of > PEP-8, the rest seems to be its unambiguous recommendation. >=20 > Anyway, so I would apply the exact same rules to the following (imagine > even longer expressions, especially the last example doesn't make sense > with the short numbers): >=20 > * bad: > really_long_function_name(-1234567890 + 987654321 * ( > 1337 / 42)) >=20 > * ok: > really_long_function_name(-1234567890 + 987654321 > * (1337 / 42)) >=20 > * ok: > really_long_function_name( > -1234567890 + 987654321 > * (1337 / 42)) >=20 > * ok: > really_long_function_name( > -1234567890 + 987654321 * ( > 1337 / 42)) >=20 >> e.g., either this form: >> (using a line break before the binary operator and nesting to the >> argument level) >> >> write('hello %s' >> % (world,)) >> >> >> or optionally this form if it buys you a little more room: >> (using a hanging indent of 4 spaces and nesting arguments at that level) >> >> write( >> 'hello %s' >> % ('world',)) >> >> >> but not ever this form: >> (Using a hanging indent of 4 spaces from the opening paren of the format >> operand) >> >> write('hello %s' % ( >> 'world',)) >> >> >> >> yea/nea? >> >> (Kevin, Philippe, Markus, Max) >=20 > Looks good to me. >=20 > Kevin >=20 Great, thanks! I am sorry for having been so tetchy. I appreciate the reviews. --js