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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 3/5/20 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: >=20 > Adding back the context: >=20 >> - sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitco= de, ' '.join(qemu_img_args + list(args)))) >> + sys.stderr.write('qemu-img received signal %i: %s\n' % ( >> + -exitcode, ' '.join(qemu_img_args + list(args)))) >=20 >>> 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." >=20 > 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. >=20 >> For *where* I've placed the line break, this is the correct indentation. >> emacs's python mode will settle on this indent, too. >> >> https://python.org/dev/peps/pep-0008/#indentation >=20 > 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: >=20 > sys.stderr.write( > 'qemu-img received signal %i: %s\n' > % (-exitcode, ' '.join(qemu_img_args + list(args)))) >=20 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 the > opening parenthesis isn't already at like 70 characters) when we're > avoiding it in our C coding style. >=20 > There's no technical answer to this, it's a question of our preferences. >=20 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)))) >=20 > PEP-8 suggests the former, but allows both styles: >=20 > https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or-a= fter-a-binary-operator >=20 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. 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) >> (And so would be any other number of rewrites to use format codes, >> f-strings, or temporary variables to otherwise reduce the length of the >> line.) >> >> I will reluctantly admit that wrapping to 79 columns is useful in some >> contexts. The beauty of line continuations is something I have little >> desire to litigate, though. >> >> If there's some consensus on the true and beautiful way to do it, I will >> oblige -- but the thought of spinning more iterations until we find a >> color swatch we like is an unpleasant one. >=20 > I'll accept any colour for the bikeshed, as long as it's green. ;-) >=20 > Kevin >=20