Re: [Python-ideas] allow line break at operators

References	(12 earlier) <4E43D2F2.1090004@mrabarnett.plus.com> <CAB4yi1NDXbROzgf6SGY7P=LWC1pb3DDOZVF6B-fWs_-O3jr8qw@mail.gmail.com> <CAA0gF6razhggOkohNsX2M=s=DQOk=_R3afvGMfBrZBgERvi3zw@mail.gmail.com> <CABicbJLxSa2t75YZ3NX6RT_FiE8hdZdO5yDRw0Yv+_FvF093Xw@mail.gmail.com> <CAGu0Ant4csRNhteY=S=hm+Q0uuSFJoLSCErj5NMG3psGw8eohQ@mail.gmail.com>
From	Devin Jeanpierre <jeanpierreda@gmail.com>
Date	2011-08-11 17:06 -0400
Subject	Re: [Python-ideas] allow line break at operators
Newsgroups	comp.lang.python
Message-ID	<mailman.2190.1313096861.1164.python-list@python.org> (permalink)

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> Right now you do not need to indent continuation lines. So in order to disambiguate you would need to enforce indentation for continuations, but for backward compatibility that would only be required when not using parentheses or backslashes. Ick. Can blank lines or comment lines appear between a line and its continuation? That's allowed now as well.

Eek no. If I was suggesting anything, it would have been a third form
of continuation: collapsing subsequent extra-indented lines. This is
never ambiguous. (This could be done in such a way as to permit
comments, namely, by doing it to the tokenstream rather than to the
actual text)

Devin

On Thu, Aug 11, 2011 at 4:45 PM, Bruce Leban <bruce@leapyear.org> wrote:
>
> On Thu, Aug 11, 2011 at 12:24 PM, Devin Jeanpierre <jeanpierreda@gmail.com> wrote:
>>
>> Javascript also lets you break lines. For example, this does what you want:
>>
>>     return 1
>>         + 5
>>
>> Whereas this does not
>>
>>     return
>>         1 + 5
>>
>> Of course, Python would have no such problem, because you could make both cases unambiguous due to the indent.
>>
>> Devin
>>
> Note that this is already valid and is not a continuation line:
>
> return 1
> +5
>
> Right now you do not need to indent continuation lines. So in order to disambiguate you would need to enforce indentation for continuations, but for backward compatibility that would only be required when not using parentheses or backslashes. Ick. Can blank lines or comment lines appear between a line and its continuation? That's allowed now as well.
> Now allowing line breaks *after* operators would be unambiguous and would not require new indentation rules. When a line ends with an operator, it's clearly incomplete (so no fear the reader will think the statement has ended unlike the above case) and it's a syntax error today:
>
> return 1 +
>     5
> x = y > 0 and
>    y < 10
>
> This code is not valid today without parens or \ regardless of indentation. I'm +0 on this. I'd use it but does it really add enough convenience?
> --- Bruce
> Follow me: http://www.twitter.com/Vroo http://www.vroospeak.com

Thread

Re: allow line break at operators Yingjie Lan <lanyjie@yahoo.com> - 2011-08-09 23:05 -0700
  Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-10 18:32 +1000
    Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 09:39 +0100
    Re: allow line break at operators Dan Sommers <dan@tombstonezero.net> - 2011-08-10 09:56 +0000
      Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 00:44 +1000
    Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 11:26 +0100
      Re: allow line break at operators Duncan Booth <duncan.booth@invalid.invalid> - 2011-08-10 12:25 +0000
        Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 13:42 +0100
        Re: allow line break at operators Yingjie Lan <lanyjie@yahoo.com> - 2011-08-10 05:58 -0700
        Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 15:45 +0100
        Re: allow line break at operators Yingjie Lan <lanyjie@yahoo.com> - 2011-08-10 06:19 -0700
        Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 16:56 +0100
          Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-10 17:55 +0000
            Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-11 07:51 +1000
              Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 23:42 +0100
                Re: allow line break at operators Neil Cerutti <neilc@norwich.edu> - 2011-08-11 14:40 +0000
              Re: Python & Sullivan Tim Chase <python.list@tim.thechases.com> - 2011-08-10 18:26 -0500
                Re: Python & Sullivan Ben Finney <ben+python@benfinney.id.au> - 2011-08-11 10:57 +1000
              Re: Python & Sullivan Chris Angelico <rosuav@gmail.com> - 2011-08-11 00:54 +0100
              Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-11 04:59 +0000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-11 15:56 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-11 21:19 +0000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 00:58 +0100
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-12 11:40 +1000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 08:09 +0100
                Re: allow line break at operators Neil Cerutti <neilc@norwich.edu> - 2011-08-12 12:57 +0000
                Re: allow line break at operators Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-08-12 14:54 +0200
                Re: allow line break at operators Tim Roberts <timr@probo.com> - 2011-08-14 22:22 -0700
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-12 18:59 +1000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-12 20:40 +1000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-12 21:16 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 16:33 +0000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 22:29 +1000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 22:40 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-11 21:19 +0000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-11 21:19 +0000
                Re: allow line break at operators Ethan Furman <ethan@stoneleaf.us> - 2011-08-11 15:43 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 06:34 +0000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 08:20 +0100
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-12 08:33 -0700
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 20:52 +0100
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 16:33 +0000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-12 20:39 +1000
                Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-12 10:03 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 18:37 +0000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 16:33 +0000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 21:01 +0100
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 21:06 +0000
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-12 08:26 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 16:33 +0000
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-12 10:57 -0700
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 21:09 +0100
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 21:06 +0000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-13 08:39 +1000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-12 23:50 +0100
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-13 09:19 +1000
                Re: allow line break at operators Tim Chase <python.list@tim.thechases.com> - 2011-08-12 18:53 -0500
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-13 00:39 +0000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-13 10:57 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-13 02:34 +0000
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-13 18:50 -0700
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-13 19:07 -0700
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-13 18:59 -0700
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-14 17:10 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-14 08:07 +0000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-14 19:25 +1000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-15 00:26 +1000
                Re: allow line break at operators Roy Smith <roy@panix.com> - 2011-08-14 11:35 -0400
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-15 03:24 +1000
                Re: Re: allow line break at operators Dave Angel <davea@ieee.org> - 2011-08-14 17:46 -0400
                Re: allow line break at operators Roy Smith <roy@panix.com> - 2011-08-14 18:46 -0400
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-15 00:02 +0100
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-14 16:39 +0100
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-15 03:26 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-14 19:01 +0000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-15 11:54 +1000
                Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-14 19:10 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-15 04:28 +0000
                Re: allow line break at operators Tim Chase <python.list@tim.thechases.com> - 2011-08-15 06:40 -0500
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-15 23:30 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-15 16:32 +0000
                Re: allow line break at operators alex23 <wuwei23@gmail.com> - 2011-08-15 21:13 -0700
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-15 21:37 -0700
                Re: allow line break at operators alex23 <wuwei23@gmail.com> - 2011-08-15 23:49 -0700
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-16 11:56 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-15 04:28 +0000
                Re: allow line break at operators Terry Reedy <tjreedy@udel.edu> - 2011-08-15 03:31 -0400
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-15 14:21 -0700
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-15 09:27 +0100
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-14 09:34 +0100
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-14 19:27 +1000
                Re: allow line break at operators Ethan Furman <ethan@stoneleaf.us> - 2011-08-14 03:51 -0700
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-14 12:59 +0100
                Re: allow line break at operators Teemu Likonen <tlikonen@iki.fi> - 2011-08-14 12:46 +0300
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-14 19:01 +0000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-14 19:01 +0000
                Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-14 01:44 -0700
                Re: allow line break at operators Teemu Likonen <tlikonen@iki.fi> - 2011-08-16 07:04 +0300
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-13 19:18 -0700
                Re: allow line break at operators Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-08-13 13:19 +1200
                Re: allow line break at operators Johann Hibschman <jhibschman+usenet@gmail.com> - 2011-08-15 08:27 -0500
                Re: allow line break at operators Roy Smith <roy@panix.com> - 2011-08-15 09:41 -0400
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-15 15:16 +0100
                Re: allow line break at operators Roy Smith <roy@panix.com> - 2011-08-15 20:34 -0400
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-16 01:37 +0100
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-16 00:28 +1000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-15 15:42 +0100
                Re: allow line break at operators Roy Smith <roy@panix.com> - 2011-08-15 20:30 -0400
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-16 00:39 +0000
                Re: allow line break at operators Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-08-16 12:43 +1200
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-15 16:32 +0000
                Re: allow line break at operators Ethan Furman <ethan@stoneleaf.us> - 2011-08-12 13:35 -0700
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 21:06 +0000
                Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-13 08:03 +1000
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-12 22:14 +0000
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-13 08:36 +1000
                Re: allow line break at operators Terry Reedy <tjreedy@udel.edu> - 2011-08-12 20:15 -0400
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-13 00:44 +0000
                Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-08-13 18:25 -0700
                Re: allow line break at operators Ben Finney <ben+python@benfinney.id.au> - 2011-08-13 08:12 +1000
                RE: allow line break at operators "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2011-08-16 15:51 -0400
                RE: allow line break at operators "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2011-08-16 15:26 -0400
                Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-16 20:19 +0000
                Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-16 21:05 +0100
            Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 10:32 +1000
              Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-11 01:47 +0100
              Re: allow line break at operators Seebs <usenet-nospam@seebs.net> - 2011-08-11 04:59 +0000
        Re: allow line break at operators Yingjie Lan <lanyjie@yahoo.com> - 2011-08-10 19:52 -0700
          Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 14:18 +1000
            Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-11 00:50 -0700
            Re: allow line break at operators Vito 'ZeD' De Tullio <zak.mc.kraken@libero.it> - 2011-08-11 12:21 +0200
        Re: allow line break at operators Yingjie Lan <lanyjie@yahoo.com> - 2011-08-10 19:58 -0700
        Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-10 21:16 -0700
        Re: allow line break at operators Chris Rebert <clp2@rebertia.com> - 2011-08-10 22:07 -0700
        Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-11 09:24 +0100
        Re: allow line break at operators MRAB <python@mrabarnett.plus.com> - 2011-08-11 14:03 +0100
        Re: [Python-ideas] allow line break at operators Matt Joiner <anacrolix@gmail.com> - 2011-08-12 00:28 +1000
          Re: [Python-ideas] allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-12 12:32 +1000
        Re: [Python-ideas] allow line break at operators Jakob Bowyer <jkbbwr@gmail.com> - 2011-08-11 16:42 +0100
        Re: [Python-ideas] allow line break at operators Daniel Greenfeld <pydanny@gmail.com> - 2011-08-11 10:04 -0700
        Re: [Python-ideas] allow line break at operators Paul Colomiets <paul@colomiets.name> - 2011-08-11 22:17 +0300
        Re: [Python-ideas] allow line break at operators Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-08-11 17:06 -0400
        Re: [Python-ideas] allow line break at operators Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-08-11 17:29 -0400
        Re: [Python-ideas] allow line break at operators Jim Jewett <jimjjewett@gmail.com> - 2011-08-11 17:39 -0400
        Re: [Python-ideas] allow line break at operators Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-08-11 18:29 -0400
        Re: [Python-ideas] allow line break at operators Matt Joiner <anacrolix@gmail.com> - 2011-09-02 15:33 +1000
          Re: [Python-ideas] allow line break at operators Roy Smith <roy@panix.com> - 2011-09-03 12:59 -0400
        Re: [Python-ideas] allow line break at operators "Stephen J. Turnbull" <stephen@xemacs.org> - 2011-09-02 16:28 +0900
        Re: [Python-ideas] allow line break at operators Guido van Rossum <guido@python.org> - 2011-09-02 12:30 -0700
        Re: [Python-ideas] allow line break at operators "Stephen J. Turnbull" <stephen@xemacs.org> - 2011-09-03 13:38 +0900
        Re: [Python-ideas] allow line break at operators "Stephen J. Turnbull" <stephen@xemacs.org> - 2011-09-03 15:10 +0900
        Re: [Python-ideas] allow line break at operators Terry Reedy <tjreedy@udel.edu> - 2011-09-03 15:01 -0400
        Re: [Python-ideas] allow line break at operators ron3200 <ron3200@gmail.com> - 2011-09-04 10:22 -0500
          Re: allow line break at operators rantingrick <rantingrick@gmail.com> - 2011-09-04 11:08 -0700
      Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 00:37 +1000
        Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-10 16:13 +0100
        Re: allow line break at operators Ian Kelly <ian.g.kelly@gmail.com> - 2011-08-10 09:16 -0600
          Re: allow line break at operators Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-11 09:32 +1000
            Re: allow line break at operators Chris Angelico <rosuav@gmail.com> - 2011-08-11 00:55 +0100

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