Re: Python 3.2 has some deadly infection

References	(16 earlier) <87sinju1hf.fsf@elektro.pacujo.net> <mailman.10757.1401996534.18130.python-list@python.org> <8738fjumy8.fsf@elektro.pacujo.net> <5390f997$0$29978$c3e8da3$5496439d@news.astraweb.com> <87ioof53z1.fsf@elektro.pacujo.net>
Date	2014-06-06 09:39 +1000
Subject	Re: Python 3.2 has some deadly infection
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.10787.1402011598.18130.python-list@python.org> (permalink)

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On Fri, Jun 6, 2014 at 9:30 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Steven D'Aprano <steve+comp.lang.python@pearwood.info>:
>
>>> "Can be replaced" by who? By the Python developers? By me? By random
>>> library calls?
>>
>> By you. sys.stdout and friends are writable. Any code you call may
>> have replaced them with another file-like object, and you should
>> honour that.
>
> I can of course overwrite even sys and os and open and all. That hardly
> merits mentioning in the API documentation.
>
> What I'm afraid of is that the Python developers are reserving the right
> to remove the buffer and detach attributes from the standard streams in
> a future version. That would be terrible.
>
> If it means some other module is allowed to commandeer the standard
> streams, that would be bad as well.
>
> Worst of all, I don't know why the caveat had to be there.
>
> Or is it maybe because some python command line options could cause
> buffer and detach not to be there? That would explain the caveat, but
> still would be kinda sucky.

It's more that replacng sys.std* is considered reasonably normal
(unlike, say, replacing sys.float_info, which would be a weird thing
to do); and you could replace them with something that doesn't have
those attributes. If you're running a top-level script and you never
import anything that changes the streams, you should be able to depend
on those always being there.

ChrisA

Thread

Python 3.2 has some deadly infection Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-31 17:10 +0100
  Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-05-31 22:55 +0300
  Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-01 02:26 +0000
    Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-01 12:43 +1000
    Re: Python 3.2 has some deadly infection Tim Delaney <timothy.c.delaney@gmail.com> - 2014-06-02 08:54 +1000
      Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-02 01:14 +0000
        Re: Python 3.2 has some deadly infection Tim Delaney <timothy.c.delaney@gmail.com> - 2014-06-02 12:23 +1000
          Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-01 19:46 -0700
        Re: Python 3.2 has some deadly infection Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2014-06-02 07:45 +0000
        Re: Python 3.2 has some deadly infection Tim Delaney <timothy.c.delaney@gmail.com> - 2014-06-02 19:02 +1000
        Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-02 19:14 +1000
        Re: Python 3.2 has some deadly infection Robin Becker <robin@reportlab.com> - 2014-06-02 12:10 +0100
          Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-03 16:34 +0000
            Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-04 02:43 +1000
        Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-02 17:34 -0400
          Re: Python 3.2 has some deadly infection Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-06-03 17:16 +1200
            Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-03 02:21 -0400
            Re: Python 3.2 has some deadly infection Robin Becker <robin@reportlab.com> - 2014-06-03 15:18 +0100
              Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-04 13:08 +0000
                Re: Python 3.2 has some deadly infection Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-06-05 14:01 +1200
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 10:16 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-05 17:30 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 11:05 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-05 18:36 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 12:53 +0300
                Re: Python 3.2 has some deadly infection wxjmfauth@gmail.com - 2014-06-05 05:43 -0700
                Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-05 14:50 -0400
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 23:21 +0300
                Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-05 18:09 -0400
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-05 23:13 +0000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 02:30 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 09:39 +1000
                Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-05 22:08 -0400
                Re: Python 3.2 has some deadly infection Ethan Furman <ethan@stoneleaf.us> - 2014-06-05 20:47 -0700
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve@pearwood.info> - 2014-06-05 08:34 +0000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 12:41 +0300
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-05 06:37 -0700
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 17:45 +0300
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-05 15:33 +0000
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 02:12 +1000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-05 09:54 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 03:36 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 19:52 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 03:28 +1000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-05 15:35 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 08:52 +1000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-05 20:11 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 13:20 +1000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-05 20:32 -0700
                Re: Python 3.2 has some deadly infection Akira Li <4kir4.1i@gmail.com> - 2014-06-06 12:03 +0400
                Re: Python 3.2 has some deadly infection Robin Becker <robin@reportlab.com> - 2014-06-05 16:37 +0100
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-05 16:16 +0000
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 01:50 +1000
                Re: Python 3.2 has some deadly infection Robin Becker <robin@reportlab.com> - 2014-06-05 17:17 +0100
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-05 16:32 +0000
                Re: Python 3.2 has some deadly infection Ethan Furman <ethan@stoneleaf.us> - 2014-06-06 07:40 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-06 03:14 +1000
                Re: Python 3.2 has some deadly infection Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-05 11:16 -0600
                Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-05 14:11 -0400
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-05 21:30 +0300
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-05 23:02 +0000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 02:21 +0300
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-06 12:15 +0000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 16:00 +0300
                Re: Python 3.2 has some deadly infection rurpy@yahoo.com - 2014-06-07 21:34 -0700
                Re: Python 3.2 has some deadly infection Ethan Furman <ethan@stoneleaf.us> - 2014-06-06 06:24 -0700
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 17:10 +0300
                Re: Python 3.2 has some deadly infection Michael Torrie <torriem@gmail.com> - 2014-06-06 09:02 -0600
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 18:32 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 01:50 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 20:02 +0300
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-06 10:13 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 03:26 +1000
                Re: Python 3.2 has some deadly infection wxjmfauth@gmail.com - 2014-06-06 11:03 -0700
                Re: Python 3.2 has some deadly infection Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-06 21:18 +0000
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 08:18 +1000
                Re: Python 3.2 has some deadly infection Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-06-06 15:57 +0000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-06 09:21 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 02:48 +1000
                Re: Python 3.2 has some deadly infection Rustom Mody <rustompmody@gmail.com> - 2014-06-06 10:04 -0700
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 03:12 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 20:11 +0300
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 03:16 +1000
                Re: Python 3.2 has some deadly infection Marko Rauhamaa <marko@pacujo.net> - 2014-06-06 20:18 +0300
                Re: Python 3.2 has some deadly infection Ned Batchelder <ned@nedbatchelder.com> - 2014-06-06 13:33 -0400
                Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-07 01:25 +1000
                Re: Python 3.2 has some deadly infection wxjmfauth@gmail.com - 2014-06-06 08:44 -0700
                Re: Python 3.2 has some deadly infection wxjmfauth@gmail.com - 2014-06-06 08:48 -0700
                Re: Python 3.2 has some deadly infection Robin Becker <robin@reportlab.com> - 2014-06-06 12:56 +0100
                Re: Python 3.2 has some deadly infection Akira Li <4kir4.1i@gmail.com> - 2014-06-05 06:49 +0400
            Re: Python 3.2 has some deadly infection Chris Angelico <rosuav@gmail.com> - 2014-06-04 00:25 +1000
            Re: Python 3.2 has some deadly infection Terry Reedy <tjreedy@udel.edu> - 2014-06-03 14:22 -0400

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