python --version should send output to STDOUT

[jaalto]

BPO	18338
Nosy	@tiran, @berkerpeksag, @serhiy-storchaka
Files	issue18338.diff issue18338.diff: Patch for issue 18338 issue18338.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2013-07-11.17:03:27.844>
created_at = <Date 2013-07-01.11:01:27.276>
labels = ['interpreter-core', 'easy', 'type-bug']
title = 'python --version should send output to STDOUT'
updated_at = <Date 2018-03-24.15:00:08.695>
user = 'https://bugs.python.org/jaalto'

bugs.python.org fields:

activity = <Date 2018-03-24.15:00:08.695>
actor = 'Stefan Sauer'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2013-07-11.17:03:27.844>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2013-07-01.11:01:27.276>
creator = 'jaalto'
dependencies = []
files = ['30756', '30848', '30881']
hgrepos = []
issue_num = 18338
keywords = ['patch', 'easy']
message_count = 13.0
messages = ['192119', '192122', '192198', '192225', '192228', '192269', '192270', '192605', '192784', '192881', '197071', '314370', '314372']
nosy_count = 9.0
nosy_names = ['jaalto', 'christian.heimes', 'python-dev', 'Ramchandra Apte', 'berker.peksag', 'serhiy.storchaka', 'Matthew.Byrne', 'Michael Dickens', 'Stefan Sauer']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue18338'
versions = ['Python 3.4']

[jaalto]

C.f. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=603851

When user is calling program with options, it is not an error
condition to run:

python --version

The output is now sent to stderr. Please change to send to stdout as
in other *nix utilities, in order to collect in shell scrips:

version=$(python --version)

[tiran]

Your proposal is reasonable. I'm flagging it for Python 3.4+ as it's a backward incompatible modification.

[RamchandraApte]

Your proposal is reasonable. I'm flagging it for Python 3.4+ as it's a backward incompatible modification.

Agree.

[berkerpeksag]

Here is a patch with an updated test.

The -v flag also sends the output to stderr. Should that be fixed too? See Modules/main.c:678 and Lib/test/test_cmd_line.py:l47

[serhiy-storchaka]

LGTM.

[RamchandraApte]

On 3 July 2013 15:16, Berker Peksag <report@bugs.python.org> wrote:

Berker Peksag added the comment:

Here is a patch with an updated test.

The -v flag also sends the output to stderr. Should that be fixed too? See
Modules/main.c:678 and Lib/test/test_cmd_line.py:l47

----------
keywords: +patch
nosy: +berker.peksag
stage: needs patch -> patch review
Added file: http://bugs.python.org/file30756/issue18338.diff

No, -v is for debugging purposes and should go to stderr IMO.

[RamchandraApte]

No, I think that

On 3 July 2013 16:06, Serhiy Storchaka <report@bugs.python.org> wrote:

Serhiy Storchaka added the comment:

LGTM.

----------
nosy: +serhiy.storchaka

---

Python tracker <report@bugs.python.org>
<http://bugs.python.org/issue18338\>

---

[MatthewByrne]

Simply replced printout from stderr to stdout.

[MichaelDickens]

Patch for bpo-18338. Changes output for --version and updates unit test accordingly.

[python-dev]

New changeset e6384b8b2325 by Serhiy Storchaka in branch 'default':
Issue bpo-18338: python --version now prints version string to stdout, and
http://hg.python.org/cpython/rev/e6384b8b2325