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)

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

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

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

LGTM.

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.

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> > _______________________________________ >

Simply replced printout from stderr to stdout.

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

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

New changeset 587bdb940524 by Eli Bendersky in branch 'default': Update whatsnew/3.4 wrt. --version going to stdout. #18338, #18920, #18922 http://hg.python.org/cpython/rev/587bdb940524

Is there a workaround for python2? The issue is that autotools is checking that installed tools support --help and --version and it expects those to stdout: bad=0; pid=$$; list="gtkdoc-check gtkdoc-depscan gtkdoc-fixxref gtkdoc-mkdb gtkdoc-mkhtml gtkdoc-mkhtml2 gtkdoc-mkman gtkdoc-mkpdf gtkdoc-rebase gtkdoc-scan gtkdoc-scangobj gtkdocize"; for p in $list; do \ case ' ' in \ *" $p "* | *" ../../$p "*) continue;; \ esac; \ f=`echo "$p" | sed 's,^.*/,,;s,x,x,'`; \ for opt in --help --version; do \ if "/home/ensonic/projects/gnome/gtk-doc/gtk-doc-1.27.1/_inst/bin/$f" $opt >c${pid}_.out \ 2>c${pid}_.err </dev/null \ && test -n "`cat c${pid}_.out`" \ && test -z "`cat c${pid}_.err`"; then :; \ else echo "$f does not support $opt" 1>&2; bad=1; fi; \ done; \ done; rm -f c${pid}_.???; exit $bad gtkdoc-check does not support --version gtkdoc-fixxref does not support --version gtkdoc-mkdb does not support --version gtkdoc-mkhtml does not support --version gtkdoc-mkhtml2 does not support --version gtkdoc-mkman does not support --version gtkdoc-mkpdf does not support --version gtkdoc-rebase does not support --version gtkdoc-scan does not support --version gtkdoc-scangobj does not support --version Makefile:637: recipe for target 'installcheck-binSCRIPTS' failed

Sorry need to find the ticket for argparse ..