Features/Python 2.7

Python 2.7

Summary

Update the system Python 2 stack in Fedora from 2.6 to 2.7

Owner

• Name: Dave Malcolm

• Email: <dmalcolm@redhat.com>

Current status

• Targeted release: Fedora 14
• Last updated: 2010-07-25
• Percentage of completion: 60%

Packages built into dist-f14-py27-rebuild; currently 170 failing rebuilds

Packages waiting on other packages

• pyactivemq needs:
  • boost DONE needed :
    • openmpi DONE (applied workaround for bug 617766)
• revelation needs gnome-python2-applet from:
  • gnome-python2-desktop, which fails to build against gtk-3.0, apparently due to a missing header
• python-networkx needs:
  • python-matplotlib
    • scipiy fails, looks like this upstream bug. May need this patch to numpy (not sure yet)
• gdl needs:
  • python-matplotlib (see above)
  • plplot needs:
    • gnome-python2-canvas, gnome-python2-gnomevfs, gnome-python2-gnome (see below)
• gget needs
  • notify-python fails to build with /usr/include/pygtk-2.0/pygtk/pygtk.h:8:21: fatal error: gtk/gtk.h: No such file or directory
• hamster-applet needs:
  • many gnome-python2-* packages from gnome-python2-desktop (see above)
• sugar-tamtam needs:
  • csound
    • boost-python DONE
    • build parameter changes
  • gnome-python2-rsvg
• ipa needs
  • TurboGears needs:
    • python-turbojson
      • python-peak-rules: fails in %check apparently within peak-util-assembler (is this 2.7-compatible?)
    • python-cherrypy2
    • python-peak-rules (see above)
    • python-formencode fails in %check
    • python-ruledispatch (fails in %check, with "KeyError: 320" in 4 tests, and "AssertionError: 42529136 == Pointer(<invalid at 0x0x288f170>)" in another)
  • setools-libs-python from setools
    • setools fails with Error: SWIG version >= 1.3.28 is required. You have 2.0.0. You should look at http://www.swig.org
  • python-cherrypy2 (see above)
  • python-formencode (see above)
  • python-ruledispatch (see above)
  • python-turbojson (see above)
• conduit needs
  • pygoocanvas
• caribou needs
  • python-virtkey fails with /usr/include/gtk-2.0/gdk/gdkpixbuf.h:37:35: fatal error: gdk-pixbuf/gdk-pixbuf.h: No such file or directory included from /usr/include/gtk-2.0/gdk/gdkcairo.h
  • pyclutter
• telepathy-farsight needs
  • farsight2 needs:
    • gupnp-igd-python
• lazygal fails with AttributeError: 'module' object has no attribute 'sysconfig' (distutils module)
• planner needs:
  • gnome-python2-gnomevfs
  • gnome-python2-gnome
• orca needs:
  • gnome-python2-bonobo
  • gnome-python2-gconf
  • gnome-python2-libwnck
• pootle needs:
  • aeidon
  • python-lxml fails to build inside the 2to3 invocation in fix_itertools_imports.py
  • translate-toolkit
    • python-lxml (see above)
• hulahop needs
  • xulrunner-python (dmalcolm is not in ACL for rpms/xulrunner/devel)

Packages with build errors

• ecryptfs-tools fails to build with test.c:284:6: error: 'lower_byte_offset' may be used uninitialized in this function
• ocfs2-tools fails to build with mount.ocfs2.c:264:2: error: variable-sized object may not be initialized
• onboard fails to build with /usr/bin/python: can't open file 'setup.py': Errno 2 No such file or directory
• sympy fails with TypeError: not enough arguments for format string in sympy-0.6.7/sympy/utilities/runtests.py

Common bugs

FIXED: gobject-introspection

gobject-introspection's /usr/bin/g-ir-scanner was incompatible with python 2.7, this led to anything building a .gir file failing.

This was blocking:

• gtk-vnc DONE
• PackageKit DONE

SWIG

Various swig users fail to find the python libraries during "configure":

checking for Python library path... find: `/usr/lib/python/config/': No such file or directory
find: `/usr/lib/python/': No such file or directory
/usr/lib
checking python extra libraries... 

Relevant part of "configure" seems to be

        python_path=`echo $PYTHON | sed "s,/bin.*$,,"`
        for i in "$python_path/lib/python$PYTHON_VERSION/config/" "$python_path/lib/python$PYTHON_VERSION/" "$python_path/lib/python/config/" "$python_path/\
lib/python/" "$python_path/" ; do

This sets $python_path to "/usr", and then looks for config within /usr/lib, which fails on 64-bit: the relevant files are in /usr/lib64 (why did this work before? is this a python change?)

Before this we see errors like this:

checking for SWIG version... 2.0.0
configure: WARNING: SWIG version >= 1.3.17 is required.  You have 2.0.0.  You should look at http://www.swig.org

The test in the configure seems to look for an exact match on major and minor, and >= on the patch level, and thus "2" -ne "1" seems to leave SWIG_LIB unset, and could be the actual problem here.

This is currently blocking:

• libopensync
• setools

Detailed Description

• Python 2.7 was released on 2010-07-03

This will require a rebuild of everything with Requires: python(abi) = 2.6. See Mass_Rebuild_SOP for how we do a full rebuild of everything - hopefully we can adapt the scripts there to accomplish the rebuild needed for Python 2.7. See Features/Python_2.7/MassRebuild for notes on this specific rebuild.

Porting

Hopefully, little to no porting will be required.

Some notes on changes that may require porting are given on the upstream wiki here: http://docs.python.org/dev/whatsnew/2.7.html#porting-to-python-2-7

Benefit to Fedora

Fedora aims to showcase the latest in free and open source software - we should have the most recent release of Python.

Scope

Python is pervasive in Fedora. Everything from yum to system-config-* to anaconda to pungi is written in Python.

How To Test

Interested testers do not need special hardware. If you have a favorite Python script, module, or application, please test it with Python 2.7 and verify that it still works as you expect.

My own test plan:

• Smoketest of the interpreter
• Run the upstream regression test suite
• Ensure that yum still works
• Ensure that anaconda still works

User Experience

Users should not notice any difference, other than the availability of the 2.7 interpreter

Dependencies

The list is too large to include here.

repoquery --whatrequires --alldeps -s "python(abi) = 2.6" | sort -u

indicates approximately 1200 rpms

Contingency Plan

• There is none. This is do-or-die.

Documentation

What’s New in Python 2.7

Release Notes

The system Python 2 stack has been upgraded to 2.7. For a list of changes see http://docs.python.org/dev/whatsnew/2.7.html

Comments and Discussion

• See Talk:Features/Python_2.7