This document describes the development and release schedule for
Python 2.6 and 3.0. The schedule primarily concerns itself with
PEP-sized items. Small features may be added up to and including
the first beta release. Bugs may be fixed until the final
There will be at least two alpha releases, two beta releases, and
one release candidate. The releases are planned for October 2008.
Python 2.6 is not only the next advancement in the Python 2
series, it is also a transitional release, helping developers
begin to prepare their code for Python 3.0. As such, many
features are being backported from Python 3.0 to 2.6. Thus, it
makes sense to release both versions in at the same time. The
precedence for this was set with the Python 1.6 and 2.0 release.
Until rc, we will be releasing Python 2.6 and 3.0 in lockstep, on
a monthly release cycle. The releases will happen on the first
Wednesday of every month through the beta testing cycle. Because
Python 2.6 is ready sooner, and because we have outside deadlines
we'd like to meet, we've decided to split the rc releases. Thus
Python 2.6 final is currently planned to come out two weeks before
Python 3.0 final.
Release Manager and Crew
2.6/3.0 Release Manager: Barry Warsaw
Windows installers: Martin v. Loewis
Mac installers: Ronald Oussoren
Documentation: Georg Brandl
RPMs: Sean Reifschneider
Python 3.0 is no longer being maintained for any purpose.
Python 2.6 is in security fix only maintenance mode until October
1, 2013. Security fixes are released in source-only formats.
After this date, Python 2.6 will no longer be maintained for any
Note that this schedule is completely tentative. The number of alphas,
betas and release candidates will be determined as the release process
unfolds. The minimal schedule is:
Feb 29 2008: Python 2.6a1 and 3.0a3 are released
Apr 02 2008: Python 2.6a2 and 3.0a4 are released
May 08 2008: Python 2.6a3 and 3.0a5 are released
Jun 18 2008: Python 2.6b1 and 3.0b1 are released
Jul 17 2008: Python 2.6b2 and 3.0b2 are released
Aug 20 2008: Python 2.6b3 and 3.0b3 are released
Sep 12 2008: Python 2.6rc1 is released
Sep 17 2008: Python 2.6rc2 and 3.0rc1 released
Oct 01 2008: Python 2.6 final released
Nov 06 2008: Python 3.0rc2 released
Nov 21 2008: Python 3.0rc3 released
Dec 03 2008: Python 3.0 final released
Dec 04 2008: Python 2.6.1 final released
Apr 14 2009: Python 2.6.2 final released
Oct 02 2009: Python 2.6.3 final released
Oct 25 2009: Python 2.6.4 final released
Mar 19 2010: Python 2.6.5 final released
Aug 24 2010: Python 2.6.6 final released
Jun 03 2011: Python 2.6.7 final released (security-only)
Apr 10 2012: Python 2.6.8 final released (security-only)
Python 2.6.9 (security-only) planned for October 2013. This
will be the last Python 2.6 release.
See the public `Google calendar`_
Completed features for 3.0
See PEP 3000 [#pep3000] and PEP 3100 [#pep3100] for details on the
Python 3.0 project.
Completed features for 2.6
- 352: Raising a string exception now triggers a TypeError.
Attempting to catch a string exception raises DeprecationWarning.
BaseException.message has been deprecated. [#pep352]
- 358: The "bytes" Object [#pep358]
- 366: Main module explicit relative imports [#pep366]
- 370: Per user site-packages directory [#pep370]
- 3112: Bytes literals in Python 3000 [#pep3112]
- 3127: Integer Literal Support and Syntax [#pep3127]
- 371: Addition of the multiprocessing package [#pep371]
New modules in the standard library:
- new enhanced turtle module
Deprecated modules and functions in the standard library:
- popen2, os.popen()
Modules removed from the standard library:
Warnings for features removed in Py3k:
- builtins: apply, callable, coerce, dict.has_key, execfile,
- backticks and <>
- float args to xrange
- coerce and all its friends
- comparing by default comparison
- softspace removal for print() function
- removal of modules because of PEP 4/3100/3108
Other major features:
- with/as will be keywords
- a __dir__() special method to control dir() was added 
- AtheOS support stopped.
- warnings module implemented in C
- compile() takes an AST and can convert to byte code
Possible features for 2.6
New features *should* be implemented prior to alpha2, particularly
any C modifications or behavioral changes. New features *must* be
implemented prior to beta1 or will require Release Manager approval.
The following PEPs are being worked on for inclusion in 2.6: None.
Each non-trivial feature listed here that is not a PEP must be
discussed on python-dev. Other enhancements include:
- distutils replacement (requires a PEP)
New modules in the standard library:
(Patch rejected, module should be written in C)
BDFL pronouncement for inclusion in 2.5:
PJE's withdrawal from 2.5 for inclusion in 2.6:
Modules to gain a DeprecationWarning (as specified for Python 2.6
or through negligence):
- compiler package (or a Py3K warning instead?)
- Convert Parser/*.c to use the C warnings module rather than printf
- Add warnings for Py3k features removed:
* float args to PyArgs_ParseTuple
* other comparison changes?
* int division?
* All PendingDeprecationWarnings (e.g. exceptions)
* using zip() result as a list
* the exec statement (use function syntax)
* function attributes that start with func_* (should use __*__)
* the L suffix for long literals
* renaming of __nonzero__ to __bool__
* multiple inheritance with classic classes? (MRO might change)
* properties and classic classes? (instance attrs shadow property)
- use __bool__ method if available and there's no __nonzero__
- Check the various bits of code in Demo/ and Tools/ all still work,
update or remove the ones that don't.
- All modules in Modules/ should be updated to be ssize_t clean.
- All of Python (including Modules/) should compile cleanly with g++
- Start removing deprecated features and generally moving towards Py3k
- Replace all old style tests (operate on import) with unittest or docttest
- Add tests for all untested modules
- Document undocumented modules/features
- bdist_deb in distutils package
- bdist_egg in distutils package
- pure python pgen module
Deferral to 2.6:
- Remove the fpectl module?
Deferred until 2.7
How should import warnings be handled?
..  Adding a __dir__() magic method
.. [#pep358] PEP 358 (The "bytes" Object)
.. [#pep366] PEP 366 (Main module explicit relative imports)
.. [#pep367] PEP 367 (New Super)
.. [#pep371] PEP 371 (Addition of the multiprocessing package)
.. [#pep3000] PEP 3000 (Python 3000)
.. [#pep3100] PEP 3100 (Miscellaneous Python 3.0 Plans)
.. [#pep3112] PEP 3112 (Bytes literals in Python 3000)
.. [#pep3127] PEP 3127 (Integer Literal Support and Syntax)
.. _Google calendar:
This document has been placed in the public domain.