190 lines
6.2 KiB
ReStructuredText
190 lines
6.2 KiB
ReStructuredText
****************************
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What's New in Python 2.7
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****************************
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:Author: A.M. Kuchling (amk at amk.ca)
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:Release: |release|
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:Date: |today|
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.. $Id$
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Rules for maintenance:
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* Anyone can add text to this document. Do not spend very much time
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on the wording of your changes, because your text will probably
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get rewritten to some degree.
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* The maintainer will go through Misc/NEWS periodically and add
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changes; it's therefore more important to add your changes to
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Misc/NEWS than to this file.
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* This is not a complete list of every single change; completeness
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is the purpose of Misc/NEWS. Some changes I consider too small
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or esoteric to include. If such a change is added to the text,
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I'll just remove it. (This is another reason you shouldn't spend
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too much time on writing your addition.)
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* If you want to draw your new text to the attention of the
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maintainer, add 'XXX' to the beginning of the paragraph or
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section.
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* It's OK to just add a fragmentary note about a change. For
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example: "XXX Describe the transmogrify() function added to the
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socket module." The maintainer will research the change and
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write the necessary text.
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* You can comment out your additions if you like, but it's not
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necessary (especially when a final release is some months away).
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* Credit the author of a patch or bugfix. Just the name is
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sufficient; the e-mail address isn't necessary.
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* It's helpful to add the bug/patch number in a parenthetical comment.
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XXX Describe the transmogrify() function added to the socket
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module.
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(Contributed by P.Y. Developer; :issue:`12345`.)
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This saves the maintainer some effort going through the SVN logs
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when researching a change.
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This article explains the new features in Python 2.7.
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No release schedule has been decided yet for 2.7.
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.. Compare with previous release in 2 - 3 sentences here.
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add hyperlink when the documentation becomes available online.
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.. ========================================================================
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.. Large, PEP-level features and changes should be described here.
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.. Should there be a new section here for 3k migration?
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.. Or perhaps a more general section describing module changes/deprecation?
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.. ========================================================================
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Kristj<EFBFBD>n Valur J<>nsson, issue 4293
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Py_AddPendingCall is now thread safe. This allows any worker thread
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to submit notifications to the python main thread. This is particularly
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useful for asynchronous IO operations.
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Other Language Changes
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======================
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Some smaller changes made to the core Python language are:
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* The :func:`int` and :func:`long` types gained a ``bit_length``
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method that returns the number of bits necessary to represent
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its argument in binary::
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>>> n = 37
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>>> bin(37)
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'0b100101'
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>>> n.bit_length()
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6
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>>> n = 2**123-1
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>>> n.bit_length()
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123
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>>> (n+1).bit_length()
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124
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(Contributed by Fredrik Johansson and Victor Stinner; :issue:`3439`.)
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.. ======================================================================
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Optimizations
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-------------
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To be written.
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.. ======================================================================
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New, Improved, and Deprecated Modules
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=====================================
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As in every release, Python's standard library received a number of
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enhancements and bug fixes. Here's a partial list of the most notable
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changes, sorted alphabetically by module name. Consult the
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:file:`Misc/NEWS` file in the source tree for a more complete list of
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changes, or look through the Subversion logs for all the details.
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* A new function in the :mod:`subprocess` module,
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:func:`check_output`, runs a command with a specified set of arguments
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and returns the command's output as a string if the command runs without
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error, or raises a :exc:`CalledProcessError` exception otherwise.
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::
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>>> subprocess.check_output(['df', '-h', '.'])
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'Filesystem Size Used Avail Capacity Mounted on\n
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/dev/disk0s2 52G 49G 3.0G 94% /\n'
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>>> subprocess.check_output(['df', '-h', '/bogus'])
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...
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subprocess.CalledProcessError: Command '['df', '-h', '/bogus']' returned non-zero exit status 1
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(Contributed by Gregory P. Smith.)
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* It is not mandatory anymore to store clear text passwords in the
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:file:`.pypirc` file when registering and uploading packages to PyPI. As long
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as the username is present in that file, the :mod:`distutils` package will
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prompt for the password if not present. (Added by tarek, with the initial
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contribution of Nathan Van Gheem; :issue:`4394`.)
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.. ======================================================================
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.. whole new modules get described in subsections here
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.. ======================================================================
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Build and C API Changes
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=======================
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Changes to Python's build process and to the C API include:
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* If you use the :file:`.gdbinit` file provided with Python,
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the "pyo" macro in the 2.7 version will now work when the thread being
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debugged doesn't hold the GIL; the macro will now acquire it before printing.
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(Contributed by haypo XXX; :issue:`3632`.)
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.. ======================================================================
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Port-Specific Changes: Windows
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-----------------------------------
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* The :mod:`msvcrt` module now contains some constants from
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the :file:`crtassem.h` header file:
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:data:`CRT_ASSEMBLY_VERSION`,
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:data:`VC_ASSEMBLY_PUBLICKEYTOKEN`,
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and :data:`LIBRARIES_ASSEMBLY_NAME_PREFIX`.
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(Added by Martin von Loewis (XXX check); :issue:`4365`.)
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.. ======================================================================
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Port-Specific Changes: Mac OS X
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-----------------------------------
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.. ======================================================================
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Porting to Python 2.7
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=====================
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This section lists previously described changes and other bugfixes
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that may require changes to your code:
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To be written.
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.. ======================================================================
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.. _acks27:
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Acknowledgements
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================
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The author would like to thank the following people for offering
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suggestions, corrections and assistance with various drafts of this
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article: no one yet.
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