mirror of https://github.com/python/cpython
148 lines
4.3 KiB
ReStructuredText
148 lines
4.3 KiB
ReStructuredText
****************************
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What's New In Python 3.3
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****************************
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:Author: Raymond Hettinger
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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 as a comment:
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% Patch 12345
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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.)
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This saves the maintainer the effort of going through the SVN log
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when researching a change.
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This article explains the new features in Python 3.3, compared to 3.2.
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PEP XXX: Stub
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=============
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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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* Stub
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New, Improved, and Deprecated Modules
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=====================================
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* Stub
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faulthandler
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------------
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New module: :mod:`faulthandler`.
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* :envvar:`PYTHONFAULTHANDLER`
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* :option:`-X` ``faulthandler``
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os
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--
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* The :mod:`os` module has a new :func:`~os.sendfile` function which provides
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an efficent "zero-copy" way for copying data from one file (or socket)
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descriptor to another. The phrase "zero-copy" refers to the fact that all of
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the copying of data between the two descriptors is done entirely by the
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kernel, with no copying of data into userspace buffers. :func:`~os.sendfile`
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can be used to efficiently copy data from a file on disk to a network socket,
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e.g. for downloading a file.
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(Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.)
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* The :mod:`os` module has two new functions: :func:`~os.getpriority` and
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:func:`~os.setpriority`. They can be used to get or set process
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niceness/priority in a fashion similar to :func:`os.nice` but extended to all
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processes instead of just the current one.
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(Patch submitted by Giampaolo Rodolà in :issue:`10784`.)
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nntplib
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-------
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The :class:`nntplib.NNTP` class now supports the context manager protocol to
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unconditionally consume :exc:`socket.error` exceptions and to close the NNTP
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connection when done::
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>>> from nntplib import NNTP
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>>> with nntplib.NNTP('news.gmane.org') as n:
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... n.group('gmane.comp.python.committers')
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...
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('211 1454 1 1454 gmane.comp.python.committers', '1454', '1', '1454', 'gmane.comp.python.committers')
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>>>
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(Contributed by Giampaolo Rodolà in :issue:`9795`)
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Optimizations
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=============
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Major performance enhancements have been added:
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* Stub
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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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* Stub
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Porting to Python 3.3
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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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* Stub
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.. Issue #11591: When :program:`python` was started with :option:`-S`,
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``import site`` will not add site-specific paths to the module search
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paths. In previous versions, it did. See changeset for doc changes in
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various files. Contributed by Carl Meyer with editions by Éric Araujo.
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.. Issue #10998: -Q command-line flags are related artifacts have been
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removed. Code checking sys.flags.division_warning will need updating.
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Contributed by Éric Araujo.
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