[Python-checkins] r87295 - python/branches/py3k/Doc/whatsnew/3.2.rst
raymond.hettinger
python-checkins at python.org
Thu Dec 16 01:21:08 CET 2010
Author: raymond.hettinger
Date: Thu Dec 16 01:21:08 2010
New Revision: 87295
Log:
Entries for ElementTree, collectionsm, functools and ZipFile.
Modified:
python/branches/py3k/Doc/whatsnew/3.2.rst
Modified: python/branches/py3k/Doc/whatsnew/3.2.rst
==============================================================================
--- python/branches/py3k/Doc/whatsnew/3.2.rst (original)
+++ python/branches/py3k/Doc/whatsnew/3.2.rst Thu Dec 16 01:21:08 2010
@@ -530,6 +530,11 @@
:mod:`nntplib` modules now work correctly with the bytes/text model in Python 3.
For the first time, there is correct handling of inputs with mixed encodings.
+Throughout the standard library, there has been more careful attention to
+encodings and text versus bytes issues. In particular, interactions with the
+operating system are now better able to pass non-ASCII data using the Windows
+mcbs encoding, locale aware encodings, or UTF-8.
+
Another significant win is the addition of substantially better support for
*SSL* connections and security certificates.
@@ -576,6 +581,39 @@
(Proposed and implemented by R. David Murray, :issue:`4661` and :issue:`10321`.)
+elementtree
+-----------
+
+The :mod:`xml.etree.ElementTree` package and it's :mod:`xml.etree.cElementTree`
+counterpart have been updated to version 1.3.
+
+Several new and useful functions and methods have been added:
+
+* :func:`xml.etree.ElementTree.fromstringlist` which builds an XML document
+ from a sequence of fragments
+* :func:`xml.etree.ElementTree.register_namespace` for registering a global
+ namespace prefix
+* :func:`xml.etree.ElementTree.tostringlist` for string representation
+ including all sublists
+* :meth:`xml.etree.ElementTree.Element.extend` for appending a sequence of zero
+ or more elements
+* :meth:`xml.etree.ElementTree.Element.iterfind` searches an element and
+ subelements
+* :meth:`xml.etree.ElementTree.Element.itertext` creates a text iterator over
+ an element and its sub-elements
+* :meth:`xml.etree.ElementTree.TreeBuilder.end` closes the current element
+* :meth:`xml.etree.ElementTree.TreeBuilder.doctype` handles a doctype
+ declaration
+
+Two methods have been deprecated:
+
+* :meth:`xml.etree.ElementTree.getchildren` use ``list(elem)`` instead.
+* :meth:`xml.etree.ElementTree.getiterator` use ``Element.iter`` instead.
+
+For details of the update, see `Introducing ElementTree
+<http://effbot.org/zone/elementtree-13-intro.htm>`_ on Fredrik Lundh's website.
+
+(Contributed by Fredrik Lundh.)
functools
---------
@@ -619,6 +657,36 @@
(By Nick Coghlan and Terrence Cole; :issue:`9567`, :issue:`3445`, and
:issue:`8814`.)
+* To help write classes with rich comparison methods, a new decorator
+ :func:`functools.total_ordering` will use a existing equality and inequality
+ methods to fill-in the remaining methods.
+
+ For example, supplying *__eq__* and *__lt__* will enable
+ :func:`~functools.total_ordering` to fill-in *__le__*, *__gt__* and *__ge__*::
+
+ @total_ordering
+ class Student:
+ def __eq__(self, other):
+ return ((self.lastname.lower(), self.firstname.lower()) ==
+ (other.lastname.lower(), other.firstname.lower()))
+ def __lt__(self, other):
+ return ((self.lastname.lower(), self.firstname.lower()) <
+ (other.lastname.lower(), other.firstname.lower()))
+
+ (Contributed by Raymond Hettinger.)
+
+* To aid in porting programs from Python 2, the :func:`~functools.cmp_to_key`
+ function converts an old-style comparion function to
+ modern :term:`key function`:
+
+ >>> # locale-aware sort order
+ >>> sorted(iterable, key=cmp_to_key(locale.strcoll))
+
+ For sorting examples and a brief sorting tutorial, see the `Sorting HowTo
+ <http://wiki.python.org/moin/HowTo/Sorting/>`_ tutorial.
+
+ (Contributed by Raymond Hettinger.)
+
itertools
---------
@@ -677,6 +745,21 @@
>>> list(d)
['X', 'a', 'b', 'd', 'e']
+ (Contributed by Raymond Hettinger.)
+
+* The :class:`collections.deque` grew two new methods :meth:`~collections.deque.count`
+ and :meth:`collections.deque.reverse` that make them more substitutable for
+ :class:`list` when needed:
+
+ >>> d = deque('simsalabim')
+ >>> d.count('s')
+ 2
+ >>> d.reverse()
+ >>> d
+ deque(['m', 'i', 'b', 'a', 'l', 'a', 's', 'm', 'i', 's'])
+
+ (Contributed by Raymond Hettinger.)
+
datetime
--------
@@ -785,22 +868,27 @@
* The :class:`decimal.Decimal` contructor now accepts :class:`float` objects
directly so there in no longer a need to use the :meth:`~decimal.Decimal.from_float`
- method.
+ method (:issue:`8257`).
* Mixed type comparisons are now fully supported so that
:class:`~decimal.Decimal` objects can be directly compared with :class:`float`
- and :class:`fractions.Fraction`.
+ and :class:`fractions.Fraction` (:issue:`2531` and :issue:`8188`).
Similar changes were made to :class:`fractions.Fraction` so that the
:meth:`~fractions.Fraction.from_float()` and :meth:`~fractions.Fraction.from_decimal`
-methods are no longer needed.
+methods are no longer needed (:issue:`8294`):
+
+>>> Decimal(1.1)
+Decimal('1.100000000000000088817841970012523233890533447265625')
+>>> Fraction(1.1)
+Fraction(2476979795053773, 2251799813685248)
Another useful change for the :mod:`decimal` module is that the
:attr:`Context.clamp` attribute is now public. This is useful in creating
contexts that correspond to the decimal interchange formats specified in IEEE
754 (see :issue:`8540`).
-(Contributed by Mark Dickinson.)
+(Contributed by Mark Dickinson and Raymond Hettinger.)
ftp
---
@@ -832,8 +920,8 @@
.. XXX mention os.popen and subprocess.Popen auto-closing of fds
-gzip
-----
+gzip and zipfile
+----------------
:class:`gzip.GzipFile` now implements the :class:`io.BufferedIOBase`
:term:`abstract base class` (except for ``truncate()``). It also has a
@@ -860,6 +948,14 @@
Aides and Brian Curtin in :issue:`9962`, :issue:`1675951`, :issue:`7471` and
:issue:`2846`.)
+Also, the :class:`zipfile.ZipExtFile` class was reworked internally to represent
+files stored inside an archive. The new implementation is significantly faster
+and can be wrapped in a :class:`io.BufferedReader` object for more speedups. It
+also solves an issue where interleaved calls to *read* and *readline* gave the
+wrong results.
+
+(Patch submitted by by Nir Aides in :issue:`7610`.)
+
shutil
------
@@ -877,7 +973,7 @@
sqlite3
-------
-The :mod:`sqlite3` module has two new capabilities.
+The :mod:`sqlite3` module was updated to version 2.6.0. It has two new capabilities.
* The :attr:`sqlite3.Connection.in_transit` attribute is true if there is an
active transaction for uncommitted changes.
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