Add a new section on the development plan; add an item
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@ -8,9 +8,7 @@
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.. Fix accents on Kristjan Valur Jonsson, Fuerstenau
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.. Big jobs: pep 391
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.. Initial section: development plans for 2.x in future
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.. Initial section: changes in deprecation warning behaviour
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.. Big jobs: pep 391, PyCapsule
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.. hyperlink all the methods & functions.
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@ -62,17 +60,42 @@ This article explains the new features in Python 2.7. The final
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release of 2.7 is currently scheduled for July 2010; the detailed
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schedule is described in :pep:`373`.
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Python 2.7 is planned to be the last major release in the 2.x series.
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Though more major releases have not been absolutely ruled out, the
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Python maintainers are planning to focus more on Python 3.x. Despite
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that, it's likely that the 2.7 release will have a longer period of
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maintenance compared to earlier 2.x versions.
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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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.. _whatsnew27-python31:
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The Future for Python 2.x
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=========================
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Python 2.7 is intended to be the last major release in the 2.x series.
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Though more major releases have not been absolutely ruled out, the
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Python maintainers are planning to focus their efforts on Python 3.x.
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This means that 2.7 will remain in place for a long time, running
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production systems that have not been ported to Python 3.x.
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Two consequences of the long-term significance of 2.7 are:
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* It's very likely the 2.7 release will have a longer period of
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maintenance compared to earlier 2.x versions. Python 2.7 will
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continue to be maintained while the transition to 3.x is in
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progress, and that transition will itself be lengthy. Most 2.x
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versions are maintained for about 4 years, from the first to the
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last bugfix release; patchlevel releases for Python 2.7 will
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probably be made for at least 6 years.
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* Because 2.7 will be running production applications, a policy
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decision was made to silence warnings only of interest to developers
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by default. Silencing :exc:`DeprecationWarning` and its descendants
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prevents users from seeing warnings triggered by an application.
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(Carried out in :issue:`7319`.)
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You can re-enable display of :exc:`DeprecationWarning` messages by
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running Python with the :option:`-Wdefault` (short form:
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:option:`-Wd`) switch, or you can add
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``warnings.simplefilter('default')`` to your code.
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Python 3.1 Features
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=======================
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@ -181,11 +204,6 @@ A secondary dictionary maps keys to their corresponding list node, so
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deletion doesn't have to traverse the entire linked list and therefore
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remains O(1).
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.. XXX check O(1)-ness with Raymond
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.. Also check if the 'somenamedtuple' in the collection module should
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.. be replaced/removed in order to use
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.. :meth:`~collections.namedtuple._asdict()` (see below)
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The standard library now supports use of ordered dictionaries in several
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modules.
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@ -364,10 +382,17 @@ if one is installed.
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XXX describe an example.
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Two smaller enhancements to the logging module are:
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Three smaller enhancements to the :mod:`logging` module, all
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implemented by Vinay Sajip, are:
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.. rev79293
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* The :class:`~logging.handlers.SysLogHandler` class now supports
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syslogging over TCP. The constructor has a *socktype* parameter
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giving the type of socket to use, either :const:`socket.SOCK_DGRAM`
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for UDP or :const:`socket.SOCK_STREAM` for TCP. The default
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protocol remains UDP.
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* :class:`Logger` instances gained a :meth:`getChild` method that retrieves a
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descendant logger using a relative path. For example,
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once you retrieve a logger by doing ``log = getLogger('app')``,
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@ -950,6 +975,30 @@ changes, or look through the Subversion logs for all the details.
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length as the read-only :attr:`~collections.deque.maxlen` attribute.
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(Both features added by Raymond Hettinger.)
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* Constructors for the parsing classes in the :mod:`ConfigParser` module now
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take a *allow_no_value* parameter, defaulting to false; if true,
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options without values will be allowed. For example::
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>>> import ConfigParser, StringIO
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>>> sample_config = """
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... [mysqld]
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... user = mysql
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... pid-file = /var/run/mysqld/mysqld.pid
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... skip-bdb
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... """
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>>> config = ConfigParser.RawConfigParser(allow_no_value=True)
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>>> config.readfp(StringIO.StringIO(sample_config))
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>>> config.get('mysqld', 'user')
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'mysql'
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>>> print config.get('mysqld', 'skip-bdb')
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None
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>>> print config.get('mysqld', 'unknown')
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Traceback (most recent call last):
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...
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ConfigParser.NoOptionError: No option 'unknown' in section: 'mysqld'
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(Contributed by Mats Kindahl; :issue:`7005`.)
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* Deprecated function: :func:`contextlib.nested`, which allows
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handling more than one context manager with a single :keyword:`with`
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statement, has been deprecated, because :keyword:`with` supports
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