[Python-checkins] r79963 - python/trunk/Doc/whatsnew/2.7.rst

andrew.kuchling python-checkins at python.org
Sun Apr 11 22:40:09 CEST 2010 

Author: andrew.kuchling
Date: Sun Apr 11 22:40:09 2010
New Revision: 79963

Log:
Add several items

Modified:
   python/trunk/Doc/whatsnew/2.7.rst

Modified: python/trunk/Doc/whatsnew/2.7.rst
==============================================================================
--- python/trunk/Doc/whatsnew/2.7.rst	(original)
+++ python/trunk/Doc/whatsnew/2.7.rst	Sun Apr 11 22:40:09 2010
@@ -58,8 +58,9 @@
 schedule is described in :pep:`373`.
 
 Python 2.7 is planned to be the last major release in the 2.x series.
-Though more major releases have not been absolutely ruled out, it's
-likely that the 2.7 release will have an extended period of
+Though more major releases have not been absolutely ruled out, the
+Python maintainers are planning to focus more on Python 3.x.  Despite
+that, it's likely that the 2.7 release will have a longer period of
 maintenance compared to earlier 2.x versions.
 
 .. Compare with previous release in 2 - 3 sentences here.
@@ -496,6 +497,10 @@
   Python3-warning mode, Python 2.7 will now warn about this odd usage.
   (Noted by James Lingard; :issue:`7362`.)
 
+* It's now possible to create weak references to old-style class
+  objects.  New-style classes were always weak-referenceable.  (Fixed
+  by Antoine Pitrou; :issue:`8268`.)
+
 * When a module object is garbage-collected, the module's dictionary is
   now only cleared if no one else is holding a reference to the
   dictionary (:issue:`7140`).
@@ -684,11 +689,15 @@
      >>> c['z']
      0
 
-  There are two additional :class:`~collections.Counter` methods:
-  :meth:`~collections.Counter.most_common` returns the N most common elements
-  and their counts, and :meth:`~collections.Counter.elements`
-  returns an iterator over the contained element, repeating each element
-  as many times as its count::
+  There are three additional :class:`~collections.Counter` methods:
+  :meth:`~collections.Counter.most_common` returns the N most common
+  elements and their counts.  :meth:`~collections.Counter.elements`
+  returns an iterator over the contained elements, repeating each
+  element as many times as its count.
+  :meth:`~collections.Counter.subtract` takes an iterable and
+  subtracts one for each element instead of adding; if the argument is
+  a dictionary or another :class:`Counter`, the counts are
+  subtracted. ::
 
     >>> c.most_common(5)
     [(' ', 6), ('e', 5), ('s', 3), ('a', 2), ('i', 2)]
@@ -697,11 +706,16 @@
        'e', 'e', 'e', 'e', 'e', 'g', 'f', 'i', 'i',
        'h', 'h', 'm', 'l', 'l', 'o', 'n', 'p', 's',
        's', 's', 'r', 't', 't', 'x'
-
-  .. maybe it's better to use list(c.elements()) here
+    >>> c['e']
+    5
+    >>> c.subtract('very heavy on the letter e')
+    >>> c['e']    # Count is now lower
+    -1
 
   Contributed by Raymond Hettinger; :issue:`1696199`.
 
+  .. revision 79660
+
   The new :class:`~collections.OrderedDict` class is described in the earlier
   section :ref:`pep-0372`.
 
@@ -757,18 +771,21 @@
   :meth:`~decimal.Context.canonical` and :meth:`~decimal.Context.is_canonical`
   methods.  (Patch by Juan José Conti; :issue:`7633`.)
 
-  The constructor for :class:`~decimal.Decimal` now accepts non-European
-  Unicode characters, such as Arabic-Indic digits.  (Contributed by
-  Mark Dickinson; :issue:`6595`.)
+  The constructor for :class:`~decimal.Decimal` now accepts
+  floating-point numbers (added by Raymond Hettinger; :issue:`8257`)
+  and non-European Unicode characters such as Arabic-Indic digits
+  (contributed by Mark Dickinson; :issue:`6595`).
 
   When using :class:`~decimal.Decimal` instances with a string's
   :meth:`~str.format` method, the default alignment was previously
   left-alignment.  This has been changed to right-alignment, which seems
   more sensible for numeric types.  (Changed by Mark Dickinson; :issue:`6857`.)
 
-* The :class:`~fractions.Fraction` class now accepts two rational numbers
-  as arguments to its constructor.
-  (Implemented by Mark Dickinson; :issue:`5812`.)
+* The :class:`~fractions.Fraction` class now accepts a single float or
+  :class:`~decimal.Decimal` instance, or two rational numbers, as
+  arguments to its constructor.  (Implemented by Mark Dickinson;
+  rationals added in :issue:`5812`, and float/decimal in
+  :issue:`8294`.)
 
   An oversight was fixed, making the :class:`Fraction` match the other
   numeric types; ordering comparisons (``<``, ``<=``, ``>``, ``>=``) between
@@ -975,13 +992,17 @@
   Victor Stinner; :issue:`3137`.)
 
 * The :mod:`socket` module's :class:`~ssl.SSL` objects now support the
-  buffer API, which fixed a test suite failure.  (Fixed by Antoine
-  Pitrou; :issue:`7133`.)  The version of OpenSSL being used is
-  now available as the module attributes
-  :attr:`OPENSSL_VERSION` (a string),
+  buffer API, which fixed a test suite failure (fix by Antoine Pitrou;
+  :issue:`7133`).  :class:`SSL` objects also now automatically set
+  OpenSSL's :cmacro:`SSL_MODE_AUTO_RETRY`, which will prevent an error
+  code being returned from :meth:`recv` operations that trigger an SSL
+  renegotiation (fix by Antoine Pitrou; :issue:`8222`).
+
+  The version of OpenSSL being used is now available as the module
+  attributes :attr:`OPENSSL_VERSION` (a string),
   :attr:`OPENSSL_VERSION_INFO` (a 5-tuple), and
-  :attr:`OPENSSL_VERSION_NUMBER` (an integer).  (Added by Antoine Pitrou;
-  :issue:`8321`.)
+  :attr:`OPENSSL_VERSION_NUMBER` (an integer).  (Added by Antoine
+  Pitrou; :issue:`8321`.)
 
   The :func:`~socket.create_connection` function
   gained a *source_address* parameter, a ``(host, port)`` 2-tuple
@@ -1011,7 +1032,10 @@
   errors when a value is too large for a particular integer format
   code (one of ``bBhHiIlLqQ``); it now always raises a
   :exc:`struct.error` exception.  (Changed by Mark Dickinson;
-  :issue:`1523`.)
+  :issue:`1523`.)  The :func:`~struct.pack` function will also
+  attempt to use :meth:`__index__` to convert and pack non-integers
+  before trying the :meth:`__int__` method or reporting an error.
+  (Changed by Mark Dickinson; :issue:`8300`.)
 
 * New function: the :mod:`subprocess` module's
   :func:`~subprocess.check_output` runs a command with a specified set of arguments
@@ -1346,6 +1370,18 @@
 
 Changes to Python's build process and to the C API include:
 
+* The latest release of the GNU Debugger, GDB 7, can be `scripted
+  using Python
+  <http://sourceware.org/gdb/current/onlinedocs/gdb/Python.html>`__.
+  When you begin debugging an executable program P, GDB will look for
+  a file named ``P-gdb.py`` and automatically read it.  Dave Malcolm
+  contributed a :file:`python-gdb.py` that adds a number of useful
+  commands when debugging Python itself.  For example, there are
+  ``py-up`` and ``py-down`` that go up or down one Python stack frame,
+  which usually corresponds to several C stack frames.  ``py-print``
+  prints the value of a Python variable, and ``py-bt`` prints the
+  Python stack trace.  (Added as a result of :issue:`8032`.)
+
 * If you use the :file:`.gdbinit` file provided with Python,
   the "pyo" macro in the 2.7 version now works correctly when the thread being
   debugged doesn't hold the GIL; the macro now acquires it before printing.
@@ -1459,6 +1495,10 @@
   but it's available if anyone wishes to use it.
   (Added by Mark Dickinson; :issue:`2937`.)
 
+  :program:`configure` also now sets a :envvar:`LDCXXSHARED` Makefile
+  variable for supporting C++ linking.  (Contributed by Arfrever
+  Frehtes Taifersar Arahesis; :issue:`1222585`.)
+
 * The build process now creates the necessary files for pkg-config
   support.  (Contributed by Clinton Roy; :issue:`3585`.)

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