[Python-checkins] r87076 - python/branches/py3k/Doc/whatsnew/3.2.rst

Sun Dec 5 06:39:55 CET 2010

Author: raymond.hettinger
Date: Sun Dec 5 06:39:54 2010
New Revision: 87076
Log:
Optimization notes.
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	Sun Dec 5 06:39:54 2010
@@ -348,6 +348,11 @@
 the context manager protocol. This allows timely release of any resources
 that were acquired when requesting a buffer from the original object.
 
+ >>> with memoryview(b'abcdefgh') as v:
+ ... print(v.tolist())
+ ...
+ [97, 98, 99, 100, 101, 102, 103, 104]
+
 (Added by Antoine Pitrou; :issue:`9757`.)
 
 * Mark Dickinson crafted an elegant and efficient scheme for assuring that
@@ -389,13 +394,11 @@
 can be enabled through the means provided by the :mod:`warnings`
 module, or on the command line.
 
- :exc:`ResourceWarning` is issued at interpreter shutdown if the
+ A :exc:`ResourceWarning` is issued at interpreter shutdown if the
 :data:`gc.garbage` list isn't empty. This is meant to make the programmer
 aware that their code contains object finalization issues.
 
- (Added by Antoine Pitrou and Georg Brandl; :issue:`477863`.)
-
- :exc:`ResourceWarning` is also issued when a :term:`file object` is destroyed
+ A :exc:`ResourceWarning` is also issued when a :term:`file object` is destroyed
 without having been explicitly closed. While the deallocator for such
 object ensures it closes the underlying operating system resource
 (usually, a file descriptor), the delay in deallocating the object could
@@ -411,7 +414,7 @@
 __main__:1: ResourceWarning: unclosed file <_io.BufferedWriter name='foo'>
 >>>
 
- (Added by Antoine Pitrou, :issue:`10093`.)
+ (Added by Antoine Pitrou and Georg Brandl in :issue:`10093` and :issue:`477863`.)
 
 * :class:`range` objects now support and *index* and *count* methods. This is
 part of an effort to make more objects fully implement the :class:`collections.Sequence`
@@ -424,6 +427,11 @@
 (Contributed by Daniel Stuzback in :issue:`9213` and by Alexander Belopolsky
 in :issue:`2690`.)
 
+* The :func:`callable` builtin function from Py2.x was resurrected. It provides
+ a concise, readable alternative to using an :term:`abstract base class` to in
+ an expression like ``isinstance(x, collections.Callable)``.
+
+ (See :issue:`10518`.)
 
 New, Improved, and Deprecated Modules
 =====================================
@@ -802,6 +810,15 @@
 
 (Patch by Florent Xicluna in :issue:`7622` and :issue:`7462`.)
 
+There were several other minor optimizations. Set differencing now runs faster
+when one operand is much larger than the other (Patch by Andress Bennetts in
+:issue:`8685`). The :meth:`array.repeat` method has a faster implementation
+(:issue:`1569291` by Alexander Belopolsky). The :class:`BaseHTTPRequestHandler`
+has more efficient buffering (:issue:`3709` by Andrew Schaaf). The
+multi-argument form of :func:`operator.attrgetter` now function runs slightly
+faster (:issue:`10160` by Christos Georgiou). And :class:`ConfigParser` loads
+multi-line arguments a bit faster (:issue:`7113` by Łukasz Langa).
+
 
 Unicode
 =======
