Various additions
This commit is contained in:
Andrew M. Kuchling
parent
c2aad8ad15
commit
b4a4f5167b
|
|
@ -49,9 +49,9 @@
|
|||
This saves the maintainer some effort going through the SVN logs
|
||||
when researching a change.
|
||||
|
||||
This article explains the new features in Python 2.7. No release
|
||||
schedule has been decided yet for 2.7; the schedule will eventually be
|
||||
described in :pep:`373`.
|
||||
This article explains the new features in Python 2.7. The final
|
||||
release of 2.7 is currently scheduled for June 2010; the detailed
|
||||
schedule is described in :pep:`373`.
|
||||
|
||||
.. Compare with previous release in 2 - 3 sentences here.
|
||||
add hyperlink when the documentation becomes available online.
|
||||
|
|
@ -301,6 +301,9 @@ Some smaller changes made to the core Python language are:
|
|||
|
||||
(Implemented by Mark Dickinson; :issue:`3166`.)
|
||||
|
||||
Integer division is also more accurate in its rounding behaviours. (Also
|
||||
implemented by Mark Dickinson; :issue:`1811`.)
|
||||
|
||||
* The :class:`bytearray` type's :meth:`translate` method now accepts
|
||||
``None`` as its first argument. (Fixed by Georg Brandl;
|
||||
:issue:`4759`.)
|
||||
|
|
@ -315,6 +318,11 @@ Some smaller changes made to the core Python language are:
|
|||
supported. (Contributed by Alexander Belchenko and Amaury Forgeot
|
||||
d'Arc; :issue:`1616979`.)
|
||||
|
||||
* Extra parentheses in function definitions are illegal in Python 3.x,
|
||||
meaning that you get a syntax error from ``def f((x)): pass``. In
|
||||
Python3-warning mode, Python 2.7 will now warn about this odd usage.
|
||||
(Noted by James Lingard; :issue:`7362`.)
|
||||
|
||||
.. ======================================================================
|
||||
|
||||
|
||||
|
|
@ -333,16 +341,16 @@ Several performance enhancements have been added:
|
|||
:keyword:`with` statements, looking up the :meth:`__enter__` and
|
||||
:meth:`__exit__` methods. (Contributed by Benjamin Peterson.)
|
||||
|
||||
* The garbage collector now performs better when many objects are
|
||||
being allocated without deallocating any. A full garbage collection
|
||||
pass is only performed when the middle generation has been collected
|
||||
10 times and when the number of survivor objects from the middle
|
||||
generation exceeds 10% of the number of objects in the oldest
|
||||
generation. The second condition was added to reduce the number
|
||||
of full garbage collections as the number of objects on the heap grows,
|
||||
avoiding quadratic performance when allocating very many objects.
|
||||
(Suggested by Martin von Loewis and implemented by Antoine Pitrou;
|
||||
:issue:`4074`.)
|
||||
* The garbage collector now performs better for one common usage
|
||||
pattern: when many objects are being allocated without deallocating
|
||||
any of them. This would previously take quadratic
|
||||
time for garbage collection, but now the number of full garbage collections
|
||||
is reduced as the number of objects on the heap grows.
|
||||
The new logic is to only perform a full garbage collection pass when
|
||||
the middle generation has been collected 10 times and when the
|
||||
number of survivor objects from the middle generation exceeds 10% of
|
||||
the number of objects in the oldest generation. (Suggested by Martin
|
||||
von Loewis and implemented by Antoine Pitrou; :issue:`4074`.)
|
||||
|
||||
* The garbage collector tries to avoid tracking simple containers
|
||||
which can't be part of a cycle. In Python 2.7, this is now true for
|
||||
|
|
@ -410,7 +418,6 @@ Several performance enhancements have been added:
|
|||
conversion function that supports arbitrary bases.
|
||||
(Patch by Gawain Bolton; :issue:`6713`.)
|
||||
|
||||
|
||||
.. ======================================================================
|
||||
|
||||
New and Improved Modules
|
||||
|
|
@ -488,7 +495,9 @@ changes, or look through the Subversion logs for all the details.
|
|||
(Added by Raymond Hettinger; :issue:`1818`.)
|
||||
|
||||
The :class:`deque` data type now exposes its maximum length as the
|
||||
read-only :attr:`maxlen` attribute. (Added by Raymond Hettinger.)
|
||||
read-only :attr:`maxlen` attribute, and has a
|
||||
:meth:`reverse` method that reverses the elements of the deque in-place.
|
||||
(Added by Raymond Hettinger.)
|
||||
|
||||
* The :mod:`ctypes` module now always converts ``None`` to a C NULL
|
||||
pointer for arguments declared as pointers. (Changed by Thomas
|
||||
|
|
@ -539,14 +548,24 @@ changes, or look through the Subversion logs for all the details.
|
|||
process, but instead simply not install the failing extension.
|
||||
(Contributed by Georg Brandl; :issue:`5583`.)
|
||||
|
||||
Issue #7457: added a read_pkg_file method to.distutils.dist.DistributionMetadata
|
||||
see file:///MacDev/svn.python.org/python-trunk/Doc/build/html/distutils/examples.html#reading-the-metadata
|
||||
(:issue:`7457`, added by Tarek).
|
||||
The :class:`distutils.dist.DistributionMetadata` class'
|
||||
:meth:`read_pkg_file` method will read the contents of a package's
|
||||
metadata file. For an example of its use,
|
||||
XXX link to file:///MacDev/svn.python.org/python-trunk/Doc/build/html/distutils/examples.html#reading-the-metadata
|
||||
(Contributed by Tarek Ziade; :issue:`7457`.)
|
||||
|
||||
* The :class:`Fraction` class now accepts two rational numbers
|
||||
as arguments to its constructor.
|
||||
(Implemented by Mark Dickinson; :issue:`5812`.)
|
||||
|
||||
* The :mod:`ftplib` module gained the ability to establish secure FTP
|
||||
connections using TLS encapsulation of authentication as well as
|
||||
subsequent control and data transfers. This is provided by the new
|
||||
:class:`ftplib.FTP_TLS` class.
|
||||
(Contributed by Giampaolo Rodola', :issue:`2054`.) The :meth:`storbinary`
|
||||
method for binary uploads can now restart uploads thanks to an added
|
||||
*rest* parameter (patch by Pablo Mouzo; :issue:`6845`.)
|
||||
|
||||
* New function: the :mod:`gc` module's :func:`is_tracked` returns
|
||||
true if a given instance is tracked by the garbage collector, false
|
||||
otherwise. (Contributed by Antoine Pitrou; :issue:`4688`.)
|
||||
|
|
@ -627,8 +646,12 @@ changes, or look through the Subversion logs for all the details.
|
|||
with any object literal that decodes to a list of pairs.
|
||||
(Contributed by Raymond Hettinger; :issue:`5381`.)
|
||||
|
||||
* New functions: the :mod:`math` module now has
|
||||
a :func:`gamma` function.
|
||||
* New functions: the :mod:`math` module gained
|
||||
:func:`erf` and :func:`erfc` for the error function and the complementary error function,
|
||||
:func:`expm1` which computes ``e**x - 1`` with more precision than
|
||||
using :func:`exp` and subtracting 1,
|
||||
:func:`gamma` for the Gamma function, and
|
||||
:func:`lgamma` for the natural log of the Gamma function.
|
||||
(Contributed by Mark Dickinson and nirinA raseliarison; :issue:`3366`.)
|
||||
|
||||
* The :mod:`multiprocessing` module's :class:`Manager*` classes
|
||||
|
|
@ -640,6 +663,13 @@ changes, or look through the Subversion logs for all the details.
|
|||
* The :mod:`nntplib` module now supports IPv6 addresses.
|
||||
(Contributed by Derek Morr; :issue:`1664`.)
|
||||
|
||||
* New functions: the :mod:`os` module wraps the following POSIX system
|
||||
calls: :func:`getresgid` and :func:`getresuid`, which return the
|
||||
real, effective, and saved GIDs and UIDs;
|
||||
:func:`setresgid` and :func:`setresuid`, which set
|
||||
real, effective, and saved GIDs and UIDs to new values. (Contributed
|
||||
by Travis H.; :issue:`6508`.)
|
||||
|
||||
* The :mod:`pydoc` module now has help for the various symbols that Python
|
||||
uses. You can now do ``help('<<')`` or ``help('@')``, for example.
|
||||
(Contributed by David Laban; :issue:`4739`.)
|
||||
|
|
@ -728,12 +758,6 @@ changes, or look through the Subversion logs for all the details.
|
|||
:mod:`zipfile` now supports archiving empty directories and
|
||||
extracts them correctly. (Fixed by Kuba Wieczorek; :issue:`4710`.)
|
||||
|
||||
* The :mod:`ftplib` module gains the ability to establish secure FTP
|
||||
connections using TLS encapsulation of authentication as well as
|
||||
subsequent control and data transfers. This is provided by the new
|
||||
:class:`ftplib.FTP_TLS` class.
|
||||
(Contributed by Giampaolo Rodola', :issue:`2054`.)
|
||||
|
||||
.. ======================================================================
|
||||
.. whole new modules get described in subsections here
|
||||
|
||||
|
|
@ -934,6 +958,12 @@ Changes to Python's build process and to the C API include:
|
|||
extensions needed to call :cfunc:`PyCode_New`, which had many
|
||||
more arguments. (Added by Jeffrey Yasskin.)
|
||||
|
||||
* New function: :cfunc:`PyErr_NewExceptionWithDoc` creates a new
|
||||
exception class, just as the existing :cfunc:`PyErr_NewException` does,
|
||||
but takes an extra ``char *`` argument containing the docstring for the
|
||||
new exception class. (Added by the 'lekma' user on the Python bug tracker;
|
||||
:issue:`7033`.)
|
||||
|
||||
* New function: :cfunc:`PyFrame_GetLineNumber` takes a frame object
|
||||
and returns the line number that the frame is currently executing.
|
||||
Previously code would need to get the index of the bytecode
|
||||
|
|
@ -992,6 +1022,12 @@ Changes to Python's build process and to the C API include:
|
|||
* The build process now supports Subversion 1.7. (Contributed by
|
||||
Arfrever Frehtes Taifersar Arahesis; :issue:`6094`.)
|
||||
|
||||
* Compiling Python with the :option:`--with-valgrind` option will now
|
||||
disable the pymalloc allocator, which is difficult for the Valgrind to
|
||||
analyze correctly. Valgrind will therefore be better at detecting
|
||||
memory leaks and overruns. (Contributed by James Henstridge; :issue:`2422`.)
|
||||
|
||||
|
||||
.. ======================================================================
|
||||
|
||||
Port-Specific Changes: Windows
|
||||
|
|
@ -1070,6 +1106,10 @@ that may require changes to your code:
|
|||
affects new-style classes (derived from :class:`object`) and C extension
|
||||
types. (:issue:`6101`.)
|
||||
|
||||
* The :meth:`readline` method of :class:`StringIO` objects now does
|
||||
nothing when a negative length is requested, as other file-like
|
||||
objects do. (:issue:`7348`).
|
||||
|
||||
.. ======================================================================
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue