Misc/NEWS - platform/external/python/cpython2 - Gitiles

 +++++++++++
 Python News
 +++++++++++

 (editors: check NEWS.help for information about editing NEWS using ReST.)

 What's New in Python 3.0a2?

 *Unreleased*

 Core and Builtins
 -----------------

 - str8 now has the same construction signature as bytes.

 - Comparisons between str and str8 now return False/True for ==/!=.  sqlite3
   returns str8 when recreating on object from it's __conform__ value.  The
   struct module returns str8 for all string-related formats.  This was true
   before this change, but becomes more apparent thanks to string comparisons
   always being False.

 - Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
   encoding, newline)`

 - Fixed `imp.find_module()` to obey the -*- coding: -*- header.

 - Changed `__file__` and `co_filename` to unicode. The path names are decoded
   with `Py_FileSystemDefaultEncoding` and a new API method
   `PyUnicode_DecodeFSDefault(char*)` was added.

 - io.open() and _fileio.FileIO have grown a new argument closefd. A false
   value disables the closing of the file descriptor.

 - Added a new option -b to issues warnings (-bb for errors) about certain
   operations between bytes/buffer and str like str(b'') and comparsion.

 - The standards streams sys.stdin, stdout and stderr may be None when the
   when the C runtime library returns an invalid file descriptor for the
   streams (fileno(stdin) < 0). For now this happens only for Windows GUI
   apps and scripts started with `pythonw.exe`.

 - Added PCbuild9 directory for VS 2008.

 - Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
   around a name clash with VS 2008 on Windows.


 Extension Modules
 -----------------

 - The `hotshot` profiler has been removed; use `cProfile` instead.


 Library
 -------

 - When loading an external file using testfile(), the passed-in encoding
   argument was being ignored if __loader__ is defined and forcing the source to
   be UTF-8.

 - The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
   removed in favor of the tempfile module.


 What's New in Python 3.0a1?
 ==========================

 *Release date: 31-Aug-2007*


 Core and Builtins
 -----------------

 - PEP 3131: Support non-ASCII identifiers.

 - PEP 3120: Change default encoding to UTF-8.

 - PEP 3123: Use proper C inheritance for PyObject.

 - Removed the __oct__ and __hex__ special methods and added a bin()
   builtin function.

 - PEP 3127: octal literals now start with "0o". Old-style octal literals
   are invalid. There are binary literals with a prefix of "0b".
   This also affects int(x, 0).

 - None, True, False are now keywords.

 - PEP 3119: isinstance() and issubclass() can be overridden.

 - Remove BaseException.message.

 - Remove tuple parameter unpacking (PEP 3113).

 - Remove the f_restricted attribute from frames.  This naturally leads to the
   removal of PyEval_GetRestricted() and PyFrame_IsRestricted().

 - PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
   to assign 0 to a and [1, 2, 3, 4] to b.

 - range() now returns an iterator rather than a list.  Floats are not allowed.
   xrange() is no longer defined.

 - Patch #1660500: hide iteration variable in list comps, add set comps
   and use common code to handle compilation of iterative expressions

 - By default, != returns the opposite of ==, unless the latter returns
   NotImplemented.

 - Patch #1680961: sys.exitfunc has been removed and replaced with a private
   C-level API.

 - PEP 3115: new metaclasses: the metaclass is now specified as a
   keyword arg in the class statement, which can now use the full syntax of
   a parameter list. Also, the metaclass can implement a __prepare__ function
   which will be called to create the dictionary for the new class namespace.

 - The long-deprecated argument "pend" of PyFloat_FromString() has been
   removed.

 - The dir() function has been extended to call the __dir__() method on
   its argument, if it exists. If not, it will work like before. This allows
   customizing the output of dir() in the presence of a __getattr__().

 - Removed support for __members__ and __methods__.

 - Removed indexing/slicing on BaseException.

 - input() became raw_input(): the name input() now implements the
   functionality formerly known as raw_input(); the name raw_input()
   is no longer defined.

 - Classes listed in an 'except' clause must inherit from BaseException.

 - PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
   and .keys(), .items(), .values() return dict views, which behave
   like sets.

 - PEP 3105: print is now a function.  Also (not in the PEP) the
   'softspace' attribute of files is now gone (since print() doesn't use
   it).  A side effect of this change is that you can get incomplete
   output lines in interactive sessions:

   >>> print(42, end="")
   42>>>

   We may be able to fix this after the I/O library rewrite.

 - PEP 3102: keyword-only arguments.

 - Int/Long unification is complete.  The 'long' built-in type
   and literals with trailing 'L' or 'l' have been removed.
   Performance may be sub-optimal (haven't really benchmarked).

 - 'except E, V' must now be spelled as 'except E as V' and deletes V
   at the end of the except clause; V must be a simple name.

 - Added function annotations per PEP 3107.

 - Added nonlocal declaration from PEP 3104

   >>> def f(x):
   ...     def inc():
   ...         nonlocal x
   ...         x += 1
   ...         return x
   ...     return inc
   ...
   >>> inc = f(0)
   >>> inc()
   1
   >>> inc()
   2

 - Moved intern() to sys.intern().

 - exec is now a function.

 - Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.

 - Classic classes are a thing of the past.  All classes are new style.

 - Exceptions *must* derive from BaseException.

 - Integer division always returns a float.  The -Q option is no more.
   All the following are gone:
    * PyNumber_Divide and PyNumber_InPlaceDivide
    * __div__, __rdiv__, and __idiv__
    * nb_divide, nb_inplace_divide
    * operator.div, operator.idiv, operator.__div__, operator.__idiv__
   (Only __truediv__ and __floordiv__ remain, not sure how to handle them
    if we want to re-use __div__ and friends.  If we do, it will make
    it harder to write code for both 2.x and 3.x.)

 - 'as' and 'with' are keywords.

 - Absolute import is the default behavior for 'import foo' etc.

 - Removed support for syntax:
   backticks (ie, `x`), <>

 - Removed these Python builtins:
   apply(), callable(), coerce(), execfile(), file(), reduce(), reload()

 - Removed these Python methods:
   {}.has_key

 - Removed these opcodes:
   BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT

 - Remove C API support for restricted execution.

 - zip(), map() and filter() now return iterators, behaving like their
   itertools counterparts. This also affect map()'s behavior on
   sequences of unequal length -- it now stops after the shortest one
   is exhausted.

 - Additions:
   set literals, set comprehensions, ellipsis literal.

 - Added class decorators per PEP 3129.


 Extension Modules
 -----------------

 - Remove the imageop module.  Obsolete long with its unit tests becoming
   useless from the removal of rgbimg and imgfile.

 - Removed these attributes from Python modules:
   * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
   * sys module: exc_clear(), exc_type, exc_value, exc_traceback


 Library
 -------

 - Remove the compiler package.  Use of the _ast module and (an eventual)
   AST -> bytecode mechanism.

 - Removed these modules:
   * audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
     md5, MimeWriter, mimify, popen2,
     rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.

 - Moved these modules to Tools/Demos:
   * toaiff

 - Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
   ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
   panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.

 - Remove obsolete functions:
   * commands.getstatus(), os.popen*,

 - Remove functions in the string module that are also string methods;
   Remove string.{letters, lowercase, uppercase}.

 - Remove support for long obsolete platforms: plat-aix3, plat-irix5.

 - Remove xmlrpclib.SlowParser.  It was based on xmllib.

 - Patch #1680961: atexit has been reimplemented in C.

 - Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.


 Build
 -----

 C API
 -----

 - Removed these Python slots:
   __coerce__, __div__, __idiv__, __rdiv__

 - Removed these C APIs:
   PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set

 - Removed these C slots/fields:
   nb_divide, nb_inplace_divide

 - Removed these macros:
   staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del

 - Removed these typedefs:
   intargfunc, intintargfunc, intobjargproc, intintobjargproc,
   getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
   memberlist


 Tests
 -----

 Documentation
 -------------

 Mac
 ---

 - The cfmfile was removed.


 Platforms
 ---------

 - Support for BeOS and AtheOS was removed (according to PEP 11).

 - Support for RiscOS, Irix, Tru64 was removed (alledgedly).


 Tools/Demos
 -----------

 **(For information about older versions, consult the HISTORY file.)**
	+++++++++++
	Python News
	+++++++++++

	(editors: check NEWS.help for information about editing NEWS using ReST.)

	What's New in Python 3.0a2?

	Unreleased

	Core and Builtins
	-----------------

	- str8 now has the same construction signature as bytes.

	- Comparisons between str and str8 now return False/True for ==/!=. sqlite3
	returns str8 when recreating on object from it's __conform__ value. The
	struct module returns str8 for all string-related formats. This was true
	before this change, but becomes more apparent thanks to string comparisons
	always being False.

	- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
	encoding, newline)`

	- Fixed `imp.find_module()` to obey the -- coding: -- header.

	- Changed `__file__` and `co_filename` to unicode. The path names are decoded
	with `Py_FileSystemDefaultEncoding` and a new API method
	`PyUnicode_DecodeFSDefault(char*)` was added.

	- io.open() and _fileio.FileIO have grown a new argument closefd. A false
	value disables the closing of the file descriptor.

	- Added a new option -b to issues warnings (-bb for errors) about certain
	operations between bytes/buffer and str like str(b'') and comparsion.

	- The standards streams sys.stdin, stdout and stderr may be None when the
	when the C runtime library returns an invalid file descriptor for the
	streams (fileno(stdin) < 0). For now this happens only for Windows GUI
	apps and scripts started with `pythonw.exe`.

	- Added PCbuild9 directory for VS 2008.

	- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
	around a name clash with VS 2008 on Windows.


	Extension Modules
	-----------------

	- The `hotshot` profiler has been removed; use `cProfile` instead.


	Library
	-------

	- When loading an external file using testfile(), the passed-in encoding
	argument was being ignored if __loader__ is defined and forcing the source to
	be UTF-8.

	- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
	removed in favor of the tempfile module.


	What's New in Python 3.0a1?
	==========================

	Release date: 31-Aug-2007


	Core and Builtins
	-----------------

	- PEP 3131: Support non-ASCII identifiers.

	- PEP 3120: Change default encoding to UTF-8.

	- PEP 3123: Use proper C inheritance for PyObject.

	- Removed the __oct__ and __hex__ special methods and added a bin()
	builtin function.

	- PEP 3127: octal literals now start with "0o". Old-style octal literals
	are invalid. There are binary literals with a prefix of "0b".
	This also affects int(x, 0).

	- None, True, False are now keywords.

	- PEP 3119: isinstance() and issubclass() can be overridden.

	- Remove BaseException.message.

	- Remove tuple parameter unpacking (PEP 3113).

	- Remove the f_restricted attribute from frames. This naturally leads to the
	removal of PyEval_GetRestricted() and PyFrame_IsRestricted().

	- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
	to assign 0 to a and [1, 2, 3, 4] to b.

	- range() now returns an iterator rather than a list. Floats are not allowed.
	xrange() is no longer defined.

	- Patch #1660500: hide iteration variable in list comps, add set comps
	and use common code to handle compilation of iterative expressions

	- By default, != returns the opposite of ==, unless the latter returns
	NotImplemented.

	- Patch #1680961: sys.exitfunc has been removed and replaced with a private
	C-level API.

	- PEP 3115: new metaclasses: the metaclass is now specified as a
	keyword arg in the class statement, which can now use the full syntax of
	a parameter list. Also, the metaclass can implement a __prepare__ function
	which will be called to create the dictionary for the new class namespace.

	- The long-deprecated argument "pend" of PyFloat_FromString() has been
	removed.

	- The dir() function has been extended to call the __dir__() method on
	its argument, if it exists. If not, it will work like before. This allows
	customizing the output of dir() in the presence of a __getattr__().

	- Removed support for __members__ and __methods__.

	- Removed indexing/slicing on BaseException.

	- input() became raw_input(): the name input() now implements the
	functionality formerly known as raw_input(); the name raw_input()
	is no longer defined.

	- Classes listed in an 'except' clause must inherit from BaseException.

	- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
	and .keys(), .items(), .values() return dict views, which behave
	like sets.

	- PEP 3105: print is now a function. Also (not in the PEP) the
	'softspace' attribute of files is now gone (since print() doesn't use
	it). A side effect of this change is that you can get incomplete
	output lines in interactive sessions:

	>>> print(42, end="")
	42>>>

	We may be able to fix this after the I/O library rewrite.

	- PEP 3102: keyword-only arguments.

	- Int/Long unification is complete. The 'long' built-in type
	and literals with trailing 'L' or 'l' have been removed.
	Performance may be sub-optimal (haven't really benchmarked).

	- 'except E, V' must now be spelled as 'except E as V' and deletes V
	at the end of the except clause; V must be a simple name.

	- Added function annotations per PEP 3107.

	- Added nonlocal declaration from PEP 3104

	>>> def f(x):
	... def inc():
	... nonlocal x
	... x += 1
	... return x
	... return inc
	...
	>>> inc = f(0)
	>>> inc()
	1
	>>> inc()
	2

	- Moved intern() to sys.intern().

	- exec is now a function.

	- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.

	- Classic classes are a thing of the past. All classes are new style.

	- Exceptions must derive from BaseException.

	- Integer division always returns a float. The -Q option is no more.
	All the following are gone:
	* PyNumber_Divide and PyNumber_InPlaceDivide
	* __div__, __rdiv__, and __idiv__
	* nb_divide, nb_inplace_divide
	* operator.div, operator.idiv, operator.__div__, operator.__idiv__
	(Only __truediv__ and __floordiv__ remain, not sure how to handle them
	if we want to re-use __div__ and friends. If we do, it will make
	it harder to write code for both 2.x and 3.x.)

	- 'as' and 'with' are keywords.

	- Absolute import is the default behavior for 'import foo' etc.

	- Removed support for syntax:
	backticks (ie, `x`), <>

	- Removed these Python builtins:
	apply(), callable(), coerce(), execfile(), file(), reduce(), reload()

	- Removed these Python methods:
	{}.has_key

	- Removed these opcodes:
	BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT

	- Remove C API support for restricted execution.

	- zip(), map() and filter() now return iterators, behaving like their
	itertools counterparts. This also affect map()'s behavior on
	sequences of unequal length -- it now stops after the shortest one
	is exhausted.

	- Additions:
	set literals, set comprehensions, ellipsis literal.

	- Added class decorators per PEP 3129.


	Extension Modules
	-----------------

	- Remove the imageop module. Obsolete long with its unit tests becoming
	useless from the removal of rgbimg and imgfile.

	- Removed these attributes from Python modules:
	* operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
	* sys module: exc_clear(), exc_type, exc_value, exc_traceback


	Library
	-------

	- Remove the compiler package. Use of the _ast module and (an eventual)
	AST -> bytecode mechanism.

	- Removed these modules:
	* audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
	md5, MimeWriter, mimify, popen2,
	rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.

	- Moved these modules to Tools/Demos:
	* toaiff

	- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
	ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
	panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.

	- Remove obsolete functions:
	* commands.getstatus(), os.popen*,

	- Remove functions in the string module that are also string methods;
	Remove string.{letters, lowercase, uppercase}.

	- Remove support for long obsolete platforms: plat-aix3, plat-irix5.

	- Remove xmlrpclib.SlowParser. It was based on xmllib.

	- Patch #1680961: atexit has been reimplemented in C.

	- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.


	Build
	-----

	C API
	-----

	- Removed these Python slots:
	__coerce__, __div__, __idiv__, __rdiv__

	- Removed these C APIs:
	PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set

	- Removed these C slots/fields:
	nb_divide, nb_inplace_divide

	- Removed these macros:
	staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del

	- Removed these typedefs:
	intargfunc, intintargfunc, intobjargproc, intintobjargproc,
	getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
	memberlist


	Tests
	-----

	Documentation
	-------------

	Mac
	---

	- The cfmfile was removed.


	Platforms
	---------

	- Support for BeOS and AtheOS was removed (according to PEP 11).

	- Support for RiscOS, Irix, Tru64 was removed (alledgedly).


	Tools/Demos
	-----------

	(For information about older versions, consult the HISTORY file.)