Misc/NEWS - platform/external/python/cpython3 - Gitiles

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

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

 What's New in Python 3000?
 ==========================

 *Release date: XX-XXX-200X*

 TO DO
 -----

 - See PEP 3000, 3100.

 - Weed really old/weird stuff from the library.

 - Use io.py instead of C stdio everywhere.

 - Make strings all Unicode (see branches/py3k-struni).

 - Get rid of various compatibility-related flags (e.g. division flags).


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

 - 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 teh
   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 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.

 - 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(), 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 returns an iterator

 - Additions:
   set literals, 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:
   * Bastion, bsddb185, exceptions, md5, MimeWriter, mimify, popen2, rexec,
     sets, sha, stringold, strop, timing, xmllib.

 - 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 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.


 Build
 -----

 C API
 -----

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

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

 - Removed these C slots/fields:
   nb_divide, nb_inplace_divide

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

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


 Tests
 -----

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

 Mac
 ---

 - The cfmfile was removed.


 New platforms
 -------------

 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 3000?
	==========================

	Release date: XX-XXX-200X

	TO DO
	-----

	- See PEP 3000, 3100.

	- Weed really old/weird stuff from the library.

	- Use io.py instead of C stdio everywhere.

	- Make strings all Unicode (see branches/py3k-struni).

	- Get rid of various compatibility-related flags (e.g. division flags).


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

	- 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 teh
	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 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.

	- 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(), 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 returns an iterator

	- Additions:
	set literals, 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:
	* Bastion, bsddb185, exceptions, md5, MimeWriter, mimify, popen2, rexec,
	sets, sha, stringold, strop, timing, xmllib.

	- 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 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.


	Build
	-----

	C API
	-----

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

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

	- Removed these C slots/fields:
	nb_divide, nb_inplace_divide

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

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


	Tests
	-----

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

	Mac
	---

	- The cfmfile was removed.


	New platforms
	-------------

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

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