538 lines
17 KiB
Plaintext
538 lines
17 KiB
Plaintext
+++++++++++
|
|
Python News
|
|
+++++++++++
|
|
|
|
(editors: check NEWS.help for information about editing NEWS using ReST.)
|
|
|
|
What's New in Python 3.0a4?
|
|
===========================
|
|
|
|
*Release date: XX-XXX-2008*
|
|
|
|
Core and Builtins
|
|
-----------------
|
|
|
|
- Bug #2301: Don't try decoding the source code into the original
|
|
encoding for syntax errors.
|
|
|
|
Extension Modules
|
|
-----------------
|
|
|
|
- The dl module was removed, use the ctypes module instead.
|
|
|
|
- Use wchar_t functions in _locale module.
|
|
|
|
Library
|
|
-------
|
|
|
|
- The class distutils.commands.build_py.build_py_2to3 can be used
|
|
as a build_py replacement to automatically run 2to3 on modules
|
|
that are going to be installed.
|
|
|
|
- A new pickle protocol (protocol 3) is added with explicit support
|
|
for bytes. This is the default protocol. It intentionally cannot
|
|
be unpickled by Python 2.x.
|
|
|
|
- When a pickle written by Python 2.x contains an (8-bit) str
|
|
instance, this is now decoded to a (Unicode) str instance. The
|
|
encoding used to do this defaults to ASCII, but can be overridden
|
|
via two new keyword arguments to the Unpickler class. Previously
|
|
this would create bytes instances, which is usually wrong: str
|
|
instances are often used to pickle attribute names etc., and text is
|
|
more common than binary data anyway.
|
|
|
|
- Default to ASCII as the locale.getpreferredencoding, if the POSIX
|
|
system doesn't support CODESET and LANG isn't set or doesn't
|
|
allow deduction of an encoding.
|
|
|
|
- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned value.
|
|
|
|
- Issue #719888: Updated tokenize to use a bytes API. generate_tokens has been
|
|
renamed tokenize and now works with bytes rather than strings. A new
|
|
detect_encoding function has been added for determining source file encoding
|
|
according to PEP-0263. Token sequences returned by tokenize always start
|
|
with an ENCODING token which specifies the encoding used to decode the file.
|
|
This token is used to encode the output of untokenize back to bytes.
|
|
|
|
What's New in Python 3.0a3?
|
|
===========================
|
|
|
|
*Release date: 29-Feb-2008*
|
|
|
|
Core and Builtins
|
|
-----------------
|
|
|
|
- Issue #2282: io.TextIOWrapper was not overriding seekable() from io.IOBase.
|
|
|
|
- Issue #2115: Important speedup in setting __slot__ attributes. Also
|
|
prevent a possible crash: an Abstract Base Class would try to access a slot
|
|
on a registered virtual subclass.
|
|
|
|
- Fixed repr() and str() of complex numbers with infinity or nan as real or
|
|
imaginary part.
|
|
|
|
- Clear all free list during a gc.collect() of the highest generation in order
|
|
to allow pymalloc to free more arenas. Python may give back memory to the
|
|
OS earlier.
|
|
|
|
- Issue #2045: Fix an infinite recursion triggered when printing a subclass of
|
|
collections.defaultdict, if its default_factory is set to a bound method.
|
|
|
|
- Fixed a minor memory leak in dictobject.c. The content of the free
|
|
list was not freed on interpreter shutdown.
|
|
|
|
- Limit free list of method and builtin function objects to 256 entries
|
|
each.
|
|
|
|
- Patch #1953: Added ``sys._compact_freelists()`` and the C API functions
|
|
``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
|
|
to compact the internal free lists of pre-allocted ints and floats.
|
|
|
|
- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
|
|
Python expected the return type int but the fork familie returns pi_t.
|
|
|
|
- Issue #1678380: Fix a bug that identifies 0j and -0j when they appear
|
|
in the same code unit.
|
|
|
|
- Issue #2025 : Add tuple.count() and tuple.index() methods to comply with
|
|
the collections.Sequence API.
|
|
|
|
- Fixed multiple reinitialization of the Python interpreter. The small int
|
|
list in longobject.c has caused a seg fault during the third finalization.
|
|
|
|
- Issue #1973: bytes.fromhex('') raises SystemError
|
|
|
|
- Issue #1771: remove cmp parameter from sorted() and list.sort()
|
|
|
|
- Issue #1969: split and rsplit in bytearray are inconsistent
|
|
|
|
- map() and no longer accepts None for the first argument.
|
|
Use zip() instead.
|
|
|
|
- Issue #1769: Now int("- 1") is not allowed any more.
|
|
|
|
- Object/longobject.c: long(float('nan')) raises an OverflowError instead
|
|
of returning 0.
|
|
|
|
- Issue #1762972: __file__ points to the source file instead of the pyc/pyo
|
|
file if the py file exists.
|
|
|
|
- Issue #1393: object_richcompare() returns NotImplemented instead of
|
|
False if the objects aren't equal, to give the other side a chance.
|
|
|
|
- Issue #1692: Interpreter was not displaying location of SyntaxError.
|
|
|
|
- Improve some exception messages when Windows fails to load an extension
|
|
module. Now we get for example '%1 is not a valid Win32 application' instead
|
|
of 'error code 193'. Also use Unicode strings to deal with non-English
|
|
locales.
|
|
|
|
- Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
|
|
has gained a new type *PyInstanceMethod_Type* and the functions
|
|
*PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)* and
|
|
*PyInstanceMethod_Function(im)*.
|
|
|
|
- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed from the
|
|
gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE are now enough to
|
|
print the corresponding list of objects considered by the garbage collector.
|
|
|
|
- Issue #1573: Improper use of the keyword-only syntax makes the parser crash.
|
|
|
|
- Issue #1564: The set implementation should special-case PyUnicode instead
|
|
of PyString.
|
|
|
|
- Patch #1031213: Decode source line in SyntaxErrors back to its
|
|
original source encoding.
|
|
|
|
- inspect.getsource() includes the decorators again.
|
|
|
|
- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
|
|
mountpoint.
|
|
|
|
- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
|
|
first chunk fed to the decoder started with a BOM, but was longer than 3
|
|
bytes.
|
|
|
|
|
|
Extension Modules
|
|
-----------------
|
|
|
|
- Code for itertools ifilter(), imap(), and izip() moved to bultins and
|
|
renamed to filter(), map(), and zip(). Also, renamed izip_longest()
|
|
to zip_longest() and ifilterfalse() to filterfalse().
|
|
|
|
- Issue #1762972: Readded the reload() function as imp.reload()
|
|
|
|
- Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
|
|
|
|
- #2063: correct order of utime and stime in os.times() result on Windows.
|
|
|
|
|
|
Library
|
|
-------
|
|
|
|
- Weakref dictionaries now inherit from MutableMapping.
|
|
XXX their API still needs to be modernized (i.e. eliminate the iter methods).
|
|
|
|
- Created new UserDict class in collections module. This one inherits from and
|
|
complies with the MutableMapping ABC. Also, moved UserString and UserList
|
|
to the collections module. The MutableUserString class was removed.
|
|
|
|
- Removed UserDict.DictMixin. Replaced all its uses with
|
|
collections.MutableMapping.
|
|
|
|
- Issue #1703: getpass() should flush after writing prompt.
|
|
|
|
- Issue #1585: IDLE uses non-existent xrange() function.
|
|
|
|
- Issue #1578: Problems in win_getpass.
|
|
|
|
Build
|
|
-----
|
|
|
|
- Renamed --enable-unicode configure flag to --with-wide-unicode, since
|
|
Unicode strings can't be disabled anymore.
|
|
|
|
|
|
C API
|
|
-----
|
|
|
|
- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
|
|
Py_TYPE and Py_REFCNT.
|
|
|
|
- New API PyImport_ImportModuleNoBlock(), works like PyImport_ImportModule()
|
|
but won't block on the import lock (returning an error instead).
|
|
|
|
|
|
What's New in Python 3.0a2?
|
|
===========================
|
|
|
|
*Release date: 07-Dec-2007*
|
|
|
|
(Note: this list is incomplete.)
|
|
|
|
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.
|
|
|
|
- Unbound methods are gone for good. ClassObject.method returns an ordinary
|
|
function object, instance.method still returns a bound method object.
|
|
The API of bound methods is cleaned up, too. The im_class attribute is
|
|
removed and im_func + im_self are renamed to __func__ and __self__. The
|
|
factory PyMethod_New takes only func and instance as argument.
|
|
|
|
- intobject.h is no longer included by Python.h. The remains were moved
|
|
to longobject.h. It still exists to define several aliases from PyInt_
|
|
to PyLong_ functions.
|
|
|
|
- Removed sys.maxint, use sys.maxsize instead.
|
|
|
|
|
|
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.
|
|
|
|
- Removed the 'new' module.
|
|
|
|
- Removed all types from the 'types' module that are easily accessable through
|
|
builtins.
|
|
|
|
|
|
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
|
|
-----
|
|
|
|
- Removed test.testall as test.regrtest replaces it.
|
|
|
|
|
|
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.)**
|