| +++++++++++ |
| Python News |
| +++++++++++ |
| |
| (editors: check NEWS.help for information about editing NEWS using ReST.) |
| |
| What's new in Python 3.0b1? |
| =========================== |
| |
| *Release date: XX-June-2008* |
| |
| Core and Builtins |
| ----------------- |
| |
| - Issue 2801: fix bug in the float.is_integer method where a ValueError |
| was sometimes incorrectly raised. |
| |
| Extension Modules |
| ----------------- |
| |
| Library |
| ------- |
| |
| - The Canvas module has been removed. |
| |
| - The Decimal module gained the magic methods __round__, __ceil__, |
| __floor__ and __trunc__, to give support for round, math.ceil, |
| math.floor and math.trunc. |
| |
| - The user module has been removed. |
| |
| - The mutex module has been removed. |
| |
| - The imputil module has been removed. |
| |
| - os.path.walk has been removed in favor of os.walk |
| |
| Build |
| ----- |
| |
| |
| What's New in Python 3.0a5? |
| =========================== |
| |
| *Release date: 08-May-2008* |
| |
| Core and Builtins |
| ----------------- |
| |
| - Fix misbehaviour of PyLong_FromSsize_t on systems where sizeof(size_t) > |
| sizeof(long). |
| |
| - Issue #2221: Corrected a SystemError "error return without exception set", |
| when the code executed by exec() raises an exception, and sys.stdout.flush() |
| also raises an error. |
| |
| - Bug #2565: The repr() of type objects now calls them 'class', |
| not 'type' - whether they are builtin types or not. |
| |
| - The command line processing was converted to pass Unicode strings |
| through as unmodified as possible; as a consequence, the C API |
| related to command line arguments was changed to use wchar_t. |
| |
| - All backslashes in raw strings are interpreted literally. This means that |
| '\u' and '\U' escapes are not treated specially. |
| |
| Extension Modules |
| ----------------- |
| |
| Library |
| ------- |
| |
| - ctypes objects now support the PEP3118 buffer interface |
| |
| - Issue #2682: ctypes callback functions now longer contain a cyclic |
| reference to themselves. |
| |
| - Issue #2058: Remove the buf attribute and add __slots__ to the TarInfo |
| class in order to reduce tarfile's memory usage. |
| |
| - Bug #2606: Avoid calling .sort() on a dict_keys object. |
| |
| - The bundled libffi copy is now in sync with the recently released |
| libffi3.0.5 version, apart from some small changes to |
| Modules/_ctypes/libffi/configure.ac. |
| |
| Build |
| ----- |
| |
| - Issue #1496032: On alpha, use -mieee when gcc is the compiler. |
| |
| - "make install" is now an alias for "make altinstall", to prevent |
| accidentally overwriting a Python 2.x installation. |
| Use "make fullinstall" to force Python 3.0 to be installed as |
| "python". |
| |
| - Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when |
| gcc is used as compiler. |
| |
| What's New in Python 3.0a4? |
| =========================== |
| |
| *Release date: 02-Apr-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.)** |