583 lines
18 KiB
Plaintext
583 lines
18 KiB
Plaintext
+++++++++++
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Python News
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+++++++++++
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(editors: check NEWS.help for information about editing NEWS using ReST.)
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What's New in Python 3.0a5?
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===========================
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*Release date: XX-XXX-2008*
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Core and Builtins
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-----------------
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- Issue #2221: Corrected a SystemError "error return without exception set",
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when the code executed by exec() raises an exception, and sys.stdout.flush()
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also raises an error.
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- Bug #2565: The repr() of type objects now calls them 'class',
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not 'type' - whether they are builtin types or not.
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- The command line processing was converted to pass Unicode strings
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through as unmodified as possible; as a consequence, the C API
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related to command line arguments was changed to use wchar_t.
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Extension Modules
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-----------------
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Library
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-------
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- Issue #2058: Remove the buf attribute and add __slots__ to the TarInfo
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class in order to reduce tarfile's memory usage.
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- Bug #2606: Avoid calling .sort() on a dict_keys object.
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- The bundled libffi copy is now in sync with the recently released
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libffi3.0.5 version, apart from some small changes to
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Modules/_ctypes/libffi/configure.ac.
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Build
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-----
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- "make install" is now an alias for "make altinstall", to prevent
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accidentally overwriting a Python 2.x installation.
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Use "make fullinstall" to force Python 3.0 to be installed as
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"python".
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- Issue #2544: On HP-UX systems, use 'gcc -shared' for linking when
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gcc is used as compiler.
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What's New in Python 3.0a4?
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===========================
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*Release date: 02-Apr-2008*
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Core and Builtins
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-----------------
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- Bug #2301: Don't try decoding the source code into the original
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encoding for syntax errors.
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Extension Modules
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-----------------
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- The dl module was removed, use the ctypes module instead.
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- Use wchar_t functions in _locale module.
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Library
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-------
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- The class distutils.commands.build_py.build_py_2to3 can be used
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as a build_py replacement to automatically run 2to3 on modules
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that are going to be installed.
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- A new pickle protocol (protocol 3) is added with explicit support
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for bytes. This is the default protocol. It intentionally cannot
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be unpickled by Python 2.x.
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- When a pickle written by Python 2.x contains an (8-bit) str
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instance, this is now decoded to a (Unicode) str instance. The
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encoding used to do this defaults to ASCII, but can be overridden
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via two new keyword arguments to the Unpickler class. Previously
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this would create bytes instances, which is usually wrong: str
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instances are often used to pickle attribute names etc., and text is
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more common than binary data anyway.
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- Default to ASCII as the locale.getpreferredencoding, if the POSIX
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system doesn't support CODESET and LANG isn't set or doesn't
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allow deduction of an encoding.
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- Issue #1202: zlib.crc32 and zlib.adler32 now return an unsigned value.
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- Issue #719888: Updated tokenize to use a bytes API. generate_tokens has been
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renamed tokenize and now works with bytes rather than strings. A new
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detect_encoding function has been added for determining source file encoding
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according to PEP-0263. Token sequences returned by tokenize always start
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with an ENCODING token which specifies the encoding used to decode the file.
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This token is used to encode the output of untokenize back to bytes.
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What's New in Python 3.0a3?
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===========================
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*Release date: 29-Feb-2008*
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Core and Builtins
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-----------------
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- Issue #2282: io.TextIOWrapper was not overriding seekable() from io.IOBase.
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- Issue #2115: Important speedup in setting __slot__ attributes. Also
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prevent a possible crash: an Abstract Base Class would try to access a slot
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on a registered virtual subclass.
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- Fixed repr() and str() of complex numbers with infinity or nan as real or
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imaginary part.
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- Clear all free list during a gc.collect() of the highest generation in order
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to allow pymalloc to free more arenas. Python may give back memory to the
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OS earlier.
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- Issue #2045: Fix an infinite recursion triggered when printing a subclass of
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collections.defaultdict, if its default_factory is set to a bound method.
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- Fixed a minor memory leak in dictobject.c. The content of the free
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list was not freed on interpreter shutdown.
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- Limit free list of method and builtin function objects to 256 entries
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each.
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- Patch #1953: Added ``sys._compact_freelists()`` and the C API functions
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``PyInt_CompactFreeList`` and ``PyFloat_CompactFreeList``
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to compact the internal free lists of pre-allocted ints and floats.
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- Bug #1983: Fixed return type of fork(), fork1() and forkpty() calls.
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Python expected the return type int but the fork familie returns pi_t.
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- Issue #1678380: Fix a bug that identifies 0j and -0j when they appear
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in the same code unit.
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- Issue #2025 : Add tuple.count() and tuple.index() methods to comply with
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the collections.Sequence API.
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- Fixed multiple reinitialization of the Python interpreter. The small int
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list in longobject.c has caused a seg fault during the third finalization.
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- Issue #1973: bytes.fromhex('') raises SystemError
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- Issue #1771: remove cmp parameter from sorted() and list.sort()
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- Issue #1969: split and rsplit in bytearray are inconsistent
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- map() and no longer accepts None for the first argument.
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Use zip() instead.
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- Issue #1769: Now int("- 1") is not allowed any more.
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- Object/longobject.c: long(float('nan')) raises an OverflowError instead
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of returning 0.
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- Issue #1762972: __file__ points to the source file instead of the pyc/pyo
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file if the py file exists.
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- Issue #1393: object_richcompare() returns NotImplemented instead of
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False if the objects aren't equal, to give the other side a chance.
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- Issue #1692: Interpreter was not displaying location of SyntaxError.
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- Improve some exception messages when Windows fails to load an extension
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module. Now we get for example '%1 is not a valid Win32 application' instead
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of 'error code 193'. Also use Unicode strings to deal with non-English
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locales.
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- Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
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has gained a new type *PyInstanceMethod_Type* and the functions
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*PyInstanceMethod_Check(o)*, *PyInstanceMethod_New(func)* and
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*PyInstanceMethod_Function(im)*.
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- Constants gc.DEBUG_OBJECT and gc.DEBUG_INSTANCE have been removed from the
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gc module; gc.DEBUG_COLLECTABLE or gc.DEBUG_UNCOLLECTABLE are now enough to
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print the corresponding list of objects considered by the garbage collector.
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- Issue #1573: Improper use of the keyword-only syntax makes the parser crash.
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- Issue #1564: The set implementation should special-case PyUnicode instead
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of PyString.
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- Patch #1031213: Decode source line in SyntaxErrors back to its
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original source encoding.
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- inspect.getsource() includes the decorators again.
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- Bug #1713: posixpath.ismount() claims symlink to a mountpoint is a
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mountpoint.
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- Fix utf-8-sig incremental decoder, which didn't recognise a BOM when the
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first chunk fed to the decoder started with a BOM, but was longer than 3
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bytes.
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Extension Modules
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-----------------
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- Code for itertools ifilter(), imap(), and izip() moved to bultins and
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renamed to filter(), map(), and zip(). Also, renamed izip_longest()
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to zip_longest() and ifilterfalse() to filterfalse().
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- Issue #1762972: Readded the reload() function as imp.reload()
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- Bug #2111: mmap segfaults when trying to write a block opened with PROT_READ
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- #2063: correct order of utime and stime in os.times() result on Windows.
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Library
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-------
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- Weakref dictionaries now inherit from MutableMapping.
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XXX their API still needs to be modernized (i.e. eliminate the iter methods).
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- Created new UserDict class in collections module. This one inherits from and
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complies with the MutableMapping ABC. Also, moved UserString and UserList
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to the collections module. The MutableUserString class was removed.
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- Removed UserDict.DictMixin. Replaced all its uses with
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collections.MutableMapping.
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- Issue #1703: getpass() should flush after writing prompt.
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- Issue #1585: IDLE uses non-existent xrange() function.
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- Issue #1578: Problems in win_getpass.
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Build
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-----
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- Renamed --enable-unicode configure flag to --with-wide-unicode, since
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Unicode strings can't be disabled anymore.
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C API
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-----
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- Issue #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE,
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Py_TYPE and Py_REFCNT.
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- New API PyImport_ImportModuleNoBlock(), works like PyImport_ImportModule()
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but won't block on the import lock (returning an error instead).
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What's New in Python 3.0a2?
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===========================
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*Release date: 07-Dec-2007*
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(Note: this list is incomplete.)
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Core and Builtins
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-----------------
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- str8 now has the same construction signature as bytes.
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- Comparisons between str and str8 now return False/True for ==/!=. sqlite3
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returns str8 when recreating on object from it's __conform__ value. The
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struct module returns str8 for all string-related formats. This was true
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before this change, but becomes more apparent thanks to string comparisons
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always being False.
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- Replaced `PyFile_FromFile()` with `PyFile_FromFd(fd, name. mode, buffer,
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encoding, newline)`
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- Fixed `imp.find_module()` to obey the -*- coding: -*- header.
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- Changed `__file__` and `co_filename` to unicode. The path names are decoded
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with `Py_FileSystemDefaultEncoding` and a new API method
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`PyUnicode_DecodeFSDefault(char*)` was added.
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- io.open() and _fileio.FileIO have grown a new argument closefd. A false
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value disables the closing of the file descriptor.
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- Added a new option -b to issues warnings (-bb for errors) about certain
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operations between bytes/buffer and str like str(b'') and comparsion.
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- The standards streams sys.stdin, stdout and stderr may be None when the
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when the C runtime library returns an invalid file descriptor for the
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streams (fileno(stdin) < 0). For now this happens only for Windows GUI
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apps and scripts started with `pythonw.exe`.
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- Added PCbuild9 directory for VS 2008.
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- Renamed structmember.h WRITE_RESTRICTED to PY_WRITE_RESTRICTED to work
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around a name clash with VS 2008 on Windows.
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- Unbound methods are gone for good. ClassObject.method returns an ordinary
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function object, instance.method still returns a bound method object.
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The API of bound methods is cleaned up, too. The im_class attribute is
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removed and im_func + im_self are renamed to __func__ and __self__. The
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factory PyMethod_New takes only func and instance as argument.
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- intobject.h is no longer included by Python.h. The remains were moved
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to longobject.h. It still exists to define several aliases from PyInt_
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to PyLong_ functions.
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- Removed sys.maxint, use sys.maxsize instead.
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Extension Modules
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-----------------
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- The `hotshot` profiler has been removed; use `cProfile` instead.
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Library
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-------
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- When loading an external file using testfile(), the passed-in encoding
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argument was being ignored if __loader__ is defined and forcing the source to
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be UTF-8.
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- The methods `os.tmpnam()`, `os.tempnam()` and `os.tmpfile()` have been
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removed in favor of the tempfile module.
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- Removed the 'new' module.
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- Removed all types from the 'types' module that are easily accessable through
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builtins.
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What's New in Python 3.0a1?
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==========================
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*Release date: 31-Aug-2007*
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Core and Builtins
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-----------------
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- PEP 3131: Support non-ASCII identifiers.
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- PEP 3120: Change default encoding to UTF-8.
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- PEP 3123: Use proper C inheritance for PyObject.
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- Removed the __oct__ and __hex__ special methods and added a bin()
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builtin function.
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- PEP 3127: octal literals now start with "0o". Old-style octal literals
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are invalid. There are binary literals with a prefix of "0b".
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This also affects int(x, 0).
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- None, True, False are now keywords.
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- PEP 3119: isinstance() and issubclass() can be overridden.
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- Remove BaseException.message.
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- Remove tuple parameter unpacking (PEP 3113).
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- Remove the f_restricted attribute from frames. This naturally leads to the
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removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
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- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
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to assign 0 to a and [1, 2, 3, 4] to b.
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- range() now returns an iterator rather than a list. Floats are not allowed.
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xrange() is no longer defined.
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- Patch #1660500: hide iteration variable in list comps, add set comps
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and use common code to handle compilation of iterative expressions
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- By default, != returns the opposite of ==, unless the latter returns
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NotImplemented.
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- Patch #1680961: sys.exitfunc has been removed and replaced with a private
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C-level API.
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- PEP 3115: new metaclasses: the metaclass is now specified as a
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keyword arg in the class statement, which can now use the full syntax of
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a parameter list. Also, the metaclass can implement a __prepare__ function
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which will be called to create the dictionary for the new class namespace.
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- The long-deprecated argument "pend" of PyFloat_FromString() has been
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removed.
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- The dir() function has been extended to call the __dir__() method on
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its argument, if it exists. If not, it will work like before. This allows
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customizing the output of dir() in the presence of a __getattr__().
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- Removed support for __members__ and __methods__.
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- Removed indexing/slicing on BaseException.
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- input() became raw_input(): the name input() now implements the
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functionality formerly known as raw_input(); the name raw_input()
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is no longer defined.
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- Classes listed in an 'except' clause must inherit from BaseException.
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- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
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and .keys(), .items(), .values() return dict views, which behave
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like sets.
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- PEP 3105: print is now a function. Also (not in the PEP) the
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'softspace' attribute of files is now gone (since print() doesn't use
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it). A side effect of this change is that you can get incomplete
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output lines in interactive sessions:
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>>> print(42, end="")
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42>>>
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We may be able to fix this after the I/O library rewrite.
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- PEP 3102: keyword-only arguments.
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- Int/Long unification is complete. The 'long' built-in type
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and literals with trailing 'L' or 'l' have been removed.
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Performance may be sub-optimal (haven't really benchmarked).
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- 'except E, V' must now be spelled as 'except E as V' and deletes V
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at the end of the except clause; V must be a simple name.
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- Added function annotations per PEP 3107.
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- Added nonlocal declaration from PEP 3104
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>>> def f(x):
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... def inc():
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... nonlocal x
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... x += 1
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... return x
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... return inc
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...
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>>> inc = f(0)
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>>> inc()
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1
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>>> inc()
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2
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- Moved intern() to sys.intern().
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- exec is now a function.
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- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
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- Classic classes are a thing of the past. All classes are new style.
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- Exceptions *must* derive from BaseException.
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- Integer division always returns a float. The -Q option is no more.
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All the following are gone:
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* PyNumber_Divide and PyNumber_InPlaceDivide
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* __div__, __rdiv__, and __idiv__
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* nb_divide, nb_inplace_divide
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* operator.div, operator.idiv, operator.__div__, operator.__idiv__
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(Only __truediv__ and __floordiv__ remain, not sure how to handle them
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if we want to re-use __div__ and friends. If we do, it will make
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it harder to write code for both 2.x and 3.x.)
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- 'as' and 'with' are keywords.
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- Absolute import is the default behavior for 'import foo' etc.
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- Removed support for syntax:
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backticks (ie, `x`), <>
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|
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- Removed these Python builtins:
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apply(), callable(), coerce(), execfile(), file(), reduce(), reload()
|
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- Removed these Python methods:
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{}.has_key
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- Removed these opcodes:
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BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
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|
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- Remove C API support for restricted execution.
|
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|
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- zip(), map() and filter() now return iterators, behaving like their
|
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itertools counterparts. This also affect map()'s behavior on
|
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sequences of unequal length -- it now stops after the shortest one
|
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is exhausted.
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- Additions:
|
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set literals, set comprehensions, ellipsis literal.
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- Added class decorators per PEP 3129.
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Extension Modules
|
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-----------------
|
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|
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- Remove the imageop module. Obsolete long with its unit tests becoming
|
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useless from the removal of rgbimg and imgfile.
|
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- Removed these attributes from Python modules:
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* operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
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* sys module: exc_clear(), exc_type, exc_value, exc_traceback
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Library
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-------
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- Remove the compiler package. Use of the _ast module and (an eventual)
|
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AST -> bytecode mechanism.
|
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- Removed these modules:
|
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* audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
|
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md5, MimeWriter, mimify, popen2,
|
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rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.
|
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|
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- Moved these modules to Tools/Demos:
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* toaiff
|
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|
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- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
|
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ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
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panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
|
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|
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- Remove obsolete functions:
|
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* commands.getstatus(), os.popen*,
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|
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- Remove functions in the string module that are also string methods;
|
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Remove string.{letters, lowercase, uppercase}.
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- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
|
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|
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- Remove xmlrpclib.SlowParser. It was based on xmllib.
|
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|
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- Patch #1680961: atexit has been reimplemented in C.
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- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
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Build
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-----
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C API
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-----
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- Removed these Python slots:
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__coerce__, __div__, __idiv__, __rdiv__
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- Removed these C APIs:
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PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set
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- Removed these C slots/fields:
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nb_divide, nb_inplace_divide
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- Removed these macros:
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staticforward, statichere, PyArg_GetInt, PyArg_NoArgs, _PyObject_Del
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- Removed these typedefs:
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intargfunc, intintargfunc, intobjargproc, intintobjargproc,
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getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
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memberlist
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Tests
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-----
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- Removed test.testall as test.regrtest replaces it.
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Documentation
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-------------
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Mac
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---
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- The cfmfile was removed.
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Platforms
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---------
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- Support for BeOS and AtheOS was removed (according to PEP 11).
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- Support for RiscOS, Irix, Tru64 was removed (alledgedly).
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Tools/Demos
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-----------
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**(For information about older versions, consult the HISTORY file.)**
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