mirror of https://github.com/python/cpython
200 lines
7.2 KiB
Plaintext
200 lines
7.2 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 3.1 alpha 0
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================================
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*Release date: XX-XXX-200X*
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Core and Builtins
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-----------------
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- Issue #4747: When the terminal does not use utf-8, executing a script with
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non-ascii characters in its name could fail with a "SyntaxError: None" error.
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- Issue #4797: IOError.filename was not set when _fileio.FileIO failed to open
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file with `bytes' filename on Windows.
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- Issue #3680: Reference cycles created through a dict, set or deque iterator
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did not get collected.
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- Issue #4701: PyObject_Hash now implicitly calls PyType_Ready on types
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where the tp_hash and tp_dict slots are both NULL.
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- Issue #4759: None is now allowed as the first argument of
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bytearray.translate(). It was always allowed for bytes.translate().
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- Added test case to ensure attempts to read from a file opened for writing
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fail.
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- Issue #3106: Speedup some comparisons (str/str and int/int).
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- Issue #2183: Simplify and optimize bytecode for list, dict and set
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comprehensions. Original patch for list comprehensions by Neal Norwitz.
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- Issue #2467: gc.DEBUG_STATS reported invalid elapsed times. Also, always
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print elapsed times, not only when some objects are uncollectable /
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unreachable. Original patch by Neil Schemenauer.
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- Issue #3439: Add a bit_length method to int.
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- Issue #2173: When getting device encoding, check that return value of
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nl_langinfo is not the empty string. This was causing silent build
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failures on OS X.
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- Issue #4597: Fixed several opcodes that weren't always propagating
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exceptions.
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- Issue #4589: Fixed exception handling when the __exit__ function of a
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context manager returns a value that cannot be converted to a bool.
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- Issue #4445: Replace "sizeof(PyBytesObject)" with
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"offsetof(PyBytesObject, ob_sval) + 1" when allocating memory for
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bytes instances. On a typical machine this saves 3 bytes of memory
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(on average) per allocation of a bytes instance.
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- Issue #4533: File read operation was dreadfully slow due to a slowly
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growing read buffer. Fixed by using the same growth rate algorithm as
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Python 2.x.
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- Issue #4509: Various issues surrounding resize of bytearray objects to
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which there are buffer exports (e.g. memoryview instances).
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- Issue #4233: Changed semantic of ``_fileio.FileIO``'s ``close()``
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method on file objects with closefd=False. The file descriptor is still
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kept open but the file object behaves like a closed file. The ``FileIO``
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object also got a new readonly attribute ``closefd``.
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- Issue #4569: Interpreter crash when mutating a memoryview with an item size
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larger than 1.
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- Issue #4748: Lambda generators no longer return a value.
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Library
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-------
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- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
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no MSVC compiler is found under Windows. Original patch by Philip Jenvey.
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- Issue #4646: distutils was choking on empty options arg in the setup
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function. Original patch by Thomas Heller.
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- Issue #3767: Convert Tk object to string in tkColorChooser.
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- Issue #3248: Allow placing ScrolledText in a PanedWindow.
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- Issue #4444: Allow assertRaises() to be used as a context handler, so that
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the code under test can be written inline if more practical.
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- Issue #4739: Add pydoc help topics for symbols, so that e.g. help('@')
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works as expected in the interactive environment.
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- Issue #4756: zipfile.is_zipfile() now supports file-like objects. Patch by
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Gabriel Genellina.
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- Issue #4574: reading an UTF16-encoded text file crashes if \r on 64-char
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boundary.
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- Issue #4223: inspect.getsource() will now correctly display source code
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for packages loaded via zipimport (or any other conformant PEP 302
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loader). Original patch by Alexander Belopolsky.
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- Issue #4201: pdb can now access and display source code loaded via
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zipimport (or any other conformant PEP 302 loader). Original patch by
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Alexander Belopolsky.
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- Issue #4197: doctests in modules loaded via zipimport (or any other PEP
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302 conformant loader) will now work correctly in most cases (they
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are still subject to the constraints that exist for all code running
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from inside a module loaded via a PEP 302 loader and attempting to
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perform IO operations based on __file__). Original patch by
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Alexander Belopolsky.
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- Issues #4082 and #4512: Add runpy support to zipimport in a manner that
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allows backporting to maintenance branches. Original patch by
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Alexander Belopolsky.
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- Issue #4163: textwrap module: allow word splitting on a hyphen preceded by
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a non-ASCII letter.
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- Issue #4616: TarFile.utime(): Restore directory times on Windows.
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- Issue #4021: tokenize.detect_encoding() now raises a SyntaxError when the
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codec cannot be found. This is for compatibility with the builtin behavior.
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- Issue #4084: Fix max, min, max_mag and min_mag Decimal methods to
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give correct results in the case where one argument is a quiet NaN
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and the other is a finite number that requires rounding.
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- Issue #4483: _dbm module now builds on systems with gdbm & gdbm_compat
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libs.
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- Added the subprocess.check_call_output() convenience function to get output
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from a subprocess on success or raise an exception on error.
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- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
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support unusual filenames (such as those containing semi-colons) in
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Content-Disposition headers.
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- Issue #4384: Added logging integration with warnings module using
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captureWarnings(). This change includes a NullHandler which does nothing;
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it will be of use to library developers who want to avoid the "No handlers
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could be found for logger XXX" message which can appear if the library user
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doesn't configure logging.
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- Issue #3741: DISTUTILS_USE_SDK set causes msvc9compiler.py to raise an
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exception.
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- Issue #4529: fix the parser module's validation of try-except-finally
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statements.
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- Issue #4458: getopt.gnu_getopt() now recognizes a single "-" as an argument,
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not a malformed option.
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- Added the subprocess.check_output() convenience function to get output
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from a subprocess on success or raise an exception on error.
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- Issue #4542: On Windows, binascii.crc32 still accepted str as binary input;
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the corresponding tests now pass.
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- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
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it was calling the wrong open() function.
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- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
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support unusual filenames (such as those containing semi-colons) in
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Content-Disposition headers.
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Tools/Demos
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-----------
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- Issue #4677: add two list comprehension tests to pybench.
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Extension Modules
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-----------------
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- Issue #4738: Each zlib object now has a separate lock, allowing to compress
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or decompress several streams at once on multi-CPU systems. Also, the GIL
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is now released when computing the CRC of a large buffer. Patch by ebfe.
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- Issue #1040026: Fix os.times result on systems where HZ is incorrect.
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- Issues #3167, #3682: Fix test_math failures for log, log10 on Solaris,
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OpenBSD.
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- Issue #4583: array.array would not always prohibit resizing when a buffer
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has been exported, resulting in an interpreter crash when accessing the
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buffer.
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Build
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-----
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Docs
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----
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**(For information about older versions, consult the HISTORY file.)**
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