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@@ -210,4 +210,4420 @@ Tools/Demos - Issue #15378: Fix Tools/unicode/comparecodecs.py. Patch by Serhiy Storchaka. +What's New in Python 3.3.0? +=========================== + +*Release date: 29-Sep-2012* + +Core and Builtins +----------------- + +- Issue #16046: Fix loading sourceless legacy .pyo files. + +- Issue #16060: Fix refcounting bug when `__trunc__()` returns an object whose + `__int__()` gives a non-integer. Patch by Serhiy Storchaka. + +Extension Modules +----------------- + +- Issue #16012: Fix a regression in pyexpat. The parser's `UseForeignDTD()` + method doesn't require an argument again. + + +What's New in Python 3.3.0 Release Candidate 3? +=============================================== + +*Release date: 23-Sep-2012* + +Core and Builtins +----------------- + +- Issue #15900: Fix reference leak in `PyUnicode_TranslateCharmap()`. + +- Issue #15926: Fix crash after multiple reinitializations of the interpreter. + +- Issue #15895: Fix FILE pointer leak in one error branch of + `PyRun_SimpleFileExFlags()` when filename points to a pyc/pyo file, closeit is + false an and set_main_loader() fails. + +- Fixes for a few crash and memory leak regressions found by Coverity. + +Library +------- + +- Issue #15882: Change `_decimal` to accept any coefficient tuple when + constructing infinities. This is done for backwards compatibility with + decimal.py: Infinity coefficients are undefined in _decimal (in accordance + with the specification). + +- Issue #15925: Fix a regression in `email.util` where the `parsedate()` and + `parsedate_tz()` functions did not return None anymore when the argument could + not be parsed. + +Extension Modules +----------------- + +- Issue #15973: Fix a segmentation fault when comparing datetime timezone + objects. + +- Issue #15977: Fix memory leak in Modules/_ssl.c when the function + _set_npn_protocols() is called multiple times, thanks to Daniel Sommermann. + +- Issue #15969: `faulthandler` module: rename dump_tracebacks_later() to + dump_traceback_later() and cancel_dump_tracebacks_later() to + cancel_dump_traceback_later(). + +- _decimal module: use only C 89 style comments. + + +What's New in Python 3.3.0 Release Candidate 2? +=============================================== + +*Release date: 09-Sep-2012* + +Core and Builtins +----------------- + +- Issue #13992: The trashcan mechanism is now thread-safe. This eliminates + sporadic crashes in multi-thread programs when several long deallocator chains + ran concurrently and involved subclasses of built-in container types. + +- Issue #15784: Modify `OSError`.__str__() to better distinguish between errno + error numbers and Windows error numbers. + +- Issue #15781: Fix two small race conditions in import's module locking. + +Library +------- + +- Issue #15847: Fix a regression in argparse, which did not accept tuples as + argument lists anymore. + +- Issue #15828: Restore support for C extensions in `imp.load_module()`. + +- Issue #15340: Fix importing the random module when ``/dev/urandom`` cannot be + opened. This was a regression caused by the hash randomization patch. + +- Issue #10650: Deprecate the watchexp parameter of the `Decimal.quantize()` + method. + +- Issue #15785: Modify `window.get_wch()` API of the curses module: return a + character for most keys, and an integer for special keys, instead of always + returning an integer. So it is now possible to distinguish special keys like + keypad keys. + +- Issue #14223: Fix `window.addch()` of the curses module for special characters + like curses.ACS_HLINE: the Python function addch(int) and addch(bytes) is now + calling the C function waddch()/mvwaddch() (as it was done in Python 3.2), + instead of wadd_wch()/mvwadd_wch(). The Python function addch(str) is still + calling the C function wadd_wch()/mvwadd_wch() if the Python curses is linked + to libncursesw. + +Build +----- + +- Issue #15822: Really ensure 2to3 grammar pickles are properly installed + (replaces fixes for Issue #15645). + +Documentation +------------- + +- Issue #15814: The memoryview enhancements in 3.3.0 accidentally permitted the + hashing of multi-dimensional memorviews and memoryviews with multi-byte item + formats. The intended restrictions have now been documented - they will be + correctly enforced in 3.3.1. + + +What's New in Python 3.3.0 Release Candidate 1? +=============================================== + +*Release date: 25-Aug-2012* + +Core and Builtins +----------------- + +- Issue #15573: memoryview comparisons are now performed by value with full + support for any valid struct module format definition. + +- Issue #15316: When an item in the fromlist for `__import__()` doesn't exist, + don't raise an error, but if an exception is raised as part of an import do + let that propagate. + +- Issue #15778: Ensure that ``str(ImportError(msg))`` returns a str even when + msg isn't a str. + +- Issue #2051: Source file permission bits are once again correctly copied to + the cached bytecode file. (The migration to importlib reintroduced this + problem because these was no regression test. A test has been added as part of + this patch) + +- Issue #15761: Fix crash when ``PYTHONEXECUTABLE`` is set on Mac OS X. + +- Issue #15726: Fix incorrect bounds checking in PyState_FindModule. Patch by + Robin Schreiber. + +- Issue #15604: Update uses of `PyObject_IsTrue()` to check for and handle + errors correctly. Patch by Serhiy Storchaka. + +- Issue #14846: `importlib.FileFinder` now handles the case where the directory + being searched is removed after a previous import attempt. + +Library +------- + +- Issue #13370: Ensure that ctypes works on Mac OS X when Python is compiled + using the clang compiler. + +- Issue #13072: The array module's 'u' format code is now deprecated and will be + removed in Python 4.0. + +- Issue #15544: Fix Decimal.__float__ to work with payload-carrying NaNs. + +- Issue #15776: Allow pyvenv to work in existing directory with --clean. + +- Issue #15249: email's BytesGenerator now correctly mangles From lines (when + requested) even if the body contains undecodable bytes. + +- Issue #15777: Fix a refleak in _posixsubprocess. + +- Issue ##665194: Update `email.utils.localtime` to use datetime.astimezone and + correctly handle historic changes in UTC offsets. + +- Issue #15199: Fix JavaScript's default MIME type to application/javascript. + Patch by Bohuslav Kabrda. + +- Issue #12643: `code.InteractiveConsole` now respects `sys.excepthook` when + displaying exceptions. Patch by Aaron Iles. + +- Issue #13579: `string.Formatter` now understands the 'a' conversion specifier. + +- Issue #15595: Fix ``subprocess.Popen(universal_newlines=True)`` for certain + locales (utf-16 and utf-32 family). Patch by Chris Jerdonek. + +- Issue #15477: In cmath and math modules, add workaround for platforms whose + system-supplied log1p function doesn't respect signs of zeros. + +- Issue #15715: `importlib.__import__()` will silence an ImportError when the + use of fromlist leads to a failed import. + +- Issue #14669: Fix pickling of connections and sockets on Mac OS X by + sending/receiving an acknowledgment after file descriptor transfer. + TestPicklingConnection has been reenabled for Mac OS X. + +- Issue #11062: Fix adding a message from file to Babyl mailbox. + +- Issue #15646: Prevent equivalent of a fork bomb when using `multiprocessing` + on Windows without the ``if __name__ == '__main__'`` idiom. + +- Issue #15678: Fix IDLE menus when started from OS X command line (3.3.0b2 + regression). + +C API +----- + +Extension Modules +----------------- + +Tools/Demos +----------- + +Documentation +------------- + +- Issue #14674: Add a discussion of the `json` module's standard compliance. + Patch by Chris Rebert. + +- Create a 'Concurrent Execution' section in the docs, and split up the + 'Optional Operating System Services' section to use a more user-centric + classification scheme (splitting them across the new CE section, IPC and text + processing). Operating system limitatons can be reflected with the Sphinx + ``:platform:`` tag, it doesn't make sense as part of the Table of Contents. + +- Issue #4966: Bring the sequence docs up to date for the Py3k transition and + the many language enhancements since they were original written. + +- The "path importer" misnomer has been replaced with Eric Snow's + more-awkward-but-at-least-not-wrong suggestion of "path based finder" in the + import system reference docs. + +- Issue #15640: Document `importlib.abc.Finder` as deprecated. + +- Issue #15630: Add an example for "continue" stmt in the tutorial. Patch by + Daniel Ellis. + +Tests +----- + +- Issue #15747: ZFS always returns EOPNOTSUPP when attempting to set the + UF_IMMUTABLE flag (via either chflags or lchflags); refactor affected tests in + test_posix.py to account for this. + +- Issue #15285: Refactor the approach for testing connect timeouts using two + external hosts that have been configured specifically for this type of test. + +- Issue #15743: Remove the deprecated method usage in `urllib` tests. Patch by + Jeff Knupp. + +- Issue #15615: Add some tests for the `json` module's handling of invalid input + data. Patch by Kushal Das. + +Build +----- + +- Output lib files for PGO build into PGO directory. + +- Pick up 32-bit launcher from PGO directory on 64-bit PGO build. + +- Drop ``PC\python_nt.h`` as it's not used. Add input dependency on custom + build step. + +- Issue #15511: Drop explicit dependency on pythonxy.lib from _decimal amd64 + configuration. + +- Add missing PGI/PGO configurations for pywlauncher. + +- Issue #15645: Ensure 2to3 grammar pickles are properly installed. + + +What's New in Python 3.3.0 Beta 2? +================================== + +*Release date: 12-Aug-2012* + +Core and Builtins +----------------- + +- Issue #15568: Fix the return value of ``yield from`` when StopIteration is + raised by a custom iterator. + +- Issue #13119: `sys.stdout` and `sys.stderr` are now using "\r\n" newline on + Windows, as Python 2. + +- Issue #15534: Fix the fast-search function for non-ASCII Unicode strings. + +- Issue #15508: Fix the docstring for `__import__()` to have the proper default + value of 0 for 'level' and to not mention negative levels since they are not + supported. + +- Issue #15425: Eliminated traceback noise from more situations involving + importlib. + +- Issue #14578: Support modules registered in the Windows registry again. + +- Issue #15466: Stop using TYPE_INT64 in marshal, to make importlib.h (and other + byte code files) equal between 32-bit and 64-bit systems. + +- Issue #1692335: Move initial exception args assignment to + `BaseException.__new__()` to help pickling of naive subclasses. + +- Issue #12834: Fix `PyBuffer_ToContiguous()` for non-contiguous arrays. + +- Issue #15456: Fix code `__sizeof__()` after #12399 change. Patch by Serhiy + Storchaka. + +- Issue #15404: Refleak in PyMethodObject repr. + +- Issue #15394: An issue in `PyModule_Create()` that caused references to be + leaked on some error paths has been fixed. Patch by Julia Lawall. + +- Issue #15368: An issue that caused bytecode generation to be non-deterministic + has been fixed. + +- Issue #15202: Consistently use the name "follow_symlinks" for new parameters + in os and shutil functions. + +- Issue #15314: ``__main__.__loader__`` is now set correctly during interpreter + startup. + +- Issue #15111: When a module imported using 'from import' has an ImportError + inside itself, don't mask that fact behind a generic ImportError for the + module itself. + +- Issue #15293: Add GC support to the AST base node type. + +- Issue #15291: Fix a memory leak where AST nodes where not properly + deallocated. + +- Issue #15110: Fix the tracebacks generated by "import xxx" to not show the + importlib stack frames. + +- Issue #15020: The program name used to search for Python's path is now + "python3" under Unix, not "python". + +- Issue #15897: zipimport.c doesn't check return value of fseek(). + Patch by Felipe Cruz. + +- Issue #15033: Fix the exit status bug when modules invoked using -m swith, + return the proper failure return value (1). Patch contributed by Jeff Knupp. + +- Issue #15229: An `OSError` subclass whose __init__ doesn't call back + OSError.__init__ could produce incomplete instances, leading to crashes when + calling str() on them. + +- Issue 15307: Virtual environments now use symlinks with framework builds on + Mac OS X, like other POSIX builds. + +Library +------- + +- Issue #15424: Add a `__sizeof__()` implementation for array objects. Patch by + Ludwig Hähne. + +- Issue #15576: Allow extension modules to act as a package's __init__ module. + +- Issue #15502: Have `importlib.invalidate_caches()` work on `sys.meta_path` + instead of `sys.path_importer_cache`. + +- Issue #15163: Pydoc shouldn't list __loader__ as module data. + +- Issue #15471: Do not use mutable objects as defaults for + `importlib.__import__()`. + +- Issue #15559: To avoid a problematic failure mode when passed to the bytes + constructor, objects in the ipaddress module no longer implement `__index__()` + (they still implement `__int__()` as appropriate). + +- Issue #15546: Fix handling of pathological input data in the peek() and + read1() methods of the BZ2File, GzipFile and LZMAFile classes. + +- Issue #13052: Fix IDLE crashing when replace string in Search/Replace dialog + ended with ``\``. Patch by Roger Serwy. + +- Issue #12655: Instead of requiring a custom type, `os.sched_getaffinity()` and + `os.sched_setaffinity()` now use regular sets of integers to represent the + CPUs a process is restricted to. + +- Issue #15538: Fix compilation of the `socket.getnameinfo()` / + `socket.getaddrinfo()` emulation code. Patch by Philipp Hagemeister. + +- Issue #15519: Properly expose WindowsRegistryFinder in importlib (and use the + correct term for it). Original patch by Eric Snow. + +- Issue #15502: Bring the importlib ABCs into line with the current state of the + import protocols given PEP 420. Original patch by Eric Snow. + +- Issue #15499: Launching a webbrowser in Unix used to sleep for a few seconds. + Original patch by Anton Barkovsky. + +- Issue #15463: The faulthandler module truncates strings to 500 characters, + instead of 100, to be able to display long file paths. + +- Issue #6056: Make `multiprocessing` use setblocking(True) on the sockets it + uses. Original patch by J Derek Wilson. + +- Issue #15364: Fix sysconfig.get_config_var('srcdir') to be an absolute path. + +- Issue #15041: Update "see also" list in tkinter documentation. + +- Issue #15413: `os.times()` had disappeared under Windows. + +- Issue #15402: An issue in the struct module that caused `sys.getsizeof()` to + return incorrect results for struct.Struct instances has been fixed. Initial + patch by Serhiy Storchaka. + +- Issue #15232: When mangle_from is True, `email.Generator` now correctly + mangles lines that start with 'From ' that occur in a MIME preamble or + epilogue. + +- Issue #15094: Incorrectly placed #endif in _tkinter.c. Patch by Serhiy + Storchaka. + +- Issue #13922: `argparse` no longer incorrectly strips '--'s that appear after + the first one. + +- Issue #12353: `argparse` now correctly handles null argument values. + +- Issue #10017, issue #14998: Fix TypeError using pprint on dictionaries with + user-defined types as keys or other unorderable keys. + +- Issue #15397: `inspect.getmodulename()` is now based directly on importlib via + a new `importlib.machinery.all_suffixes()` API. + +- Issue #14635: `telnetlib` will use poll() rather than select() when possible to + avoid failing due to the select() file descriptor limit. + +- Issue #15180: Clarify posixpath.join() error message when mixing str & bytes. + +- Issue #15343: pkgutil now includes an iter_importer_modules implementation for + importlib.machinery.FileFinder (similar to the way it already handled + zipimport.zipimporter). + +- Issue #15314: runpy now sets __main__.__loader__ correctly. + +- Issue #15357: The import emulation in pkgutil is now deprecated. pkgutil uses + importlib internally rather than the emulation. + +- Issue #15233: Python now guarantees that callables registered with the atexit + module will be called in a deterministic order. + +- Issue #15238: `shutil.copystat()` now copies Linux "extended attributes". + +- Issue #15230: runpy.run_path now correctly sets __package__ as described in + the documentation. + +- Issue #15315: Support VS 2010 in distutils cygwincompiler. + +- Issue #15294: Fix a regression in pkgutil.extend_path()'s handling of nested + namespace packages. + +- Issue #15056: `imp.cache_from_source()` and `imp.source_from_cache()` raise + NotImplementedError when `sys.implementation.cache_tag` is set to None. + +- Issue #15256: Grammatical mistake in exception raised by `imp.find_module()`. + +- Issue #5931: `wsgiref` environ variable SERVER_SOFTWARE will specify an + implementation specific term like CPython, Jython instead of generic "Python". + +- Issue #13248: Remove obsolete argument "max_buffer_size" of BufferedWriter and + BufferedRWPair, from the io module. + +- Issue #13248: Remove obsolete argument "version" of `argparse.ArgumentParser`. + +- Issue #14814: Implement more consistent ordering and sorting behaviour for + ipaddress objects. + +- Issue #14814: `ipaddress` network objects correctly return NotImplemented when + compared to arbitrary objects instead of raising TypeError. + +- Issue #14990: Correctly fail with SyntaxError on invalid encoding declaration. + +- Issue #14814: `ipaddress` now provides more informative error messages when + constructing instances directly (changes permitted during beta due to + provisional API status). + +- Issue #15247: `io.FileIO` now raises an error when given a file descriptor + pointing to a directory. + +- Issue #15261: Stop os.stat(fd) crashing on Windows when fd not open. + +- Issue #15166: Implement `imp.get_tag()` using `sys.implementation.cache_tag`. + +- Issue #15210: Catch KeyError when `importlib.__init__()` can't find + _frozen_importlib in sys.modules, not ImportError. + +- Issue #15030: `importlib.abc.PyPycLoader` now supports the new source size + header field in .pyc files. + +- Issue #5346: Preserve permissions of mbox, MMDF and Babyl mailbox files on + flush(). + +- Issue #10571: Fix the "--sign" option of distutils' upload command. Patch by + Jakub Wilk. + +- Issue #9559: If messages were only added, a new file is no longer created and + renamed over the old file when flush() is called on an mbox, MMDF or Babyl + mailbox. + +- Issue 10924: Fixed `crypt.mksalt()` to use a RNG that is suitable for + cryptographic purpose. + +- Issue #15184: Ensure consistent results of OS X configuration tailoring for + universal builds by factoring out common OS X-specific customizations from + sysconfig, distutils.sysconfig, distutils.util, and distutils.unixccompiler + into a new module _osx_support. + +C API +----- + +- Issue #15610: `PyImport_ImportModuleEx()` now uses a 'level' of 0 instead of -1. + +- Issue #15169, issue #14599: Strip out the C implementation of + `imp.source_from_cache()` used by PyImport_ExecCodeModuleWithPathnames() and + used the Python code instead. Leads to PyImport_ExecCodeModuleObject() to not + try to infer the source path from the bytecode path as + PyImport_ExecCodeModuleWithPathnames() does. + +Extension Modules +----------------- + +- Issue #6493: An issue in ctypes on Windows that caused structure bitfields of + type `ctypes.c_uint32` and width 32 to incorrectly be set has been fixed. + +- Issue #15194: Update libffi to the 3.0.11 release. + +Tools/Demos +----------- + +- Issue #15458: python-config gets a new option --configdir to print the $LIBPL + value. + +- Move importlib.test.benchmark to Tools/importbench. + +- Issue #12605: The gdb hooks for debugging CPython (within Tools/gdb) have been + enhanced to show information on more C frames relevant to CPython within the + "py-bt" and "py-bt-full" commands: + + * C frames that are waiting on the GIL + * C frames that are garbage-collecting + * C frames that are due to the invocation of a PyCFunction + +Documentation +------------- + +- Issue #15444: Use proper spelling for non-ASCII contributor names. Patch by + Serhiy Storchaka. + +- Issue #15295: Reorganize and rewrite the documentation on the import system. + +- Issue #15230: Clearly document some of the limitations of the runpy module and + nudge readers towards importlib when appropriate. + +- Issue #15053: Copy Python 3.3 import lock change notice to all relevant + functions in imp instead of just at the top of the relevant section. + +- Issue #15288: Link to the term "loader" in notes in pkgutil about how things + won't work as expected in Python 3.3 and mark the requisite functions as + "changed" since they will no longer work with modules directly imported by + import itself. + +- Issue #13557: Clarify effect of giving two different namespaces to `exec()` or + `execfile()`. + +- Issue #15250: Document that `filecmp.dircmp()` compares files shallowly. Patch + contributed by Chris Jerdonek. + +Tests +----- + +- Issue #15467: Move helpers for `__sizeof__()` tests into test_support. Patch + by Serhiy Storchaka. + +- Issue #15320: Make iterating the list of tests thread-safe when running tests + in multiprocess mode. Patch by Chris Jerdonek. + +- Issue #15168: Move `importlib.test` to `test.test_importlib`. + +- Issue #15091: Reactivate a test on UNIX which was failing thanks to a + forgotten `importlib.invalidate_caches()` call. + +- Issue #15230: Adopted a more systematic approach in the runpy tests. + +- Issue #15300: Ensure the temporary test working directories are in the same + parent folder when running tests in multiprocess mode from a Python build. + Patch by Chris Jerdonek. + +- Issue #15284: Skip {send,recv}msg tests in test_socket when IPv6 is not + enabled. Patch by Brian Brazil. + +- Issue #15277: Fix a resource leak in support.py when IPv6 is disabled. Patch + by Brian Brazil. + +Build +----- + +- Issue #11715: Fix multiarch detection without having Debian development tools + (dpkg-dev) installed. + +- Issue #15037: Build OS X installers with local copy of ncurses 5.9 libraries + to avoid curses.unget_wch bug present in older versions of ncurses such as + those shipped with OS X. + +- Issue #15560: Fix building _sqlite3 extension on OS X with an SDK. Also, for + OS X installers, ensure consistent sqlite3 behavior and feature availability + by building a local copy of libsqlite3 rather than depending on the wide range + of versions supplied with various OS X releases. + +- Issue #8847: Disable COMDAT folding in Windows PGO builds. + +- Issue #14018: Fix OS X Tcl/Tk framework checking when using OS X SDKs. + +- Issue #15431: Add _freeze_importlib project to regenerate importlib.h on + Windows. Patch by Kristján Valur Jónsson. + +- Issue #14197: For OS X framework builds, ensure links to the shared library + are created with the proper ABI suffix. + +- Issue #14330: For cross builds, don't use host python, use host search paths + for host compiler. + +- Issue #15235: Allow Berkley DB versions up to 5.3 to build the dbm module. + +- Issue #15268: Search curses.h in /usr/include/ncursesw. + + +What's New in Python 3.3.0 Beta 1? +================================== + +*Release date: 27-Jun-2012* + +Core and Builtins +----------------- + +- Fix a (most likely) very rare memory leak when calling main() and not being + able to decode a command-line argument. + +- Issue #14815: Use Py_ssize_t instead of long for the object hash, to + preserve all 64 bits of hash on Win64. + +- Issue #12268: File readline, readlines and read() or readall() methods + no longer lose data when an underlying read system call is interrupted. + IOError is no longer raised due to a read system call returning EINTR + from within these methods. + +- Issue #11626: Add _SizeT functions to stable ABI. + +- Issue #15146: Add PyType_FromSpecWithBases. Patch by Robin Schreiber. + +- Issue #15142: Fix reference leak when deallocating instances of types + created using PyType_FromSpec(). + +- Issue #15042: Add PyState_AddModule and PyState_RemoveModule. Add version + guard for Py_LIMITED_API additions. Patch by Robin Schreiber. + +- Issue #10053: Don't close FDs when FileIO.__init__ fails. Loosely based on + the work by Hirokazu Yamamoto. + +- Issue #15096: Removed support for ur'' as the raw notation isn't + compatible with Python 2.x's raw unicode strings. + +- Issue #13783: Generator objects now use the identifier APIs internally + +- Issue #14874: Restore charmap decoding speed to pre-PEP 393 levels. + Patch by Serhiy Storchaka. + +- Issue #15026: utf-16 encoding is now significantly faster (up to 10x). + Patch by Serhiy Storchaka. + +- Issue #11022: open() and io.TextIOWrapper are now calling + locale.getpreferredencoding(False) instead of locale.getpreferredencoding() + in text mode if the encoding is not specified. Don't change temporary the + locale encoding using locale.setlocale(), use the current locale encoding + instead of the user preferred encoding. + +- Issue #14673: Add Eric Snow's sys.implementation implementation. + +- Issue #15038: Optimize python Locks on Windows. + +Library +------- + +- Issue #9803: Don't close IDLE on saving if breakpoint is open. + Patch by Roger Serwy. + +- Issue #12288: Consider '0' and '0.0' as valid initialvalue + for tkinter SimpleDialog. + +- Issue #15512: Add a __sizeof__ implementation for parser. + Patch by Serhiy Storchaka. + +- Issue #15469: Add a __sizeof__ implementation for deque objects. + Patch by Serhiy Storchaka. + +- Issue #15489: Add a __sizeof__ implementation for BytesIO objects. + Patch by Serhiy Storchaka. + +- Issue #15487: Add a __sizeof__ implementation for buffered I/O objects. + Patch by Serhiy Storchaka. + +- Issue #15514: Correct __sizeof__ support for cpu_set. + Patch by Serhiy Storchaka. + +- Issue #15187: Bugfix: remove temporary directories test_shutil was leaving + behind. + +- Issue #15177: Added dir_fd parameter to os.fwalk(). + +- Issue #15176: Clarified behavior, documentation, and implementation + of os.listdir(). + +- Issue #15061: Re-implemented hmac.compare_digest() in C to prevent further + timing analysis and to support all buffer protocol aware objects as well as + ASCII only str instances safely. + +- Issue #15164: Change return value of platform.uname() from a + plain tuple to a collections.namedtuple. + +- Support Mageia Linux in the platform module. + +- Issue #11678: Support Arch linux in the platform module. + +- Issue #15118: Change return value of os.uname() and os.times() from + plain tuples to immutable iterable objects with named attributes + (structseq objects). + +- Speed up _decimal by another 10-15% by caching the thread local context + that was last accessed. In the pi benchmark (64-bit platform, prec=9), + _decimal is now only 1.5x slower than float. + +- Remove the packaging module, which is not ready for prime time. + +- Issue #15154: Add "dir_fd" parameter to os.rmdir, remove "rmdir" + parameter from os.remove / os.unlink. + +- Issue #4489: Add a shutil.rmtree that isn't susceptible to symlink attacks. + It is used automatically on platforms supporting the necessary os.openat() + and os.unlinkat() functions. Main code by Martin von Löwis. + +- Issue #15156: HTMLParser now uses the new "html.entities.html5" dictionary. + +- Issue #11113: add a new "html5" dictionary containing the named character + references defined by the HTML5 standard and the equivalent Unicode + character(s) to the html.entities module. + +- Issue #15114: the strict mode of HTMLParser and the HTMLParseError exception + are deprecated now that the parser is able to parse invalid markup. + +- Issue #3665: \u and \U escapes are now supported in unicode regular + expressions. Patch by Serhiy Storchaka. + +- Issue #15153: Added inspect.getgeneratorlocals to simplify white box + testing of generator state updates + +- Issue #13062: Added inspect.getclosurevars to simplify testing stateful + closures + +- Issue #11024: Fixes and additional tests for Time2Internaldate. + +- Issue #14626: Large refactoring of functions / parameters in the os module. + Many functions now support "dir_fd" and "follow_symlinks" parameters; + some also support accepting an open file descriptor in place of of a path + string. Added os.support_* collections as LBYL helpers. Removed many + functions only previously seen in 3.3 alpha releases (often starting with + "f" or "l", or ending with "at"). Originally suggested by Serhiy Storchaka; + implemented by Larry Hastings. + +- Issue #15008: Implement PEP 362 "Signature Objects". + Patch by Yury Selivanov. + +- Issue: #15138: base64.urlsafe_{en,de}code() are now 3-4x faster. + +- Issue #444582: Add shutil.which, for finding programs on the system path. + Original patch by Erik Demaine, with later iterations by Jan Killian + and Brian Curtin. + +- Issue #14837: SSL errors now have ``library`` and ``reason`` attributes + describing precisely what happened and in which OpenSSL submodule. The + str() of a SSLError is also enhanced accordingly. + +- Issue #9527: datetime.astimezone() method will now supply a class + timezone instance corresponding to the system local timezone when + called with no arguments. + +- Issue #14653: email.utils.mktime_tz() no longer relies on system + mktime() when timezone offest is supplied. + +- Issue #14684: zlib.compressobj() and zlib.decompressobj() now support the use + of predefined compression dictionaries. Original patch by Sam Rushing. + +- Fix GzipFile's handling of filenames given as bytes objects. + +- Issue #14772: Return destination values from some shutil functions. + +- Issue #15064: Implement context manager protocol for multiprocessing types + +- Issue #15101: Make pool finalizer avoid joining current thread. + +- Issue #14657: The frozen instance of importlib used for bootstrap is now + also the module imported as importlib._bootstrap. + +- Issue #14055: Add __sizeof__ support to _elementtree. + +- Issue #15054: A bug in tokenize.tokenize that caused string literals + with 'b' prefixes to be incorrectly tokenized has been fixed. + Patch by Serhiy Storchaka. + +- Issue #15006: Allow equality comparison between naive and aware + time or datetime objects. + +- Issue #14982: Document that pkgutil's iteration functions require the + non-standard iter_modules() method to be defined by an importer (something + the importlib importers do not define). + +- Issue #15036: Mailbox no longer throws an error if a flush is done + between operations when removing or changing multiple items in mbox, + MMDF, or Babyl mailboxes. + +- Issue #14059: Implement multiprocessing.Barrier. + +- Issue #15061: The inappropriately named hmac.secure_compare has been + renamed to hmac.compare_digest, restricted to operating on bytes inputs + only and had its documentation updated to more accurately reflect both its + intent and its limitations + +- Issue #13841: Make child processes exit using sys.exit() on Windows. + +- Issue #14936: curses_panel was converted to PEP 3121 and PEP 384 API. + Patch by Robin Schreiber. + +- Issue #1667546: On platforms supporting tm_zone and tm_gmtoff fields + in struct tm, time.struct_time objects returned by time.gmtime(), + time.localtime() and time.strptime() functions now have tm_zone and + tm_gmtoff attributes. Original patch by Paul Boddie. + +- Rename adjusted attribute to adjustable in time.get_clock_info() result. + +- Issue #3518: Remove references to non-existent BaseManager.from_address() + method. + +- Issue #13857: Added textwrap.indent() function (initial patch by Ezra + Berch) + +- Issue #2736: Added datetime.timestamp() method. + +- Issue #13854: Make multiprocessing properly handle non-integer + non-string argument to SystemExit. + +- Issue #12157: Make pool.map() empty iterables correctly. Initial + patch by mouad. + +- Issue #11823: disassembly now shows argument counts on calls with keyword args. + +- Issue #14711: os.stat_float_times() has been deprecated. + +- LZMAFile now accepts the modes "rb"/"wb"/"ab" as synonyms of "r"/"w"/"a". + +- The bz2 and lzma modules now each contain an open() function, allowing + compressed files to readily be opened in text mode as well as binary mode. + +- BZ2File.__init__() and LZMAFile.__init__() now accept a file object as their + first argument, rather than requiring a separate "fileobj" argument. + +- gzip.open() now accepts file objects as well as filenames. + +- Issue #14992: os.makedirs(path, exist_ok=True) would raise an OSError + when the path existed and had the S_ISGID mode bit set when it was + not explicitly asked for. This is no longer an exception as mkdir + cannot control if the OS sets that bit for it or not. + +- Issue #14989: Make the CGI enable option to http.server available via command + line. + +- Issue #14987: Add a missing import statement to inspect. + +- Issue #1079: email.header.decode_header now correctly parses all the examples + in RFC2047. There is a necessary visible behavior change: the leading and/or + trailing whitespace on ASCII parts is now preserved. + +- Issue #14969: Better handling of exception chaining in contextlib.ExitStack + +- Issue #14962: Update text coloring in IDLE shell window after changing + options. Patch by Roger Serwy. + +- Issue #14963: Convert contextlib.ExitStack.__exit__ to use an iterative + algorithm (Patch by Alon Horev) + +- Issue #14785: Add sys._debugmallocstats() to help debug low-level memory + allocation issues + +- Issue #14443: Ensure that .py files are byte-compiled with the correct Python + executable within bdist_rpm even on older versions of RPM + +C-API +----- + +- Issue #13783: Inadvertent additions to the public C API in the PEP 380 + implementation have either been removed or marked as private interfaces. + +Extension Modules +----------------- + +- Issue #15000: Support the "unique" x32 architecture in _posixsubprocess.c. + +Documentation +------------- + +- Issue #15081: Document PyState_FindModule. + Patch by Robin Schreiber. + +- Issue #14814: Added first draft of ipaddress module API reference + +Tests +----- + +- Issue #14769: test_capi now has SkipitemTest, which cleverly checks + for "parity" between PyArg_ParseTuple() and the Python/getargs.c static + function skipitem() for all possible "format units". + +- test_nntplib now tolerates being run from behind NNTP gateways that add + "X-Antivirus" headers to articles + +- Issue #15043: test_gdb is now skipped entirely if gdb security settings + block loading of the gdb hooks + +- Issue #14963: Add test cases for exception handling behaviour + in contextlib.ExitStack (Initial patch by Alon Horev) + +Build +----- + +- Issue #13590: Improve support for OS X Xcode 4: + * Try to avoid building Python or extension modules with problematic + llvm-gcc compiler. + * Since Xcode 4 removes ppc support, extension module builds now + check for ppc compiler support and automatically remove ppc and + ppc64 archs when not available. + * Since Xcode 4 no longer install SDKs in default locations, + extension module builds now revert to using installed headers + and libs if the SDK used to build the interpreter is not + available. + * Update ./configure to use better defaults for universal builds; + in particular, --enable-universalsdk=yes uses the Xcode default + SDK and --with-universal-archs now defaults to "intel" if ppc + not available. + +- Issue #14225: Fix Unicode support for curses (#12567) on OS X + +- Issue #14928: Fix importlib bootstrap issues by using a custom executable + (Modules/_freeze_importlib) to build Python/importlib.h. + + +What's New in Python 3.3.0 Alpha 4? +=================================== + +*Release date: 31-May-2012* + +Core and Builtins +----------------- + +- Issue #14835: Make plistlib output empty arrays & dicts like OS X. + Patch by Sidney San Martín. + +- Issue #14744: Use the new _PyUnicodeWriter internal API to speed up + str%args and str.format(args). + +- Issue #14930: Make memoryview objects weakrefable. + +- Issue #14775: Fix a potential quadratic dict build-up due to the garbage + collector repeatedly trying to untrack dicts. + +- Issue #14857: fix regression in references to PEP 3135 implicit __class__ + closure variable (Reopens issue #12370) + +- Issue #14712 (PEP 405): Virtual environments. Implemented by Vinay Sajip. + +- Issue #14660 (PEP 420): Namespace packages. Implemented by Eric Smith. + +- Issue #14494: Fix __future__.py and its documentation to note that + absolute imports are the default behavior in 3.0 instead of 2.7. + Patch by Sven Marnach. + +- Issue #9260: A finer-grained import lock. Most of the import sequence + now uses per-module locks rather than the global import lock, eliminating + well-known issues with threads and imports. + +- Issue #14624: UTF-16 decoding is now 3x to 4x faster on various inputs. + Patch by Serhiy Storchaka. + +- asdl_seq and asdl_int_seq are now Py_ssize_t sized. + +- Issue #14133 (PEP 415): Implement suppression of __context__ display with an + attribute on BaseException. This replaces the original mechanism of PEP 409. + +- Issue #14417: Mutating a dict during lookup now restarts the lookup instead + of raising a RuntimeError (undoes issue #14205). + +- Issue #14738: Speed-up UTF-8 decoding on non-ASCII data. Patch by Serhiy + Storchaka. + +- Issue #14700: Fix two broken and undefined-behaviour-inducing overflow checks + in old-style string formatting. + +- Issue #14705: The PyArg_Parse() family of functions now support the 'p' format + unit, which accepts a "boolean predicate" argument. It converts any Python + value into an integer--0 if it is "false", and 1 otherwise. + +Library +------- + +- Issue #14690: Use monotonic clock instead of system clock in the sched, + subprocess and trace modules. + +- Issue #14958: Change IDLE systax highlighting to recognize all string and + byte literals supported in Python 3.3. + +- Issue #10997: Prevent a duplicate entry in IDLE's "Recent Files" menu. + +- Issue #14443: Tell rpmbuild to use the correct version of Python in + bdist_rpm. Initial patch by Ross Lagerwall. + +- Issue #14929: Stop Idle 3.x from closing on Unicode decode errors when + grepping. Patch by Roger Serwy. + +- Issue #12515: email now registers a defect if it gets to EOF while parsing + a MIME part without seeing the closing MIME boundary. + +- Issue #12510: Attempting to get invalid tooltip no longer closes Idle. + Other tooltipss have been corrected or improved and the number of tests + has been tripled. Original patch by Roger Serwy. + +- Issue #1672568: email now always decodes base64 payloads, adding padding and + ignoring non-base64-alphabet characters if needed, and registering defects + for any such problems. + +- Issue #14925: email now registers a defect when the parser decides that there + is a missing header/body separator line. MalformedHeaderDefect, which the + existing code would never actually generate, is deprecated. + +- Issue #10365: File open dialog now works instead of crashing even when + the parent window is closed before the dialog. Patch by Roger Serwy. + +- Issue #8739: Updated smtpd to support RFC 5321, and added support for the + RFC 1870 SIZE extension. + +- Issue #665194: Added a localtime function to email.utils to provide an + aware local datetime for use in setting Date headers. + +- Issue #12586: Added new provisional policies that implement convenient + unicode support for email headers. See What's New for details. + +- Issue #14731: Refactored email Policy framework to support full backward + compatibility with Python 3.2 by default yet allow for the introduction of + new features through new policies. Note that Policy.must_be_7bit is renamed + to cte_type. + +- Issue #14876: Use user-selected font for highlight configuration. + +- Issue #14920: Fix the help(urllib.parse) failure on locale C on terminals. + Have ascii characters in help. + +- Issue #14548: Make multiprocessing finalizers check pid before + running to cope with possibility of gc running just after fork. + +- Issue #14863: Update the documentation of os.fdopen() to reflect the + fact that it's only a thin wrapper around open() anymore. + +- Issue #14036: Add an additional check to validate that port in urlparse does + not go in illegal range and returns None. + +- Issue #14862: Add missing names to os.__all__ + +- Issue #14875: Use float('inf') instead of float('1e66666') in the json module. + +- Issue #13585: Added contextlib.ExitStack + +- PEP 3144, Issue #14814: Added the ipaddress module + +- Issue #14426: Correct the Date format in Expires attribute of Set-Cookie + Header in Cookie.py. + +- Issue #14588: The types module now provide new_class() and prepare_class() + functions to support PEP 3115 compliant dynamic class creation. Patch by + Daniel Urban and Nick Coghlan. + +- Issue #13152: Allow to specify a custom tabsize for expanding tabs in + textwrap. Patch by John Feuerstein. + +- Issue #14721: Send the correct 'Content-length: 0' header when the body is an + empty string ''. Initial Patch contributed by Arve Knudsen. + +- Issue #14072: Fix parsing of 'tel' URIs in urlparse by making the check for + ports stricter. + +- Issue #9374: Generic parsing of query and fragment portions of url for any + scheme. Supported both by RFC3986 and RFC2396. + +- Issue #14798: Fix the functions in pyclbr to raise an ImportError + when the first part of a dotted name is not a package. Patch by + Xavier de Gaye. + +- Issue #12098: multiprocessing on Windows now starts child processes + using the same sys.flags as the current process. Initial patch by + Sergey Mezentsev. + +- Issue #13031: Small speed-up for tarfile when unzipping tarfiles. + Patch by Justin Peel. + +- Issue #14780: urllib.request.urlopen() now has a ``cadefault`` argument + to use the default certificate store. Initial patch by James Oakley. + +- Issue #14829: Fix bisect and range() indexing with large indices + (>= 2 ** 32) under 64-bit Windows. + +- Issue #14732: The _csv module now uses PEP 3121 module initialization. + Patch by Robin Schreiber. + +- Issue #14809: Add HTTP status codes introduced by RFC 6585 to http.server + and http.client. Patch by EungJun Yi. + +- Issue #14777: tkinter may return undecoded UTF-8 bytes as a string when + accessing the Tk clipboard. Modify clipboad_get() to first request type + UTF8_STRING when no specific type is requested in an X11 windowing + environment, falling back to the current default type STRING if that fails. + Original patch by Thomas Kluyver. + +- Issue #14773: Fix os.fwalk() failing on dangling symlinks. + +- Issue #12541: Be lenient with quotes around Realm field of HTTP Basic + Authentation in urllib2. + +- Issue #14807: move undocumented tarfile.filemode() to stat.filemode() and add + doc entry. Add tarfile.filemode alias with deprecation warning. + +- Issue #13815: TarFile.extractfile() now returns io.BufferedReader objects. + +- Issue #14532: Add a secure_compare() helper to the hmac module, to mitigate + timing attacks. Patch by Jon Oberheide. + +- Add importlib.util.resolve_name(). + +- Issue #14366: Support lzma compression in zip files. + Patch by Serhiy Storchaka. + +- Issue #13959: Introduce importlib.find_loader() and document + imp.find_module/load_module as deprecated. + +- Issue #14082: shutil.copy2() now copies extended attributes, if possible. + Patch by Hynek Schlawack. + +- Issue #13959: Make importlib.abc.FileLoader.load_module()/get_filename() and + importlib.machinery.ExtensionFileLoader.load_module() have their single + argument be optional. Allows for the replacement (and thus deprecation) of + imp.load_source()/load_package()/load_compiled(). + +- Issue #13959: imp.get_suffixes() has been deprecated in favour of the new + attributes on importlib.machinery: SOURCE_SUFFIXES, DEBUG_BYTECODE_SUFFIXES, + OPTIMIZED_BYTECODE_SUFFIXES, BYTECODE_SUFFIXES, and EXTENSION_SUFFIXES. This + led to an indirect deprecation of inspect.getmoduleinfo(). + +- Issue #14662: Prevent shutil failures on OS X when destination does not + support chflag operations. Patch by Hynek Schlawack. + +- Issue #14157: Fix time.strptime failing without a year on February 29th. + Patch by Hynek Schlawack. + +- Issue #14753: Make multiprocessing's handling of negative timeouts + the same as it was in Python 3.2. + +- Issue #14583: Fix importlib bug when a package's __init__.py would first + import one of its modules then raise an error. + +- Issue #14741: Fix missing support for Ellipsis ('...') in parser module. + +- Issue #14697: Fix missing support for set displays and set comprehensions in + parser module. + +- Issue #14701: Fix missing support for 'raise ... from' in parser module. + +- Add support for timeouts to the acquire() methods of + multiprocessing's lock/semaphore/condition proxies. + +- Issue #13989: Add support for text mode to gzip.open(). + +- Issue #14127: The os.stat() result object now provides three additional + fields: st_ctime_ns, st_mtime_ns, and st_atime_ns, providing those times as an + integer with nanosecond resolution. The functions os.utime(), os.lutimes(), + and os.futimes() now accept a new parameter, ns, which accepts mtime and atime + as integers with nanosecond resolution. + +- Issue #14127 and #10148: shutil.copystat now preserves exact mtime and atime + on filesystems providing nanosecond resolution. + +Tools/Demos +----------- + +- Issue #14695: Bring Tools/parser/unparse.py support up to date with + the Python 3.3 Grammar. + +Build +----- + +- Issue #14472: Update .gitignore. Patch by Matej Cepl. + +- Upgrade Windows library versions: bzip 1.0.6, OpenSSL 1.0.1c. + +- Issue #14693: Under non-Windows platforms, hashlib's fallback modules are + always compiled, even if OpenSSL is present at build time. + +- Issue #13210: Windows build now uses VS2010, ported from VS2008. + +Documentation +------------- + +- Issue #14588: The language reference now accurately documents the Python 3 + class definition process. Patch by Nick Coghlan. + +- Issue #14943: Correct a default argument value for winreg.OpenKey + and correctly list the argument names in the function's explanation. + + +What's New in Python 3.3.0 Alpha 3? +=================================== + +*Release date: 01-May-2012* + +Core and Builtins +----------------- + +- Issue #14699: Fix calling the classmethod descriptor directly. + +- Issue #14433: Prevent msvcrt crash in interactive prompt when stdin is closed. + +- Issue #14521: Make result of float('nan') and float('-nan') more consistent + across platforms. + +- Issue #14646: __import__() sets __loader__ if the loader did not. + +- Issue #14605: No longer have implicit entries in sys.meta_path. If + sys.meta_path is found to be empty, raise ImportWarning. + +- Issue #14605: No longer have implicit entries in sys.path_hooks. If + sys.path_hooks is found to be empty, a warning will be raised. None is now + inserted into sys.path_importer_cache if no finder was discovered. This also + means imp.NullImporter is no longer implicitly used. + +- Issue #13903: Implement PEP 412. Individual dictionary instances can now share + their keys with other dictionaries. Classes take advantage of this to share + their instance dictionary keys for improved memory and performance. + +- Issue #11603 (again): Setting __repr__ to __str__ now raises a RuntimeError + when repr() or str() is called on such an object. + +- Issue #14658: Fix binding a special method to a builtin implementation of a + special method with a different name. + +- Issue #14630: Fix a memory access bug for instances of a subclass of int + with value 0. + +- Issue #14339: Speed improvements to bin, oct and hex functions. Patch by + Serhiy Storchaka. + +- Issue #14098: New functions PyErr_GetExcInfo and PyErr_SetExcInfo. + Patch by Stefan Behnel. + +- Issue #14385: It is now possible to use a custom type for the __builtins__ + namespace, instead of a dict. It can be used for sandboxing for example. + Raise also a NameError instead of ImportError if __build_class__ name if not + found in __builtins__. + +- Issue #12599: Be more strict in accepting None compared to a false-like + object for importlib.util.module_for_loader and + importlib.machinery.PathFinder. + +- Issue #14612: Fix jumping around with blocks by setting f_lineno. + +- Issue #14592: Attempting a relative import w/o __package__ or __name__ set in + globals raises a KeyError. + +- Issue #14607: Fix keyword-only arguments which started with ``__``. + +- Issue #10854: The ImportError raised when an extension module on Windows + fails to import now uses the new path and name attributes from + Issue #1559549. + +- Issue #13889: Check and (if necessary) set FPU control word before calling + any of the dtoa.c string <-> float conversion functions, on MSVC builds of + Python. This fixes issues when embedding Python in a Delphi app. + +- __import__() now matches PEP 328 and documentation by defaulting 'index' to 0 + instead of -1 and removing support for negative values. + +- Issue #2377: Make importlib the implementation of __import__(). + +- Issue #1559549: ImportError now has 'name' and 'path' attributes that are set + using keyword arguments to its constructor. They are currently not set by + import as they are meant for use by importlib. + +- Issue #14474: Save and restore exception state in thread.start_new_thread() + while writing error message if the thread leaves a unhandled exception. + +- Issue #13019: Fix potential reference leaks in bytearray.extend(). Patch + by Suman Saha. + +Library +------- + +- Issue #14768: os.path.expanduser('~/a') doesn't works correctly when HOME is '/'. + +- Issue #14371: Support bzip2 in zipfile module. Patch by Serhiy Storchaka. + +- Issue #13183: Fix pdb skipping frames after hitting a breakpoint and running + step. Patch by Xavier de Gaye. + +- Issue #14696: Fix parser module to understand 'nonlocal' declarations. + +- Issue #10941: Fix imaplib.Internaldate2tuple to produce correct result near + the DST transition. Patch by Joe Peterson. + +- Issue #9154: Fix parser module to understand function annotations. + +- Issue #6085: In http.server.py SimpleHTTPServer.address_string returns the + client ip address instead client hostname. Patch by Charles-François Natali. + +- Issue #14309: Deprecate time.clock(), use time.perf_counter() or + time.process_time() instead. + +- Issue #14428: Implement the PEP 418. Add time.get_clock_info(), + time.perf_counter() and time.process_time() functions, and rename + time.steady() to time.monotonic(). + +- Issue #14646: importlib.util.module_for_loader() now sets __loader__ and + __package__ (when possible). + +- Issue #14664: It is now possible to use @unittest.skip{If,Unless} on a + test class that doesn't inherit from TestCase (i.e. a mixin). + +- Issue #4892: multiprocessing Connections can now be transferred over + multiprocessing Connections. Patch by Richard Oudkerk (sbt). + +- Issue #14160: TarFile.extractfile() failed to resolve symbolic links when + the links were not located in an archive subdirectory. + +- Issue #14638: pydoc now treats non-string __name__ values as if they + were missing, instead of raising an error. + +- Issue #13684: Fix httplib tunnel issue of infinite loops for certain sites + which send EOF without trailing \r\n. + +- Issue #14605: Add importlib.abc.FileLoader, importlib.machinery.(FileFinder, + SourceFileLoader, SourcelessFileLoader, ExtensionFileLoader). + +- Issue #13959: imp.cache_from_source()/source_from_cache() now follow + os.path.join()/split() semantics for path manipulation instead of its prior, + custom semantics of caring the right-most path separator forward in path + joining. + +- Issue #2193: Allow ":" character in Cookie NAME values. + +- Issue #14629: tokenizer.detect_encoding will specify the filename in the + SyntaxError exception if found at readline.__self__.name. + +- Issue #14629: Raise SyntaxError in tokenizer.detect_encoding if the + first two lines have non-UTF-8 characters without an encoding declaration. + +- Issue #14308: Fix an exception when a "dummy" thread is in the threading + module's active list after a fork(). + +- Issue #11750: The Windows API functions scattered in the _subprocess and + _multiprocessing.win32 modules now live in a single module "_winapi". + Patch by sbt. + +- Issue #14087: multiprocessing: add Condition.wait_for(). Patch by sbt. + +- Issue #14538: HTMLParser can now parse correctly start tags that contain + a bare '/'. + +- Issue #14452: SysLogHandler no longer inserts a UTF-8 BOM into the message. + +- Issue #14386: Expose the dict_proxy internal type as types.MappingProxyType. + +- Issue #13959: Make imp.reload() always use a module's __loader__ to perform + the reload. + +- Issue #13959: Add imp.py and rename the built-in module to _imp, allowing for + re-implementing parts of the module in pure Python. + +- Issue #13496: Fix potential overflow in bisect.bisect algorithm when applied + to a collection of size > sys.maxsize / 2. + +- Have importlib take advantage of ImportError's new 'name' and 'path' + attributes. + +- Issue #14399: zipfile now recognizes that the archive has been modified even + if only the comment is changed. In addition, the TypeError that results from + trying to set a non-binary value as a comment is now now raised at the time + the comment is set rather than at the time the zipfile is written. + +- trace.CoverageResults.is_ignored_filename() now ignores any name that starts + with "<" and ends with ">" instead of special-casing "<string>" and + "<doctest ". + +- Issue #12537: The mailbox module no longer depends on knowledge of internal + implementation details of the email package Message object. + +- Issue #7978: socketserver now restarts the select() call when EINTR is + returned. This avoids crashing the server loop when a signal is received. + Patch by Jerzy Kozera. + +- Issue #14522: Avoid duplicating socket handles in multiprocessing.connection. + Patch by sbt. + +- Don't Py_DECREF NULL variable in io.IncrementalNewlineDecoder. + +- Issue #8515: Set __file__ when run file in IDLE. + Initial patch by Bruce Frederiksen. + +- Issue #14496: Fix wrong name in idlelib/tabbedpages.py. + Patch by Popa Claudiu. + +- Issue #3033: Add displayof parameter to tkinter font. Patch by Guilherme Polo. + +- Issue #14482: Raise a ValueError, not a NameError, when trying to create + a multiprocessing Client or Listener with an AF_UNIX type address under + Windows. Patch by Popa Claudiu. + +- Issue #802310: Generate always unique tkinter font names if not directly passed. + +- Issue #14151: Raise a ValueError, not a NameError, when trying to create + a multiprocessing Client or Listener with an AF_PIPE type address under + non-Windows platforms. Patch by Popa Claudiu. + +- Issue #14493: Use gvfs-open or xdg-open in webbrowser. + +Build +----- + +- "make touch" will now touch generated files that are checked into Mercurial, + after a "hg update" which failed to bring the timestamps into the right order. + +Tests +----- + +- Issue #14026: In test_cmd_line_script, check that sys.argv is populated + correctly for the various invocation approaches (Patch by Jason Yeo) + +- Issue #14032: Fix incorrect variable name in test_cmd_line_script debugging + message (Patch by Jason Yeo) + +- Issue #14589: Update certificate chain for sha256.tbs-internet.com, fixing + a test failure in test_ssl. + +- Issue #14355: Regrtest now supports the standard unittest test loading, and + will use it if a test file contains no `test_main` method. + +Tools / Demos +------------- + +- Issue #3561: The Windows installer now has an option, off by default, for + placing the Python installation into the system "Path" environment variable. + +- Issue #13165: stringbench is now available in the Tools/stringbench folder. + It used to live in its own SVN project. + + +What's New in Python 3.3.0 Alpha 2? +=================================== + +*Release date: 01-Apr-2012* + +Core and Builtins +----------------- + +- Issue #1683368: object.__new__ and object.__init__ raise a TypeError if they + are passed arguments and their complementary method is not overridden. + +- Issue #14378: Fix compiling ast.ImportFrom nodes with a "__future__" string as + the module name that was not interned. + +- Issue #14331: Use significantly less stack space when importing modules by + allocating path buffers on the heap instead of the stack. + +- Issue #14334: Prevent in a segfault in type.__getattribute__ when it was not + passed strings. + +- Issue #1469629: Allow cycles through an object's __dict__ slot to be + collected. (For example if ``x.__dict__ is x``). + +- Issue #14205: dict lookup raises a RuntimeError if the dict is modified + during a lookup. + +- Issue #14220: When a generator is delegating to another iterator with the + yield from syntax, it needs to have its ``gi_running`` flag set to True. + +- Issue #14435: Remove dedicated block allocator from floatobject.c and rely + on the PyObject_Malloc() api like all other objects. + +- Issue #14471: Fix a possible buffer overrun in the winreg module. + +- Issue #14288: Allow the serialization of builtin iterators + +Library +------- + +- Issue #14300: Under Windows, sockets created using socket.dup() now allow + overlapped I/O. Patch by sbt. + +- Issue #13872: socket.detach() now marks the socket closed (as mirrored + in the socket repr()). Patch by Matt Joiner. + +- Issue #14406: Fix a race condition when using ``concurrent.futures.wait( + return_when=ALL_COMPLETED)``. Patch by Matt Joiner. + +- Issue #5136: deprecate old, unused functions from tkinter. + +- Issue #14409: IDLE now properly executes commands in the Shell window + when it cannot read the normal config files on startup and + has to use the built-in default key bindings. + There was previously a bug in one of the defaults. + +- Issue #14416: syslog now defines the LOG_ODELAY and LOG_AUTHPRIV constants + if they are defined in <syslog.h>. + +- IDLE can be launched as python -m idlelib + +- Issue #14295: Add unittest.mock + +- Issue #7652: Add --with-system-libmpdec option to configure for linking + the _decimal module against an installed libmpdec. + +- Issue #14380: MIMEText now defaults to utf-8 when passed non-ASCII unicode + with no charset specified. + +- Issue #10340: asyncore - properly handle EINVAL in dispatcher constructor on + OSX; avoid to call handle_connect in case of a disconnected socket which + was not meant to connect. + +- Issue #14204: The ssl module now has support for the Next Protocol + Negotiation extension, if available in the underlying OpenSSL library. + Patch by Colin Marc. + +- Issue #3035: Unused functions from tkinter are marked as pending deprecated. + +- Issue #12757: Fix the skipping of doctests when python is run with -OO so + that it works in unittest's verbose mode as well as non-verbose mode. + +- Issue #7652: Integrate the decimal floating point libmpdec library to speed + up the decimal module. Performance gains of the new C implementation are + between 10x and 100x, depending on the application. + +- Issue #3573: IDLE hangs when passing invalid command line args + (directory(ies) instead of file(s)) (Patch by Guilherme Polo) + +- Issue #14269: SMTPD now conforms to the RFC and requires a HELO command + before MAIL, RCPT, or DATA. + +- Issue #13694: asynchronous connect in asyncore.dispatcher does not set addr + attribute. + +- Issue #14344: fixed the repr of email.policy objects. + +- Issue #11686: Added missing entries to email package __all__ lists + (mostly the new Bytes classes). + +- Issue #14335: multiprocessing's custom Pickler subclass now inherits from + the C-accelerated implementation. Patch by sbt. + +- Issue #10484: Fix the CGIHTTPServer's PATH_INFO handling problem. + +- Issue #11199: Fix the with urllib which hangs on particular ftp urls. + +- Improve the memory utilization and speed of functools.lru_cache. + +- Issue #14222: Use the new time.steady() function instead of time.time() for + timeout in queue and threading modules to not be affected of system time + update. + +- Issue #13248: Remove lib2to3.pytree.Base.get_prefix/set_prefix. + +- Issue #14234: CVE-2012-0876: Randomize hashes of xml attributes in the hash + table internal to the pyexpat module's copy of the expat library to avoid a + denial of service due to hash collisions. Patch by David Malcolm with some + modifications by the expat project. + +- Issue #14200: Idle shell crash on printing non-BMP unicode character. + +- Issue #12818: format address no longer needlessly \ escapes ()s in names when + the name ends up being quoted. + +- Issue #14062: BytesGenerator now correctly folds Header objects, + including using linesep when folding. + +- Issue #13839: When invoked on the command-line, the pstats module now + accepts several filenames of profile stat files and merges them all. + Patch by Matt Joiner. + +- Issue #14291: Email now defaults to utf-8 for non-ASCII unicode headers + instead of raising an error. This fixes a regression relative to 2.7. + +- Issue #989712: Support using Tk without a mainloop. + +- Issue #5219: Prevent event handler cascade in IDLE. + +- Issue #3835: Refuse to use unthreaded Tcl in threaded Python. + +- Issue #2843: Add new Tk API to Tkinter. + +- Issue #14184: Increase the default stack size for secondary threads on + Mac OS X to avoid interpreter crashes when using threads on 10.7. + +- Issue #14180: datetime.date.fromtimestamp(), + datetime.datetime.fromtimestamp() and datetime.datetime.utcfromtimestamp() + now raise an OSError instead of ValueError if localtime() or gmtime() failed. + +- Issue #14180: time.ctime(), gmtime(), time.localtime(), + datetime.date.fromtimestamp(), datetime.datetime.fromtimestamp() and + datetime.datetime.utcfromtimestamp() now raises an OverflowError, instead of + a ValueError, if the timestamp does not fit in time_t. + +- Issue #14180: datetime.datetime.fromtimestamp() and + datetime.datetime.utcfromtimestamp() now round microseconds towards zero + instead of rounding to nearest with ties going away from zero. + +- Issue #10543: Fix unittest test discovery with Jython bytecode files. + +- Issue #1178863: Separate initialisation from setting when initializing + Tkinter.Variables; harmonize exceptions to ValueError; only delete variables + that have not been deleted; assert that variable names are strings. + +- Issue #14104: Implement time.monotonic() on Mac OS X, patch written by + Nicholas Riley. + +- Issue #13394: the aifc module now uses warnings.warn() to signal warnings. + +- Issue #14252: Fix subprocess.Popen.terminate() to not raise an error under + Windows when the child process has already exited. + +- Issue #14223: curses.addch() is no more limited to the range 0-255 when the + Python curses is not linked to libncursesw. It was a regression introduced + in Python 3.3a1. + +- Issue #14168: Check for presence of Element._attrs in minidom before + accessing it. + +- Issue #12328: Fix multiprocessing's use of overlapped I/O on Windows. + Also, add a multiprocessing.connection.wait(rlist, timeout=None) function + for polling multiple objects at once. Patch by sbt. + +- Issue #14007: Accept incomplete TreeBuilder objects (missing start, end, + data or close method) for the Python implementation as well. + Drop the no-op TreeBuilder().xml() method from the C implementation. + +- Issue #14210: pdb now has tab-completion not only for command names, but + also for their arguments, wherever possible. + +- Issue #14310: Sockets can now be with other processes on Windows using + the api socket.socket.share() and socket.fromshare(). + +- Issue #10576: The gc module now has a 'callbacks' member that will get + called when garbage collection takes place. + +Build +----- + +- Issue #14557: Fix extensions build on HP-UX. Patch by Adi Roiban. + +- Issue #14387: Do not include accu.h from Python.h. + +- Issue #14359: Only use O_CLOEXEC in _posixmodule.c if it is defined. + Based on patch from Hervé Coatanhay. + +- Issue #14321: Do not run pgen during the build if files are up to date. + +Documentation +------------- + +- Issue #14034: added the argparse tutorial. + +- Issue #14324: Fix configure tests for cross builds. + +- Issue #14327: Call AC_CANONICAL_HOST in configure.ac and check in + config.{guess,sub}. Don't use uname calls for cross builds. + +Extension Modules +----------------- + +- Issue #9041: An issue in ctypes.c_longdouble, ctypes.c_double, and + ctypes.c_float that caused an incorrect exception to be returned in the + case of overflow has been fixed. + +- Issue #14212: The re module didn't retain a reference to buffers it was + scanning, resulting in segfaults. + +- Issue #14259: The finditer() method of re objects did not take any + keyword arguments, contrary to the documentation. + +- Issue #10142: Support for SEEK_HOLE/SEEK_DATA (for example, under ZFS). + +Tests +----- + +- Issue #14442: Add missing errno import in test_smtplib. + +- Issue #8315: (partial fix) python -m unittest test.test_email now works. + + +What's New in Python 3.3.0 Alpha 1? +=================================== + +*Release date: 05-Mar-2012* + +Core and Builtins +----------------- + +- Issue #14172: Fix reference leak when marshalling a buffer-like object + (other than a bytes object). + +- Issue #13521: dict.setdefault() now does only one lookup for the given key, + making it "atomic" for many purposes. Patch by Filip Gruszczyński. + +- PEP 409, Issue #6210: "raise X from None" is now supported as a means of + suppressing the display of the chained exception context. The chained + context still remains available as the __context__ attribute. + +- Issue #10181: New memoryview implementation fixes multiple ownership + and lifetime issues of dynamically allocated Py_buffer members (#9990) + as well as crashes (#8305, #7433). Many new features have been added + (See whatsnew/3.3), and the documentation has been updated extensively. + The ndarray test object from _testbuffer.c implements all aspects of + PEP-3118, so further development towards the complete implementation + of the PEP can proceed in a test-driven manner. + + Thanks to Nick Coghlan, Antoine Pitrou and Pauli Virtanen for review + and many ideas. + +- Issue #12834: Fix incorrect results of memoryview.tobytes() for + non-contiguous arrays. + +- Issue #5231: Introduce memoryview.cast() method that allows changing + format and shape without making a copy of the underlying memory. + +- Issue #14084: Fix a file descriptor leak when importing a module with a + bad encoding. + +- Upgrade Unicode data to Unicode 6.1. + +- Issue #14040: Remove rarely used file name suffixes for C extensions + (under POSIX mainly). + +- Issue #14051: Allow arbitrary attributes to be set of classmethod and + staticmethod. + +- Issue #13703: oCERT-2011-003: Randomize hashes of str and bytes to protect + against denial of service attacks due to hash collisions within the dict and + set types. Patch by David Malcolm, based on work by Victor Stinner. + +- Issue #13020: Fix a reference leak when allocating a structsequence object + fails. Patch by Suman Saha. + +- Issue #13908: Ready types returned from PyType_FromSpec. + +- Issue #11235: Fix OverflowError when trying to import a source file whose + modification time doesn't fit in a 32-bit timestamp. + +- Issue #12705: A SyntaxError exception is now raised when attempting to + compile multiple statements as a single interactive statement. + +- Fix the builtin module initialization code to store the init function for + future reinitialization. + +- Issue #8052: The posix subprocess module would take a long time closing + all possible file descriptors in the child process rather than just open + file descriptors. It now closes only the open fds if possible for the + default close_fds=True behavior. + +- Issue #13629: Renumber the tokens in token.h so that they match the indexes + into _PyParser_TokenNames. + +- Issue #13752: Add a casefold() method to str. + +- Issue #13761: Add a "flush" keyword argument to the print() function, + used to ensure flushing the output stream. + +- Issue #13645: pyc files now contain the size of the corresponding source + code, to avoid timestamp collisions (especially on filesystems with a low + timestamp resolution) when checking for freshness of the bytecode. + +- PEP 380, Issue #11682: Add "yield from <x>" to support easy delegation to + subgenerators (initial patch by Greg Ewing, integration into 3.3 by + Renaud Blanch, Ryan Kelly, Zbigniew Jędrzejewski-Szmek and Nick Coghlan) + +- Issue #13748: Raw bytes literals can now be written with the ``rb`` prefix + as well as ``br``. + +- Issue #12736: Use full unicode case mappings for upper, lower, and title case. + +- Issue #12760: Add a create mode to open(). Patch by David Townshend. + +- Issue #13738: Simplify implementation of bytes.lower() and bytes.upper(). + +- Issue #13577: Built-in methods and functions now have a __qualname__. + Patch by sbt. + +- Issue #6695: Full garbage collection runs now clear the freelist of set + objects. Initial patch by Matthias Troffaes. + +- Fix OSError.__init__ and OSError.__new__ so that each of them can be + overriden and take additional arguments (followup to issue #12555). + +- Fix the fix for issue #12149: it was incorrect, although it had the side + effect of appearing to resolve the issue. Thanks to Mark Shannon for + noticing. + +- Issue #13505: Pickle bytes objects in a way that is compatible with + Python 2 when using protocols <= 2. + +- Issue #11147: Fix an unused argument in _Py_ANNOTATE_MEMORY_ORDER. (Fix + given by Campbell Barton). + +- Issue #13503: Use a more efficient reduction format for bytearrays with + pickle protocol >= 3. The old reduction format is kept with older protocols + in order to allow unpickling under Python 2. Patch by Irmen de Jong. + +- Issue #7111: Python can now be run without a stdin, stdout or stderr + stream. It was already the case with Python 2. However, the corresponding + sys module entries are now set to None (instead of an unusable file object). + +- Issue #11849: Ensure that free()d memory arenas are really released + on POSIX systems supporting anonymous memory mappings. Patch by + Charles-François Natali. + +- Issue #13452: PyUnicode_EncodeDecimal() doesn't support error handlers + different than "strict" anymore. The caller was unable to compute the + size of the output buffer: it depends on the error handler. + +- PEP 3155 / issue #13448: Qualified name for classes and functions. + +- Issue #13436: Fix a bogus error message when an AST object was passed + an invalid integer value. + +- Issue #13411: memoryview objects are now hashable when the underlying + object is hashable. + +- Issue #13338: Handle all enumerations in _Py_ANNOTATE_MEMORY_ORDER + to allow compiling extension modules with -Wswitch-enum on gcc. + Initial patch by Floris Bruynooghe. + +- Issue #10227: Add an allocation cache for a single slice object. Patch by + Stefan Behnel. + +- Issue #13393: BufferedReader.read1() now asks the full requested size to + the raw stream instead of limiting itself to the buffer size. + +- Issue #13392: Writing a pyc file should now be atomic under Windows as well. + +- Issue #13333: The UTF-7 decoder now accepts lone surrogates (the encoder + already accepts them). + +- Issue #13389: Full garbage collection passes now clear the freelists for + list and dict objects. They already cleared other freelists in the + interpreter. + +- Issue #13327: Remove the need for an explicit None as the second argument + to os.utime, os.lutimes, os.futimes, os.futimens, os.futimesat, in + order to update to the current time. Also added keyword argument + handling to os.utimensat in order to remove the need for explicit None. + +- Issue #13350: Simplify some C code by replacing most usages of + PyUnicode_Format by PyUnicode_FromFormat. + +- Issue #13342: input() used to ignore sys.stdin's and sys.stdout's unicode + error handler in interactive mode (when calling into PyOS_Readline()). + +- Issue #9896: Add start, stop, and step attributes to range objects. + +- Issue #13343: Fix a SystemError when a lambda expression uses a global + variable in the default value of a keyword-only argument: ``lambda *, + arg=GLOBAL_NAME: None`` + +- Issue #12797: Added custom opener parameter to builtin open() and + FileIO.open(). + +- Issue #10519: Avoid unnecessary recursive function calls in + setobject.c. + +- Issue #10363: Deallocate global locks in Py_Finalize(). + +- Issue #13018: Fix reference leaks in error paths in dictobject.c. + Patch by Suman Saha. + +- Issue #13201: Define '==' and '!=' to compare range objects based on + the sequence of values they define (instead of comparing based on + object identity). + +- Issue #1294232: In a few cases involving metaclass inheritance, the + interpreter would sometimes invoke the wrong metaclass when building a new + class object. These cases now behave correctly. Patch by Daniel Urban. + +- Issue #12753: Add support for Unicode name aliases and named sequences. + Both ``unicodedata.lookup()`` and '\N{...}' now resolve aliases, + and ``unicodedata.lookup()`` resolves named sequences too. + +- Issue #12170: The count(), find(), rfind(), index() and rindex() methods + of bytes and bytearray objects now accept an integer between 0 and 255 + as their first argument. Patch by Petri Lehtinen. + +- Issue #12604: VTRACE macro expanded to no-op in _sre.c to avoid compiler + warnings. Patch by Josh Triplett and Petri Lehtinen. + +- Issue #12281: Rewrite the MBCS codec to handle correctly replace and ignore + error handlers on all Windows versions. The MBCS codec is now supporting all + error handlers, instead of only replace to encode and ignore to decode. + +- Issue #13188: When called without an explicit traceback argument, + generator.throw() now gets the traceback from the passed exception's + ``__traceback__`` attribute. Patch by Petri Lehtinen. + +- Issue #13146: Writing a pyc file is now atomic under POSIX. + +- Issue #7833: Extension modules built using distutils on Windows will no + longer include a "manifest" to prevent them failing at import time in some + embedded situations. + +- PEP 3151 / issue #12555: reworking the OS and IO exception hierarchy. + +- Issue #13560: Add PyUnicode_DecodeLocale(), PyUnicode_DecodeLocaleAndSize() + and PyUnicode_EncodeLocale() functions to the C API to decode/encode from/to + the current locale encoding. + +- Add internal API for static strings (_Py_identifier et al.). + +- Issue #13063: the Windows error ERROR_NO_DATA (numbered 232 and described + as "The pipe is being closed") is now mapped to POSIX errno EPIPE + (previously EINVAL). + +- Issue #12911: Fix memory consumption when calculating the repr() of huge + tuples or lists. + +- PEP 393: flexible string representation. Thanks to Torsten Becker for the + initial implementation, and Victor Stinner for various bug fixes. + +- Issue #14081: The 'sep' and 'maxsplit' parameter to str.split, bytes.split, + and bytearray.split may now be passed as keyword arguments. + +- Issue #13012: The 'keepends' parameter to str.splitlines may now be passed + as a keyword argument: "my_string.splitlines(keepends=True)". The same + change also applies to bytes.splitlines and bytearray.splitlines. + +- Issue #7732: Don't open a directory as a file anymore while importing a + module. Ignore the direcotry if its name matchs the module name (e.g. + "__init__.py") and raise a ImportError instead. + +- Issue #13021: Missing decref on an error path. Thanks to Suman Saha for + finding the bug and providing a patch. + +- Issue #12973: Fix overflow checks that relied on undefined behaviour in + list_repeat (listobject.c) and islice_next (itertoolsmodule.c). These bugs + caused test failures with recent versions of Clang. + +- Issue #12904: os.utime, os.futimes, os.lutimes, and os.futimesat now write + atime and mtime with nanosecond precision on modern POSIX platforms. + +- Issue #12802: the Windows error ERROR_DIRECTORY (numbered 267) is now + mapped to POSIX errno ENOTDIR (previously EINVAL). + +- Issue #9200: The str.is* methods now work with strings that contain non-BMP + characters even in narrow Unicode builds. + +- Issue #12791: Break reference cycles early when a generator exits with + an exception. + +- Issue #12773: Make __doc__ mutable on user-defined classes. + +- Issue #12766: Raise a ValueError when creating a class with a class variable + that conflicts with a name in __slots__. + +- Issue #12266: Fix str.capitalize() to correctly uppercase/lowercase + titlecased and cased non-letter characters. + +- Issue #12732: In narrow unicode builds, allow Unicode identifiers which fall + outside the BMP. + +- Issue #12575: Validate user-generated AST before it is compiled. + +- Make type(None), type(Ellipsis), and type(NotImplemented) callable. They + return the respective singleton instances. + +- Forbid summing bytes with sum(). + +- Verify the types of AST strings and identifiers provided by the user before + compiling them. + +- Issue #12647: The None object now has a __bool__() method that returns False. + Formerly, bool(None) returned False only because of special case logic + in PyObject_IsTrue(). + +- Issue #12579: str.format_map() now raises a ValueError if used on a + format string that contains positional fields. Initial patch by + Julian Berman. + +- Issue #10271: Allow warnings.showwarning() be any callable. + +- Issue #11627: Fix segfault when __new__ on a exception returns a + non-exception class. + +- Issue #12149: Update the method cache after a type's dictionary gets + cleared by the garbage collector. This fixes a segfault when an instance + and its type get caught in a reference cycle, and the instance's + deallocator calls one of the methods on the type (e.g. when subclassing + IOBase). Diagnosis and patch by Davide Rizzo. + +- Issue #9611, #9015: FileIO.read() clamps the length to INT_MAX on Windows. + +- Issue #9642: Uniformize the tests on the availability of the mbcs codec, add + a new HAVE_MBCS define. + +- Issue #9642: Fix filesystem encoding initialization: use the ANSI code page + on Windows if the mbcs codec is not available, and fail with a fatal error if + we cannot get the locale encoding (if nl_langinfo(CODESET) is not available) + instead of using UTF-8. + +- When a generator yields, do not retain the caller's exception state on the + generator. + +- Issue #12475: Prevent generators from leaking their exception state into the + caller's frame as they return for the last time. + +- Issue #12291: You can now load multiple marshalled objects from a stream, + with other data interleaved between marshalled objects. + +- Issue #12356: When required positional or keyword-only arguments are not + given, produce a informative error message which includes the name(s) of the + missing arguments. + +- Issue #12370: Fix super with no arguments when __class__ is overriden in the + class body. + +- Issue #12084: os.stat on Windows now works properly with relative symbolic + links when called from any directory. + +- Loosen type restrictions on the __dir__ method. __dir__ can now return any + sequence, which will be converted to a list and sorted by dir(). + +- Issue #12265: Make error messages produced by passing an invalid set of + arguments to a function more informative. + +- Issue #12225: Still allow Python to build if Python is not in its hg repo or + mercurial is not installed. + +- Issue #1195: my_fgets() now always clears errors before calling fgets(). Fix + the following case: sys.stdin.read() stopped with CTRL+d (end of file), + raw_input() interrupted by CTRL+c. + +- Issue #12216: Allow unexpected EOF errors to happen on any line of the file. + +- Issue #12199: The TryExcept and TryFinally and AST nodes have been unified + into a Try node. + +- Issue #9670: Increase the default stack size for secondary threads on + Mac OS X and FreeBSD to reduce the chances of a crash instead of a + "maximum recursion depth" RuntimeError exception. + (patch by Ronald Oussoren) + +- Issue #12106: The use of the multiple-with shorthand syntax is now reflected + in the AST. + +- Issue #12190: Try to use the same filename object when compiling unmarshalling + a code objects in the same file. + +- Issue #12166: Move implementations of dir() specialized for various types into + the __dir__() methods of those types. + +- Issue #5715: In socketserver, close the server socket in the child process. + +- Correct lookup of __dir__ on objects. Among other things, this causes errors + besides AttributeError found on lookup to be propagated. + +- Issue #12060: Use sig_atomic_t type and volatile keyword in the signal + module. Patch written by Charles-François Natali. + +- Issue #1746656: Added the if_nameindex, if_indextoname, if_nametoindex + methods to the socket module. + +- Issue #12044: Fixed subprocess.Popen when used as a context manager to + wait for the process to end when exiting the context to avoid unintentionally + leaving zombie processes around. + +- Issue #1195: Fix input() if it is interrupted by CTRL+d and then CTRL+c, + clear the end-of-file indicator after CTRL+d. + +- Issue #1856: Avoid crashes and lockups when daemon threads run while the + interpreter is shutting down; instead, these threads are now killed when + they try to take the GIL. + +- Issue #9756: When calling a method descriptor or a slot wrapper descriptor, + the check of the object type doesn't read the __class__ attribute anymore. + Fix a crash if a class override its __class__ attribute (e.g. a proxy of the + str type). Patch written by Andreas Stührk. + +- Issue #10517: After fork(), reinitialize the TLS used by the PyGILState_* + APIs, to avoid a crash with the pthread implementation in RHEL 5. Patch + by Charles-François Natali. + +- Issue #10914: Initialize correctly the filesystem codec when creating a new + subinterpreter to fix a bootstrap issue with codecs implemented in Python, as + the ISO-8859-15 codec. + +- Issue #11918: OS/2 and VMS are no more supported because of the lack of + maintainer. + +- Issue #6780: fix starts/endswith error message to mention that tuples are + accepted too. + +- Issue #5057: fix a bug in the peepholer that led to non-portable pyc files + between narrow and wide builds while optimizing BINARY_SUBSCR on non-BMP + chars (e.g. "\U00012345"[0]). + +- Issue #11845: Fix typo in rangeobject.c that caused a crash in + compute_slice_indices. Patch by Daniel Urban. + +- Issue #5673: Added a `timeout` keyword argument to subprocess.Popen.wait, + subprocess.Popen.communicated, subprocess.call, subprocess.check_call, and + subprocess.check_output. If the blocking operation takes more than `timeout` + seconds, the `subprocess.TimeoutExpired` exception is raised. + +- Issue #11650: PyOS_StdioReadline() retries fgets() if it was interrupted + (EINTR), for example if the program is stopped with CTRL+z on Mac OS X. Patch + written by Charles-Francois Natali. + +- Issue #9319: Include the filename in "Non-UTF8 code ..." syntax error. + +- Issue #10785: Store the filename as Unicode in the Python parser. + +- Issue #11619: _PyImport_LoadDynamicModule() doesn't encode the path to bytes + on Windows. + +- Issue #10998: Remove mentions of -Q, sys.flags.division_warning and + Py_DivisionWarningFlag left over from Python 2. + +- Issue #11244: Remove an unnecessary peepholer check that was preventing + negative zeros from being constant-folded properly. + +- Issue #11395: io.FileIO().write() clamps the data length to 32,767 bytes on + Windows if the file is a TTY to workaround a Windows bug. The Windows console + returns an error (12: not enough space error) on writing into stdout if + stdout mode is binary and the length is greater than 66,000 bytes (or less, + depending on heap usage). + +- Issue #11320: fix bogus memory management in Modules/getpath.c, leading to + a possible crash when calling Py_SetPath(). + +- Issue #11432: A bug was introduced in subprocess.Popen on posix systems with + 3.2.0 where the stdout or stderr file descriptor being the same as the stdin + file descriptor would raise an exception. webbrowser.open would fail. fixed. + +- Issue #9856: Change object.__format__ with a non-empty format string + to be a DeprecationWarning. In 3.2 it was a PendingDeprecationWarning. + In 3.4 it will be a TypeError. + +- Issue #11244: The peephole optimizer is now able to constant-fold + arbitrarily complex expressions. This also fixes a 3.2 regression where + operations involving negative numbers were not constant-folded. + +- Issue #11450: Don't truncate hg version info in Py_GetBuildInfo() when + there are many tags (e.g. when using mq). Patch by Nadeem Vawda. + +- Issue #11335: Fixed a memory leak in list.sort when the key function + throws an exception. + +- Issue #8923: When a string is encoded to UTF-8 in strict mode, the result is + cached into the object. Examples: str.encode(), str.encode('utf-8'), + PyUnicode_AsUTF8String() and PyUnicode_AsEncodedString(unicode, "utf-8", + NULL). + +- Issue #10831: PyUnicode_FromFormat() supports %li, %lli and %zi formats. + +- Issue #10829: Refactor PyUnicode_FromFormat(), use the same function to parse + the format string in the 3 steps, fix crashs on invalid format strings. + +- Issue #13007: whichdb should recognize gdbm 1.9 magic numbers. + +- Issue #11246: Fix PyUnicode_FromFormat("%V") to decode the byte string from + UTF-8 (with replace error handler) instead of ISO-8859-1 (in strict mode). + Patch written by Ray Allen. + +- Issue #11286: Raise a ValueError from calling PyMemoryView_FromBuffer with + a buffer struct having a NULL data pointer. + +- Issue #11272: On Windows, input() strips '\r' (and not only '\n'), and + sys.stdin uses universal newline (replace '\r\n' by '\n'). + +- Issue #11828: startswith and endswith now accept None as slice index. + Patch by Torsten Becker. + +- Issue #10830: Fix PyUnicode_FromFormatV("%c") for non-BMP characters on + narrow build. + +- Issue #11168: Remove filename debug variable from PyEval_EvalFrameEx(). + It encoded the Unicode filename to UTF-8, but the encoding fails on + undecodable filename (on surrogate characters) which raises an unexpected + UnicodeEncodeError on recursion limit. + +- Issue #11187: Remove bootstrap code (use ASCII) of + PyUnicode_AsEncodedString(), it was replaced by a better fallback (use the + locale encoding) in PyUnicode_EncodeFSDefault(). + +- Check for NULL result in PyType_FromSpec. + +- Issue #10516: New copy() and clear() methods for lists and bytearrays. + +- Issue #11386: bytearray.pop() now throws IndexError when the bytearray is + empty, instead of OverflowError. + +- Issue #12380: The rjust, ljust and center methods of bytes and bytearray + now accept a bytearray argument. + +Library +------- + +- Issue #14195: An issue that caused weakref.WeakSet instances to incorrectly + return True for a WeakSet instance 'a' in both 'a < a' and 'a > a' has been + fixed. + +- Issue #14166: Pickler objects now have an optional ``dispatch_table`` + attribute which allows to set custom per-pickler reduction functions. + Patch by sbt. + +- Issue #14177: marshal.loads() now raises TypeError when given an unicode + string. Patch by Guilherme Gonçalves. + +- Issue #13550: Remove the debug machinery from the threading module: remove + verbose arguments from all threading classes and functions. + +- Issue #14159: Fix the len() of weak containers (WeakSet, WeakKeyDictionary, + WeakValueDictionary) to return a better approximation when some objects + are dead or dying. Moreover, the implementation is now O(1) rather than + O(n). + +- Issue #13125: Silence spurious test_lib2to3 output when in non-verbose mode. + Patch by Mikhail Novikov. + +- Issue #11841: Fix comparison bug with 'rc' versions in packaging.version. + Patch by Filip Gruszczyński. + +- Issue #13447: Add a test file to host regression tests for bugs in the + scripts found in the Tools directory. + +- Issue #6884: Fix long-standing bugs with MANIFEST.in parsing in distutils + on Windows. Also fixed in packaging. + +- Issue #8033: sqlite3: Fix 64-bit integer handling in user functions + on 32-bit architectures. Initial patch by Philippe Devalkeneer. + +Extension Modules +----------------- + +- Issue #15676: Now "mmap" check for empty files before doing the + offset check. Patch by Steven Willis. + +- Issue #6493: An issue in ctypes on Windows that caused structure bitfields + of type ctypes.c_uint32 and width 32 to incorrectly be set has been fixed. + +- Issue #15000: Support the "unique" x32 architecture in _posixsubprocess.c. + +- Issue #9041: An issue in ctypes.c_longdouble, ctypes.c_double, and + ctypes.c_float that caused an incorrect exception to be returned in the + case of overflow has been fixed. + +- Issue #14212: The re module didn't retain a reference to buffers it was + scanning, resulting in segfaults. + +Tests +----- + +- Issue #15304: Fix warning message when os.chdir() fails inside + test.support.temp_cwd(). Patch by Chris Jerdonek. + +- Issue #15802: Fix test logic in TestMaildir.test_create_tmp. Patch + by Serhiy Storchaka. + +- Issue #15747: ZFS always returns EOPNOTSUPP when attempting to set the + UF_IMMUTABLE flag (via either chflags or lchflags); refactor affected + tests in test_posix.py to account for this. + +- Issue #15285: Refactor the approach for testing connect timeouts using + two external hosts that have been configured specifically for this type + of test. + +- Issue #15615: Add some tests for the json module's handling of invalid + input data. Patch by Kushal Das. + +- Issue #15496: Add directory removal helpers for tests on Windows. + Patch by Jeremy Kloth. + +- Issue #15467: Move helpers for __sizeof__ tests into test_support. + Patch by Serhiy Storchaka. + +- Issue #15320: Make iterating the list of tests thread-safe when running + tests in multiprocess mode. Patch by Chris Jerdonek. + +- Issue #15230: Adopted a more systematic approach in the runpy tests + +- Issue #15300: Ensure the temporary test working directories are in the same + parent folder when running tests in multiprocess mode from a Python build. + Patch by Chris Jerdonek. + +- test_nntplib now tolerates being run from behind NNTP gateways that add + "X-Antivirus" headers to articles + +- Issue #15043: test_gdb is now skipped entirely if gdb security settings + block loading of the gdb hooks + +- Issue #14026: In test_cmd_line_script, check that sys.argv is populated + correctly for the various invocation approaches (Patch by Jason Yeo) + +- Issue #14032: Fix incorrect variable name in test_cmd_line_script debugging + message (Patch by Jason Yeo) + +- Issue #14589: Update certificate chain for sha256.tbs-internet.com, fixing + a test failure in test_ssl. + +Build +----- + +- Issue #15923: fix a mistake in asdl_c.py that resulted in a TypeError after + 2801bf875a24 (see #15801). + +- Issue #11715: Fix multiarch detection without having Debian development + tools (dpkg-dev) installed. + +- Issue #15819: Make sure we can build Python out-of-tree from a readonly + source directory. (Somewhat related to Issue #9860.) + +- Issue #15822: Ensure 2to3 grammar pickles are properly installed. + +- Issue #15560: Fix building _sqlite3 extension on OS X with an SDK. + +- Issue #8847: Disable COMDAT folding in Windows PGO builds. + +- Issue #14197: For OS X framework builds, ensure links to the shared + library are created with the proper ABI suffix. + +- Issue #14472: Update .gitignore. Patch by Matej Cepl. + +- The Windows build now uses OpenSSL 1.0.0j and bzip2 1.0.6. + +- Issue #14557: Fix extensions build on HP-UX. Patch by Adi Roiban. + +- Issue #14437: Fix building the _io module under Cygwin. + +- Issue #14387: Do not include accu.h from Python.h. + +- Issue #14359: Only use O_CLOEXEC in _posixmodule.c if it is defined. + Based on patch from Hervé Coatanhay. + +- Issue #14018: Fix OS X Tcl/Tk framework checking when using OS X SDKs. + +Documentation +------------- + +- Issue #16115: Improve subprocess.Popen() documentation around args, shell, + and executable arguments. + +- Issue #13498: Clarify docs of os.makedirs()'s exist_ok argument. Done with + great native-speaker help from R. David Murray. + +- Issue #15533: Clarify docs and add tests for subprocess.Popen()'s cwd + argument. + +- Issue #15979: Improve timeit documentation. + +- Issue #16036: Improve documentation of built-in int()'s signature and + arguments. + +- Issue #15935: Clarification of argparse docs, re: add_argument() type and + default arguments. Patch contributed by Chris Jerdonek. + +- Issue #11964: Document a change in v3.2 to the behavior of the indent + parameter of json encoding operations. + +- Issue #14674: Add a discussion of the json module's standard compliance. + Patch by Chris Rebert. + +- Issue #15630: Add an example for "continue" stmt in the tutorial. Patch by + Daniel Ellis. + +- Issue #15444: Use proper spelling for non-ASCII contributor names. Patch + by Serhiy Storchaka. + +- Issue 15482: Properly document the default 'level' value for __import__() + while warning about using negative values. + +- Issue #15230: Clearly document some of the limitations of the runpy + module and nudge readers towards importlib when appropriate. + +- Issue #13557: Clarify effect of giving two different namespaces to exec or + execfile(). + +- Issue #8799: Fix and improve the threading.Condition documentation. + +- Issue #14943: Correct a default argument value for winreg.OpenKey + and correctly list the argument names in the function's explanation. + +- Issue #14034: added the argparse tutorial. + +- Issue #15250: Document that filecmp.dircmp compares files shallowly. Patch + contributed by Chris Jerdonek. + +Tools/Demos +----------- + +- Issue #15378: Fix Tools/unicode/comparecodecs.py. Patch by Serhiy Storchaka. + +- Issue #14695: Fix missing support for starred assignments in + Tools/parser/unparse.py. + + +What's New in Python 3.2.3? +=========================== + +*Release date: 10-Apr-2012* + +Build +----- + +- Issue #14387: Work around a problem building extension modules under Windows + by undefining ``small`` before use in the Python headers. + + +What's New in Python 3.2.3 release candidate 2? +=============================================== + +*Release date: 18-Mar-2012* + +Library +------- + +- Issue #6884: Fix long-standing bugs with MANIFEST.in parsing in distutils + on Windows. + +Extension Modules +----------------- + +- Issue #14234: CVE-2012-0876: Randomize hashes of xml attributes in the hash + table internal to the pyexpat module's copy of the expat library to avoid a + denial of service due to hash collisions. Patch by David Malcolm with some + modifications by the expat project. + + +What's New in Python 3.2.3 release candidate 1? +=============================================== + +*Release date: 24-Feb-2012* + +Core and Builtins +----------------- + +- Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED + environment variable, to provide an opt-in way to protect against denial of + service attacks due to hash collisions within the dict and set types. Patch + by David Malcolm, based on work by Victor Stinner. + +- Issue #14084: Fix a file descriptor leak when importing a module with a + bad encoding. + +- Issue #13020: Fix a reference leak when allocating a structsequence object + fails. Patch by Suman Saha. + +- Issue #13908: Ready types returned from PyType_FromSpec. + +- Issue #11235: Fix OverflowError when trying to import a source file whose + modification time doesn't fit in a 32-bit timestamp. + +- Fix the builtin module initialization code to store the init function for + future reinitialization. + +- Issue #8052: The posix subprocess module would take a long time closing + all possible file descriptors in the child process rather than just open + file descriptors. It now closes only the open fds if possible for the + default close_fds=True behavior. + +- Issue #13629: Renumber the tokens in token.h so that they match the indexes + into _PyParser_TokenNames. + +- Fix the fix for issue #12149: it was incorrect, although it had the side + effect of appearing to resolve the issue. Thanks to Mark Shannon for + noticing. + +- Issue #13505: Pickle bytes objects in a way that is compatible with + Python 2 when using protocols <= 2. + +- Issue #11147: Fix an unused argument in _Py_ANNOTATE_MEMORY_ORDER. (Fix + given by Campbell Barton). + +- Issue #7111: Python can now be run without a stdin, stdout or stderr + stream. It was already the case with Python 2. However, the corresponding + sys module entries are now set to None (instead of an unusable file object). + +- Issue #13436: Fix a bogus error message when an AST object was passed + an invalid integer value. + +- Issue #13338: Handle all enumerations in _Py_ANNOTATE_MEMORY_ORDER + to allow compiling extension modules with -Wswitch-enum on gcc. + Initial patch by Floris Bruynooghe. + +- Issue #13333: The UTF-7 decoder now accepts lone surrogates (the encoder + already accepts them). + +- Issue #13342: input() used to ignore sys.stdin's and sys.stdout's unicode + error handler in interactive mode (when calling into PyOS_Readline()). + +- Issue #13343: Fix a SystemError when a lambda expression uses a global + variable in the default value of a keyword-only argument: + (lambda *, arg=GLOBAL_NAME: None) + +- Issue #10519: Avoid unnecessary recursive function calls in + setobject.c. + +- Issue #10363: Deallocate global locks in Py_Finalize(). + +- Issue #13018: Fix reference leaks in error paths in dictobject.c. + Patch by Suman Saha. + +- Issue #1294232: In a few cases involving metaclass inheritance, the + interpreter would sometimes invoke the wrong metaclass when building a new + class object. These cases now behave correctly. Patch by Daniel Urban. + +- Issue #12604: VTRACE macro expanded to no-op in _sre.c to avoid compiler + warnings. Patch by Josh Triplett and Petri Lehtinen. + +- Issue #13188: When called without an explicit traceback argument, + generator.throw() now gets the traceback from the passed exception's + ``__traceback__`` attribute. Patch by Petri Lehtinen. + +- Issue #7833: Extension modules built using distutils on Windows will no + longer include a "manifest" to prevent them failing at import time in some + embedded situations. + +- Issue #13063: the Windows error ERROR_NO_DATA (numbered 232 and described + as "The pipe is being closed") is now mapped to POSIX errno EPIPE + (previously EINVAL). + +- Issue #12911: Fix memory consumption when calculating the repr() of huge + tuples or lists. + +- Issue #7732: Don't open a directory as a file anymore while importing a + module. Ignore the direcotry if its name matchs the module name (e.g. + "__init__.py") and raise a ImportError instead. + +- Issue #13021: Missing decref on an error path. Thanks to Suman Saha for + finding the bug and providing a patch. + +- Issue #12973: Fix overflow checks that relied on undefined behaviour in + list_repeat (listobject.c) and islice_next (itertoolsmodule.c). These bugs + caused test failures with recent versions of Clang. + +- Issue #12802: the Windows error ERROR_DIRECTORY (numbered 267) is now + mapped to POSIX errno ENOTDIR (previously EINVAL). + +- Issue #9200: The str.is* methods now work with strings that contain non-BMP + characters even in narrow Unicode builds. + +- Issue #12791: Break reference cycles early when a generator exits with + an exception. + +- Issue #12266: Fix str.capitalize() to correctly uppercase/lowercase + titlecased and cased non-letter characters. + +Library +------- + +- HTMLParser is now able to handle slashes in the start tag. + +- Issue #13641: Decoding functions in the base64 module now accept ASCII-only + unicode strings. Patch by Catalin Iacob. + +- Issue #14043: Speed up importlib's _FileFinder by at least 8x, and add a + new importlib.invalidate_caches() function. + +- Issue #14001: CVE-2012-0845: xmlrpc: Fix an endless loop in + SimpleXMLRPCServer upon malformed POST request. + +- Issue #13961: Move importlib over to using os.replace() for atomic renaming. + +- Do away with ambiguous level values (as suggested by PEP 328) in + importlib.__import__() by raising ValueError when level < 0. + +- Issue #2489: pty.spawn could consume 100% cpu when it encountered an EOF. + +- Issue #13014: Fix a possible reference leak in SSLSocket.getpeercert(). + +- Issue #13777: Add PF_SYSTEM sockets on OS X. + Patch by Michael Goderbauer. + +- Issue #13015: Fix a possible reference leak in defaultdict.__repr__. + Patch by Suman Saha. + +- Issue #1326113: distutils' and packaging's build_ext commands option now + correctly parses multiple values (separated by whitespace or commas) given + to their --libraries option. + +- Issue #10287: nntplib now queries the server's CAPABILITIES first before + sending MODE READER, and only sends it if not already in READER mode. + Patch by Hynek Schlawack. + +- Issue #13993: HTMLParser is now able to handle broken end tags when + strict=False. + +- Issue #13930: lib2to3 now supports writing converted output files to another + directory tree as well as copying unchanged files and altering the file + suffix. + +- Issue #9750: Fix sqlite3.Connection.iterdump on tables and fields + with a name that is a keyword or contains quotes. Patch by Marko + Kohtala. + +- Issue #10287: nntplib now queries the server's CAPABILITIES again after + authenticating (since the result may change, according to RFC 4643). + Patch by Hynek Schlawack. + +- Issue #13989: Document that GzipFile does not support text mode, and give a + more helpful error message when opened with an invalid mode string. + +- Issue #13590: On OS X 10.7 and 10.6 with Xcode 4.2, building + Distutils-based packages with C extension modules may fail because + Apple has removed gcc-4.2, the version used to build python.org + 64-bit/32-bit Pythons. If the user does not explicitly override + the default C compiler by setting the CC environment variable, + Distutils will now attempt to compile extension modules with clang + if gcc-4.2 is required but not found. Also as a convenience, if + the user does explicitly set CC, substitute its value as the default + compiler in the Distutils LDSHARED configuration variable for OS X. + (Note, the python.org 32-bit-only Pythons use gcc-4.0 and the 10.4u + SDK, neither of which are available in Xcode 4. This change does not + attempt to override settings to support their use with Xcode 4.) + +- Issue #13960: HTMLParser is now able to handle broken comments when + strict=False. + +- Issue #13921: Undocument and clean up sqlite3.OptimizedUnicode, + which is obsolete in Python 3.x. It's now aliased to str for + backwards compatibility. + +- When '' is a path (e.g. in sys.path), make sure __file__ uses the current + working directory instead of '' in importlib. + +- Issue #13609: Add two functions to query the terminal size: + os.get_terminal_size (low level) and shutil.get_terminal_size (high level). + Patch by Zbigniew Jędrzejewski-Szmek. + +- Issue #13845: On Windows, time.time() now uses GetSystemTimeAsFileTime() + instead of ftime() to have a resolution of 100 ns instead of 1 ms (the clock + accuracy is between 0.5 ms and 15 ms). + +- Issue #13846: Add time.monotonic(), monotonic clock. + +- Issue #8184: multiprocessing: On Windows, don't set SO_REUSEADDR on + Connection sockets, and set FILE_FLAG_FIRST_PIPE_INSTANCE on named pipes, to + make sure two listeners can't bind to the same socket/pipe (or any existing + socket/pipe). + +- Issue #10811: Fix recursive usage of cursors. Instead of crashing, + raise a ProgrammingError now. + +- Issue #10881: Fix test_site failure with OS X framework builds. + +- Issue #964437: Make IDLE help window non-modal. + Patch by Guilherme Polo and Roger Serwy. + +- Issue #13734: Add os.fwalk(), a directory walking function yielding file + descriptors. + +- Issue #2945: Make the distutils upload command aware of bdist_rpm products. + +- Issue #13712: pysetup create should not convert package_data to extra_files. + +- Issue #11805: package_data in setup.cfg should allow more than one value. + +- Issue #13933: IDLE auto-complete did not work with some imported + module, like hashlib. (Patch by Roger Serwy) + +- Issue #13901: Prevent test_distutils failures on OS X with --enable-shared. + +- Issue #13676: Handle strings with embedded zeros correctly in sqlite3. + +- Issue #13506: Add '' to path for IDLE Shell when started and restarted with Restart Shell. + Original patches by Marco Scataglini and Roger Serwy. + +- Issue #8828: Add new function os.replace(), for cross-platform renaming + with overwriting. + +- Issue #13848: open() and the FileIO constructor now check for NUL + characters in the file name. Patch by Hynek Schlawack. + +- Issue #13806: The size check in audioop decompression functions was too + strict and could reject valid compressed data. Patch by Oleg Plakhotnyuk. + +- Issue #13812: When a multiprocessing Process child raises an exception, + flush stderr after printing the exception traceback. + +- Issue #13885: CVE-2011-3389: the _ssl module would always disable the CBC + IV attack countermeasure. + +- Issue #13847: time.localtime() and time.gmtime() now raise an OSError instead + of ValueError on failure. time.ctime() and time.asctime() now raises an + OSError if localtime() failed. time.clock() now raises a RuntimeError if the + processor time used is not available or its value cannot be represented + +- Issue #13862: Fix spurious failure in test_zlib due to runtime/compile time + minor versions not matching. + +- Issue #12804: Fix test_socket and test_urllib2net failures when running tests + on a system without internet access. + +- Issue #13772: In os.symlink() under Windows, do not try to guess the link + target's type (file or directory). The detection was buggy and made the + call non-atomic (therefore prone to race conditions). + +- Issue #6631: Disallow relative file paths in urllib urlopen methods. + +- Issue #13722: Avoid silencing ImportErrors when initializing the codecs + registry. + +- Issue #13781: Fix GzipFile bug that caused an exception to be raised when + opening for writing using a fileobj returned by os.fdopen(). + +- Issue #13803: Under Solaris, distutils doesn't include bitness + in the directory name. + +- Issue #10278: Add time.wallclock() function, monotonic clock. + +- Issue #13809: Fix regression where bz2 module wouldn't work when threads are + disabled. Original patch by Amaury Forgeot d'Arc. + +- Issue #13589: Fix some serialization primitives in the aifc module. + Patch by Oleg Plakhotnyuk. + +- Issue #13642: Unquote before b64encoding user:password during Basic + Authentication. Patch contributed by Joonas Kuorilehto. + +- Issue #13726: Fix the ambiguous -S flag in regrtest. It is -o/--slow for slow + tests. + +- Issue #12364: Fix a hang in concurrent.futures.ProcessPoolExecutor. + The hang would occur when retrieving the result of a scheduled future after + the executor had been shut down. + +- Issue #13502: threading: Fix a race condition in Event.wait() that made it + return False when the event was set and cleared right after. + +- Issue #9993: When the source and destination are on different filesystems, + and the source is a symlink, shutil.move() now recreates a symlink on the + destination instead of copying the file contents. Patch by Jonathan Niehof + and Hynek Schlawack. + +- Issue #12926: Fix a bug in tarfile's link extraction. + +- Issue #13696: Fix the 302 Relative URL Redirection problem. + +- Issue #13636: Weak ciphers are now disabled by default in the ssl module + (except when SSLv2 is explicitly asked for). + +- Issue #12715: Add an optional symlinks argument to shutil functions + (copyfile, copymode, copystat, copy, copy2). When that parameter is + true, symlinks aren't dereferenced and the operation instead acts on the + symlink itself (or creates one, if relevant). Patch by Hynek Schlawack. + +- Add a flags parameter to select.epoll. + +- Issue #13626: Add support for SSL Diffie-Hellman key exchange, through the + SSLContext.load_dh_params() method and the ssl.OP_SINGLE_DH_USE option. + +- Issue #11006: Don't issue low level warning in subprocess when pipe2() fails. + +- Issue #13620: Support for Chrome browser in webbrowser. Patch contributed + by Arnaud Calmettes. + +- Issue #11829: Fix code execution holes in inspect.getattr_static for + metaclasses with metaclasses. Patch by Andreas Stührk. + +- Issue #12708: Add starmap() and starmap_async() methods (similar to + itertools.starmap()) to multiprocessing.Pool. Patch by Hynek Schlawack. + +- Issue #1785: Fix inspect and pydoc with misbehaving descriptors. + +- Issue #13637: "a2b" functions in the binascii module now accept ASCII-only + unicode strings. + +- Issue #13634: Add support for querying and disabling SSL compression. + +- Issue #13627: Add support for SSL Elliptic Curve-based Diffie-Hellman + key exchange, through the SSLContext.set_ecdh_curve() method and the + ssl.OP_SINGLE_ECDH_USE option. + +- Issue #13635: Add ssl.OP_CIPHER_SERVER_PREFERENCE, so that SSL servers + choose the cipher based on their own preferences, rather than on the + client's. + +- Issue #11813: Fix inspect.getattr_static for modules. Patch by Andreas + Stührk. + +- Issue #7502: Fix equality comparison for DocTestCase instances. Patch by + Cédric Krier. + +- Issue #11870: threading: Properly reinitialize threads internal locks and + condition variables to avoid deadlocks in child processes. + +- Issue #8035: urllib: Fix a bug where the client could remain stuck after a + redirection or an error. + +- Issue #13560: os.strerror() now uses the current locale encoding instead of + UTF-8. + +- Issue #8373: The filesystem path of AF_UNIX sockets now uses the filesystem + encoding and the surrogateescape error handler, rather than UTF-8. Patch + by David Watson. + +- Issue #10350: Read and save errno before calling a function which might + overwrite it. Original patch by Hallvard B Furuseth. + +- Issue #11610: Introduce a more general way to declare abstract properties. + +- Issue #13591: A bug in importlib has been fixed that caused import_module + to load a module twice. + +- Issue #4625: If IDLE cannot write to its recent file or breakpoint files, + display a message popup and continue rather than crash. Original patch by + Roger Serwy. + +- Issue #13449 sched.scheduler.run() method has a new "blocking" parameter which + when set to False makes run() execute the scheduled events due to expire + soonest (if any) and then return. Patch by Giampaolo Rodolà. + +- Issue #8684 sched.scheduler class can be safely used in multi-threaded + environments. Patch by Josiah Carlson and Giampaolo Rodolà. + +- Alias resource.error to OSError ala PEP 3151. + +- Issue #5689: Add support for lzma compression to the tarfile module. + +- Issue #13248: Turn 3.2's PendingDeprecationWarning into 3.3's + DeprecationWarning. It covers 'cgi.escape', 'importlib.abc.PyLoader', + 'importlib.abc.PyPycLoader', 'nntplib.NNTP.xgtitle', 'nntplib.NNTP.xpath', + and private attributes of 'smtpd.SMTPChannel'. + +- Issue #5905, #13560: time.strftime() is now using the current locale + encoding, instead of UTF-8, if the wcsftime() function is not available. + +- Issue #8641: Update IDLE 3 syntax coloring to recognize b".." and not u"..". + Patch by Tal Einat. + +- Issue #13464: Add a readinto() method to http.client.HTTPResponse. Patch + by Jon Kuhn. + +- tarfile.py: Correctly detect bzip2 compressed streams with blocksizes + other than 900k. + +- Issue #13439: Fix many errors in turtle docstrings. + +- Issue #6715: Add a module 'lzma' for compression using the LZMA algorithm. + Thanks to Per Øyvind Karlsen for the initial implementation. + +- Issue #13487: Make inspect.getmodule robust against changes done to + sys.modules while it is iterating over it. + +- Issue #12618: Fix a bug that prevented py_compile from creating byte + compiled files in the current directory. Initial patch by Sjoerd de Vries. + +- Issue #13444: When stdout has been closed explicitly, we should not attempt + to flush it at shutdown and print an error. + +- Issue #12567: The curses module uses Unicode functions for Unicode arguments + when it is linked to the ncurses library. It encodes also Unicode strings to + the locale encoding instead of UTF-8. + +- Issue #12856: Ensure child processes do not inherit the parent's random + seed for filename generation in the tempfile module. Patch by Brian + Harring. + +- Issue #9957: SpooledTemporaryFile.truncate() now accepts an optional size + parameter, as other file-like objects. Patch by Ryan Kelly. + +- Issue #13458: Fix a memory leak in the ssl module when decoding a + certificate with a subjectAltName. Patch by Robert Xiao. + +- Issue #13415: os.unsetenv() doesn't ignore errors anymore. + +- Issue #13245: sched.scheduler class constructor's timefunc and + delayfunct parameters are now optional. + scheduler.enter and scheduler.enterabs methods gained a new kwargs parameter. + Patch contributed by Chris Clark. + +- Issue #12328: Under Windows, refactor handling of Ctrl-C events and + make _multiprocessing.win32.WaitForMultipleObjects interruptible when + the wait_flag parameter is false. Patch by sbt. + +- Issue #13322: Fix BufferedWriter.write() to ensure that BlockingIOError is + raised when the wrapped raw file is non-blocking and the write would block. + Previous code assumed that the raw write() would raise BlockingIOError, but + RawIOBase.write() is defined to returned None when the call would block. + Patch by sbt. + +- Issue #13358: HTMLParser now calls handle_data only once for each CDATA. + +- Issue #4147: minidom's toprettyxml no longer adds whitespace around a text + node when it is the only child of an element. Initial patch by Dan + Kenigsberg. + +- Issue #13374: The Windows bytes API has been deprecated in the os module. Use + Unicode filenames instead of bytes filenames to not depend on the ANSI code + page anymore and to support any filename. + +- Issue #13297: Use bytes type to send and receive binary data through XMLRPC. + +- Issue #6397: Support "/dev/poll" polling objects in select module, + under Solaris & derivatives. + +- Issues #1745761, #755670, #13357, #12629, #1200313: HTMLParser now correctly + handles non-valid attributes, including adjacent and unquoted attributes. + +- Issue #13193: Fix distutils.filelist.FileList and packaging.manifest.Manifest + under Windows. + +- Issue #13384: Remove unnecessary __future__ import in Lib/random.py + +- Issue #13149: Speed up append-only StringIO objects. + +- Issue #13373: multiprocessing.Queue.get() could sometimes block indefinitely + when called with a timeout. Patch by Arnaud Ysmal. + +- Issue #13254: Fix Maildir initialization so that maildir contents + are read correctly. + +- Issue #3067: locale.setlocale() now raises TypeError if the second + argument is an invalid iterable. Its documentation and docstring + were also updated. Initial patch by Jyrki Pulliainen. + +- Issue #13140: Fix the daemon_threads attribute of ThreadingMixIn. + +- Issue #13339: Fix compile error in posixmodule.c due to missing semicolon. + Thanks to Robert Xiao. + +- Byte compilation in packaging is now isolated from the calling Python -B or + -O options, instead of being disallowed under -B or buggy under -O. + +- Issue #10570: curses.putp() and curses.tparm() are now expecting a byte + string, instead of a Unicode string. + +- Issue #13295: http.server now produces valid HTML 4.01 strict. + +- Issue #2892: preserve iterparse events in case of SyntaxError. + +- Issue #13287: urllib.request and urllib.error now contains an __all__ + attribute to expose only relevant classes and functions. Patch by Florent + Xicluna. + +- Issue #670664: Fix HTMLParser to correctly handle the content of + ``<script>...</script>`` and ``<style>...</style>``. + +- Issue #10817: Fix urlretrieve function to raise ContentTooShortError even + when reporthook is None. Patch by Jyrki Pulliainen. + +- Issue #13296: Fix IDLE to clear compile __future__ flags on shell restart. + (Patch by Roger Serwy) + +- Fix the xmlrpc.client user agent to return something similar to + urllib.request user agent: "Python-xmlrpc/3.3". + +- Issue #13293: Better error message when trying to marshal bytes using + xmlrpc.client. + +- Issue #13291: NameError in xmlrpc package. + +- Issue #13258: Use callable() built-in in the standard library. + +- Issue #13273: fix a bug that prevented HTMLParser to properly detect some + tags when strict=False. + +- Issue #11183: Add finer-grained exceptions to the ssl module, so that + you don't have to inspect the exception's attributes in the common case. + +- Issue #13216: Add cp65001 codec, the Windows UTF-8 (CP_UTF8). + +- Issue #13226: Add RTLD_xxx constants to the os module. These constants can be + used with sys.setdlopenflags(). + +- Issue #10278: Add clock_getres(), clock_gettime() and CLOCK_xxx constants to + the time module. time.clock_gettime(time.CLOCK_MONOTONIC) provides a + monotonic clock + +- Issue #10332: multiprocessing: fix a race condition when a Pool is closed + before all tasks have completed. + +- Issue #13255: wrong docstrings in array module. + +- Issue #8540: Remove deprecated Context._clamp attribute in Decimal module. + +- Issue #13235: Added DeprecationWarning to logging.warn() method and function. + +- Issue #9168: now smtpd is able to bind privileged port. + +- Issue #12529: fix cgi.parse_header issue on strings with double-quotes and + semicolons together. Patch by Ben Darnell and Petri Lehtinen. + +- Issue #13227: functools.lru_cache() now has a option to distinguish + calls with different argument types. + +- Issue #6090: zipfile raises a ValueError when a document with a timestamp + earlier than 1980 is provided. Patch contributed by Petri Lehtinen. + +- Issue #13150: sysconfig no longer parses the Makefile and config.h files + when imported, instead doing it at build time. This makes importing + sysconfig faster and reduces Python startup time by 20%. + +- Issue #12448: smtplib now flushes stdout while running ``python -m smtplib`` + in order to display the prompt correctly. + +- Issue #12454: The mailbox module is now using ASCII, instead of the locale + encoding, to read and write .mh_sequences files. + +- Issue #13194: zlib.compressobj().copy() and zlib.decompressobj().copy() are + now available on Windows. + +- Issue #1673007: urllib.request now supports HEAD request via new method argument. + Patch contributions by David Stanek, Patrick Westerhoff and Ezio Melotti. + +- Issue #12386: packaging does not fail anymore when writing the RESOURCES + file. + +- Issue #13158: Fix decoding and encoding of GNU tar specific base-256 number + fields in tarfile. + +- Issue #13025: mimetypes is now reading MIME types using the UTF-8 encoding, + instead of the locale encoding. + +- Issue #10653: On Windows, use strftime() instead of wcsftime() because + wcsftime() doesn't format time zone correctly. + +- Issue #13150: The tokenize module doesn't compile large regular expressions + at startup anymore. + +- Issue #11171: Fix distutils.sysconfig.get_makefile_filename when Python was + configured with different prefix and exec-prefix. + +- Issue #11254: Teach distutils and packaging to compile .pyc and .pyo files in + PEP 3147-compliant __pycache__ directories. + +- Issue #7367: Fix pkgutil.walk_paths to skip directories whose + contents cannot be read. + +- Issue #3163: The struct module gets new format characters 'n' and 'N' + supporting C integer types ``ssize_t`` and ``size_t``, respectively. + +- Issue #13099: Fix sqlite3.Cursor.lastrowid under a Turkish locale. + Reported and diagnosed by Thomas Kluyver. + +- Issue #13087: BufferedReader.seek() now always raises UnsupportedOperation + if the underlying raw stream is unseekable, even if the seek could be + satisfied using the internal buffer. Patch by John O'Connor. + +- Issue #7689: Allow pickling of dynamically created classes when their + metaclass is registered with copyreg. Patch by Nicolas M. Thiéry and Craig + Citro. + +- Issue #13034: When decoding some SSL certificates, the subjectAltName + extension could be unreported. + +- Issue #9871: Prevent IDLE 3 crash when given byte stings + with invalid hex escape sequences, like b'\x0'. + (Original patch by Claudiu Popa.) + +- Issue #12306: Expose the runtime version of the zlib C library as a constant, + ZLIB_RUNTIME_VERSION, in the zlib module. Patch by Torsten Landschoff. + +- Issue #12959: Add collections.ChainMap to collections.__all__. + +- Issue #8933: distutils' PKG-INFO files and packaging's METADATA files will + now correctly report Metadata-Version: 1.1 instead of 1.0 if a Classifier or + Download-URL field is present. + +- Issue #12567: Add curses.unget_wch() function. Push a character so the next + get_wch() will return it. + +- Issue #9561: distutils and packaging now writes egg-info files using UTF-8, + instead of the locale encoding. + +- Issue #8286: The distutils command sdist will print a warning message instead + of crashing when an invalid path is given in the manifest template. + +- Issue #12841: tarfile unnecessarily checked the existence of numerical user + and group ids on extraction. If one of them did not exist the respective id + of the current user (i.e. root) was used for the file and ownership + information was lost. + +- Issue #12888: Fix a bug in HTMLParser.unescape that prevented it to escape + more than 128 entities. Patch by Peter Otten. + +- Issue #12878: Expose a __dict__ attribute on io.IOBase and its subclasses. + +- Issue #12636: IDLE reads the coding cookie when executing a Python script. + +- Issue #12494: On error, call(), check_call(), check_output() and + getstatusoutput() functions of the subprocess module now kill the process, + read its status (to avoid zombis) and close pipes. + +- Issue #12720: Expose low-level Linux extended file attribute functions in os. + +- Issue #10946: The distutils commands bdist_dumb, bdist_wininst and bdist_msi + now respect a --skip-build option given to bdist. The packaging commands + were fixed too. + +- Issue #12847: Fix a crash with negative PUT and LONG_BINPUT arguments in + the C pickle implementation. + +- Issue #11564: Avoid crashes when trying to pickle huge objects or containers + (more than 2**31 items). Instead, in most cases, an OverflowError is raised. + +- Issue #12287: Fix a stack corruption in ossaudiodev module when the FD is + greater than FD_SETSIZE. + +- Issue #12839: Fix crash in zlib module due to version mismatch. + Fix by Richard M. Tew. + +- Issue #9923: The mailcap module now correctly uses the platform path + separator for the MAILCAP environment variable on non-POSIX platforms. + +- Issue #12835: Follow up to #6560 that unconditionally prevents use of the + unencrypted sendmsg/recvmsg APIs on SSL wrapped sockets. Patch by David + Watson. + +- Issue #12803: SSLContext.load_cert_chain() now accepts a password argument + to be used if the private key is encrypted. Patch by Adam Simpkins. + +- Issue #11657: Fix sending file descriptors over 255 over a multiprocessing + Pipe. + +- Issue #12811: tabnanny.check() now promptly closes checked files. Patch by + Anthony Briggs. + +- Issue #6560: The sendmsg/recvmsg API is now exposed by the socket module + when provided by the underlying platform, supporting processing of + ancillary data in pure Python code. Patch by David Watson and Heiko Wundram. + +- Issue #12326: On Linux, sys.platform doesn't contain the major version + anymore. It is now always 'linux', instead of 'linux2' or 'linux3' depending + on the Linux version used to build Python. + +- Issue #12213: Fix a buffering bug with interleaved reads and writes that + could appear on BufferedRandom streams. + +- Issue #12778: Reduce memory consumption when JSON-encoding a large + container of many small objects. + +- Issue #12650: Fix a race condition where a subprocess.Popen could leak + resources (FD/zombie) when killed at the wrong time. + +- Issue #12744: Fix inefficient representation of integers between 2**31 and + 2**63 on systems with a 64-bit C "long". + +- Issue #12646: Add an 'eof' attribute to zlib.Decompress, to make it easier to + detect truncated input streams. + +- Issue #11513: Fix exception handling ``tarfile.TarFile.gzopen()`` when + the file cannot be opened. + +- Issue #12687: Fix a possible buffering bug when unpickling text mode + (protocol 0, mostly) pickles. + +- Issue #10087: Fix the html output format of the calendar module. + +- Issue #12540: Prevent zombie IDLE processes on Windows due to changes + in os.kill(). + +- Issue #13121: add support for inplace math operators to collections.Counter. + +- Add support for unary plus and unary minus to collections.Counter. + +- Issue #12683: urlparse updated to include svn as schemes that uses relative + paths. (svn from 1.5 onwards support relative path). + +- Issue #12655: Expose functions from sched.h in the os module: sched_yield(), + sched_setscheduler(), sched_getscheduler(), sched_setparam(), + sched_get_min_priority(), sched_get_max_priority(), sched_rr_get_interval(), + sched_getaffinity(), sched_setaffinity(). + +- Add ThreadError to threading.__all__. + +- Issues #11104, #8688: Fix the behavior of distutils' sdist command with + manually-maintained MANIFEST files. + +- Issue #11281: smtplib.STMP gets source_address parameter, which adds the + ability to bind to specific source address on a machine with multiple + interfaces. Patch by Paulo Scardine. + +- Issue #12464: tempfile.TemporaryDirectory.cleanup() should not follow + symlinks: fix it. Patch by Petri Lehtinen. + +- Issue #8887: "pydoc somebuiltin.somemethod" (or help('somebuiltin.somemethod') + in Python code) now finds the doc of the method. + +- Issue #10968: Remove indirection in threading. The public names (Event, + Condition, etc.) used to be factory functions returning instances of hidden + classes (_Event, _Condition, etc.), because (if Guido recalls correctly) this + code pre-dates the ability to subclass extension types. It is now possible + to inherit from these classes, without having to import the private + underscored names like multiprocessing did. + +- Issue #9723: Add shlex.quote functions, to escape filenames and command + lines. + +- Issue #12603: Fix pydoc.synopsis() on files with non-negative st_mtime. + +- Issue #12514: Use try/finally to assure the timeit module restores garbage + collections when it is done. + +- Issue #12607: In subprocess, fix issue where if stdin, stdout or stderr is + given as a low fd, it gets overwritten. + +- Issue #12590: IDLE editor window now always displays the first line + when opening a long file. With Tk 8.5, the first line was hidden. + +- Issue #12576: Fix urlopen behavior on sites which do not send (or obfuscates) + Connection:close header. + +- Issue #12102: Document that buffered files must be flushed before being used + with mmap. Patch by Steffen Daode Nurpmeso. + +- Issue #12560: Build libpython.so on OpenBSD. Patch by Stefan Sperling. + +- Issue #1813: Fix codec lookup under Turkish locales. + +- Issue #12591: Improve support of "universal newlines" in the subprocess + module: the piped streams can now be properly read from or written to. + +- Issue #12591: Allow io.TextIOWrapper to work with raw IO objects (without + a read1() method), and add a *write_through* parameter to mandate + unbuffered writes. + +- Issue #10883: Fix socket leaks in urllib.request when using FTP. + +- Issue #12592: Make Python build on OpenBSD 5 (and future major releases). + +- Issue #12372: POSIX semaphores are broken on AIX: don't use them. + +- Issue #12551: Provide a get_channel_binding() method on SSL sockets so as + to get channel binding data for the current SSL session (only the + "tls-unique" channel binding is implemented). This allows the implementation + of certain authentication mechanisms such as SCRAM-SHA-1-PLUS. Patch by + Jacek Konieczny. + +- Issue #665194: email.utils now has format_datetime and parsedate_to_datetime + functions, allowing for round tripping of RFC2822 format dates. + +- Issue #12571: Add a plat-linux3 directory mirroring the plat-linux2 + directory, so that "import DLFCN" and other similar imports work on + Linux 3.0. + +- Issue #7484: smtplib no longer puts <> around addresses in VRFY and EXPN + commands; they aren't required and in fact postfix doesn't support that form. + +- Issue #12273: Remove ast.__version__. AST changes can be accounted for by + checking sys.version_info or sys._mercurial. + +- Silence spurious "broken pipe" tracebacks when shutting down a + ProcessPoolExecutor. + +- Fix potential resource leaks in concurrent.futures.ProcessPoolExecutor + by joining all queues and processes when shutdown() is called. + +- Issue #11603: Fix a crash when __str__ is rebound as __repr__. Patch by + Andreas Stührk. + +- Issue #11321: Fix a crash with multiple imports of the _pickle module when + embedding Python. Patch by Andreas Stührk. + +- Issue #6755: Add get_wch() method to curses.window class. Patch by Iñigo + Serna. + +- Add cgi.closelog() function to close the log file. + +- Issue #12502: asyncore: fix polling loop with AF_UNIX sockets. + +- Issue #4376: ctypes now supports nested structures in a endian different than + the parent structure. Patch by Vlad Riscutia. + +- Raise ValueError when attempting to set the _CHUNK_SIZE attribute of a + TextIOWrapper to a huge value, not TypeError. + +- Issue #12504: Close file handles in a timely manner in packaging.database. + This fixes a bug with the remove (uninstall) feature on Windows. + +- Issues #12169 and #10510: Factor out code used by various packaging commands + to make HTTP POST requests, and make sure it uses CRLF. + +- Issue #12016: Multibyte CJK decoders now resynchronize faster. They only + ignore the first byte of an invalid byte sequence. For example, + b'\xff\n'.decode('gb2312', 'replace') gives '\ufffd\n' instead of '\ufffd'. + +- Issue #12459: time.sleep() now raises a ValueError if the sleep length is + negative, instead of an infinite sleep on Windows or raising an IOError on + Linux for example, to have the same behaviour on all platforms. + +- Issue #12451: pydoc: html_getfile() now uses tokenize.open() to support + Python scripts using a encoding different than UTF-8 (read the coding cookie + of the script). + +- Issue #12493: subprocess: Popen.communicate() now also handles EINTR errors + if the process has only one pipe. + +- Issue #12467: warnings: fix a race condition if a warning is emitted at + shutdown, if globals()['__file__'] is None. + +- Issue #12451: pydoc: importfile() now opens the Python script in binary mode, + instead of text mode using the locale encoding, to avoid encoding issues. + +- Issue #12451: runpy: run_path() now opens the Python script in binary mode, + instead of text mode using the locale encoding, to support other encodings + than UTF-8 (scripts using the coding cookie). + +- Issue #12451: xml.dom.pulldom: parse() now opens files in binary mode instead + of the text mode (using the locale encoding) to avoid encoding issues. + +- Issue #12147: Adjust the new-in-3.2 smtplib.send_message method for better + conformance to the RFCs: correctly handle Sender and Resent- headers. + +- Issue #12352: Fix a deadlock in multiprocessing.Heap when a block is freed by + the garbage collector while the Heap lock is held. + +- Issue #12462: time.sleep() now immediately calls the (Python) signal handler + if it is interrupted by a signal, instead of having to wait until the next + instruction. + +- Issue #12442: new shutil.disk_usage function, providing total, used and free + disk space statistics. + +- Issue #12451: The XInclude default loader of xml.etree now decodes files from + UTF-8 instead of the locale encoding if the encoding is not specified. It now + also opens XML files for the parser in binary mode instead of the text mode + to avoid encoding issues. + +- Issue #12451: doctest.debug_script() doesn't create a temporary file + anymore to avoid encoding issues. + +- Issue #12451: pydoc.synopsis() now reads the encoding cookie if available, + to read the Python script from the right encoding. + +- Issue #12451: distutils now opens the setup script in binary mode to read the + encoding cookie, instead of opening it in UTF-8. + +- Issue #9516: On Mac OS X, change Distutils to no longer globally attempt to + check or set the MACOSX_DEPLOYMENT_TARGET environment variable for the + interpreter process. This could cause failures in non-Distutils subprocesses + and was unreliable since tests or user programs could modify the interpreter + environment after Distutils set it. Instead, have Distutils set the the + deployment target only in the environment of each build subprocess. It is + still possible to globally override the default by setting + MACOSX_DEPLOYMENT_TARGET before launching the interpreter; its value must be + greater or equal to the default value, the value with which the interpreter + was built. Also, implement the same handling in packaging. + +- Issue #12422: In the copy module, don't store objects that are their own copy + in the memo dict. + +- Issue #12303: Add sigwaitinfo() and sigtimedwait() to the signal module. + +- Issue #12404: Remove C89 incompatible code from mmap module. Patch by Akira + Kitada. + +- Issue #1874: email now detects and reports as a defect the presence of + any CTE other than 7bit, 8bit, or binary on a multipart. + +- Issue #12383: Fix subprocess module with env={}: don't copy the environment + variables, start with an empty environment. + +- Issue #11637: Fix support for importing packaging setup hooks from the + project directory. + +- Issue #6771: Moved the curses.wrapper function from the single-function + wrapper module into __init__, eliminating the module. Since __init__ was + already importing the function to curses.wrapper, there is no API change. + +- Issue #11584: email.header.decode_header no longer fails if the header + passed to it is a Header object, and Header/make_header no longer fail + if given binary unknown-8bit input. + +- Issue #11700: mailbox proxy object close methods can now be called multiple + times without error. + +- Issue #11767: Correct file descriptor leak in mailbox's __getitem__ method. + +- Issue #12133: AbstractHTTPHandler.do_open() of urllib.request closes the HTTP + connection if its getresponse() method fails with a socket error. Patch + written by Ezio Melotti. + +- Issue #12240: Allow multiple setup hooks in packaging's setup.cfg files. + Original patch by Erik Bray. + +- Issue #9284: Allow inspect.findsource() to find the source of doctest + functions. + +- Issue #11595: Fix assorted bugs in packaging.util.cfg_to_args, a + compatibility helper for the distutils-packaging transition. Original patch + by Erik Bray. + +- Issue #12287: In ossaudiodev, check that the device isn't closed in several + methods. + +- Issue #12009: Fixed regression in netrc file comment handling. + +- Issue #12246: Warn and fail when trying to install a third-party project from + an uninstalled Python (built in a source checkout). Original patch by + Tshepang Lekhonkhobe. + +- Issue #10694: zipfile now ignores garbage at the end of a zipfile. + +- Issue #12283: Fixed regression in smtplib quoting of leading dots in DATA. + +- Issue #10424: Argparse now includes the names of the missing required + arguments in the missing arguments error message. + +- Issue #12168: SysLogHandler now allows NUL termination to be controlled using + a new 'append_nul' attribute on the handler. + +- Issue #11583: Speed up os.path.isdir on Windows by using GetFileAttributes + instead of os.stat. + +- Issue #12021: Make mmap's read() method argument optional. Patch by Petri + Lehtinen. + +- Issue #9205: concurrent.futures.ProcessPoolExecutor now detects killed + children and raises BrokenProcessPool in such a situation. Previously it + would reliably freeze/deadlock. + +- Issue #12040: Expose a new attribute ``sentinel`` on instances of + ``multiprocessing.Process``. Also, fix Process.join() to not use polling + anymore, when given a timeout. + +- Issue #11893: Remove obsolete internal wrapper class ``SSLFakeFile`` in the + smtplib module. Patch by Catalin Iacob. + +- Issue #12080: Fix a Decimal.power() case that took an unreasonably long time + to compute. + +- Issue #12221: Remove __version__ attributes from pyexpat, pickle, tarfile, + pydoc, tkinter, and xml.parsers.expat. This were useless version constants + left over from the Mercurial transition + +- Named tuples now work correctly with vars(). + +- Issue #12085: Fix an attribute error in subprocess.Popen destructor if the + constructor has failed, e.g. because of an undeclared keyword argument. Patch + written by Oleg Oshmyan. + +- Issue #12028: Make threading._get_ident() public, rename it to + threading.get_ident() and document it. This function was already used using + _thread.get_ident(). + +- Issue #12171: IncrementalEncoder.reset() of CJK codecs (multibytecodec) calls + encreset() instead of decreset(). + +- Issue #12218: Removed wsgiref.egg-info. + +- Issue #12196: Add pipe2() to the os module. + +- Issue #985064: Make plistlib more resilient to faulty input plists. + Patch by Mher Movsisyan. + +- Issue #1625: BZ2File and bz2.decompress() now support multi-stream files. + Initial patch by Nir Aides. + +- Issue #12175: BufferedReader.read(-1) now calls raw.readall() if available. + +- Issue #12175: FileIO.readall() now only reads the file position and size + once. + +- Issue #12175: RawIOBase.readall() now returns None if read() returns None. + +- Issue #12175: FileIO.readall() now raises a ValueError instead of an IOError + if the file is closed. + +- Issue #11109: New service_action method for BaseServer, used by ForkingMixin + class for cleanup. Initial Patch by Justin Warkentin. + +- Issue #12045: Avoid duplicate execution of command in + ctypes.util._get_soname(). Patch by Sijin Joseph. + +- Issue #10818: Remove the Tk GUI and the serve() function of the pydoc module, + pydoc -g has been deprecated in Python 3.2 and it has a new enhanced web + server. + +- Issue #1441530: In imaplib, read the data in one chunk to speed up large + reads and simplify code. + +- Issue #12070: Fix the Makefile parser of the sysconfig module to handle + correctly references to "bogus variable" (e.g. "prefix=$/opt/python"). + +- Issue #12100: Don't reset incremental encoders of CJK codecs at each call to + their encode() method anymore, but continue to call the reset() method if the + final argument is True. + +- Issue #12049: Add RAND_bytes() and RAND_pseudo_bytes() functions to the ssl + module. + +- Issue #6501: os.device_encoding() returns None on Windows if the application + has no console. + +- Issue #12105: Add O_CLOEXEC to the os module. + +- Issue #12079: Decimal('Infinity').fma(Decimal('0'), (3.91224318126786e+19+0j)) + now raises TypeError (reflecting the invalid type of the 3rd argument) rather + than Decimal.InvalidOperation. + +- Issue #12124: zipimport doesn't keep a reference to zlib.decompress() anymore + to be able to unload the module. + +- Add the packaging module, an improved fork of distutils (also known as + distutils2). + +- Issue #12065: connect_ex() on an SSL socket now returns the original errno + when the socket's timeout expires (it used to return None). + +- Issue #8809: The SMTP_SSL constructor and SMTP.starttls() now support + passing a ``context`` argument pointing to an ssl.SSLContext instance. + Patch by Kasun Herath. + +- Issue #11088: don't crash when using F5 to run a script in IDLE on MacOSX + with Tk 8.5. + +- Issue #9516: Issue #9516: avoid errors in sysconfig when MACOSX_DEPLOYMENT_TARGET + is set in shell. + +- Issue #8650: Make zlib module 64-bit clean. compress(), decompress() and + their incremental counterparts now raise OverflowError if given an input + larger than 4GB, instead of silently truncating the input and returning + an incorrect result. + +- Issue #12050: zlib.decompressobj().decompress() now clears the unconsumed_tail + attribute when called without a max_length argument. + +- Issue #12062: Fix a flushing bug when doing a certain type of I/O sequence + on a file opened in read+write mode (namely: reading, seeking a bit forward, + writing, then seeking before the previous write but still within buffered + data, and writing again). + +- Issue #9971: Write an optimized implementation of BufferedReader.readinto(). + Patch by John O'Connor. + +- Issue #1028: Tk returns invalid Unicode null in %A: UnicodeDecodeError. + With Tk < 8.5 _tkinter.c:PythonCmd() raised UnicodeDecodeError, caused + IDLE to exit. Converted to valid Unicode null in PythonCmd(). + +- Issue #11799: urllib.request Authentication Handlers will raise a ValueError + when presented with an unsupported Authentication Scheme. Patch contributed + by Yuval Greenfield. + +- Issue #10419, #6011: build_scripts command of distutils handles correctly + non-ASCII path (path to the Python executable). Open and write the script in + binary mode, but ensure that the shebang is decodable from UTF-8 and from the + encoding of the script. + +- Issue #8498: In socket.accept(), allow to specify 0 as a backlog value in + order to accept exactly one connection. Patch by Daniel Evers. + +- Issue #12011: signal.signal() and signal.siginterrupt() raise an OSError, + instead of a RuntimeError: OSError has an errno attribute. + +- Issue #3709: add a flush_headers method to BaseHTTPRequestHandler, which + manages the sending of headers to output stream and flushing the internal + headers buffer. Patch contribution by Andrew Schaaf + +- Issue #11743: Rewrite multiprocessing connection classes in pure Python. + +- Issue #11164: Stop trying to use _xmlplus in the xml module. + +- Issue #11888: Add log2 function to math module. Patch written by Mark + Dickinson. + +- Issue #12012: ssl.PROTOCOL_SSLv2 becomes optional. + +- Issue #8407: The signal handler writes the signal number as a single byte + instead of a nul byte into the wakeup file descriptor. So it is possible to + wait more than one signal and know which signals were raised. + +- Issue #8407: Add pthread_kill(), sigpending() and sigwait() functions to the + signal module. + +- Issue #11927: SMTP_SSL now uses port 465 by default as documented. Patch + by Kasun Herath. + +- Issue #12002: ftplib's abort() method raises TypeError. + +- Issue #11916: Add a number of MacOSX specific definitions to the errno module. + Patch by Pierre Carrier. + +- Issue #11999: fixed sporadic sync failure mailbox.Maildir due to its trying to + detect mtime changes by comparing to the system clock instead of to the + previous value of the mtime. + +- Issue #11072: added MLSD command (RFC-3659) support to ftplib. + +- Issue #8808: The IMAP4_SSL constructor now allows passing an SSLContext + parameter to control parameters of the secure channel. Patch by Sijin + Joseph. + +- ntpath.samefile failed to notice that "a.txt" and "A.TXT" refer to the same + file on Windows XP. As noticed in issue #10684. + +- Issue #12000: When a SSL certificate has a subjectAltName without any + dNSName entry, ssl.match_hostname() should use the subject's commonName. + Patch by Nicolas Bareil. + +- Issue #10775: assertRaises, assertRaisesRegex, assertWarns, and + assertWarnsRegex now accept a keyword argument 'msg' when used as context + managers. Initial patch by Winston Ewert. + +- Issue #10684: shutil.move used to delete a folder on case insensitive + filesystems when the source and destination name where the same except + for the case. + +- Issue #11647: objects created using contextlib.contextmanager now support + more than one call to the function when used as a decorator. Initial patch + by Ysj Ray. + +- Issue #11930: Removed deprecated time.accept2dyear variable. + Removed year >= 1000 restriction from datetime.strftime. + +- logging: don't define QueueListener if Python has no thread support. + +- functools.cmp_to_key() now works with collections.Hashable(). + +- Issue #11277: mmap.mmap() calls fcntl(fd, F_FULLFSYNC) on Mac OS X to get + around a mmap bug with sparse files. Patch written by Steffen Daode Nurpmeso. + +- Issue #8407: Add signal.pthread_sigmask() function to fetch and/or change the + signal mask of the calling thread. + +- Issue #11858: configparser.ExtendedInterpolation expected lower-case section + names. + +- Issue #11324: ConfigParser(interpolation=None) now works correctly. + +- Issue #11811: ssl.get_server_certificate() is now IPv6-compatible. Patch + by Charles-François Natali. + +- Issue #11763: don't use difflib in TestCase.assertMultiLineEqual if the + strings are too long. + +- Issue #11236: getpass.getpass responds to ctrl-c or ctrl-z on terminal. + +- Issue #11856: Speed up parsing of JSON numbers. + +- Issue #11005: threading.RLock()._release_save() raises a RuntimeError if the + lock was not acquired. + +- Issue #11258: Speed up ctypes.util.find_library() under Linux by a factor + of 5 to 10. Initial patch by Jonas H. + +- Issue #11382: Trivial system calls, such as dup() or pipe(), needn't + release the GIL. Patch by Charles-François Natali. + +- Issue #11223: Add threading._info() function providing informations about + the thread implementation. + +- Issue #11731: simplify/enhance email parser/generator API by introducing + policy objects. + +- Issue #11768: The signal handler of the signal module only calls + Py_AddPendingCall() for the first signal to fix a deadlock on reentrant or + parallel calls. PyErr_SetInterrupt() writes also into the wake up file. + +- Issue #11492: fix several issues with header folding in the email package. + +- Issue #11852: Add missing imports and update tests. + +- Issue #11875: collections.OrderedDict's __reduce__ was temporarily + mutating the object instead of just working on a copy. + +- Issue #11467: Fix urlparse behavior when handling urls which contains scheme + specific part only digits. Patch by Santoso Wijaya. + +- collections.Counter().copy() now works correctly for subclasses. + +- Issue #11474: Fix the bug with url2pathname() handling of '/C|/' on Windows. + Patch by Santoso Wijaya. + +- Issue #11684: complete email.parser bytes API by adding BytesHeaderParser. + +- The bz2 module now handles 4GiB+ input buffers correctly. + +- Issue #9233: Fix json.loads('{}') to return a dict (instead of a list), when + _json is not available. + +- Issue #11830: Remove unnecessary introspection code in the decimal module. + +- Issue #11703: urllib2.geturl() does not return correct url when the original + url contains #fragment. + +- Issue #10019: Fixed regression in json module where an indent of 0 stopped + adding newlines and acted instead like 'None'. + +- Issue #11186: pydoc ignores a module if its name contains a surrogate + character in the index of modules. + +- Issue #11815: Use a light-weight SimpleQueue for the result queue in + concurrent.futures.ProcessPoolExecutor. + +- Issue #5162: Treat services like frozen executables to allow child spawning + from multiprocessing.forking on Windows. + +- logging.basicConfig now supports an optional 'handlers' argument taking an + iterable of handlers to be added to the root logger. Additional parameter + checks were also added to basicConfig. + +- Issue #11814: Fix likely typo in multiprocessing.Pool._terminate(). + +- Issue #11747: Fix range formatting in difflib.context_diff() and + difflib.unified_diff(). + +- Issue #8428: Fix a race condition in multiprocessing.Pool when terminating + worker processes: new processes would be spawned while the pool is being + shut down. Patch by Charles-François Natali. + +- Issue #2650: re.escape() no longer escapes the '_'. + +- Issue #11757: select.select() now raises ValueError when a negative timeout + is passed (previously, a select.error with EINVAL would be raised). Patch + by Charles-François Natali. + +- Issue #7311: fix html.parser to accept non-ASCII attribute values. + +- Issue #11605: email.parser.BytesFeedParser was incorrectly converting + multipart subparts with an 8-bit CTE into unicode instead of preserving the + bytes. + +- Issue #1690608: email.util.formataddr is now RFC 2047 aware: it now has a + charset parameter that defaults to utf-8 and is used as the charset for RFC + 2047 encoding when the realname contains non-ASCII characters. + +- Issue #10963: Ensure that subprocess.communicate() never raises EPIPE. + +- Issue #10791: Implement missing method GzipFile.read1(), allowing GzipFile + to be wrapped in a TextIOWrapper. Patch by Nadeem Vawda. + +- Issue #11707: Added a fast C version of functools.cmp_to_key(). + Patch by Filip Gruszczyński. + +- Issue #11688: Add sqlite3.Connection.set_trace_callback(). Patch by + Torsten Landschoff. + +- Issue #11746: Fix SSLContext.load_cert_chain() to accept elliptic curve + private keys. + +- Issue #5863: Rewrite BZ2File in pure Python, and allow it to accept + file-like objects using a new ``fileobj`` constructor argument. Patch by + Nadeem Vawda. + +- unittest.TestCase.assertSameElements has been removed. + +- sys.getfilesystemencoding() raises a RuntimeError if initfsencoding() was not + called yet: detect bootstrap (startup) issues earlier. + +- Issue #11393: Add the new faulthandler module. + +- Issue #11618: Fix the timeout logic in threading.Lock.acquire() under Windows. + +- Removed the 'strict' argument to email.parser.Parser, which has been + deprecated since Python 2.4. + +- Issue #11256: Fix inspect.getcallargs on functions that take only keyword + arguments. + +- Issue #11696: Fix ID generation in msilib. + +- itertools.accumulate now supports an optional *func* argument for + a user-supplied binary function. + +- Issue #11692: Remove unnecessary demo functions in subprocess module. + +- Issue #9696: Fix exception incorrectly raised by xdrlib.Packer.pack_int when + trying to pack a negative (in-range) integer. + +- Issue #11675: multiprocessing.[Raw]Array objects created from an integer size + are now zeroed on creation. This matches the behaviour specified by the + documentation. + +- Issue #7639: Fix short file name generation in bdist_msi + +- Issue #11659: Fix ResourceWarning in test_subprocess introduced by #11459. + Patch by Ben Hayden. + +- Issue #11635: Don't use polling in worker threads and processes launched by + concurrent.futures. + +- Issue #6811: Allow importlib to change a code object's co_filename attribute + to match the path to where the source code currently is, not where the code + object originally came from. + +- Issue #8754: Have importlib use the repr of a module name in error messages. + +- Issue #11591: Prevent "import site" from modifying sys.path when python + was started with -S. + +- collections.namedtuple() now adds a _source attribute to the generated + class. This make the source more accessible than the outdated + "verbose" option which prints to stdout but doesn't make the source + string available. + +- Issue #11371: Mark getopt error messages as localizable. Patch by Filip + Gruszczyński. + +- Issue #11333: Add __slots__ to collections ABCs. + +- Issue #11628: cmp_to_key generated class should use __slots__. + +- Issue #11666: let help() display named tuple attributes and methods + that start with a leading underscore. + +- Issue #11662: Make urllib and urllib2 ignore redirections if the + scheme is not HTTP, HTTPS or FTP (CVE-2011-1521). + +- Issue #5537: Fix time2isoz() and time2netscape() functions of + httplib.cookiejar for expiration year greater than 2038 on 32-bit systems. + +- Issue #4391: Use proper gettext plural forms in optparse. + +- Issue #11127: Raise a TypeError when trying to pickle a socket object. + +- Issue #11563: Connection:close header is sent by requests using URLOpener + class which helps in closing of sockets after connection is over. Patch + contributions by Jeff McNeil and Nadeem Vawda. + +- Issue #11459: A ``bufsize`` value of 0 in subprocess.Popen() really creates + unbuffered pipes, such that select() works properly on them. + +- Issue #5421: Fix misleading error message when one of socket.sendto()'s + arguments has the wrong type. Patch by Nikita Vetoshkin. + +- Issue #10812: Add some extra posix functions to the os module. + +- Issue #10979: unittest stdout buffering now works with class and module + setup and teardown. + +- Issue #11577: fix ResourceWarning triggered by improved binhex test coverage + +- Issue #11243: fix the parameter querying methods of Message to work if + the headers contain un-encoded non-ASCII data. + +- Issue #11401: fix handling of headers with no value; this fixes a regression + relative to Python2 and the result is now the same as it was in Python2. + +- Issue #9298: base64 bodies weren't being folded to line lengths less than 78, + which was a regression relative to Python2. Unlike Python2, the last line + of the folded body now ends with a carriage return. + +- Issue #11560: shutil.unpack_archive now correctly handles the format + parameter. Patch by Evan Dandrea. + +- Issue #5870: Add `subprocess.DEVNULL` constant. + +- Issue #11133: fix two cases where inspect.getattr_static can trigger code + execution. Patch by Andreas Stührk. + +- Issue #11569: use absolute path to the sysctl command in multiprocessing to + ensure that it will be found regardless of the shell PATH. This ensures + that multiprocessing.cpu_count works on default installs of MacOSX. + +- Issue #11501: disutils.archive_utils.make_zipfile no longer fails if zlib is + not installed. Instead, the zipfile.ZIP_STORED compression is used to create + the ZipFile. Patch by Natalia B. Bidart. + +- Issue #11289: `smtp.SMTP` class is now a context manager so it can be used + in a `with` statement. Contributed by Giampaolo Rodola. + +- Issue #11554: Fixed support for Japanese codecs; previously the body output + encoding was not done if euc-jp or shift-jis was specified as the charset. + +- Issue #11509: Significantly increase test coverage of fileinput. + Patch by Denver Coneybeare at PyCon 2011 Sprints. + +- Issue #11407: `TestCase.run` returns the result object used or created. + Contributed by Janathan Hartley. + +- Issue #11500: Fixed a bug in the OS X proxy bypass code for fully qualified + IP addresses in the proxy exception list. + +- Issue #11491: dbm.error is no longer raised when dbm.open is called with + the "n" as the flag argument and the file exists. The behavior matches + the documentation and general logic. + +- Issue #1162477: Postel Principle adjustment to email date parsing: handle the + fact that some non-compliant MUAs use '.' instead of ':' in time specs. + +- Issue #11131: Fix sign of zero in decimal.Decimal plus and minus + operations when the rounding mode is ROUND_FLOOR. + +- Issue #9935: Speed up pickling of instances of user-defined classes. + +- Issue #5622: Fix curses.wrapper to raise correct exception if curses + initialization fails. + +- Issue #11408: In threading.Lock.acquire(), only call gettimeofday() when + really necessary. Patch by Charles-François Natali. + +- Issue #11391: Writing to a mmap object created with + ``mmap.PROT_READ|mmap.PROT_EXEC`` would segfault instead of raising a + TypeError. Patch by Charles-François Natali. + +- Issue #9795: add context manager protocol support for nntplib.NNTP class. + +- Issue #11306: mailbox in certain cases adapts to an inability to open + certain files in read-write mode. Previously it detected this by + checking for EACCES, now it also checks for EROFS. + +- Issue #11265: asyncore now correctly handles EPIPE, EBADF and EAGAIN errors + on accept(), send() and recv(). + +- Issue #11377: Deprecate platform.popen() and reimplement it with os.popen(). + +- Issue #8513: On UNIX, subprocess supports bytes command string. + +- Issue #10866: Add socket.sethostname(). Initial patch by Ross Lagerwall. + +- Issue #11140: Lock.release() now raises a RuntimeError when attempting + to release an unacquired lock, as claimed in the threading documentation. + The _thread.error exception is now an alias of RuntimeError. Patch by + Filip Gruszczyński. Patch for _dummy_thread by Aymeric Augustin. + +- Issue #8594: ftplib now provides a source_address parameter to specify which + (address, port) to bind to before connecting. + +- Issue #11326: Add the missing connect_ex() implementation for SSL sockets, + and make it work for non-blocking connects. + +- Issue #11297: Add collections.ChainMap(). + +- Issue #10755: Add the posix.flistdir() function. Patch by Ross Lagerwall. + +- Issue #4761: Add the ``*at()`` family of functions (openat(), etc.) to the + posix module. Patch by Ross Lagerwall. + +- Issue #7322: Trying to read from a socket's file-like object after a timeout + occurred now raises an error instead of silently losing data. + +- Issue #11291: poplib.POP no longer suppresses errors on quit(). + +- Issue #11177: asyncore's create_socket() arguments can now be omitted. + +- Issue #6064: Add a ``daemon`` keyword argument to the threading.Thread + and multiprocessing.Process constructors in order to override the + default behaviour of inheriting the daemonic property from the current + thread/process. + +- Issue #10956: Buffered I/O classes retry reading or writing after a signal + has arrived and the handler returned successfully. + +- Issue #10784: New os.getpriority() and os.setpriority() functions. + +- Issue #11114: Fix catastrophic performance of tell() on text files (up + to 1000x faster in some cases). It is still one to two order of magnitudes + slower than binary tell(). + +- Issue #10882: Add os.sendfile function. + +- Issue #10868: Allow usage of the register method of an ABC as a class + decorator. + +- Issue #11224: Fixed a regression in tarfile that affected the file-like + objects returned by TarFile.extractfile() regarding performance, memory + consumption and failures with the stream interface. + +- Issue #10924: Adding salt and Modular Crypt Format to crypt library. + Moved old C wrapper to _crypt, and added a Python wrapper with + enhanced salt generation and simpler API for password generation. + +- Issue #11074: Make 'tokenize' so it can be reloaded. + +- Issue #11085: Moved collections abstract base classes into a separate + module called collections.abc, following the pattern used by importlib.abc. + For backwards compatibility, the names are imported into the collections + module. + +- Issue #4681: Allow mmap() to work on file sizes and offsets larger than + 4GB, even on 32-bit builds. Initial patch by Ross Lagerwall, adapted for + 32-bit Windows. + +- Issue #11169: compileall module uses repr() to format filenames and paths to + escape surrogate characters and show spaces. + +- Issue #11089: Fix performance issue limiting the use of ConfigParser() + with large config files. + +- Issue #10276: Fix the results of zlib.crc32() and zlib.adler32() on buffers + larger than 4GB. Patch by Nadeem Vawda. + +- Issue #11388: Added a clear() method to MutableSequence + +- Issue #11174: Add argparse.MetavarTypeHelpFormatter, which uses type names + for the names of optional and positional arguments in help messages. + +- Issue #9348: Raise an early error if argparse nargs and metavar don't match. + +- Issue #8982: Improve the documentation for the argparse Namespace object. + +- Issue #9343: Document that argparse parent parsers must be configured before + their children. + +- Issue #9026: Fix order of argparse sub-commands in help messages. + +- Issue #9347: Fix formatting for tuples in argparse type= error messages. + +- Issue #12191: Added shutil.chown() to change user and/or group owner of a + given path also specifying their names. + +- Issue #13988: The _elementtree accelerator is used whenever available. + Now xml.etree.cElementTree becomes a deprecated alias to ElementTree. + +Build +----- + +- Issue #6807: Run msisupport.mak earlier. + +- Issue #10580: Minor grammar change in Windows installer. + +- Issue #13326: Clean __pycache__ directories correctly on OpenBSD. + +- PEP 393: the configure option --with-wide-unicode is removed. + +- Issue #12852: Set _XOPEN_SOURCE to 700, instead of 600, to get POSIX 2008 + functions on OpenBSD (e.g. fdopendir). + +- Issue #11863: Remove support for legacy systems deprecated in Python 3.2 + (following PEP 11). These systems are systems using Mach C Threads, + SunOS lightweight processes, GNU pth threads and IRIX threads. + +- Issue #8746: Correct faulty configure checks so that os.chflags() and + os.lchflags() are once again built on systems that support these + functions (BSD and OS X). Also add new stat file flags for OS X + (UF_HIDDEN and UF_COMPRESSED). + +- Issue #10645: Installing Python no longer creates a + Python-X.Y.Z-pyX.Y.egg-info file in the lib-dynload directory. + +- Do not accidentally include the directory containing sqlite.h twice when + building sqlite3. + +- Issue #11217: For 64-bit/32-bit Mac OS X universal framework builds, + ensure "make install" creates symlinks in --prefix bin for the "-32" + files in the framework bin directory like the installer does. + +- Issue #11347: Use --no-as-needed when linking libpython3.so. + +- Issue #11411: Fix 'make DESTDIR=' with a relative destination. + +- Issue #11268: Prevent Mac OS X Installer failure if Documentation + package had previously been installed. + +- Issue #11495: OSF support is eliminated. It was deprecated in Python 3.2. + + +IDLE +---- + +- Issue #11718: IDLE's open module dialog couldn't find the __init__.py + file in a package. + +Tools/Demos +----------- + +- Issue #14053: patchcheck.py ("make patchcheck") now works with MQ patches. + Patch by Francisco Martín Brugué. + +- Issue #13930: 2to3 is now able to write its converted output files to another + directory tree as well as copying unchanged files and altering the file + suffix. See its new -o, -W and --add-suffix options. This makes it more + useful in many automated code translation workflows. + +- Issue #13628: python-gdb.py is now able to retrieve more frames in the Python + traceback if Python is optimized. + +- Issue #11996: libpython (gdb), replace "py-bt" command by "py-bt-full" and + add a smarter "py-bt" command printing a classic Python traceback. + +- Issue #11179: Make ccbench work under Python 3.1 and 2.7 again. + +- Issue #10639: reindent.py no longer converts newlines and will raise + an error if attempting to convert a file with mixed newlines. + "--newline" option added to specify new line character. + +Extension Modules +----------------- + +- Issue #13840: The error message produced by ctypes.create_string_buffer + when given a Unicode string has been fixed. + +- Issue #9975: socket: Fix incorrect use of flowinfo and scope_id. Patch by + Vilmos Nebehaj. + +- Issue #7777: socket: Add Reliable Datagram Sockets (PF_RDS) support. + +- Issue #13159: FileIO and BZ2Compressor/BZ2Decompressor now use a linear-time + buffer growth strategy instead of a quadratic-time one. + +- Issue #10141: socket: Add SocketCAN (PF_CAN) support. Initial patch by + Matthias Fuchs, updated by Tiago Gonçalves. + +- Issue #13070: Fix a crash when a TextIOWrapper caught in a reference cycle + would be finalized after the reference to its underlying BufferedRWPair's + writer got cleared by the GC. + +- Issue #12881: ctypes: Fix segfault with large structure field names. + +- Issue #13058: ossaudiodev: fix a file descriptor leak on error. Patch by + Thomas Jarosch. + +- Issue #13013: ctypes: Fix a reference leak in PyCArrayType_from_ctype. + Thanks to Suman Saha for finding the bug and providing a patch. + +- Issue #13022: Fix: _multiprocessing.recvfd() doesn't check that + file descriptor was actually received. + +- Issue #1172711: Add 'long long' support to the array module. + Initial patch by Oren Tirosh and Hirokazu Yamamoto. + +- Issue #12483: ctypes: Fix a crash when the destruction of a callback + object triggers the garbage collector. + +- Issue #12950: Fix passing file descriptors in multiprocessing, under + OpenIndiana/Illumos. + +- Issue #12764: Fix a crash in ctypes when the name of a Structure field is not + a string. + +- Issue #11241: subclasses of ctypes.Array can now be subclassed. + +- Issue #9651: Fix a crash when ctypes.create_string_buffer(0) was passed to + some functions like file.write(). + +- Issue #10309: Define _GNU_SOURCE so that mremap() gets the proper + signature. Without this, architectures where sizeof void* != sizeof int are + broken. Patch given by Hallvard B Furuseth. + +- Issue #12051: Fix segfault in json.dumps() while encoding highly-nested + objects using the C accelerations. + +- Issue #12017: Fix segfault in json.loads() while decoding highly-nested + objects using the C accelerations. + +- Issue #1838: Prevent segfault in ctypes, when _as_parameter_ on a class is set + to an instance of the class. + +Tests +----- + +- Issue #11689: Fix a variable scoping error in an sqlite3 test + +- Issue #13786: Remove unimplemented 'trace' long option from regrtest.py. + +- Issue #13725: Fix regrtest to recognize the documented -d flag. + Patch by Erno Tukia. + +- Issue #13304: Skip test case if user site-packages disabled (-s or + PYTHONNOUSERSITE). (Patch by Carl Meyer) + +- Issue #5661: Add a test for ECONNRESET/EPIPE handling to test_asyncore. Patch + by Xavier de Gaye. + +- Issue #13218: Fix test_ssl failures on Debian/Ubuntu. + +- Re-enable lib2to3's test_parser.py tests, though with an expected failure + (see issue 13125). + +- Issue #12656: Add tests for IPv6 and Unix sockets to test_asyncore. + +- Issue #6484: Add unit tests for mailcap module (patch by Gregory Nofi) + +- Issue #11651: Improve the Makefile test targets to run more of the test suite + more quickly. The --multiprocess option is now enabled by default, reducing + the amount of time needed to run the tests. "make test" and "make quicktest" + now include some resource-intensive tests, but no longer run the test suite + twice to check for bugs in .pyc generation. Tools/scripts/run_test.py provides + an easy platform-independent way to run test suite with sensible defaults. + +- Issue #12331: The test suite for the packaging module can now run from an + installed Python. + +- Issue #12331: The test suite for lib2to3 can now run from an installed + Python. + +- Issue #12626: In regrtest, allow to filter tests using a glob filter + with the ``-m`` (or ``--match``) option. This works with all test cases + using the unittest module. This is useful with long test suites + such as test_io or test_subprocess. + +- Issue #12624: It is now possible to fail after the first failure when + running in verbose mode (``-v`` or ``-W``), by using the ``--failfast`` + (or ``-G``) option to regrtest. This is useful with long test suites + such as test_io or test_subprocess. + +- Issue #12587: Correct faulty test file and reference in test_tokenize. + (Patch by Robert Xiao) + +- Issue #12573: Add resource checks for dangling Thread and Process objects. + +- Issue #12549: Correct test_platform to not fail when OS X returns 'x86_64' + as the processor type on some Mac systems. + +- Skip network tests when getaddrinfo() returns EAI_AGAIN, meaning a temporary + failure in name resolution. + +- Issue #11812: Solve transient socket failure to connect to 'localhost' + in test_telnetlib.py. + +- Solved a potential deadlock in test_telnetlib.py. Related to issue #11812. + +- Avoid failing in test_robotparser when mueblesmoraleda.com is flaky and + an overzealous DNS service (e.g. OpenDNS) redirects to a placeholder + Web site. + +- Avoid failing in test_urllibnet.test_bad_address when some overzealous + DNS service (e.g. OpenDNS) resolves a non-existent domain name. The test + is now skipped instead. + +- Issue #12440: When testing whether some bits in SSLContext.options can be + reset, check the version of the OpenSSL headers Python was compiled against, + rather than the runtime version of the OpenSSL library. + +- Issue #11512: Add a test suite for the cgitb module. Patch by Robbie Clemons. + +- Issue #12497: Install test/data to prevent failures of the various codecmaps + tests. + +- Issue #12496: Install test/capath directory to prevent test_connect_capath + testcase failure in test_ssl. + +- Issue #12469: Run wakeup and pending signal tests in a subprocess to run the + test in a fresh process with only one thread and to not change signal + handling of the parent process. + +- Issue #8716: Avoid crashes caused by Aqua Tk on OSX when attempting to run + test_tk or test_ttk_guionly under a username that is not currently logged + in to the console windowserver (as may be the case under buildbot or ssh). + +- Issue #12407: Explicitly skip test_capi.EmbeddingTest under Windows. + +- Issue #12400: regrtest -W doesn't rerun the tests twice anymore, but captures + the output and displays it on failure instead. regrtest -v doesn't print the + error twice anymore if there is only one error. + +- Issue #12141: Install copies of template C module file so that + test_build_ext of test_distutils and test_command_build_ext of + test_packaging are no longer silently skipped when + run outside of a build directory. + +- Issue #8746: Add additional tests for os.chflags() and os.lchflags(). + Patch by Garrett Cooper. + +- Issue #10736: Fix test_ttk test_widgets failures with Cocoa Tk 8.5.9 + 2.8 + on Mac OS X. (Patch by Ronald Oussoren) + +- Issue #12057: Add tests for ISO 2022 codecs (iso2022_jp, iso2022_jp_2, + iso2022_kr). + +- Issue #12096: Fix a race condition in test_threading.test_waitfor(). Patch + written by Charles-François Natali. + +- Issue #11614: import __hello__ prints "Hello World!". Patch written by + Andreas Stührk. + +- Issue #5723: Improve json tests to be executed with and without accelerations. + +- Issue #12041: Make test_wait3 more robust. + +- Issue #11873: Change regex in test_compileall to fix occasional failures when + when the randomly generated temporary path happened to match the regex. + +- Issue #11958: Fix FTP tests for IPv6, bind to "::1" instead of "localhost". + Patch written by Charles-Francois Natali. + +- Issue #8407, #11859: Fix tests of test_io using threads and an alarm: use + pthread_sigmask() to ensure that the SIGALRM signal is received by the main + thread. + +- Issue #11811: Factor out detection of IPv6 support on the current host + and make it available as ``test.support.IPV6_ENABLED``. Patch by + Charles-François Natali. + +- Issue #10914: Add a minimal embedding test to test_capi. + +- Issue #11223: Skip test_lock_acquire_interruption() and + test_rlock_acquire_interruption() of test_threadsignals if a thread lock is + implemented using a POSIX mutex and a POSIX condition variable. A POSIX + condition variable cannot be interrupted by a signal (e.g. on Linux, the + futex system call is restarted). + +- Issue #11790: Fix sporadic failures in test_multiprocessing.WithProcessesTestCondition. + +- Fix possible "file already exists" error when running the tests in parallel. + +- Issue #11719: Fix message about unexpected test_msilib skip on non-Windows + platforms. Patch by Nadeem Vawda. + +- Issue #11727: Add a --timeout option to regrtest: if a test takes more than + TIMEOUT seconds, dumps the traceback of all threads and exits. + +- Issue #11653: fix -W with -j in regrtest. + +- The email test suite now lives in the Lib/test/test_email package. The test + harness code has also been modernized to allow use of new unittest features. + +- regrtest now discovers test packages as well as test modules. + +- Issue #11577: improve test coverage of binhex.py. Patch by Arkady Koplyarov. + +- New test_crashers added to exercise the scripts in the Lib/test/crashers + directory and confirm they fail as expected + +- Issue #11578: added test for the timeit module. Patch by Michael Henry. + +- Issue #11503: improve test coverage of posixpath.py. Patch by Evan Dandrea. + +- Issue #11505: improves test coverage of string.py, increases granularity of + string.Formatter tests. Initial patch by Alicia Arlen. + +- Issue #11548: Improve test coverage of the shutil module. Patch by + Evan Dandrea. + +- Issue #11554: Reactivated test_email_codecs. + +- Issue #11505: improves test coverage of string.py. Patch by Alicia + Arlen + +- Issue #11490: test_subprocess:test_leaking_fds_on_error no longer gives a + false positive if the last directory in the path is inaccessible. + +- Issue #11223: Fix test_threadsignals to fail, not hang, when the + non-semaphore implementation of locks is used under POSIX. + +- Issue #10911: Add tests on CGI with non-ASCII characters. Patch written by + Pierre Quentel. + +- Issue #9931: Fix hangs in GUI tests under Windows in certain conditions. + Patch by Hirokazu Yamamoto. + +- Issue #10512: Properly close sockets under test.test_cgi. + +- Issue #10992: Make tests pass under coverage. + +- Issue #10826: Prevent sporadic failure in test_subprocess on Solaris due + to open door files. + +- Issue #10990: Prevent tests from clobbering a set trace function. + +C-API +----- + +- Add PyObject_GenericGetDict and PyObject_GeneriSetDict. They are generic + implementations for the getter and setter of a ``__dict__`` descriptor of C + types. + +- Issue #13727: Add 3 macros to access PyDateTime_Delta members: + PyDateTime_DELTA_GET_DAYS, PyDateTime_DELTA_GET_SECONDS, + PyDateTime_DELTA_GET_MICROSECONDS. + +- Issue #10542: Add 4 macros to work with surrogates: Py_UNICODE_IS_SURROGATE, + Py_UNICODE_IS_HIGH_SURROGATE, Py_UNICODE_IS_LOW_SURROGATE, + Py_UNICODE_JOIN_SURROGATES. + +- Issue #12724: Add Py_RETURN_NOTIMPLEMENTED macro for returning NotImplemented. + +- PY_PATCHLEVEL_REVISION has been removed, since it's meaningless with + Mercurial. + +- Issue #12173: The first argument of PyImport_ImportModuleLevel is now `const + char *` instead of `char *`. + +- Issue #12380: PyArg_ParseTuple now accepts a bytearray for the 'c' format. + +Documentation +------------- + +- Issue #13498: Clarify docs of os.makedirs()'s exist_ok argument. Done with + great native-speaker help from R. David Murray. + +- Issues #13491 and #13995: Fix many errors in sqlite3 documentation. + Initial patch for #13491 by Johannes Vogel. + +- Issue #13402: Document absoluteness of sys.executable. + +- Issue #13883: PYTHONCASEOK also works on OS X. + +- Issue #9021: Add an introduction to the copy module documentation. + +- Issue #6005: Examples in the socket library documentation use sendall, where + relevant, instead send method. + +- Issue #12798: Updated the mimetypes documentation. + +- Issue #12949: Document the kwonlyargcount argument for the PyCode_New + C API function. + +- Issue #13513: Fix io.IOBase documentation to correctly link to the + io.IOBase.readline method instead of the readline module. + +- Issue #13237: Reorganise subprocess documentation to emphasise convenience + functions and the most commonly needed arguments to Popen. + +- Issue #13141: Demonstrate recommended style for socketserver examples. + +- Issue #11818: Fix tempfile examples for Python 3. + + **(For information about older versions, consult the HISTORY file.)** |