+++++++++++

Python News

+++++++++++

What's New in Python 3.3.3 release candidate 1?

===============================================

*Not yet released, see sections below for changes released in 3.3.2*

.. *Release date: TBD*

Core and Builtins

-----------------

- Issue #18328: Reorder ops in PyThreadState_Delete*() functions. Now the

tstate is first removed from TLS and then deallocated.

- Issue #18184: PyUnicode_FromFormat() and PyUnicode_FromFormatV() now raise

OverflowError when an argument of %c format is out of range.

- Issue #18137: Detect integer overflow on precision in float.__format__()

and complex.__format__().

- Issue #18183: Fix various unicode operations on strings with large unicode

codepoints.

- Issue #18180: Fix ref leak in _PyImport_GetDynLoadWindows().

- Issue #18038: SyntaxError raised during compilation sources with illegal

encoding now always contains an encoding name.

- Issue #17644: Fix a crash in str.format when curly braces are used in square

brackets.

- Issue #17983: Raise a SyntaxError for a ``global __class__`` statement in a

class body.

- Issue #17927: Frame objects kept arguments alive if they had been copied into

a cell, even if the cell was cleared.

Library

-------

- Issue #18347: ElementTree's html serializer now preserves the case of

closing tags.

- Issue #17261: Ensure multiprocessing's proxies use proper address.

- Issue #18343: faulthandler.register() now keeps the previous signal handler

when the function is called twice, so faulthandler.unregister() restores

correctly the original signal handler.

- Issue #17097: Make multiprocessing ignore EINTR.

- Issue #18339: Negative ints keys in unpickler.memo dict no longer cause a

segfault inside the _pickle C extension.

- Issue #18224: Removed pydoc script from created venv, as it causes problems

on Windows and adds no value over and above python -m pydoc ...

- Issue #18155: The csv module now correctly handles csv files that use

a delimter character that has a special meaning in regexes, instead of

throwing an exception.

- Issue #14360: encode_quopri can now be successfully used as an encoder

when constructing a MIMEApplication object.

- Issue #18135: ssl.SSLSocket.write() now raises an OverflowError if the input

string in longer than 2 gigabytes, and ssl.SSLContext.load_cert_chain()

raises a ValueError if the password is longer than 2 gigabytes. The ssl

module does not support partial write.

- Issue #18248: Fix libffi build on AIX.

- Issue #18259: Declare sethostname in socketmodule.c for AIX

- Issue #18167: cgi.FieldStorage no longer fails to handle multipart/form-data

when \r\n appears at end of 65535 bytes without other newlines.

- subprocess: Prevent a possible double close of parent pipe fds when the

subprocess exec runs into an error. Prevent a regular multi-close of the

/dev/null fd when any of stdin, stdout and stderr was set to DEVNULL.

- Issue #16102: Make uuid._netbios_getnode() work again on Python 3.

- Issue #18109: os.uname() now decodes fields from the locale encoding, and

socket.gethostname() now decodes the hostname from the locale encoding,

instead of using the UTF-8 encoding in strict mode.

- Issue #17403: urllib.parse.robotparser normalizes the urls before adding to

ruleline. This helps in handling certain types invalid urls in a conservative

manner.

- Issue #18025: Fixed a segfault in io.BufferedIOBase.readinto() when raw

stream's read() returns more bytes than requested.

- Issue #18011: base64.b32decode() now raises a binascii.Error if there are

non-alphabet characters present in the input string to conform a docstring.

Updated the module documentation.

- Issue #13772: Restored directory detection of targets in ``os.symlink`` on

Windows, which was temporarily removed in Python 3.2.3 due to an incomplete

implementation. The implementation now works even if the symlink is created

in a location other than the current directory.

- Issue #16986: ElementTree now correctly parses a string input not only when

an internal XML encoding is UTF-8 or US-ASCII.

- Issue #17812: Fixed quadratic complexity of base64.b32encode().

- Issue #17980: Fix possible abuse of ssl.match_hostname() for denial of

service using certificates with many wildcards (CVE-2013-2099).

- Issue #17981: Closed socket on error in SysLogHandler.

- Fix typos in the multiprocessing module.

- Issue #17754: Make ctypes.util.find_library() independent of the locale.

- Issue #17968: Fix memory leak in os.listxattr().

- Issue #17269: Workaround for socket.getaddrinfo crash on MacOS X

with port None or "0" and flags AI_NUMERICSERV.

- Issue #18080: When building a C extension module on OS X, if the compiler

is overriden with the CC environment variable, use the new compiler as

the default for linking if LDSHARED is not also overriden. This restores

Distutils behavior introduced in 3.2.3 and inadvertently dropped in 3.3.0.

- Issue #18113: Fixed a refcount leak in the curses.panel module's

set_userptr() method. Reported by Atsuo Ishimoto.

C API

-----

- Issue #18351: Fix various issues with a helper function in importlib used

by PyImport_ExecCodeModuleWithPathnames() (and thus by extension PyImport_ExecCodeModule() and PyImport_ExecCodeModuleEx()).

IDLE

----

- Issue #7136: In the Idle File menu, "New Window" is renamed "New File".

Patch by Tal Einat, Roget Serwy, and Todd Rovito.

- Remove dead imports of imp.

- Issue #18196: Avoid displaying spurious SystemExit tracebacks.

- Issue #5492: Avoid traceback when exiting IDLE caused by a race condition.

- Issue #17511: Keep IDLE find dialog open after clicking "Find Next".

Original patch by Sarah K.

- Issue #18055: Move IDLE off of imp and on to importlib.

- Issue #15392: Create a unittest framework for IDLE.

Initial patch by Rajagopalasarma Jayakrishnan.

- Issue #14146: Highlight source line while debugging on Windows.

- Issue #17532: Always include Options menu for IDLE on OS X.

Patch by Guilherme Simões.

Tests

-----

- Issue #18375: Assume --randomize when --randseed is used for running the

testsuite.

- Issue #11185: Fix test_wait4 under AIX. Patch by Sébastien Sablé.

- Issue #17691: test_univnewlines now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #18094: test_uuid no more reports skipped tests as passed.

- Issue #11995: test_pydoc doesn't import all sys.path modules anymore.

Documentation

-------------

- Issue #17953: Mention that you shouldn't replace sys.modules and deleting key

items will cause Python to not be happy.

- Issue #17844: Add links to encoders and decoders for bytes-to-bytes codecs.

- Issue #14097: improve the "introduction" page of the tutorial.

- Issue #17977: The documentation for the cadefault argument's default value

in urllib.request.urlopen() is fixed to match the code.

Tools/Demos

-----------

- Issue #15239: Make mkstringprep.py work again on Python 3.

- Issue #12990: The "Python Launcher" on OSX could not launch python scripts

that have paths that include wide characters.

Build

-----

- Issue #18256: Compilation fix for recent AIX releases. Patch by

David Edelsohn.

- Issue #15172: Document NASM 2.10+ as requirement for building OpenSSL 1.0.1

on Windows.

What's New in Python 3.3.2?

===========================

*Release date: 13-May-2013*

Core and Builtins

-----------------

- Issue #17237: Fix crash in the ASCII decoder on m68k.

- Issue #17408: Avoid using an obsolete instance of the copyreg module when

the interpreter is shutdown and then started again.

- Issue #17863: In the interactive console, don't loop forever if the encoding

can't be fetched from stdin.

- Issue #17867: Raise an ImportError if __import__ is not found in __builtins__.

- Issue #17857: Prevent build failures with pre-3.5.0 versions of sqlite3,

such as was shipped with Centos 5 and Mac OS X 10.4.

- Issue #17413: sys.settrace callbacks were being passed a string instead of an

exception instance for the 'value' element of the arg tuple if the exception

originated from C code; now an exception instance is always provided.

- Issue #17782: Fix undefined behaviour on platforms where

``struct timespec``'s "tv_nsec" member is not a C long.

- Issue #17715: Fix segmentation fault from raising an exception in a __trunc__

method.

- Issue #16447: Fixed potential segmentation fault when setting __name__ on a

class.

- Issue #17669: Fix crash involving finalization of generators using yield from.

- Issue #17619: Make input() check for Ctrl-C correctly on Windows.

- Issue #17610: Don't rely on non-standard behavior of the C qsort() function.

- Issue #17357: Add missing verbosity output when using -v/-vv.

Library

-------

- Issue #17606: Fixed support of encoded byte strings in the XMLGenerator

characters() and ignorableWhitespace() methods. Original patch by Sebastian

Ortiz Vasquez.

- Issue #17732: Ignore distutils.cfg options pertaining to install paths if a

virtual environment is active.

- Issue #1159051: Back out a fix for handling corrupted gzip files that

broke backwards compatibility.

- Issue #17915: Fix interoperability of xml.sax with file objects returned by

codecs.open().

- Issue #16601: Restarting iteration over tarfile no more continues from where

it left off. Patch by Michael Birtwell.

- Issue #17289: The readline module now plays nicer with external modules

or applications changing the rl_completer_word_break_characters global

variable. Initial patch by Bradley Froehle.

- Issue #12181: select module: Fix struct kevent definition on OpenBSD 64-bit

platforms. Patch by Federico Schwindt.

- Issue #14173: Avoid crashing when reading a signal handler during

interpreter shutdown.

- Issue #16316: mimetypes now recognizes the .xz and .txz (.tar.xz) extensions.

- Issue #15902: Fix imp.load_module() accepting None as a file when loading an

extension module.

- Issue #17802: Fix an UnboundLocalError in html.parser. Initial tests by

Thomas Barlow.

- Issue #15535: Fix namedtuple pickles which were picking up the OrderedDict

instead of just the underlying tuple.

- Issue #17192: Restore the patch for Issue #11729 which was ommitted in

3.3.1 when updating the bundled version of libffi used by ctypes. Update

many libffi files that were missed in 3.3.1's update to libffi-3.0.13.

- Issue #17358: Modules loaded by imp.load_source() and load_compiled() (and by

extention load_module()) now have a better chance of working when reloaded.

- Issue #17353: Plistlib emitted empty data tags with deeply nested datastructures

- Issue #11714: Use 'with' statements to assure a Semaphore releases a

condition variable. Original patch by Thomas Rachel.

- Issue #17795: Reverted backwards-incompatible change in SysLogHandler with

Unix domain sockets.

- Issue #17555: Fix ForkAwareThreadLock so that size of after fork

registry does not grow exponentially with generation of process.

- Issue #17707: multiprocessing.Queue's get() method does not block for short

timeouts.

- Isuse #17720: Fix the Python implementation of pickle.Unpickler to correctly

process the APPENDS opcode when it is used on non-list objects.

- Issue #17012: shutil.which() no longer fallbacks to the PATH environment

variable if empty path argument is specified. Patch by Serhiy Storchaka.

- Issue #17710: Fix pickle raising a SystemError on bogus input.

- Issue #17341: Include the invalid name in the error messages from re about

invalid group names.

- Issue #17702: os.environ now raises KeyError with the original environment

variable name (str on UNIX), instead of using the encoded name (bytes on

UNIX).

- Issue #16163: Make the importlib based version of pkgutil.iter_importers

work for submodules. Initial patch by Berker Peksag.

- Issue #16804: Fix a bug in the 'site' module that caused running

'python -S -m site' to incorrectly throw an exception.

- Issue #17016: Get rid of possible pointer wraparounds and integer overflows

in the re module. Patch by Nickolai Zeldovich.

- Issue #16658: add missing return to HTTPConnection.send()

Patch by Jeff Knupp.

- Issue #14971: unittest test discovery no longer gets confused when a function

has a different __name__ than its name in the TestCase class dictionary.

- Issue #17678: Fix DeprecationWarning in the http/cookiejar.py by changing the

usage of get_origin_req_host() to origin_req_host.

- Issue #17666: Fix reading gzip files with an extra field.

- Issue #17502: Process DEFAULT values in mock side_effect that returns iterator.

Patch by Michael Foord.

- Issue #17572: Avoid chained exceptions while passing bad directives to

time.strptime(). Initial patch by Claudiu Popa.

- Issue #17435: threading.Timer's __init__ method no longer uses mutable

default values for the args and kwargs parameters.

- Issue #17526: fix an IndexError raised while passing code without filename to

inspect.findsource(). Initial patch by Tyler Doyle.

- Issue #16550: Update the opcode descriptions of pickletools to use unsigned

integers where appropriate. Initial patch by Serhiy Storchaka.

IDLE

----

- Issue #17838: Allow sys.stdin to be reassigned.

- Issue #13495: Avoid loading the color delegator twice in IDLE.

- Issue #17798: Allow IDLE to edit new files when specified on command line.

- Issue #14735: Update IDLE docs to omit "Control-z on Windows".

- Issue #17585: Fixed IDLE regression. Now closes when using exit() or quit().

- Issue #17657: Show full Tk version in IDLE's about dialog.

Patch by Todd Rovito.

- Issue #17613: Prevent traceback when removing syntax colorizer in IDLE.

- Issue #1207589: Backwards-compatibility patch for right-click menu in IDLE.

- Issue #16887: IDLE now accepts Cancel in tabify/untabify dialog box.

- Issue #17625: In IDLE, close the replace dialog after it is used.

- Issue #14254: IDLE now handles readline correctly across shell restarts.

- Issue #17614: IDLE no longer raises exception when quickly closing a file.

- Issue #6698: IDLE now opens just an editor window when configured to do so.

- Issue #8900: Using keyboard shortcuts in IDLE to open a file no longer

raises an exception.

- Issue #6649: Fixed missing exit status in IDLE. Patch by Guilherme Polo.

Tests

-----

- Issue #17833: Fix test_gdb failures seen on machines where debug symbols

for glibc are available (seen on PPC64 Linux).

- Issue #7855: Add tests for ctypes/winreg for issues found in IronPython.

Initial patch by Dino Viehland.

- Issue #17712: Fix test_gdb failures on Ubuntu 13.04.

- Issue #17835: Fix test_io when the default OS pipe buffer size is larger

than one million bytes.

- Issue #17065: Use process-unique key for winreg tests to avoid failures if

test is run multiple times in parallel (eg: on a buildbot host).

- Issue #12820: add tests for the xml.dom.minicompat module.

Patch by John Chandler and Phil Connell.

- Issue #17790: test_set now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17789: test_random now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17779: test_osx_env now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17766: test_iterlen now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17690: test_time now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17692: test_sqlite now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17843: Removed bz2 test data file that was triggering false-positive

virus warnings with certain antivirus software.

Documentation

-------------

- Issue #15940: Specify effect of locale on time functions.

- Issue #6696: add documentation for the Profile objects, and improve

profile/cProfile docs. Patch by Tom Pinckney.

- Issue #17915: Fix interoperability of xml.sax with file objects returned by

codecs.open().

Build

-----

- Issue #17547: In configure, explicitly pass -Wformat for the benefit for GCC

4.8.

- Issue #17962: Build with OpenSSL 1.0.1e on Windows.

What's New in Python 3.3.1?

===========================

*Release date: 07-Apr-2013*

Build

-----

- Issue #17550: Fix the --enable-profiling configure switch.

IDLE

-------

- Issue #17625: In IDLE, close the replace dialog after it is used.

What's New in Python 3.3.1 release candidate 1?

===============================================

*Release date: 24-Mar-2013*

Core and Builtins

-----------------

- Issue #17328: Fix possible refleak in dict.setdefault.

- Issue #17223: Fix PyUnicode_FromUnicode() for string of 1 character outside

the range U+0000-U+10ffff.

- Issue #1692335: Move initial args assignment to

BaseException.__new__ to help pickling of naive subclasses.

- Issue #17275: Corrected class name in init error messages of the C version of

BufferedWriter and BufferedRandom.

- Issue #7963: Fixed misleading error message that issued when object is

called without arguments.

- Issue #5308: Raise ValueError when marshalling too large object (a sequence

with size >= 2**31), instead of producing illegal marshal data.

- Issue #12983: Bytes literals with invalid \x escape now raise a SyntaxError

and a full traceback including line number.

- Issue #17173: Remove uses of locale-dependent C functions (isalpha() etc.)

in the interpreter.

- Issue #17137: When an Unicode string is resized, the internal wide character

string (wstr) format is now cleared.

- Issue #17043: The unicode-internal decoder no longer read past the end of

input buffer.

- Issue #17098: All modules now have __loader__ set even if they pre-exist the

bootstrapping of importlib.

- Issue #16979: Fix error handling bugs in the unicode-escape-decode decoder.

- Issue #10156: In the interpreter's initialization phase, unicode globals

are now initialized dynamically as needed.

- Issue #16980: Fix processing of escaped non-ascii bytes in the

unicode-escape-decode decoder.

- Issue #16975: Fix error handling bug in the escape-decode bytes decoder.

- Issue #14850: Now a charmap decoder treats U+FFFE as "undefined mapping"

in any mapping, not only in a string.

- Issue #16730: importlib.machinery.FileFinder now no longers raises an

exception when trying to populate its cache and it finds out the directory is

unreadable or has turned into a file. Reported and diagnosed by

David Pritchard.

- Issue #16906: Fix a logic error that prevented most static strings from being

cleared.

- Issue #11461: Fix the incremental UTF-16 decoder. Original patch by

Amaury Forgeot d'Arc.

- Issue #16856: Fix a segmentation fault from calling repr() on a dict with

a key whose repr raise an exception.

- Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB.

- Issue #16455: On FreeBSD and Solaris, if the locale is C, the

ASCII/surrogateescape codec is now used, instead of the locale encoding, to

decode the command line arguments. This change fixes inconsistencies with

os.fsencode() and os.fsdecode() because these operating systems announces an

ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.

- Issue #16761: Calling int() with base argument only now raises TypeError.

- Issue #16759: Support the full DWORD (unsigned long) range in Reg2Py

when retrieving a REG_DWORD value. This corrects functions like

winreg.QueryValueEx that may have been returning truncated values.

- Issue #14420: Support the full DWORD (unsigned long) range in Py2Reg

when passed a REG_DWORD value. Fixes OverflowError in winreg.SetValueEx.

- Issue #16597: In buffered and text IO, call close() on the underlying stream

if invoking flush() fails.

- Issue #16722: In the bytes() constructor, try to call __bytes__ on the

argument before __index__.

- Issue #16602: When a weakref's target was part of a long deallocation

chain, the object could remain reachable through its weakref even though

its refcount had dropped to zero.

- Issue #16416: On Mac OS X, operating system data are now always

encoded/decoded to/from UTF-8/surrogateescape, instead of the locale encoding

(which may be ASCII if no locale environment variable is set), to avoid

inconsistencies with os.fsencode() and os.fsdecode() functions which are

already using UTF-8/surrogateescape.

- Issue #16588: Silence unused-but-set warnings in Python/thread_pthread

- Issue #16546: Fix: ast.YieldFrom argument is now mandatory.

- Issue #16514: Fix regression causing a traceback when sys.path[0] is None

(actually, any non-string or non-bytes type).

- Issue #16306: Fix multiple error messages when unknown command line

parameters where passed to the interpreter. Patch by Hieu Nguyen.

- Issue #16215: Fix potential double memory free in str.replace(). Patch

by Serhiy Storchaka.

- Issue #16453: Fix equality testing of dead weakref objects.

- Issue #9535: Fix pending signals that have been received but not yet

handled by Python to not persist after os.fork() in the child process.

- Issue #15001: fix segfault on "del sys.modules['__main__']". Patch by Victor

Stinner.

- Issue #8271: the utf-8 decoder now outputs the correct number of U+FFFD

characters when used with the 'replace' error handler on invalid utf-8

sequences. Patch by Serhiy Storchaka, tests by Ezio Melotti.

- Issue #5765: Apply a hard recursion limit in the compiler instead of

blowing the stack and segfaulting. Initial patch by Andrea Griffini.

- Issue #16402: When slicing a range, fix shadowing of exceptions from

__index__.

- Issue #16336: fix input checking in the surrogatepass error handler.

Patch by Serhiy Storchaka.

- Issue #8401: assigning an int to a bytearray slice (e.g. b[3:4] = 5) now

raises an error.

- Fix segfaults on setting __qualname__ on builtin types and attempting to

delete it on any type.

- Issue #16345: Fix an infinite loop when ``fromkeys`` on a dict subclass

received a nonempty dict from the constructor.

- Issue #16271: Fix strange bugs that resulted from __qualname__ appearing in a

class's __dict__ and on type.

- Issue #6074: Ensure cached bytecode files can always be updated by the

user that created them, even when the source file is read-only.

- Issue #14783: Improve int() docstring and switch docstrings for str(),

range(), and slice() to use multi-line signatures.

- Issue #16160: Subclass support now works for types.SimpleNamespace.

- Issue #15379: Fix passing of non-BMP characters as integers for the charmap

decoder (already working as unicode strings). Patch by Serhiy Storchaka.

- Issue #15144: Fix possible integer overflow when handling pointers as integer

values, by using `Py_uintptr_t` instead of `size_t`. Patch by Serhiy

Storchaka.

- Issue #15965: Explicitly cast `AT_FDCWD` as (int). Required on Solaris 10

(which defines `AT_FDCWD` as ``0xffd19553``), harmless on other platforms.

- Issue #15839: Convert SystemErrors in `super()` to RuntimeErrors.

- Issue #15846: Fix SystemError which happened when using `ast.parse()` in an

exception handler on code with syntax errors.

- Issue #15801: Make sure mappings passed to '%' formatting are actually

subscriptable.

- Issue #15111: __import__ should let ImportError propagate when a module that

is imported as a side-effect of using fromlist tries to import a module

that cannot be found.

Library

-------

- Issue #17540: Added style to formatter configuration by dict.

- Issue #17536: Add to webbrowser's browser list: www-browser, x-www-browser,

iceweasel, iceape.

- Issue #17488: Change the subprocess.Popen bufsize parameter default value

from unbuffered (0) to buffering (-1) to match the behavior existing code

expects and match the behavior of the subprocess module in Python 2 to avoid

introducing hard to track down bugs.

- Issue #17521: Corrected non-enabling of logger following two calls to

fileConfig().

- Issue #17508: Corrected MemoryHandler configuration in dictConfig() where

the target handler wasn't configured first.

- Issue #17209: curses.window.get_wch() now handles correctly KeyboardInterrupt

(CTRL+c).

- Issue #5713: smtplib now handles 421 (closing connection) error codes when

sending mail by closing the socket and reporting the 421 error code via the

exception appropriate to the command that received the error response.

- Issue #17192: Update the ctypes module's libffi to v3.0.13. This

specifically addresses a stack misalignment issue on x86 and issues on

some more recent platforms.

- Issue #8862: Fixed curses cleanup when getkey is interrputed by a signal.

- Issue #17443: imaplib.IMAP4_stream was using the default unbuffered IO

in subprocess, but the imap code assumes buffered IO. In Python2 this

worked by accident. IMAP4_stream now explicitly uses buffered IO.

- Issue #17476: Fixed regression relative to Python2 in undocumented pydoc

'allmethods'; it was missing unbound methods on the class.

- Issue #16880: Do not assume _imp.load_dynamic() is defined in the imp module.

- Issue #16389: Fixed a performance regression relative to Python 3.1 in the

caching of compiled regular expressions.

- Issue #17431: Fix missing import of BytesFeedParser in email.parser.

- Issue #1285086: Get rid of the refcounting hack and speed up

urllib.parse.unquote() and urllib.parse.unquote_to_bytes().

- Issue #17368: Fix an off-by-one error in the Python JSON decoder that caused

a failure while decoding empty object literals when object_pairs_hook was

specified.

- Issue #14645: The email generator classes now produce output using the

specified linesep throughout. Previously if the prolog, epilog, or

body were stored with a different linesep, that linesep was used. This

fix corrects an RFC non-compliance issue with smtplib.send_message.

- Issue #17278: Fix a crash in heapq.heappush() and heapq.heappop() when

the list is being resized concurrently.

- Issue #16962: Use getdents64 instead of the obsolete getdents syscall

in the subprocess module on Linux.

- Issue #17018: Make Process.join() retry if os.waitpid() fails with EINTR.

- Issue #17223: array module: Fix a crasher when converting an array containing

invalid characters (outside range [U+0000; U+10ffff]) to Unicode:

repr(array), str(array) and array.tounicode(). Patch written by Manuel Jacob.

- Issue #14720: sqlite3: Convert datetime microseconds correctly.

Patch by Lowe Thiderman.

- Issue #17225: JSON decoder now counts columns in the first line starting

with 1, as in other lines.

- Issue #13700: Fix byte/string handling in imaplib authentication when an

authobject is specified.

- Issue #13153: Tkinter functions now raise TclError instead of ValueError when

a string argument contains non-BMP character.

- Issue #9669: Protect re against infinite loops on zero-width matching in

non-greedy repeat. Patch by Matthew Barnett.

- Issue #13169: The maximal repetition number in a regular expression has been

increased from 65534 to 2147483647 (on 32-bit platform) or 4294967294 (on

64-bit).

- Issue #17143: Fix a missing import in the trace module. Initial patch by

Berker Peksag.

- Issue #16743: Fix mmap overflow check on 32 bit Windows.

- Issue #16800: tempfile.gettempdir() no longer left temporary files when

the disk is full. Original patch by Amir Szekely.

- Issue #16564: Fixed regression relative to Python2 in the operation of

email.encoders.encode_7or8bit when used with binary data.

- Issue #17052: unittest discovery should use self.testLoader.

- Issue #4591: Uid and gid values larger than 2**31 are supported now.

- Issue #17141: random.vonmisesvariate() no more hangs for large kappas.

- Issue #17149: Fix random.vonmisesvariate to always return results in

[0, 2*math.pi].

- Issue #1470548: XMLGenerator now works with binary output streams.

- Issue #6975: os.path.realpath() now correctly resolves multiple nested

symlinks on POSIX platforms.

- Issue #16564: Fixed regression relative to Python2 in the operation of

email.encoders.encode_noop when used with binary data.

- Issue #10355: In SpooledTemporaryFile class mode, name, encoding and

newlines properties now work for unrolled files. Obsoleted and never

working on Python 3 xreadline method now removed.

- Issue #16686: Fixed a lot of bugs in audioop module. Fixed crashes in

avgpp(), maxpp() and ratecv(). Fixed an integer overflow in add(), bias(),

and ratecv(). reverse(), lin2lin() and ratecv() no more lose precision for

32-bit samples. max() and rms() no more returns a negative result and

various other functions now work correctly with 32-bit sample -0x80000000.

- Issue #17073: Fix some integer overflows in sqlite3 module.

- Issue #16723: httplib.HTTPResponse no longer marked closed when the connection

is automatically closed.

- Issue #16948: Fix quoted printable body encoding for non-latin1 character

sets in the email package.

- Issue #16811: Fix folding of headers with no value in the provisional email

policies.

- Issue #17132: Update symbol for "yield from" grammar changes.

- Issue #17076: Make copying of xattrs more permissive of missing FS support.

Patch by Thomas Wouters.

- Issue #17089: Expat parser now correctly works with string input not only when

an internal XML encoding is UTF-8 or US-ASCII. It now accepts bytes and

strings larger than 2 GiB.

- Issue #6083: Fix multiple segmentation faults occured when PyArg_ParseTuple

parses nested mutating sequence.

- Issue #5289: Fix ctypes.util.find_library on Solaris.

- Issue #17106: Fix a segmentation fault in io.TextIOWrapper when an underlying

stream or a decoder produces data of an unexpected type (i.e. when

io.TextIOWrapper initialized with text stream or use bytes-to-bytes codec).

- Issue #15633: httplib.HTTPResponse is now mark closed when the server

sends less than the advertised Content-Length.

- Issue #12268: The io module file object write methods no longer abort early

when one of its write system calls is interrupted (EINTR).

- Issue #6972: The zipfile module no longer overwrites files outside of

its destination path when extracting malicious zip files.

- Issue #4844: ZipFile now raises BadZipFile when opens a ZIP file with an

incomplete "End of Central Directory" record. Original patch by Guilherme

Polo and Alan McIntyre.

- Issue #17071: Signature.bind() now works when one of the keyword arguments

is named ``self``.

- Issue #12004: Fix an internal error in PyZipFile when writing an invalid

Python file. Patch by Ben Morgan.

- Issue #1602133: on Mac OS X a shared library build (``--enable-shared``)

now fills the ``os.environ`` variable correctly.

- Issue #15505: `unittest.installHandler` no longer assumes SIGINT handler is

set to a callable object.

- Issue #13454: Fix a crash when deleting an iterator created by itertools.tee()

if all other iterators were very advanced before.

- Issue #12411: Fix to cgi.parse_multipart to correctly use bytes boundaries

and bytes data. Patch by Jonas Wagner.

- Issue #16957: shutil.which() no longer searches a bare file name in the

current directory on Unix and no longer searches a relative file path with

a directory part in PATH directories. Patch by Thomas Kluyver.

- Issue #16993: shutil.which() now preserves the case of the path and extension

on Windows.

- Issue #16992: On Windows in signal.set_wakeup_fd, validate the file

descriptor argument.

- Issue #16422: For compatibility with the Python version, the C version of

decimal now uses strings instead of integers for rounding mode constants.

- Issue #15861: tkinter now correctly works with lists and tuples containing

strings with whitespaces, backslashes or unbalanced braces.

- Issue #10527: Use poll() instead of select() for multiprocessing pipes.

- Issue #9720: zipfile now writes correct local headers for files larger than

4 GiB.

- Issue #16955: Fix the poll() method for multiprocessing's socket

connections on Windows.

- SSLContext.load_dh_params() now properly closes the input file.

- Issue #16900: Issue a ResourceWarning when an ssl socket is left unclosed.

- Issue #13899: \A, \Z, and \B now correctly match the A, Z, and B literals

when used inside character classes (e.g. '[\A]'). Patch by Matthew Barnett.

- Issue #15545: Fix regression in sqlite3's iterdump method where it was

failing if the connection used a row factory (such as sqlite3.Row) that

produced unsortable objects. (Regression was introduced by fix for 9750).

- Issue #15972: Fix error messages when os functions expecting a file name or

file descriptor receive the incorrect type.

- Issue #16828: Fix error incorrectly raised by bz2.compress(b'') and

bz2.BZ2Compressor.compress(b''). Initial patch by Martin Packman.

- Issue #16541: tk_setPalette() now works with keyword arguments.

- Issue #16820: In configparser, `parser.popitem()` no longer raises ValueError.

This makes `parser.clean()` work correctly.

- Issue #16820: In configparser, ``parser['section'] = {}`` now preserves

section order within the parser. This makes `parser.update()` preserve section

order as well.

- Issue #16820: In configparser, ``parser['DEFAULT'] = {}`` now correctly

clears previous values stored in the default section. Same goes for

``parser.update({'DEFAULT': {}})``.

- Issue #9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.

- Issue #10527: make multiprocessing use poll() instead of select() if available.

- Issue #16688: Now regexes contained backreferences correctly work with

non-ASCII strings. Patch by Matthew Barnett.

- Issue #16485: Now file descriptors are closed if file header patching failed

on closing an aifc file.

- Issue #16165: sched.scheduler.run() no longer blocks a scheduler for other

threads.

- Issue #16641: Default values of sched.scheduler.enter() are no longer

modifiable.

- Issue #16618: Make glob.glob match consistently across strings and bytes

regarding leading dots. Patch by Serhiy Storchaka.

- Issue #16713: Parsing of 'tel' urls using urlparse separates params from

path.

- Issue #16443: Add docstrings to regular expression match objects.

Patch by Anton Kasyanov.

- Issue #15701: Fix HTTPError info method call to return the headers information.

- Issue #16752: Add a missing import to modulefinder. Patch by Berker Peksag.

- Issue #16646: ftplib.FTP.makeport() might lose socket error details.

(patch by Serhiy Storchaka)

- Issue #16626: Fix infinite recursion in glob.glob() on Windows when the

pattern contains a wildcard in the drive or UNC path. Patch by Serhiy

Storchaka.

- Issue #15783: Except for the number methods, the C version of decimal now

supports all None default values present in decimal.py. These values were

largely undocumented.

- Issue #16298: In HTTPResponse.read(), close the socket when there is no

Content-Length and the incoming stream is finished. Patch by Eran

Rundstein.

- Issue #15872: Fix 3.3 regression introduced by the new fd-based shutil.rmtree

that caused it to not ignore certain errors when ignore_errors was set.

Patch by Alessandro Moura and Serhiy Storchaka.

- Issue #16248: Disable code execution from the user's home directory by

tkinter when the -E flag is passed to Python. Patch by Zachary Ware.

- Issue #16628: Fix a memory leak in ctypes.resize().

- Issue #13614: Fix setup.py register failure with invalid rst in description.

Patch by Julien Courteau and Pierre Paul Lefebvre.

- Issue #13512: Create ~/.pypirc securely (CVE-2011-4944). Initial patch by

Philip Jenvey, tested by Mageia and Debian.

- Issue #7719: Make distutils ignore ``.nfs*`` files instead of choking later

on. Initial patch by SilentGhost and Jeff Ramnani.

- Issue #13120: Allow to call pdb.set_trace() from thread.

Patch by Ilya Sandler.

- Issue #16585: Make CJK encoders support error handlers that return bytes per

PEP 383.

- Issue #10182: The re module doesn't truncate indices to 32 bits anymore.

Patch by Serhiy Storchaka.

- Issue #16573: In 2to3, treat enumerate() like a consuming call, so superfluous

list() calls aren't added to filter(), map(), and zip() which are directly

passed enumerate().

- Issue #12848: The pure Python pickle implementation now treats object

lengths as unsigned 32-bit integers, like the C implementation does.

Patch by Serhiy Storchaka.

- Issue #16408: Fix file descriptors not being closed in error conditions

in the zipfile module. Patch by Serhiy Storchaka.

- Issue #16481: multiprocessing no longer leaks process handles on Windows.

- Issue #16140: The subprocess module no longer double closes its child

subprocess.PIPE parent file descriptors on child error prior to exec().

- Remove a bare print to stdout from the subprocess module that could have

happened if the child process wrote garbage to its pre-exec error pipe.

- Issue #16327: The subprocess module no longer leaks file descriptors

used for stdin/stdout/stderr pipes to the child when fork() fails.

- Issue #14396: Handle the odd rare case of waitpid returning 0 when not

expected in subprocess.Popen.wait().

- Issue #16411: Fix a bug where zlib.decompressobj().flush() might try to access

previously-freed memory. Patch by Serhiy Storchaka.

- Issue #16357: fix calling accept() on a SSLSocket created through

SSLContext.wrap_socket(). Original patch by Jeff McNeil.

- Issue #16409: The reporthook callback made by the legacy

urllib.request.urlretrieve API now properly supplies a constant non-zero

block_size as it did in Python 3.2 and 2.7. This matches the behavior of

urllib.request.URLopener.retrieve.

- Issue #16431: Use the type information when constructing a Decimal subtype

from a Decimal argument.