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+++++++++++
Python News
+++++++++++
What's New in Python 3.6.0 alpha 1?
===================================
Release date: tba
Core and Builtins
-----------------
- Issue #25709: Fixed problem with in-place string concatenation and utf-8 cache.
- Issue #5319: New Py_FinalizeEx() API allowing Python to set an exit status
of 120 on failure to flush buffered streams.
- Issue #25485: telnetlib.Telnet is now a context manager.
- Issue #24097: Fixed crash in object.__reduce__() if slot name is freed inside
__getattr__.
- Issue #24731: Fixed crash on converting objects with special methods
__bytes__, __trunc__, and __float__ returning instances of subclasses of
bytes, int, and float to subclasses of bytes, int, and float correspondingly.
- Issue #25630: Fix a possible segfault during argument parsing in functions
that accept filesystem paths.
- Issue #23564: Fixed a partially broken sanity check in the _posixsubprocess
internals regarding how fds_to_pass were passed to the child. The bug had
no actual impact as subprocess.py already avoided it.
- Issue #25388: Fixed tokenizer crash when processing undecodable source code
with a null byte.
- Issue #25462: The hash of the key now is calculated only once in most
operations in C implementation of OrderedDict.
- Issue #22995: Default implementation of __reduce__ and __reduce_ex__ now
rejects builtin types with not defined __new__.
- Issue #24802: Avoid buffer overreads when int(), float(), compile(), exec()
and eval() are passed bytes-like objects. These objects are not
necessarily terminated by a null byte, but the functions assumed they were.
- Issue #25555: Fix parser and AST: fill lineno and col_offset of "arg" node
when compiling AST from Python objects.
- Issue #24726: Fixed a crash and leaking NULL in repr() of OrderedDict that
was mutated by direct calls of dict methods.
- Issue #25449: Iterating OrderedDict with keys with unstable hash now raises
KeyError in C implementations as well as in Python implementation.
- Issue #25395: Fixed crash when highly nested OrderedDict structures were
garbage collected.
- Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
between 2x and 3.5x faster.
- Issue #25399: Optimize bytearray % args using the new private _PyBytesWriter
API. Formatting is now between 2.5 and 5 times faster.
- Issue #25274: sys.setrecursionlimit() now raises a RecursionError if the new
recursion limit is too low depending at the current recursion depth. Modify
also the "lower-water mark" formula to make it monotonic. This mark is used
to decide when the overflowed flag of the thread state is reset.
- Issue #24402: Fix input() to prompt to the redirected stdout when
sys.stdout.fileno() fails.
- Issue #25349: Optimize bytes % args using the new private _PyBytesWriter API.
Formatting is now up to 2 times faster.
- Issue #24806: Prevent builtin types that are not allowed to be subclassed from
being subclassed through multiple inheritance.
- Issue #25301: The UTF-8 decoder is now up to 15 times as fast for error
handlers: ``ignore``, ``replace`` and ``surrogateescape``.
- Issue #24848: Fixed a number of bugs in UTF-7 decoding of misformed data.
- Issue #25267: The UTF-8 encoder is now up to 75 times as fast for error
handlers: ``ignore``, ``replace``, ``surrogateescape``, ``surrogatepass``.
Patch co-written with Serhiy Storchaka.
- Issue #25280: Import trace messages emitted in verbose (-v) mode are no
longer formatted twice.
- Issue #25227: Optimize ASCII and latin1 encoders with the ``surrogateescape``
error handler: the encoders are now up to 3 times as fast. Initial patch
written by Serhiy Storchaka.
- Issue #25003: On Solaris 11.3 or newer, os.urandom() now uses the
getrandom() function instead of the getentropy() function. The getentropy()
function is blocking to generate very good quality entropy, os.urandom()
doesn't need such high-quality entropy.
- Issue #9232: Modify Python's grammar to allow trailing commas in the
argument list of a function declaration. For example, "def f(\*, a =
3,): pass" is now legal. Patch from Mark Dickinson.
- Issue #24965: Implement PEP 498 "Literal String Interpolation". This
allows you to embed expressions inside f-strings, which are
converted to normal strings at run time. Given x=3, then
f'value={x}' == 'value=3'. Patch by Eric V. Smith.
Library
-------
- Issue #25638: Optimized ElementTree.iterparse(); it is now 2x faster.
Optimized ElementTree parsing; it is now 10% faster.
- Issue #25761: Improved detecting errors in broken pickle data.
- Issue #25717: Restore the previous behaviour of tolerating most fstat()
errors when opening files. This was a regression in 3.5a1, and stopped
anonymous temporary files from working in special cases.
- Issue #24903: Fix regression in number of arguments compileall accepts when
'-d' is specified. The check on the number of arguments has been dropped
completely as it never worked correctly anyway.
- Issue #25764: In the subprocess module, preserve any exception caused by
fork() failure when preexec_fn is used.
- Issue #25771: Tweak the exception message for importlib.util.resolve_name()
when 'package' isn't specified but necessary.
- Issue #6478: _strptime's regexp cache now is reset after changing timezone
with time.tzset().
- Issue #14285: When executing a package with the "python -m package" option,
and package initialization fails, a proper traceback is now reported. The
"runpy" module now lets exceptions from package initialization pass back to
the caller, rather than raising ImportError.
- Issue #19771: Also in runpy and the "-m" option, omit the irrelevant
message ". . . is a package and cannot be directly executed" if the package
could not even be initialized (e.g. due to a bad *.pyc file).
- Issue #25177: Fixed problem with the mean of very small and very large
numbers. As a side effect, statistics.mean and statistics.variance should
be significantly faster.
- Issue #25718: Fixed copying object with state with boolean value is false.
- Issue #10131: Fixed deep copying of minidom documents. Based on patch
by Marian Ganisin.
- Issue #7990: dir() on ElementTree.Element now lists properties: "tag",
"text", "tail" and "attrib". Original patch by Santoso Wijaya.
- Issue #25725: Fixed a reference leak in pickle.loads() when unpickling
invalid data including tuple instructions.
- Issue #25663: In the Readline completer, avoid listing duplicate global
names, and search the global namespace before searching builtins.
- Issue #25688: Fixed file leak in ElementTree.iterparse() raising an error.
- Issue #23914: Fixed SystemError raised by unpickler on broken pickle data.
- Issue #25691: Fixed crash on deleting ElementTree.Element attributes.
- Issue #25624: ZipFile now always writes a ZIP_STORED header for directory
entries. Patch by Dingyuan Wang.
- Issue #25626: Change three zlib functions to accept sizes that fit in
Py_ssize_t, but internally cap those sizes to UINT_MAX. This resolves a
regression in 3.5 where GzipFile.read() failed to read chunks larger than 2
or 4 GiB. The change affects the zlib.Decompress.decompress() max_length
parameter, the zlib.decompress() bufsize parameter, and the
zlib.Decompress.flush() length parameter.
- Issue #25583: Avoid incorrect errors raised by os.makedirs(exist_ok=True)
when the OS gives priority to errors such as EACCES over EEXIST.
- Issue #25593: Change semantics of EventLoop.stop() in asyncio.
- Issue #6973: When we know a subprocess.Popen process has died, do
not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.
- Issue #23883: Added missing APIs to __all__ to match the documented APIs
for the following modules: csv, enum, ftplib, logging, optparse, threading
and wave. Also added a test.support.check__all__() helper. Patches by
Jacek Kołodziej.
- Issue #25590: In the Readline completer, only call getattr() once per
attribute. Also complete names of attributes such as properties and slots
which are listed by dir() but not yet created on an instance.
- Issue #25498: Fix a crash when garbage-collecting ctypes objects created
by wrapping a memoryview. This was a regression made in 3.5a1. Based
on patch by Eryksun.
- Issue #25584: Added "escape" to the __all__ list in the glob module.
- Issue #25584: Fixed recursive glob() with patterns starting with '\*\*'.
- Issue #25446: Fix regression in smtplib's AUTH LOGIN support.
- Issue #18010: Fix the pydoc web server's module search function to handle
exceptions from importing packages.
- Issue #25554: Got rid of circular references in regular expression parsing.
- Issue #18973: Command-line interface of the calendar module now uses argparse
instead of optparse.
- Issue #25510: fileinput.FileInput.readline() now returns b'' instead of ''
at the end if the FileInput was opened with binary mode.
Patch by Ryosuke Ito.
- Issue #25503: Fixed inspect.getdoc() for inherited docstrings of properties.
Original patch by John Mark Vandenberg.
- Issue #25515: Always use os.urandom as a source of randomness in uuid.uuid4.
- Issue #21827: Fixed textwrap.dedent() for the case when largest common
whitespace is a substring of smallest leading whitespace.
Based on patch by Robert Li.
- Issue #25447: The lru_cache() wrapper objects now can be copied and pickled
(by returning the original object unchanged).
- Issue #25390: typing: Don't crash on Union[str, Pattern].
- Issue #25441: asyncio: Raise error from drain() when socket is closed.
- Issue #25410: Cleaned up and fixed minor bugs in C implementation of
OrderedDict.
- Issue #25411: Improved Unicode support in SMTPHandler through better use of
the email package. Thanks to user simon04 for the patch.
- Move the imp module from a PendingDeprecationWarning to DeprecationWarning.
- Issue #25407: Remove mentions of the formatter module being removed in
Python 3.6.
- Issue #25406: Fixed a bug in C implementation of OrderedDict.move_to_end()
that caused segmentation fault or hang in iterating after moving several
items to the start of ordered dict.
- Issue #25382: pickletools.dis() now outputs implicit memo index for the
MEMOIZE opcode.
- Issue #25357: Add an optional newline paramer to binascii.b2a_base64().
base64.b64encode() uses it to avoid a memory copy.
- Issue #24164: Objects that need calling ``__new__`` with keyword arguments,
can now be pickled using pickle protocols older than protocol version 4.
- Issue #25364: zipfile now works in threads disabled builds.
- Issue #25328: smtpd's SMTPChannel now correctly raises a ValueError if both
decode_data and enable_SMTPUTF8 are set to true.
- Issue #16099: RobotFileParser now supports Crawl-delay and Request-rate
extensions. Patch by Nikolay Bogoychev.
- Issue #25316: distutils raises OSError instead of DistutilsPlatformError
when MSVC is not installed.
- Issue #25380: Fixed protocol for the STACK_GLOBAL opcode in
pickletools.opcodes.
- Issue #23972: Updates asyncio datagram create method allowing reuseport
and reuseaddr socket options to be set prior to binding the socket.
Mirroring the existing asyncio create_server method the reuseaddr option
for datagram sockets defaults to True if the O/S is 'posix' (except if the
platform is Cygwin). Patch by Chris Laws.
- Issue #25304: Add asyncio.run_coroutine_threadsafe(). This lets you
submit a coroutine to a loop from another thread, returning a
concurrent.futures.Future. By Vincent Michel.
- Issue #25232: Fix CGIRequestHandler to split the query from the URL at the
first question mark (?) rather than the last. Patch from Xiang Zhang.
- Issue #24657: Prevent CGIRequestHandler from collapsing slashes in the
query part of the URL as if it were a path. Patch from Xiang Zhang.
- Issue #25287: Don't add crypt.METHOD_CRYPT to crypt.methods if it's not
supported. Check if it is supported, it may not be supported on OpenBSD for
example.
- Issue #23600: Default implementation of tzinfo.fromutc() was returning
wrong results in some cases.
- Issue #25203: Failed readline.set_completer_delims() no longer left the
module in inconsistent state.
- Issue #25011: rlcompleter now omits private and special attribute names unless
the prefix starts with underscores.
- Issue #25209: rlcompleter now can add a space or a colon after completed keyword.
- Issue #22241: timezone.utc name is now plain 'UTC', not 'UTC-00:00'.
- Issue #23517: fromtimestamp() and utcfromtimestamp() methods of
datetime.datetime now round microseconds to nearest with ties going to
nearest even integer (ROUND_HALF_EVEN), as round(float), instead of rounding
towards -Infinity (ROUND_FLOOR).
- Issue #23552: Timeit now warns when there is substantial (4x) variance
between best and worst times. Patch from Serhiy Storchaka.
- Issue #24633: site-packages/README -> README.txt.
- Issue #24879: help() and pydoc can now list named tuple fields in the
order they were defined rather than alphabetically. The ordering is
determined by the _fields attribute if present.
- Issue #24874: Improve speed of itertools.cycle() and make its
pickle more compact.
- Fix crash in itertools.cycle.__setstate__() when the first argument wasn't
a list.
- Issue #20059: urllib.parse raises ValueError on all invalid ports.
Patch by Martin Panter.
- Issue #24360: Improve __repr__ of argparse.Namespace() for invalid
identifiers. Patch by Matthias Bussonnier.
- Issue #23426: run_setup was broken in distutils.
Patch from Alexander Belopolsky.
- Issue #13938: 2to3 converts StringTypes to a tuple. Patch from Mark Hammond.
- Issue #2091: open() accepted a 'U' mode string containing '+', but 'U' can
only be used with 'r'. Patch from Jeff Balogh and John O'Connor.
- Issue #8585: improved tests for zipimporter2. Patch from Mark Lawrence.
- Issue #18622: unittest.mock.mock_open().reset_mock would recurse infinitely.
Patch from Nicola Palumbo and Laurent De Buyst.
- Issue #24426: Fast searching optimization in regular expressions now works
for patterns that starts with capturing groups. Fast searching optimization
now can't be disabled at compile time.
- Issue #23661: unittest.mock side_effects can now be exceptions again. This
was a regression vs Python 3.4. Patch from Ignacio Rossi
- Issue #13248: Remove deprecated inspect.getargspec and inspect.getmoduleinfo
functions.
- Issue #25578: Fix (another) memory leak in SSLSocket.getpeercer().
- Issue #25530: Disable the vulnerable SSLv3 protocol by default when creating
ssl.SSLContext.
- Issue #25569: Fix memory leak in SSLSocket.getpeercert().
- Issue #25471: Sockets returned from accept() shouldn't appear to be
nonblocking.
- Issue #25319: When threading.Event is reinitialized, the underlying condition
should use a regular lock rather than a recursive lock.
IDLE
----
- Issue 15348: Stop the debugger engine (normally in a user process)
before closing the debugger window (running in the IDLE process).
This prevents the RuntimeErrors that were being caught and ignored.
- Issue #24455: Prevent IDLE from hanging when a) closing the shell while the
debugger is active (15347); b) closing the debugger with the [X] button
(15348); and c) activating the debugger when already active (24455).
The patch by Mark Roseman does this by making two changes.
1. Suspend and resume the gui.interaction method with the tcl vwait
mechanism intended for this purpose (instead of root.mainloop & .quit).
2. In gui.run, allow any existing interaction to terminate first.
- Change 'The program' to 'Your program' in an IDLE 'kill program?' message
to make it clearer that the program referred to is the currently running
user program, not IDLE itself.
- Issue #24750: Improve the appearance of the IDLE editor window status bar.
Patch by Mark Roseman.
- Issue #25313: Change the handling of new built-in text color themes to better
address the compatibility problem introduced by the addition of IDLE Dark.
Consistently use the revised idleConf.CurrentTheme everywhere in idlelib.
- Issue #24782: Extension configuration is now a tab in the IDLE Preferences
dialog rather than a separate dialog. The former tabs are now a sorted
list. Patch by Mark Roseman.
- Issue #22726: Re-activate the config dialog help button with some content
about the other buttons and the new IDLE Dark theme.
- Issue #24820: IDLE now has an 'IDLE Dark' built-in text color theme.
It is more or less IDLE Classic inverted, with a cobalt blue background.
Strings, comments, keywords, ... are still green, red, orange, ... .
To use it with IDLEs released before November 2015, hit the
'Save as New Custom Theme' button and enter a new name,
such as 'Custom Dark'. The custom theme will work with any IDLE
release, and can be modified.
- Issue #25224: README.txt is now an idlelib index for IDLE developers and
curious users. The previous user content is now in the IDLE doc chapter.
'IDLE' now means 'Integrated Development and Learning Environment'.
- Issue #24820: Users can now set breakpoint colors in
Settings -> Custom Highlighting. Original patch by Mark Roseman.
- Issue #24972: Inactive selection background now matches active selection
background, as configured by users, on all systems. Found items are now
always highlighted on Windows. Initial patch by Mark Roseman.
- Issue #24570: Idle: make calltip and completion boxes appear on Macs
affected by a tk regression. Initial patch by Mark Roseman.
- Issue #24988: Idle ScrolledList context menus (used in debugger)
now work on Mac Aqua. Patch by Mark Roseman.
- Issue #24801: Make right-click for context menu work on Mac Aqua.
Patch by Mark Roseman.
- Issue #25173: Associate tkinter messageboxes with a specific widget.
For Mac OSX, make them a 'sheet'. Patch by Mark Roseman.
- Issue #25198: Enhance the initial html viewer now used for Idle Help.
* Properly indent fixed-pitch text (patch by Mark Roseman).
* Give code snippet a very Sphinx-like light blueish-gray background.
* Re-use initial width and height set by users for shell and editor.
* When the Table of Contents (TOC) menu is used, put the section header
at the top of the screen.
- Issue #25225: Condense and rewrite Idle doc section on text colors.
- Issue #21995: Explain some differences between IDLE and console Python.
- Issue #22820: Explain need for *print* when running file from Idle editor.
- Issue #25224: Doc: augment Idle feature list and no-subprocess section.
- Issue #25219: Update doc for Idle command line options.
Some were missing and notes were not correct.
- Issue #24861: Most of idlelib is private and subject to change.
Use idleib.idle.* to start Idle. See idlelib.__init__.__doc__.
- Issue #25199: Idle: add synchronization comments for future maintainers.
- Issue #16893: Replace help.txt with help.html for Idle doc display.
The new idlelib/help.html is rstripped Doc/build/html/library/idle.html.
It looks better than help.txt and will better document Idle as released.
The tkinter html viewer that works for this file was written by Rose Roseman.
The now unused EditorWindow.HelpDialog class and helt.txt file are deprecated.
- Issue #24199: Deprecate unused idlelib.idlever with possible removal in 3.6.
- Issue #24790: Remove extraneous code (which also create 2 & 3 conflicts).
Documentation
-------------
- Issue #24952: Clarify the default size argument of stack_size() in
the "threading" and "_thread" modules. Patch from Mattip.
Tests
-----
- Issue #25616: Tests for OrderedDict are extracted from test_collections
into separate file test_ordered_dict.
- Issue #25449: Added tests for OrderedDict subclasses.
- Issue #25188: Add -P/--pgo to test.regrtest to suppress error output when
running the test suite for the purposes of a PGO build. Initial patch by
Alecsandru Patrascu.
- Issue #22806: Add ``python -m test --list-tests`` command to list tests.
- Issue #18174: ``python -m test --huntrleaks ...`` now also checks for leak of
file descriptors. Patch written by Richard Oudkerk.
- Issue #25260: Fix ``python -m test --coverage`` on Windows. Remove the
list of ignored directories.
- ``PCbuild\rt.bat`` now accepts an unlimited number of arguments to pass along
to regrtest.py. Previously there was a limit of 9.
Build
-----
- Issue #25696: Fix installation of Python on UNIX with make -j9.
- Issue #24986: It is now possible to build Python on Windows without errors
when external libraries are not available.
- Issue #25798: Update OS X 10.5 installer to use OpenSSL 1.0.2e.
Windows
-------
- Issue #25022: Removed very outdated PC/example_nt/ directory.
Tools/Demos
-----------
- Issue #25440: Fix output of python-config --extension-suffix.
- Issue #25154: The pyvenv script has been deprecated in favour of
`python3 -m venv`.
What's New in Python 3.5.1 final?
=================================
Release date: 2015-12-06
Core and Builtins
-----------------
- Issue #25709: Fixed problem with in-place string concatenation and
utf-8 cache.
Windows
-------
- Issue #25715: Python 3.5.1 installer shows wrong upgrade path and incorrect
logic for launcher detection.
What's New in Python 3.5.1 release candidate 1?
===============================================
Release date: 2015-11-22
Core and Builtins
-----------------
- Issue #25630: Fix a possible segfault during argument parsing in functions
that accept filesystem paths.
- Issue #23564: Fixed a partially broken sanity check in the _posixsubprocess
internals regarding how fds_to_pass were passed to the child. The bug had
no actual impact as subprocess.py already avoided it.
- Issue #25388: Fixed tokenizer crash when processing undecodable source code
with a null byte.
- Issue #25462: The hash of the key now is calculated only once in most
operations in C implementation of OrderedDict.
- Issue #22995: Default implementation of __reduce__ and __reduce_ex__ now
rejects builtin types with not defined __new__.
- Issue #25555: Fix parser and AST: fill lineno and col_offset of "arg" node
when compiling AST from Python objects.
- Issue #24802: Avoid buffer overreads when int(), float(), compile(), exec()
and eval() are passed bytes-like objects. These objects are not
necessarily terminated by a null byte, but the functions assumed they were.
- Issue #24726: Fixed a crash and leaking NULL in repr() of OrderedDict that
was mutated by direct calls of dict methods.
- Issue #25449: Iterating OrderedDict with keys with unstable hash now raises
KeyError in C implementations as well as in Python implementation.
- Issue #25395: Fixed crash when highly nested OrderedDict structures were
garbage collected.
- Issue #25274: sys.setrecursionlimit() now raises a RecursionError if the new
recursion limit is too low depending at the current recursion depth. Modify
also the "lower-water mark" formula to make it monotonic. This mark is used
to decide when the overflowed flag of the thread state is reset.
- Issue #24402: Fix input() to prompt to the redirected stdout when
sys.stdout.fileno() fails.
- Issue #24806: Prevent builtin types that are not allowed to be subclassed from
being subclassed through multiple inheritance.
- Issue #24848: Fixed a number of bugs in UTF-7 decoding of misformed data.
- Issue #25280: Import trace messages emitted in verbose (-v) mode are no
longer formatted twice.
- Issue #25003: On Solaris 11.3 or newer, os.urandom() now uses the
getrandom() function instead of the getentropy() function. The getentropy()
function is blocking to generate very good quality entropy, os.urandom()
doesn't need such high-quality entropy.
- Issue #25182: The stdprinter (used as sys.stderr before the io module is
imported at startup) now uses the backslashreplace error handler.
- Issue #25131: Make the line number and column offset of set/dict literals and
comprehensions correspond to the opening brace.
- Issue #25150: Hide the private _Py_atomic_xxx symbols from the public
Python.h header to fix a compilation error with OpenMP. PyThreadState_GET()
becomes an alias to PyThreadState_Get() to avoid ABI incompatibilies.
Library
-------
- Issue #25626: Change three zlib functions to accept sizes that fit in
Py_ssize_t, but internally cap those sizes to UINT_MAX. This resolves a
regression in 3.5 where GzipFile.read() failed to read chunks larger than 2
or 4 GiB. The change affects the zlib.Decompress.decompress() max_length
parameter, the zlib.decompress() bufsize parameter, and the
zlib.Decompress.flush() length parameter.
- Issue #25583: Avoid incorrect errors raised by os.makedirs(exist_ok=True)
when the OS gives priority to errors such as EACCES over EEXIST.
- Issue #25593: Change semantics of EventLoop.stop() in asyncio.
- Issue #6973: When we know a subprocess.Popen process has died, do
not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.
- Issue #25590: In the Readline completer, only call getattr() once per
attribute.
- Issue #25498: Fix a crash when garbage-collecting ctypes objects created
by wrapping a memoryview. This was a regression made in 3.5a1. Based
on patch by Eryksun.
- Issue #25584: Added "escape" to the __all__ list in the glob module.
- Issue #25584: Fixed recursive glob() with patterns starting with '\*\*'.
- Issue #25446: Fix regression in smtplib's AUTH LOGIN support.
- Issue #18010: Fix the pydoc web server's module search function to handle
exceptions from importing packages.
- Issue #25554: Got rid of circular references in regular expression parsing.
- Issue #25510: fileinput.FileInput.readline() now returns b'' instead of ''
at the end if the FileInput was opened with binary mode.
Patch by Ryosuke Ito.
- Issue #25503: Fixed inspect.getdoc() for inherited docstrings of properties.
Original patch by John Mark Vandenberg.
- Issue #25515: Always use os.urandom as a source of randomness in uuid.uuid4.
- Issue #21827: Fixed textwrap.dedent() for the case when largest common
whitespace is a substring of smallest leading whitespace.
Based on patch by Robert Li.
- Issue #25447: The lru_cache() wrapper objects now can be copied and pickled
(by returning the original object unchanged).
- Issue #25390: typing: Don't crash on Union[str, Pattern].
- Issue #25441: asyncio: Raise error from drain() when socket is closed.
- Issue #25410: Cleaned up and fixed minor bugs in C implementation of
OrderedDict.
- Issue #25411: Improved Unicode support in SMTPHandler through better use of
the email package. Thanks to user simon04 for the patch.
- Issue #25407: Remove mentions of the formatter module being removed in
Python 3.6.
- Issue #25406: Fixed a bug in C implementation of OrderedDict.move_to_end()
that caused segmentation fault or hang in iterating after moving several
items to the start of ordered dict.
- Issue #25364: zipfile now works in threads disabled builds.
- Issue #25328: smtpd's SMTPChannel now correctly raises a ValueError if both
decode_data and enable_SMTPUTF8 are set to true.
- Issue #25316: distutils raises OSError instead of DistutilsPlatformError
when MSVC is not installed.
- Issue #25380: Fixed protocol for the STACK_GLOBAL opcode in
pickletools.opcodes.
- Issue #23972: Updates asyncio datagram create method allowing reuseport
and reuseaddr socket options to be set prior to binding the socket.
Mirroring the existing asyncio create_server method the reuseaddr option
for datagram sockets defaults to True if the O/S is 'posix' (except if the
platform is Cygwin). Patch by Chris Laws.
- Issue #25304: Add asyncio.run_coroutine_threadsafe(). This lets you
submit a coroutine to a loop from another thread, returning a
concurrent.futures.Future. By Vincent Michel.
- Issue #25232: Fix CGIRequestHandler to split the query from the URL at the
first question mark (?) rather than the last. Patch from Xiang Zhang.
- Issue #24657: Prevent CGIRequestHandler from collapsing slashes in the
query part of the URL as if it were a path. Patch from Xiang Zhang.
- Issue #24483: C implementation of functools.lru_cache() now calculates key's
hash only once.
- Issue #22958: Constructor and update method of weakref.WeakValueDictionary
now accept the self and the dict keyword arguments.
- Issue #22609: Constructor of collections.UserDict now accepts the self keyword
argument.
- Issue #25111: Fixed comparison of traceback.FrameSummary.
- Issue #25262. Added support for BINBYTES8 opcode in Python implementation of
unpickler. Highest 32 bits of 64-bit size for BINUNICODE8 and BINBYTES8
opcodes no longer silently ignored on 32-bit platforms in C implementation.
- Issue #25034: Fix string.Formatter problem with auto-numbering and
nested format_specs. Patch by Anthon van der Neut.
- Issue #25233: Rewrite the guts of asyncio.Queue and
asyncio.Semaphore to be more understandable and correct.
- Issue #25203: Failed readline.set_completer_delims() no longer left the
module in inconsistent state.
- Issue #23600: Default implementation of tzinfo.fromutc() was returning
wrong results in some cases.
- Issue #23329: Allow the ssl module to be built with older versions of
LibreSSL.
- Prevent overflow in _Unpickler_Read.
- Issue #25047: The XML encoding declaration written by Element Tree now
respects the letter case given by the user. This restores the ability to
write encoding names in uppercase like "UTF-8", which worked in Python 2.
- Issue #25135: Make deque_clear() safer by emptying the deque before clearing.
This helps avoid possible reentrancy issues.
- Issue #19143: platform module now reads Windows version from kernel32.dll to
avoid compatibility shims.
- Issue #25092: Fix datetime.strftime() failure when errno was already set to
EINVAL.
- Issue #23517: Fix rounding in fromtimestamp() and utcfromtimestamp() methods
of datetime.datetime: microseconds are now rounded to nearest with ties
going to nearest even integer (ROUND_HALF_EVEN), instead of being rounding
towards minus infinity (ROUND_FLOOR). It's important that these methods use
the same rounding mode than datetime.timedelta to keep the property:
(datetime(1970,1,1) + timedelta(seconds=t)) == datetime.utcfromtimestamp(t).
It also the rounding mode used by round(float) for example.
- Issue #25155: Fix datetime.datetime.now() and datetime.datetime.utcnow() on
Windows to support date after year 2038. It was a regression introduced in
Python 3.5.0.
- Issue #25108: Omitted internal frames in traceback functions print_stack(),
format_stack(), and extract_stack() called without arguments.
- Issue #25118: Fix a regression of Python 3.5.0 in os.waitpid() on Windows.
- Issue #24684: socket.socket.getaddrinfo() now calls
PyUnicode_AsEncodedString() instead of calling the encode() method of the
host, to handle correctly custom string with an encode() method which doesn't
return a byte string. The encoder of the IDNA codec is now called directly
instead of calling the encode() method of the string.
- Issue #25060: Correctly compute stack usage of the BUILD_MAP opcode.
- Issue #24857: Comparing call_args to a long sequence now correctly returns a
boolean result instead of raising an exception. Patch by A Kaptur.
- Issue #23144: Make sure that HTMLParser.feed() returns all the data, even
when convert_charrefs is True.
- Issue #24982: shutil.make_archive() with the "zip" format now adds entries
for directories (including empty directories) in ZIP file.
- Issue #25019: Fixed a crash caused by setting non-string key of expat parser.
Based on patch by John Leitch.
- Issue #16180: Exit pdb if file has syntax error, instead of trapping user
in an infinite loop. Patch by Xavier de Gaye.
- Issue #24891: Fix a race condition at Python startup if the file descriptor
of stdin (0), stdout (1) or stderr (2) is closed while Python is creating
sys.stdin, sys.stdout and sys.stderr objects. These attributes are now set
to None if the creation of the object failed, instead of raising an OSError
exception. Initial patch written by Marco Paolini.
- Issue #24992: Fix error handling and a race condition (related to garbage
collection) in collections.OrderedDict constructor.
- Issue #24881: Fixed setting binary mode in Python implementation of FileIO
on Windows and Cygwin. Patch from Akira Li.
- Issue #25578: Fix (another) memory leak in SSLSocket.getpeercer().
- Issue #25530: Disable the vulnerable SSLv3 protocol by default when creating
ssl.SSLContext.
- Issue #25569: Fix memory leak in SSLSocket.getpeercert().
- Issue #25471: Sockets returned from accept() shouldn't appear to be
nonblocking.
- Issue #25319: When threading.Event is reinitialized, the underlying condition
should use a regular lock rather than a recursive lock.
- Issue #21112: Fix regression in unittest.expectedFailure on subclasses.
Patch from Berker Peksag.
- Issue #24764: cgi.FieldStorage.read_multi() now ignores the Content-Length
header in part headers. Patch written by Peter Landry and reviewed by Pierre
Quentel.
- Issue #24913: Fix overrun error in deque.index().
Found by John Leitch and Bryce Darling.
- Issue #24774: Fix docstring in http.server.test. Patch from Chiu-Hsiang Hsu.
- Issue #21159: Improve message in configparser.InterpolationMissingOptionError.
Patch from Łukasz Langa.
- Issue #20362: Honour TestCase.longMessage correctly in assertRegex.
Patch from Ilia Kurenkov.
- Issue #23572: Fixed functools.singledispatch on classes with falsy
metaclasses. Patch by Ethan Furman.
- asyncio: ensure_future() now accepts awaitable objects.
IDLE
----
- Issue 15348: Stop the debugger engine (normally in a user process)
before closing the debugger window (running in the IDLE process).
This prevents the RuntimeErrors that were being caught and ignored.
- Issue #24455: Prevent IDLE from hanging when a) closing the shell while the
debugger is active (15347); b) closing the debugger with the [X] button
(15348); and c) activating the debugger when already active (24455).
The patch by Mark Roseman does this by making two changes.
1. Suspend and resume the gui.interaction method with the tcl vwait
mechanism intended for this purpose (instead of root.mainloop & .quit).
2. In gui.run, allow any existing interaction to terminate first.
- Change 'The program' to 'Your program' in an IDLE 'kill program?' message
to make it clearer that the program referred to is the currently running
user program, not IDLE itself.
- Issue #24750: Improve the appearance of the IDLE editor window status bar.
Patch by Mark Roseman.
- Issue #25313: Change the handling of new built-in text color themes to better
address the compatibility problem introduced by the addition of IDLE Dark.
Consistently use the revised idleConf.CurrentTheme everywhere in idlelib.
- Issue #24782: Extension configuration is now a tab in the IDLE Preferences
dialog rather than a separate dialog. The former tabs are now a sorted
list. Patch by Mark Roseman.
- Issue #22726: Re-activate the config dialog help button with some content
about the other buttons and the new IDLE Dark theme.
- Issue #24820: IDLE now has an 'IDLE Dark' built-in text color theme.
It is more or less IDLE Classic inverted, with a cobalt blue background.
Strings, comments, keywords, ... are still green, red, orange, ... .
To use it with IDLEs released before November 2015, hit the
'Save as New Custom Theme' button and enter a new name,
such as 'Custom Dark'. The custom theme will work with any IDLE
release, and can be modified.
- Issue #25224: README.txt is now an idlelib index for IDLE developers and
curious users. The previous user content is now in the IDLE doc chapter.
'IDLE' now means 'Integrated Development and Learning Environment'.
- Issue #24820: Users can now set breakpoint colors in
Settings -> Custom Highlighting. Original patch by Mark Roseman.
- Issue #24972: Inactive selection background now matches active selection
background, as configured by users, on all systems. Found items are now
always highlighted on Windows. Initial patch by Mark Roseman.
- Issue #24570: Idle: make calltip and completion boxes appear on Macs
affected by a tk regression. Initial patch by Mark Roseman.
- Issue #24988: Idle ScrolledList context menus (used in debugger)
now work on Mac Aqua. Patch by Mark Roseman.
- Issue #24801: Make right-click for context menu work on Mac Aqua.
Patch by Mark Roseman.
- Issue #25173: Associate tkinter messageboxes with a specific widget.
For Mac OSX, make them a 'sheet'. Patch by Mark Roseman.
- Issue #25198: Enhance the initial html viewer now used for Idle Help.
* Properly indent fixed-pitch text (patch by Mark Roseman).
* Give code snippet a very Sphinx-like light blueish-gray background.
* Re-use initial width and height set by users for shell and editor.
* When the Table of Contents (TOC) menu is used, put the section header
at the top of the screen.
- Issue #25225: Condense and rewrite Idle doc section on text colors.
- Issue #21995: Explain some differences between IDLE and console Python.
- Issue #22820: Explain need for *print* when running file from Idle editor.
- Issue #25224: Doc: augment Idle feature list and no-subprocess section.
- Issue #25219: Update doc for Idle command line options.
Some were missing and notes were not correct.
- Issue #24861: Most of idlelib is private and subject to change.
Use idleib.idle.* to start Idle. See idlelib.__init__.__doc__.
- Issue #25199: Idle: add synchronization comments for future maintainers.
- Issue #16893: Replace help.txt with help.html for Idle doc display.
The new idlelib/help.html is rstripped Doc/build/html/library/idle.html.
It looks better than help.txt and will better document Idle as released.
The tkinter html viewer that works for this file was written by Mark Roseman.
The now unused EditorWindow.HelpDialog class and helt.txt file are deprecated.
- Issue #24199: Deprecate unused idlelib.idlever with possible removal in 3.6.
- Issue #24790: Remove extraneous code (which also create 2 & 3 conflicts).
Documentation
-------------
- Issue #12067: Rewrite Comparisons section in the Expressions chapter of the
language reference. Some of the details of comparing mixed types were
incorrect or ambiguous. NotImplemented is only relevant at a lower level
than the Expressions chapter. Added details of comparing range() objects,
and default behaviour and consistency suggestions for user-defined classes.
Patch from Andy Maier.
- Issue #24952: Clarify the default size argument of stack_size() in
the "threading" and "_thread" modules. Patch from Mattip.
- Issue #23725: Overhaul tempfile docs. Note deprecated status of mktemp.
Patch from Zbigniew Jędrzejewski-Szmek.
- Issue #24808: Update the types of some PyTypeObject fields. Patch by
Joseph Weston.
- Issue #22812: Fix unittest discovery examples.
Patch from Pam McA'Nulty.
Tests
-----
- Issue #25449: Added tests for OrderedDict subclasses.
- Issue #25099: Make test_compileall not fail when an entry on sys.path cannot
be written to (commonly seen in administrative installs on Windows).
- Issue #23919: Prevents assert dialogs appearing in the test suite.
- ``PCbuild\rt.bat`` now accepts an unlimited number of arguments to pass along
to regrtest.py. Previously there was a limit of 9.
Build
-----
- Issue #24915: Add LLVM support for PGO builds and use the test suite to
generate the profile data. Initial patch by Alecsandru Patrascu of Intel.
- Issue #24910: Windows MSIs now have unique display names.
- Issue #24986: It is now possible to build Python on Windows without errors
when external libraries are not available.
Windows
-------
- Issue #25450: Updates shortcuts to start Python in installation directory.
- Issue #25164: Changes default all-users install directory to match per-user
directory.
- Issue #25143: Improves installer error messages for unsupported platforms.
- Issue #25163: Display correct directory in installer when using non-default
settings.
- Issue #25361: Disables use of SSE2 instructions in Windows 32-bit build
- Issue #25089: Adds logging to installer for case where launcher is not
selected on upgrade.
- Issue #25165: Windows uninstallation should not remove launcher if other
versions remain
- Issue #25112: py.exe launcher is missing icons