库

• bpo-35845 [https://bugs.python.org/issue?@action=redirect&bpo=35845]: Add 'order' parameter to memoryview.tobytes().

• bpo-35864 [https://bugs.python.org/issue?@action=redirect&bpo=35864]: The _asdict() method for collections.namedtuple now returns a regular dict instead of an OrderedDict.

• bpo-35537 [https://bugs.python.org/issue?@action=redirect&bpo=35537]: An ExitStack is now used internally within subprocess.Popen to clean up pipe file handles. No behavior change in normal operation. But if closing one handle were ever to cause an exception, the others will now be closed instead of leaked. (patch by Giampaolo Rodola)

• bpo-35847 [https://bugs.python.org/issue?@action=redirect&bpo=35847]: RISC-V needed the CTYPES_PASS_BY_REF_HACK. Fixes ctypes Structure test_pass_by_value.

• bpo-35813 [https://bugs.python.org/issue?@action=redirect&bpo=35813]: Shared memory submodule added to multiprocessing to avoid need for serialization between processes

• bpo-35780 [https://bugs.python.org/issue?@action=redirect&bpo=35780]: Fix lru_cache() errors arising in recursive, reentrant, or multithreaded code. These errors could result in orphan links and in the cache being trapped in a state with fewer than the specified maximum number of links. Fix handling of negative maxsize which should have been treated as zero. Fix errors in toggling the "full" status flag. Fix misordering of links when errors are encountered. Sync-up the C code and pure Python code for the space saving path in functions with a single positional argument. In this common case, the space overhead of an lru cache entry is reduced by almost half. Fix counting of cache misses. In error cases, the miss count was out of sync with the actual number of times the underlying user function was called.

• bpo-35537 [https://bugs.python.org/issue?@action=redirect&bpo=35537]: os.posix_spawn() and os.posix_spawnp() now have a setsid parameter.

• bpo-23846 [https://bugs.python.org/issue?@action=redirect&bpo=23846]: asyncio.ProactorEventLoop now catches and logs send errors when the self-pipe is full.

• bpo-34323 [https://bugs.python.org/issue?@action=redirect&bpo=34323]: asyncio: Enhance IocpProactor.close() log: wait 1 second before the first log, then log every second. Log also the number of seconds since close() was called.

• bpo-35674 [https://bugs.python.org/issue?@action=redirect&bpo=35674]: Add a new os.posix_spawnp() function. Patch by Joannah Nanjekye.

• bpo-35733 [https://bugs.python.org/issue?@action=redirect&bpo=35733]: ast.Constant(boolean) no longer an instance of ast.Num. Patch by Anthony Sottile.

• bpo-35726 [https://bugs.python.org/issue?@action=redirect&bpo=35726]: QueueHandler.prepare() now makes a copy of the record before modifying and enqueueing it, to avoid affecting other handlers in the chain.

• bpo-35719 [https://bugs.python.org/issue?@action=redirect&bpo=35719]: Sped up multi-argument math functions atan2(), copysign(), remainder() and hypot() by 1.3—2.5 times.

• bpo-35717 [https://bugs.python.org/issue?@action=redirect&bpo=35717]: Fix KeyError exception raised when using enums and compile. Patch contributed by Rémi Lapeyre.

• bpo-35699 [https://bugs.python.org/issue?@action=redirect&bpo=35699]: Fixed detection of Visual Studio Build Tools 2017 in distutils

• bpo-32710 [https://bugs.python.org/issue?@action=redirect&bpo=32710]: Fix memory leaks in asyncio ProactorEventLoop on overlapped operation failure.

• bpo-35702 [https://bugs.python.org/issue?@action=redirect&bpo=35702]: The time.CLOCK_UPTIME_RAW constant is now available for macOS 10.12.

• bpo-32710 [https://bugs.python.org/issue?@action=redirect&bpo=32710]: Fix a memory leak in asyncio in the ProactorEventLoop when ReadFile() or WSASend() overlapped operation fail immediately: release the internal buffer.

• bpo-35682 [https://bugs.python.org/issue?@action=redirect&bpo=35682]: Fix asyncio.ProactorEventLoop.sendfile(): don't attempt to set the result of an internal future if it's already done.

• bpo-35283 [https://bugs.python.org/issue?@action=redirect&bpo=35283]: Add a deprecated warning for the threading.Thread.isAlive() method. Patch by Donghee Na.

• bpo-35664 [https://bugs.python.org/issue?@action=redirect&bpo=35664]: Improve operator.itemgetter() performance by 33% with optimized argument handling and with adding a fast path for the common case of a single non-negative integer index into a tuple (which is the typical use case in the standard library).

• bpo-35643 [https://bugs.python.org/issue?@action=redirect&bpo=35643]: Fixed a SyntaxWarning: invalid escape sequence in Modules/_sha3/cleanup.py. Patch by Mickaël Schoentgen.

• bpo-35619 [https://bugs.python.org/issue?@action=redirect&bpo=35619]: Improved support of custom data descriptors in help() and pydoc.

• bpo-28503 [https://bugs.python.org/issue?@action=redirect&bpo=28503]: The crypt module now internally uses the crypt_r() library function instead of crypt() when available.

• bpo-35614 [https://bugs.python.org/issue?@action=redirect&bpo=35614]: Fixed help() on metaclasses. Patch by Sanyam Khurana.

• bpo-35568 [https://bugs.python.org/issue?@action=redirect&bpo=35568]: Expose raise(signum) as raise_signal

• bpo-35588 [https://bugs.python.org/issue?@action=redirect&bpo=35588]: The floor division and modulo operations and the divmod() function on fractions.Fraction types are 2—4x faster. Patch by Stefan Behnel.

• bpo-35585 [https://bugs.python.org/issue?@action=redirect&bpo=35585]: Speedup building enums by value, e.g. http.HTTPStatus(200).

• bpo-30561 [https://bugs.python.org/issue?@action=redirect&bpo=30561]: random.gammavariate(1.0, beta) now computes the same result as random.expovariate(1.0 / beta). This synchronizes the two algorithms and eliminates some idiosyncrasies in the old implementation. It does however produce a difference stream of random variables than it used to.

• bpo-35537 [https://bugs.python.org/issue?@action=redirect&bpo=35537]: The subprocess module can now use the os.posix_spawn() function in some cases for better performance.

• bpo-35526 [https://bugs.python.org/issue?@action=redirect&bpo=35526]: Delaying the 'joke' of barryasFLUFL.mandatory to Python version 4.0

• bpo-35523 [https://bugs.python.org/issue?@action=redirect&bpo=35523]: Remove ctypes callback workaround: no longer create a callback at startup. Avoid SELinux alert on import ctypes and import uuid.

• bpo-31784 [https://bugs.python.org/issue?@action=redirect&bpo=31784]: uuid.uuid1() now calls time.time_ns() rather than int(time.time() * 1e9).

• bpo-35513 [https://bugs.python.org/issue?@action=redirect&bpo=35513]: TextTestRunner of unittest.runner now uses time.perf_counter() rather than time.time() to measure the execution time of a test: time.time() can go backwards, whereas time.perf_counter() is monotonic.

• bpo-35502 [https://bugs.python.org/issue?@action=redirect&bpo=35502]: Fixed reference leaks in xml.etree.ElementTree.TreeBuilder in case of unfinished building of the tree (in particular when an error was raised during parsing XML).

• bpo-35348 [https://bugs.python.org/issue?@action=redirect&bpo=35348]: Make platform.architecture() parsing of file command output more reliable: add the -b option to the file command to omit the filename, force the usage of the C locale, and search also the "shared object" pattern.

• bpo-35491 [https://bugs.python.org/issue?@action=redirect&bpo=35491]: multiprocessing: Add Pool._repr_() and enhance BaseProcess._repr_() (add pid and parent pid) to ease debugging. Pool state constant values are now strings instead of integers, for example RUN value becomes 'RUN' instead of 0.

• bpo-35477 [https://bugs.python.org/issue?@action=redirect&bpo=35477]: multiprocessing.Pool.__enter__() now fails if the pool is not running: with pool: fails if used more than once.

• bpo-31446 [https://bugs.python.org/issue?@action=redirect&bpo=31446]: Copy command line that was passed to CreateProcessW since this function can change the content of the input buffer.

• bpo-35471 [https://bugs.python.org/issue?@action=redirect&bpo=35471]: Python 2.4 dropped MacOS 9 support. The macpath module was deprecated in Python 3.7. The module is now removed.

• bpo-23057 [https://bugs.python.org/issue?@action=redirect&bpo=23057]: Unblock Proactor event loop when keyboard interrupt is received on Windows

• bpo-35052 [https://bugs.python.org/issue?@action=redirect&bpo=35052]: Fix xml.dom.minidom cloneNode() on a document with an entity: pass the correct arguments to the user data handler of an entity.

• bpo-20239 [https://bugs.python.org/issue?@action=redirect&bpo=20239]: Allow repeated assignment deletion of unittest.mock.Mock attributes. Patch by Pablo Galindo.

• bpo-17185 [https://bugs.python.org/issue?@action=redirect&bpo=17185]: Set _signature_ on mock for inspect to get signature. Patch by Karthikeyan Singaravelan.

• bpo-35445 [https://bugs.python.org/issue?@action=redirect&bpo=35445]: Memory errors during creating posix.environ no longer ignored.

• bpo-35415 [https://bugs.python.org/issue?@action=redirect&bpo=35415]: Validate fileno= argument to socket.socket().

• bpo-35424 [https://bugs.python.org/issue?@action=redirect&bpo=35424]: multiprocessing.Pool destructor now emits ResourceWarning if the pool is still running.

• bpo-35330 [https://bugs.python.org/issue?@action=redirect&bpo=35330]: When a Mock instance was used to wrap an object, if side_effect is used in one of the mocks of it methods, don't call the original implementation and return the result of using the side effect the same way that it is done with return_value.

• bpo-35346 [https://bugs.python.org/issue?@action=redirect&bpo=35346]: Drop Mac OS 9 and Rhapsody support from the platform module. Rhapsody last release was in 2000. Mac OS 9 last release was in 2001.

• bpo-10496 [https://bugs.python.org/issue?@action=redirect&bpo=10496]: check_environ() of distutils.utils now catches KeyError on calling pwd.getpwuid(): don't create the HOME environment variable in this case.

• bpo-10496 [https://bugs.python.org/issue?@action=redirect&bpo=10496]: posixpath.expanduser() now returns the input path unchanged if the HOME environment variable is not set and the current user has no home directory (if the current user identifier doesn't exist in the password database). This change fix the site module if the current user doesn't exist in the password database (if the user has no home directory).

• bpo-35389 [https://bugs.python.org/issue?@action=redirect&bpo=35389]: platform.libc_ver() now uses os.confstr('CS_GNU_LIBC_VERSION') if available and the executable parameter is not set.

• bpo-35394 [https://bugs.python.org/issue?@action=redirect&bpo=35394]: Add empty slots to asyncio abstract protocols.

• bpo-35310 [https://bugs.python.org/issue?@action=redirect&bpo=35310]: Fix a bug in select.select() where, in some cases, the file descriptor sequences were returned unmodified after a signal interruption, even though the file descriptors might not be ready yet. select.select() will now always return empty lists if a timeout has occurred. Patch by Oran Avraham.

• bpo-35380 [https://bugs.python.org/issue?@action=redirect&bpo=35380]: Enable TCP_NODELAY on Windows for proactor asyncio event loop.

• bpo-35341 [https://bugs.python.org/issue?@action=redirect&bpo=35341]: Add generic version of collections.OrderedDict to the typing module. Patch by Ismo Toijala.

• bpo-35371 [https://bugs.python.org/issue?@action=redirect&bpo=35371]: Fixed possible crash in os.utime() on Windows when pass incorrect arguments.

• bpo-35346 [https://bugs.python.org/issue?@action=redirect&bpo=35346]: platform.uname() now redirects stderr to os.devnull when running external programs like cmd /c ver.

• bpo-35066 [https://bugs.python.org/issue?@action=redirect&bpo=35066]: Previously, calling the strftime() method on a datetime object with a trailing '%' in the format string would result in an exception. However, this only occurred when the datetime C module was being used; the python implementation did not match this behavior. Datetime is now PEP-399 compliant, and will not throw an exception on a trailing '%'.

• bpo-35345 [https://bugs.python.org/issue?@action=redirect&bpo=35345]: The function platform.popen has been removed, it was deprecated since Python 3.3: use os.popen() instead.

• bpo-35344 [https://bugs.python.org/issue?@action=redirect&bpo=35344]: On macOS, platform.platform() now uses platform.mac_ver(), if it returns a non-empty release string, to get the macOS version rather than the darwin version.

• bpo-35312 [https://bugs.python.org/issue?@action=redirect&bpo=35312]: Make lib2to3.pgen2.parse.ParseError round-trip pickleable. Patch by Anthony Sottile.

• bpo-35308 [https://bugs.python.org/issue?@action=redirect&bpo=35308]: Fix regression in webbrowser where default browsers may be preferred over browsers in the BROWSER environment variable.

• bpo-24746 [https://bugs.python.org/issue?@action=redirect&bpo=24746]: Avoid stripping trailing whitespace in doctest fancy diff. Original patch by R. David Murray & Jairo Trad. Enhanced by Sanyam Khurana.

• bpo-28604 [https://bugs.python.org/issue?@action=redirect&bpo=28604]: locale.localeconv() now sets temporarily the LC_CTYPE locale to the LC_MONETARY locale if the two locales are different and monetary strings are nonASCII. This temporary change affects other threads.

• bpo-35277 [https://bugs.python.org/issue?@action=redirect&bpo=35277]: Update ensurepip to install pip 18.1 and setuptools 40.6.2.

• bpo-24209 [https://bugs.python.org/issue?@action=redirect&bpo=24209]: Adds IPv6 support when invoking http.server directly.

• bpo-35226 [https://bugs.python.org/issue?@action=redirect&bpo=35226]: Recursively check arguments when testing for equality of unittest.mock.call objects and add note that tracking of parameters used to create ancestors of mocks in mock_calls is not possible.

• bpo-29564 [https://bugs.python.org/issue?@action=redirect&bpo=29564]: The warnings module now suggests to enable tracemalloc if the source is specified, the tracemalloc module is available, but tracemalloc is not tracing memory allocations.

• bpo-35189 [https://bugs.python.org/issue?@action=redirect&bpo=35189]: Modify the following fnctl function to retry if interrupted by a signal (EINTR): flock, lockf, fnctl

• bpo-30064 [https://bugs.python.org/issue?@action=redirect&bpo=30064]: Use adddone_callback() in sock* asyncio API to unsubscribe reader/writer early on calcellation.

• bpo-35186 [https://bugs.python.org/issue?@action=redirect&bpo=35186]: Removed the "built with" comment added when setup.py upload is used with either bdist_rpm or bdist_dumb.

• bpo-35152 [https://bugs.python.org/issue?@action=redirect&bpo=35152]: Allow sending more than 2 GB at once on a multiprocessing connection on non-Windows systems.

• bpo-35062 [https://bugs.python.org/issue?@action=redirect&bpo=35062]: Fix incorrect parsing of io.IncrementalNewlineDecoder's translate argument.

• bpo-35065 [https://bugs.python.org/issue?@action=redirect&bpo=35065]: Remove StreamReaderProtocol.untrackreader. The call to untrackreader is currently performed too soon, causing the protocol to forget about the reader before connection_lost can run and feed the EOF to the reader.

• bpo-34160 [https://bugs.python.org/issue?@action=redirect&bpo=34160]: ElementTree and minidom now preserve the attribute order specified by the user.

• bpo-35079 [https://bugs.python.org/issue?@action=redirect&bpo=35079]: Improve difflib.SequenceManager.get_matching_blocks doc by adding 'non-overlapping' and changing '!=' to '<'.

• bpo-33710 [https://bugs.python.org/issue?@action=redirect&bpo=33710]: Deprecated l*gettext() functions and methods in the gettext module. They return encoded bytes instead of Unicode strings and are artifacts from Python 2 times. Also deprecated functions and methods related to setting the charset for l*gettext() functions and methods.

• bpo-35017 [https://bugs.python.org/issue?@action=redirect&bpo=35017]: socketserver.BaseServer.serve_forever() now exits immediately if it's shutdown() method is called while it is polling for new events.

• bpo-35024 [https://bugs.python.org/issue?@action=redirect&bpo=35024]: importlib no longer logs wrote redundantly after (created|could not create) is already logged. Patch by Quentin Agren.

• bpo-35047 [https://bugs.python.org/issue?@action=redirect&bpo=35047]: unittest.mock now includes mock calls in exception messages if assert_not_called, assert_called_once, or assert_called_once_with fails. Patch by Petter Strandmark.

• bpo-31047 [https://bugs.python.org/issue?@action=redirect&bpo=31047]: Fix ntpath.abspath regression where it didn't remove a trailing separator on Windows. Patch by Tim Graham.

• bpo-35053 [https://bugs.python.org/issue?@action=redirect&bpo=35053]: tracemalloc now tries to update the traceback when an object is reused from a "free list" (optimization for faster object creation, used by the builtin list type for example).

• bpo-31553 [https://bugs.python.org/issue?@action=redirect&bpo=31553]: Add the —json-lines option to json.tool. Patch by hongweipeng.

• bpo-34794 [https://bugs.python.org/issue?@action=redirect&bpo=34794]: Fixed a leak in Tkinter when pass the Python wrapper around Tcl_Obj back to Tcl/Tk.

• bpo-34909 [https://bugs.python.org/issue?@action=redirect&bpo=34909]: Enum: fix grandchildren subclassing when parent mixed with concrete data types.

• bpo-35022 [https://bugs.python.org/issue?@action=redirect&bpo=35022]: unittest.mock.MagicMock now supports the __fspath__ method (from os.PathLike).

• bpo-35008 [https://bugs.python.org/issue?@action=redirect&bpo=35008]: Fixed references leaks when call the __setstate__() method of xml.etree.ElementTree.Element in the C implementation for already initialized element.

• bpo-23420 [https://bugs.python.org/issue?@action=redirect&bpo=23420]: Verify the value for the parameter '-s' of the cProfile CLI. Patch by Robert Kuska

• bpo-33947 [https://bugs.python.org/issue?@action=redirect&bpo=33947]: dataclasses now handle recursive reprs without raising RecursionError.

• bpo-34890 [https://bugs.python.org/issue?@action=redirect&bpo=34890]: Make inspect.iscoroutinefunction(), inspect.isgeneratorfunction() and inspect.isasyncgenfunction() work with functools.partial(). Patch by Pablo Galindo.

• bpo-34521 [https://bugs.python.org/issue?@action=redirect&bpo=34521]: Use socket.CMSG_SPACE() to calculate ancillary data size instead of socket.CMSG_LEN() in multiprocessing.reduction.recvfds() as RFC 3542 [https://datatracker.ietf.org/doc/html/rfc3542.html] requires the use of the former for portable applications.

• bpo-31522 [https://bugs.python.org/issue?@action=redirect&bpo=31522]: The mailbox.mbox.get_string function from_ parameter can now successfully be set to a non-default value.

• bpo-34970 [https://bugs.python.org/issue?@action=redirect&bpo=34970]: Protect tasks weak set manipulation in asyncio.all_tasks()

• bpo-34969 [https://bugs.python.org/issue?@action=redirect&bpo=34969]: gzip: Add —fast, —best on the gzip CLI, these parameters will be used for the fast compression method (quick) or the best method compress (slower, but smaller file). Also, change the default compression level to 6 (tradeoff).

• bpo-16965 [https://bugs.python.org/issue?@action=redirect&bpo=16965]: The 2to3 execfile fixer now opens the file with mode 'rb'. Patch by Zackery Spytz.

• bpo-34966 [https://bugs.python.org/issue?@action=redirect&bpo=34966]: pydoc now supports aliases not only to methods defined in the end class, but also to inherited methods. The docstring is not duplicated for aliases.

• bpo-34926 [https://bugs.python.org/issue?@action=redirect&bpo=34926]: mimetypes.MimeTypes.guess_type() now accepts pathlike object in addition to url strings. Patch by Mayank Asthana.

• bpo-23831 [https://bugs.python.org/issue?@action=redirect&bpo=23831]: Add moveto() method to the tkinter.Canvas widget. Patch by Juliette Monsel.

• bpo-34941 [https://bugs.python.org/issue?@action=redirect&bpo=34941]: Methods find(), findtext() and findall() of the Element class in the xml.etree.ElementTree module are now able to find children which are instances of Element subclasses.

• bpo-32680 [https://bugs.python.org/issue?@action=redirect&bpo=32680]: smtplib.SMTP objects now always have a sock attribute present

• bpo-34769 [https://bugs.python.org/issue?@action=redirect&bpo=34769]: Fix for async generators not finalizing when event loop is in debug mode and garbage collector runs in another thread.

• bpo-34936 [https://bugs.python.org/issue?@action=redirect&bpo=34936]: Fix TclError in tkinter.Spinbox.selection_element(). Patch by Juliette Monsel.

• bpo-34829 [https://bugs.python.org/issue?@action=redirect&bpo=34829]: Add methods selection_from, selection_range, selection_present and selection_to to the tkinter.Spinbox for consistency with the tkinter.Entry widget. Patch by Juliette Monsel.

• bpo-34911 [https://bugs.python.org/issue?@action=redirect&bpo=34911]: Added secure_protocols argument to http.cookiejar.DefaultCookiePolicy to allow for tweaking of protocols and also to add support by default for wss, the secure websocket protocol.

• bpo-34922 [https://bugs.python.org/issue?@action=redirect&bpo=34922]: Fixed integer overflow in the digest() and hexdigest() methods for the SHAKE algorithm in the hashlib module.

• bpo-34925 [https://bugs.python.org/issue?@action=redirect&bpo=34925]: 25% speedup in argument parsing for the functions in the bisect module.

• bpo-34900 [https://bugs.python.org/issue?@action=redirect&bpo=34900]: Fixed unittest.TestCase.debug() when used to call test methods with subtests. Patch by Bruno Oliveira.

• bpo-34844 [https://bugs.python.org/issue?@action=redirect&bpo=34844]: logging.Formatter enhancement - Ensure styles and fmt matches in logging.Formatter - Added validate method in each format style class: StrFormatStyle, PercentStyle, StringTemplateStyle. - This method is called in the constructor of logging.Formatter class - Also reraise the KeyError in the format method of each style class, so it would a bit clear that it's an error with the invalid format fields.

• bpo-34897 [https://bugs.python.org/issue?@action=redirect&bpo=34897]: Adjust test.support.missing_compiler_executable check so that a nominal command name of "" is ignored. Patch by Michael Felt.

• bpo-34871 [https://bugs.python.org/issue?@action=redirect&bpo=34871]: Fix inspect module polluted sys.modules when parsing __textsignature_ of callable.

• bpo-34898 [https://bugs.python.org/issue?@action=redirect&bpo=34898]: Add mtime argument to gzip.compress for reproducible output. Patch by Guo Ci Teo.

• bpo-28441 [https://bugs.python.org/issue?@action=redirect&bpo=28441]: On Cygwin and MinGW, ensure that sys.executable always includes the full filename in the path, including the .exe suffix (unless it is a symbolic link).

• bpo-34866 [https://bugs.python.org/issue?@action=redirect&bpo=34866]: Adding max_num_fields to cgi.FieldStorage to make DOS attacks harder by limiting the number of MiniFieldStorage objects created by FieldStorage.

• bpo-34711 [https://bugs.python.org/issue?@action=redirect&bpo=34711]: http.server ensures it reports HTTPStatus.NOT_FOUND when the local path ends with "/" and is not a directory, even if the underlying OS (e.g. AIX) accepts such paths as a valid file reference. Patch by Michael Felt.

• bpo-34872 [https://bugs.python.org/issue?@action=redirect&bpo=34872]: Fix self-cancellation in C implementation of asyncio.Task

• bpo-34849 [https://bugs.python.org/issue?@action=redirect&bpo=34849]: Don't log waiting for selector.select in asyncio loop iteration. The waiting is pretty normal for any asyncio program, logging its time just adds a noise to logs without any useful information provided.

• bpo-34022 [https://bugs.python.org/issue?@action=redirect&bpo=34022]: The SOURCE_DATE_EPOCH environment variable no longer overrides the value of the invalidation_mode argument to py_compile.compile(), and determines its default value instead.

• bpo-34819 [https://bugs.python.org/issue?@action=redirect&bpo=34819]: Use a monotonic clock to compute timeouts in Executor.map() and as_completed(), in order to prevent timeouts from deviating when the system clock is adjusted.

• bpo-34758 [https://bugs.python.org/issue?@action=redirect&bpo=34758]: Add .wasm -> application/wasm to list of recognized file types and content type headers

• bpo-34789 [https://bugs.python.org/issue?@action=redirect&bpo=34789]: xml.sax.make_parser() now accepts any iterable as its parser_list argument. Patch by Andrés Delfino.

• bpo-34334 [https://bugs.python.org/issue?@action=redirect&bpo=34334]: In QueueHandler, clear exc_text from LogRecord to prevent traceback from being written twice.

• bpo-34687 [https://bugs.python.org/issue?@action=redirect&bpo=34687]: On Windows, asyncio now uses ProactorEventLoop, instead of SelectorEventLoop, by default.

• bpo-5950 [https://bugs.python.org/issue?@action=redirect&bpo=5950]: Support reading zip files with archive comments in zipimport.

• bpo-32892 [https://bugs.python.org/issue?@action=redirect&bpo=32892]: The parser now represents all constants as ast.Constant instead of using specific constant AST types (Num, Str, Bytes, NameConstant and Ellipsis). These classes are considered deprecated and will be removed in future Python versions.

• bpo-34728 [https://bugs.python.org/issue?@action=redirect&bpo=34728]: Add deprecation warning when loop is used in methods: asyncio.sleep, asyncio.wait and asyncio.wait_for.

• bpo-34738 [https://bugs.python.org/issue?@action=redirect&bpo=34738]: ZIP files created by distutils will now include entries for directories.

• bpo-34659 [https://bugs.python.org/issue?@action=redirect&bpo=34659]: Add an optional initial argument to itertools.accumulate().

• bpo-29577 [https://bugs.python.org/issue?@action=redirect&bpo=29577]: Support multiple mixin classes when creating Enums.

• bpo-34670 [https://bugs.python.org/issue?@action=redirect&bpo=34670]: Add SSLContext.post_handshake_auth and SSLSocket.verify_client_post_handshake for TLS 1.3's post handshake authentication feature.

• bpo-32718 [https://bugs.python.org/issue?@action=redirect&bpo=32718]: The Activate.ps1 script from venv works with PowerShell Core 6.1 and is now available under all operating systems.

• bpo-31177 [https://bugs.python.org/issue?@action=redirect&bpo=31177]: Fix bug that prevented using reset_mock on mock instances with deleted attributes

• bpo-34672 [https://bugs.python.org/issue?@action=redirect&bpo=34672]: Add a workaround, so the 'Z' time.strftime() specifier on the musl C library can work in some cases.

• bpo-34666 [https://bugs.python.org/issue?@action=redirect&bpo=34666]: Implement asyncio.StreamWriter.awrite and asyncio.StreamWriter.aclose() coroutines. Methods are needed for providing a consistent stream API with control flow switched on by default.

• bpo-6721 [https://bugs.python.org/issue?@action=redirect&bpo=6721]: Acquire the logging module's commonly used internal locks while fork()ing to avoid deadlocks in the child process.

• bpo-34658 [https://bugs.python.org/issue?@action=redirect&bpo=34658]: Fix a rare interpreter unhandled exception state SystemError only seen when using subprocess with a preexec_fn while an after_parent handler has been registered with os.registeratfork and the fork system call fails.

• bpo-34652 [https://bugs.python.org/issue?@action=redirect&bpo=34652]: Ensure os.lchmod() is never defined on Linux.

• bpo-34638 [https://bugs.python.org/issue?@action=redirect&bpo=34638]: Store a weak reference to stream reader to break strong references loop between reader and protocol. It allows to detect and close the socket if the stream is deleted (garbage collected) without close() call.

• bpo-34536 [https://bugs.python.org/issue?@action=redirect&bpo=34536]: Enum.missing: raise ValueError if None returned and TypeError if nonmember is returned.

• bpo-34636 [https://bugs.python.org/issue?@action=redirect&bpo=34636]: Speed up re scanning of many non-matching characters for s w and d within bytes objects. (microoptimization)

• bpo-24412 [https://bugs.python.org/issue?@action=redirect&bpo=24412]: Add addModuleCleanup() and addClassCleanup() to unittest to support cleanups for setUpModule() and setUpClass(). Patch by Lisa Roach.

• bpo-34630 [https://bugs.python.org/issue?@action=redirect&bpo=34630]: Don't log SSL certificate errors in asyncio code (connection error logging is skipped already).

• bpo-32490 [https://bugs.python.org/issue?@action=redirect&bpo=32490]: Prevent filename duplication in subprocess exception messages. Patch by Zackery Spytz.

• bpo-34363 [https://bugs.python.org/issue?@action=redirect&bpo=34363]: dataclasses.asdict() and .astuple() now handle namedtuples correctly.

• bpo-34625 [https://bugs.python.org/issue?@action=redirect&bpo=34625]: Update vendorized expat library version to 2.2.6.

• bpo-32270 [https://bugs.python.org/issue?@action=redirect&bpo=32270]: The subprocess module no longer mistakenly closes redirected fds even when they were in pass_fds when outside of the default {0, 1, 2} set.

• bpo-34622 [https://bugs.python.org/issue?@action=redirect&bpo=34622]: Create a dedicated asyncio.CancelledError, asyncio.InvalidStateError and asyncio.TimeoutError exception classes. Inherit them from corresponding exceptions from concurrent.futures package. Extract asyncio exceptions into a separate file.

• bpo-34610 [https://bugs.python.org/issue?@action=redirect&bpo=34610]: Fixed iterator of multiprocessing.managers.DictProxy.

• bpo-34421 [https://bugs.python.org/issue?@action=redirect&bpo=34421]: Fix distutils logging for nonASCII strings. This caused installation issues on Windows.

• bpo-34604 [https://bugs.python.org/issue?@action=redirect&bpo=34604]: Fix possible mojibake in the error message of pwd.getpwnam and grp.getgrnam using string representation because of invisible characters or trailing whitespaces. Patch by William Grzybowski.

• bpo-30977 [https://bugs.python.org/issue?@action=redirect&bpo=30977]: Make uuid.UUID use __slots__ to reduce its memory footprint. Based on original patch by Wouter Bolsterlee.

• bpo-34574 [https://bugs.python.org/issue?@action=redirect&bpo=34574]: OrderedDict iterators are not exhausted during pickling anymore. Patch by Sergey Fedoseev.

• bpo-8110 [https://bugs.python.org/issue?@action=redirect&bpo=8110]: Refactored subprocess to check for Windows-specific modules rather than sys.platform == 'win32'.

• bpo-34530 [https://bugs.python.org/issue?@action=redirect&bpo=34530]: distutils.spawn.find_executable() now falls back on os.defpath if the PATH environment variable is not set.

• bpo-34563 [https://bugs.python.org/issue?@action=redirect&bpo=34563]: On Windows, fix multiprocessing.Connection for very large read: fix winapi.PeekNamedPipe() and winapi.ReadFile() for read larger than INT_MAX (usually 2**31-1).

• bpo-34558 [https://bugs.python.org/issue?@action=redirect&bpo=34558]: Correct typo in Lib/ctypes/_aix.py

• bpo-34282 [https://bugs.python.org/issue?@action=redirect&bpo=34282]: Move Enum._convert to EnumMeta._convert_ and fix enum members getting shadowed by parent attributes.

• bpo-22872 [https://bugs.python.org/issue?@action=redirect&bpo=22872]: When the queue is closed, ValueError is now raised by multiprocessing.Queue.put() and multiprocessing.Queue.get() instead of AssertionError and OSError, respectively. Patch by Zackery Spytz.

• bpo-34515 [https://bugs.python.org/issue?@action=redirect&bpo=34515]: Fix parsing nonASCII identifiers in lib2to3.pgen2.tokenize ( PEP 3131 [https://peps.python.org/pep-3131/]).

• bpo-13312 [https://bugs.python.org/issue?@action=redirect&bpo=13312]: Avoids a possible integer underflow (undefined behavior) in the time module's year handling code when passed a very low negative year value.

• bpo-34472 [https://bugs.python.org/issue?@action=redirect&bpo=34472]: Improved compatibility for streamed files in zipfile. Previously an optional signature was not being written and certain ZIP applications were not supported. Patch by Silas Sewell.

• bpo-34454 [https://bugs.python.org/issue?@action=redirect&bpo=34454]: Fix the .fromisoformat() methods of datetime types crashing when given unicode with non-UTF-8-encodable code points. Specifically, datetime.fromisoformat() now accepts surrogate unicode code points used as the separator. Report and tests by Alexey Izbyshev, patch by Paul Ganssle.

• bpo-6700 [https://bugs.python.org/issue?@action=redirect&bpo=6700]: Fix inspect.getsourcelines for module level frames/tracebacks. Patch by Vladimir Matveev.

• bpo-34171 [https://bugs.python.org/issue?@action=redirect&bpo=34171]: Running the trace module no longer creates the trace.cover file.

• bpo-34441 [https://bugs.python.org/issue?@action=redirect&bpo=34441]: Fix crash when an ABC-derived class with invalid __subclasses__ is passed as the second argument to issubclass(). Patch by Alexey Izbyshev.

• bpo-34427 [https://bugs.python.org/issue?@action=redirect&bpo=34427]: Fix infinite loop in a.extend(a) for MutableSequence subclasses.

• bpo-34412 [https://bugs.python.org/issue?@action=redirect&bpo=34412]: Make signal.strsignal() work on HP-UX. Patch by Michael Osipov.

• bpo-20849 [https://bugs.python.org/issue?@action=redirect&bpo=20849]: shutil.copytree now accepts a new dirs_exist_ok keyword argument. Patch by Josh Bronson.

• bpo-31715 [https://bugs.python.org/issue?@action=redirect&bpo=31715]: Associate .mjs file extension with application/javascript MIME Type.

• bpo-34384 [https://bugs.python.org/issue?@action=redirect&bpo=34384]: os.readlink() now accepts pathlike and bytes objects on Windows.

• bpo-22602 [https://bugs.python.org/issue?@action=redirect&bpo=22602]: The UTF-7 decoder now raises UnicodeDecodeError for ill-formed sequences starting with "+" (as specified in RFC 2152). Patch by Zackery Spytz.

• bpo-2122 [https://bugs.python.org/issue?@action=redirect&bpo=2122]: The mmap.flush() method now returns None on success, raises an exception on error under all platforms.

• bpo-34341 [https://bugs.python.org/issue?@action=redirect&bpo=34341]: Appending to the ZIP archive with the ZIP64 extension no longer grows the size of extra fields of existing entries.

• bpo-34333 [https://bugs.python.org/issue?@action=redirect&bpo=34333]: Fix %-formatting in pathlib.PurePath.with_suffix() when formatting an error message.

• bpo-18540 [https://bugs.python.org/issue?@action=redirect&bpo=18540]: The imaplib.IMAP4 and imaplib.IMAP4_SSL classes now resolve to the local host IP correctly when the default value of host parameter ('') is used.

• bpo-26502 [https://bugs.python.org/issue?@action=redirect&bpo=26502]: Implement traceback.FrameSummary.__len__() method to preserve compatibility with the old tuple API.

• bpo-34318 [https://bugs.python.org/issue?@action=redirect&bpo=34318]: assertRaises(), assertRaisesRegex(), assertWarns() and assertWarnsRegex() no longer success if the passed callable is None. They no longer ignore unknown keyword arguments in the context manager mode. A DeprecationWarning was raised in these cases since Python 3.5.

• bpo-9372 [https://bugs.python.org/issue?@action=redirect&bpo=9372]: Deprecate __getitem__() methods of xml.dom.pulldom.DOMEventStream, wsgiref.util.FileWrapper and fileinput.FileInput.

• bpo-33613 [https://bugs.python.org/issue?@action=redirect&bpo=33613]: Fix a race condition in multiprocessing.semaphore_tracker when the tracker receives SIGINT before it can register signal handlers for ignoring it.

• bpo-34248 [https://bugs.python.org/issue?@action=redirect&bpo=34248]: Report filename in the exception raised when the database file cannot be opened by dbm.gnu.open() and dbm.ndbm.open() due to OS-related error. Patch by Zsolt Cserna.

• bpo-33089 [https://bugs.python.org/issue?@action=redirect&bpo=33089]: Add math.dist() to compute the Euclidean distance between two points.

• bpo-34246 [https://bugs.python.org/issue?@action=redirect&bpo=34246]: smtplib.SMTP.send_message() no longer modifies the content of the mail_options argument. Patch by Pablo S. Blum de Aguiar.

• bpo-31047 [https://bugs.python.org/issue?@action=redirect&bpo=31047]: Fix ntpath.abspath for invalid paths on windows. Patch by Franz Woellert.

• bpo-32321 [https://bugs.python.org/issue?@action=redirect&bpo=32321]: Add pure Python fallback for functools.reduce. Patch by Robert Wright.

• bpo-34270 [https://bugs.python.org/issue?@action=redirect&bpo=34270]: The default asyncio task class now always has a name which can be get or set using two new methods (get_name() and set_name()) and is visible in the repr() output. An initial name can also be set using the new name keyword argument to asyncio.create_task() or the create_task() method of the event loop. If no initial name is set, the default Task implementation generates a name like Task-1 using a monotonic counter.

• bpo-34263 [https://bugs.python.org/issue?@action=redirect&bpo=34263]: asyncio's event loop will not pass timeouts longer than one day to epoll/select etc.

• bpo-34035 [https://bugs.python.org/issue?@action=redirect&bpo=34035]: Fix several AttributeError in zipfile seek() methods. Patch by Mickaël Schoentgen.

• bpo-32215 [https://bugs.python.org/issue?@action=redirect&bpo=32215]: Fix performance regression in sqlite3 when a DML statement appeared in a different line than the rest of the SQL query.

• bpo-34075 [https://bugs.python.org/issue?@action=redirect&bpo=34075]: Deprecate passing non-ThreadPoolExecutor instances to AbstractEventLoop.set_default_executor().

• bpo-34251 [https://bugs.python.org/issue?@action=redirect&bpo=34251]: Restore msilib.Win64 to preserve backwards compatibility since it's already used by distutils' bdist_msi command.

• bpo-19891 [https://bugs.python.org/issue?@action=redirect&bpo=19891]: Ignore errors caused by missing / non-writable homedir while writing history during exit of an interactive session. Patch by Anthony Sottile.

• bpo-33089 [https://bugs.python.org/issue?@action=redirect&bpo=33089]: Enhanced math.hypot() to support more than two dimensions.

• bpo-34228 [https://bugs.python.org/issue?@action=redirect&bpo=34228]: tracemalloc: PYTHONTRACEMALLOC=0 environment variable and -X tracemalloc=0 command line option are now allowed to disable explicitly tracemalloc at startup.

• bpo-13041 [https://bugs.python.org/issue?@action=redirect&bpo=13041]: Use shutil.get_terminal_size() to calculate the terminal width correctly in the argparse.HelpFormatter class. Initial patch by Zbyszek Jędrzejewski-Szmek.

• bpo-34213 [https://bugs.python.org/issue?@action=redirect&bpo=34213]: Allow frozen dataclasses to have a field named "object". Previously this conflicted with an internal use of "object".

• bpo-34052 [https://bugs.python.org/issue?@action=redirect&bpo=34052]: sqlite3.Connection.create_aggregate(), sqlite3.Connection.create_function(), sqlite3.Connection.set_authorizer(), sqlite3.Connection.set_progress_handler() methods raises TypeError when unhashable objects are passed as callable. These methods now don't pass such objects to SQLite API. Previous behavior could lead to segfaults. Patch by Sergey Fedoseev.

• bpo-34197 [https://bugs.python.org/issue?@action=redirect&bpo=34197]: Attributes skipinitialspace, doublequote and strict of the dialect attribute of the csv reader are now bool instances instead of integers 0 or 1.

• bpo-32788 [https://bugs.python.org/issue?@action=redirect&bpo=32788]: Errors other than TypeError raised in methods __adapt__() and __conform__() in the sqlite3 module are now propagated to the user.

• bpo-21446 [https://bugs.python.org/issue?@action=redirect&bpo=21446]: The reload fixer now uses importlib.reload() instead of deprecated imp.reload().

• bpo-940286 [https://bugs.python.org/issue?@action=redirect&bpo=940286]: pydoc's Helper.showtopic() method now prints the cross references of a topic correctly.

• bpo-34164 [https://bugs.python.org/issue?@action=redirect&bpo=34164]: base64.b32decode() could raise UnboundLocalError or OverflowError for incorrect padding. Now it always raises base64.Error in these cases.

• bpo-33729 [https://bugs.python.org/issue?@action=redirect&bpo=33729]: Fixed issues with arguments parsing in hashlib.

• bpo-34097 [https://bugs.python.org/issue?@action=redirect&bpo=34097]: ZipFile can zip files older than 1980-01-01 and newer than 2107-12-31 using a new strict_timestamps parameter at the cost of setting the timestamp to the limit.

• bpo-34108 [https://bugs.python.org/issue?@action=redirect&bpo=34108]: Remove extraneous CR in 2to3 refactor.

• bpo-34070 [https://bugs.python.org/issue?@action=redirect&bpo=34070]: Make sure to only check if the handle is a tty, when opening a file with buffering=-1.

• bpo-27494 [https://bugs.python.org/issue?@action=redirect&bpo=27494]: Reverted bpo-27494 [https://bugs.python.org/issue?@action=redirect&bpo=27494]. 2to3 rejects now a trailing comma in generator expressions.

• bpo-33967 [https://bugs.python.org/issue?@action=redirect&bpo=33967]: functools.singledispatch now raises TypeError instead of IndexError when no positional arguments are passed.

• bpo-34041 [https://bugs.python.org/issue?@action=redirect&bpo=34041]: Add the parameter deterministic to the sqlite3.Connection.create_function() method. Patch by Sergey Fedoseev.

• bpo-34056 [https://bugs.python.org/issue?@action=redirect&bpo=34056]: Ensure the loader shim created by imp.load_module always returns bytes from its get_data() function. This fixes using imp.load_module with PEP 552 [https://peps.python.org/pep-0552/] hash-based pycs.

• bpo-34054 [https://bugs.python.org/issue?@action=redirect&bpo=34054]: The multiprocessing module now uses the monotonic clock time.monotonic() instead of the system clock time.time() to implement timeout.

• bpo-34043 [https://bugs.python.org/issue?@action=redirect&bpo=34043]: Optimize tarfile uncompress performance about 15% when gzip is used.

• bpo-34044 [https://bugs.python.org/issue?@action=redirect&bpo=34044]: subprocess.Popen now copies the startupinfo argument to leave it unchanged: it will modify the copy, so that the same STARTUPINFO object can be used multiple times.

• bpo-34010 [https://bugs.python.org/issue?@action=redirect&bpo=34010]: Fixed a performance regression for reading streams with tarfile. The buffered read should use a list, instead of appending to a bytes object.

• bpo-34019 [https://bugs.python.org/issue?@action=redirect&bpo=34019]: webbrowser: Correct the arguments passed to Opera Browser when opening a new URL using the webbrowser module. Patch by Bumsik Kim.

• bpo-34003 [https://bugs.python.org/issue?@action=redirect&bpo=34003]: csv.DictReader now creates dicts instead of OrderedDicts. Patch by Michael Selik.

• bpo-33978 [https://bugs.python.org/issue?@action=redirect&bpo=33978]: Closed existing logging handlers before reconfiguration via fileConfig and dictConfig. Patch by Karthikeyan Singaravelan.

• bpo-14117 [https://bugs.python.org/issue?@action=redirect&bpo=14117]: Make minor tweaks to turtledemo. The 'wikipedia' example is now 'rosette', describing what it draws. The 'penrose' print output is reduced. The'1024' output of 'tree' is eliminated.

• bpo-33974 [https://bugs.python.org/issue?@action=redirect&bpo=33974]: Fixed passing lists and tuples of strings containing special characters ", \, {, } and \n as options to ttk widgets.

• bpo-27500 [https://bugs.python.org/issue?@action=redirect&bpo=27500]: Fix getaddrinfo to resolve IPv6 addresses correctly.

• bpo-24567 [https://bugs.python.org/issue?@action=redirect&bpo=24567]: Improve random.choices() to handle subnormal input weights that could occasionally trigger an IndexError.

• bpo-33871 [https://bugs.python.org/issue?@action=redirect&bpo=33871]: Fixed integer overflow in os.readv(), os.writev(), os.preadv() and os.pwritev() and in os.sendfile() with headers or trailers arguments (on BSD-based OSes and macOS).

• bpo-25007 [https://bugs.python.org/issue?@action=redirect&bpo=25007]: Add copy.copy() and copy.deepcopy() support to zlib compressors and decompressors. Patch by Zackery Spytz.

• bpo-33929 [https://bugs.python.org/issue?@action=redirect&bpo=33929]: multiprocessing: Fix a race condition in Popen of multiprocessing.popen_spawn_win32. The child process now duplicates the read end of pipe instead of "stealing" it. Previously, the read end of pipe was "stolen" by the child process, but it leaked a handle if the child process had been terminated before it could steal the handle from the parent process.

• bpo-33899 [https://bugs.python.org/issue?@action=redirect&bpo=33899]: Tokenize module now implicitly emits a NEWLINE when provided with input that does not have a trailing new line. This behavior now matches what the C tokenizer does internally. Contributed by Ammar Askar.

• bpo-33897 [https://bugs.python.org/issue?@action=redirect&bpo=33897]: Added a 'force' keyword argument to logging.basicConfig().

• bpo-33695 [https://bugs.python.org/issue?@action=redirect&bpo=33695]: shutil.copytree() uses os.scandir() function and all copy functions depending from it use cached os.stat() values. The speedup for copying a directory with 8000 files is around +9% on Linux, +20% on Windows and + 30% on a Windows SMB share. Also the number of os.stat() syscalls is reduced by 38% making shutil.copytree() especially faster on network filesystems. (Contributed by Giampaolo Rodola' in bpo-33695 [https://bugs.python.org/issue?@action=redirect&bpo=33695].)

• bpo-33916 [https://bugs.python.org/issue?@action=redirect&bpo=33916]: bz2 and lzma: When Decompressor.init() is called twice, free the old lock to not leak memory.

• bpo-32568 [https://bugs.python.org/issue?@action=redirect&bpo=32568]: Make select.epoll() and its documentation consistent regarding sizehint and flags.

• bpo-33833 [https://bugs.python.org/issue?@action=redirect&bpo=33833]: Fixed bug in asyncio where ProactorSocketTransport logs AssertionError if force closed during write.

• bpo-33663 [https://bugs.python.org/issue?@action=redirect&bpo=33663]: Convert content length to string before putting to header.

• bpo-33721 [https://bugs.python.org/issue?@action=redirect&bpo=33721]: os.path functions that return a boolean result like exists(), lexists(), isdir(), isfile(), islink(), and ismount(), and pathlib.Path methods that return a boolean result like exists(), is_dir(), is_file(), is_mount(), is_symlink(), is_block_device(), is_char_device(), is_fifo(), is_socket() now return False instead of raising ValueError or its subclasses UnicodeEncodeError and UnicodeDecodeError for paths that contain characters or bytes unrepresentable at the OS level.

• bpo-26544 [https://bugs.python.org/issue?@action=redirect&bpo=26544]: Fixed implementation of platform.libc_ver(). It almost always returned version '2.9' for glibc.

• bpo-33843 [https://bugs.python.org/issue?@action=redirect&bpo=33843]: Remove deprecated cgi.escape, cgi.parse_qs and cgi.parse_qsl.

• bpo-33842 [https://bugs.python.org/issue?@action=redirect&bpo=33842]: Remove tarfile.filemode which is deprecated since Python 3.3.

• bpo-30167 [https://bugs.python.org/issue?@action=redirect&bpo=30167]: Prevent site.main() exception if PYTHONSTARTUP is set. Patch by Steve Weber.

• bpo-33805 [https://bugs.python.org/issue?@action=redirect&bpo=33805]: Improve error message of dataclasses.replace() when an InitVar is not specified

• bpo-33687 [https://bugs.python.org/issue?@action=redirect&bpo=33687]: Fix the call to os.chmod() for uu.decode() if a mode is given or decoded. Patch by Timo Furrer.

• bpo-33812 [https://bugs.python.org/issue?@action=redirect&bpo=33812]: Datetime instance d with non-None tzinfo, but with d.tzinfo.utcoffset(d) returning None is now treated as naive by the astimezone() method.

• bpo-32108 [https://bugs.python.org/issue?@action=redirect&bpo=32108]: In configparser, don't clear section when it is assigned to itself.

• bpo-27397 [https://bugs.python.org/issue?@action=redirect&bpo=27397]: Make email module properly handle invalid-length base64 strings.

• bpo-33578 [https://bugs.python.org/issue?@action=redirect&bpo=33578]: Implement multibyte encoder/decoder state methods

• bpo-30805 [https://bugs.python.org/issue?@action=redirect&bpo=30805]: Avoid race condition with debug logging

• bpo-33476 [https://bugs.python.org/issue?@action=redirect&bpo=33476]: Fix headervalue_parser.py when address group is missing final ';'. Contributed by Enrique Perez-Terron

• bpo-33694 [https://bugs.python.org/issue?@action=redirect&bpo=33694]: asyncio: Fix a race condition causing data loss on pause_reading()/resume_reading() when using the ProactorEventLoop.

• bpo-32493 [https://bugs.python.org/issue?@action=redirect&bpo=32493]: Correct test for uuid_enc_be availability in configure.ac. Patch by Michael Felt.

• bpo-33792 [https://bugs.python.org/issue?@action=redirect&bpo=33792]: Add asyncio.WindowsSelectorEventLoopPolicy and asyncio.WindowsProactorEventLoopPolicy.

• bpo-33274 [https://bugs.python.org/issue?@action=redirect&bpo=33274]: W3C DOM Level 1 specifies return value of Element.removeAttributeNode() as "The Attr node that was removed." xml.dom.minidom now complies with this requirement.

• bpo-33778 [https://bugs.python.org/issue?@action=redirect&bpo=33778]: Update unicodedata's database to Unicode version 11.0.0.

• bpo-33165 [https://bugs.python.org/issue?@action=redirect&bpo=33165]: Added a stacklevel parameter to logging calls to allow use of wrapper/helper functions for logging APIs.

• bpo-33770 [https://bugs.python.org/issue?@action=redirect&bpo=33770]: improve base64 exception message for encoded inputs of invalid length

• bpo-33769 [https://bugs.python.org/issue?@action=redirect&bpo=33769]: asyncio/start_tls: Fix error message; cancel callbacks in case of an unhandled error; mark SSLTransport as closed if it is aborted.

• bpo-33767 [https://bugs.python.org/issue?@action=redirect&bpo=33767]: The concatenation (+) and repetition (*) sequence operations now raise TypeError instead of SystemError when performed on mmap.mmap objects. Patch by Zackery Spytz.

• bpo-33734 [https://bugs.python.org/issue?@action=redirect&bpo=33734]: asyncio/ssl: Fix AttributeError, increase default handshake timeout

• bpo-31014 [https://bugs.python.org/issue?@action=redirect&bpo=31014]: Fixed creating a controller for webbrowser when a user specifies a path to an entry in the BROWSER environment variable. Based on patch by John Still.

• bpo-2504 [https://bugs.python.org/issue?@action=redirect&bpo=2504]: Add gettext.pgettext() and variants.

• bpo-33197 [https://bugs.python.org/issue?@action=redirect&bpo=33197]: Add description property for _ParameterKind

• bpo-32751 [https://bugs.python.org/issue?@action=redirect&bpo=32751]: When cancelling the task due to a timeout, asyncio.wait_for() will now wait until the cancellation is complete.

• bpo-32684 [https://bugs.python.org/issue?@action=redirect&bpo=32684]: Fix gather to propagate cancellation of itself even with return_exceptions.

• bpo-33654 [https://bugs.python.org/issue?@action=redirect&bpo=33654]: Support protocol type switching in SSLTransport.set_protocol().

• bpo-33674 [https://bugs.python.org/issue?@action=redirect&bpo=33674]: Pause the transport as early as possible to further reduce the risk of data_received() being called before connection_made().

• bpo-33671 [https://bugs.python.org/issue?@action=redirect&bpo=33671]: shutil.copyfile(), shutil.copy(), shutil.copy2(), shutil.copytree() and shutil.move() use platform-specific fast-copy syscalls on Linux and macOS in order to copy the file more efficiently. On Windows shutil.copyfile() uses a bigger default buffer size (1 MiB instead of 16 KiB) and a memoryview()-based variant of shutil.copyfileobj() is used. The speedup for copying a 512MiB file is about +26% on Linux, +50% on macOS and +40% on Windows. Also, much less CPU cycles are consumed. (Contributed by Giampaolo Rodola' in bpo-25427 [https://bugs.python.org/issue?@action=redirect&bpo=25427].)

• bpo-33674 [https://bugs.python.org/issue?@action=redirect&bpo=33674]: Fix a race condition in SSLProtocol.connection_made() of asyncio.sslproto: start immediately the handshake instead of using call_soon(). Previously, data_received() could be called before the handshake started, causing the handshake to hang or fail.

• bpo-31647 [https://bugs.python.org/issue?@action=redirect&bpo=31647]: Fixed bug where calling write_eof() on a _SelectorSocketTransport after it's already closed raises AttributeError.

• bpo-32610 [https://bugs.python.org/issue?@action=redirect&bpo=32610]: Make asyncio.all_tasks() return only pending tasks.

• bpo-32410 [https://bugs.python.org/issue?@action=redirect&bpo=32410]: Avoid blocking on file IO in sendfile fallback code

• bpo-33469 [https://bugs.python.org/issue?@action=redirect&bpo=33469]: Fix RuntimeError after closing loop that used run_in_executor

• bpo-33672 [https://bugs.python.org/issue?@action=redirect&bpo=33672]: Fix Task.repr crash with Cython's bogus coroutines

• bpo-33654 [https://bugs.python.org/issue?@action=redirect&bpo=33654]: Fix transport.set_protocol() to support switching between asyncio.Protocol and asyncio.BufferedProtocol. Fix loop.start_tls() to work with asyncio.BufferedProtocols.

• bpo-33652 [https://bugs.python.org/issue?@action=redirect&bpo=33652]: Pickles of type variables and subscripted generics are now future-proof and compatible with older Python versions.

• bpo-32493 [https://bugs.python.org/issue?@action=redirect&bpo=32493]: Fixed uuid.uuid1() on FreeBSD.

• bpo-33238 [https://bugs.python.org/issue?@action=redirect&bpo=33238]: Add InvalidStateError to concurrent.futures. Future.set_result and Future.set_exception now raise InvalidStateError if the futures are not pending or running. Patch by Jason Haydaman.

• bpo-33618 [https://bugs.python.org/issue?@action=redirect&bpo=33618]: Finalize and document preliminary and experimental TLS 1.3 support with OpenSSL 1.1.1

• bpo-33625 [https://bugs.python.org/issue?@action=redirect&bpo=33625]: Release GIL on grp.getgrnam, grp.getgrgid, pwd.getpwnam and pwd.getpwuid if reentrant variants of these functions are available. Patch by William Grzybowski.

• bpo-33623 [https://bugs.python.org/issue?@action=redirect&bpo=33623]: Fix possible SIGSGV when asyncio.Future is created in del

• bpo-11874 [https://bugs.python.org/issue?@action=redirect&bpo=11874]: Use a better regex when breaking usage into wrappable parts. Avoids bogus assertion errors from custom metavar strings.

• bpo-30877 [https://bugs.python.org/issue?@action=redirect&bpo=30877]: Fixed a bug in the Python implementation of the JSON decoder that prevented the cache of parsed strings from clearing after finishing the decoding. Based on patch by c-fos.

• bpo-33604 [https://bugs.python.org/issue?@action=redirect&bpo=33604]: Remove HMAC default to md5 marked for removal in 3.8 (removal originally planned in 3.6, bump to 3.8 in PR 7062).

• bpo-33582 [https://bugs.python.org/issue?@action=redirect&bpo=33582]: Emit a deprecation warning for inspect.formatargspec

• bpo-21145 [https://bugs.python.org/issue?@action=redirect&bpo=21145]: Add functools.cached_property decorator, for computed properties cached for the life of the instance.

• bpo-33570 [https://bugs.python.org/issue?@action=redirect&bpo=33570]: Change TLS 1.3 cipher suite settings for compatibility with OpenSSL 1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 ciphers enabled by default.

• bpo-28556 [https://bugs.python.org/issue?@action=redirect&bpo=28556]: Do not simplify arguments to typing.Union. Now Union[Manager, Employee] is not simplified to Employee at runtime. Such simplification previously caused several bugs and limited possibilities for introspection.

• bpo-12486 [https://bugs.python.org/issue?@action=redirect&bpo=12486]: tokenize.generate_tokens() is now documented as a public API to tokenize unicode strings. It was previously present but undocumented.

• bpo-33540 [https://bugs.python.org/issue?@action=redirect&bpo=33540]: Add a new block_on_close class attribute to ForkingMixIn and ThreadingMixIn classes of socketserver.

• bpo-33548 [https://bugs.python.org/issue?@action=redirect&bpo=33548]: tempfile._candidate_tempdir_list should consider common TEMP locations

• bpo-33109 [https://bugs.python.org/issue?@action=redirect&bpo=33109]: argparse subparsers are once again not required by default, reverting the change in behavior introduced by bpo-26510 [https://bugs.python.org/issue?@action=redirect&bpo=26510] in 3.7.0a2.

• bpo-33541 [https://bugs.python.org/issue?@action=redirect&bpo=33541]: Remove unused private method strptime.LocaleTime._pad (a.k.a. LocaleTime_pad).

• bpo-33536 [https://bugs.python.org/issue?@action=redirect&bpo=33536]: dataclasses.make_dataclass now checks for invalid field names and duplicate fields. Also, added a check for invalid field specifications.

• bpo-33542 [https://bugs.python.org/issue?@action=redirect&bpo=33542]: Prevent uuid.get_node from using a DUID instead of a MAC on Windows. Patch by Zvi Effron

• bpo-26819 [https://bugs.python.org/issue?@action=redirect&bpo=26819]: Fix race condition with ReadTransport.resume_reading in Windows proactor event loop.

• Fix failure in typing.get_type_hints() when ClassVar was provided as a string forward reference.

• bpo-33516 [https://bugs.python.org/issue?@action=redirect&bpo=33516]: unittest.mock.MagicMock now supports the __round__ magic method.

• bpo-28612 [https://bugs.python.org/issue?@action=redirect&bpo=28612]: Added support for Site Maps to urllib's RobotFileParser as RobotFileParser.site_maps(). Patch by Lady Red, based on patch by Peter Wirtz.

• bpo-28167 [https://bugs.python.org/issue?@action=redirect&bpo=28167]: Remove platform.linux_distribution, which was deprecated since 3.5.

• bpo-33504 [https://bugs.python.org/issue?@action=redirect&bpo=33504]: Switch the default dictionary implementation for configparser from collections.OrderedDict to the standard dict type.

• bpo-33505 [https://bugs.python.org/issue?@action=redirect&bpo=33505]: Optimize asyncio.ensure_future() by reordering if checks: 1.17x faster.

• bpo-33497 [https://bugs.python.org/issue?@action=redirect&bpo=33497]: Add errors param to cgi.parse_multipart and make an encoding in FieldStorage use the given errors (needed for Twisted). Patch by Amber Brown.

• bpo-29235 [https://bugs.python.org/issue?@action=redirect&bpo=29235]: The cProfile.Profile class can now be used as a context manager. Patch by Scott Sanderson.

• bpo-33495 [https://bugs.python.org/issue?@action=redirect&bpo=33495]: Change dataclasses.Fields repr to use the repr of each of its members, instead of str. This makes it more clear what each field actually represents. This is especially true for the 'type' member.

• bpo-26103 [https://bugs.python.org/issue?@action=redirect&bpo=26103]: Correct inspect.isdatadescriptor to look for _set_ or __delete__. Patch by Aaron Hall.

• bpo-29209 [https://bugs.python.org/issue?@action=redirect&bpo=29209]: Removed the doctype() method and the html parameter of the constructor of XMLParser. The doctype() method defined in a subclass will no longer be called. Deprecated methods getchildren() and getiterator() in the ElementTree module emit now a DeprecationWarning instead of PendingDeprecationWarning.

• bpo-33453 [https://bugs.python.org/issue?@action=redirect&bpo=33453]: Fix dataclasses to work if using literal string type annotations or if using PEP 563 "Postponed Evaluation of Annotations". Only specific string prefixes are detected for both ClassVar ("ClassVar" and "typing.ClassVar") and InitVar ("InitVar" and "dataclasses.InitVar").

• bpo-28556 [https://bugs.python.org/issue?@action=redirect&bpo=28556]: Minor fixes in typing module: add annotations to NamedTuple._new_, pass *args and **kwds in Generic._new_. Original PRs by Paulius Šarka and Chad Dombrova.

• bpo-33365 [https://bugs.python.org/issue?@action=redirect&bpo=33365]: Print the header values besides the header keys instead just the header keys if debuglevel is set to >0 in http.client. Patch by Marco Strigl.

• bpo-20087 [https://bugs.python.org/issue?@action=redirect&bpo=20087]: Updated alias mapping with glibc 2.27 supported locales.

• bpo-33422 [https://bugs.python.org/issue?@action=redirect&bpo=33422]: Fix trailing quotation marks getting deleted when looking up byte/string literals on pydoc. Patch by Andrés Delfino.

• bpo-28167 [https://bugs.python.org/issue?@action=redirect&bpo=28167]: The function platform.linux_distribution and platform.dist now trigger a DeprecationWarning and have been marked for removal in Python 3.8

• bpo-33281 [https://bugs.python.org/issue?@action=redirect&bpo=33281]: Fix ctypes.util.find_library regression on macOS.

• bpo-33311 [https://bugs.python.org/issue?@action=redirect&bpo=33311]: Text and html output generated by cgitb does not display parentheses if the current call is done directly in the module. Patch by Stéphane Blondon.

• bpo-27300 [https://bugs.python.org/issue?@action=redirect&bpo=27300]: The file classes in tempfile now accept an errors parameter that complements the already existing encoding. Patch by Stephan Hohe.

• bpo-32933 [https://bugs.python.org/issue?@action=redirect&bpo=32933]: unittest.mock.mock_open() now supports iteration over the file contents. Patch by Tony Flury.

• bpo-33217 [https://bugs.python.org/issue?@action=redirect&bpo=33217]: Raise TypeError when looking up non-Enum objects in Enum classes and Enum members.

• bpo-33197 [https://bugs.python.org/issue?@action=redirect&bpo=33197]: Update error message when constructing invalid inspect.Parameters Patch by Donghee Na.

• bpo-33383 [https://bugs.python.org/issue?@action=redirect&bpo=33383]: Fixed crash in the get() method of the dbm.ndbm database object when it is called with a single argument.

• bpo-33375 [https://bugs.python.org/issue?@action=redirect&bpo=33375]: The warnings module now finds the Python file associated with a warning from the code object, rather than the frame's global namespace. This is consistent with how tracebacks and pdb find filenames, and should work better for dynamically executed code.

• bpo-33336 [https://bugs.python.org/issue?@action=redirect&bpo=33336]: imaplib now allows MOVE command in IMAP4.uid() (RFC 6851: IMAP MOVE Extension) and potentially as a name of supported method of IMAP4 object.

• bpo-32455 [https://bugs.python.org/issue?@action=redirect&bpo=32455]: Added jump parameter to dis.stack_effect().

• bpo-27485 [https://bugs.python.org/issue?@action=redirect&bpo=27485]: Rename and deprecate undocumented functions in urllib.parse().

• bpo-33332 [https://bugs.python.org/issue?@action=redirect&bpo=33332]: Add signal.valid_signals() to expose the POSIX sigfillset() functionality.

• bpo-33251 [https://bugs.python.org/issue?@action=redirect&bpo=33251]: ConfigParser.items() was fixed so that key-value pairs passed in via vars() are not included in the resulting output.

• bpo-33329 [https://bugs.python.org/issue?@action=redirect&bpo=33329]: Fix multiprocessing regression on newer glibcs

• bpo-33334 [https://bugs.python.org/issue?@action=redirect&bpo=33334]: dis.stack_effect() now supports all defined opcodes including NOP and EXTENDED_ARG.

• bpo-991266 [https://bugs.python.org/issue?@action=redirect&bpo=991266]: Fix quoting of the Comment attribute of http.cookies.SimpleCookie.

• bpo-33131 [https://bugs.python.org/issue?@action=redirect&bpo=33131]: Upgrade bundled version of pip to 10.0.1.

• bpo-33308 [https://bugs.python.org/issue?@action=redirect&bpo=33308]: Fixed a crash in the parser module when converting an ST object to a tree of tuples or lists with line_info=False and col_info=True.

• bpo-23403 [https://bugs.python.org/issue?@action=redirect&bpo=23403]: lib2to3 now uses pickle protocol 4 for precomputed grammars.

• bpo-33266 [https://bugs.python.org/issue?@action=redirect&bpo=33266]: lib2to3 now recognizes rf'…' strings.

• bpo-11594 [https://bugs.python.org/issue?@action=redirect&bpo=11594]: Ensure line-endings are respected when using lib2to3.

• bpo-33254 [https://bugs.python.org/issue?@action=redirect&bpo=33254]: Have importlib.resources.contents() and importlib.abc.ResourceReader.contents() return an iterable instead of an iterator.

• bpo-33265 [https://bugs.python.org/issue?@action=redirect&bpo=33265]: contextlib.ExitStack and contextlib.AsyncExitStack now use a method instead of a wrapper function for exit callbacks.

• bpo-33263 [https://bugs.python.org/issue?@action=redirect&bpo=33263]: Fix FD leak in _SelectorSocketTransport Patch by Vlad Starostin.

• bpo-33256 [https://bugs.python.org/issue?@action=redirect&bpo=33256]: Fix display of call in the html produced by cgitb.html(). Patch by Stéphane Blondon.

• bpo-33144 [https://bugs.python.org/issue?@action=redirect&bpo=33144]: random.Random() and its subclassing mechanism got optimized to check only once at class/subclass instantiation time whether its getrandbits() method can be relied on by other methods, including randrange(), for the generation of arbitrarily large random integers. Patch by Wolfgang Maier.

• bpo-33185 [https://bugs.python.org/issue?@action=redirect&bpo=33185]: Fixed regression when running pydoc with the -m switch. (The regression was introduced in 3.7.0b3 by the resolution of bpo-33053 [https://bugs.python.org/issue?@action=redirect&bpo=33053]) This fix also changed pydoc to add os.getcwd() to sys.path when necessary, rather than adding ".".

• bpo-29613 [https://bugs.python.org/issue?@action=redirect&bpo=29613]: Added support for the SameSite cookie flag to the http.cookies module.

• bpo-33169 [https://bugs.python.org/issue?@action=redirect&bpo=33169]: Delete entries of None in sys.path_importer_cache when importlib.machinery.invalidate_caches() is called.

• bpo-33203 [https://bugs.python.org/issue?@action=redirect&bpo=33203]: random.Random.choice() now raises IndexError for empty sequences consistently even when called from subclasses without a getrandbits() implementation.

• bpo-33224 [https://bugs.python.org/issue?@action=redirect&bpo=33224]: Update difflib.mdiff() for PEP 479 [https://peps.python.org/pep-0479/]. Convert an uncaught StopIteration in a generator into a return-statement.

• bpo-33209 [https://bugs.python.org/issue?@action=redirect&bpo=33209]: End framing at the end of C implementation of pickle.Pickler.dump().

• bpo-32861 [https://bugs.python.org/issue?@action=redirect&bpo=32861]: The urllib.robotparser's __str__ representation now includes wildcard entries and the "Crawl-delay" and "Request-rate" fields. Also removes extra newlines that were being appended to the end of the string. Patch by Michael Lazar.

• bpo-23403 [https://bugs.python.org/issue?@action=redirect&bpo=23403]: DEFAULT_PROTOCOL in pickle was bumped to 4. Protocol 4 is described in PEP 3154 [https://peps.python.org/pep-3154/] and available since Python 3.4. It offers better performance and smaller size compared to protocol 3 introduced in Python 3.0.

• bpo-20104 [https://bugs.python.org/issue?@action=redirect&bpo=20104]: Improved error handling and fixed a reference leak in os.posix_spawn().

• bpo-33106 [https://bugs.python.org/issue?@action=redirect&bpo=33106]: Deleting a key from a readonly dbm database raises module specific error instead of KeyError.

• bpo-33175 [https://bugs.python.org/issue?@action=redirect&bpo=33175]: In dataclasses, Field.setname_ now looks up the _setname special method on the class, not the instance, of the default value.

• bpo-32380 [https://bugs.python.org/issue?@action=redirect&bpo=32380]: Create functools.singledispatchmethod to support generic single dispatch on descriptors and methods.

• bpo-33141 [https://bugs.python.org/issue?@action=redirect&bpo=33141]: Have Field objects pass through setname_ to their default values, if they have their own _setname.

• bpo-33096 [https://bugs.python.org/issue?@action=redirect&bpo=33096]: Allow ttk.Treeview.insert to insert iid that has a false boolean value. Note iid=0 and iid=False would be same. Patch by Garvit Khatri.

• bpo-32873 [https://bugs.python.org/issue?@action=redirect&bpo=32873]: Treat type variables and special typing forms as immutable by copy and pickle. This fixes several minor issues and inconsistencies, and improves backwards compatibility with Python 3.6.

• bpo-33134 [https://bugs.python.org/issue?@action=redirect&bpo=33134]: When computing dataclass's hash, use the lookup table to contain the function which returns the hash value. This is an improvement over looking up a string, and then testing that string to see what to do.

• bpo-33127 [https://bugs.python.org/issue?@action=redirect&bpo=33127]: The ssl module now compiles with LibreSSL 2.7.1.

• bpo-32505 [https://bugs.python.org/issue?@action=redirect&bpo=32505]: Raise TypeError if a member variable of a dataclass is of type Field, but doesn't have a type annotation.

• bpo-33078 [https://bugs.python.org/issue?@action=redirect&bpo=33078]: Fix the failure on OSX caused by the tests relying on sem_getvalue

• bpo-33116 [https://bugs.python.org/issue?@action=redirect&bpo=33116]: Add 'Field' to dataclasses.all.

• bpo-32896 [https://bugs.python.org/issue?@action=redirect&bpo=32896]: Fix an error where subclassing a dataclass with a field that uses a default_factory would generate an incorrect class.

• bpo-33100 [https://bugs.python.org/issue?@action=redirect&bpo=33100]: Dataclasses: If a field has a default value that's a MemberDescriptorType, then it's from that field being in slots, not an actual default value.

• bpo-32953 [https://bugs.python.org/issue?@action=redirect&bpo=32953]: If a non-dataclass inherits from a frozen dataclass, allow attributes to be added to the derived class. Only attributes from the frozen dataclass cannot be assigned to. Require all dataclasses in a hierarchy to be either all frozen or all non-frozen.

• bpo-33097 [https://bugs.python.org/issue?@action=redirect&bpo=33097]: Raise RuntimeError when executor.submit is called during interpreter shutdown.

• bpo-32968 [https://bugs.python.org/issue?@action=redirect&bpo=32968]: Modulo and floor division involving Fraction and float should return float.

• bpo-33061 [https://bugs.python.org/issue?@action=redirect&bpo=33061]: Add missing NoReturn to __all__ in typing.py

• bpo-33078 [https://bugs.python.org/issue?@action=redirect&bpo=33078]: Fix the size handling in multiprocessing.Queue when a pickling error occurs.

• bpo-33064 [https://bugs.python.org/issue?@action=redirect&bpo=33064]: lib2to3 now properly supports trailing commas after *args and **kwargs in function signatures.

• bpo-33056 [https://bugs.python.org/issue?@action=redirect&bpo=33056]: FIX properly close leaking fds in concurrent.futures.ProcessPoolExecutor.

• bpo-33021 [https://bugs.python.org/issue?@action=redirect&bpo=33021]: Release the GIL during fstat() calls, avoiding hang of all threads when calling mmap.mmap(), os.urandom(), and random.seed(). Patch by Nir Soffer.

• bpo-31804 [https://bugs.python.org/issue?@action=redirect&bpo=31804]: Avoid failing in multiprocessing.Process if the standard streams are closed or None at exit.

• bpo-33034 [https://bugs.python.org/issue?@action=redirect&bpo=33034]: Providing an explicit error message when casting the port property to anything that is not an integer value using urlparse() and urlsplit(). Patch by Matt Eaton.

• bpo-30249 [https://bugs.python.org/issue?@action=redirect&bpo=30249]: Improve struct.unpack_from() exception messages for problems with the buffer size and offset.

• bpo-33037 [https://bugs.python.org/issue?@action=redirect&bpo=33037]: Skip sending/receiving data after SSL transport closing.

• bpo-27683 [https://bugs.python.org/issue?@action=redirect&bpo=27683]: Fix a regression in ipaddress that result of hosts() is empty when the network is constructed by a tuple containing an integer mask and only 1 bit left for addresses.

• bpo-22674 [https://bugs.python.org/issue?@action=redirect&bpo=22674]: Add the strsignal() function in the signal module that returns the system description of the given signal, as returned by strsignal(3).

• bpo-32999 [https://bugs.python.org/issue?@action=redirect&bpo=32999]: Fix C implementation of ABC.__subclasscheck__(cls, subclass) crashed when subclass is not a type object.

• bpo-33009 [https://bugs.python.org/issue?@action=redirect&bpo=33009]: Fix inspect.signature() for single-parameter partialmethods.

• bpo-32969 [https://bugs.python.org/issue?@action=redirect&bpo=32969]: Expose several missing constants in zlib and fix corresponding documentation.

• bpo-32056 [https://bugs.python.org/issue?@action=redirect&bpo=32056]: Improved exceptions raised for invalid number of channels and sample width when read an audio file in modules aifc, wave and sunau.

• bpo-32970 [https://bugs.python.org/issue?@action=redirect&bpo=32970]: Improved disassembly of the MAKE_FUNCTION instruction.

• bpo-32844 [https://bugs.python.org/issue?@action=redirect&bpo=32844]: Fix wrong redirection of a low descriptor (0 or 1) to stderr in subprocess if another low descriptor is closed.

• bpo-32960 [https://bugs.python.org/issue?@action=redirect&bpo=32960]: For dataclasses, disallow inheriting frozen from non-frozen classes, and also disallow inheriting non-frozen from frozen classes. This restriction will be relaxed at a future date.

• bpo-32713 [https://bugs.python.org/issue?@action=redirect&bpo=32713]: Fixed tarfile.itn handling of out-of-bounds float values. Patch by Joffrey Fuhrer.

• bpo-32257 [https://bugs.python.org/issue?@action=redirect&bpo=32257]: The ssl module now contains OP_NO_RENEGOTIATION constant, available with OpenSSL 1.1.0h or 1.1.1.

• bpo-32951 [https://bugs.python.org/issue?@action=redirect&bpo=32951]: Direct instantiation of SSLSocket and SSLObject objects is now prohibited. The constructors were never documented, tested, or designed as public constructors. Users were suppose to use ssl.wrap_socket() or SSLContext.

• bpo-32929 [https://bugs.python.org/issue?@action=redirect&bpo=32929]: Remove the tri-state parameter "hash", and add the boolean "unsafehash". If unsafehash is True, add a hash function, but if a hash exists, raise TypeError. If unsafe_hash is False, add a __hash based on the values of eq= and frozen=. The unsafe_hash=False behavior is the same as the old hash=None behavior. unsafe_hash=False is the default, just as hash=None used to be.

• bpo-32947 [https://bugs.python.org/issue?@action=redirect&bpo=32947]: Add OP_ENABLE_MIDDLEBOX_COMPAT and test workaround for TLSv1.3 for future compatibility with OpenSSL 1.1.1.

• bpo-32146 [https://bugs.python.org/issue?@action=redirect&bpo=32146]: Document the interaction between frozen executables and the spawn and forkserver start methods in multiprocessing.

• bpo-30622 [https://bugs.python.org/issue?@action=redirect&bpo=30622]: The ssl module now detects missing NPN support in LibreSSL.

• bpo-32922 [https://bugs.python.org/issue?@action=redirect&bpo=32922]: dbm.open() now encodes filename with the filesystem encoding rather than default encoding.

• bpo-32759 [https://bugs.python.org/issue?@action=redirect&bpo=32759]: Free unused arenas in multiprocessing.heap.

• bpo-32859 [https://bugs.python.org/issue?@action=redirect&bpo=32859]: In os.dup2, don't check every call whether the dup3 syscall exists or not.

• bpo-32556 [https://bugs.python.org/issue?@action=redirect&bpo=32556]: nt._getfinalpathname, nt._getvolumepathname and nt._getdiskusage now correctly convert from bytes.

• bpo-21060 [https://bugs.python.org/issue?@action=redirect&bpo=21060]: Rewrite confusing message from setup.py upload from "No dist file created in earlier command" to the more helpful "Must create and upload files in one command".

• bpo-32857 [https://bugs.python.org/issue?@action=redirect&bpo=32857]: In tkinter, after_cancel(None) now raises a ValueError instead of canceling the first scheduled function. Patch by Cheryl Sabella.

• bpo-32852 [https://bugs.python.org/issue?@action=redirect&bpo=32852]: Make sure sys.argv remains as a list when running trace.

• bpo-31333 [https://bugs.python.org/issue?@action=redirect&bpo=31333]: _abc module is added. It is a speedup module with C implementations for various functions and methods in abc. Creating an ABC subclass and calling isinstance or issubclass with an ABC subclass are up to 1.5x faster. In addition, this makes Python startup up to 10% faster.

Note that the new implementation hides internal registry and caches, previously accessible via private attributes abcregistry, abccache, and abcnegative_cache. There are three debugging helper methods that can be used instead dumpregistry, abcregistry_clear, and abccaches_clear.

• bpo-32841 [https://bugs.python.org/issue?@action=redirect&bpo=32841]: Fixed asyncio.Condition issue which silently ignored cancellation after notifying and cancelling a conditional lock. Patch by Bar Harel.

• bpo-32819 [https://bugs.python.org/issue?@action=redirect&bpo=32819]: ssl.match_hostname() has been simplified and no longer depends on re and ipaddress module for wildcard and IP addresses. Error reporting for invalid wildcards has been improved.

• bpo-19675 [https://bugs.python.org/issue?@action=redirect&bpo=19675]: multiprocessing.Pool no longer leaks processes if its initialization fails.

• bpo-32394 [https://bugs.python.org/issue?@action=redirect&bpo=32394]: socket: Remove TCP_FASTOPEN,TCP_KEEPCNT,TCP_KEEPIDLE,TCP_KEEPINTVL flags on older version Windows during runtime.

• bpo-31787 [https://bugs.python.org/issue?@action=redirect&bpo=31787]: Fixed refleaks of __init__() methods in various modules. (Contributed by Oren Milman)

• bpo-30157 [https://bugs.python.org/issue?@action=redirect&bpo=30157]: Fixed guessing quote and delimiter in csv.Sniffer.sniff() when only the last field is quoted. Patch by Jake Davis.

• bpo-30688 [https://bugs.python.org/issue?@action=redirect&bpo=30688]: Added support of \N{name} escapes in regular expressions. Based on patch by Jonathan Eunice.

• bpo-32792 [https://bugs.python.org/issue?@action=redirect&bpo=32792]: collections.ChainMap() preserves the order of the underlying mappings.

• bpo-32775 [https://bugs.python.org/issue?@action=redirect&bpo=32775]: fnmatch.translate() no longer produces patterns which contain set operations. Sets starting with '[' or containing '—', '&&', '~~' or '||' will be interpreted differently in regular expressions in future versions. Currently they emit warnings. fnmatch.translate() now avoids producing patterns containing such sets by accident.

• bpo-32622 [https://bugs.python.org/issue?@action=redirect&bpo=32622]: Implement native fast sendfile for Windows proactor event loop.

• bpo-32777 [https://bugs.python.org/issue?@action=redirect&bpo=32777]: Fix a rare but potential preexec child process deadlock in subprocess on POSIX systems when marking file descriptors inheritable on exec in the child process. This bug appears to have been introduced in 3.4.

• bpo-32647 [https://bugs.python.org/issue?@action=redirect&bpo=32647]: The ctypes module used to depend on indirect linking for dlopen. The shared extension is now explicitly linked against libdl on platforms with dl.

• bpo-32749 [https://bugs.python.org/issue?@action=redirect&bpo=32749]: A dbm.dumb database opened with flags 'r' is now readonly. dbm.dumb.open() with flags 'r' and 'w' no longer creates a database if it does not exist.

• bpo-32741 [https://bugs.python.org/issue?@action=redirect&bpo=32741]: Implement asyncio.TimerHandle.when() method.

• bpo-32691 [https://bugs.python.org/issue?@action=redirect&bpo=32691]: Use mod_spec.parent when running modules with pdb

• bpo-32734 [https://bugs.python.org/issue?@action=redirect&bpo=32734]: Fixed asyncio.Lock() safety issue which allowed acquiring and locking the same lock multiple times, without it being free. Patch by Bar Harel.

• bpo-32727 [https://bugs.python.org/issue?@action=redirect&bpo=32727]: Do not include name field in SMTP envelope from address. Patch by Stéphane Wirtel

• bpo-31453 [https://bugs.python.org/issue?@action=redirect&bpo=31453]: Add TLSVersion constants and SSLContext.maximum_version / minimum_version attributes. The new API wraps OpenSSL 1.1 https://web.archive.org/web/20180309043602/https://www.openssl.org/docs/man1.1.0/ssl/SSL_CTXsetminprotoversion.html feature.

• bpo-24334 [https://bugs.python.org/issue?@action=redirect&bpo=24334]: Internal implementation details of ssl module were cleaned up. The SSLSocket has one less layer of indirection. Owner and session information are now handled by the SSLSocket and SSLObject constructor. Channel binding implementation has been simplified.

• bpo-31848 [https://bugs.python.org/issue?@action=redirect&bpo=31848]: Fix the error handling in Aifc_read.initfp() when the SSND chunk is not found. Patch by Zackery Spytz.

• bpo-32585 [https://bugs.python.org/issue?@action=redirect&bpo=32585]: Add Ttk spinbox widget to tkinter.ttk. Patch by Alan D Moore.

• bpo-32512 [https://bugs.python.org/issue?@action=redirect&bpo=32512]: profile CLI accepts -m module_name as an alternative to script path.

• bpo-8525 [https://bugs.python.org/issue?@action=redirect&bpo=8525]: help() on a type now displays builtin subclasses. This is intended primarily to help with notification of more specific exception subclasses.

Patch by Sanyam Khurana.

• bpo-31639 [https://bugs.python.org/issue?@action=redirect&bpo=31639]: http.server now exposes a ThreadingHTTPServer class and uses it when the module is run with -m to cope with web browsers pre-opening sockets.

• bpo-29877 [https://bugs.python.org/issue?@action=redirect&bpo=29877]: compileall: import ProcessPoolExecutor only when needed, preventing hangs on low resource platforms

• bpo-32221 [https://bugs.python.org/issue?@action=redirect&bpo=32221]: Various functions returning tuple containing IPv6 addresses now omit %scope part since the same information is already encoded in scopeid tuple item. Especially this speeds up socket.recvfrom() when it receives multicast packet since useless resolving of network interface name is omitted.

• bpo-32147 [https://bugs.python.org/issue?@action=redirect&bpo=32147]: binascii.unhexlify() is now up to 2 times faster. Patch by Sergey Fedoseev.

• bpo-30693 [https://bugs.python.org/issue?@action=redirect&bpo=30693]: The TarFile class now recurses directories in a reproducible way.

• bpo-30693 [https://bugs.python.org/issue?@action=redirect&bpo=30693]: The ZipFile class now recurses directories in a reproducible way.

• bpo-31680 [https://bugs.python.org/issue?@action=redirect&bpo=31680]: Added curses.ncurses_version.

• bpo-31908 [https://bugs.python.org/issue?@action=redirect&bpo=31908]: Fix output of cover files for trace module commandline tool. Previously emitted cover files only when --missing option was used. Patch by Michael Selik.

• bpo-31608 [https://bugs.python.org/issue?@action=redirect&bpo=31608]: Raise a TypeError instead of crashing if a collections.deque subclass returns a non-deque from _new_. Patch by Oren Milman.

• bpo-31425 [https://bugs.python.org/issue?@action=redirect&bpo=31425]: Add support for sockets of the AF_QIPCRTR address family, supported by the Linux kernel. This is used to communicate with services, such as GPS or radio, running on Qualcomm devices. Patch by Bjorn Andersson.

• bpo-22005 [https://bugs.python.org/issue?@action=redirect&bpo=22005]: Implemented unpickling instances of datetime, date and time pickled by Python 2. encoding='latin1' should be used for successful decoding.

• bpo-27645 [https://bugs.python.org/issue?@action=redirect&bpo=27645]: sqlite3.Connection now exposes a backup method, if the underlying SQLite library is at version 3.6.11 or higher. Patch by Lele Gaifax.

• bpo-16865 [https://bugs.python.org/issue?@action=redirect&bpo=16865]: Support arrays >=2GiB in ctypes. Patch by Segev Finer.

• bpo-31508 [https://bugs.python.org/issue?@action=redirect&bpo=31508]: Removed support of arguments in tkinter.ttk.Treeview.selection. It was deprecated in 3.6. Use specialized methods like selection_set for changing the selection.

• bpo-29456 [https://bugs.python.org/issue?@action=redirect&bpo=29456]: Fix bugs in hangul normalization: u1176, u11a7 and u11c3