3.8.0a3 - Cpython — ContextQMD

.. bpo: 36216 .. date: 2019-03-06-09-38-40 .. nonce: 6q1m4a .. release date: 2019-03-25 .. section: Security

Changes urlsplit() to raise ValueError when the URL contains characters that decompose under IDNA encoding (NFKC-normalization) into characters that affect how the URL is parsed.

.. bpo: 35121 .. date: 2018-10-31-15-39-17 .. nonce: EgHv9k .. section: Security

Don't send cookies of domain A without Domain attribute to domain B when domain A is a suffix match of domain B while using a cookiejar with :class:http.cookiejar.DefaultCookiePolicy policy. Patch by Karthikeyan Singaravelan.

.. bpo: 36421 .. date: 2019-03-24-21-33-22 .. nonce: gJ2Pv9 .. section: Core and Builtins

Fix a possible double decref in _ctypes.c's PyCArrayType_new().

.. bpo: 36412 .. date: 2019-03-23-19-51-09 .. nonce: C7acGn .. section: Core and Builtins

Fix a possible crash when creating a new dictionary.

.. bpo: 36398 .. date: 2019-03-21-22-19-38 .. nonce: B_jXGe .. section: Core and Builtins

Fix a possible crash in structseq_repr().

.. bpo: 36256 .. date: 2019-03-21-00-24-18 .. nonce: OZHa0t .. section: Core and Builtins

Fix bug in parsermodule when parsing a state in a DFA that has two or more arcs with labels of the same type. Patch by Pablo Galindo.

.. bpo: 36365 .. date: 2019-03-19-15-58-23 .. nonce: jHaErz .. section: Core and Builtins

repr(structseq) is no longer limited to 512 bytes.

.. bpo: 36374 .. date: 2019-03-19-15-46-42 .. nonce: EWKMZE .. section: Core and Builtins

Fix a possible null pointer dereference in merge_consts_recursive(). Patch by Zackery Spytz.

.. bpo: 36236 .. date: 2019-03-19-03-08-26 .. nonce: 5qN9qK .. section: Core and Builtins

At Python initialization, the current directory is no longer prepended to :data:sys.path if it has been removed.

.. bpo: 36352 .. date: 2019-03-19-02-36-40 .. nonce: qj2trz .. section: Core and Builtins

Python initialization now fails with an error, rather than silently truncating paths, if a path is too long.

.. bpo: 36301 .. date: 2019-03-19-00-54-31 .. nonce: xvOCJb .. section: Core and Builtins

Python initialization now fails if decoding pybuilddir.txt configuration file fails at startup.

.. bpo: 36333 .. date: 2019-03-18-10-56-53 .. nonce: 4dqemZ .. section: Core and Builtins

Fix leak in _PyRuntimeState_Fini. Contributed by Stéphane Wirtel.

.. bpo: 36332 .. date: 2019-03-18-09-27-54 .. nonce: yEC-Vz .. section: Core and Builtins

The builtin :func:compile can now handle AST objects that contain assignment expressions. Patch by Pablo Galindo.

.. bpo: 36282 .. date: 2019-03-13-22-47-28 .. nonce: zs7RKP .. section: Core and Builtins

Improved error message for too much positional arguments in some builtin functions.

.. bpo: 30040 .. date: 2019-03-11-22-30-56 .. nonce: W9z8X7 .. section: Core and Builtins

New empty dict uses fewer memory for now. It used more memory than empty dict created by dict.clear(). And empty dict creation and deletion is about 2x faster. Patch by Inada Naoki.

.. bpo: 36262 .. date: 2019-03-11-15-37-33 .. nonce: v3N6Fz .. section: Core and Builtins

Fix an unlikely memory leak on conversion from string to float in the function _Py_dg_strtod() used by float(str), complex(str), :func:pickle.load, :func:marshal.load, etc.

.. bpo: 36252 .. date: 2019-03-09-15-47-05 .. nonce: sCQFKq .. section: Core and Builtins

Update Unicode databases to version 12.0.0.

.. bpo: 36218 .. date: 2019-03-07-13-05-43 .. nonce: dZemNt .. section: Core and Builtins

Fix a segfault occurring when sorting a list of heterogeneous values. Patch contributed by Rémi Lapeyre and Elliot Gorokhovsky.

.. bpo: 36188 .. date: 2019-03-04-18-05-31 .. nonce: EuUZNz .. section: Core and Builtins

Cleaned up left-over vestiges of Python 2 unbound method handling in method objects and documentation. Patch by Martijn Pieters

.. bpo: 36124 .. date: 2019-03-01-13-48-01 .. nonce: Blzxq1 .. section: Core and Builtins

Add a new interpreter-specific dict and expose it in the C-API via PyInterpreterState_GetDict(). This parallels PyThreadState_GetDict(). However, extension modules should continue using PyModule_GetState() for their own internal per-interpreter state.

.. bpo: 35975 .. date: 2019-02-27-16-49-08 .. nonce: IescLY .. section: Core and Builtins

Add a feature_version flag to ast.parse() (documented) and compile() (hidden) that allows tweaking the parser to support older versions of the grammar. In particular, if feature_version is 5 or 6, the hacks for the async and await keyword from PEP 492 are reinstated. (For 7 or higher, these are unconditionally treated as keywords, but they are still special tokens rather than NAME tokens that the parser driver recognizes.)

.. bpo: 31904 .. date: 2019-02-26-17-34-49 .. nonce: R4KSj6 .. section: Core and Builtins

Use UTF-8 as the system encoding on VxWorks.

.. bpo: 36048 .. date: 2019-02-20-08-51-04 .. nonce: I3LJt9 .. section: Core and Builtins

The :meth:~object.__index__ special method will be used instead of :meth:~object.__int__ for implicit conversion of Python numbers to C integers. Using the __int__() method in implicit conversions has been deprecated.

.. bpo: 35808 .. date: 2019-02-11-00-50-03 .. nonce: M12CMH .. section: Core and Builtins

Retire pgen and use a modified version of pgen2 to generate the parser. Patch by Pablo Galindo.

.. bpo: 36401 .. date: 2019-03-23-10-25-07 .. nonce: hYpVBS .. section: Library

The class documentation created by pydoc now has a separate section for readonly properties.

.. bpo: 36320 .. date: 2019-03-18-01-08-14 .. nonce: -06b9_ .. section: Library

The typing.NamedTuple() class has deprecated the _field_types attribute in favor of the annotations attribute which carried the same information. Also, both attributes were converted from OrderedDict to a regular dict.

.. bpo: 34745 .. date: 2019-03-17-16-43-29 .. nonce: nOfm7_ .. section: Library

Fix :mod:asyncio ssl memory issues caused by circular references

.. bpo: 36324 .. date: 2019-03-17-01-17-45 .. nonce: dvNrRe .. section: Library

Add method to statistics.NormalDist for computing the inverse cumulative normal distribution.

.. bpo: 36321 .. date: 2019-03-16-13-40-59 .. nonce: s6crQx .. section: Library

collections.namedtuple() misspelled the name of an attribute. To be consistent with typing.NamedTuple, the attribute name should have been "_field_defaults" instead of "_fields_defaults". For backwards compatibility, both spellings are now created. The misspelled version may be removed in the future.

.. bpo: 36297 .. date: 2019-03-15-21-41-22 .. nonce: Gz9ZfU .. section: Library

"unicode_internal" codec is removed. It was deprecated since Python 3.3. Patch by Inada Naoki.

.. bpo: 36298 .. date: 2019-03-15-13-54-07 .. nonce: amEVK2 .. section: Library

Raise ModuleNotFoundError in pyclbr when a module can't be found. Thanks to 'mental' for the bug report.

.. bpo: 36268 .. date: 2019-03-14-16-25-17 .. nonce: MDXLw6 .. section: Library

Switch the default format used for writing tars with :mod:tarfile to the modern POSIX.1-2001 pax standard, from the vendor-specific GNU. Contributed by C.A.M. Gerlach.

.. bpo: 36285 .. date: 2019-03-14-01-09-59 .. nonce: G-usj8 .. section: Library

Fix integer overflows in the array module. Patch by Stephan Hohe.

.. bpo: 31904 .. date: 2019-03-13-14-55-02 .. nonce: 834kfY .. section: Library

Add _signal module support for VxWorks.

.. bpo: 36272 .. date: 2019-03-13-14-14-36 .. nonce: f3l2IG .. section: Library

:mod:logging does not silently ignore RecursionError anymore. Patch contributed by Rémi Lapeyre.

.. bpo: 36280 .. date: 2019-03-12-21-02-55 .. nonce: mOd3iH .. section: Library

Add a kind field to ast.Constant. It is 'u' if the literal has a 'u' prefix (i.e. a Python 2 style unicode literal), else None.

.. bpo: 35931 .. date: 2019-03-11-22-06-36 .. nonce: Qp_Tbe .. section: Library

The :mod:pdb debug command now gracefully handles all exceptions.

.. bpo: 36251 .. date: 2019-03-09-18-01-24 .. nonce: zOp9l0 .. section: Library

Fix format strings used for stderrprinter and re.Match reprs. Patch by Stephan Hohe.

.. bpo: 36235 .. date: 2019-03-08-13-32-21 .. nonce: _M72wU .. section: Library

Fix CFLAGS in customize_compiler() of distutils.sysconfig: when the CFLAGS environment variable is defined, don't override CFLAGS variable with the OPT variable anymore. Initial patch written by David Malcolm.

.. bpo: 35807 .. date: 2019-03-06-13-21-33 .. nonce: W7mmu3 .. section: Library

Update ensurepip to install pip 19.0.3 and setuptools 40.8.0.

.. bpo: 36139 .. date: 2019-03-06-13-07-29 .. nonce: 6kedum .. section: Library

Release GIL when closing :class:~mmap.mmap objects.

.. bpo: 36179 .. date: 2019-03-04-10-42-46 .. nonce: jEyuI- .. section: Library

Fix two unlikely reference leaks in _hashopenssl. The leaks only occur in out-of-memory cases.

.. bpo: 36169 .. date: 2019-03-03-11-37-09 .. nonce: 8nWJy7 .. section: Library

Add overlap() method to statistics.NormalDist. Computes the overlapping coefficient for two normal distributions.

.. bpo: 36103 .. date: 2019-03-01-16-10-01 .. nonce: n6VgXL .. section: Library

Default buffer size used by shutil.copyfileobj() is changed from 16 KiB to 64 KiB on non-Windows platform to reduce system call overhead. Contributed by Inada Naoki.

.. bpo: 36130 .. date: 2019-02-26-22-41-38 .. nonce: _BnZOo .. section: Library

Fix pdb with skip=... when stepping into a frame without a __name__ global. Patch by Anthony Sottile.

.. bpo: 35652 .. date: 2019-02-26-11-34-44 .. nonce: 6KRJu_ .. section: Library

shutil.copytree(copy_function=...) erroneously pass DirEntry instead of a path string.

.. bpo: 35178 .. date: 2019-02-25-23-04-00 .. nonce: NA_rXa .. section: Library

Ensure custom :func:warnings.formatwarning function can receive line as positional argument. Based on patch by Tashrif Billah.

.. bpo: 36106 .. date: 2019-02-25-13-21-43 .. nonce: VuhEiQ .. section: Library

Resolve potential name clash with libm's sinpi(). Patch by Dmitrii Pasechnik.

.. bpo: 36091 .. date: 2019-02-23-06-49-06 .. nonce: 26o4Lc .. section: Library

Clean up reference to async generator in Lib/types. Patch by Henry Chen.

.. bpo: 36043 .. date: 2019-02-19-19-53-46 .. nonce: l867v0 .. section: Library

:class:FileCookieJar supports :term:path-like object. Contributed by Stéphane Wirtel

.. bpo: 35899 .. date: 2019-02-16-07-11-02 .. nonce: cjfn5a .. section: Library

Enum has been fixed to correctly handle empty strings and strings with non-Latin characters (ie. 'α', 'א') without crashing. Original patch contributed by Maxwell. Assisted by Stéphane Wirtel.

.. bpo: 21269 .. date: 2019-02-10-16-49-16 .. nonce: Fqi7VH .. section: Library

Add args and kwargs properties to mock call objects. Contributed by Kumar Akshay.

.. bpo: 30670 .. date: 2019-02-06-12-07-46 .. nonce: yffB3F .. section: Library

pprint.pp has been added to pretty-print objects with dictionary keys being sorted with their insertion order by default. Parameter sort_dicts has been added to pprint.pprint, pprint.pformat and pprint.PrettyPrinter. Contributed by Rémi Lapeyre.

.. bpo: 35843 .. date: 2019-01-28-10-19-40 .. nonce: 7rXGQE .. section: Library

Implement __getitem__ for _NamespacePath. Patch by Anthony Sottile.

.. bpo: 35802 .. date: 2019-01-21-13-56-55 .. nonce: 6633PE .. section: Library

Clean up code which checked presence of os.stat / os.lstat / os.chmod which are always present. Patch by Anthony Sottile.

.. bpo: 35715 .. date: 2019-01-11-08-47-58 .. nonce: Wi3gl0 .. section: Library

Librates the return value of a ProcessPoolExecutor _process_worker after it's no longer needed to free memory

.. bpo: 35493 .. date: 2019-01-09-23-43-08 .. nonce: kEcRGE .. section: Library

Use :func:multiprocessing.connection.wait instead of polling each 0.2 seconds for worker updates in :class:multiprocessing.Pool. Patch by Pablo Galindo.

.. bpo: 35661 .. date: 2019-01-05-16-16-20 .. nonce: H_UOXc .. section: Library

Store the venv prompt in pyvenv.cfg.

.. bpo: 35121 .. date: 2018-12-30-14-35-19 .. nonce: oWmiGU .. section: Library

Don't set cookie for a request when the request path is a prefix match of the cookie's path attribute but doesn't end with "/". Patch by Karthikeyan Singaravelan.

.. bpo: 21478 .. date: 2018-12-21-09-54-30 .. nonce: 5gsXtc .. section: Library

Calls to a child function created with :func:unittest.mock.create_autospec should propagate to the parent. Patch by Karthikeyan Singaravelan.

.. bpo: 35198 .. date: 2018-11-09-12-45-28 .. nonce: EJ8keW .. section: Library

Fix C++ extension compilation on AIX

.. bpo: 36329 .. date: 2019-03-17-20-01-41 .. nonce: L5dJPD .. section: Documentation

Declare the path of the Python binary for the usage of Tools/scripts/serve.py when executing make -C Doc/ serve. Contributed by Stéphane Wirtel

.. bpo: 36138 .. date: 2019-03-02-00-40-57 .. nonce: yfjNzG .. section: Documentation

Improve documentation about converting datetime.timedelta to scalars.

.. bpo: 21314 .. date: 2018-11-21-23-01-37 .. nonce: PG33VT .. section: Documentation

A new entry was added to the Core Language Section of the Programming FAQ, which explaines the usage of slash(/) in the signature of a function. Patch by Lysandros Nikolaou

.. bpo: 36234 .. date: 2019-03-08-12-53-37 .. nonce: NRVK6W .. section: Tests

test_posix.PosixUidGidTests: add tests for invalid uid/gid type (str). Initial patch written by David Malcolm.

.. bpo: 29571 .. date: 2019-02-28-18-33-29 .. nonce: r6b9fr .. section: Tests

Fix test_re.test_locale_flag(): use locale.getpreferredencoding() rather than locale.getlocale() to get the locale encoding. With some locales, locale.getlocale() returns the wrong encoding.

.. bpo: 36123 .. date: 2019-02-26-12-51-35 .. nonce: QRhhRS .. section: Tests

Fix race condition in test_socket.

.. bpo: 36356 .. date: 2019-03-18-23-49-15 .. nonce: WNrwYI .. section: Build

Fix leaks that led to build failure when configured with address sanitizer.

.. bpo: 36146 .. date: 2019-03-01-17-49-22 .. nonce: VeoyG7 .. section: Build

Add TEST_EXTENSIONS constant to setup.py to allow to not build test extensions like _testcapi.

.. bpo: 36146 .. date: 2019-02-28-18-09-01 .. nonce: IwPJVT .. section: Build

Fix setup.py on macOS: only add /usr/include/ffi to include directories of _ctypes, not for all extensions.

.. bpo: 31904 .. date: 2019-02-21-14-48-31 .. nonce: J82jY2 .. section: Build

Enable build system to cross-build for VxWorks RTOS.

.. bpo: 36312 .. date: 2019-03-16-16-51-17 .. nonce: Niwm-T .. section: Windows

Fixed decoders for the following code pages: 50220, 50221, 50222, 50225, 50227, 50229, 57002 through 57011, 65000 and 42.

.. bpo: 36264 .. date: 2019-03-11-09-33-47 .. nonce: rTzWce .. section: Windows

Don't honor POSIX HOME in os.path.expanduser on windows. Patch by Anthony Sottile.

.. bpo: 24643 .. date: 2019-02-24-07-52-39 .. nonce: PofyiS .. section: Windows

Fix name collisions due to #define timezone _timezone in PC/pyconfig.h.

.. bpo: 36405 .. date: 2019-03-23-01-45-56 .. nonce: m7Wv1F .. section: IDLE

Use dict unpacking in idlelib.

.. bpo: 36396 .. date: 2019-03-21-22-43-21 .. nonce: xSTX-I .. section: IDLE

Remove fgBg param of idlelib.config.GetHighlight(). This param was only used twice and changed the return type.

.. bpo: 36176 .. date: 2019-03-10-00-07-46 .. nonce: jk_vv6 .. section: IDLE

Fix IDLE autocomplete & calltip popup colors. Prevent conflicts with Linux dark themes (and slightly darken calltip background).

.. bpo: 23205 .. date: 2019-03-06-14-47-57 .. nonce: Vv0gfH .. section: IDLE

For the grep module, add tests for findfiles, refactor findfiles to be a module-level function, and refactor findfiles to use os.walk.

.. bpo: 23216 .. date: 2019-03-02-19-39-53 .. nonce: ZA7H8H .. section: IDLE

Add docstrings to IDLE search modules.

.. bpo: 36152 .. date: 2019-02-28-18-52-40 .. nonce: 9pkHIU .. section: IDLE

Remove colorizer.ColorDelegator.close_when_done and the corresponding argument of .close(). In IDLE, both have always been None or False since 2007.

.. bpo: 32129 .. date: 2019-02-25-11-40-14 .. nonce: 4qVCzD .. section: IDLE

Avoid blurry IDLE application icon on macOS with Tk 8.6. Patch by Kevin Walzer.

.. bpo: 36096 .. date: 2019-02-23-17-53-53 .. nonce: mN5Ly3 .. section: IDLE

Refactor class variables to instance variables in colorizer.

.. bpo: 30348 .. date: 2018-06-27-21-18-41 .. nonce: WbaRJW .. section: IDLE

Increase test coverage of idlelib.autocomplete by 30%. Patch by Louie Lu

.. bpo: 35132 .. date: 2019-03-04-02-09-09 .. nonce: 1R_pnL .. section: Tools/Demos

Fix py-list and py-bt commands of python-gdb.py on gdb7.

.. bpo: 32217 .. date: 2017-12-19-20-42-36 .. nonce: axXcjA .. section: Tools/Demos

Fix freeze script on Windows.

.. bpo: 36381 .. date: 2019-03-20-22-02-40 .. nonce: xlzDJ2 .. section: C API

Raise DeprecationWarning when '#' formats are used for building or parsing values without PY_SSIZE_T_CLEAN.

.. bpo: 36142 .. date: 2019-03-01-03-23-48 .. nonce: 7F6wJd .. section: C API

The whole coreconfig.h header is now excluded from Py_LIMITED_API. Move functions definitions into a new internal pycore_coreconfig.h header.